PATENT DOCUMENT

Publication Number: US-10893564-B2
Application Number: US-201515325398-A
Country: US
Kind Code: B2

Title: Aborting an extended service request procedure

Abstract:
Briefly, in accordance with one or more embodiments, a method to implement an extended service request procedure for a circuit-switched fallback, comprises communicating with a packet-switched network, and initiating an extended service request procedure for a circuit-switched fallback to handle a voice call. If the voice call is terminated prior to completion of the extended service request procedure, the extended service request procedure may be aborted, and the user may remain in communication with the packet-switched network. Otherwise, the user completes the connection to the circuit-switched network and communicates with a circuit-switched network to handle the voice call.

Claims:
What is claimed is: 
     
       1. A user equipment (UE), comprising:
 a radio; and 
 a processor coupled to the radio and a memory coupled to the processor, wherein instructions in the memory configure the processor to:
 communicate with a packet-switched network; 
 initiate an extended service request procedure for a circuit-switched fallback to handle a voice call; 
 receive an indication of a Radio Access Technology (RAT) change from the packet-switched network during the extended service request procedure; 
 determine whether the voice call has been terminated prior to completion of the extended service request procedure; and 
 when the voice call has been terminated prior to completion of the extended service request procedure, abort the extended service request procedure, wherein aborting the extended service procedure includes ignoring the indication of the RAT change from the packet-switched network. 
 
 
     
     
       2. A user equipment as claimed in  claim 1 , wherein the processor is further configured to remain in communication with the packet-switched network without completing fall back to the circuit-switched network when the voice call is terminated prior to completion of the extended service request procedure. 
     
     
       3. A user equipment as claimed in  claim 1 , wherein the processor is further configured to reselect the packet-switched network when the voice call has not been terminated prior to the completion of extended service request procedure and after the voice call is completed. 
     
     
       4. A user equipment as claimed in  claim 1 , wherein the packet-switched network comprises a Long Term Evolution (LTE) network, and the circuit-switched network comprises a Second Generation (2G) network or a Third Generation (3G) network. 
     
     
       5. A user equipment as claimed in  claim 1 , wherein the packet-switched network comprises an Evolved Universal Terrestrial Radio Access Network (EUTRAN) and a Mobility Management Entity (MME) to couple to Internet Protocol (IP) Services. 
     
     
       6. A user equipment as claimed in  claim 1 , wherein the circuit-switched network comprises a Universal Terrestrial Radio Access Network (UTRAN) and/or Global System for Mobile Communications (GSM)/Enhanced Data Rates for GSM Evolution (EDGE) Radio Access Network (GERAN), a Serving GPRS Support Node (SGSN) and a Mobile Switching Center (MSC) Server to couple to a Public Switched Telephone Network (PSTN) to handle the voice call. 
     
     
       7. A user equipment as claimed in  claim 1 , wherein the processor is configured to handle the voice call via the packet-switched network as a Voice over LTE (VoLTE) call, and initiate the extended service request procedure if the packet-switched network no longer supports the VoLTE call. 
     
     
       8. A method to implement an extended service request procedure for a circuit-switched fallback, comprising:
 communicating with a packet-switched network; 
 initiating an extended service request procedure for a circuit-switched fallback to handle a voice call; 
 receiving an indication of a Radio Access Technology (RAT) change from the packet-switched network during the extended service request procedure; 
 determining whether the voice call has been terminated prior to completion of the extended service request procedure; 
 when the voice call has been terminated prior to completion of the extended service request procedure, aborting the extended service request procedure and remaining in communication with the packet-switched network, wherein aborting the extended service request procedure includes ignoring the indication of Radio Access Technology (RAT) change from the packet-switched network; and 
 when the voice call has not been terminated prior to the completion of the extended service request procedure, communicating with a circuit-switched network to handle the voice call. 
 
     
     
       9. A method as claimed in  claim 8 , further comprising reselecting the packet-switched network after the voice call is completed. 
     
     
       10. A method as claimed in  claim 8 , wherein the packet-switched network comprises a Long Term Evolution (LTE) network, and the circuit-switched network comprises a Second Generation (2G) network or a Third Generation (3G) network. 
     
     
       11. A method as claimed in  claim 8 , wherein the packet-switched network comprises an Evolved Universal Terrestrial Radio Access Network (EUTRAN) and a Mobility Management Entity (MME) to couple to Internet Protocol (IP) Services. 
     
