Patent Publication Number: US-2022217555-A1

Title: Measuring device and measuring method

Description:
TECHNICAL FIELD 
     The present invention relates to a measuring device having a signal analysis function that receives and analyzes a signal to be measured transmitted from a mobile terminal when testing a mobile terminal by simulating a base station, and a measuring method. 
     BACKGROUND ART 
     For example, in a mobile phone system, with the multifunctionalization of the mobile terminals, the wireless communication speed with mobile terminals and a wireless base station (hereinafter referred to as a base station) has been increased. In recent years, for example, technological development for shifting from  4 th generation (4G) services that employ the LTE-Advanced method or the like to 5th generation (5G) services is progressing. 
     Against this background, new models of mobile communication terminals (hereinafter referred to as mobile terminals) such as mobile phones have been developed one after another, and it is necessary to test whether or not the newly developed mobile terminals operate normally. 
     As a device for testing a mobile terminal, a testing device has been known which communicates with a pseudo terminal that simulates the communication function of a new mobile terminal that transmits and receives a radio frequency signal corresponding to a predetermined communication standard and tests the operation of the communication function (see, for example, Patent Document 1). 
     In this testing device, it is possible to accurately evaluate a pseudo terminal that cannot perform real-time communication by performing an uplink data reception arithmetic process or a downlink data transmission in accordance with predetermined conditions, under the control of management means. 
     RELATED ART DOCUMENT 
     Patent Document 
     [Patent Document 1] JP-A-2015-192349 
     DISCLOSURE OF THE INVENTION 
     Problem that the Invention is to Solve 
     The testing device described in Patent Document 1 can analyze not only the main data in the signals (uplink data and downlink data) transmitted to and received from the pseudo terminal but also the signal of the physical layer. However, the testing device described in Patent Document 1 only controls the timing for matching the transmission/reception timings between the pseudo terminal to be tested and the testing device side, and does not have a function of performing control to analyze the transmitted/received signals under which communication state, for which signal or channel. 
     Therefore, although the testing device described in Patent Document 1 analyzes the signal data up to the physical layer in accordance with the reception or transmission of main data, but has a problem that it is difficult to set conditions including, for example, a signal type, a channel, or a reception status such as the normality or abnormality of the signal and analyze IQ data corresponding to the communication state satisfying the conditions. 
     The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a measuring device and a measuring method capable of setting conditions including a signal type, a channel, and a reception status, and performing detailed analysis of IQ data corresponding to a communication state satisfying the conditions. 
     MEANS FOR SOLVING THE PROBLEM 
     In order to solve the above problems, a measuring device according to claim  1  of the present invention has a configuration including a reception unit ( 11   a ) that receives a signal to be measured transmitted from a mobile terminal ( 70 ); a signal data calculation unit ( 12 ) that converts the signal to be measured into a digital signal and calculates signal data; a trigger signal output unit ( 13 ) that outputs a trigger signal at a predetermined timing when a predetermined trigger condition is satisfied; a signal extraction unit ( 14 ) that receives the trigger signal, and extracts IQ data in a predetermined section according to the predetermined timing from the signal data; and an IQ data analysis unit ( 52 ) that analyzes the extracted IQ data. 
     With this configuration, the measuring device according to claim  1  of the present invention can acquire IQ data in a predetermined section of the signal to be measured and analyze the IQ data only under a communication state satisfying the trigger condition, and can support a detailed analysis process of the IQ data at a desired signal type, a channel, or a reception status level, depending on the setting of the trigger condition. 
     The measuring device according to claim  2  of the present invention can be configured such that the predetermined section according to the predetermined timing has a starting point before the predetermined timing. 
     With this configuration, the measuring device according to claim  2  of the present invention can extract, as an analysis target, IQ data in a predetermined section starting from a time point before it is determined that the trigger condition is satisfied, and can reliably analyze the IQ data under the reception status satisfying the trigger condition. 
     The measuring device according to claim  3  of the present invention further includes a storage unit ( 15 ) that stores the signal data calculated by the signal data calculation unit in a ring buffer memory, in which the signal extraction unit may extract signal data in the predetermined section from the signal data stored in the ring buffer memory. 
     With this configuration, the measuring device according to claim  3  of the present invention can always secure the latest fixed amount of signal data among the signal data sequentially calculated by the signal data calculation unit in the ring buffer memory, and reliably extract IQ data in a predetermined section starting from a time point before it is determined that the trigger condition is satisfied. 
     In the measuring device according to claim  4  of the present invention, the signal data extracted by the signal extraction unit is signal data of a physical layer, and the trigger signal is output when the predetermined trigger condition is either ULSCH, UCI (SR), UCI (CSI), UCI (HARQ-ACK), PRACH or SRS, a total received power (total Power) is equal to or higher than a predetermined threshold, and the reception status is DTX, CRC NG, CRC OK, Decode NG, or Decode OK. 
     With this configuration, the measuring device according to claim  4  of the present invention can implement detailed analysis of IQ data at the reception status level such as DTX, CRC NG, CRC OK, or Decode NG, Decode OK for ULSCH, UCI (SR), UCI (CSI), UCI (HARQ-ACK), PRACH, SRS, or the like which are related to communication at the physical layer, depending on the setting of a predetermined trigger condition. 
     In the measuring device according to claim  5  of the present invention, the signal data extracted by the signal extraction unit is signal data of a physical layer, and the trigger condition is managed in accordance with a pseudo base station that simulates communication with the mobile terminal, and includes a period (act time) for activating a communication operation of the pseudo base station. 
     With this configuration, the measuring device according to claim  5  of the present invention operates to receive the signal to be measured at a timing managed by the pseudo base station by setting a predetermined act time as a predetermined trigger condition, and can reliably analyze the IQ data included in the signal to be measured at that time. 
     The measuring device according to claim  6  of the present invention may have a configuration in which the signal extraction unit and the IQ data analysis unit are connected by a wired cable. 
