Mobile terminal test device and mobile terminal test method

Abstract

To provide a mobile terminal test device capable of testing a case where a UL carrier for transmitting a UL signal changes on a slot-by-slot basis, such as UL switching.SOLUTION: A mobile terminal test device 1 includes a pseudo base station unit 16 that simulates a base station that communicates with a mobile terminal 2, a scheduling information setting unit 12b that sets scheduling information that specifies either a first carrier or a second carrier used for an uplink from the mobile terminal to the base station for each uplink slot, a base station control unit 13 that controls the pseudo base station unit on the basis of the scheduling information, a first RF measurement unit 14 that measures a first UL signal transmitted from the mobile terminal to the pseudo base station unit using the first carrier on the basis of the scheduling information, and a second RF measurement unit 15 that measures a second UL signal transmitted from the mobile terminal to the pseudo base station unit using the second carrier on the basis of the scheduling information.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a mobile terminal test device and a mobile terminal test method for testing a mobile terminal. [Background technology]

[0002] When developing a mobile terminal such as a mobile phone, a data communication terminal, or an in-vehicle communication terminal, it is necessary to test whether the developed mobile terminal can communicate normally. For this reason, the mobile terminal to be tested is connected to a test device that operates as a pseudo base station that simulates the functions of an actual base station, and communication is performed between the test device and the mobile terminal, and the content of this communication is confirmed (for example, see Patent Document 1).

[0003] Patent Document 1 discloses a mobile terminal testing device that, in a mobile terminal test, displays setting information for each multiplexed signal that constitutes a multiplexed signal on one screen and is capable of changing selected setting information. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-175028 Summary of the Invention [Problem to be solved by the invention]

[0005] In order to improve the capacity and latency of the uplink (UL) from a mobile terminal to a base station, there is a known technology or function called "Uplink Tx Switching" (hereinafter referred to as UL switching) that switches the cell or frequency band that transmits the UL signal on a slot-by-slot basis. For example, see 3GPP (3rd Generation Partnership Project) TS38.214 6.1.6. For this reason, it is necessary to test the UL switching function of the mobile terminal.

[0006] However, conventional mobile terminal test equipment such as that described in Patent Document 1 had the problem that it was not possible to test cases where the UL carrier changes, such as the cell or frequency band that transmits the UL signal for each slot, as in UL switching.

[0007] The present invention has been made to solve these problems, and aims to provide a mobile terminal testing device and a mobile terminal testing method that can test cases where the UL carrier changes, such as cells or frequency bands that transmit UL signals on a slot-by-slot basis, such as UL switching. [Means for solving the problem]

[0008] The mobile terminal test device of the present invention is a mobile terminal test device (1) for testing a mobile terminal (2), and is characterized in that it comprises: a pseudo base station unit (16) for simulating a base station communicating with the mobile terminal; a setting unit (12) for setting scheduling information that specifies either a first carrier or a second carrier used for an uplink from the mobile terminal to the base station for each slot of the uplink; a control unit (13) for controlling the pseudo base station unit based on the scheduling information; a first measurement unit (14) for measuring a first uplink signal transmitted from the mobile terminal to the pseudo base station unit using the first carrier based on the scheduling information; and a second measurement unit (15) for measuring a second uplink signal transmitted from the mobile terminal to the pseudo base station unit using the second carrier based on the scheduling information.

[0009] With this configuration, the mobile terminal test device of the present invention can set scheduling information suitable for the test even in a case where the UL carrier changes on a slot-by-slot basis, such as in UL switching, by the setting unit. Also, since the mobile terminal test device is provided with a first measurement unit corresponding to the first carrier and a second measurement unit corresponding to the second carrier separately, and can measure the first UL signal and the second UL signal simultaneously or in parallel based on the scheduling information suitable for the test, it can perform a test even in a case where the UL carrier changes on a slot-by-slot basis, such as in UL switching.

[0010] In addition, in the mobile terminal test equipment of the present invention, the first carrier may be a carrier of a first cell in Frequency Division Duplex (FDD), and the second carrier may be a carrier of a second cell in Time Division Duplex (TDD).