     
       12. A method as claimed in  claim 8 , wherein the circuit-switched network comprises a Universal Terrestrial Radio Access Network (UTRAN) and/or Global System for Mobile Communications (GSM)/Enhanced Data Rates for GSM Evolution (EDGE) Radio Access Network (GERAN), a Serving GPRS Support Node (SGSN) and a Mobile Switching Center (MSC) Server to couple to a Public Switched Telephone Network (PSTN) to handle the voice call. 
     
     
       13. A method as claimed in  claim 8 , wherein the voice call is handled via the packet-switched network as a Voice over LIE (VoLTE) call, and the extended service request procedure is initiated if the packet-switched network is no longer able to support the VoLTE call. 
     
     
       14. An article of manufacture comprising a non-transitory storage medium having instructions stored thereon that, if executed, result in:
 communicating with a Long Term Evolution (LTE) network; 
 initiating a circuit-switched fallback procedure to handle a voice call; 
 receiving an indication of a Radio Access Technology (RAT) change from the LTE network during the circuit-switched fallback procedure; 
 determining whether the voice call is terminated prior to completion of the circuit-switched fallback procedure; 
 when the voice call is terminated prior to completion of the circuit-switched fallback procedure, aborting the circuit-switched fallback procedure and remaining in communication with the LTE network, wherein aborting the circuit-switched fallback procedure includes ignoring the indication of Radio Access Technology (RAT) change from the LTE network; and 
 when the voice call is not terminated prior to completion of the circuit-switched fallback procedure, communicating with a circuit-switched network to handle the voice call. 
 
     
     
       15. An article of manufacture as claimed in  claim 14 , wherein the instructions, if executed, further result in reselecting the LTE network after the voice call is completed. 
     
     
       16. An article of manufacture as claimed in  claim 14 , wherein the circuit-switched network comprises a Second Generation (2G) network or a Third Generation (3G) network. 
     
     
       17. An article of manufacture as claimed in  claim 14 , wherein the LTE network comprises an Evolved Universal Terrestrial Radio Access Network (EUTRAN) and a Mobility Management Entity (MME) to couple to Internet Protocol (IP) Services. 
     
     
       18. An article of manufacture as claimed in  claim 14 , wherein the circuit-switched network comprises a Universal Terrestrial Radio Access Network (UTRAN) and/or Global System for Mobile Communications (GSM)/Enhanced Data Rates for GSM Evolution (EDGE) Radio Access Network (GERAN), a Serving GPRS Support Node (SGSN) and a Mobile Switching Center (MSC) Server to couple to a Public Switched Telephone Network (PSTN) to handle the voice call.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application is the National Stage Application of International Application No. PCT/US2015/041179 filed Jul. 20, 2015, entitled ABORTING AN EXTENDED SERVICE REQUEST PROCEDURE. Said International Application No. PCT/US2015/041179 in turn claims the benefit of Indian Patent Application No. 4554/CHE/2014 filed Sep. 18, 2014. Said International Application No. PCT/US2015/041179 and said Indian Patent Application No. 4554/CHE/2014 are hereby incorporated herein by reference in their entireties for all purposes. 
     BACKGROUND 
     Long Term Evolution (LTE) networks are capable of providing higher data speeds to mobile users throughout the globe. In addition, Voice over LTE (VoLTE) allows voice calls to be handled as data via an LTE network. However, deployment of VoLTE features in networks may not be complete such that LTE networks may be available for a user to receive data services, but the operator may still need to provide voice calls/services over legacy networks. In such a situation, a user connected to an LTE network may need to fall back to a legacy second generation (2G) or third generation (3G) network using Global System for Mobile Communications (GSM) or Universal Mobile Telecommunications System (UMTS) Radio Access Technology (RAT) to handle a voice call via a circuit-switched fallback (CSFB) procedure. During a CSFB procedure, the user starts an Extended Service Request with the network to switch from the LTE network to the legacy 2G/3G network. If the user aborts the call during the time during which the Extended Service Request is ongoing, the network will still complete the fallback to the legacy 2G/3G network unnecessarily, and then reselect back to the LTE network. As a result, the user may spend a large of amount of unnecessary time to complete the CSFB procedure even though the voice call may have been already terminated and thereafter suffer from lower data transmission speeds in third and second generation networks functioning in UTMS or GSM, General Packet Radio Service (GPRS) or Enhanced GPRS (EGPRS) RAT technology leading to very bad user experience as the user is paying for LTE high speed data rates. 
    
