Patent Publication Number: US-2023156115-A1

Title: Electronic device and method for reducing current consumption in electronic device connected with communication network

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of International Application No. PCT/KR2022/017778 designating the United States, filed on Nov. 11, 2022, in the Korean Intellectual Property Receiving Office and claiming priority to Korean Patent Application No. 10-2021-0155948, filed on Nov. 12, 2021, in the Korean Intellectual Property Office, the disclosures of all of which are incorporated by reference herein in their entireties. 
    
    
     BACKGROUND 
     Field 
     The disclosure relates to an electronic device and a method for reducing current consumption in an electronic device connected with a communication network. 
     Description of Related Art 
     As mobile communication technology evolves, multi-functional portable terminals are commonplace and, to meet increasing demand for radio traffic, vigorous efforts are underway to develop 5G communication systems. To achieve a higher data transmission rate, 5G communication systems are being implemented on higher frequency bands (e.g., a band of 25 GHz to 60 GHz), as well as those used for 3G communication systems and long-term evolution (LTE) communication systems. 
     To mitigate pathloss on the mmWave band and increase the reach of radio waves, the following techniques are taken into account for the 5G communication system: beamforming, massive multi-input multi-output (MIMO), full dimensional MIMO (FD-MIMO), array antenna, analog beamforming, and large scale antenna. 
     To implement 5G communication, stand-alone (SA) and non-stand alone (NSA) schemes are taken into consideration. The SA scheme may refer, for example, to a scheme that uses only the new radio (NR) system (or 5G system), and the NSA scheme may refer, for example, to a scheme that uses the NR system together with the legacy LTE system. In the NSA scheme, user equipment (UE) may use not only eNBs of the LTE system but also gNBs of the NR system. Technology allowing UEs to use heterogeneous communication systems may be referred to, for example, as dual connectivity. 
     SUMMARY 
     Embodiments of the disclosure provide that, when an electronic device is connected through dual-connectivity of EN-DC, a call may be connected through voice over LTE (VoLTE) on an LTE network because a master cell group (MCG) is an LTE system. When the electronic device is connected to the 5G system with the SA scheme, a call may be connected through voice over NR (VoNR) on the 5G network. Even if the electronic device is connected to the 5G network, if the electronic device or the 5G network does not support VoNR, the call may be connected by switching to VoLTE by evolved packet system (EPS) fallback technology. 
     For example, even when the electronic device is connected to the NR network through the SA scheme, if switching to VoLTE by EPS fallback technology upon call connection, call connection may take a relatively long time. As the electronic device and the NR network support VoNR, if the electronic device connects through VoNR upon call connection, the electronic device may consume relatively high current (or power) as compared with VoLTE, due to the technical features of high processing or broad bandwidth of the 5G communication system and may increase in temperature. If EPS fallback is performed to provide a service although the electronic device is capable of VoNR connection considering current consumption and heat generation, call connection may take a long time, and the electronic device may fail to receive the high-quality service of VoNR or specified functions of VoNR. 
     Embodiments of the disclosure may provide an electronic device and a method for reducing current consumption in an electronic device connected with a communication network, which may reduce current consumption while a VoNR call is connected. 
     Embodiments of the disclosure may provide an electronic device and a method for reducing current consumption in an electronic device connected with a communication network, which may ensure call quality by controlling not to perform an operation corresponding to an overheat state although the electronic device is in the overheat state in a VoNR call-connected state. 
     Embodiments of the disclosure may provide an electronic device and a method for reducing current consumption in an electronic device connected with a communication network, which may disable VoNR considering the bandwidth part (BWP) or bandwidth while the electronic device accesses a 5G network and registers VoNR. 
     According to various embodiments, an electronic device may comprise a plurality of antennas and at least one communication processor may be configured to communicate with a first communication network or a second communication network through the plurality of antennas. The at least one communication processor may be configured to set up a call with an external electronic device through the first communication network, identify information related to call quality in a call connected state with the external electronic device, and perform an operation for reducing a number of antennas for reception among the plurality of antennas based on identifying that the information related to the call quality meets a designated condition. 
     According to various embodiments, a method for reducing current consumption in an electronic device communicating with a first communication network or a second communication network through a plurality of antennas may comprise allowing the electronic device to set up a call with an external electronic device through the first communication network, allowing the electronic device to identify information related to call quality in a call connected state with the external electronic device, and reducing a number of antennas for reception among the plurality of antennas based on identifying that the information related to the call quality meets a designated condition. 
     According to various embodiments, an electronic device may comprise a plurality of antennas and at least one communication processor communicating with a first communication network or a second communication network through the plurality of antennas. The at least one communication processor may be configured to register voice over new radio (VoNR) through the first communication network, identify information related to a set bandwidth or bandwidth part (BWP) from the first communication network, and perform at least one operation for disabling the VoNR based on identifying that the information related to the bandwidth or the bandwidth part meets a designated condition. 
     According to various embodiments, current consumption can be reduced by reducing the number of antennas for reception when call quality is ensured in a VoNR call-connected state of the electronic device. 
     According to various embodiments, in the overheat state of the electronic device, current consumption may be reduced by performing an operation corresponding to the overheat state and, in the VoNR call-connected state, the operation corresponding to the overheat state is controlled not to be performed despite the overheat state. Thus, call quality may be ensured. 
     According to various embodiments, it is possible to disable VoNR considering the bandwidth or bandwidth part (BWP) in the state in which the electronic device accesses the 5G network and registers VoNR, thereby connecting to VoLTE by EPS fallback upon call connection and thus reducing current consumption. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other aspects, features and advantages of certain embodiments of the present disclosure will be more apparent from the following detailed description, taken in conjunction with the accompanying drawings, in which: 
         FIG.  1    is a block diagram illustrating an example electronic device in a network environment according to various embodiments; 
         FIG.  2 A  is a block diagram illustrating an example electronic device for supporting legacy network communication and 5G network communication according to various embodiments; 
         FIG.  2 B  is a block diagram illustrating an example electronic device for supporting legacy network communication and 5G network communication according to various embodiments; 
         FIG.  3 A  illustrates example wireless communication systems providing a legacy communication network and/or a 5G communication network according to various embodiments; 
         FIG.  3 B  illustrates example wireless communication systems providing a legacy communication network and/or a 5G communication network according to various embodiments; 
         FIG.  3 C  illustrates example wireless communication systems providing a legacy communication network and/or a 5G communication network according to various embodiments; 
         FIG.  4    is a block diagram illustrating an example electronic device according to various embodiments; 
         FIG.  5    is a flowchart illustrating an example operation for connecting to a communication network by an electronic device according to various embodiments; 
         FIG.  6    is a flowchart illustrating an example operation for connecting to a communication network by an electronic device according to various embodiments; 
         FIG.  7    is a flowchart illustrating example operations of an electronic device according to various embodiments; 
         FIG.  8    is a view illustrating transmission of a reference signal by an example electronic device according to various embodiments; 
         FIG.  9    is a view illustrating transmission of a reference signal by an example electronic device according to various embodiments; 
         FIG.  10    is a flowchart illustrating an example signal transmission/reception procedure between an electronic device and a communication network according to various embodiments; 
         FIG.  11    is a view illustrating an example transmission period of a reference signal according to various embodiments; 
         FIG.  12    is a view illustrating a concept of transmission of a reference signal by an example electronic device according to various embodiments; 
         FIG.  13    is a block diagram illustrating an example electronic device according to various embodiments; 
         FIG.  14 A  is a flowchart illustrating example operations of an electronic device according to various embodiments; 
         FIG.  14 B  is a flowchart illustrating example operations of an electronic device according to various embodiments; 
         FIG.  15    illustrates a concept of a grant ratio allocated to an example electronic device according to various embodiments; 
         FIG.  16    is a flowchart illustrating operations of an example electronic device according to various embodiments; 
         FIG.  17    is a flowchart illustrating operations of an example electronic device according to various embodiments; 
         FIG.  18    is a flowchart illustrating operations of an example electronic device according to various embodiments; 
         FIG.  19    is a flowchart illustrating operations of an example electronic device according to various embodiments; 
         FIG.  20    is a flowchart illustrating operations of an example electronic device according to various embodiments; 
         FIG.  21    is a flowchart illustrating operations of an example electronic device according to various embodiments; 
         FIG.  22    is a flowchart illustrating operations of an example electronic device according to various embodiments; 
         FIG.  23    is a flowchart illustrating operations of an example electronic device according to various embodiments; 
         FIG.  24    is a flowchart illustrating operations of an example electronic device according to various embodiments; 
         FIG.  25    is a flowchart illustrating operations of an example electronic device according to various embodiments; 
         FIG.  26    is a flowchart illustrating operations of an example electronic device according to various embodiments; 
         FIG.  27    is a flowchart illustrating operations of an example electronic device according to various embodiments; and 
         FIG.  28    is a flowchart illustrating operations of an example electronic device according to various embodiments. 
     
    
    