     With this configuration, the measuring device according to claim  6  of the present invention can connect the same type of measuring devices in parallel when the number of base stations further increases, and can cope with the case where the signals to be transmitted and received increase. 
     In order to solve the above problems, a measuring method according to claim  7  of the present invention is a measuring method for measuring a signal to be measured received from a mobile terminal ( 70 ) that transmits and receives radio frequency signals by using a measuring device ( 1 ) that tests the operation of the communication function of the mobile terminal by performing communication simulating a base station with the mobile terminal ( 70 ), and includes a trigger condition acquisition step (S 11 ) of acquiring an arbitrary channel of a physical layer used for receiving the signal to be measured, and a predetermined trigger condition in which the reception status of the signal to be measured in the channel is designated, a reception step (S 12 ) of receiving the signal to be measured from the mobile terminal ( 70 ), a signal data calculation step (S 13 ) of converting the signal to be measured into a digital signal and calculating signal data, a trigger signal output step (S 17 ) of outputting a trigger signal at a predetermined timing when a predetermined trigger condition is satisfied, a signal extraction step (S 18 ) of receiving the trigger signal and extracting IQ data in a predetermined section according to a predetermined timing from the signal data, and an IQ data analysis step (S 19 ) of analyzing the extracted IQ data. 
     With this configuration, the measuring method according to claim  7  of the present invention can acquire IQ data in a predetermined section of the signal to be measured and analyze the IQ data only under a communication state satisfying the trigger condition, and can support a detailed analysis process of the IQ data at a desired signal type, a channel, or a reception status level, depending on the setting of the trigger condition. 
     Advantage of the Invention 
     According to the present invention, it is possible to provide a measuring device and a measuring method capable of setting conditions including a signal type, a channel, and a reception status, and performing detailed analysis of IQ data corresponding to a communication state satisfying the conditions. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a block configuration diagram of a base station simulator according to a first embodiment of the present invention. 
         FIG. 2  is a diagram showing a configuration example of a trigger condition setting screen in the base station simulator according to the first embodiment of the present invention. 
         FIG. 3  is a flowchart showing a trigger condition setting processing operation in the base station simulator according to the first embodiment of the present invention. 
         FIG. 4  is a flowchart showing an IQ data analysis processing operation in the base station simulator according to the first embodiment of the present invention. 
         FIGS. 5A and 5B  are conceptual diagrams for explaining an acquisition image of IQ data using a ring buffer memory of the base station simulator according to the first embodiment of the present invention,  FIG. 5A  is a conceptual diagram showing a timing relationship between the start and end of storage of IQ data and a trigger signal in the ring buffer memory, and  FIG. 5B  shows the timing of the trigger signal in the storage range of the IQ data. 
         FIG. 6  is a diagram showing a display example of IQ data analysis results when the reception status of the trigger condition of the base station simulator according to the first embodiment of the present invention is set to CRC NG. 
         FIG. 7  is a diagram showing a display example of IQ data analysis results when the reception status of the trigger condition of the base station simulator according to the first embodiment of the present invention is set to CRC OK. 
         FIG. 8  is a block diagram showing a configuration of a measuring device according to a second embodiment of the present invention. 
     
    
    
     BEST MODE FOR CARRYING OUT THE INVENTION 
     Hereinafter, embodiments of a measuring device and a measuring method according to the present invention will be described with reference to the drawings. 
     (First Embodiment) 
     In the first embodiment, an example in which the measuring device of the present invention is applied to a base station simulator that tests a mobile terminal by simulating a base station will be described. First, the configuration of the base station simulator in the first embodiment will be described. 
     As shown in  FIG. 1 , a base station simulator  10  in the present embodiment tests the communication function of a mobile terminal (User Equipment (UE))  70  by transmitting and receiving radio frequency signals to and from the UE  70 . The UE  70  is a terminal such as a mobile phone or a mobile terminal that transmits and receives a radio frequency signal corresponding to a predetermined communication standard, for example, a communication standard called 5G NR. 
     The base station simulator  10  includes a control unit  20 , a transmission/reception unit  21 , an analog signal processing unit (signal data calculation unit)  22 , an uplink layer processing unit  23 , a log data generation unit  24 , a trigger detection unit  25 , an IQ data memory unit  26 , an IQ data analysis unit  27 , a display unit  28 , and an operation unit  29 . The base station simulator  10  includes a microcomputer (not shown) including a CPU, a ROM, a RAM, FPGA, an input/output circuit to which various interfaces are connected, and the like. That is, the base station simulator  10  causes the microcomputer to function as a base station simulator for testing the UE  70  by executing a control program stored in advance in the ROM. The base station simulator  10  constitutes a measuring device according to the present invention. 
     The control unit  20  is a function unit that controls the entire base station simulator  10 , and includes a pseudo base station control unit  20   a,  a trigger setting unit  20   b,  an analysis control unit  20   c,  and a display control unit  20   d.  The pseudo base station control unit  20   a  is a control means for managing a plurality of pseudo base stations, transmits a radio frequency signal simulating each pseudo base station to the UE  70  according to a preset test scenario, receiving a radio frequency signal (signal to be measured) transmitted from the UE  70  that has received the radio frequency signal, and analyzing signal data included in the signal to be measured to execute a test for evaluating the communication function of the UE  70 . 
     The trigger setting unit  20   b  performs control to set a condition for instructing the acquisition (storage) timing of the signal data to be analyzed among the signal data (IQ data) calculated from the received signal to be measured. When the communication state satisfying this condition is entered, the trigger signal is output from the trigger detection unit  25  described later. The above conditions set by the trigger setting unit  20   b  are hereinafter referred to as trigger conditions. 