    
     
       DESCRIPTION OF THE DRAWING FIGURES 
       Claimed subject matter is particularly pointed out and distinctly claimed in the concluding portion of the specification. However, such subject matter may be understood by reference to the following detailed description when read with the accompanying drawings in which: 
         FIG. 1  is a block diagram of a network capable of implementing an extended service request feature in accordance with one or more embodiments; 
         FIG. 2  is a flow diagram of a method implemented by a user equipment to implement an extended service request feature in accordance with one or more embodiments; 
         FIG. 3  is a flow diagram of interaction between a user equipment and a network to implement an extended service request in accordance with one or more embodiments; 
         FIG. 4  is a block diagram of an information handling system capable of implementing an extended service request in accordance with one or more embodiments; and 
         FIG. 5  is an isometric diagram of an information handling system as illustrated in  FIG. 4  in accordance with one or more embodiments. 
     
    
    
     It will be appreciated that for simplicity and/or clarity of illustration, elements illustrated in the figures have not necessarily been drawn to scale. For example, the dimensions of some of the elements may be exaggerated relative to other elements for clarity. Further, if considered appropriate, reference numerals have been repeated among the figures to indicate corresponding and/or analogous elements. 
     DETAILED DESCRIPTION 
     In the following detailed description, numerous specific details are set forth to provide a thorough understanding of claimed subject matter. However, it will be understood by those skilled in the art that claimed subject matter may be practiced without these specific details. In other instances, well-known methods, procedures, components and/or circuits have not been described in detail. 
     In the following description and/or claims, the terms coupled and/or connected, along with their derivatives, may be used. In particular embodiments, connected may be used to indicate that two or more elements are in direct physical and/or electrical contact with each other. Coupled may mean that two or more elements are in direct physical and/or electrical contact. However, coupled may also mean that two or more elements may not be in direct contact with each other, but yet may still cooperate and/or interact with each other. For example, “coupled” may mean that two or more elements do not contact each other but are indirectly joined together via another element or intermediate elements. Finally, the terms “on,” “overlying,” and “over” may be used in the following description and claims. “On,” “overlying,” and “over” may be used to indicate that two or more elements are in direct physical contact with each other. However, “over” may also mean that two or more elements are not in direct contact with each other. For example, “over” may mean that one element is above another element but not contact each other and may have another element or elements in between the two elements. Furthermore, the term “and/or” may mean “and”, it may mean “or”, it may mean “exclusive-or”, it may mean “one”, it may mean “some, but not all”, it may mean “neither”, and/or it may mean “both”, although the scope of claimed subject matter is not limited in this respect. In the following description and/or claims, the terms “comprise” and “include,” along with their derivatives, may be used and are intended as synonyms for each other. 
     Referring now to  FIG. 1 , a block diagram of a network capable of implementing an extended service request feature in accordance with one or more embodiments will be discussed. As shown in  FIG. 1 , network  100  may comprise a Long Term Evolution (LTE) network  110  and a legacy network  112  which may comprise a Third Generation (3G) network and/or a Second Generation (2G) network. In one or more embodiments, one or more of network  100  and network  112  may be in compliance with a Third Generation Partnership Project (3GPP) standard, and the scope of the claimed subject matter is not limited in this respect. In some embodiments, one or more of network  110  or network  112  may be in compliance with various other standards, for example an Institute of Electrical and Electronics Engineers (IEEE) standard, and/or other variations of a 3GPP standard such as an LTE Advanced (LTE-A) standard, and so on, and the scope of the claimed subject matter is not limited in this respect. 