     DETAILED DESCRIPTION 
       FIG.  1    is a block diagram illustrating an electronic device  101  in a network environment  100  according to various embodiments. Referring to  FIG.  1   , the electronic device  101  in the network environment  100  may communicate with an electronic device  102  via a first network  198  (e.g., a short-range wireless communication network), or an electronic device  104  or a server  108  via a second network  199  (e.g., a long-range wireless communication network). According to an embodiment, the electronic device  101  may communicate with the electronic device  104  via the server  108 . According to an embodiment, the electronic device  101  may include a processor  120 , memory  130 , an input module  150 , a sound output module  155 , a display module  160 , an audio module  170 , a sensor module  176 , an interface  177 , a connection terminal  178 , a haptic module  179 , a camera module  180 , a power management module  188 , a battery  189 , a communication module  190 , a subscriber identification module (SIM)  196 , or an antenna module  197 . In various embodiments, at least one (e.g., the connection terminal  178 ) of the components may be omitted from the electronic device  101 , or one or more other components may be added in the electronic device  101 . According to an embodiment, some (e.g., the sensor module  176 , the camera module  180 , or the antenna module  197 ) of the components may be integrated into a single component (e.g., the display module  160 ). 
     The processor  120  may execute, for example, software (e.g., a program  140 ) to control at least one other component (e.g., a hardware or software component) of the electronic device  101  coupled with the processor  120 , and may perform various data processing or computation. According to an embodiment, as at least part of the data processing or computation, the processor  120  may store a command or data received from another component (e.g., the sensor module  176  or the communication module  190 ) in volatile memory  132 , process the command or the data stored in the volatile memory  132 , and store resulting data in non-volatile memory  134 . According to an embodiment, the processor  120  may include a main processor  121  (e.g., a central processing unit (CPU) or an application processor (AP)), or an auxiliary processor  123  (e.g., a graphics processing unit (GPU), a neural processing unit (NPU), an image signal processor (ISP), a sensor hub processor, or a communication processor (CP)) that is operable independently from, or in conjunction with, the main processor  121 . For example, when the electronic device  101  includes the main processor  121  and the auxiliary processor  123 , the auxiliary processor  123  may be configured to use lower power than the main processor  121  or to be specified for a designated function. The auxiliary processor  123  may be implemented as separate from, or as part of the main processor  121 . 
     The auxiliary processor  123  may control at least some of functions or states related to at least one component (e.g., the display module  160 , the sensor module  176 , or the communication module  190 ) among the components of the electronic device  101 , instead of the main processor  121  while the main processor  121  is in an inactive (e.g., sleep) state, or together with the main processor  121  while the main processor  121  is in an active state (e.g., executing an application). According to an embodiment, the auxiliary processor  123  (e.g., an image signal processor or a communication processor) may be implemented as part of another component (e.g., the camera module  180  or the communication module  190 ) functionally related to the auxiliary processor  123 . According to an embodiment, the auxiliary processor  123  (e.g., the neural processing unit) may include a hardware structure specified for artificial intelligence model processing. The artificial intelligence model may be generated via machine learning. Such learning may be performed, e.g., by the electronic device  101  where the artificial intelligence is performed or via a separate server (e.g., the server  108 ). Learning algorithms may include, but are not limited to, e.g., supervised learning, unsupervised learning, semi-supervised learning, or reinforcement learning. The artificial intelligence model may include a plurality of artificial neural network layers. The artificial neural network may be a deep neural network (DNN), a convolutional neural network (CNN), a recurrent neural network (RNN), a restricted Boltzmann machine (RBM), a deep belief network (DBN), a bidirectional recurrent deep neural network (BRDNN), deep Q-network or a combination of two or more thereof but is not limited thereto. The artificial intelligence model may, additionally or alternatively, include a software structure other than the hardware structure. 
     The memory  130  may store various data used by at least one component (e.g., the processor  120  or the sensor module  176 ) of the electronic device  101 . The various data may include, for example, software (e.g., the program  140 ) and input data or output data for a command related thereto. The memory  130  may include the volatile memory  132  or the non-volatile memory  134 . 
     The program  140  may be stored in the memory  130  as software, and may include, for example, an operating system (OS)  142 , middleware  144 , or an application  146 . 
     The input module  150  may receive a command or data to be used by other component (e.g., the processor  120 ) of the electronic device  101 , from the outside (e.g., a user) of the electronic device  101 . The input module  150  may include, for example, a microphone, a mouse, a keyboard, keys (e.g., buttons), or a digital pen (e.g., a stylus pen). 
     The sound output module  155  may output sound signals to the outside of the electronic device  101 . The sound output module  155  may include, for example, a speaker or a receiver. The speaker may be used for general purposes, such as playing multimedia or playing record. The receiver may be used for receiving incoming calls. According to an embodiment, the receiver may be implemented as separate from, or as part of the speaker. 
     The display module  160  may visually provide information to the outside (e.g., a user) of the electronic device  101 . The display  160  may include, for example, a display, a hologram device, or a projector and control circuitry to control a corresponding one of the display, hologram device, and projector. According to an embodiment, the display  160  may include a touch sensor configured to detect a touch, or a pressure sensor configured to measure the intensity of a force generated by the touch. 
     The audio module  170  may convert a sound into an electrical signal and vice versa. According to an embodiment, the audio module  170  may obtain the sound via the input module  150 , or output the sound via the sound output module  155  or a headphone of an external electronic device (e.g., an electronic device  102 ) directly (e.g., wiredly) or wirelessly coupled with the electronic device  101 . 
     The sensor module  176  may detect an operational state (e.g., power or temperature) of the electronic device  101  or an environmental state (e.g., a state of a user) external to the electronic device  101 , and then generate an electrical signal or data value corresponding to the detected state. According to an embodiment, the sensor module  176  may include, for example, a gesture sensor, a gyro sensor, an atmospheric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an infrared (IR) sensor, a biometric sensor, a temperature sensor, a humidity sensor, or an illuminance sensor. 
     The interface  177  may support one or more specified protocols to be used for the electronic device  101  to be coupled with the external electronic device (e.g., the electronic device  102 ) directly (e.g., wiredly) or wirelessly. According to an embodiment, the interface  177  may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, a secure digital (SD) card interface, or an audio interface. 
     A connection terminal  178  may include a connector via which the electronic device  101  may be physically connected with the external electronic device (e.g., the electronic device  102 ). According to an embodiment, the connection terminal  178  may include, for example, a HDMI connector, a USB connector, a SD card connector, or an audio connector (e.g., a headphone connector). 
     The haptic module  179  may convert an electrical signal into a mechanical stimulus (e.g., a vibration or motion) or electrical stimulus which may be recognized by a user via his tactile sensation or kinesthetic sensation. According to an embodiment, the haptic module  179  may include, for example, a motor, a piezoelectric element, or an electric stimulator. 
     The camera module  180  may capture a still image or moving images. According to an embodiment, the camera module  180  may include one or more lenses, image sensors, image signal processors, or flashes. 
     The power management module  188  may manage power supplied to the electronic device  101 . According to an embodiment, the power management module  188  may be implemented as at least part of, for example, a power management integrated circuit (PMIC). 
     The battery  189  may supply power to at least one component of the electronic device  101 . According to an embodiment, the battery  189  may include, for example, a primary cell which is not rechargeable, a secondary cell which is rechargeable, or a fuel cell. 
     The communication module  190  may support establishing a direct (e.g., wired) communication channel or a wireless communication channel between the electronic device  101  and the external electronic device (e.g., the electronic device  102 , the electronic device  104 , or the server  108 ) and performing communication via the established communication channel. The communication module  190  may include one or more communication processors that are operable independently from the processor  120  (e.g., the application processor (AP)) and supports a direct (e.g., wired) communication or a wireless communication. According to an embodiment, the communication module  190  may include a wireless communication module  192  (e.g., a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module  194  (e.g., a local area network (LAN) communication module or a power line communication (PLC) module). A corresponding one of these communication modules may communicate with the external electronic device  104  via a first network  198  (e.g., a short-range communication network, such as Bluetooth™, wireless-fidelity (Wi-Fi) direct, or infrared data association (IrDA)) or a second network  199  (e.g., a long-range communication network, such as a legacy cellular network, a 5G network, a next-generation communication network, the Internet, or a computer network (e.g., local area network (LAN) or wide area network (WAN)). These various types of communication modules may be implemented as a single component (e.g., a single chip), or may be implemented as multi components (e.g., multi chips) separate from each other. The wireless communication module  192  may identify or authenticate the electronic device  101  in a communication network, such as the first network  198  or the second network  199 , using subscriber information (e.g., international mobile subscriber identity (IMSI)) stored in the subscriber identification module  196 . 
     The wireless communication module  192  may support a 5G network, after a 4G network, and next-generation communication technology, e.g., new radio (NR) access technology. The NR access technology may support enhanced mobile broadband (eMBB), massive machine type communications (mMTC), or ultra-reliable and low-latency communications (URLLC). The wireless communication module  192  may support a high-frequency band (e.g., the mmWave band) to achieve, e.g., a high data transmission rate. The wireless communication module  192  may support various technologies for securing performance on a high-frequency band, such as, e.g., beamforming, massive multiple-input and multiple-output (massive MIMO), full dimensional MIMO (FD-MIMO), array antenna, analog beam-forming, or large scale antenna. The wireless communication module  192  may support various requirements specified in the electronic device  101 , an external electronic device (e.g., the electronic device  104 ), or a network system (e.g., the second network  199 ). According to an embodiment, the wireless communication module  192  may support a peak data rate (e.g., 20 Gbps or more) for implementing eMBB, loss coverage (e.g., 164 dB or less) for implementing mMTC, or U-plane latency (e.g., 0.5 ms or less for each of downlink (DL) and uplink (UL), or a round trip of 1 ms or less) for implementing URLLC. 
     The antenna module  197  may transmit or receive a signal or power to or from the outside (e.g., the external electronic device). According to an embodiment, the antenna module  197  may include one antenna including a radiator formed of a conductor or conductive pattern formed on a substrate (e.g., a printed circuit board (PCB)). According to an embodiment, the antenna module  197  may include a plurality of antennas (e.g., an antenna array). In this case, at least one antenna appropriate for a communication scheme used in a communication network, such as the first network  198  or the second network  199 , may be selected from the plurality of antennas by, e.g., the communication module  190 . The signal or the power may then be transmitted or received between the communication module  190  and the external electronic device via the selected at least one antenna. According to an embodiment, other parts (e.g., radio frequency integrated circuit (RFIC)) than the radiator may be further formed as part of the antenna module  197 . 
     According to various embodiments, the antenna module  197  may form a mmWave antenna module. According to an embodiment, the mmWave antenna module may include a printed circuit board, a RFIC disposed on a first surface (e.g., the bottom surface) of the printed circuit board, or adjacent to the first surface and capable of supporting a designated high-frequency band (e.g., the mmWave band), and a plurality of antennas (e.g., array antennas) disposed on a second surface (e.g., the top or a side surface) of the printed circuit board, or adjacent to the second surface and capable of transmitting or receiving signals of the designated high-frequency band. 
     At least some of the above-described components may be coupled mutually and communicate signals (e.g., commands or data) therebetween via an inter-peripheral communication scheme (e.g., a bus, general purpose input and output (GPIO), serial peripheral interface (SPI), or mobile industry processor interface (MIPI)). 
     According to an embodiment, commands or data may be transmitted or received between the electronic device  101  and the external electronic device  104  via the server  108  coupled with the second network  199 . The external electronic devices  102  or  104  each may be a device of the same or a different type from the electronic device  101 . According to an embodiment, all or some of operations to be executed at the electronic device  101  may be executed at one or more of the external electronic devices  102 ,  104 , or  108 . For example, if the electronic device  101  should perform a function or a service automatically, or in response to a request from a user or another device, the electronic device  101 , instead of, or in addition to, executing the function or the service, may request the one or more external electronic devices to perform at least part of the function or the service. The one or more external electronic devices receiving the request may perform the at least part of the function or the service requested, or an additional function or an additional service related to the request, and transfer an outcome of the performing to the electronic device  101 . The electronic device  101  may provide the outcome, with or without further processing of the outcome, as at least part of a reply to the request. To that end, a cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technology may be used, for example. The electronic device  101  may provide ultra low-latency services using, e.g., distributed computing or mobile edge computing. In an embodiment, the external electronic device  104  may include an Internet-of-things (IoT) device. The server  108  may be an intelligent server using machine learning and/or a neural network. According to an embodiment, the external electronic device  104  or the server  108  may be included in the second network  199 . The electronic device  101  may be applied to intelligent services (e.g., smart home, smart city, smart car, or health-care) based on 5G communication technology or IoT-related technology. 
       FIG.  2 A  is a block diagram  200  illustrating an example electronic device  101  for supporting legacy network communication and 5G network communication according to various embodiments. Referring to  FIG.  2 A , the electronic device  101  may include a first communication processor  212 , a second communication processor  214 , a first radio frequency integrated circuit (RFIC)  222 , a second RFIC  224 , a third RFIC  226 , a fourth RFIC  228 , a first radio frequency front end (RFFE)  232 , a second RFFE  234 , a first antenna module  242 , a second antenna module  244 , a third antenna module  246 , and antennas  248 . The electronic device  101  may further include a processor  120  and a memory  130 . The second network  199  may include a first cellular network  292  and a second cellular network  294 . According to an embodiment, the electronic device  101  may further include at least one component among the components of  FIG.  1   , and the second network  199  may further include at least one other network. According to an embodiment, the first communication processor  212 , the second communication processor  214 , the first RFIC  222 , the second RFIC  224 , the fourth RFIC  228 , the first RFFE  232 , and the second RFFE  234  may form at least part of the wireless communication module  192 . According to an embodiment, the fourth RFIC  228  may be omitted or be included as part of the third RFIC  226 . 
     The first communication processor  212  may establish a communication channel of a band that is to be used for wireless communication with the first cellular network  292  or may support legacy network communication via the established communication channel. According to various embodiments, the first cellular network may be a legacy network that includes second generation (2G), third generation (3G), fourth generation (4G), or long-term evolution (LTE) networks. The second CP  214  may establish a communication channel corresponding to a designated band (e.g., from about 6 GHz to about 60 GHz) among bands that are to be used for wireless communication with the second cellular network  294  or may support fifth generation (5G) network communication via the established communication channel. According to an embodiment, the second cellular network  294  may be a 5G network defined by the 3rd generation partnership project (3GPP). Additionally, according to an embodiment, the first CP  212  or the second CP  214  may establish a communication channel corresponding to another designated band (e.g., about 6 GHz or less) among the bands that are to be used for wireless communication with the second cellular network  294  or may support fifth generation (5G) network communication via the established communication channel. 
     The first communication processor  212  may perform data transmission/reception with the second communication processor  214 . For example, data classified as transmitted via the second cellular network  294  may be changed to be transmitted via the first cellular network  292 . In this case, the first communication processor  212  may receive transmission data from the second communication processor  214 . For example, the first communication processor  212  may transmit/receive data to/from the second communication processor  214  via an inter-processor interface  213 . The inter-processor interface  213  may be implemented as, e.g., universal asynchronous receiver/transmitter (UART) (e.g., high speed-UART (HS-UART)) or peripheral component interconnect bus express (PCIe) interface, but is not limited to a specific kind of interface. The first communication processor  212  and the second communication processor  214  may exchange packet data information and control information using, e.g., a shared memory. The first communication processor  212  may transmit/receive various pieces of information, such as sensing information, output strength information, or resource block (RB) allocation information, to/from the second communication processor  214 . 
     According to an embodiment, the first communication processor  212  may not be directly connected with the second communication processor  214 . In this case, the first communication processor  212  may transmit/receive data to/from the second communication processor  214  via a processor  120  (e.g., an application processor). For example, the first communication processor  212  and the second communication processor  214  may transmit/receive data to/from the processor  120  (e.g., an application processor) via an HS-UART interface or PCIe interface, but the kind of the interface is not limited thereto. The first communication processor  212  and the second communication processor  214  may exchange control information and packet data information with the processor  120  (e.g., an application processor) using a shared memory. 
     According to an embodiment, the first communication processor  212  and the second communication processor  214  may be implemented in a single chip or a single package. According to an embodiment, the first communication processor  212  or the second communication processor  214 , along with the processor  120 , an auxiliary processor  123 , or communication module  190 , may be formed in a single chip or single package. For example, as shown in  FIG.  2 B , an integrated communication processor  260  may support all of the functions for communication with the first cellular network  292  and the second cellular network  294 . 
     Upon transmission, the first RFIC  222  may convert a baseband signal generated by the first communication processor  212  into a radio frequency (RF) signal with a frequency ranging from about 700 MHz to about 3 GHz which is used by the first cellular network  292  (e.g., a legacy network). Upon receipt, an RF signal may be obtained from the first network  292  (e.g., a legacy network) through an antenna (e.g., the first antenna module  242 ) and be pre-processed via an RFFE (e.g., the first RFFE  232 ). The first RFIC  222  may convert the pre-processed RF signal into a baseband signal that may be processed by the first communication processor  212 . 
     Upon transmission, the second RFIC  224  may convert a baseband signal generated by the first communication processor  212  or the second communication processor  214  into a Sub6-band (e.g., about 6 GHz or less) RF signal (hereinafter, “5G Sub6 RF signal”) that is used by the second cellular network  294  (e.g., a 5G network). Upon receipt, a 5G Sub6 RF signal may be obtained from the second cellular network  294  (e.g., a 5G network) through an antenna (e.g., the second antenna module  244 ) and be pre-processed via an RFFE (e.g., the second RFFE  234 ). The second RFIC  224  may convert the pre-processed 5G Sub6 RF signal into a baseband signal that may be processed by a corresponding processor of the first communication processor  212  and the second communication processor  214 . 
     The third RFIC  226  may convert a baseband signal generated by the second communication processor  214  into a 5G Above6 band (e.g., about 6 GHz to about 60 GHz) RF signal (hereinafter, “5G Above6 RF signal”) that is to be used by the second cellular network  294  (e.g., a 5G network). Upon receipt, a 5G Above6 RF signal may be obtained from the second cellular network  294  (e.g., a 5G network) through an antenna (e.g., the antenna  248 ) and be pre-processed via the third RFFE  236 . The third RFIC  226  may convert the pre-processed 5G Above6 RF signal into a baseband signal that may be processed by the second communication processor  214 . According to an embodiment, the third RFFE  236  may be formed as part of the third RFIC  226 . 
     According to an embodiment, the electronic device  101  may include the fourth RFIC  228  separately from, or as at least part of, the third RFIC  226 . In this case, the fourth RFIC  228  may convert the baseband signal generated by the second communication processor  214  into an intermediate frequency band (e.g., from about 9 GHz to about 11 GHz) RF signal (hereinafter, “IF signal”) and transfer the IF signal to the third RFIC  226 . The third RFIC  226  may convert the IF signal into a 5G Above6 RF signal. Upon receipt, the 5G Above6 RF signal may be received from the second cellular network  294  (e.g., a 5G network) through an antenna (e.g., the antenna  248 ) and be converted into an IF signal by the third RFIC  226 . The fourth RFIC  228  may convert the IF signal into a baseband signal that may be processed by the second communication processor  214 . 
     According to an embodiment, the first RFIC  222  and the second RFIC  224  may be implemented as at least part of a single chip or single package. According to various embodiments, when the first RFIC  222  and the second RFIC  224  in  FIG.  2 A or  2 B  are implemented as a single chip or a single package, they may be implemented as an integrated RFIC. In this case, the integrated RFIC may be connected to the first RFFE  232  and the second RFFE  234 , and the integrated RFIC may convert a baseband signal into a signal of a band supported by the first RFFE  232  and/or the second RFFE  234  and may transmit the converted signal to one of the first RFFE  232  and the second RFFE  234 . According to an embodiment, the first RFFE  232  and the second RFFE  234  may be implemented as at least part of a single chip or single package. According to an embodiment, at least one of the first antenna module  242  or the second antenna module  244  may be omitted or be combined with another antenna module to process multi-band RF signals. 
     According to an embodiment, the third RFIC  226  and the antenna  248  may be disposed on the same substrate to form the third antenna module  246 . For example, the wireless communication module  192  or the processor  120  may be disposed on a first substrate (e.g., a main painted circuit board (PCB)). In this case, the third RFIC  226  and the antenna  248 , respectively, may be disposed on one area (e.g., the bottom) and another (e.g., the top) of a second substrate (e.g., a sub PCB) which is provided separately from the first substrate, forming the third antenna module  246 . Placing the third RFIC  226  and the antenna  248  on the same substrate may shorten the length of the transmission line therebetween. This may reduce a loss (e.g., attenuation) of high-frequency band (e.g., from about 6 GHz to about 60 GHz) signal used for 5G network communication due to the transmission line. Thus, the electronic device  101  may enhance the communication quality with the second network  294  (e.g., a 5G network). 
     According to an embodiment, the antenna  248  may be formed as an antenna array which includes a plurality of antenna elements available for beamforming. In this case, the third RFIC  226  may include a plurality of phase shifters  238  corresponding to the plurality of antenna elements, as part of the third RFFE  236 . Upon transmission, the plurality of phase shifters  238  may change the phase of the 5G Above6 RF signal which is to be transmitted to the outside (e.g., a 5G network base station) of the electronic device  101  via their respective corresponding antenna elements. Upon receipt, the plurality of phase shifters  238  may change the phase of the 5G Above6 RF signal received from the outside to the same or substantially the same phase via their respective corresponding antenna elements. This enables transmission or reception via beamforming between the electronic device  101  and the outside. 
     The second cellular network  294  (e.g., a 5G network) may be operated independently (e.g., as standalone (SA)) from, or in connection (e.g., as non-standalone (NSA)) with the first cellular network  292  (e.g., a legacy network). For example, the 5G network may include access networks (e.g., 5G access networks (RANs)) but lack any core network (e.g., a next-generation core (NGC)). In this case, the electronic device  101 , after accessing a 5G network access network, may access an external network (e.g., the Internet) under the control of the core network (e.g., the evolved packet core (EPC)) of the legacy network. Protocol information (e.g., LTE protocol information) for communication with the legacy network or protocol information (e.g., New Radio (NR) protocol information) for communication with the 5G network may be stored in the memory  130  and be accessed by other components (e.g., the processor  120 , the first communication processor  212 , or the second communication processor  214 ). 
     According to various embodiments, at least one communication processor (e.g., the first communication processor  212 , the second communication processor  214 , or the integrated communication processor  260 ) may be implemented as a chip, circuit, or device for communication included in the electronic device  101 . For example, the at least one communication processor may include a controller and a memory (or register) in one chip. In various embodiments described below, the operations performed by the electronic device  101  or at least one communication processor (e.g., the first communication processor  212 , the second communication processor  214 , or the integrated communication processor  260 ) of the electronic device  101  may be performed by the controller included in the at least one communication processor, and the controller may perform the operations described below, by executing at least one command stored in the memory or register included in the at least one communication processor. 
       FIGS.  3 A,  3 B, and  3 C  are views illustrating example wireless communication systems providing legacy communication and/or 5G communication networks according to various embodiments. Referring to  FIGS.  3 A,  3 B, and  3 C , the network environment  300   a ,  300   b , and  300   c  may include at least one of a legacy network and a 5G network. The legacy network may include, e.g., a 3GPP-standard 4G or LTE base station  340  (e.g., an eNodeB (eNB)) that supports radio access with the electronic device  101  and an evolved packet core (EPC)  342  that manages 4G communication. The 5G network may include, e.g., a new radio (NR) base station  350  (e.g., a gNodeB (gNB)) that supports radio access with the electronic device  101  and a 5th generation core (5GC)  352  that manages 5G communication for the electronic device  101 . 
     According to an embodiment, the electronic device  101  may transmit or receive control messages and user data via legacy communication and/or 5G communication. The control messages may include, e.g., messages related to at least one of security control, bearer setup, authentication, registration, or mobility management for the electronic device  101 . The user data may include, e.g., user data except for control messages transmitted or received between the electronic device  101  and the core network  330  (e.g., the EPC  342 ). 
     Referring to  FIG.  3 A , according to an embodiment, the electronic device  101  may transmit or receive at least one of a control message or user data to/from at least part (e.g., the NR base station  351  or 5GC  352 ) of the 5G network via at least part (e.g., the LTE base station  341  or EPC  342 ) of the legacy network. 
     According to various embodiments, the network environment  300   a  may include a network environment that provides wireless communication dual connectivity (DC) to the LTE base station  341  and the NR base station  351  and transmits or receives control messages to/from the electronic device  101  via one core network  330  of the EPC  342  or the 5GC  352 . 
     According to various embodiments, in the DC environment, one of the LTE base station  341  or the NR base station  351  may operate as a master node (MN)  310 , and the other as a secondary node (SN)  320 . The MN  310  may be connected with the core network  330  to transmit or receive control messages. The MN  310  and the SN  320  may be connected with each other via a network interface to transmit or receive messages related to radio resource (e.g., communication channel) management therebetween. 
     According to an embodiment, the MN  310  may include the LTE base station  341 , the SN  320  may include the NR base station  351 , and the core network  330  may include the EPC  342 . For example, control messages may be transmitted/received via the LTE base station  341  and the EPC  342 , and user data may be transmitted/received via at least one of the LTE base station  341  or the NR base station  351 . 
     According to an embodiment, the MN  310  may include the NR base station  351 , and the SN  320  may include the LTE base station  341 , and the core network  330  may include the 5GC  352 . For example, control messages may be transmitted/received via the NR base station  351  and the 5GC  352 , and user data may be transmitted/received via at least one of the LTE base station  341  or the NR base station  351 . 
     Referring to  FIG.  3 B , according to an embodiment, the 5G network may include the NR base station  351  and the 5GC  352  and transmit or receive control messages and user data independently from the electronic device  101 . 
     Referring to  FIG.  3 C , according to an embodiment, the legacy network and the 5G network each may provide data transmission/reception independently. For example, the electronic device  101  and the EPC  342  may transmit or receive control messages and user data via the LTE base station  341 . As another example, the electronic device  101  and the 5GC  352  may transmit or receive control messages and user data via the NR base station  351 . 
     According to various embodiments, the electronic device  101  may be registered in at least one of the EPC  342  or the 5GC  352  to transmit or receive control messages. 
     According to various embodiments, the EPC  342  or the 5GC  352  may interwork with each other to manage communication for the electronic device  101 . For example, mobility information for the electronic device  101  may be transmitted or received via an interface between the EPC  342  and the 5GC  352 . 
     As set forth above, dual connectivity via the LTE base station  341  and the NR base station  351  may be referred to as E-UTRA new radio dual connectivity (EN-DC). Although EN-DC is described as an example in various embodiments described below, the same or similar description may be applied to various types of multi-radio dual-connectivity (MR-DC), including NR-E UTRA dual-connectivity (NE-DC). 
       FIG.  4    is a block diagram illustrating an example electronic device according to various embodiments. Referring to  FIG.  4   , the electronic device  101  may include a processor (e.g., the application processor (AP)  120  and a communication processor (CP) (e.g., the integrated communication processor  260 )). The communication processor  260  may include an LTE modem  410  and a 5G modem  420 .  FIG.  4    illustrates that the LTE modem  410  and the 5G modem  420  are included in one integrated communication processor  260 , but as shown in  FIG.  2 A , they may be included in the plurality of communication processors  212  and  214 , respectively. For example, the LTE modem  410  may correspond to the first communication processor  212  or be included in the first communication processor  212 , and the 5G modem  420  may correspond to the second communication processor  214  or be included in the second communication processor  214 . 
     According to various embodiments, the LTE modem  410  may include an LTE communication protocol stack. For example, the LTE modem  410  may include a non access stratum (NAS)  411  and an access stratum (AS)  412 . At least one operation performed by the NAS  411  and/or the AS  412  may be understood as being performed, e.g., by at least one of the first communication processor  212  or the integrated communication processor  260  of the electronic device  101 . The 5G modem  420  may include a 5G communication protocol stack. For example, the 5G modem  420  may include a NAS  421  and an AS  422 . At least one operation performed by the NAS  421  and/or the AS  422  may be understood as being performed, e.g., by at least one of the second communication processor  214  or the integrated communication processor  260  of the electronic device  101 . 
     According to various embodiments, the NAS  411  and  421  may correspond to the layer that transmits/receives traffic messages or signaling with the 5GC  352  of the 5G network  350  or the EPC  342  of the LTE network  340  with the electronic device  101  in the LTE protocol stack or 5G protocol stack. The NAS  411  and  421  may transfer related information or data to the processor  120  based on the message received through the AS  412  and  422 . The AS  412  and  422  may correspond to the layer related to the connection with the LTE base station  341  of the LTE network  340  or the NR base station  351  of the 5G network  350 . For example, the AS  412  and  422  may include layers of radio resource control (RRC), packet data convergence protocol (PDCP), radio link control (RLC), medium access control (MAC) and physical (PHY). According to an embodiment, the PDCP may be in charge of IP header compression/restoration. The RLC may perform an ARQ operation by reconfiguring a PDCP packet data unit (PDU) to an appropriate size. The MAC may perform an operation for multiplexing RLC PDUs into a MAC PDU and demultiplexing RLC PDUs from a MAC PDU. The PHY channel-codes and modulates higher layer data into orthogonal frequency division multiplexing (OFDM) symbols, transmits the OFDM symbols through a wireless channel or demodulates OFDM symbols received through a wireless channel, channel-decodes and transfers the same to a higher layer. 
     According to various embodiments, an electronic device  101  (e.g., at least one of the processor  120 , the first communication processor  212 , the second communication processor  214 , the integrated communication processor  260 , or the integrated SoC (not shown)) may receive an RRC connection reconfiguration (or RRC reconfiguration) message from the LTE network  340  or 5G network  350 . The electronic device  101  may reconfigure the RRC connection based on the RRC connection reconfiguration message. The RRC connection reconfiguration message may include any one of an RRC connection reconfiguration message or an RRC reconfiguration message. The electronic device  101  may form an RRC connection with, e.g., the LTE network  340  or 5G network  350  and may then receive an RRC connection reconfiguration message. The electronic device  101  may transmit an RRC connection reconfiguration complete message, which indicates that the reconfiguration is complete, to the LTE network  340  or 5G network  350 . The LTE network  340  or 5G network  350  may be a base station (e.g., at least one of an eNB  341 , a gNB  351 , an ng-eNB, or an en-gNB) corresponding to the communication for configuring the RRC connection reconfiguration message but, if some of the functions of the base station are virtualized, the network  400  may be implemented as at least part of a server for performing the virtualized functions and hardware for radio control. The LTE network  340  or 5G network  350  may be referred to as a serving cell. In an embodiment described below, for convenience, the 5G network  350  may be referred to as a first communication network, and the LTE network  340  may be referred to as a second communication network, but the disclosure is not limited thereby. 
     According to an embodiment, the process of the RRC connection reconfiguration may be one for reconfiguring the RRC connection (e.g., configuring, adjusting, and/or releasing a resource block (RB)) and synchronization and reconfiguration, setting up, adjusting, and/or releasing measurement, and adding, adjusting, and/or releasing an SCell. As part of the RRC connection reconfiguration process, NAS dedicated information may be transmitted from the LTE network  340  or 5G network  350  to the electronic device  101 . When the electronic device  101  is in, e.g., an RRC connected state (RRC_CONNECTED state), the LTE network  340  or 5G network  350  may perform an RRC connection reconfiguration procedure. For example, if the RRC connection reconfiguration message includes a measurement configuration (e.g., measConfig of 3GPP TS 38.331 or 36.331), the electronic device  101  may perform a measurement configuration procedure (e.g., the measurement configuration procedure set forth in 3GPP TS 38.331 or 36.331). 
     As described above, according to an embodiment, the LTE network  340  or 5G network  350  may be configured to allow the electronic device  101  in the RRC connected state to perform measurement and reporting according to the measurement configuration. The measurement configuration may be provided via UE dedicated RRC signaling, e.g., an RRC connection reconfiguration message. For example, if the electronic device  101  performs 3GPP LTE communication with the LTE network  340  or communication for control of dual connectivity is set to 3GPP LTE communication, the electronic device  101  may be requested to perform the following types of communication:
         intra-frequency measurement: measurement at downlink carrier frequency(ies) of serving cell(s)   inter-frequency measurement: measurement at frequencies different from any frequency among downlink carrier frequency(ies) of serving cell(s)   measurement in the frequency of inter-RAT (e.g., NR, UTRA, GERAN, CDMA 2000 HRPD or CDMA 2000 1×RTT)       