[0011] With this configuration, the mobile terminal test device of the present invention can test cases where the cell that transmits the UL signal changes on a slot-by-slot basis, such as UL switching based on carrier aggregation (CA).For example, in an area where both the primary component carrier (PCC) of the primary cell (PCell) of FDD and the secondary component carrier (SCC) of the secondary cell (SCell) of TDD can be used, the mobile terminal capable of inter-band 2 Carrier Aggregation (inter-band 2CA) can test the UL switching function of switching the UL carrier between the PCC and SCC.

[0012] In addition, in the mobile terminal test equipment of the present invention, the first carrier may be a carrier in a first frequency band of time division duplex (TDD), and the second carrier may be a carrier in a second frequency band of the same cell as the first frequency band.

[0013] With this configuration, the mobile terminal test device of the present invention can test cases where the frequency band for transmitting UL signals changes on a slot-by-slot basis, such as UL switching. For example, it is possible to test the UL switching function that improves UL capacity and latency by switching the UL carrier between SUL and NUL, so as to use a Supplementary Uplink (SUL) in slots to which a TDD Normal Uplink (NUL) slot is not assigned.

[0014] In addition, the mobile terminal test device of the present invention may be configured to further include a display unit (18) that displays a time waveform of the first uplink signal measured by the first measurement unit and a time waveform of the second uplink signal measured by the second measurement unit on the same time axis.

[0015] With this configuration, the mobile terminal test device of the present invention can easily check the switching period required to switch between the first UL signal and the second UL signal, which makes it easy to perform time mask measurement even in testing the UL switching function.

[0016] In addition, in the mobile terminal test equipment of the present invention, the setting unit may set the scheduling information so that switching between the first carrier and the second carrier in the uplink is performed within a slot of either the first carrier or the second carrier, and the display unit may be configured to further display on the same time axis the range of the slots in which the switching is performed.

[0017] With this configuration, the mobile terminal test device of the present invention can easily determine whether or not a slot or carrier in which UL switching has been performed is appropriate.

[0018] In addition, the mobile terminal test method of the present invention is characterized in that it includes a pseudo base station unit (16) that simulates a base station that communicates with a mobile terminal (2), and a mobile terminal test device (1) that tests the mobile terminal sets scheduling information that specifies either a first carrier or a second carrier used for an uplink from the mobile terminal to the base station for each slot of the uplink, controls the pseudo base station unit based on the scheduling information, measures a first uplink signal transmitted from the mobile terminal to the pseudo base station unit using the first carrier based on the scheduling information, and measures a second uplink signal transmitted from the mobile terminal to the pseudo base station unit using the second carrier based on the scheduling information.

[0019] With this configuration, the mobile terminal test method of the present invention can set scheduling information suitable for the test even in a case where the UL carrier changes on a slot-by-slot basis, such as in UL switching. Also, since the first UL signal transmitted by the first carrier and the second UL signal transmitted by the second carrier can be measured simultaneously or in parallel based on the scheduling information suitable for the test, it can be used to test even in a case where the UL carrier changes on a slot-by-slot basis, such as in UL switching. Effect of the Invention

[0020] According to the present invention, it is possible to provide a mobile terminal testing device and a mobile terminal testing method capable of testing cases in which the UL carrier changes, such as a cell or frequency band that transmits a UL signal on a slot-by-slot basis, as in UL switching. [Brief description of the drawings]