     In one or more embodiments, LTE network  110  may comprise a packet-switched network and may include an Evolved Universal Terrestrial Radio Access Network (EUTRAN)  116  including one or more components of an LTE radio access network, and a Mobility Management Entity (MME)  118  coupled to EUTRAN  116 . EUTRAN  116  may include the various components of an LTE radio access network including but not limited to an enhanced Node B (eNB) to provide a wireless link between user equipment (UE)  114  and LTE network  110 . Mobility Management Entity (MME)  118  may function as a control node for LTE network  110  and to provide functions such as paging and bearer activation and deactivation for UE  114 , among other functions. MME  118  further may further provide control plane functions for mobility of UE  114  between LTE network  110  and legacy network  112 . LTE network  110  may include various other functions and/or nodes that are not shown, for example a Serving Gateway, a Packet Date Network (PDN) Gateway, among others, and the scope of the claimed subject matter is not limited in this respect. When connected to LTE network  110 , various Internet Protocol (IP) services  120  may be provided to UE  114  via LTE network  120 . 
     In one or more embodiments, legacy network  112  may comprise a circuit-switched network at least in part and may include a Universal Terrestrial Radio Access Network (UTRAN) and/or Global System for Mobile Communications (GSM)/Enhanced Data Rates for GSM Evolution (EDGE) Radio Access Network (GERAN)  122 . UTRAN or GERAN  122  comprises a UTRAN when legacy network  112  provides 3G services, and UTRAN or GERAN  122  comprises a GERAN when legacy network  122  provides 2G services. EUTRAN or GERAN  122  includes a radio network access network and respective components to provide a wireless link between UE  114  and legacy network  112  and may include various elements or nodes such as a Node B and a Radio Network Controller (RNC) among various other elements not shown. Legacy network  112  may include a Serving GPRS Support Node (SGSN)  124  to provide data services to UE  114 , and a Mobile Switching Center (MSC) Server  126  to provide voice services to UE  114 , for example to connect UE  114  to voice calls via Public Switched Telephone Network (PSTN)  128  as circuit-switched calls. 
     In one or more embodiments, as discussed in further detail below, UE  114  may be coupled with LTE network  110  and may initiate or receive a telephone call. In such a situation, LTE network  110  and/or UE  114  may not support Voice over LTE (VoLTE) services, in which case UE  114  should couple to PSTN  128  to make or receive the telephone call. A circuit-switched fallback (CSFB) procedure may be implemented/supported by network  100  so that the UE  114  may switch from using LTE network  110  to legacy network  112  in order to communicate via PSTN  128  for the duration of the telephone call using voice services. As part of the CSFB procedure, an Extended Service Request for CSFB may be requested by UE  114 . In accordance with one or more embodiments, if the call is terminated or otherwise ended before the Extended Service Request procedure is completed, the Extended Service Request procedure may be aborted by UE  114  so that the fallback to legacy network  112  is not completed, and UE  114  remains connected to LTE network  110 . An example method to complete or abort the fallback procedure is shown in and described with respect to  FIG. 2 , below. 
     Referring now to  FIG. 2 , a flow diagram of a method implemented by a user equipment to implement an extended service request feature in accordance with one or more embodiments will be discussed. It should be noted that although  FIG. 2  illustrates one example embodiments of method  200 , method  200  may include more or fewer blocks than shown, and may include various orders of the blocks, and the scope of the claimed subject matter is not limited in these respects. At bock  210 , UE  114  communicates via LTE network  110  using EUTRAN  116 . UE  114  may receive or place a voice call at block  212  which may be a circuit-switched call. If a circuit-switched fallback (CSFB) procedure is needed to service the voice call, UE  114  may initiate an Extended Service Request at block  214  for implementing the CSFB procedure, and start an Extended Service Request Timer T3417Ext at block  216 . A determination may be made at block  218  by UE  114  whether to abort the voice call. For example, the user of UE  114  may terminate the call before the Extended Service Request procedure is completed. In such a situation, UE  114  is aware that the voice call has been aborted or terminated, so that the CSFB procedure may be aborted before UE  114  completes fallback to legacy network  112 . UE  114  ignores the Indication of System (Radio Access Technology (RAT)) Change from the Network (NW) at block  220 , and UE  114  may remain connected with EUTRAN  116  to continue to communicate via LTE network  110 . Thus, UE  114  locally aborts the Extended Service Request procedure and remains coupled with EUTRAN  116  of LTE network  110 , and stops the Extended Service Request Timer T3417Ext. Furthermore, UE  114  may not attempt a retry of the Extended Service Request. 
     In the event UE  114  does not abort the voice call, method  200  may continue to complete the RAT change in which case UE  114  keeps the Extended Service Request Timer T3417Ext running Once the System (Radio Access Technology (RAT)) Change from NW is successful the UE  114  then communicates at block  222  over PSTN  128  via UTRAN or GERAN  122  to handle the voice call as a circuit-switched call. At the end of the voice call, UE  114  may reselect LTE network  110  at block  224 . By aborting the Extended Service Request procedure in the event a call is terminated or ended before the procedure is completed, UE  114  may avoid the time involved with reselection to LTE network  110  from legacy network  112  and thereafter also not suffer from lower data transmission speeds in third and second generation networks functioning in UTMS or GSM/(E)GPRS RAT technology leading to very bad user experience as the user is paying for LTE high speed data rates as shown in and described with respect to  FIG. 3 , below. 