     The analysis control unit  20   c  executes analysis control for analyzing the IQ data (calculated by the analog signal processing unit  22 ) stored in the IQ data memory unit  26  by receiving the trigger signal. The display control unit  20   d  performs display control for displaying various types of information such as IQ data analysis results on the display unit  28 . 
     The reception unit  21   a  is a function unit that is provided corresponding to the uplink path in which the UE  70  transmits a signal (signal to be measured) to the base station simulator  10 , and receives the radio frequency signal which is the signal (uplink data). 
     A transmission unit  21   b  is provided corresponding to a downlink path in which the UE  70  receives a signal from the base station simulator  10 . The transmission unit  21   b  transmits the baseband data (hereinafter, simply referred to as “IQ data”) of an I-phase component (in-phase component) and a Q-phase component (orthogonal component) which are downlink data generated by a base station simulation calculation unit (not shown) described later under the control of the pseudo base station control unit  20   a  of the control unit  20  to the UE  70 . When the UE  70  receives the baseband data transmitted from the transmission unit  21   b,  the UE  70  transmits the baseband data as a response signal to the reception to the base station simulator  10  as the above-described signal to be measured. 
     The transmission/reception unit  21  is composed of the transmission unit  21   b  and the reception unit  21   a.  The transmission/reception unit  21  communicates with the UE  70  via a Radio Frequency (RF) signal. 
     The analog signal processing unit  22  is an arithmetic processing function unit that receives an RF signal including uplink data from the UE  70 , received by the reception unit  21   a,  as a signal to be measured, converts the signal to be measured from an analog signal to a digital signal, and performs a decoding process to calculate IQ data. The analog signal processing unit  22  constitutes the signal data calculation unit of the present invention together with the uplink layer processing unit  23  to be described later. 
     The uplink layer processing unit  23  is a part that performs signal processing of each layer of signal data calculated by the analog signal processing unit  22 . The uplink layer processing unit  23  includes a PHY processing unit  23   a  that processes a Physical Layer (PHY layer), a MAC processing unit  23   b  that processes a Medium Access Control Layer (MAC layer) above the PHY layer, an RLC processing unit  23   c  that processes a Radio Link Control Layer (RLC layer) above the MAC layer, a PDCP processing unit  23   d  that processes a Packet Data Convergence Protocol Layer (PDCP layer) above the RLC layer, and an RRC processing unit  23   e  that processes a Radio Resource Control Layer (RRC layer) above the PDCP layer. 
     In the uplink layer processing unit  23 , the PHY processing unit  23   a  performs signal processing in the PHY layer on the signal data input from the analog signal processing unit  22 , and inputs the signal data to the MAC processing unit  23   b.  Examples of physical layer level channels, control information, and reception status information related to signal processing in the PHY layer are shown below. 
     First, channels include UpLink-Random Access CHannel (UL-RACH), UpLink Shared CHannel (uplink data channel (UL-SCH)), Physical Random Access CHannel (physical channel for random access (PRACH)), Physical Uplink Shared CHannel (PUSCH), Physical Uplink Control CHannel (PUCCH) and the like. 
     As the control information, Uplink Control Information (UCI), Scheduling Request (SR), Channel State Information (CSI), Hybrid Automatic Repeat reQuest ACKnowledgement (request response signal (HARQ-ACK)), Sounding Reference Signal (SRS) and the like are used. Further, UCI (SR), which is a UCI in which SR is inserted, UCI (CSI), which is a UCI in which CSI is inserted, and UCI (HARQ-ACK), which is a UCI in which HARQ-ACK is inserted, are also used. 
     In addition, reception status information includes Discontinuous Transmission (voice signal non-input state information (DTX)), Cyclic Redundancy Check (redundancy check code for error detection (CRC)) failure information (CRC NG), CRC success information (CRC OK), decoding failure information (Decode NG), decoding success information (Decode OK) and the like. 
     It is disclosed that the PHY processing unit  23   a  shown in  FIG. 1  has a configuration capable of processing the above-described channel, control information, and reception status information. Further, a configuration is also disclosed in which the PHY processing unit  23   a  has a demultiplexer (DEMUX) and the uplink data from the PUSCH is separated into two parts, UL-SCH and UCI, and transmitted. 
     Since the PHY processing unit  23   a  has a configuration capable of processing the above-described channel, control information, and reception status information, the base station simulator  10  can perform tests according to various test scenarios such as the following test scenarios 1 to 3. 
     Test scenario 1: The pseudo base station transmits a test signal as downlink data to the UE  70 , and the UE  70  responds, for example, with UCI (SR), UCI (CSI), and UCI (HARQ-ACK). 
     Test scenario 2: The pseudo base station transmits a test signal as downlink data to the UE  70 , and grasps the reception status from the response with, for example, either DTX, CRC NG, CRC OK, or Decode NG, and Decode OK from the UE  70 . 
     Test scenario 3: Perform tests based on test scenarios 1 and 2 at each channel level. 
     The MAC processing unit  23   b  processes each processing signal of the PHY layer input from the PHY processing unit  23   a  as a signal of the MAC layer, and passes the processed signal to the RLC processing unit  23   c.  The RLC processing unit  23   c  processes each processing signal of the MAC layer input from the MAC processing unit  23   b  as a signal of the RLC layer, and passes the processed signal to the PDCP processing unit  23   d.  The PDCP processing unit  23   d  processes each processing signal of the PLC layer input from the RLC processing unit  23   c  as a signal of the PDCP layer, and passes the processed signal to the RRC processing unit  23   e.  The RRC processing unit  23   e  processes each processing signal of the PDCP layer input from the PDCP processing unit  23   d  as a signal of the PRC layer. 
     In the uplink layer processing unit  23 , the signal of each layer processed by the PHY processing unit  23   a,  the MAC processing unit  23   b,  the RLC processing unit  23   c,  the PDCP processing unit  23   d,  and the RRC processing unit  23   e  is transmitted to the log data generation unit  24 . Of these, the signal of each layer processed by the PHY processing unit  23   a  and the MAC processing unit  23   b  is also is transmitted to the trigger detection unit  25 . 