[0021] [Figure 1]1 is a block diagram showing a configuration of a mobile terminal test device according to an embodiment of the present invention; [Diagram 2] 1A and 1B are diagrams showing examples of antenna configurations of a mobile terminal, where (a) shows the antenna configuration when FDD is used for the uplink, and (b) shows the antenna configuration when TDD is used for the uplink. [Diagram 3] FIG. 1 is a diagram for explaining UL switching (CA-based UL switching) for switching a cell used on a slot-by-slot basis. [Figure 4] 4 is a diagram showing an example of allocation to each slot in the uplink or downlink direction in the UL switching shown in FIG. 3. [Diagram 5] FIG. 1 is a diagram explaining UL switching (SUL-based UL switching) in which frequency bands are switched on a slot-by-slot basis. [Figure 6] 6 is a diagram showing an example of allocation to each slot in the uplink or downlink direction in the UL switching shown in FIG. 5. FIG. [Figure 7] 1A and 1B are diagrams showing the time position of a switching period Ts in carrier switching, where (a) shows a case where UL switching is performed on carrier 1, and (b) shows a case where UL switching is performed on carrier 2. FIG. [Figure 8] FIG. 11 is a diagram showing an example of scheduling information in UL switching (CA-based UL switching) in which a cell in use is switched on a slot-by-slot basis. [Figure 9] FIG. 11 is a diagram showing an example of scheduling information for UL switching (SUL-based UL switching) in which frequency bands are switched on a slot-by-slot basis. [Figure 10] 1A and 1B show signal paths from a mobile terminal to a mobile terminal test device in testing a CA-based UL switching function, where (a) shows the signal path of a UL signal of a primary cell, and (b) shows the signal path of a UL signal of a secondary cell. [Figure 11] 1A and 1B show signal paths from a mobile terminal to a mobile terminal testing device in testing a SUL-based UL switching function, where (a) shows the signal path of a NUL signal and (b) shows the signal path of a SUL signal. [Figure 12] 11A and 11B are diagrams showing examples of images displayed on a display unit of a mobile terminal test device according to an embodiment of the present invention; [Figure 13] 4 is a flowchart showing the procedure of a mobile terminal testing method according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0023] Fig. 1 is a block diagram showing the configuration of a mobile terminal test device 1 according to this embodiment. The mobile terminal test device 1 tests a mobile terminal 2 by simulating a mobile communication base station in accordance with scheduling information. As shown in Fig. 1, the mobile terminal test device 1 includes a processing unit 10, a pseudo base station unit 16, an operation unit 17, a display unit 18, and a storage unit 19. Each component will be described below.

[0024] The processing unit 10 performs processes such as test preparation, execution, measurement, analysis, and evaluation, and, as shown in Fig. 1, includes a test control unit 11, a setting unit 12, a base station control unit 13, a first RF measurement unit 14, and a second RF measurement unit 15. The first RF measurement unit 14 and the second RF measurement unit 15 correspond to the first measurement unit and the second measurement unit of the present invention, respectively, and the base station control unit 13 (which may include the test control unit 11) corresponds to the control unit of the present invention.

[0025] The test control unit 11 controls the execution of a test based on scenario information and / or scheduling information for executing a test of the mobile terminal 2, obtains the results of the test, and evaluates them as necessary. In the test, for example, the UL switching function of the mobile terminal 2, which will be described later, is checked. The evaluation is performed based on evaluation criteria set for each test.

[0026] The setting unit 12 generates or sets information required for executing a test of the mobile terminal 2, and includes a scenario information setting unit 12a and a scheduling information setting unit 12b.

[0027] The scenario information setting unit 12a generates or sets scenario information. The scenario information includes information on an operation sequence in which the operation of the mobile terminal test device 1 is set, and a communication sequence in which signals to be transmitted and received from the mobile terminal 2 are set.

[0028] The scheduling information setting unit 12b generates or sets the scheduling information. The scheduling information is information that specifies either the first carrier or the second carrier as communication resources (cell, frequency band, etc.) used for the uplink from the mobile terminal 2 to the base station for each uplink slot. The scheduling information setting unit 12b generates or sets the scheduling information based on test parameters indicating test items, etc., input by the user via the operation unit 17. Figs. 8 and 9 show examples of the scheduling information set by the scheduling information setting unit 12b, as will be described later.

[0029] Specifically, the first carrier as a communication resource is, for example, an UL carrier of a first cell in FDD, and the second carrier as a communication resource is, for example, an UL carrier of a second cell in TDD. More specifically, the first cell is a PCell, and the second cell is a SCell.

[0030] Furthermore, the first carrier as a communication resource may be, for example, a UL carrier of a first frequency band of TDD, and the second carrier may be, for example, a UL carrier of a second frequency band of the same cell as the first frequency band. Specifically, the first frequency band may be a NUL, and the second frequency band may be a SUL.

[0031] Furthermore, the scheduling information setting unit 12b may set the scheduling information so that switching between the first carrier and the second carrier in the uplink is performed within a slot of either the first carrier or the second carrier.