     For example, if the electronic device  101  performs 5G communication with the 5G network  350  or communication for control of dual connectivity is set to 5G communication, the following types of measurement may be performed.
         As NR measurement, e.g., intra-frequency measurement and/or inter-frequency measurement in NR   Inter-RAT measurement of E-UTRA frequency       

     The measurement configuration may include information about the measurement object (MO). The measurement object may include, e.g., the subcarrier spacing and frequency/time positions of the reference signal to be measured. The electronic device  101  may identify the frequency for measurement based on the measurement object in the measurement configuration. The measurement object may include a measurement object identity (e.g., ARFCN-ValueEUTRA and/or ARFCN-ValueNR), which is information indicating the frequency to be measured, or a cell blacklist and/or a cell whitelist. 
     According to an embodiment, the measurement configuration of the RRC connection reconfiguration message may include a reporting configuration. For example, the reporting configuration may include at least one of a reporting criterion, a reporting format, or an RS type, but is not limited thereto. The reporting criterion is a condition to trigger the UE to transmit a measurement report and may be a periodic or single event description. For, e.g., LTE communication, the reporting format may be information about quantity and relevant information (e.g., the number of cells to be reported) that the UE includes in the measurement report. For, e.g., 5G communication, the reporting format may be per-cell and per-beam quantity and other related information (e.g., the maximum per-cell number and the maximum number of cells to be reported) that is to be included in the measurement report. The RS type may denote, e.g., the RS of the beam to be used by the UE and the measurement result. 
     According to an embodiment, the measurement configuration of the RRC connection reconfiguration message may include at least one of measurement identity, quantity configuration, or measurement gap. The measurement identity may be a list of measurement identities associated with the measurement object. The quantity configuration may define a measurement filtering configuration and periodic reporting of measurement used in all event evaluation and related reporting. The measurement gap may be the period when the UE performs measurement, e.g., an interval during which uplink or downlink transmission is not scheduled. 
     According to various embodiments, the RRC-connected electronic device  101  may perform measurement on the measurement object. For example, the electronic device  101  may perform measurement on at least one of the RSRP, RSRQ, RSSI, or SINR corresponding to at least one of inter-frequency, intra-frequency, or inter-RAT based on the measurement configuration corresponding to each serving cell. “Electronic device  101  performs measurement on a communication signal” may refer, for example, to the electronic device  101  performing measurement on at least one of the RSRP, RSRQ, RSSI, or SINR at a reference point by a communication signal from the outside. 
     According to an embodiment, the electronic device  101  may determine whether the measurement result meets the reporting criteria. The reporting criteria may include, but are not limited to, the following:
         Event A1: Serving becomes better than threshold   Event A2: Serving becomes worse than threshold   Event A3: Neighbour becomes offset better than PCell/PSCell (or SpCell of NR)   Event A4: Neighbour becomes worse than threshold   Event A5: PCell/PSCell (or, SpCell of NR) becomes worse than threshold 1  and neighbor (or neighbour/SCell of NR) becomes better than threshold 2     Event A6: Neighbour becomes offset better than SCell (or SCell of NR)   Event B1: Inter RAT neighbour becomes better than threshold   Event B2: PCell becomes worse than threshold 1  and inter RAT neighbour becomes better than threshold 2         

     The above-enumerated reporting criteria may follow, e.g., 3GPP TS 36.331 or 3GPP TS 38.331 but are not limited to a specific kind. 
     According to an embodiment, the electronic device  101  may perform the measurement, which needs to be performed by the measurement configuration, not constantly but at measurement periods. According to an embodiment, based on meeting the reporting criteria, the electronic device  101  may transmit a measurement report message to the LTE network  340  or 5G network  350  (e.g., the serving cell). For example, if the met reporting criterion among the above-described reporting criteria is maintained while the timer corresponding to the time-to-trigger value operates (e.g., before the timer expires), the electronic device  101  may transmit a measurement report message to the LTE network  340  or 5G network  350 . For the measurement reporting process-triggered measurement identity, the electronic device  101  may configure the measurement result (e.g., measResults of 3GPP TS 38.331 or 3GPP TS 36.331) in the measurement report message. The information element (IE) of the measurement result may include the measurement result (e.g., at least one of RSRP, RSRQ, or SINR) for intra-frequency, inter-frequency, and inter-RAT mobility. For example, the measurement report message may include the measurement identity and the measurement result. 
     Hereinafter, a situation in which VoLTE is performed by performing EPS fallback according to a call request during 5G network connection is described with reference to  FIGS.  5  and  6   . According to various embodiments, the EPS fallback or RAT fallback may be performed in the form of a handover as shown in  FIG.  5    or redirection as shown in  FIG.  6    according to network implementation and operator policy. 
       FIG.  5    is a signal flowchart illustrating example handover-based EPS fallback operations according to various embodiments. Referring to  FIG.  5   , according to the user&#39;s call request, the electronic device  101  (e.g., the transmitting terminal (MO terminal)) and the 5G network  350  may be switched from the RRC idle state to the RRC connected state in operation  502 . According to various embodiments, the electronic device  101  may transmit a SIP INVITE message to the IMS server  500  through the 5G network  350  in operation  504 . Although not shown in  FIG.  5   , the 5G network  350  may transmit a paging signal to a receiving electronic device (e.g., an MT terminal). The receiving electronic device may be switched from the idle state to the active state according to the reception of the paging signal and may receive the SIP INVITE message sent from the transmitting electronic device  101 . The receiving electronic device may receive the SIP INVITE message and may transmit a SIP 180 RINGING message to the IMS server  500 . In operation  506 , the IMS server  500  may transmit the SIP 180 RINGING message transmitted from the receiving electronic device to the electronic device  101 , which is the transmitting terminal, through the 5G communication network. According to various embodiments, if the receiving electronic device (MT terminal) answers, a SIP 200 OK message may be transmitted to the IMS server  500 . In operation  508 , the IMS server  500  may transmit the SIP 200 OK message to the electronic device  101  through the 5G network  350 . 
     According to various embodiments, the 5G network  350  may trigger EPS fallback in operation  510 . When handover-based EPS fallback is configured in the 5G network  350  (e.g., gNB  351 ), the 5G network  350  may transmit an measConfig for LTE band measurement to the electronic device  101  through RRC reconfiguration in operation  512 . According to the reception of the RRC reconfiguration in operation  512 , the electronic device  101  may transmit a RRC reconfiguration complete to the 5G network  350  in operation  514 . According to various embodiments, the electronic device  101  may report the LTE measurement information measured based on information included in the RRC reconfiguration (e.g., measurement object (MO)) to the 5G network  350  through the measurement report (MR) message in operation  516 . Based on the received MR, the 5G network  350  may transmit information about the LTE band and cell to which the electronic device  101  is to be handed over to the electronic device  101  through a mobilityFromNRCommand in operation  518 . 
     According to various embodiments, the electronic device  101  may perform a tracking area update (TAU) procedure with the LTE network  340  (e.g., the eNB  341 /EPC  342 ) based on the corresponding LTE band and cell information. For example, the electronic device  101  may transmit a TAU request to the LTE network  340  in operation  520  and, in operation  522 , may receive a TAU accept from the LTE network  340 . The electronic device  101  may receive the TAU accept and, in operation  524 , may complete the inter-RAT handover process for EPS fallback by transmitting a TAU complete to the LTE network  340 . According to various embodiments, after the EPS fallback procedure is completed, the electronic device  101  and the LTE network  340  (e.g., the eNB  341 /EPC  342 ) may set up a VoLTE call in operation  526 . 
       FIG.  6    is a signal flowchart illustrating example redirection-based EPS fallback operations according to various embodiments. Referring to  FIG.  6   , according to the user&#39;s call request, the electronic device  101  (e.g., the transmitting terminal (MO terminal)) and the 5G network  350  (e.g., the gNBN  351 /5GC  352 ) may be switched from the RRC idle state to the RRC connected state in operation  602 . According to various embodiments, the electronic device  101  may transmit a SIP INVITE message to the IMS server  500  through the 5G network  350  in operation  604 . Although not shown in  FIG.  9   , the 5G network  350  may transmit a paging signal to a receiving electronic device (e.g., an MT terminal). The receiving electronic device may be switched from the idle state to the active state according to the reception of the paging signal and may receive the SIP INVITE message sent from the transmitting electronic device  101 . The receiving electronic device may receive the SIP INVITE message and may transmit a SIP 180 RINGING message to the IMS server  500 . In operation  606 , the IMS server  500  may transmit the SIP 180 RINGING message transmitted from the receiving electronic device to the electronic device  101 , which is the transmitting terminal, through the 5G network  350 . According to various embodiments, if the receiving electronic device (MT terminal) answers, a SIP 200 OK message may be transmitted to the IMS server  500 . In operation  608 , the IMS server  500  may transmit the SIP 200 OK message to the electronic device  101  through the 5G network  350 . 
     According to various embodiments, the 5G network  350  may trigger EPS fallback in operation  610 . The 5G network  350  may transmit a measConfig for LTE band measurement to the electronic device  101  through RRC reconfiguration in operation  612 . According to the reception of the RRC reconfiguration in operation  612 , the electronic device  101  may transmit a RRC reconfiguration complete to the 5G network  350  in operation  614 . According to various embodiments, the electronic device  101  may report the LTE measurement information measured based on information included in the RRC reconfiguration (e.g., measurement object (MO)) to the 5G network  350  through the measurement report (MR) message in operation  616 . According to various embodiments, if redirection-based EPS fallback is configured in the 5G network  350  (e.g., gNB  351 ), the 5G network  350  may include a specific LTE E-ARFCN (absolute radio frequency channel number) in an RRC release message and transmit it to the electronic device  101  in operation  618 . The electronic device  101  may move to the LTE communication network, perform a cell scan on the corresponding E-ARFCN, and then proceed with a TAU procedure for camping on any one cell. For example, the electronic device  101  may perform a TAU procedure with the corresponding LTE communication network  340  (e.g., the eNB  341 /EPC  342 ) according to the cell scan. For example, the electronic device  101  may transmit a TAU request to the LTE network  340  in operation  620  and, in operation  622 , may receive a TAU accept from the LTE network  340 . The electronic device  101  may receive the TAU accept and, in operation  624 , may complete the inter-RAT handover process for EPS fallback by transmitting a TAU complete to the LTE network  340 . According to various embodiments, after the EPS fallback procedure is completed, the electronic device  101  and the LTE network  340  may set up a VoLTE call in operation  626 . 
     Hereinafter, methods for reducing current consumption in an electronic device according to various embodiments are described with reference to  FIGS.  7  to  28   . Methods described below may be performed through the electronic device  101  described above in connection with  FIG.  1 ,  2 A,  2 B,  3 A,  3 B , or  3 C. 
       FIG.  7    is a flowchart illustrating operations of an example electronic device according to various embodiments. Referring to  FIG.  7   , according to various embodiments, the electronic device  101  may make a call to or receive a call from an external electronic device. The electronic device  101  may perform a call setup procedure with the currently connected communication network. For example, the electronic device  101  (e.g., at least one of the processor  120 , the first communication processor  212 , the second communication processor  214 , or the integrated communication processor  260 ) may set up a VoNR call with an external electronic device through the 5G network  350  in a state connected to the 5G network  350  in operation  702 . According to various embodiments, when both the electronic device  101  and the 5G network support VoNR, the VoNR call may be set up, and if any one does not support VoNR, the call may be connected through VoLTE by the EPS fallback described above in connection with  FIGS.  5  and  6   . 
     According to various embodiments, the electronic device  101  may include whether VoNR is supported in the UE capability information exemplified in Table 1 below and notify the communication network. 
     
       
         
           
               
             
               
                 TABLE 1 
               
               
                   
               
             
            
               
                 UE-NR-Capability information element 
               
            
           
           
               
               
            
               
                 UE-NR-Capability-v1540 ::= 
                  SEQUENCE { 
               
            
           
           
               
               
               
            
               
                   sdap-Parameters 
                  SDAP-Parameters 
                    OPTIONAL, 
               
               
                   overheatingInd 
                 ENUMERATED {supported} 
                      OPTIONAL, 
               
               
                   ims-Parameters 
                   IMS-Parameters 
                     OPTIONAL, 
               
            
           
           
               
               
            
               
                   fr1-Add-UE-NR-Capabilities-v1540 
                   UE-NR-CapabilityAddFRX-Mode-v1540 
               
            
           
           
               
            
               
                 OPTIONAL, 
               
            
           
           
               
               
            
               
                   fr2-Add-UE-NR-Capabilities-v1540 
                   UE-NR-CapabilityAddFRX-Mode-v1540 
               
            
           
           
               
            
               
                 OPTIONAL, 
               
            
           
           
               
               
            
               
                   fr1-ft2-Add-UE-NR-Capabilities 
                   UE-NR-CapabilityAddFRX-Mode 
               
            
           
           
               
            
               
                 OPTIONAL, 
               
            
           
           
               
               
            
               
                   nonCriticalExtension 
                 UE-NR-Capability-v1550 
               
            
           
           
               
            
               
                 OPTIONAL 
               
               
                 } 
               
               
                 IMS-Parameters information element 
               
               
                 IMS-ParametersFRX-Diff ::= SEQUENCE { 
               
            
           
           
               
               
               
            
               
                  voiceOverNR 
                  ENUMERATED {supported} 
                       OPTIONAL, 
               
            
           
           
               
            
               
                  ... 
               
               
                 } 
               
               
                   
               
            
           
         
       
     
     Referring to Table 1 above, as “voiceOverNR” in the IE of “IMS-Parameters” in the UE capability information transmitted from the electronic device  101  to the communication network (e.g., the 5G network  350 ) is specified as “supported,” the communication network may identify that the electronic device  101  is an electronic device supporting VoNR. According to various embodiments, when a call is received or transmitted by the electronic device  101  in a case in which both the electronic device  101  and the 5G network  350  support VoNR as described above, the call may be connected through VoNR. 
     According to various embodiments, the electronic device  101  may notify the communication network whether it supports VoNR by transmitting the UE capability information to the communication network when the electronic device  101  first registers its location in the communication network. Thereafter, if the UE capability information is updated, the electronic device  101  may transmit the updated information to the communication network (e.g., 5G network (e.g., gNB)). For example, in the 5G communication system, the electronic device  101  may update the UE capability information by setting the “NG-RAN Radio Capability Update” in the registration request message to 1 as exemplified in Table 2 below. 
     
       
         
           
               
             
               
                 TABLE 2 
               
               
                   
               
             
            
               
                 NG-RAN Radio Capability Update (NG-RAN-RCU) (octet 3, bit 2) 
               
               
                 Bit 
               
               
                 UE radio capability update not needed 
               
               
                 UE radio capability update needed 
               
               
                   
               
            
           
         
       
     
     Referring to Table 2, the electronic device  101  may set the “NG-RAN Radio Capability Update” in the registration request message to 1 and transmit it to the communication network, thereby notifying the communication network that the UE capability information needs to be updated. The communication network may identify that the electronic device  101  needs update of the UE capability through the registration request message transmitted from the electronic device  101 . The communication network may transmit a UE capability enquiry message to the electronic device  101  to identify the UE capability update information. The electronic device  101  may receive the UE capability enquiry message from the communication network and transmit UE capability information including the updated information to the communication network. As described above, the UE capability information may include information regarding whether the electronic device  101  supports VoNR. 
     According to various embodiments, the electronic device  101  may connect the VoNR call by performing a VoNR call setup procedure as described above. After the VoNR call connection, the electronic device  101  may perform the call with the counterpart electronic device (e.g., an external electronic device). The throughput (T-put) required for VoNR may be relatively low since data for call is transmitted/received. For example, VoNR may be normally served even when the layers corresponding to multiple-input and multiple-output (MIMO) of the electronic device  101  are 2 layers, but the communication network may set 4 layers depending on the channel state. If four layers are configured in the electronic device  101 , and signals are received through four antennas, i.e., 4Rx operation, unnecessary current consumption may occur. Table 3 below exemplifies the current consumption for each layer upon operating on VoNR and current consumption upon operating VoLTE. 
     