     In this way, the uplink layer processing unit  23  is configured to perform a communication protocol process of each layer in accordance with a predetermined communication standard, processes the signal data from the analog signal processing unit  22  to output the signal data to the log data generation unit  24 , and outputs the signal data of the PHY layer and the MAC layer to the trigger detection unit  25 . 
     The log data generation unit  24  generates log data from the signal data output from the uplink layer processing unit  23 . The log data generated by the log data generation unit  24  includes time information and identifier information. The log data generated by the log data generation unit  24  is stored in a log data storage unit (not shown) composed of a large-capacity storage medium such as a hard disk drive (HDD) or a flash memory, for example. 
     The log data generation unit  24  has an IQ analysis parameter generation unit  24   a.  The IQ analysis parameter generation unit  24   a  generates IQ analysis parameters based on the signal data generated as described above, and transmits the generated IQ analysis parameters to a log data display unit  28   a  described later. 
     The trigger detection unit  25  has a function of monitoring the communication state involved in the above-described channels, control information and reception status information of the PHY layer and the MAC layer, based on the signal data of the PHY layer and the MAC layer input from the PHY processing unit  23   a  and the MAC processing unit  23   b  of the uplink layer processing unit  23 , and determining (detecting) whether or not a communication state satisfies a preset trigger condition. The trigger condition is composed of, for example, a channel, a signal (for example, limited to the PHY layer and the MAC layer) type, and a reception status to be analyzed. The trigger condition can be set for each cell of a plurality of pseudo base stations (cells) under the control of the pseudo base station control unit  20   a  provided in the control unit  20 , for example. The trigger condition is set, under the control of the trigger setting unit  20   b  constituting the control unit  20 , by using the setting screen displayed on a trigger setting display unit  28   b  of the display unit  28  described later. 
     Among the information constituting the trigger condition, the cell to be analyzed can be selectively designated from the plurality of pseudo base stations (cells) under the control of the pseudo base station control unit  20   a.  As the signal or channel to be analyzed, any one of ULSCH, UCI (SR), UCI (CSI), UCI (HARQ-ACK), PRACH or SRS can be selectively designated from the channels or control information described in the explanation of the configuration of the PHY processing unit  23   a. Further, the reception status can also be selectively designated from the above-described DTX, CRC NG, CRC OK, Decode NG, or Decode OK. The trigger condition may further include the total received power (total Power) of the signal to be analyzed. 
     The trigger detection unit  25  has a function of transmitting a trigger signal instructing to store the signal data under the communication state in the IQ data memory unit  26 , when detecting that a communication state satisfying the trigger condition has occurred. The trigger detection unit  25  constitutes the trigger signal output unit of the present invention. 
     The IQ data memory unit  26  stores signal data calculated by the analog signal processing unit  22 , and is composed of, for example, a ring buffer memory. When the trigger signal is input from the trigger detection unit  25 , the IQ data memory unit  26  stores the signal data (IQ data) calculated by the analog signal processing unit  22  in the ring buffer memory. 
     Since the IQ data memory unit  26  is composed of a ring buffer memory, when the trigger is set, for example, as shown in  FIG. 5A , writing of IQ data to the buffer memory is started before the trigger signal is generated (input), and when the trigger signal is generated (input), the writing of the IQ data is stopped within the range that does not overwrite the previous data in the designated range. With such a structure, the IQ data memory unit  26  can acquire IQ data before the trigger signal is generated. 
     Here, the range of IQ data acquired from the timing when the trigger signal is generated is determined based on, for example, the time before the trigger signal (Trigger Offset O) and the data acquisition time (Data length L), as shown in  FIG. 5B .  FIG. 5B  shows an example in which the ratio of Trigger Offset O to Data length L is 1:6, and IQ data corresponding to the data acquisition time (Data length L) and the addition time of 5 times the data acquisition time is acquired. As described above, the IQ data memory unit  26  has a function of receiving a trigger signal and extracting IQ data in a predetermined section according to a predetermined timing from the signal data, and constitutes the signal extraction unit of the present invention. Further, the IQ data memory unit  26  stores the signal data calculated by the analog signal processing unit  22  in the ring buffer memory, and constitutes the storage unit of the present invention. 
     The IQ data analysis unit  27  is a processing function unit that analyzes and processes IQ data stored in the IQ data memory unit  26  under the control of the analysis control unit  20   c,  and includes an IQ data reading unit  27   a,  a parameter reading unit  27   b,  and data analysis unit  27   c.  The IQ data reading unit  27   a  performs a process of reading IQ data stored in the IQ data memory unit  26 . The parameter reading unit  27   b  executes a process of reading the IQ analysis parameters generated by the IQ analysis parameter generation unit  24   a  of the log data generation unit  24  in accordance with the IQ data reading by the IQ data reading unit  27   a.  The data analysis unit  27   c  executes a process of analyzing the IQ data read from the IQ data memory unit  26  based on the IQ analysis parameters. The IQ data analysis unit  27  and the IQ data memory unit  26  are preferably connected by a wired cable. The IQ data analysis unit  27  constitutes the IQ data analysis unit of the present invention. 
     The display unit  28  includes a log data display unit  28   a,  a trigger setting display unit  28   b,  and an analysis result display unit  28   c.  The log data display unit  28   a  is a part that displays a display screen for displaying a log, and the trigger setting display unit  28   b  is a part that displays a setting screen  30  (see  FIG. 2 ) for setting a trigger condition, and the analysis result display unit  28   c  is a part that displays analysis result screens  40   a  (see  FIGS. 6 ) and  40   b  (see  FIG. 7 ). 