[0032] The base station control unit 13 controls the pseudo base station unit 16 based on the scenario information and / or scheduling information, and executes a test by having the pseudo base station unit 16 communicate with the mobile terminal 2. Specifically, the base station control unit 13 generates or acquires transmission data such as an RRC (Radio Resource Control) message and DCI (Downlink Control Information) based on the scenario information and / or scheduling information, and causes the pseudo base station unit 16 to transmit the data to the mobile terminal 2, and causes the pseudo base station unit 16 to establish a call connection between the pseudo base station unit 16 and the mobile terminal 2 and execute a predetermined communication sequence.

[0033] The pseudo base station unit 16 simulates a base station that communicates with the mobile terminal 2 under the control of the base station control unit 13 or the test control unit 11. The pseudo base station unit 16 simulates a base station that operates according to, for example, the 5G (5th Generation) NR (New Radio) communication standard or the 4G (LTE (Long Term Evolution) or LTE-A) communication standard. The pseudo base station unit 16 transmits and receives signals to and from the mobile terminal 2 by wired means via a coaxial cable or the like, or wirelessly via an antenna. The pseudo base station unit 16 performs down-conversion, A / D (Analog-to-digital) conversion, quadrature demodulation, and the like on the signal received from the mobile terminal 2 to obtain I / Q (In-Phase / Quadrature-Phase) data. The I / Q data is sent to the first RF measurement unit 14 and the second RF measurement unit 15.

[0034] The first RF measurement unit 14 measures the first UL signal transmitted from the mobile terminal 2 to the pseudo base station unit 16 using the first carrier based on the scheduling information, and sends the measurement result to the test control unit 11. The second RF measurement unit 15 measures the second UL signal transmitted from the mobile terminal 2 to the pseudo base station unit 16 using the second carrier based on the scheduling information, and sends the measurement result to the test control unit 11. Specifically, the first RF measurement unit 14 and the second RF measurement unit 15 each acquire I / Q data from the pseudo base station unit 16, for example, and perform demodulation processing and analysis (measurement) processing on the I / Q data. In addition, the first RF measurement unit 14 and the second RF measurement unit 15 measure the power of the first UL signal and the second UL signal, respectively. The first RF measurement unit 14 and the second RF measurement unit 15 may measure the power or signal waveform of the first UL signal and the second UL signal before, during, and after the UL switching based on the scheduling information (see FIG. 12). The measurement results are sent to the test control unit 11.

[0035] The operation unit 17 is configured to include, for example, any combination of a touch pad constituting a touch panel, a pointing device such as a mouse or a tracking ball, a keyboard device, etc. The operation unit 17 accepts operations for the test control unit 11, such as selection of a test item, an instruction to execute a test, setting of test parameters, and an instruction to display test results. Examples of test parameters include parameters indicating whether or not a UL switching function test is performed, a switching period, and a carrier in which the switching period is placed. Information input by the operation unit 17 is sent to the test control unit 11.

[0036] The display unit 18 includes an image display device such as a liquid crystal display, and is configured to display the settings of scenario information and scheduling information, test results, etc. The display unit 18 displays the time waveform of the first UL signal measured by the first RF measurement unit 14 and the time waveform of the second UL signal measured by the second RF measurement unit 15 on the same time axis. In addition to these time waveforms, the display unit 18 further displays the range of carriers or slots, for example, the range of slots where UL switching has been performed, on the same time axis.

[0037] The storage unit 19 is composed of, for example, a random access memory (RAM), a hard disk drive (HDD), a solid state memory (SSD), a flash memory, etc., and stores information related to tests. The storage unit 19 includes a scenario information storage unit 19a and a scheduling information storage unit 19b. The scenario information storage unit 19a stores scenario information, test parameters, test result information, etc., generated or set by the scenario information setting unit 12a. The scenario information includes test parameters indicating whether or not a test of the UL switching function has been performed. The scheduling information storage unit 19b stores the scheduling information generated or set by the scheduling information setting unit 12b.

[0038] The mobile terminal test device 1 is configured by a computer device (not shown) provided with a communication module for communicating with the mobile terminal 2. This computer device has, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM, an external storage device such as a HDD or a flash memory, an input / output port, and a touch panel (all not shown).

[0039] The ROM and external storage device of this computer device store a program for causing the computer device to function as the mobile terminal test device 1. That is, the CPU executes a program stored in the ROM or the like using the RAM as a working area, whereby the computer device functions as the mobile terminal test device 1.