       
         
           
               
               
               
               
               
             
               
                 TABLE 3 
               
               
                   
               
               
                 VoNR/VoLTE 
                 VoNR 
                 VoNR 
                 VoNR 
                 VoLTE 
               
               
                   
               
             
            
               
                 Frequency 
                 N78 TDD 
                 N78 TDD 
                 N3 TDD 
                 B20 
               
               
                 band 
                 100M 
                 20M 
                 20M 
                 100M 
               
               
                 Bandwidth 
                 256QAM 
                 256QAM 
                 256QAM 
               
               
                 Modulation 
                 4 × 4 
                 4 × 4 
                 2 × 2 
               
               
                 scheme 
               
               
                 MIMO 
               
               
                 voice codec 
                 AMR WB 
                 AMR WB 
                 AMR WB 
                 AMR WB 
               
               
                   
                 12.65 
                 12.65 
                 12.65 
                 12.65 
               
               
                 VBAT 
                 245 mA  
                 195 mA  
                 180 mA  
                 105 mA  
               
               
                 RFIC 
                 85 mA 
                 55 mA 
                 38 mA 
                 16 mA 
               
               
                 MODEM 
                 65 mA 
                 49 mA 
                 48 mA 
                 22 mA 
               
               
                   
               
            
           
         
       
     
     Referring to Table 3, it may be identified that the power consumption of VBAT, RFIC, and MODEM differs according to frequency band, bandwidth, modulation scheme, MIMO, or voice codec. The consumed current of the VBAT may include the current consumed in the overall electronic device  101 . The consumed current of the RFIC may include the current consumed in at least one of the first RFIC  222 , second RFIC  224 , or third RFIC  226  of  FIGS.  2 A and  2 B . The consumed current of the MODEM may include the current consumed in at least one of the first communication processor  212 , the second communication processor  214 , or the integrated communication processor  260  of  FIG.  2 A or  2 B . For example, referring to Table 3, it may be identified that VoNR consumes relatively more current than VoLTE. It may be identified that even for the same VoNRs, current consumption is relatively larger when a bandwidth of 100 MHz is used than when a bandwidth of 20 MHz is used, and current consumption is relatively larger when the layers corresponding to MIMO are 4 layers (e.g., 4×4) are used than when the layers are 2 layers. 
     According to various embodiments, the electronic device  101  attaches to the 5G network  350 , registers VoNR, and then, upon call connection, may set up a VoNR call. To reduce current consumption according to Table 3, the electronic device  101  may perform EPS fallback on VoNR as described above in connection with  FIGS.  5  and  6   , but the call connection may be delayed due to the EPS fallback. For example, even when the electronic device  101  is connected to the 5G network through the SA scheme, if switching to VoLTE by EPS fallback technology upon call connection for various reasons, call connection may take a relatively long time. According to various embodiments, if a service is provided after EPS fallback to VoLTE considering current consumption or heat generation although the electronic device  101  is capable of VoNR connection, a call connection may take a long time as described above in connection with  FIGS.  5  and  6   . The electronic device  101  may fail to receive the high-quality service provided by VoNR or specified functions of VoNR. According to various embodiments described below, the electronic device  101  may reduce current consumption by various methods if call quality is ensured even in the VoNR call-connected state. 
     According to various embodiments, the electronic device  101  may identify information related to call quality in a VoNR call connected state with the external electronic device in operation  704 . For example, the information related to the call quality may include at least one of signal to interference and noise ratio (SINR), reference signal received power (RSRP), block error rate (BLER), modulation and coding scheme (MCS), residual error, or real time protocol (RTP) packet non-received information. 
     According to various embodiments, the electronic device  101  may perform at least one operation to reduce current consumption based on identifying that the call quality-related information meets a designated condition in operation  706 . For example, the electronic device  101  may reduce current consumption by performing the operation of reducing the number of antennas for reception among the plurality of antennas (e.g., from 4Rx to 2Rx) based on identifying that the call quality-related information meets the designated condition. According to various embodiments, the operation of reducing current consumption may be implemented in other various manners than reducing the number of antennas. For example, the electronic device  101  may reduce current consumption by limiting the overall bandwidth of the serving cell and reduce current consumption by reducing the number of CAs. In various embodiments described below, the operation of reducing the number of reception antennas is described as an example of reducing current consumption, but embodiments are not limited thereto. According to various embodiments, although  FIG.  7    illustrates performing the operation of reducing the number of antennas for reception in the call connected state, the operation may alternatively be performed before or during the call setup procedure. According to various embodiments, when the electronic device  101  performs the operation of reducing the number of reception antennas in the call connected state, call quality may temporarily be degraded but a call drop may not immediately occur. 
     Specific examples for determining whether call quality is ensured using each piece of information related to call quality are described below. According to various embodiments, the electronic device  101  may identify that call quality is ensured based on identifying that the SINR is a first setting value (e.g., 8 dB) or more. Upon identifying that the SINR is the first setting value (e.g., 8 dB) or more in the VoNR call connected state, the electronic device  101  may determine that call quality is ensured and control to reduce the number of reception antennas to reduce current consumption. Upon identifying that the SINR is a second setting value (e.g., 5 dB) or less over time in the VoNR call connected state, the electronic device  101  may determine that call quality is not ensured and control to increase the number of reception antennas. 
     According to various embodiments, the electronic device  101  may identify that call quality is ensured based on identifying that the BLER is a third setting value (e.g., 20%) or less. For example, upon identifying that the BLER is the third setting value (e.g., 20%) or less in the VoNR call connected state, the electronic device  101  may determine that call quality is ensured and control to reduce the number of reception antennas to reduce current consumption. Upon identifying that the BLER is more than the third setting value (e.g., 20%) over time in the VoNR call connected state, the electronic device  101  may determine that call quality is not ensured and control to increase the number of reception antennas. 
     According to various embodiments, when the downlink modulation coding scheme (MCS) is the maximum value or a set value or more, the electronic device  101  may identify that call quality is ensured. The downlink MCS is a value for determining the modulation scheme to be used for data to be transmitted from the communication network to the electronic device  101 . The communication network may determine the modulation scheme according to the channel environment reported by the electronic device  101  and transfer it to the electronic device  101  through downlink control indicator (DCI). The electronic device  101  may identify the DCI transmitted from the communication network and demodulate the packets received based on the set modulation scheme. For example, as shown in Table 4 below, the modulation order corresponding to the MCS may be determined, and the modulation order may refer, for example, to the number of bits that may be transmitted from one resource element (RE). 
     
       
         
           
               
               
               
             
               
                   
                 TABLE 4 
               
               
                   
                   
               
               
                   
                 modulation scheme 
                 modulation order 
               
               
                   
                   
               
             
            
               
                   
                 BPSK 
                 1 
               
               
                   
                 QPSK 
                 2 
               
               
                   
                 16QAM 
                 4 
               
               
                   
                 64QAM 
                 6 
               
               
                   
                 256QAM 
                 8 
               
               
                   
                   
               
            
           
         
       
     
     For example, as the modulation order increases, more data may be transmitted in the same bandwidth and time, but it may be more vulnerable to noise and interference by other signals around. Thus, under a poor channel environment, the communication network may lower the modulation order through the MCS and transmit data. If the channel environment is good, the communication network may set a higher modulation order for relatively fast transmission. The electronic device  101  may determine whether call quality is ensured through the MCS set from the communication network. For example, if the electronic device  101  supports 256QAM, and the communication state is good, the communication network may set the modulation order to 8. The electronic device  101  may determine that call quality is ensured based on the modulation order and perform the operation of reducing the number of reception antennas. Thereafter, as the channel state is changed, if the modulation order is set to 6, the electronic device  101  may perform the operation of increasing the number of reception antennas. According to various embodiments, the modulation order or reference value of modulation scheme (MCS) for determining that call quality is ensured may be set to the maximum value as settable in the electronic device  101  or an average for a set time. For example, when the electronic device  101  supports 256QAM but the channel state is poor, the MCS may be set to 18 which corresponds to the modulation order of 6. In such a case, the average MCS during a previous predetermined time, e.g., previous 10 seconds, may be 18, and the reference value of MCS may be set to 18. If the MCS set by the communication network is not less than 18 set as the reference value, the electronic device  101  may determine that call quality is ensured and perform the operation of reducing the number of reception antennas. 
     According to various embodiments, the electronic device  101  may identify whether call quality is ensured based on the residual error. For example, upon identifying that the residual error is a fourth setting value (e.g., 10%) or less in the VoNR call connected state, the electronic device  101  may determine that call quality is ensured and control to reduce the number of reception antennas to reduce current consumption. Upon identifying that the residual error is more than the fourth setting value (e.g., 10%) over time in the VoNR call connected state, the electronic device  101  may determine that call quality is not ensured and control to increase the number of reception antennas. The residual error may refer, for example, to an error that occurs due to failure in transmission despite retransmission by the maximum number of times at the hybrid automatic repeat request (HARQ). The occurrence of the residual error may refer, for example, to occurrence of HARQ data loss and this corresponds to an environment in which performance degradation occurs. Thus, it may be used as a condition for determining whether call quality is ensured. For example, the occurrence of the residual error may be regarded as impossibility of normally receiving data packets because the data packets are broken, and this may be related to the BLER. For example, if a BLER of 10% or more occurs, communication may be determined as having a problem. If a residual error of the fourth setting value (e.g., 10%) or more occurs in the downlink packets generated during a predetermined time, the electronic device  101  may control to increase the number of reception antennas and, if less than the fourth setting value, control to reduce the number of reception antennas. According to various embodiments, if a predetermined number of, or more, consecutive residual errors occur, the electronic device  101  may control to increase the number of reception antennas. In contrast, if no residual error occurs for HARQ data a predetermined number of times or more in a state in which the number of reception antennas has been increased or if no residual error occurs during a predetermined time, the electronic device  101  may control to reduce the number of reception antennas. 
     According to various embodiments, the electronic device  101  may identify whether call quality is ensured based on the real time protocol (RTP) packet For example, the electronic device  101  may determine whether call quality is ensured based on the number of non-received RTP packets. The RTP packet may include, for example, voice data, and RTP packets should be continuously received for the receive side to seamlessly hear the voice. If there is a packet loss in the middle or no packets are downstreamed during a predetermined time, the electronic device  101  may experience voice drops or silence or such call quality degradation. As a common way to prevent such call quality degradation, the electronic device  101  may have a buffer to reproduce the other party&#39;s voice seamlessly through buffering when transmission of RTP packets is delayed. When packet loss occurs, the electronic device  101  may use an algorithm that restores the voice by referring to the previous or subsequent packets received. If packet transmission is delayed for a longer time than the time for which packets may be stored in the buffer or if packets are not transmitted, and voice restoration fails, the user may experience degradation of voice quality that he may perceive. According to various embodiments, if the RTP packet having a specific sequence number is not received or no RTP packet is received for a longer time than the length of the buffer in a state in which the number of reception antennas has been reduced, the electronic device  101  may control to increase the number of reception antennas. The size of the buffer may be varied by the own algorithm of the electronic device  101  depending on the channel environment and may have a size corresponding to 2 or 3 RTP packets or 5 or 6 RTP packets. If the buffer size increases, it is possible to respond to a longer packet data transmission delay, but the difference between the time when the other party speaks and the time when the user hears it increases as well, thus causing a voice reception delay. Thus, it may be avoided to use a large-capacity buffer despite a good channel circumstance. According to various embodiments, the electronic device  101  may set the size of the buffer being currently used as a criterion for determining whether call quality is ensured. For example, if the electronic device  101  is currently using a buffer having a size corresponding to three RTP packets, the electronic device  101  may control to increase the number of reception antennas when failing to receive three or more consecutive RTP packets while controlling to reduce the number of reception antennas. Further, if failure to receive RTP packets does not occur for a predetermined number of packets or for a predetermined time in a state in which the number of reception antennas has been controlled to be increased, the electronic device  101  may control to decrease the number of reception antennas. For example, if RTP packets are received for 10 seconds without missing after the number of reception antennas has been switched to four due to failure to receive RTP packets during a call, the electronic device  101  may switch the number of reception antennas back to two. The state in which the electronic device  101  uses four antennas as the reception antennas and/or receives signals and/or data using four reception antennas is referred to as a ‘4Rx mode,’ and the state in which the electronic device  101  uses two antennas as the reception antennas and/or receives signals and/or data using two reception antennas is referred to as a ‘2Rx mode,’ but embodiments are not limited by these terms. 
     Various embodiments in which the electronic device  101  receives the number of reception antennas are described below with reference to  FIGS.  8 ,  9 ,  10 ,  11 ,  12 , and  13   . In the following embodiments, an example of switching from the 4Rx mode in which four reception antennas are operated to the 2Rx mode in which two reception antennas are operated is described, but the various embodiments are not limited in this respect. 
     According to various embodiments, the communication network may set layers corresponding to the multiple-input and multiple-output (MIMO) based on the information received from the electronic device  101  and notify the electronic device  101 . The electronic device  101  may set the number of reception antennas based on the layers received from the communication network. For example, when the communication network sets four layers (e.g., 4×4), the electronic device  101  may operate in the 4Rx mode of receiving signals using four reception antennas. When the communication network sets two layers (e.g., 2×2), the electronic device  101  may operate in the 2Rx mode of receiving signals using two reception antennas or the 4Rx mode of receiving signals using four reception antennas. When the electronic device  101  operates in the 4Rx mode in the state of being configured with two layers, two of the four reception antennas may be operated as diversity antennas. 
     According to various embodiments, as described above, if call quality is ensured in the VoNR call connected state of the electronic device  101 , the electronic device  101  may switch from the 4Rx mode to the 2Rx mode, reducing current consumption. If the channel state of the electronic device  101  is good and the communication network configures four layers, the electronic device  101  cannot operate in the 2Rx mode but may operate only in the 4Rx mode. 
     According to various embodiments, if call quality is ensured in the VoNR call connected state of the electronic device  101 , the electronic device  101  may lead the communication network to configure two layers to be able to operate in the 2Rx mode according to various embodiments described below. For example, the electronic device  101  may lead the communication network to configure two layers by reporting the rank indicator (RI) as 2, not 4, although the channel state is good. When the electronic device  101  reports an RI set to be different from the actual one as described above, this may be referred to as reporting of a fake RI, but the disclosure is not limited by this terminology. For example, the electronic device  101  may report the RI of the electronic device  101  to the communication network through channel state information (CSI) reporting, and the communication network may determine layers to be used for actual communication by referring to it. According to various embodiments, even in a context in which the electronic device  101  may indeed use four layers with the communication network, the electronic device  101  may report the RI, as 2, to the communication network so that the communication network may configure two layers. 
     According to various embodiments, the electronic device  101  may lead the communication network to configure two layers by transmitting a fake SRS or refraining from transmitting an SRS. An example of SRS transmission is described below with reference to  FIGS.  8 ,  9 ,  10 ,  11 , and  12   . 
       FIGS.  8  and  9    are views illustrating transmission of a reference signal by an example electronic device according to various embodiments. Referring to  FIG.  8   , an electronic device  101  (e.g., the electronic device  101  of  FIG.  1   ) may transmit a reference signal (e.g., an SRS) through four antennas (e.g., a first antenna  811 , a second antenna  812 , a third antenna  813 , and a fourth antenna  814 ). For example, the electronic device  101  may amplify the reference signal through at least one power amplifier (PA)  815  and may transmit the amplified reference signal to the first antenna  811 , the second antenna  812 , the third antenna  813 , and the fourth antenna  814  through at least one switch  816 . The reference signal (e.g., an SRS) transmitted through each antenna (e.g., the first antenna  811 , the second antenna  812 , the third antenna  813 , and the fourth antenna  814 ) of the electronic device  101  may be received through each antenna  821  of a base station  820  (e.g., a gNB). According to various embodiments, the electronic device  101  may transmit the reference signal through a plurality of power amplifiers (e.g., RFFE). For example, the electronic device  101  may configure the signal transmitted through the first antenna  811  or third antenna  813  to be processed through the first amplifier (e.g., first RFFE) and configure the signal transmitted through the second antenna  812  or fourth antenna  814  to be processed through the second amplifier (e.g., second RFFE). 
     According to various embodiments, the base station  820  may receive the reference signal transmitted from the electronic device  101  and may estimate the channel (ch.est.) for each antenna (e.g., the first antenna  811 , the second antenna  812 , the third antenna  813 , and the fourth antenna  814 ) of the electronic device  101  from the received reference signal. The base station  820  may transmit a beamformed signal to each antenna of the electronic device  101  based on the channel estimation. According to various embodiments, the base station  820  may set an MCS level for the uplink signal of the electronic device  101  based on the channel estimation and include configuration information about the set MCS level, as SRS resource indicator (SRI) information, in the downlink control information (DCI) and transmit it to the electronic device  101 . The electronic device  101  may determine the transmission power of a physical uplink shared channel (PUSCH) based on the parameter set for power control included in the SRI. 
     Although  FIG.  8    illustrates one power amplifier  815  and one switch  816  connected with a plurality of antennas (a first antenna  811 , a second antenna  812 , a third antenna  813 , and a fourth antenna  814 ) for ease of description, it will readily be appreciated by one of ordinary skill in the art that embodiments of the disclosure are not limited thereto. As an example, the electronic device  101  may further include components included in the electronic device  101  shown in  FIG.  1   . 
       FIG.  8    illustrates that the first antenna  811 , the second antenna  812 , the third antenna  813 , and the fourth antenna  814  are disposed outside the electronic device  101 , but this is for convenience of description. It will be appreciated by one of ordinary skill in the art that the first antenna  811 , the second antenna  812 , the third antenna  813 , and the fourth antenna  814  may be positioned inside the housing forming the exterior of the electronic device  101  and/or in at least a portion of the housing, and this is also applicable to other figures. 
     Referring to  FIG.  9   , the base station  820  may transmit the beamformed signal through an array antenna  821  including a plurality of (e.g., 32) antennas. The signal transmitted from the base station  820  may be received through each antenna (e.g., the first antenna  811 , the second antenna  812 , the third antenna  813 , and the fourth antenna  814 ) of the electronic device  101  and, as shown in  FIG.  9   , a signal in a beam shape directed by the beamforming of the base station  820  may be received by each antenna (e.g., the first antenna  811 , the second antenna  812 , the third antenna  813 , and the fourth antenna  814 ) of the electronic device  101 . 
     As illustrated in  FIGS.  8  and  9   , if the electronic device  101  transmits a reference signal (e.g., an SRS) through a plurality of transmission paths, the base station  820  may identify the channel environment with each antenna (e.g., the first antenna  811 , the second antenna  812 , the third antenna  813 , and the fourth antenna  814 )) of the electronic device  101  and perform beamforming, enhancing the reference signal received power (RSRP) and/or signal to noise ratio (SNR) of the downlink channel. If the RSRP and/or SNR of the downlink channel is enhanced, the rank index (RI) or channel quality indicator (CQI) for the electronic device may be increased. The base station  820  allocates a high rank or modulation and code schemes (MCS) to the electronic device  101  based on the enhanced performance of the electronic device  101  so that the downlink throughput of the electronic device  101  may be enhanced. 
     According to various embodiments, the base station  820  may use a downlink reference signal for downlink channel estimation. For example, if the base station  820  transmits the downlink reference signal to the electronic device  101 , the electronic device  101  may receive the downlink reference signal transmitted from the base station  820  and perform channel estimation. The electronic device  101  may transmit the result of channel estimation to the base station  820 , and the base station  820  may perform downlink beamforming with reference to the result of the channel estimation transmitted from the electronic device  101 . According to various embodiments, when the base station  820  performs channel estimation by the reference signal (e.g., an SRS) transmitted from the electronic device  101 , channel estimation may be performed faster than the channel estimation by the downlink reference signal, 
     According to various embodiments, a first communication network (e.g., a base station (gNB)) or a second communication network (e.g., a base station (eNB)) may send a request for various configuration information for the electronic device  101  by transmitting a UE capability enquiry message to the electronic device  101 . For example, a first communication network (e.g., a base station (gNB)) or a second communication network (e.g., a base station (eNB)) may send a request for information related to the reception antenna of the electronic device  101  through the UE capability enquiry message. The electronic device  101  may receive the UE capability enquiry message from the first communication network or the second communication network and, in response thereto, may transmit a UE capability information message to the first communication network or the second communication network. According to various embodiments, information related to the reception antenna of the electronic device  101 , such as ‘supportedSRS-TxPortSwitch t1r4’ or ‘supportedSRS-TxPortSwitch t2r4,’ may be included in the UE capability information message, according to the content of the UE capability enquiry message. 
     As the antenna-related information is specified as ‘supportedSRS-TxPortSwitch t1r4’ or ‘supportedSRS-TxPortSwitch t2r4,’ the first communication network may determine that the electronic device  101  may transmit signals using four reception antennas and transmit an RRC reconfiguration message including information for the time of transmission of a reference signal (e.g., an SRS) for each of the four antennas. 
       FIG.  10    is a flowchart illustrating a signal transmission/reception procedure between an example electronic device and a communication network according to various embodiments. Referring to  FIG.  10   , an electronic device  101  may establish an RRC connection with a first communication network (e.g., a base station (gNB))  1000  through a random access channel (RACH) procedure. 
     According to various embodiments, in operation  1010 , the first communication network  1000  may transmit an RRC reconfiguration message to the electronic device  101 . For example, the first communication network  1000  may transmit an RRC reconfiguration message in response to the RRC request message transmitted by the electronic device  101 . Referring to Table 5 below, information related to SRS antenna switching (e.g., SRS-ResourceSet) may be included in the RRC reconfiguration message. 
     