     In the control unit  20 , the display control unit  20   d  generates a display screen for displaying the log, reads the log data from the log data storage unit according to the operation content of the operation unit  29 , and displays the log based on the information included in the log data on the log data display unit  28   a.  The display control unit  20   d  also generates the setting screen  30  (see  FIG. 2 ) for setting the trigger condition, reads the setting screen  30  according to the operation content of the operation unit  29 , and displays the setting screen  30  on the trigger setting display unit  28   b.  Further, the display control unit  20   d  generates the analysis result screens  40   a  and  40   b  (see  FIGS. 6 and 7 ) for displaying the analysis result of the IQ data by the IQ data analysis unit  27 , reads the analysis result screens  40   a  and  40   b  according to the operation contents of the operation unit  29 , and displays the analysis result screens  40   a  and  40   b  on the analysis result display unit  28   c.    
     The operation unit  29  is composed of an input device such as a keyboard, dial or mouse, a display for displaying test conditions, control circuits and software for controlling these, and is operated by the examiner to input each test condition, and set display contents of the display unit  28 . 
     The operation of the base station simulator  10  having the above-described configuration will be described below. As described above, in the base station simulator  10 , in the test performed according to the test scenario under the control of the pseudo base station control unit  20   a,  the RF signal (signal to be measured) including the uplink data from the UE  70  is received by the reception unit  21   a,  and the signal data including the IQ data is calculated by the signal processing in the analog signal processing unit  22 . 
     The signal data calculated by the analog signal processing unit  22  is input to the uplink layer processing unit  23  and subjected to signal processing of each layer, and the signal data after signal processing of the PHY layer and the MAC layer is input to the trigger detection unit  25 . The signal data (IQ data) calculated by the analog signal processing unit  22  is also input to the IQ data memory unit  26 . 
     In the base station simulator  10  having such an uplink signal processing function, in order to analyze the signal data input from the analog signal processing unit  22  to the IQ data memory unit  26 , it is necessary to set the trigger condition for issuing the trigger signal that activates the acquisition operation of the IQ data to be analyzed in the IQ data memory unit  26 . 
     The trigger condition setting processing operation in the base station simulator  10  will be described with reference to the flowchart shown in  FIG. 3 . 
     In order to set the trigger condition in the base station simulator  10 , first, the operation unit  29  performs a predetermined trigger setting start operation. 
     By this trigger setting start operation, the trigger setting unit  20   b  causes the trigger setting display unit  28   b  of the display unit  28  to display the trigger condition setting screen  30  (step S 1 ). 
     As shown in  FIG. 2 , the setting screen  30  includes, for example, a cell designation tool  31 , a trigger type designation tool  32 , a reception status designation tool  33 , an OK button  34 , and a cancel button  35 . The cell designation tool  31  is for selectively designating a pseudo base station (cell) to be analyzed for IQ data. The trigger type designation tool  32  is for selectively designating the signal type (trigger type) to be analyzed. The reception status designation tool  33  is for selectively designating the communication state (reception status) of the signal to be analyzed. The OK button  34  is a tool for instructing the start of setting, and the cancel button  35  is a tool for instructing cancellation of the setting. 
     After the setting screen  30  is displayed in step S 1 , the trigger setting unit  20   b  receives the designation of the cell to be analyzed by the cell designation tool  31  on the setting screen  30  (step S 2 ). The cell option is all pseudo base stations under the control of the pseudo base station control unit  20   a.    
     Next, the trigger setting unit  20   b  receives the designation of the trigger type by the trigger type designation tool  32  on the setting screen  30  (step S 3 ). The trigger type option is, for example, either ULSCH, UCI (SR), UCI (CSI), UCI (HARQ-ACK), PRACH or SRS. 
     Subsequently, the trigger setting unit  20   b  receives the designation of the reception status of the signal to be analyzed by the reception status designation tool  33  on the setting screen  30  (step S 4 ). Examples of the communication state options include DTX, CRC NG, CRC OK, or Decode NG, Decode OK and the like. 
     Further, the trigger setting unit  20   b  monitors whether or not the OK button  34  on the setting screen  30  is pressed, and when the OK button  34  is pressed, the trigger setting unit  20   b  sets the trigger condition including each item designated in the above steps S 2  to S 4  (step S 5 ), and completes a series of trigger condition setting processes. 
       FIG. 2  shows a display example of the setting screen  30  at the time of setting a trigger condition in which the cell to be analyzed is a cell having an identifier of “CELL #1”, the trigger type is “UL-SCH”, and the reception status is “CRC NG”. 
     The trigger condition set as described above is passed from the trigger setting unit  20   b  to the trigger detection unit  25 . The trigger detection unit  25  monitors whether or not the communication state satisfies the trigger condition acquired from the trigger setting unit  20   b.  When it is detected that the communication state satisfies the trigger condition, the trigger detection unit  25  outputs a trigger signal to the IQ data memory unit  26  at a predetermined timing. 
     According to the trigger condition set on the setting screen  30  shown in  FIG. 2 , the base station simulator  10  outputs the trigger signal when the signal data using the UL-SCH of the uplink data from the UE  70  is CRC NG, in the simulated communication between the cell having the identifier of “CELL #1” and the UE  70 . 
     When the IQ data memory unit  26  receives the trigger signal, the IQ data memory unit  26  acquires (stores) IQ data in a predetermined section (corresponding to the predetermined timing) as an analysis target from the signal data calculated by the analog signal processing unit  22 . Then, the IQ data analysis unit  27  executes the analysis process on the IQ data stored in the IQ data memory unit  26 . 
     Next, the IQ data analysis processing operation in the base station simulator  10  will be described with reference to the flowchart shown in  FIG. 4 . Here, it is assumed that the base station simulator  10  performs the test of the UE  70  according to the test scenario under the control of the pseudo base station control unit  20   a  and transmit and receive a radio frequency signal to and from the UE  70 . It is premised that the IQ data analysis process in the base station simulator  10  is performed on the uplink data transmitted from the UE  70  to the base station simulator  10  in the test. 