[0040] In this embodiment, the storage unit 19 is configured by a RAM or an external storage device, the processing unit 10 is configured by a CPU, etc., and the pseudo base station unit 16 is configured by a communication module. The pseudo base station unit 16 may be configured as a separate device from the computer device that configures the processing unit 10, etc.

[0041] <Mobile terminal> Some general commercial mobile terminals (UE: User Equipment) can only use a maximum of two transmitters (Tx) for uplink due to hardware limitations. Figure 2 is a diagram showing an example of an antenna configuration of such a mobile terminal 2. Figure 2(a) shows a case where an antenna 2a is used, for example, in the 2.1 GHz band for uplink and downlink in an FDD cell. Figure 2(b) shows a case where both antennas 2a and 2b are used, for example, in the 3.5 GHz band for uplink in a TDD cell. In this way, the antenna 2a of the mobile terminal 2 can be switched between the 2.1 GHz band and the 3.5 GHz band for use.

[0042] In areas where TDD can be used, using MIMO (Multi Input Multi Output) at higher frequencies will increase data rates. Also, TDD bands generally have higher frequency bands than FDD bands, and are advantageous in terms of bandwidth (the higher the frequency band, the larger the bandwidth). On the other hand, since TDD has a higher frequency band, the area in which the signal can reach is narrow. Also, since the downlink and uplink in TDD are the same frequency, the uplink cannot generally be transmitted in slots assigned to the downlink. Taking these characteristics into consideration, the scheduling of UL switching between TDD and FDD is determined.

[0043] <ULスイッチング> Next, UL switching will be explained.

[0044] UL switching (Uplink Tx Switching) is a mechanism to increase the uplink data rate by switching the slots for uplink transmission between PCell and SCell, or between NUL and SUL. UL switching includes, for example, carrier aggregation (CA)-based UL switching and SUL-based UL switching.

[0045] 1. CA-based UL switching (NUL+NUL) "CA-based UL switching" is a function that increases uplink throughput by switching the UL carrier of an NR wireless communication system that supports inter-band 2CA on a slot-by-slot basis in non-standalone (NSA) or stand-alone (SA) modes. In other words, this type of UL switching switches the cell in use on a slot-by-slot basis.

[0046] Fig. 3 is a diagram for explaining UL switching for switching a cell in use on a slot-by-slot basis, and Fig. 4 is a diagram showing an example of allocation to each slot in the uplink or downlink link direction in the UL switching shown in Fig. 3. In Fig. 4, "D" indicates that a slot is allocated to a DL signal, "U" indicates that a slot is allocated to a UL signal, and "S" indicates that a slot is allocated to a special link signal. As shown in Figs. 3 and 4, for example, in an area where both a PCC of a primary cell (PCell) of FDD and a SCC of a secondary cell (SCell) of TDD can be used, a mobile terminal 2 supporting inter-band 2CA can output a UL slot of TDD to the uplink in 2x2 MIMO, thereby improving the uplink capacity (data rate, throughput, etc.) and latency.

[0047] 2. SUL-based UL switching (NUL+SUL) "SUL-based UL switching" is a feature that increases uplink throughput by switching UL slots between SUL and TDD NUL on a slot-by-slot basis in non-standalone (NSA) and standalone (SA) modes. In other words, this type of UL switching switches frequency bands on a slot-by-slot basis.

[0048] Fig. 5 is a diagram for explaining UL switching for switching frequency bands on a slot-by-slot basis in the same cell, and Fig. 6 is a diagram showing an example of allocation to each slot in the uplink or downlink direction in the UL switching shown in Fig. 5. As shown in Figs. 5 and 6, when SUL is available, it is possible to improve uplink capacity and latency by using SUL in slots to which TDD UL slots are not assigned.

[0049] Regarding UL switching, for example, 3GPP TS38.214 6.1.6 describes the overview of the function, and TS38.521-1 6.3A.3 specifies the method of time mask measurement. Time mask measurement is a measurement or test to check whether a signal conforming to the above standard is output from mobile terminal 2 during UL switching.

[0050] Fig. 7 shows the time position of switching period Ts in carrier switching, where Fig. 7(a) shows a case where UL switching is performed within the range of carrier 1, and Fig. 7(b) shows a case where UL switching is performed within the range of carrier 2. Specifically, it is possible to specify the carrier where UL switching is performed and the switching period by an RRC message.