       
         
           
               
               
             
               
                   
                 TABLE 5 
               
               
                   
                   
               
             
            
               
                   
                 SRS-ResourceSet 
               
               
                   
                  srs-ResourceSetId: 1 
               
               
                   
                  srs-ResourceIdList: 4 items 
               
               
                   
                   Item 0 
               
               
                   
                    SRS-ResourceId: 1 
               
               
                   
                   Item: 1 
               
               
                   
                    SRS-ResourceId: 2 
               
               
                   
                   Item 2 
               
               
                   
                    SRS-ResourceId: 3 
               
               
                   
                   Item 3 
               
               
                   
                    SRS-ResourceId: 4 
               
               
                   
                  resourceType: periodic (2) 
               
               
                   
                   periodic 
               
               
                   
                  usage: antennaSwitching (3) 
               
               
                   
                  alpha: alpha1 (7) 
               
               
                   
                  p0: −62dBm 
               
               
                   
                  pathlossReferenceRS: ssb-Index (0) 
               
               
                   
                   sub-Index: 1 
               
               
                   
                   
               
            
           
         
       
     
     Further, the RRC reconfiguration message may include information regarding a time point at which the electronic device  101  transmits a reference signal (e.g., an SRS) through each antenna as shown in Table 6 below. 
     
       
         
           
               
               
             
               
                   
                 TABLE 6 
               
               
                   
                   
               
             
            
               
                   
                 perodicityAndOffset-p s120 : 17 
               
               
                   
                 perodicityAndOffset-p s120 : 7 
               
               
                   
                 perodicityAndOffset-p s120 : 13 
               
               
                   
                 perodicityAndOffset-p s120 : 3 
               
               
                   
                 nrofSymbols n1 
               
               
                   
                   
               
            
           
         
       