     Referring now to  FIG. 3 , a flow diagram of interaction between a user equipment and a network to implement an extended service request in accordance with one or more embodiments will be discussed. As shown in  FIG. 3 , UE  114  communicates with network  100  to implement an extended service request method  300 , for example as discussed with respect to  FIG. 2  and  FIG. 3 , above. At step  312 , UE  114  is registered with EUTRAN  116 , and UE  114  and network  100  are circuit-switched fallback (CSFB) capable, and the user may trigger a mobile originated (MO) call. At step  314 , an Extended Service Request Procedure may be communicated from UE  114  to network  110 . UE  114  then starts an Extended Service Request Timer T3417Ext running at  316 . Network  100  sends a Radio Resource Controller (RCC) connection release with redirection information Cell Change Order (CCO) or a packet-switched (PS) handover (HO) or redirection at step  318 . At step  320 , UE  114  falls back to the UTRAN or GERAN  122 . After the call is complete, UE  114  reselects to EUTRAN  116  at step  322 . It should be noted that by implementing method  200  of  FIG. 2 , UE  114  is capable of aborting method  300  of  FIG. 3  at any point during time frame  324 . In the event that UE  114  is able to abort method  300  during time frame  324 , UE  114  does not need to spend the time involved to fall back to UTRAN or GERAN  122  at step  320  and the time involved to reselect to ETUTRAN  116  at step  322 . Thus, UE  114  can avoid time frame  326  during which UE  114  is devoid of LTE services unnecessarily and also not suffer from lower data transmission speeds in third and second generation networks functioning in UTMS or GSM/(E)GPRS RAT technology leading to very bad user experience as the user is paying for LTE high speed data rates. 
     Referring now to  FIG. 4 , a block diagram of an information handling system capable of implementing an extended service request in accordance with one or more embodiments will be discussed. Information handling system  400  of  FIG. 4  may tangibly embody any one or more of the elements described herein, above, including for example UE  114 , EUTRAN  116 , MME  118 , UTRAN or GERAN  122 , SGSN  124 , or MSC Server  126 , with greater or fewer components depending on the hardware specifications of the particular device. Although information handling system  400  represents one example of several types of computing platforms, information handling system  400  may include more or fewer elements and/or different arrangements of elements than shown in  FIG. 4 , and the scope of the claimed subject matter is not limited in these respects. 
     In one or more embodiments, information handling system  400  may include an application processor  410  and a baseband processor  412 . Application processor  410  may be utilized as a general-purpose processor to run applications and the various subsystems for information handling system  400 . Application processor  410  may include a single core or alternatively may include multiple processing cores wherein one or more of the cores may comprise a digital signal processor or digital signal processing (DSP) core. Furthermore, application processor  410  may include a graphics processor or coprocessor disposed on the same chip, or alternatively a graphics processor coupled to application processor  410  may comprise a separate, discrete graphics chip. Application processor  410  may include on board memory such as cache memory, and further may be coupled to external memory devices such as synchronous dynamic random access memory (SDRAM)  414  for storing and/or executing applications during operation, and NAND flash  416  for storing applications and/or data even when information handling system  400  is powered off. In one or more embodiments, instructions to operate or configure the information handling system  400  and/or any of its components or subsystems to operate in a manner as described herein may be stored on a article of manufacture comprising a non-transitory storage medium. In one or more embodiments, the storage medium may comprise any of the memory devices shown in and described herein, although the scope of the claimed subject matter is not limited in this respect. Baseband processor  412  may control the broadband radio functions for information handling system  400 . Baseband processor  412  may store code for controlling such broadband radio functions in a NOR flash  418 . Baseband processor  412  controls a wireless wide area network (WWAN) transceiver  420  which is used for modulating and/or demodulating broadband network signals, for example for communicating via a 3GPP LTE or LTE-Advanced network or the like. 