[0051] In 5G NR, one radio frame (10 ms) consists of 10 subframes (1 ms), one subframe consists of one or more slots, and one slot consists of 14 OFDM (Orthogonal Frequency Division Multiplexing) symbols.

[0052] <Scheduling information> Fig. 8 is a diagram showing an example of scheduling information in UL switching in which a cell to be used is switched on a slot-by-slot basis. When a test parameter indicating whether or not a test of the UL switching function is performed is set to ON, the scheduling information setting unit 12b generates or sets the scheduling information shown in Fig. 8 (when the switching period is 140 μs).

[0053] The scheduling information includes the items "Subframe No.", "Slot No.", "Slot Type", "UL DCI", "K2", "UL Type", "UL S" and "UL L" for the primary cell of FDD, and includes the items "Slot Type", "UL DCI", "K2", "UL Type", "UL S" and "UL L" for the secondary cell of TDD.

[0054] "Subframe No." indicates the subframe number. "Slot No." indicates the slot number. "Slot Type" indicates whether the slot is assigned to a UL signal, a DL signal, or a special link signal. Specifically, "U" in "Slot Type" indicates that the slot is assigned to a UL signal, "D" indicates that the slot is assigned to a DL signal, and "S" indicates that the slot is assigned to a special link signal.

[0055] "UL DCI" indicates whether or not scheduling information for PUCCH (Physical Uplink Control Channel) is enabled. When PUSCH scheduling information is enabled, "ON" is displayed in "UL DCI". "K2" indicates the transmission timing of PUSCH. "UL Type" indicates the mapping type of DMRS (Demodulation Reference Signal) of the UL signal defined by 3GPP. "UL S" indicates the start symbol of the UL signal slot. "UL L" indicates the symbol length of the UL signal slot.

[0056] Fig. 9 is a diagram showing an example of scheduling information in UL switching in which frequency bands are switched on a slot-by-slot basis. When a test parameter indicating whether or not a test of the UL switching function is performed is set to ON, the scheduling information setting unit 12b sets the scheduling information as shown in Fig. 9 (when the switching period is 140 μs).

[0057] The scheduling information includes the items "Slot No.", "Slot Type", "UL DCI", "K2", "UL Type", "UL S" and "UL L" for the NUL of TDD, and includes the items "Slot No.", "Slot Type", "UL DCI", "K2" and "UL Type" for the SUL. The meaning of each item is as described above.

[0058] <Mobile terminal test method> Next, a mobile terminal test method will be described with reference to the drawings.

[0059] 13 is a flowchart showing the procedure of the mobile terminal test method. First, the user operates the operation unit 17 to input test parameters (step S1). The test parameters are parameters indicating information necessary for performing a test, and examples of such test parameters include test parameters indicating whether or not a UL switching function test is performed, whether or not a CA-based UL switching function test is performed, whether or not a SUL-based UL switching function test is performed, a switching period, and a carrier or slot in which a switching period exists. The operation unit 17 sends the input test parameters to the test control unit 11. The test control unit 11 sends the test parameters to the setting unit 12 and stores them in the memory unit 19.

[0060] Next, the scenario information setting unit 12a of the setting unit 12 generates or sets scenario information based on the test parameters. The scenario information setting unit 12a sends the generated scenario information to the test control unit 11. The test control unit 11 sends the scenario information to the scenario information storage unit 19a to store it.

[0061] Furthermore, the scheduling information setting unit 12b of the setting unit 12 generates or sets scheduling information based on the test parameters (step S2). The scheduling information setting unit 12b sends the generated scheduling information to the test control unit 11. The test control unit 11 sends the scheduling information to the base station control unit 13, the first RF measurement unit 14, and the second RF measurement unit 15, and, if necessary, sends it to the scheduling information storage unit 19b for storage.

[0062] The base station control unit 13 controls the pseudo base station unit 16 based on the scenario information to establish a call connection with the mobile terminal 2 (step S3).

[0063] Next, the base station control unit 13 generates or acquires an RRC message and DCI based on necessary information such as test parameters, scenario information, and scheduling information, and transmits them from the pseudo base station unit 16 to the mobile terminal 2. The RRC message can include information specifying the carrier on which UL switching is performed and the switching period. The DCI is control information transmitted in the downlink (DL), and includes information for scheduling the DL / UL slot allocation. The pseudo base station unit 16 schedules the DL / UL slot allocation in the mobile terminal 2 by sending the DCI to the mobile terminal 2 (step S4).