     In performing the IQ data analysis process, the trigger detection unit  25  acquires and holds the trigger condition set by the trigger setting unit  20   b  (step S 11 ). 
     After that, when the test of the UE  70  is started under the control of the pseudo base station control unit  20   a,  the radio frequency signal is transmitted and received to and from the UE  70 , and the uplink data from the UE  70  is received by the reception unit  21   a  (step S 12 ), and is input to the analog signal processing unit  22 . 
     Next, the analog signal processing unit  22  receives the uplink data input from the reception unit  21   a  as a signal to be measured, converts the signal to be measured from an analog signal to a digital signal, and executes an arithmetic process for calculating signal data (IQ data) (step S 13 ). 
     The signal data calculated by the arithmetic process in step S 13  is transmitted to the uplink layer processing unit  23  and the IQ data memory unit  26  (step S 14 ). 
     The uplink layer processing unit  23  sequentially performs the processes of the PHY layer, the MAC layer, the RLC layer, the PDCP layer, and the RRC layer on the signal data from the analog signal processing unit  22  (step S 15 ). Then, the processed signal data is transmitted to the log data generation unit  24 , and the signal data of the PHY layer and the MAC layer is transmitted to the trigger detection unit  25 . 
     The trigger detection unit  25  collates the input signal data of the PHY layer and the MAC layer with the trigger condition that has already been acquired (see step S 11 ), and determines whether or not the communication state of the signal data satisfies the trigger condition (step S 16 ). In a case where it is determined that the communication state of the signal data does not satisfy the trigger condition (NO in step  16 ), the processes of step S 12  and subsequent steps are continued. 
     On the other hand, in a case where it is determined that the communication state of the signal data satisfies the trigger condition (YES in step  16 ), the trigger detection unit  25  outputs the trigger signal to the IQ data memory unit  26  at a predetermined timing (step S 17 ). 
     The IQ data memory unit  26  is composed of a ring buffer memory having a predetermined storage capacity, and always stores (secures) the latest signal data of the above storage capacity among the signal data input from the analog signal processing unit  22 . When the IQ data memory unit  26  receives the trigger signal output by the trigger detection unit  25 , the IQ data memory unit  26  extracts IQ data in a predetermined section corresponding to the predetermined timing described above from the secured signal data (step S 18 ). 
     Next, in the IQ data analysis unit  27 , the IQ data reading unit  27   a  reads IQ data in a predetermined section from the IQ data memory unit  26 , and the data analysis unit  27   c  executes an analysis process of the read IQ data (step S 19 ). Here, the data analysis unit  27   c  analyzes the read IQ data, based on the IQ analysis parameters read from the log data by the parameter reading unit  27   b.    
     During the execution of the IQ data analysis process in step S 19 , the display control unit  20   d  executes a control for displaying the analysis result of the IQ data by the data analysis unit  27   c  on the analysis result display unit  28   c.    FIGS. 6 and 7  show display examples of IQ data analysis results on the analysis result display unit  28   c.  In both the analysis result screen  40   a  shown in  FIG. 6  and the analysis result screen  40   b  shown in  FIG. 7 , a so-called constellation display form in which points corresponding to each measured value of the signal to be measured (multi-level quadrature modulation signal) are arranged on the IQ coordinate plane is adopted. 
     The analysis result screen  40   a  shown in  FIG. 6  shows, for example, a display example of the analysis result of IQ data corresponding to the case where the reception status is set to a value corresponding to the communication failure such as “CRC NG”, for example, in the setting of the trigger condition using the setting screen  30  shown in  FIG. 2 . According to the constellation display form of the analysis result screen  40   a,  the points corresponding to the measured values on the IQ coordinate plane are observed to be present at positions significantly deviated from the ideal measurement points of the multi-level quadrature modulation signal. 
     The analysis result screen  40   b  shown in  FIG. 7  shows, for example, a display example of the analysis result of IQ data corresponding to the case where the reception status is set to a value corresponding to the communication success such as “CRC OK”, for example, in the setting of the trigger condition using the setting screen  30  shown in  FIG. 2 . According to the constellation display form of the analysis result screen  40   b,  the points corresponding to the measured values on the IQ coordinate plane are observed to be present at positions close to the ideal measurement points of the multi-level quadrature modulation signal. 
     When the IQ data analysis process in step S 19  is completed, the pseudo base station control unit  20   a  performs controls to end the series of IQ data analysis processes. 
     According to the base station simulator  10  that sets the trigger condition by using the setting screen  30  shown in  FIG. 2  and executes the IQ data analysis process according to the flowchart shown in  FIG. 4 , regarding the signal processing of the PHY layer of the uplink data from the UE  70 , it becomes possible to analyze IQ data according to the above-described test scenarios 1 to 3 and the like. 
     The present embodiment illustrates an example in which the signal data (the signal stored corresponding to the output of the trigger signal) extracted by the IQ data memory unit  26  is the signal data of the physical layer (PHY layer) and the trigger condition set by the trigger setting unit  20   b  is contents including the trigger type and the reception status, but the present invention is not limited to this. For example, the trigger condition may be the information form including the information managed in accordance with each pseudo base station under the control of the pseudo base station control unit  20   a,  for example, the act time (the period for activating the communication operation of the pseudo base station). 
     As described above, the base station simulator  10  according to the present embodiment includes a reception unit  21   a  that receives a signal to be measured transmitted from the UE  70 , an analog signal processing unit  22  that converts the signal to be measured into a digital signal and calculates signal data, a trigger detection unit  25  that outputs a trigger signal at a predetermined timing when a predetermined trigger condition is satisfied, an IQ data memory unit  26  that receives the trigger signal and extracts IQ data in a predetermined section according to a predetermined timing from the signal data, and an IQ data analysis unit  27  that analyzes the extracted IQ data. 