     In general, WWAN transceiver  420  may operate according to any one or more of the following radio communication technologies and/or standards including but not limited to: a Global System for Mobile Communications (GSM) radio communication technology, a General Packet Radio Service (GPRS) radio communication technology, an Enhanced Data Rates for GSM Evolution (EDGE) radio communication technology, and/or a Third Generation Partnership Project (3GPP) radio communication technology, for example Universal Mobile Telecommunications System (UMTS), Freedom of Multimedia Access (FOMA), 3GPP Long Term Evolution (LTE), 3GPP Long Term Evolution Advanced (LTE Advanced), Code division multiple access 2000 (CDMA2000), Cellular Digital Packet Data (CDPD), Mobitex, Third Generation (3G), Circuit Switched Data (CSD), High-Speed Circuit-Switched Data (HSCSD), Universal Mobile Telecommunications System (Third Generation) (UMTS (3G)), Wideband Code Division Multiple Access (Universal Mobile Telecommunications System) (W-CDMA (UMTS)), High Speed Packet Access (HSPA), High-Speed Downlink Packet Access (HSDPA), High-Speed Uplink Packet Access (HSUPA), High Speed Packet Access Plus (HSPA+), Universal Mobile Telecommunications System-Time-Division Duplex (UMTS-TDD), Time Division-Code Division Multiple Access (TD-CDMA), Time Division-Synchronous Code Division Multiple Access (TD-CDMA), 3rd Generation Partnership Project Release 8 (Pre-4th Generation) (3GPP Rel. 8 (Pre-4G)), UMTS Terrestrial Radio Access (UTRA), Evolved UMTS Terrestrial Radio Access (E-UTRA), Long Term Evolution Advanced (4th Generation) (LTE Advanced (4G)), cdmaOne (2G), Code division multiple access 2000 (Third generation) (CDMA2000 (3G)), Evolution-Data Optimized or Evolution-Data Only (EV-DO), Advanced Mobile Phone System (1st Generation) (AMPS (1G)), Total Access Communication System/Extended Total Access Communication System (TACS/ETACS), Digital AMPS (2nd Generation) (D-AMPS (2G)), Push-to-talk (PTT), Mobile Telephone System (MTS), Improved Mobile Telephone System (IMTS), Advanced Mobile Telephone System (AMTS), OLT (Norwegian for Offentlig Landmobil Telefoni, Public Land Mobile Telephony), MTD (Swedish abbreviation for Mobiltelefonisystem D, or Mobile telephony system D), Public Automated Land Mobile (Autotel/PALM), ARP (Finnish for Autoradiopuhelin, “car radio phone”), NMT (Nordic Mobile Telephony), High capacity version of NTT (Nippon Telegraph and Telephone) (Hicap), Cellular Digital Packet Data (CDPD), Mobitex, DataTAC, Integrated Digital Enhanced Network (iDEN), Personal Digital Cellular (PDC), Circuit Switched Data (CSD), Personal Handy-phone System (PHS), Wideband Integrated Digital Enhanced Network (WiDEN), iBurst, Unlicensed Mobile Access (UMA), also referred to as also referred to as 3GPP Generic Access Network, or GAN standard), Zigbee, Bluetooth®, and/or general telemetry transceivers, and in general any type of RF circuit or RFI sensitive circuit. It should be noted that such standards may evolve over time, and/or new standards may be promulgated, and the scope of the claimed subject matter is not limited in this respect. 
     The WWAN transceiver  420  couples to one or more power amps  742  respectively coupled to one or more antennas  424  for sending and receiving radio-frequency signals via the WWAN broadband network. The baseband processor  412  also may control a wireless local area network (WLAN) transceiver  426  coupled to one or more suitable antennas  428  and which may be capable of communicating via a Wi-Fi, Bluetooth®, and/or an amplitude modulation (AM) or frequency modulation (FM) radio standard including an IEEE 802.11 a/b/g/n standard or the like. It should be noted that these are merely example implementations for application processor  410  and baseband processor  412 , and the scope of the claimed subject matter is not limited in these respects. For example, any one or more of SDRAM  414 , NAND flash  416  and/or NOR flash  418  may comprise other types of memory technology such as magnetic memory, chalcogenide memory, phase change memory, or ovonic memory, and the scope of the claimed subject matter is not limited in this respect. 
     In one or more embodiments, application processor  410  may drive a display  430  for displaying various information or data, and may further receive touch input from a user via a touch screen  432  for example via a finger or a stylus. An ambient light sensor  434  may be utilized to detect an amount of ambient light in which information handling system  400  is operating, for example to control a brightness or contrast value for display  430  as a function of the intensity of ambient light detected by ambient light sensor  434 . One or more cameras  436  may be utilized to capture images that are processed by application processor  410  and/or at least temporarily stored in NAND flash  416 . Furthermore, application processor may couple to a gyroscope  438 , accelerometer  440 , magnetometer  442 , audio coder/decoder (CODEC)  444 , and/or global positioning system (GPS) controller  446  coupled to an appropriate GPS antenna  448 , for detection of various environmental properties including