[0064] Next, the pseudo base station unit 16 receives a UL signal from the mobile terminal 2. The UL signal is configured, for example, by switching between a first UL signal transmitted using a first carrier (PCC of a primary cell in FDD) and a second UL signal transmitted using a second carrier (SCC of a secondary cell in TDD) on a slot-by-slot basis. Alternatively, the UL signal is configured, for example, by switching between a first UL signal transmitted using a first carrier (NUL in TDD) and a second UL signal transmitted using a second carrier (SUL) on a slot-by-slot basis.

[0065] Next, the first RF measurement unit 14 measures the first UL signal transmitted using the first carrier based on the scheduling information (step S5). At the same time, or in parallel, the second RF measurement unit 15 measures the second UL signal transmitted using the second carrier based on the scheduling information (step S6).

[0066] Specifically, for example, when testing a CA-based UL switching function, the first RF measurement unit 14 measures a signal on the PCC side, and the second RF measurement unit 15 measures a signal on the SCC side. Also, when testing a SUL-based UL switching function, the first RF measurement unit 14 measures a signal on the NUL side, and the second RF measurement unit 15 measures a signal on the SUL side.

[0067] Fig. 10 is a diagram showing a signal path from a mobile terminal 2 to a mobile terminal test device 1 in a test of a CA-based UL switching function. As shown in Fig. 10(a), as an UL signal of a primary cell of FDD, a 2.1 GHz band signal (signal on the PCC side) from a transmitter TX1 of the mobile terminal 2 is input to a module 1a of the mobile terminal test device 1 via a combiner 20 (2.1 GHz band SISO). Also, as shown in Fig. 10(b), as an UL signal of a secondary cell of TDD, a 3.5 GHz band signal (signal on the SCC side) from a transmitter TX1 of the mobile terminal 2 is input to a module 1b of the mobile terminal test device 1 via a combiner 20, and a 3.5 GHz band signal from a transmitter TX2 of the mobile terminal 2 is input to a module 1b of the mobile terminal test device 1 (3.5 GHz band MIMO).

[0068] Fig. 11 shows a signal path from the mobile terminal 2 to the mobile terminal test equipment 1 in SUL-based UL switching. As shown in Fig. 11(a), the NUL signal is input from the transmitter TX1 of the mobile terminal 2 to the module 1a of the mobile terminal test equipment 1 via the combiner 20, and is also input from the transmitter TX2 of the mobile terminal 2 to the module 1a (2x2MIMO). As shown in Fig. 11(b), the SUL signal is input from the transmitter TX1 of the mobile terminal 2 to the module 1b of the mobile terminal test equipment 1 via the combiner 20 (SISO). Note that the combiner 20 may be provided in the mobile terminal test equipment 1.

[0069] Next, the display unit 18 displays on the same time axis the time waveform obtained by the measurement of the first UL signal by the first RF measurement unit 14 and the time waveform obtained by the measurement of the second UL signal by the second RF measurement unit 15 (step S7). Specifically, for example, when the CA-based UL switching function is being tested, the display unit 18 displays on the same time axis the time waveform of the signal on the PCC side and the time waveform of the signal on the SCC side. Also, when the SUL-based UL switching function is being tested, the display unit 18 displays on the same time axis the time waveform of the signal on the NUL side and the time waveform of the signal on the SUL side. Also, in addition to these time waveforms, the display unit 18 further displays the slot range on the same time axis.

[0070] Fig. 12 is a diagram showing an example of a display image on the display unit 18 of the mobile terminal test equipment 1. Fig. 12 shows the measured PCC waveform and SCC waveform on the same time axis in a test of the CA-based UL switching function. The slot range is also shown on the same time axis. In Fig. 12, the ranges of slot 3 and slot 4 are shown. From Fig. 12, it is possible to confirm a switching period in which no UL signal is present in the switching region between the PCC waveform and the SCC waveform. It is also apparent that the switching period exists within slot 3.