     
     Referring to the RRC reconfiguration message, it may be seen that as specified as “nrofSymbols n1”, the duration of SRS transmission may be determined as an allocated symbol. Further, referring to the RRC reconfiguration message, as specified as “periodicityAndOffset-p s120: 17”, the first SRS may be set to be transmit in the 17th slot while being transmitted once every 20 slots. As specified as “periodicityAndOffset-p s120: 7”, the second SRS may be set to be transmitted in the 7th slot while being transmitted once every 20 slots. As specified as “periodicityAndOffset-p s120: 13”, the third SRS is transmitted in the 13th slot while being transmitted once every 20 slots. As specified as “periodicityAndOffset-p s120: 3”, the fourth SRS is set to be transmitted in the 3rd slot while being transmitted once every 20 slots. According to various embodiments, the electronic device  101  may transmit four SRSs at different times through the respective antennas every 20 slots according to the configuration of RRC reconfiguration. The size of one slot may be determined by the subcarrier spacing (SCS). For example, when the SCS is 30 KHz, the time interval of one slot may be 0.5 ms, and the time interval of 20 slots may be 10 ms. Accordingly, the electronic device  101  may repeatedly transmit the SRS at different times through the respective antennas every 10 ms. According to various embodiments, one slot may include 14 symbols and, assuming that one symbol is allocated for one SRS transmission, it may have a symbol duration (or symbol enable time) of 0.5 ms*1/14=35 μs (0.035 ms). According to various embodiments, in operation  1020 , the electronic device  101  may transmit an RRC reconfiguration complete message to the first communication network  1000 . As the RRC reconfiguration procedure is normally completed, in operation  1030 , the electronic device  101  and the first communication network  1000  may complete RRC connection establishment. 
       FIG.  11    is a view illustrating an example transmission period of a reference signal according to various embodiments.  FIG.  12    is a view illustrating a concept of transmission of a reference signal by an example electronic device according to various embodiments. 
     Referring to  FIGS.  11  and  12   , e.g., a set number (e.g., four) of SRSs may be transmitted every set SRS transmission period (e.g., 10 ms, 20 ms, 40 ms, or 80 ms). As described above in connection with  FIG.  10   , when the electronic device (e.g., the electronic device  101  of  FIG.  1   ) is set to ‘1T4R’, the electronic device may transmit four SRS at different times through the respective antennas in 20 slots (e.g., 10 ms) every SRS transmission period (e.g., 10 ms, 20 ms, 40 ms, or 80 ms) according to the setting of the RRC reconfiguration. For example, the electronic device may transmit the first SRS (SRS  0 ) through the first antenna  811  (RX 0 ) (Ant.port 0 ) in the 17th slot among the 20 slots, transmit the second SRS (SRS  1 ) through the second antenna  812  (RX 1 ) (Ant.port 1 ) in the 7th slot, transmit the third SRS (SRS  2 ) through the third antenna  813  (RX 2 ) (Ant.port 2 ) in the 13th slot, and transmit the fourth SRS (SRS  3 ) through the fourth antenna  814  (RX 3 ) (Ant.port 3 ) in the third slot. 
     According to various embodiments, when the electronic device  101  is set to ‘2T4R’, the electronic device may transmit four SRS at different times through the respective antennas in 20 slots (e.g., 10 ms) every SRS transmission period (e.g., 10 ms, 20 ms, 40 ms, or 80 ms) according to the setting of the RRC reconfiguration. For example, at the first time, the electronic device  101  may transmit the first SRS (SRS  0 ) through the first antenna  811  (RX 0 ) (Ant.port 0 ) and transmit the second SRS (SRS  1 ) through the second antenna  812  (RX 1 ) (Ant.port 1 ). At the second time, the electronic device  101  may transmit the third SRS (SRS  2 ) through the third antenna  813  (RX 2 ) (Ant.port 2 ) and transmit the fourth SRS (SRS  3 ) through the fourth antenna  814  (RX 3 ) (Ant.port 3 ). 
     According to various embodiments, the reference signal may be a sounding reference signal (SRS) used for multi-antenna signal processing (e.g., multi input multi output (MIMO) or beamforming) through uplink channel state measurement, but embodiments of the disclosure are not limited thereto. For example, although SRS is used as an example of the reference signal in the above description or the following description, without being limited thereto, any type of uplink reference signal (e.g., uplink demodulation reference signal (DM-RS)) transmitted from the electronic device  101  to the base station signal may be included in the reference signal. 
     According to various embodiments, the electronic device  101  may transmit the SRS corresponding to each srs-Resource to the communication network through four different antennas, and the communication network may estimate the channel environment through the received SRS and determine layers. For example, when the channels estimated with the SRSs received from four antennas are all good, the communication network may configure four layers for the electronic device  101  and, if it is determined that the channel environments of some antennas are inappropriate, configure two layers or one layer. For example, when the communication network configures four layers and transmits data, the electronic device  101  may be required to operate with four layers or more layers to receive the data. 
     According to various embodiments, the electronic device  101  may lead the communication network to configure two layers so that the electronic device  101  operates in the 2Rx mode using the operation of the communication network. For example, the electronic device  101  may lead the communication network to determine that the channel state for the corresponding antenna is not good by transmitting a fake SRS, not a preset value, for two antennas which are not used as reception antennas or by transmitting no signal in the corresponding slot configured to transmit an SRS. In such a case, the communication network may configure two layers, not four layers, not to use the channel corresponding to the fake SRS but to transmit data through the channel determined to be good. As the communication network configures two layers, the electronic device  101  may switch from the 4Rx mode to 2Rx mode and operate. 
     According to various embodiments, if the electronic device  101  determines that call quality is not ensured, the electronic device  101  controls to transmit a normal RI or normal SRS, not the above-described fake RI or fake SRS, thereby leading the communication network to normally configure two layers or four layers. 
       FIG.  13    is a block diagram illustrating an example electronic device according to various embodiments. Referring to  FIG.  13   , according to various embodiments, an electronic device (e.g., the electronic device  101  of  FIG.  1   ) may include a communication processor  1320  (e.g., at least one of the first communication processor  212 , the second communication processor  214 , or the integrated communication processor  260 ), a processor  1321  (e.g., the processor  120 ), a temperature sensor  1322  (e.g., the sensor module  176 ), an RFIC  1310  (e.g., at least one of the first RFIC  222 , the second RFIC  224 , the third RFIC  226 , or the fourth RFIC  228 ), a first RFFE  1331 , a second RFFE  1332 , a first antenna  1341 , a second antenna  1342 , a third antenna  1343 , and a fourth antenna  1344 . The communication processor  1320  may control at least some of the RFIC  1310  or RFFEs  1331  and  1332  to adjust the number of antennas for reception. 
     According to various embodiments, upon transmission, the RFIC  1310  may convert a baseband signal generated by the communication processor  1320  into a radio frequency (RF) signal. For example, the RFIC  1310  may transmit an RF signal to the first antenna  1341  through the first RFFE  1331 . Alternatively, upon reception, the RFIC  1310  may convert an RF signal received from an RFFE (e.g., the first RFFE  1331  or the second RFFE  1332 ) into a baseband signal and provide it to the communication processor  1320 . The RFIC  1310  may include a component  1361  for transmission and components  1363 ,  1364 ,  1365 , and  1366  for reception. The first RFFE  1331  may include a component  1371  for transmission, components  1372  and  1373  for reception, and a switch  1374 . The switch  1374  may control the connection between each of the components  1371 ,  1372 , and  1373  and each of the antennas  1341  and  1342 . The second RFFE  1332  may include components  1381  and  1382  for reception and a switch  1383 . The switch  1383  may control the connection between each of the components  1381  and  1382  and each of the antennas  1343  and  1344 . Here, the first antenna  1341  may be used for both transmission and reception, and it may be named a PRX antenna. The second antenna  1342 , the third antenna  1343 , and the fourth antenna  1344  may be used for reception, and it may be named a DRX antenna. Meanwhile, the electronic device  101  may use a DRX antenna for SRS transmission. Although not shown, the electronic device  101  may further include a switching structure for applying an RF signal for SRS to the DRX antennas  1342 ,  1343 , and  1344 . For example, when the UE capability of the electronic device  101  is set to 1t4r, the electronic device  101  may sequentially (e.g., according to the SRS transmission timing) apply an RF signal to each of a first antenna  1341  that is a PRX antenna, and a second antenna  1342 , a third antenna  1343 , and a fourth antenna  1344  that are DRX antennas. For example, when the UE capability of the electronic device  101  is set to 1t2r, the electronic device  101  may sequentially (e.g., according to the SRS transmission timing) apply an RF signal to the first antenna  1341  that is a PRX antenna and any one of the DRX antennas. 
     For example, when the number of antennas for reception is set to four (e.g., set to the 4Rx mode), the communication processor  1320  may control at least some of the RFIC  1310  and the RFFEs  1331  and  1332  to allow communication to be performed through all of the first antenna  1341 , the second antenna  1342 , the third antenna  1343 , and the fourth antenna  1344 . For example, when it is determined that call quality is ensured in the VoNR call connected state as described above, the communication processor  1320  may perform a first operation for adjusting the number of antennas for reception. For example, the communication processor  1320  may adjust the number of antennas for reception to 2. In this case, the communication processor  1320  may control the RFIC  1310  and the second RFFE  1332  to disable a reception operation through the third antenna  1343  and the fourth antenna  1344 . In this case, at least some of the components  1365 ,  1366 ,  1381 , and  1382  and the switch  1383  may be controlled so that signals are not received from the antennas  1343  and  1344 . Or, the communication processor  1320  may adjust the number of antennas for reception to 1. In this case, the communication processor  1320  may control the RFIC  1310  and the RFFEs  1331  and  1332  to disable a reception operation through the second antenna  1342 , the third antenna  1343 , and the fourth antenna  1344 . In this case, at least some of the components  1364 ,  1365 ,  1366 ,  1381 , and  1382  and the switches  1374  and  1383  may be controlled so that signals are not received from the antennas  1342 ,  1343 , and  1344 . The electronic device  101  may decrease or increase the number of antennas for reception which are currently operating, and the number of antennas reduced or increased is not limited. 
       FIG.  14 A  is a flowchart illustrating operations of an example electronic device according to various embodiments. Referring to  FIG.  14 A , according to various embodiments, the electronic device  101  may make a call to or receive a call from an external electronic device. The electronic device  101  may perform a call setup procedure with the currently connected communication network. For example, the electronic device  101  (e.g., at least one of the processor  120 , the first communication processor  212 , the second communication processor  214 , or the integrated communication processor  260 ) may set up a VoNR call with an external electronic device through the 5G network  350  in a state connected to the 5G network  350  in operation  1410 . According to various embodiments, when both the electronic device  101  and the 5G network support VoNR, the VoNR call may be set up, and if any one does not support VoNR, the call may be connected through VoLTE by the EPS fallback described above in connection with  FIGS.  5  and  6   . The VoNR call setup procedure of operation  1410  may be performed as illustrated in  FIG.  14 B . 
       FIG.  14 B  is a flowchart illustrating operations of an example electronic device according to various embodiments. Referring to  FIG.  14 B , the electronic device  101  may register with the communication network  1400  (e.g., the 5G network  350  or the NR network) and, in operation  1411 , may register VoNR with the IMS server. For example, the VoNR registration may be performed through an IMS server. For example, the electronic device  101  may connect to the IMS server through the communication network  1400  to register VoNR for the electronic device  101 . For example, the electronic device  101  may transmit a registration request (e.g., a session initiation protocol (SIP) register) to the IMS server using at least one allocated address (e.g., IP address). The IMS server may register the electronic device  101  with the IMS server and provide a VoNR call service in response to the registration request. 
     According to various embodiments, according to the user&#39;s call request, the electronic device  101  (e.g., the transmitting terminal (MO terminal)) and the communication network  1400  may be switched from the RRC idle state to the RRC connected state. According to various embodiments, the electronic device  101  may transmit a SIP INVITE message to the IMS server through the communication network  1400  in operation  1412 . Although not shown in  FIG.  14 B , the communication network  1400  may transmit a paging signal to a receiving electronic device (e.g., an MT terminal). The receiving electronic device may be switched from the idle state to the active state according to the reception of the paging signal and may receive the SIP INVITE message sent from the transmitting electronic device  101 . The receiving electronic device may receive the SIP INVITE message and may transmit a SIP 180 RINGING message to the IMS server. As described above in connection with  FIG.  5   , the IMS server may transmit the SIP 180 RINGING message transmitted from the receiving electronic device to the electronic device  101 , which is the transmitting terminal, through the communication network  1400 . According to various embodiments, if the receiving electronic device (MT terminal) answers, a SIP 200 OK message may be transmitted to the IMS server. The IMS server  500  may transmit the SIP 200 OK message to the communication network  1400 , and the communication network  1400  may transmit the SIP 200 OK message to the electronic device  101  in operation  1413 . 
     According to various embodiments, the electronic device  101  may transmit an RRC reconfiguration message to the communication network  1400  in operation  1414 . The communication network  1400  may transmit a PDU session update command (PDU session modification command) to the electronic device  101  in operation  1415 . In response to receiving the PDU session update command, the electronic device  101  may transmit a PDU session update complete (PDU session modification complete) in operation  1416 . According to the completion of the RRC reconfiguration, the electronic device  101  may transmit an RRC reconfiguration complete message to the communication network  1400  in operation  1417 . Through the above procedure, the electronic device  101  may connect a VoNR call with the receiving electronic device through the communication network  1400 . 
     Referring back to  FIG.  14 A , in operation  1420 , the electronic device  101  may complete the VoNR call connection as described above in  FIG.  14 B . 
     According to various embodiments, the electronic device  101  may identify whether the call quality condition is met in a VoNR call connected state with the external electronic device in operation  1430 . For example, as described above in connection with  FIG.  7   , the electronic device  101  may identify whether the call quality condition is met by identifying information related to call quality. For example, the information related to the call quality may include at least one of signal to interference and noise ratio (SINR), reference signal received power (RSRP), block error rate (BLER), modulation and coding scheme (MCS), residual error, or real time protocol (RTP) packet non-received information. Embodiments of determining whether the call quality condition is met based on the information related to each call quality have been described in detail with reference to  FIG.  7   , and thus, a description thereof is not repeated here. 
     According to various embodiments, if it is determined that the call quality condition is not met based on the information related to the call quality (operation  1430 —NO), the electronic device  101  may maintain the existing setting and operate in operation  1460 . 
     According to various embodiments, if the electronic device  101  determines that the call quality condition is met based on the information related to the call quality (operation  1430 —YES) (e.g., if it is determined that the call quality is ensured), the electronic device  101  may determine whether a background download packet exists in operation  1440 . According to various embodiments, the existence of the background download packet may be determined based on a grant ratio. 
       FIG.  15    illustrates a concept of a grant ratio allocated to an example electronic device according to various embodiments. According to various embodiments, the grant ratio may be determined as shown in  FIG.  15   . Referring to  FIG.  15   , the grant ratio may indicate a ratio at which resource blocks are allocated on the time axis. In  FIG.  15   , the horizontal axis may denote the time axis, and the vertical axis may denote the frequency axis. In  FIG.  15   , one cell may represent one resource block (RB), but the disclosure is not limited in this respect. For example, one column along the horizontal axis in  FIG.  15    may represent one OFDM symbol, two or more OFDM symbols, or one slot including a plurality of OFDM symbols, but the disclosure is not limited in this respect. In the following description, for convenience of description, it may be assumed that one cell along the horizontal axis in  FIG.  15    is one slot including 14 OFDM symbols, and one cell along the vertical axis contains 12 subcarriers. For example, in the first slot  1501  of  FIG.  15   , 15 RBs out of a total of 19 RBs may be allocated for data transmission in the electronic device  101 . No single RB may be allocated to the second slot  1502 , the third slot  1503 , the sixth slot  1506 , the seventh slot  1507 , and the tenth slot  1510 . All of the 19 RBs may be allocated to the fourth slot  1504 , the fifth slot  1505 , and the eighth slot  1508 . Five RBs may be allocated to the ninth slot  1509 . Referring to  FIG.  15   , since at least one RB is allocated to 5 slots out of a total of 10 slots, the grant ratio may be calculated as 50% (5/10). 
     According to various embodiments, when the electronic device  101  is in the VoNR call connected state, downlink packets having a relatively small size are generated, but when data packets are downloaded in the background, the grant ratio may increase. For example, when the grant ratio is equal to or larger than a setting value (e.g., 20%), the electronic device  101  may determine that a background download packet exists. 
     According to various embodiments, when the electronic device  101  determines that the background download packet exists in operation  1440  (operation  1440 —YES), the electronic device  101  may maintain the existing setting and operate in operation  1460 . 
     According to various embodiments, when the electronic device  101  determines that no background download packet exists in operation  1440  (operation  1440 —NO), the electronic device  101  may perform at least one operation for reducing current consumption in operation  1450 . For example, the electronic device  101  may reduce current consumption by performing the operation of reducing the number of antennas for reception among the plurality of antennas (e.g., from 4Rx to 2Rx) based on identifying that the call quality-related information meets the designated condition in operation  1430  and identifying that no downlink packet exists in operation  1440 . According to various embodiments, the operation of reducing current consumption may be implemented in various manners other than reducing the number of antennas. For example, the electronic device  101  may reduce current consumption by limiting the overall bandwidth of the serving cell and reduce current consumption by reducing the number of CAs. 
     According to various embodiments, the electronic device  101  continues to meet the call quality condition in the VoNR call connected state, but when the grant ratio increases and exceeds a setting value (e.g., 20%), the electronic device  101  may determine that a background download packet exists and maintain the existing setting and operate in operation  1460 . For example, the number of antennas for reception may be maintained or increased again according to the existing setting. For example, as described above, the electronic device  101  may lead the communication network to configure four layers by transmitting a normal RI or normal SRS, rather than transmitting a fake RI or fake SRS to reduce the number of antennas for reception. As the communication network configures four layers, the electronic device  101  may switch from the 2Rx mode to 4Rx mode and operate. 
       FIG.  16    is a flowchart illustrating operations of an example electronic device according to various embodiments. Referring to  FIG.  16   , according to various embodiments, the electronic device  101  may make a call to or receive a call from an external electronic device. The electronic device  101  may perform a call setup procedure with the currently connected communication network. For example, the electronic device  101  (e.g., at least one of the processor  120 , the first communication processor  212 , the second communication processor  214 , or the integrated communication processor  260 ) may set up a VoNR call with an external electronic device through the 5G network  350  in a state connected to the 5G network  350  and complete the call setup in operation  1602 . The VoNR call setup procedure may be performed as described above in connection with  FIGS.  14 A and  14 B . 
     According to various embodiments, the electronic device  101  may identify whether the call quality condition is met in a VoNR call connected state with the external electronic device in operation  1604 . For example, as described above in connection with  FIG.  7   , the electronic device  101  may identify whether the call quality condition is met by identifying information related to call quality. For example, the information related to the call quality may include at least one of signal to interference and noise ratio (SINR), reference signal received power (RSRP), block error rate (BLER), modulation and coding scheme (MCS), residual error, or real time protocol (RTP) packet non-received information. Embodiments of determining whether the call quality condition is met based on the information related to each call quality have been described in detail with reference to  FIG.  7   , and thus, a description thereof is not repeated here. 
     According to various embodiments, if it is determined that the call quality condition is not met based on the information related to the call quality (operation  1604 —NO), the electronic device  101  may maintain the existing setting and operate in operation  1612 . 
     According to various embodiments, if the electronic device  101  determines that the call quality condition is met based on the information related to the call quality (operation  1604 —YES) (e.g., if it is determined that the call quality is ensured), the electronic device  101  may determine whether it is in an overheat (over-temperature) state in operation  1606 . For example, the electronic device  101  may include a temperature sensor (e.g., the sensor module  176  of  FIG.  1    or the temperature sensor  1322  of  FIG.  13   ) for measuring the temperature inside (or on the surface) the electronic device  101 . The electronic device  101  may identify an indication indicating, as an over-temperature state, an over-temperature indicating that the measured temperature is equal to or larger than a threshold temperature. The temperature measured to identify the over-temperature state may include, for example, the temperature measured at at least one of the processor  120 , the first communication processor  212 , the second communication processor  214 , the integrated communication processor  260 , the first RFIC  222 , the second RFIC  224 , the third RFIC  226 , the fourth RFIC  228 , the first RFFE  232 , the second RFFE  234 , or the third RFFE  236 . 
     According to various embodiments, the electronic device  101  (e.g., at least one of the processor  120 , the first communication processor  212 , the second communication processor  214 , or the integrated communication processor  260 ) may identify the indication indicating the over-temperature and identify whether it is in the over-temperature state. For example, the processor  120  may obtain temperature information from the sensor module  176 . For example, the processor  120  may determine whether the obtained temperature information is equal to or larger than a designated threshold temperature (e.g., 43° C.). When the obtained temperature information is the designated threshold temperature or more, the processor  120  may provide the indication indicating the over-temperature to the communication processor (e.g., at least one of the first communication processor  212 , the second communication processor  214 , or the integrated communication processor  260 ). In an embodiment, the communication processor (e.g., at least one of the first communication processor  212 , the second communication processor  214 , or the integrated communication processor  260 ) may directly obtain the temperature information from the temperature sensor (e.g., the sensor module  176  of  FIG.  1    or the temperature sensor  1322  of  FIG.  13   ). In this case, it may be identified whether it is in the over-temperature state by determining whether the temperature information obtained by the communication processor (e.g., at least one of the first communication processor  212 , the second communication processor  214 , or the integrated communication processor  260 ) is the designated threshold temperature or more. 
     According to various embodiments, if the electronic device  101  identifies that it is not in the over-temperature state in operation  1606  (e.g., when the indicator indicating the over-temperature is not received or when the obtained temperature information is less than the designated threshold temperature), the electronic device  101  may determine whether a background downlink packet exists in operation  1610 . According to various embodiments, the existence of the background download packet may be determined based on a grant ratio as described above. 
     According to various embodiments, when the electronic device  101  is in the VoNR call connected state, downlink packets having a relatively small size are generated, but when data packets are downloaded in the background, the grant ratio may increase. For example, when the grant ratio is equal to or larger than a setting value (e.g., 20%), the electronic device  101  may determine that a background download packet exists. 
     According to various embodiments, when the electronic device  101  determines that the background download packet exists in operation  1610  (operation  1610 —YES), the electronic device  101  may maintain the existing setting and operate in operation  1612 . 
     According to various embodiments, when the electronic device  101  determines that no background download packet exists in operation  1610  (operation  1610 —NO), the electronic device  101  may perform at least one operation for reducing current consumption in operation  1608 . For example, the electronic device  101  may reduce current consumption by performing the operation of reducing the number of antennas for reception among the plurality of antennas (e.g., from 4Rx to 2Rx) based on identifying that the call quality-related information meets the designated condition in operation  1604 , identifying that it is not in the over-temperature state in operation  1606 , and identifying that no downlink packet exists in operation  1610 . According to various embodiments, the operation of reducing current consumption may be implemented in various manners other than reducing the number of antennas. For example, the electronic device  101  may reduce current consumption by limiting the overall bandwidth of the serving cell and reduce current consumption by reducing the number of CAs. 
     According to various embodiments, when the electronic device  101  identifies that it is in the over-temperature state in the operation  1606  (e.g., when an indicator indicating the over-temperature is received or when the obtained temperature information is equal to or larger than the designated threshold temperature) (operation  1606 —YES), the electronic device  101  may perform at least one operation for reducing current consumption in operation  1608  irrespective of the existence of the background download packet. 
       FIG.  17    is a flowchart illustrating operations of an example electronic device according to various embodiments. Referring to  FIG.  17   , according to various embodiments, the electronic device  101  may make a call to or receive a call from an external electronic device. The electronic device  101  may perform a call setup procedure with the currently connected communication network. For example, the electronic device  101  (e.g., at least one of the processor  120 , the first communication processor  212 , the second communication processor  214 , or the integrated communication processor  260 ) may set up a VoNR call with an external electronic device through the 5G network  350  in a state connected to the 5G network  350  in operation  1702 . According to various embodiments, when both the electronic device  101  and the 5G network support VoNR, the VoNR call may be set up, and if any one does not support VoNR, the call may be connected through VoLTE by the EPS fallback described above in connection with  FIGS.  5  and  6   . 
     According to various embodiments, in operation  1704 , the electronic device  101  may complete the VoNR call connection as described above in  FIG.  14 B . 
     According to various embodiments, the electronic device  101  may determine whether it is in the over-temperature state in operation  1706 . For example, the processor  120  may obtain temperature information from the sensor module  176 . The processor  120  may determine whether the obtained temperature information is equal to or larger than a designated threshold temperature (e.g., 43° C.). When the obtained temperature information is the designated threshold temperature or more, the processor  120  may provide the indication indicating the over-temperature to the communication processor (e.g., at least one of the first communication processor  212 , the second communication processor  214 , or the integrated communication processor  260 ). The communication processor may identify being in the over-temperature state based on receiving the indication indicating the over-temperature. 
     According to various embodiments, if the electronic device  101  identifies that it is not in the over-temperature state in operation  1706  (e.g., when the indicator indicating the over-temperature is not received or when the obtained temperature information is less than the designated threshold temperature) (operation  1706 —NO), the electronic device  101  may perform a VoNR call according to the existing setting. 
     According to various embodiments, when the electronic device  101  identifies that it is in the over-temperature state in the operation  1706  (e.g., when an indicator indicating the over-temperature is received or when the obtained temperature information is equal to or larger than the designated threshold temperature) (operation  1706 —YES), the electronic device  101  may identify the operation set in response to the over-temperature state in operation  1708 . For example, the operation set in response to the over-temperature state may include at least one of updating UE capability, reducing the number of reception antennas, limiting the maximum transmission power, or switching RATs, but the various embodiments are not limited in this respect. 
     According to various embodiments, upon identifying that the operation set in response to the over-temperature state is RAT switching in operation  1710  (operation  1710 —YES), the electronic device  101  may perform RAT switching by handing over to the LTE network in operation  1712 . For example, the handover to the LTE network may be performed as the electronic device  101  transmits a fake measurement report (MR) to the communication network. For example, inter-RAT handover may require that the signal strength of the serving RAT be less than or equal to a first threshold (threshold 1 ) and the signal strength of the target RAT be larger than or equal to a second threshold (threshold 2 ). To induce handover to the LTE network (e.g., N2L handover), the electronic device  101  may transmit a fake MR indicating that the signal strength of the serving RAT is equal to or smaller than the first threshold, thus allowing the communication network to lead the electronic device  101  to hand over to the LTE network. 
     According to various embodiments, upon identifying that the operation set in response to the over-temperature state is not RAT switching in operation  1710  (operation  1710 —NO) (e.g., upon identifying at least one of updating UE capability, reducing the number of reception antennas, or limiting the maximum transmission power), the electronic device  101  may control to refrain from the operation set in response to the over-temperature state in operation  1714 . For example, in a case in which the operation set in response to the over-temperature state is updating the UE capability, even when the over-temperature state is identified, the electronic device  101  may control to refrain from the operation of updating the UE capability in the VoNR call connected state. In a case in which the operation set in response to the over-temperature state is reducing the number of reception antennas, even when the over-temperature state is identified, the electronic device  101  may control to refrain from the operation for reducing the number of reception antenna in the VoNR call connected state. In a case in which the operation set in response to the over-temperature state is limiting the maximum transmission power, even when the over-temperature state is identified, the electronic device  101  may control to refrain from the operation for limiting the maximum transmission power in the VoNR call connected state. According to various embodiments, the electronic device  101  may control to refrain from only the operation for reducing the number of reception antennas among the operations set in response to the over-temperature state but to perform other operations (e.g., updating the UE capability or limiting the maximum transmission power). 
     According to various embodiments, when the VoNR call is not terminated in operation  1716  (operation  1716 —NO), the electronic device  101  may continue to perform the control of operation  1714 . When the VoNR call is terminated in operation  1716  (operation  1716 —YES), the electronic device  101  may control to perform the operation set in response to the over-temperature state (e.g., when it is identified as at least one of updating the UE capability, reducing the number of reception antennas, or limiting the maximum transmission power) in operation  1718 . 
       FIG.  18    is a flowchart illustrating operations of an example electronic device according to various embodiments. Referring to  FIG.  18   , according to various embodiments, the electronic device  101  (e.g., at least one of the processor  120 , the first communication processor  212 , the second communication processor  214 , or the integrated communication processor  260 ) may connect with the 5G network via SA in operation  1802 . 
     According to various embodiments, the electronic device  101  may identify whether it is in the over-temperature state in operation  1804 . For example, the processor  120  may obtain temperature information from the sensor module  176 . The processor  120  may determine whether the obtained temperature information is equal to or larger than a designated threshold temperature (e.g., 43° C.). When the obtained temperature information is the designated threshold temperature or more, the processor  120  may provide the indication indicating the over-temperature to the communication processor (e.g., at least one of the first communication processor  212 , the second communication processor  214 , or the integrated communication processor  260 ). The communication processor may identify being in the over-temperature state based on receiving the indication indicating the over-temperature. 
     According to various embodiments, if the electronic device  101  identifies that it is not in the over-temperature state in operation  1804  (e.g., when the indicator indicating the over-temperature is not received or when the obtained temperature information is less than the designated threshold temperature) (operation  1804 —NO), the electronic device  101  may maintain the connection with the 5G network according to the existing setting. 
     According to various embodiments, when the electronic device  101  identifies that it is in the over-temperature state in the operation  1804  (e.g., when an indicator indicating the over-temperature is received or when the obtained temperature information is equal to or larger than the designated threshold temperature) (operation  1804 —YES), the electronic device  101  may control to perform the operation set in response to the over-temperature state (e.g., when it is identified as at least one of updating the UE capability, reducing the number of reception antennas, or limiting the maximum transmission power) in operation  1806 . 
     According to various embodiments, upon identifying that the VoNR call is not connected in operation  1808  (operation  1808 —NO), the electronic device  101  may control to continue to perform the operation set in response to the over-temperature state of operation  1806  until the over-temperature state is released. According to various embodiments, upon identifying that the VoNR call is connected in operation  1808  (operation  1808 —YES), the electronic device  101  may control to refrain from the operation set in response to the over-temperature state in operation  1810 . For example, in a case in which the operation set in response to the over-temperature state is updating the UE capability, even when the over-temperature state is identified, the electronic device  101  may control to refrain from the operation of updating the UE capability in the VoNR call connected state. In a case in which the operation set in response to the over-temperature state is reducing the number of reception antennas, even when the over-temperature state is identified, the electronic device  101  may control to refrain from the operation for reducing the number of reception antenna in the VoNR call connected state. In a case in which the operation set in response to the over-temperature state is limiting the maximum transmission power, even when the over-temperature state is identified, the electronic device  101  may control to refrain from the operation for limiting the maximum transmission power in the VoNR call connected state. According to various embodiments, the electronic device  101  may control to refrain from only the operation for reducing the number of reception antennas among the operations set in response to the over-temperature state but to perform other operations (e.g., updating the UE capability or limiting the maximum transmission power). 
     According to various embodiments, when the VoNR call is not terminated in operation  1812  (operation  1812 —NO), the electronic device  101  may continue to perform the control of operation  1810 . When the VoNR call is terminated in operation  1812  (operation  1812 —YES), the electronic device  101  may control to perform the operation set in response to the over-temperature state (e.g., when it is identified as at least one of updating the UE capability, reducing the number of reception antennas, or limiting the maximum transmission power) in operation  1814 . 
       FIG.  19    is a flowchart illustrating operations of an example electronic device according to various embodiments. Referring to  FIG.  19   , according to various embodiments, the electronic device  101  (e.g., at least one of the processor  120 , the first communication processor  212 , the second communication processor  214 , or the integrated communication processor  260 ) may register with the communication network  1400  (e.g., the 5G network  350  or NR network) and, in operation  1902 , register VoNR with the IMS server. The VoNR registration procedure may be performed as described above in connection with  1411  of  FIG.  14 B . 
     According to various embodiments, the electronic device  101  may make a call to or receive a call from an external electronic device. The electronic device  101  may perform a call setup procedure with the currently connected communication network. For example, the electronic device  101  (e.g., at least one of the processor  120 , the first communication processor  212 , the second communication processor  214 , or the integrated communication processor  260 ) may set up a VoNR call with an external electronic device through the 5G network  350  in a state connected to the 5G network  350  in operation  1904 . According to various embodiments, when both the electronic device  101  and the 5G network support VoNR, the VoNR call may be set up, and if any one does not support VoNR, the call may be connected through VoLTE by the EPS fallback described above in connection with  FIGS.  5  and  6   . 
     According to various embodiments, the electronic device  101  may identify whether it is in the over-temperature state in operation  1906 . For example, the processor  120  may obtain temperature information from the sensor module  176 . The processor  120  may determine whether the obtained temperature information is equal to or larger than a designated threshold temperature (e.g., 43° C.). When the obtained temperature information is the designated threshold temperature or more, the processor  120  may provide the indication indicating the over-temperature to the communication processor (e.g., at least one of the first communication processor  212 , the second communication processor  214 , or the integrated communication processor  260 ). The communication processor may identify being in the over-temperature state based on receiving the indication indicating the over-temperature. 
     According to various embodiments, if the electronic device  101  identifies that it is not in the over-temperature state in operation  1906  (e.g., when the indicator indicating the over-temperature is not received or when the obtained temperature information is less than the designated threshold temperature) (operation  1906 —NO), the electronic device  101  may continuously perform the VoNR call connection according to the existing setting in operation  1914 . 
     According to various embodiments, when the electronic device  101  identifies that it is in the over-temperature state in the operation  1906  (e.g., when an indicator indicating the over-temperature is received or when the obtained temperature information is equal to or larger than the designated threshold temperature) (operation  1906 —YES), the electronic device  101  may identify whether RATs are switched (e.g., handover to the LTE network) in operation  1908 . 
     According to various embodiments, if it is determined that the RAT switching is not performed in operation  1908  (operation  1908 —NO), the electronic device  101  may continue to perform the VoNR call connection according to the existing setting in operation  1914 . According to various embodiments, if the electronic device  101  determines that RAT switching is performed in operation  1908  (operation  1908 —YES), the electronic device  101  may identify whether the VoNR call to be currently connected is a transmission call (e.g., mobile oriented (MO) call) or a reception call (e.g., mobile terminated (MT) call) in operation  1910 . 
     According to various embodiments, when the VoNR call is the MT call, not the MO call (operation  1910 —NO), the electronic device  101  may perform VoNR call connection in operation  1916  and then, in operation  1918 , perform RAT switching to the LTE network. According to various embodiments, if the VoNR call is the MO call, not the MT call (operation  1910 —YES), the electronic device  101  may perform RAT switching to the LTE network in operation  1912  and then, in operation  1914 , perform VoNR call connection. A VoNR call connection procedure on the above-described MO call and MT call is described below with reference to  FIGS.  20  and  21   . 
       FIG.  20    is a flowchart illustrating operations of an example electronic device according to various embodiments. Referring to  FIG.  20   , according to various embodiments, the electronic device  101  (e.g., at least one of the processor  120 , the first communication processor  212 , the second communication processor  214 , or the integrated communication processor  260 ) may register with the 5G network  350  and register VoNR with the IMS server through the 5G network  350  in operation  2002 . The VoNR registration procedure may be performed as described above in connection with  1411  of  FIG.  14 B . 
     According to various embodiments, the electronic device  101  may identify that it is in an over-temperature state and may trigger LTE fallback in response to an over-temperature state in operation  2004 . A description of identifying whether it is in the over-temperature state has been described above in connection with  FIGS.  17  and  18   , and the description is not repeated here. According to the triggering of the LTE fallback, the electronic device  101  may start a handover procedure from the 5G network  350  to the LTE network  340  in operation  2006 . 
     According to various embodiments, when starting the handover procedure, the electronic device  101  may identify an outgoing call for making a call to the external electronic device in operation  2008 . Although the electronic device  101  should transmit the SIP INVITE message in response to the outgoing call, according to various embodiments, in operation  2010 , the electronic device  101  may control to refrain from or suspend the transmission of the SIP INVITE message. 
     According to various embodiments, the electronic device  101  may complete the handover procedure from the 5G network  350  to the LTE network  340  in operation  2012 . As the handover procedure is completed, the electronic device  101  may perform the suspended SIP INVITE message transmission in operation  2014 . The receiving electronic device may receive the SIP INVITE message transmitted from the electronic device  101  and may transmit a SIP 180 RINGING message. According to various embodiments, if the receiving electronic device answers, a SIP 200 OK message may be transmitted to the IMS server. The IMS server may transmit the SIP 200 OK message to the electronic device  101  through the LTE network  340  in operation  2016 . 
     According to various embodiments, the LTE network  340  may transmit an active EPS bearer context request message to the electronic device  101  in operation  2018 . In response to receiving the active EPS bearer context request message, the electronic device  101  may transmit an active EPS bearer context accept message to the LTE network  340  in operation  2020 . According to the above procedure, in operation  2022 , the electronic device  101  may complete the VoLTE call connection through the LTE network  340 . 
       FIG.  21    is a flowchart illustrating operations of an example electronic device according to various embodiments. Referring to  FIG.  21   , according to various embodiments, the electronic device  101  (e.g., at least one of the processor  120 , the first communication processor  212 , the second communication processor  214 , or the integrated communication processor  260 ) may register with the 5G network  350  and register VoNR with the IMS server through the 5G network  350  in operation  2102 . The VoNR registration procedure may be performed as described above in connection with  1411  of  FIG.  14 B . 
     According to various embodiments, the electronic device  101  may receive a paging in operation  2104  and may receive the SIP INVITE message transmitted from the counterpart electronic device in operation  2106 . 
     According to various embodiments, when receiving the SIP INVITE message and before transmitting a SIP 200 OK message, the electronic device  101  may identify that it is in an over-temperature state and may trigger LTE fallback in response to an over-temperature state in operation  2108 . A description of identifying whether it is in the over-temperature state has been described above in connection with  FIGS.  17  and  18   , and the description is not repeated here. Despite the triggering of the LTE fallback, the electronic device  101  may control to refrain from or suspend the LTE fallback operation. 
     According to various embodiments, after suspending the LTE fallback operation, the electronic device  101  may transmit a SIP 200 OK message to the receiving electronic device through the 5G network  350  in operation  2112 . The 5G network  350  may transmit a PDU session update command (PDU session modification command) to the electronic device  101  in operation  2114 . In response to receiving the PDU session update command, the electronic device  101  may transmit a PDU session update complete to the 5G network  350  in operation  2116 . According to the above procedure, in operation  2118 , the electronic device  101  may start VoNR through the 5G network  350 . 
     According to various embodiments, after the VoNR call is started, the electronic device  101  may resume the suspended LTE handover procedure in operation  2120 . According to the above procedure, in operation  2122 , the electronic device  101  may complete the VoLTE call connection through the LTE network  340 . 
       FIG.  22    is a flowchart illustrating operations of an example electronic device according to various embodiments. Referring to  FIG.  22   , according to various embodiments, the electronic device  101  (e.g., at least one of the processor  120 , the first communication processor  212 , the second communication processor  214 , or the integrated communication processor  260 ) may connect with the 5G network via SA in operation  2202 . 
     According to various embodiments, the electronic device  101  may determine whether a low power mode (LPM) is met in operation  2204 . For example, the low power mode refers, for example, to a context in which power consumption of the electronic device  101  is to be reduced and may include, but is not limited to, is at least one of a heat generation context (e.g., over-temperature state), a context in which the display is turned off, or a context in which the battery level is a set value or less. For example, the over-temperature state may be identified based on receiving an indication indicating over-temperature by the communication processor when the temperature information obtained by the processor  120  is the designated threshold temperature (e.g., 43° C.) or more. 
     According to various embodiments, the electronic device  101  may identify information related to the bandwidth (BW) or partial bandwidth (BWP) in operation  2206 . For example, the bandwidth-related information may be identified through SIB 1 of Table 7 below. 
     