location, movement, and/or orientation of information handling system  400 . Alternatively, controller  446  may comprise a Global Navigation Satellite System (GNSS) controller. Audio CODEC  444  may be coupled to one or more audio ports  450  to provide microphone input and speaker outputs either via internal devices and/or via external devices coupled to information handling system via the audio ports  450 , for example via a headphone and microphone jack. In addition, application processor  410  may couple to one or more input/output (I/O) transceivers  452  to couple to one or more I/O ports  454  such as a universal serial bus (USB) port, a high-definition multimedia interface (HDMI) port, a serial port, and so on. Furthermore, one or more of the I/O transceivers  452  may couple to one or more memory slots  456  for optional removable memory such as secure digital (SD) card or a subscriber identity module (SIM) card, although the scope of the claimed subject matter is not limited in these respects. 
     Referring now to  FIG. 5 , an isometric view of an information handling system of  FIG. 4  that optionally may include a touch screen in accordance with one or more embodiments will be discussed.  FIG. 5  shows an example implementation of information handling system  400  of  FIG. 4  tangibly embodied as a cellular telephone, smartphone, or tablet type device or the like. The information handling system  400  may comprise a housing  510  having a display  430  which may include a touch screen  432  for receiving tactile input control and commands via a finger  516  of a user and/or a via stylus  518  to control one or more application processors  410 . The housing  510  may house one or more components of information handling system  400 , for example one or more application processors  410 , one or more of SDRAM  414 , NAND flash  416 , NOR flash  418 , baseband processor  412 , and/or WWAN transceiver  420 . The information handling system  400  further may optionally include a physical actuator area  520  which may comprise a keyboard or buttons for controlling information handling system via one or more buttons or switches. The information handling system  400  may also include a memory port or slot  456  for receiving non-volatile memory such as flash memory, for example in the form of a secure digital (SD) card or a subscriber identity module (SIM) card. Optionally, the information handling system  400  may further include one or more speakers and/or microphones  524  and a connection port  454  for connecting the information handling system  400  to another electronic device, dock, display, battery charger, and so on. In addition, information handling system  400  may include a headphone or speaker jack  528  and one or more cameras  436  on one or more sides of the housing  510 . It should be noted that the information handling system  400  of  FIG. 5  may include more or fewer elements than shown, in various arrangements, and the scope of the claimed subject matter is not limited in this respect. 
     In or more example embodiments, a user equipment (UE) comprises a radio, a processor coupled to the radio and a memory coupled to the processor, wherein instructions in the memory are capable of configuring the processor to communicate with a packet-switched network, initiate an extended service request procedure for a circuit-switched fallback to handle a voice call, and ignore an indication of Radio Access Technology (RAT) change from network if the voice call is terminated prior to completion of the extended service request procedure. The processor may be configured to remain in communication with the packet-switched network without completing fall back to the circuit-switched network if the voice call is terminated prior to completion of the extended service request procedure. The processor may be configured to reselect the packet-switched network after the voice call is completed. The packet-switched network may comprise a Long Term Evolution (LTE) network, and the packet-switched network may comprises a Second Generation (2G) network or a Third Generation (3G) network. The circuit-switched network may comprise an Evolved Universal Terrestrial Radio Access Network (EUTRAN) and a Mobility Management Entity (MME) to couple to Internet Protocol (IP) Services. The circuit-switched network may comprise a Universal Terrestrial Radio Access Network (UTRAN) and/or Global System for Mobile Communications (GSM)/Enhanced Data Rates for GSM Evolution (EDGE) Radio Access Network (GERAN), a Serving GPRS Support Node (SGSN) and a Mobile Switching Center (MSC) Server to couple to a Public Switched Telephone Network (PSTN) to handle the voice call. The processor may be configured to handle the voice call via the packet-switched network as a Voice over LTE (VoLTE) call, and initiate the extended service request procedure if the packet-switched network no longer supports the VoLTE call. 