     With this configuration, the base station simulator  10  according to the present embodiment can acquire IQ data in a predetermined section of the signal to be measured and analyze the IQ data only under a communication state satisfying the trigger condition, and can support a detailed analysis process of the IQ data at a desired signal type, channel, or reception status level, depending on the setting of the trigger condition. 
     Further, the base station simulator  10  according to the present embodiment has a configuration in which a predetermined section according to a predetermined timing starts before the predetermined timing. With this configuration, the base station simulator  10  according to the present embodiment can extract, as an analysis target, IQ data in a predetermined section starting from a time point before it is determined that the trigger condition is satisfied, and can reliably analyze the IQ data under the reception status satisfying the trigger condition. 
     Further, the base station simulator  10  according to the present embodiment further includes an IQ data memory unit  26  that stores the signal data calculated by the analog signal processing unit  22  in a ring buffer memory, and the IQ data memory unit  26  extracts signal data in a predetermined section from the signal data stored in the ring buffer memory. 
     With this configuration, the base station simulator  10  according to the present embodiment can always secure the latest fixed amount of signal data among the signal data sequentially calculated by the analog signal processing unit  22  in the ring buffer memory, and reliably extract IQ data in a predetermined section starting from a time point before it is determined that the trigger condition is satisfied. 
     Further, the base station simulator  10  according to the present embodiment has a configuration to output a trigger signal when the signal data extracted by the IQ data memory unit  26  is the signal data of the physical layer, and the predetermined trigger condition is either ULSCH, UCI (SR), UCI (CSI), UCI (HARQ-ACK), PRACH or SRS, the total received power (total Power) is equal to or higher than a predetermined threshold, and the reception status is DTX, CRC NG, CRC OK, Decode NG, or Decode OK. 
     With this configuration, the base station simulator according to the present embodiment can implement detailed analysis of IQ data at the reception status level such as DTX, CRC NG, CRC OK, or Decode NG, Decode OK for ULSCH, UCI (SR), UCI (CSI), UCI (HARQ-ACK), PRACH, SRS, or the like which are related to communication at the physical layer, depending on the setting of a predetermined trigger condition. 
     Further, in the base station simulator  10  according to the present embodiment, the signal data extracted by the IQ data memory unit  26  is the signal data of the physical layer, and the trigger condition is managed in accordance with a pseudo base station that simulates communication with the UE  70 , and includes a period (act time) for activating the communication operation of the pseudo base station. 
     With this configuration, the base station simulator  10  according to the present embodiment operates to receive the signal to be measured at a timing managed by the pseudo base station by setting a predetermined act time as a predetermined trigger condition, and can reliably analyze the IQ data included in the signal to be measured at that time. 
     Further, the measuring method according to the present embodiment is a measuring method for measuring a signal to be measured received from a UE  70  by using a measuring device  1  (or a base station simulator  10 ) that tests the operation of the communication function of the UE  70  by performing communication simulating a base station with the UE  70  that transmits and receives radio frequency signals, and includes a trigger condition acquisition step (S 11 ) of acquiring an arbitrary channel of a physical layer used for receiving the signal to be measured, a predetermined trigger condition in which the reception status of the signal to be measured in the channel is designated, a reception step (S 12 ) of receiving the signal to be measured from the UE  70 , a signal data calculation step (S 13 ) of converting the signal to be measured into a digital signal and calculating signal data, a trigger signal output step (S 17 ) of outputting a trigger signal at a predetermined timing when a predetermined trigger condition is satisfied, a signal extraction step (S 18 ) of receiving the trigger signal and extracting IQ data in a predetermined section according to a predetermined timing from the signal data, and an IQ data analysis step (S 19 ) of analyzing the extracted IQ data. 
     With this configuration, the measuring method according to the present embodiment can acquire IQ data in a predetermined section of the signal to be measured and analyze the IQ data only under a communication state satisfying the trigger condition, and can support a detailed analysis process of the IQ data at a desired signal type, channel, or reception status level, depending on the setting of the trigger condition. 
     (Second Embodiment) 
     Next, the configuration of the measuring device  1  according to a second embodiment will be described with reference to  FIG. 8 . 
     As shown in  FIG. 8 , a measuring device  1  according to the present embodiment has a system configuration in which a base station simulator signal processing device  10 A and a base station simulator control device  50  are communicably connected via a hub  60 . The base station simulator control device  50  is connected to the hub  60  by, for example, a network  65  using Ethernet (registered trademark). 
     The base station simulator signal processing device  10 A has a conceptual configuration equivalent to that of the base station simulator  10  (see  FIG. 1 ) according to the first embodiment, except for some functional blocks. The base station simulator signal processing device  10 A according to the present embodiment operates as a base station simulator under the control of the base station simulator control device  50 , and a pseudo base station control function unit that performs communication simulating a base station with the UE  70  (equivalent to the UE  70  in the first embodiment), a function unit that controls the analysis of IQ data, a function unit that displays the analysis result of IQ data, or the like are entrusted to the control functions of the base station simulator control device  50 . 
     As shown in  FIG. 8 , the base station simulator signal processing device  10 A includes a transmission/reception unit  11  having a reception unit  11   a  and a transmission unit  11   b,  a signal data calculation unit  12 , a trigger signal output unit  13 , a signal extraction unit  14 , a storage unit  15 , and an external interface (I/F) unit  16 . 
     In the base station simulator signal processing device  10 A, the reception unit  11   a  corresponds to the reception unit  21   a  of the base station simulator  10  according to the first embodiment. The signal data calculation unit  12  also corresponds to the analog signal processing unit  22  and the uplink layer processing unit  23 . The trigger signal output unit  13  also corresponds to the trigger detection unit  25 . The signal extraction unit  14  and the storage unit  15  also correspond to the IQ data memory unit  26 . The external interface (I/F) unit  16  is interface means for transmitting and receiving signals to and from the hub  60 . 