       
         
           
               
               
             
               
                   
                 TABLE 7 
               
               
                   
                   
               
             
            
               
                   
                 systemInformationBlockType1 
               
               
                   
                 servingCellConfigCommon 
               
               
                   
                  downlinkConfigCommon 
               
               
                   
                   frequencyInfoDL 
               
               
                   
                    frequencyBandList: 1 item 
               
               
                   
                     Item 0 
               
               
                   
                      NR-MultiBandInfo 
               
               
                   
                       freqBandIndicatorNR: 78 
               
               
                   
                       nr-NS-PmaxList: 1 item 
               
               
                   
                        Item 0 
               
               
                   
                         NR-NS-PmaxValue 
               
               
                   
                          additionalSpectrumEmission: 0 
               
               
                   
                    offsetToPointA: 2 PRBs 
               
               
                   
                    scs-SpecificCarrierList: 1 item 
               
               
                   
                     Item 0 
               
               
                   
                      SCS-SpecificCarrier 
               
               
                   
                       offsetToCarrier: 0 
               
               
                   
                       subcarrierSpacing: kHz30 (1) 
               
               
                   
                       carrierBandwidth: 273 
               
               
                   
                   
               
            
           
         
       
     
     Referring to Table 7, it may be identified that carrierBandwidth is set to 273, and it may be identified that the bandwidth corresponding to carrierBandwidth of 273 is 100 MHz and SCS is 30 kHz by Table 8 below. 
     
       
         
           
               
               
             
               
                   
                 TABLE 8 
               
             
            
               
                   
                   
               
               
                   
                 SCS (kHz) 
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                   
                 5M 
                 10M 
                 15M 
                 20M 
                 25M 
                 30M 
                 40M 
                 50M 
                 60M 
                 70M 
                 80M 
                 90M 
                 100M 
               
               
                   
                 N RB   
                 N RB   
                 N RB   
                 N RB   
                 N RB   
                 N RB   
                 N RB   
                 N RB   
                 N RB   
                 N RB   
                 N RB   
                 N RB   
                 N RB   
               
               
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                 15 
                 25 
                 52 
                 79 
                 106 
                 133 
                 160 
                 216 
                 270 
                 N/A 
                 N/A 
                 N/A 
                 N/A 
                 N/A 
               
               
                 30 
                 11 
                 24 
                 38 
                 51 
                 65 
                 78 
                 106 
                 133 
                 162 
                 189 
                 217 
                 245 
                 273 
               
               
                   
               
            
           
         
       
     
     Information related to the partial bandwidth (BWP) may be identified through the RRC reconfiguration message of Table 9 below. 
     
       
         
           
               
               
             
               
                   
                 TABLE 9 
               
               
                   
                   
               
             
            
               
                   
                 rrcReconfiguration 
               
               
                   
                 spCellConfig 
               
               
                   
                  spCellConfigDedicated 
               
               
                   
                   downlinkBWP-ToAddModList: 1 item 
               
               
                   
                    Item 0 
               
               
                   
                     BWP-Downlink 
               
               
                   
                      bwp-Id: 1 
               
               
                   
                      bwp-Common 
               
               
                   
                       genericParameters 
               
               
                   
                        locationAndBandwidth: 31624 
               
               
                   
                        subcarrierSpacing: kHz30 (1) 
               
               
                   
                 ... 
               
               
                   
                 firstActiveDownlinkBWP-Id: 1 
               
               
                   
                   
               
            
           
         
       
     
     Referring to Table 9, it may be identified that locationAndBandwidth is set to 31624, and it may identify that the partial bandwidth corresponding to locationAndBandwidth of 31624 is 60 MHz by Table 10 below. 
                                     TABLE 10               CBW   max RB   Equation   RIV Calculation   locationAndBandwidth                                                    5   11   (1)   275*(11 − 1) + 0   2750       10   24   (1)   275*(24 − 1) + 0   6325       15   38   (1)   275*(38 − 1) + 0   10175       20   51   (1)   275*(51 − 1) + 0   13750       25   65   (1)   275*(65 − 1) + 0   17600       30   78   (1)   275*(78 − 1) + 0   21175       40   106   (1)   275*(106 − 1) + 0   28875       50   133   (1)   275*(133 − 1) + 0   36300       60   162   (2)   275*(275 − 162 + 1) + (275 − 1 − 0)   31624       70   189   (2)   275*(275 − 189 + 1) + (275 − 1 − 0)   24199       80   217   (2)   275*(275 − 217 + 1) + (275 − 1 − 0)   16499       90   245   (2)   275*(275 − 245 + 1) + (275 − 1 − 0)   8799       100   273   (2)   275*(275 − 273 + 1) + (275 − 1 − 0)   1099                    
When “downlinkBWP-ToAddModList” is not included in the RRC reconfiguration message of Table 9, the corresponding electronic device  101  may determine that the BWP is not supported during a VoNR call.
 