     In one or more example embodiments, a method to implement an extended service request procedure for a circuit-switched fallback comprises communicating with a packet-switched network, and initiating an extended service request procedure for a circuit-switched fallback to handle a voice call. If the voice call is terminated prior to completion of the extended service request procedure, the method further comprises aborting the extended service request procedure and remaining in communication with the packet-switched network, or otherwise, communicating with a circuit-switched network to handle the voice call. The aborting of the extended service request procedure may comprise ignoring an indication of system (Radio Access Technology (RAT)) change from network by access stratum. The method further may comprise reselecting the packet-switched network after the voice call is completed. The packet-switched network may comprise a Long Term Evolution (LTE) network, and the circuit-switched network may comprise a Second Generation (2G) network or a Third Generation (3G) network. The packet-switched network may comprise an Evolved Universal Terrestrial Radio Access Network (EUTRAN) and a Mobility Management Entity (MME) to couple to Internet Protocol (IP) Services. The circuit-switched network may comprise s a Universal Terrestrial Radio Access Network (UTRAN) and/or Global System for Mobile Communications (GSM)/Enhanced Data Rates for GSM Evolution (EDGE) Radio Access Network (GERAN), a Serving GPRS Support Node (SGSN) and a Mobile Switching Center (MSC) Server to couple to a Public Switched Telephone Network (PSTN) to handle the voice call. The voice call may be handled via the packet-switched network as a Voice over LTE (VoLTE) call, and the extended service request procedure may be initiated if the packet-switched network is not able to support the VoLTE call. 
     In one or more example embodiments, an article of manufacture comprises a non-transitory storage medium having instructions stored thereon that, if executed, result in communicating with a Long Term Evolution (LTE) network, and initiating a circuit-switched fallback procedure to handle a voice call. If the voice call is terminated prior to completion of the circuit-switched fallback procedure, the instructions further result in aborting the circuit-switched fallback procedure and remaining in communication with the LTE network, or otherwise, communicating with a circuit-switched network to handle the voice call. Aborting the extended service request procedure may comprise ignoring an indication of Radio Access Technology (RAT) change from network. The instructions, if executed, further may result in reselecting the LTE network after the voice call is completed. The circuit-switched network may comprise a Second Generation (2G) network or a Third Generation (3G) network. The LTE network may comprise an Evolved Universal Terrestrial Radio Access Network (EUTRAN) and a Mobility Management Entity (MME) to couple to Internet Protocol (IP) Services The circuit-switched network may comprise a Universal Terrestrial Radio Access Network (UTRAN) and/or Global System for Mobile Communications (GSM)/Enhanced Data Rates for GSM Evolution (EDGE) Radio Access Network (GERAN), a Serving GPRS Support Node (SGSN) and a Mobile Switching Center (MSC) Server to couple to a Public Switched Telephone Network (PSTN) to handle the voice call. 
     Although the claimed subject matter has been described with a certain degree of particularity, it should be recognized that elements thereof may be altered by persons skilled in the art without departing from the spirit and/or scope of claimed subject matter. It is believed that the subject matter pertaining to aborting an extended service request procedure and many of its attendant utilities will be understood by the forgoing description, and it will be apparent that various changes may be made in the form, construction and/or arrangement of the components thereof without departing from the scope and/or spirit of the claimed subject matter or without sacrificing all of its material advantages, the form herein before described being merely an explanatory embodiment thereof, and/or further without providing substantial change thereto. It is the intention of the claims to encompass and/or include such changes.

Metadata:
Filing Date: 20150720
Publication Date: 20210112
Grant Date: 20210112
Priority Date: 20140918
Inventors: TOTADAMANE RAMAPPA, SHASHANKA
SHEIKH, Parvez
Assignee: APPLE INC
CPC Classifications: [{"code": "H04W36/00224", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04W88/06", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04W88/06", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04W76/19", "inventive": true, "first": true, "tree": "[]"}, {"code": "H04W76/10", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04W84/042", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04W88/06", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04W36/0022", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04W84/042", "inventive": false, "first": false, "tree": "[]"}, {"code": "H04W76/19", "inventive": true, "first": true, "tree": "[]"}, {"code": "H04W76/10", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04W76/10", "inventive": true, "first": true, "tree": "[]"}, {"code": "H04W76/19", "inventive": true, "first": false, "tree": "[]"}, {"code": "H04W36/00224", "inventive": true, "first": false, "tree": "[]"}]
Family ID: 55533670