     The base station simulator control device  50  is composed of, for example, a computer device such as a personal computer (PC), and functions as a control PC that comprehensively controls various control operations of the base station simulator signal processing device  10 A for testing the UE  70 . As shown in  FIG. 8 , the base station simulator control device  50  includes a control unit  51 , an IQ data analysis unit  52 , an external interface (I/F) unit  53 , a display unit  54 , and an operation unit  55 . 
     In the base station simulator control device  50 , the control unit  51  has a control function equivalent to that of the control unit  20  of the base station simulator  10  according to the first embodiment. That is, the control unit  51  includes a pseudo base station control unit  51   a,  a trigger setting unit  51   b,  an analysis control unit  51   c,  and a display control unit  51   d  respectively equivalent to the pseudo base station control unit  20   a,  the trigger setting unit  20   b,  the analysis control unit  20   c,  and the display control unit  20   d  in the control unit  20  of the base station simulator  10  according to the first embodiment. Further, in the base station simulator control device  50 , the IQ data analysis unit  52  is equivalent to the IQ data analysis unit  27  of the base station simulator  10  according to the first embodiment. The display unit  54  and the operation unit  55  are equivalent to the display unit  28  and the operation unit  29 , respectively. The external interface (I/F) unit  53  is interface means for transmitting and receiving signals to and from the hub  60  via the network  65 . 
     In the measuring device  1  having the system configuration shown in  FIG. 8 , the base station simulator signal processing device  10 A and the base station simulator control device  50  operate as follows, respectively. The reception unit  11   a  receives the signal to be measured transmitted from the UE  70  (see step S 12  in  FIG. 4 ). The signal data calculation unit  12  converts the signal to be measured into a digital signal and executes a process of calculating the signal data (see step S 13  in  FIG. 4 ). The trigger signal output unit  13  outputs a trigger signal at a predetermined timing when a predetermined trigger condition is satisfied (see step S 17  in  FIG. 4 ). Upon receiving the trigger signal, the signal extraction unit  14  extracts IQ data in a predetermined section according to a predetermined timing from the signal data calculated by the signal data calculation unit (see step S 18  in  FIG. 4 ). Specifically, IQ data in a predetermined section is stored in the storage unit  15  composed of the ring buffer memory. Then, in the base station simulator control device  50 , the IQ data analysis unit  52  executes an analysis process of IQ data in a predetermined section stored in the ring buffer memory (see step S 19  in  FIG. 4 ). 
     As described above, in the measuring device  1  according to the second embodiment, the base station simulator signal processing device  10 A and the base station simulator control device  50  cooperate as a system to implement the IQ data analysis processing function similar to that of the single base station simulator  10  according to the first embodiment. That is, in the measuring device  1  according to the present embodiment, a control function for setting a trigger condition, outputting a trigger signal in a communication state satisfying the trigger condition, acquiring IQ data in a predetermined range in the PHY layer, and performing analysis thereof is the same as the base station simulator  10  according to the first embodiment. Thus, the measuring device  1  according to the second embodiment can be expected to have the same effect as the effect of the base station simulator  10  according to the first embodiment. 
     Further, the measuring device  1  according to the present embodiment has a configuration in which the signal extraction unit  14  (IQ data memory unit) and the IQ data analysis unit  52  are connected by a wired cable. With this configuration, the measuring device  1  according to the present embodiment can connect the same type of measuring devices in parallel when the number of base stations further increases, and can cope with the case where the signals to be transmitted and received increase. 
     In each of the above embodiments, the operation mode of 5G NR is illustrated, but the present invention can also be applied to an operation mode in which 5G NR and LTE are mixed, or a future operation mode in which 5G NR and the next communication standard are mixed. 
     INDUSTRIAL APPLICABILITY 
     As described above, a measuring device and a measuring method according to the present invention have an effect capable of setting conditions including a signal type, a channel, and a reception status, and performing detailed analysis of IQ data corresponding to a communication state satisfying the conditions, and are useful in general for measuring devices and measuring methods that perform analysis by setting conditions for uplink data from mobile terminals. 
     DESCRIPTION OF REFERENCE NUMERALS AND SIGNS 
       1  Measuring device 
       10  Base station simulator 
       10 A Base station simulator signal processing device 
       11   a  Reception unit 
       12  Signal data calculation unit 
       13  Trigger signal output unit 
       14  Signal extraction unit 
       15  storage unit 
       21   a  Reception unit 
       22  Analog signal processing unit (signal data calculation unit) 
       23  Uplink layer processing unit (signal data calculation unit) 
       25  Trigger detection unit (trigger signal output unit) 
       26  IQ data memory unit (signal extraction unit, storage unit) 
       27  IQ data analysis unit 
       50  Base station simulator control device 
       52  IQ data analysis unit 
       70  UE (User Equipment: mobile terminal) 
     UL-RACH UpLink-Random Access Channel 
     UL-SCH Uplink Shared CHannel 
     PRACH (Physical Random Access CHannel) Random access physical channel 
     PUSCH Physical Uplink Shared CHannel 
     PUCCH Physical Uplink Control CHannel 
     UCI Uplink Control Information 
     SR (Scheduling Request) Schedule request signal 
     CSI (Channel State Information) Channel status information 
     HARQ-ACK (Hybrid Automatic Repeat reQuest ACKnowledgement) Request response signal 
     UCI (SR) UCI with SR inserted 
     UCI (CSI) UCI with CSI inserted 
     UCI (HARQ-ACK) UCI with HARQ-ACK inserted 
     SRS (Sounding Reference Signal) Sounding reference signal 
     DTX (Discontinuous Transmission) voice signal non-input state information 
     CRC NG Cyclic Redundancy Check (CRC) failure information 
     CRC OK CRC success information 
     Decode NG Decoding failure information 
     Decode OK Decoding success information