     According to various embodiments, the electronic device  101  may perform at least one operation to disable VoNR based on identifying that the bandwidth- or bandwidth part-related information meets a designated condition in operation  2208 . For example, based on identifying that the NR bandwidth of the serving cell exceeds a first threshold based on the bandwidth-related information, the electronic device  101  may perform at least one operation for disabling VoNR. As exemplified in the above-described Table 3, the current consumed during a VoNR call may vary depending on the bandwidth. For example, in the case of LTE, since the maximum bandwidth of 1 carrier component (CC) is 20 MHz, a larger NR bandwidth value than a current simulation value consumed at VoLTE 20 MHz may be set as the first threshold. When the NR bandwidth of the current serving cell is equal to or larger than the first threshold, the electronic device  101  may perform EPS fallback because it consumes less current to perform a VoLTE call through EPS fallback. 
     According to various embodiments, the communication network may allocate only a partial bandwidth to the electronic device  101  using a partial bandwidth (BWP) during a VoNR call to reduce power consumption. For example, since VoNR is not a function that requires a wide bandwidth, when the bandwidth of 1 CC is relatively large, the communication network may reduce the current consumption of the electronic device  101  by allocating only a bandwidth smaller than the bandwidth of the 1 CC. According to various embodiments, to identify whether the communication network supports VoNR, it may be identified whether a separate BWP is allocated when a VoNR call is connected. For example, it consumes less current to connect a VoNR call through EPS fallback when the communication network does not support BWP, so that the VoNR capability setting may be disabled. According to various embodiments, even when the communication network allocates the BWP to the electronic device  101 , if the set bandwidth identified through the BWP setting is larger than a second threshold, the VoNR capability setting may be disabled. 
     According to various embodiments, as described above in connection with Table 2, the electronic device  101  may set the “NG-RAN Radio Capability Update” in the registration request message to 1 and transmit it to the communication network, thereby notifying the communication network that the UE capability information needs to be updated. The communication network may identify that the electronic device  101  needs to update the UE capability through the registration request message transmitted from the electronic device  101 . The communication network may transmit a UE capability enquiry message to the electronic device  101  to identify the UE capability update information. The electronic device  101  may receive the UE capability enquiry message from the communication network and transmit UE capability information including the updated information to the communication network. As described above, the UE capability information may include information regarding whether the electronic device  101  supports VoNR. According to various embodiments, the electronic device  101  may update “voiceOverNR” in the above-described Table 1 to “not supported” or “0”, and transmit it to the communication network so that a call connection in the communication network is made via VoLTE through EPS fallback, not via VoNR. 
     According to various embodiments, if the electronic device  101  determines that it is inefficient to update UE capability information to VoNR not supported, the electronic device  101  does not update the UE capability information, but switches to LTE only during call origination and then attempts to make a VoNR call. For example, even when the “NG-RAN Radio Capability Update” value is set to 1, if the communication network does not inquire about UE capability information or if it is determined that transmission of a registration request for UE capability update may fail due to poor NR signal strength, the electronic device  101  may switch to LTE only upon call origination and then attempt to make a VoLTE call. 
       FIG.  23    is a flowchart illustrating operations of an example electronic device according to various embodiments. Referring to  FIG.  23   , according to various embodiments, the electronic device  101  (e.g., at least one of the processor  120 , the first communication processor  212 , the second communication processor  214 , or the integrated communication processor  260 ) may connect with the 5G network via SA in operation  2301 . 
     According to various embodiments, the electronic device  101  may determine whether a low power mode (LPM) is met (identified) in operation  2302 . For example, the low power mode refers, for example, to a context in which power consumption of the electronic device  101  is to be reduced and may include, but is not limited to, is at least one of a heat generation context (e.g., over-temperature state), a context in which the display is turned off, or a context in which the battery level is a set value or less. For example, the over-temperature state may be identified based on receiving an indication indicating over-temperature by the communication processor when the temperature information obtained by the processor  120  is the designated threshold temperature (e.g., 43° C.) or more. 
     According to various embodiments, the electronic device  101  may identify whether it is making a VoNR call in operation  2304 . If it is identified that it is making a VoNR call (operation  2304 —YES), the electronic device  101  may perform handover to the LTE network in operation  2312 . For example, the handover to the LTE network may be performed as the electronic device  101  transmits a fake measurement report (MR) to the communication network. For example, inter-RAT handover may require that the signal strength of the serving RAT be less than or equal to a first threshold (threshold 1 ) and the signal strength of the target RAT be larger than or equal to a second threshold (threshold 2 ). To induce handover to the LTE network (e.g., N2L handover), the electronic device  101  may transmit a fake MR indicating that the signal strength of the serving RAT is equal to or smaller than the first threshold, thus allowing the communication network to lead the electronic device  101  to hand over to the LTE network. 
     If it is identified that it is not making a VoNR call in operation  2304  (operation  2304 —NO), the electronic device  101  may identify whether the bandwidth of the serving cell exceeds the first threshold in operation  2306 . For example, the bandwidth-related information may be identified through the above-described Tables 7 and 8. As a result of the identification in operation  2306 , if the bandwidth of the serving cell does not exceed the first threshold (operation  2306 —NO), the VoNR enabled state may be maintained. 
     According to various embodiments, as a result of the identification in operation  2306 , if the bandwidth of the serving cell exceeds the first threshold (operation  2306 —YES), the electronic device  101  may identify whether the BWP is supported during a VoNR call in operation  2308 . Whether the electronic device  101  supports the BWP during a VoNR call may be identified through information about whether BWP is supported (e.g., downlinkBWP-ToAddModList) in the RRC reconfiguration message of Table 9 as described above. For example, as described above, when “downlinkBWP-ToAddModList” is not included in the RRC reconfiguration message of Table 9, the corresponding electronic device  101  may determine that the BWP is not supported during a VoNR call. 
     According to various embodiments, as a result of the identification in operation  2308 , if it is identified that the electronic device  101  supports BWP during a VoNR call (operation  2308 —YES), the VoNR enabled state may be maintained. As a result of the identification in operation  2308 , if it is identified that the electronic device  101  does not support BWP during a VoNR call (operation  2308 —NO), the electronic device  101  may perform at least one operation for disabling VoNR in operation  2310 . For example, as described above in connection with Table 2, the electronic device  101  may set the “NG-RAN Radio Capability Update” in the registration request message to 1 and transmit it to the communication network, thereby notifying the communication network that the UE capability information needs to be updated. The communication network may identify that the electronic device  101  needs to update the UE capability through the registration request message transmitted from the electronic device  101 . The communication network may transmit a UE capability enquiry message to the electronic device  101  to identify the UE capability update information. The electronic device  101  may receive the UE capability enquiry message from the communication network and transmit UE capability information including the updated information to the communication network. As described above, the UE capability information may include information regarding whether the electronic device  101  supports VoNR. According to various embodiments, the electronic device  101  may update “voiceOverNR” in the above-described Table 1 to “not supported” or “0”, and transmit it to the communication network, thereby disabling VoNR. As the VoNR is disabled during a call connection for the electronic device  101 , the communication network may connect to VoLTE through EPS fallback, not through VoNR. 
       FIG.  24    is a flowchart illustrating operations of an example electronic device according to various embodiments. Referring to  FIG.  24   , according to various embodiments, the electronic device  101  (e.g., at least one of the processor  120 , the first communication processor  212 , the second communication processor  214 , or the integrated communication processor  260 ) may connect with the 5G network via SA in operation  2401 . 
     According to various embodiments, the electronic device  101  may determine whether a low power mode (LPM) is met (identified) in operation  2402 . For example, the low power mode refers, for example, to a context in which power consumption of the electronic device  101  is to be reduced and may include, but is not limited to, is at least one of a heat generation context (e.g., over-temperature state), a context in which the display is turned off, or a context in which the battery level is a set value or less. For example, the over-temperature state may be identified based on receiving an indication indicating over-temperature by the communication processor when the temperature information obtained by the processor  120  is the designated threshold temperature (e.g., 43° C.) or more. 
     According to various embodiments, the electronic device  101  may identify whether it is making a VoNR call in operation  2404 . If it is identified that it is making a VoNR call (operation  2404 —YES), the electronic device  101  may perform handover to the LTE network in operation  2414 . For example, the handover to the LTE network may be performed as the electronic device  101  transmits a fake measurement report (MR) to the communication network. For example, inter-RAT handover requires that the signal strength of the serving RAT be less than or equal to a first threshold (threshold 1 ) and the signal strength of the target RAT be larger than or equal to a second threshold (threshold 2 ). To induce handover to the LTE network (e.g., N2L handover), the electronic device  101  may transmit a fake MR indicating that the signal strength of the serving RAT is equal to or smaller than the first threshold, thus allowing the communication network to lead the electronic device  101  to hand over to the LTE network. 
     If it is identified that it is not making a VoNR call in operation  2404  (operation  2404 —NO), the electronic device  101  may identify whether the bandwidth of the serving cell exceeds the first threshold in operation  2406 . For example, the bandwidth-related information may be identified through the above-described Tables 7 and 8. As a result of the identification in operation  2406 , if the bandwidth of the serving cell does not exceed the first threshold (operation  2406 —NO), the VoNR enabled state may be maintained. 
     According to various embodiments, as a result of the identification in operation  2406 , if the bandwidth of the serving cell exceeds the first threshold (operation  2406 —YES), the electronic device  101  may identify whether the BWP is supported during a VoNR call in operation  2408 . Whether the electronic device  101  supports the BWP during a VoNR call may be identified through information about whether BWP is supported (e.g., downlinkBWP-ToAddModList) in the RRC reconfiguration message of Table 9 as described above. For example, as described above, when “downlinkBWP-ToAddModList” is not included in the RRC reconfiguration message of Table 9, the corresponding electronic device  101  may determine that the BWP is not supported during a VoNR call. 
     According to various embodiments, if it is identified that the electronic device  101  supports BWP during a VoNR call as a result of the identification in operation  2408  (operation  2408 —YES), the electronic device  101  may identify whether the BWP set in the electronic device  101  exceeds a second threshold in operation  2410 . As a result of the identification in operation  2410 , if it is identified that the BWP set in the electronic device  101  does not exceed the second threshold (operation  2410 —NO), the VoNR enabled state may be maintained. 
     According to various embodiments, as a result of the identification in operation  2410 , if it is identified that the BWP set in the electronic device  101  exceeds the second threshold (operation  2410 —YES), the electronic device  101  may perform at least one operation for disabling VoNR in operation  2412 . As a result of the identification in operation  2408 , if it is identified that the electronic device  101  does not support BWP during a VoNR call (operation  2408 —NO), the electronic device  101  may perform at least one operation for disabling VoNR in operation  2412 . 
     For example, as described above in connection with Table 2, the electronic device  101  may set the “NG-RAN Radio Capability Update” in the registration request message to 1 and transmit it to the communication network, thereby notifying the communication network that the UE capability information needs to be updated. The communication network may identify that the electronic device  101  needs to update the UE capability through the registration request message transmitted from the electronic device  101 . The communication network may transmit a UE capability enquiry message to the electronic device  101  to identify the UE capability update information. The electronic device  101  may receive the UE capability enquiry message from the communication network and transmit UE capability information including the updated information to the communication network. As described above, the UE capability information may include information regarding whether the electronic device  101  supports VoNR. According to various embodiments, the electronic device  101  may update “voiceOverNR” in the above-described Table 1 to “not supported” or “0”, and transmit it to the communication network, thereby disabling VoNR. As the VoNR is disabled during a call connection for the electronic device  101 , the communication network may connect to VoLTE through EPS fallback, not through VoNR. 
     Embodiments of a VoLTE setup process when the electronic device  101  does not support BWP are described below with reference to  FIGS.  25  and  26   . 
       FIG.  25    is a flowchart illustrating operations of an example electronic device according to various embodiments. Referring to  FIG.  25   , according to various embodiments, the electronic device  101  may register with the communication network  2500  (e.g., the 5G network  350 ) and register VoNR with the IMS server through the communication network  2500  in operation  2502 . The VoNR registration procedure may be performed as described above in connection with  1411  of  FIG.  14 B . 
     According to various embodiments, according to receiving a call origination request from the user, the electronic device  101  may transmit a SIP INVITE message to the counterpart electronic device  101  through the communication network  2500  in operation  2504 . According to various embodiments, the electronic device  101  may receive the SIP 200 OK message transmitted from the counterpart electronic device through the communication network  2500  in operation  2506 . 
     According to various embodiments, the electronic device  101  may transmit an RRC reconfiguration message to the communication network  2500  which lacks a BWP setting in operation  2508 . The communication network  2500  may transmit a PDU session update command (PDU session modification command) to the electronic device  101  in operation  2510 . In response to receiving the PDU session update command, the electronic device  101  may transmit a PDU session update complete (PDU session modification complete) in operation  2512 . According to the completion of the RRC reconfiguration, the electronic device  101  may transmit an RRC reconfiguration complete message to the communication network  1400  in operation  2514 . Through the above procedure, the electronic device  101  may connect a VoNR call with the receiving electronic device through the communication network  1400  in operation  2516 . According to various embodiments, the electronic device  101  may hand over to the LTE network and connect a VoLTE call as described above in operation  2518 . 
       FIG.  26    is a flowchart illustrating operations of an example electronic device according to various embodiments. Referring to  FIG.  26   , according to various embodiments, the electronic device  101  may register with the communication network  2500  (e.g., the 5G network  350 ) and register VoNR with the IMS server through the communication network  2500  in operation  2602 . The VoNR registration procedure may be performed as described above in connection with  1411  of  FIG.  14 B . 
     According to various embodiments, according to receiving a call origination request from the user, the electronic device  101  may transmit a SIP INVITE message to the counterpart electronic device  101  through the communication network  2500  in operation  2604 . According to various embodiments, the electronic device  101  may receive the SIP 200 OK message transmitted from the counterpart electronic device through the communication network  2500  in operation  2606 . 
     According to various embodiments, the electronic device  101  may transmit an RRC reconfiguration message to the communication network  2500  which lacks a BWP setting in operation  2608 . According to various embodiments, the electronic device  101  may hand over to the LTE network and disable VoNR in operation  2610 . 
     According to various embodiments, the communication network  2500  (e.g., the LTE network  340 ) may transmit an active EPS bearer context request message to the electronic device  101  in operation  2612 . In response to receiving the active EPS bearer context request message, the electronic device  101  may transmit an active EPS bearer context accept message to the communication network  2500  (e.g., the LTE network  340 ) in operation  2614 . According to the above procedure, in operation  2616 , the electronic device  101  may complete the VoLTE call connection through the communication network  2500  (e.g., the LTE network  340 ). 
     According to various embodiments, it may be assumed that the battery capacity of the electronic device  101  is 3000 mA, the current consumption is 240 mA in a state of operating at NR 100 MHz, 256 QAM, and 4×4, the current consumption is 180 mA in a state of operating at NR 20 MHz, 256QAM, and 4×4, and the consumption current is 110 mA in a state of operating at LTE 10 MHz, 256QAM, and 2×2. In this case, it may be assumed that the above-described first threshold is 20 MHz, and the bandwidth of the serving cell is NR 100 MHz. If the remaining battery level of the electronic device  101  is 5% (150 mA) or less, an event related to the low power mode may be transferred from the processor to the communication processor. 
     According to various embodiments, the electronic device  101  may receive the event related to the low power mode and may compare the bandwidth of the serving cell with the first threshold. For example, since the bandwidth of the serving cell is 100 MHz and the first threshold is 20 MHz or more, it is possible to identify whether BWP is supported. According to various embodiments, the communication network may connect a VoNR call to the electronic device  101  at least once to identify whether BWP is supported. As a result of the identification, if BWP is not supported or, although supported, a BWP not less than 20 MHz which is the first threshold is allocated, the electronic device  101  may perform at least one operation for disabling VoNR as described above. If it is assumed that the current consumption is 240 mA upon VoNR call connection and is 110 mA upon VoLTE call connection when the electronic device  101  is so operated, it is possible to reduce current consumption by 130 mA, thus securing one hour of call time even with a remaining battery level of 5%. 
     According to various embodiments, it may be assumed that the electronic device  101  is a wearable device, the battery capacity is 3000 mA, the current consumption is 180 mA in a state of operating at NR 20 MHz, 256QAM, and 4×4, and the consumption current is 110 mA in a state of operating at LTE 10 MHz, 256QAM, and 2×2. In this case, it may be assumed that the above-described first threshold is 20 MHz, and the bandwidth of the serving cell is NR 20 MHz. If the temperature measured for the electronic device  101  is 41 degrees or more and is thus identified as the over-temperature state, an indicator indicating the over-temperature state or a low power mode-related event may be transferred from the processor to the communication processor. 
     According to various embodiments, the electronic device  101  may receive the event related to the low power mode and may compare the bandwidth of the serving cell with the first threshold. For example, since the bandwidth of the serving cell is 20 MHz and the first threshold is 20 MHz or more, it is possible to identify whether BWP is supported. According to various embodiments, the communication network may connect a VoNR call to the electronic device  101  at least once to identify whether BWP is supported. As a result of the identification, if BWP is not supported or, although supported, a BWP not less than 20 MHz which is the first threshold is allocated, the electronic device  101  may perform at least one operation for disabling VoNR as described above. If it is assumed that the current consumption is 180 mA upon VoNR call connection and is 110 mA upon VoLTE call connection when the electronic device  101  is so operated, it is possible to reduce current consumption by 70 mA and, if the current consumption is reduced by 70 mA, the temperature may be dropped by 1.16 degrees, thereby relieving the over-temperature state. 
       FIG.  27    is a flowchart illustrating operations of an example electronic device according to various embodiments. Referring to  FIG.  27   , according to various embodiments, the electronic device  101  may make a call to or receive a call from an external electronic device. The electronic device  101  may perform a call setup procedure with the currently connected communication network in operation  2702 . For example, the electronic device  101  (e.g., at least one of the processor  120 , the first communication processor  212 , the second communication processor  214 , or the integrated communication processor  260 ) may set up a VoNR call with an external electronic device through the 5G network  350  in a state connected to the 5G network  350  and complete the call setup in operation  2704 . The VoNR call setup procedure may be performed as described above in connection with  FIGS.  14 A and  14 B . 
     According to various embodiments, the electronic device  101  may identify whether the call quality condition is met in a VoNR call connected state with the external electronic device in operation  2706 . For example, as described above in connection with  FIG.  7   , the electronic device  101  may identify whether the call quality condition is met by identifying information related to call quality. For example, the information related to the call quality may include at least one of signal to interference and noise ratio (SINR), reference signal received power (RSRP), block error rate (BLER), modulation and coding scheme (MCS), residual error, or real time protocol (RTP) packet non-received information. Embodiments of determining whether the call quality condition is met based on the information related to each call quality have been described in detail with reference to  FIG.  7   , and thus, a description thereof is not repeated here. 
     According to various embodiments, if it is determined that the call quality condition is not met based on the information related to the call quality (operation  2706 —NO), the electronic device  101  may maintain the existing setting and operate in operation  2716 . 
     According to various embodiments, if the electronic device  101  determines that the call quality condition is met based on the information related to the call quality (operation  2706 —YES) (e.g., if it is determined that the call quality is ensured), the electronic device  101  may determine whether a background download packet exists in operation  2708 . According to various embodiments, the existence of the background download packet may be determined based on a grant ratio as described above. 
     According to various embodiments, when the electronic device  101  is in the VoNR call connected state, downlink packets having a relatively small size are generated, but when data packets are downloaded in the background, the grant ratio may increase. For example, when the grant ratio is equal to or larger than a setting value (e.g., 20%), the electronic device  101  may determine that a background download packet exists. 
     According to various embodiments, when the electronic device  101  determines that the background download packet exists in operation  2708  (operation  2708 —YES), the electronic device  101  may maintain the existing setting and operate in operation  2716 . 
     According to various embodiments, when the electronic device  101  determines that the background download packet does not exist in operation  2708  (operation  2708 —NO), the electronic device  101  may identify whether it is possible to perform a low-power mode operation (e.g., the operation of reducing the number of reception antennas or the operation of reducing the overall bandwidth in the SA CA environment) in operation  2710 . For example, when the serving cell is an NR refarming band and has a bandwidth of 10 MHz, the low power mode cannot operate. As described above, in such an environment, since the current consumption on VoNR is higher than current consumption on VoLTE during a call connection, it may be advantageous in terms of current consumption and heat generation control to receive/send a call via EPS fallback after disabling VoNR. According to various embodiments, when it is identified that the low power mode operation (e.g., the operation of reducing the number of reception antennas or the operation of reducing the overall bandwidth in the SA CA environment) cannot be performed in operation  2710  (operation  2710 —NO), the electronic device  101  may disable VoNR in operation  2714 . 
     According to various embodiments, when it is identified that the low power mode operation (e.g., the operation of reducing the number of reception antennas or the operation of reducing the overall bandwidth in the SA CA environment) can be performed in operation  2710  (operation  2710 —YES), the electronic device  101  may perform at least one operation for reducing current consumption in operation  2712 . For example, the electronic device  101  may control to reduce the number of reception antennas or to reduce the overall bandwidth in the SA CA environment. For example, in an environment in which the electronic device  101  cannot perform the operation set in response to the low power mode, current consumption may be reduced by disabling VoNR. According to various embodiments, since the electronic device  101  may have a current consumption effect by disabling VoNR even in an environment in which the operation set in response to the low power mode may be performed, the electronic device  101  may control to simultaneously perform the low power mode and VoNR disabling. 
       FIG.  28    is a flowchart illustrating operations of an example electronic device according to various embodiments. Referring to  FIG.  28   , according to various embodiments, the electronic device  101  (e.g., at least one of the processor  120 , the first communication processor  212 , the second communication processor  214 , or the integrated communication processor  260 ) may send or receive a call to/from an external electronic device. The electronic device  101  may perform a call setup procedure with the currently connected communication network. For example, in operation  2802 , the electronic device  101  may set up a VoNR call and complete the call setup with an external electronic device through the 5G network  350  while connected to the 5G network  350 . The VoNR call setup procedure may be performed as described above in connection with  FIGS.  14 A and  14 B . 
     According to various embodiments, the electronic device  101  may identify whether the measured temperature exceeds the first threshold (e.g., 43° C.) in operation  2804 . As a result of the identification, if the measured temperature does not exceed the first threshold (operation  2804 —NO), the existing operation may be performed. As a result of the identification, when the measured temperature exceeds the first threshold (operation  2804 —YES), the electronic device  101  may perform at least one operation for reducing current consumption in operation  2806 . For example, the electronic device  101  may reduce current consumption by performing the operation of reducing the number of antennas for reception among the plurality of antennas (e.g., from 4Rx to 2Rx) in operation  2806 . According to various embodiments, the operation of reducing current consumption may be implemented in other various manners than reducing the number of antennas. For example, the electronic device  101  may reduce current consumption by limiting the overall bandwidth of the serving cell and reduce current consumption by reducing the number of CAs. 
     According to various embodiments, after performing at least one operation for reducing current consumption, the electronic device  101  may identify whether the measured temperature exceeds the second threshold (e.g., 45° C.) in operation  2808 . As a result of the identification, when the measured temperature does not exceed the second threshold (operation  2808 —NO), the existing operation may be performed. As a result of the identification, when the measured temperature exceeds the second threshold (operation  2808 —YES), the electronic device  101  is in a state in which the over-temperature state is not addressed despite performing the operation for reducing current consumption and may thus perform handover to the LTE network in operation  2810 . For example, the handover to the LTE network may be performed as the electronic device  101  transmits a fake measurement report (MR) to the communication network. For example, inter-RAT handover requires that the signal strength of the serving RAT be less than or equal to a first threshold (threshold 1 ) and the signal strength of the target RAT be larger than or equal to a second threshold (threshold 2 ). To induce handover to the LTE network (e.g., N2L handover), the electronic device  101  may transmit a fake MR indicating that the signal strength of the serving RAT is equal to or smaller than the first threshold, thus allowing the communication network to lead the electronic device  101  to hand over to the LTE network. 
     According to any one of various embodiments, an electronic device may comprise a plurality of antennas; and at least one communication processor may be configured to communicate with a first communication network or a second communication network through the plurality of antennas. The at least one communication processor may be configured to set up a call with an external electronic device through the first communication network, identify information related to call quality in a call connected state with the external electronic device, and perform an operation for reducing a number of antennas for reception among the plurality of antennas based on identifying that the information related to the call quality meets a designated condition. 
     According to various embodiments, the first communication network may include a 5G network, and the second communication network may include an LTE network. 
     According to various embodiments, the call set up through the first communication network may include a voice over new radio (VoNR) call. 
     According to various embodiments, the information related to the call quality may include at least one of signal to interference and noise ratio (SINR), reference signal received power (RSRP), block error rate (BLER), modulation and coding scheme (MCS), residual error, or real time protocol (RTP) packet non-received information. 
     According to various embodiments, the at least one communication processor may control to refrain from reducing the number of antennas for reception, based on identifying that a grant ratio (GR) is a set value or more. 
     According to various embodiments, the at least one communication processor may be configured to reduce the number of antennas for reception even when the GR is the set value or more, based on identifying an over-temperature state. 
     According to various embodiments, the at least one communication processor may be configured to transmit a fake rank indicator (RI) to the first communication network to reduce the number of antennas for reception among the plurality of antennas. 
     According to various embodiments, the at least one communication processor may receive information in which layers corresponding to multiple-input and multiple-output for the electronic device are configured to be reduced, from the first communication network, in response to transmission of the fake RI. 
     According to various embodiments, the at least one communication processor may be configured to transmit a fake sounding reference signal (SRS) to the first communication network to reduce the number of antennas for reception among the plurality of antennas. 
     According to various embodiments, the at least one communication processor may identify an over-temperature state, and control to refrain from performing at least one operation configured in response to the identified over-temperature state, based on the electronic device being in the call connected state with the external electronic device. 
     According to any one of various embodiments, a method for reducing current consumption in an electronic device communicating with a first communication network or a second communication network through a plurality of antennas may comprise allowing the electronic device to set up a call with an external electronic device through the first communication network, allowing the electronic device to identify information related to call quality in a call connected state with the external electronic device, and reducing a number of antennas for reception among the plurality of antennas based on identifying that the information related to the call quality meets a designated condition. 
     According to various embodiments, the first communication network may include a 5G network, and the second communication network may include an LTE network. 
     According to various embodiments, the call set up through the first communication network may include a voice over new radio (VoNR) call. 
     According to various embodiments, the information related to the call quality may include at least one of signal to interference and noise ratio (SINR), reference signal received power (RSRP), block error rate (BLER), modulation and coding scheme (MCS), residual error, or real time protocol (RTP) packet non-received information. 
     According to various embodiments, the method may further comprise controlling to refrain from reducing the number of antennas for reception, based on identifying that a grant ratio (GR) is a set value or more. 
     According to any one of various embodiments, an electronic device may comprise a plurality of antennas and at least one communication processor may be configured to communicate with a first communication network or a second communication network through the plurality of antennas. The at least one communication processor may be configured to register voice over new radio (VoNR) through the first communication network, identify information related to a set bandwidth or bandwidth part (BWP) from the first communication network, and perform at least one operation for disabling the VoNR based on identifying that the information related to the bandwidth or the bandwidth part meets a designated condition. 
     According to various embodiments, the first communication network may include a 5G network, and the second communication network may include an LTE network. 
     According to various embodiments, the at least one communication processor may be configured to identify a bandwidth of a serving cell and perform at least one operation for disabling the VoNR based on identifying that the bandwidth of the serving cell exceeds a first threshold. 
     According to various embodiments, the at least one communication processor may be configured to identify whether the BWP is supported when the VoNR call is connected, and perform at least one operation for disabling the VoNR based on identifying that the BWP is not supported when the VoNR call is connected. 
     According to various embodiments, the at least one communication processor may be configured to identify whether the BWP is supported when the VoNR call is connected, identify whether the BWP exceeds a second threshold based on identifying that the BWP is supported when the VoNR call is connected, and perform at least one operation for disabling the VoNR based on identifying that the BWP exceeds the second threshold. 
     The electronic device according to various embodiments of the disclosure may be one of various types of electronic devices. The electronic devices may include, for example, a portable communication device (e.g., a smart phone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, a home appliance, or the like. According to an embodiment of the disclosure, the electronic devices are not limited to those described above. 
     It should be appreciated that various embodiments of the present disclosure and the terms used therein are not intended to limit the technological features set forth herein to particular embodiments and include various changes, equivalents, or replacements for a corresponding embodiment. With regard to the description of the drawings, similar reference numerals may be used to refer to similar or related elements. It is to be understood that a singular form of a noun corresponding to an item may include one or more of the things, unless the relevant context clearly indicates otherwise. As used herein, each of such phrases as “A or B,” “at least one of A and B,” “at least one of A or B,” “A, B, or C,” “at least one of A, B, and C,” and “at least one of A, B, or C,” may include all possible combinations of the items enumerated together in a corresponding one of the phrases. As used herein, such terms as “1st” and “2nd,” or “first” and “second” may be used to simply distinguish a corresponding component from another, and does not limit the components in other aspect (e.g., importance or order). If an element (e.g., a first element) is referred to, with or without the term “operatively” or “communicatively”, as “coupled with,” “coupled to,” “connected with,” or “connected to” another element (e.g., a second element), the element may be coupled with the other element directly (e.g., wiredly), wirelessly, or via a third element. 
     As used herein, the term “module” may include a unit implemented in hardware, software, or firmware, or any combination thereof, and may interchangeably be used with other terms, for example, “logic,” “logic block,” “part,” or “circuitry”. A module may be a single integral component, or a minimum unit or part thereof, adapted to perform one or more functions. For example, according to an embodiment, the module may be implemented in a form of an application-specific integrated circuit (ASIC). 
     Various embodiments as set forth herein may be implemented as software (e.g., the program) including one or more instructions that are stored in a storage medium (e.g., internal memory or external memory) that is readable by a machine (e.g., a master device or a device performing tasks). For example, a processor of the machine (e.g., a master device or a device performing tasks) may invoke at least one of the one or more instructions stored in the storage medium, and execute it, with or without using one or more other components under the control of the processor. This allows the machine to be operated to perform at least one function according to the at least one instruction invoked. The one or more instructions may include a code generated by a compiler or a code executable by an interpreter. The machine-readable storage medium may be provided in the form of a non-transitory storage medium. The term “non-transitory” storage medium refer, for example, to a tangible device, and may not include a signal (e.g., an electromagnetic wave), but this term does not differentiate between where data is semi-permanently stored in the storage medium and where the data is temporarily stored in the storage medium. 
     According to an embodiment, a method according to various embodiments of the disclosure may be included and provided in a computer program product. The computer program products may be traded as commodities between sellers and buyers. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., compact disc read only memory (CD-ROM)), or be distributed (e.g., downloaded or uploaded) online via an application store (e.g., Play Store™), or between two user devices (e.g., smart phones) directly. If distributed online, at least part of the computer program product may be temporarily generated or at least temporarily stored in the machine-readable storage medium, such as memory of the manufacturer&#39;s server, a server of the application store, or a relay server. 
     According to various embodiments, each component (e.g., a module or a program) of the above-described components may include a single entity or multiple entities. According to various embodiments, one or more of the above-described components may be omitted, or one or more other components may be added. Alternatively or additionally, a plurality of components (e.g., modules or programs) may be integrated into a single component. In such a case, according to various embodiments, the integrated component may still perform one or more functions of each of the plurality of components in the same or similar manner as they are performed by a corresponding one of the plurality of components before the integration. According to various embodiments, operations performed by the module, the program, or another component may be carried out sequentially, in parallel, repeatedly, or heuristically, or one or more of the operations may be executed in a different order or omitted, or one or more other operations may be added. 
     While the disclosure has been illustrated and described with reference to various example embodiments, it will be understood that the various example embodiments are intended to be illustrative, not limiting. It will be further understood by those skilled in the art that various changes in form and detail may be made without departing from the true spirit and full scope of the disclosure, including the appended claims and their equivalents. It will also be understood that any of the embodiment(s) described herein may be used in conjunction with any other embodiment(s) described herein.