[0071] The test control unit 11 may display various measurement results other than the time waveform on the display unit 18, or may evaluate the measurement results and display the evaluation results on the display unit 18. The mobile terminal test device 1 can selectively perform, for example, throughput measurement, Tx measurement, and time mask measurement. In uplink throughput measurement, the total value of PCC and SCC, or NUL and SUL for two frames may be calculated.

[0072] <Actions and Effects> As described above, in the mobile terminal test equipment 1 of this embodiment, the scheduling information setting unit 12b sets scheduling information that specifies either the first carrier or the second carrier used for the uplink from the mobile terminal 2 to the base station for each slot of the UL signal, the first RF measurement unit 14 measures the first UL signal transmitted from the mobile terminal 2 to the pseudo base station unit 16 using the first carrier based on the scheduling information, and the second RF measurement unit 15 measures the second UL signal transmitted from the mobile terminal 2 to the pseudo base station unit 16 using the second carrier based on the scheduling information.

[0073] With this configuration, the mobile terminal test device 1 of this embodiment can set scheduling information suitable for the test even in a case where the UL carrier changes on a slot-by-slot basis, such as in UL switching, by the scheduling information setting unit 12b. Also, since the mobile terminal test device 1 is provided with a first RF measurement unit 14 corresponding to the first carrier and a second RF measurement unit 15 corresponding to the second carrier separately, and can measure the first UL signal and the second UL signal simultaneously or in parallel based on the scheduling information suitable for the test, it can also perform a test (for example, a time mask measurement) in a case where the UL carrier changes on a slot-by-slot basis, such as in UL switching.

[0074] In addition, in the mobile terminal test device 1 of this embodiment, the first carrier is a carrier of a primary cell (PCell) of FDD, and the second carrier is a carrier of a secondary cell (SCell) of TDD. This configuration makes it possible to test cases in which the cell that transmits the UL signal changes on a slot-by-slot basis, such as CA-based UL switching. For example, in an area where both the PCC of the primary cell (PCell) of FDD and the SCC of the secondary cell (SCell) of TDD can be used, the UL switching function of the mobile terminal 2 that supports inter-band 2CA to switch the UL carrier between the PCC and the SCC can be tested.

[0075] In the mobile terminal test device 1 of this embodiment, the first carrier is a TDD NUL carrier, and the second carrier is a SUL carrier of the same cell as the NUL. This configuration makes it possible to test cases where the frequency band for transmitting a UL signal changes on a slot-by-slot basis, such as UL switching. For example, it is possible to test the UL switching function that improves uplink capacity and latency by switching the UL carrier between SUL and NUL so as to use the SUL in a slot to which the TDD NUL slot is not assigned.

[0076] Moreover, the mobile terminal test equipment 1 of this embodiment includes a display unit 18 that displays the time waveform of the first UL signal measured by the first RF measurement unit 14 and the time waveform of the second UL signal measured by the second RF measurement unit 15 on the same time axis. With this configuration, it is possible to easily check the switching period required for switching between the first UL signal and the second UL signal. This makes it possible to easily perform time mask measurement even in testing the UL switching function.

[0077] In addition, in the mobile terminal test device 1 of this embodiment, the scheduling information setting unit 12b can set the scheduling information so that the switching between the first carrier and the second carrier in the uplink is performed within the slot of either the first carrier or the second carrier. Furthermore, the display unit 18 is configured to further display the range of the slot in which the switching is performed on the same time axis. With this configuration, it is possible to easily determine whether the slot or carrier in which the UL switching is performed is appropriate.

[0078] In the above description, an embodiment of the present invention has been described using as an example a mobile terminal test device and a mobile terminal test method for testing a mobile terminal compliant with the 5G NR standard, but the applicable standard is not limited to 5G NR and may be another standard. [Industrial Applicability]

[0079] As described above, the present invention has the effect of being able to test cases in which the UL carrier changes, such as cells or frequency bands that transmit UL signals on a slot-by-slot basis, as in UL switching, and is useful for mobile terminal test apparatuses and mobile terminal test methods as a whole. [Explanation of symbols]

[0080] 1 Mobile terminal test equipment 2 Mobile terminals 10 Processing section 11 Test control section 12 Setting section 12a Scenario information setting section 12b Scheduling information setting section 13 Base station control unit (control unit) 14 First RF measurement unit (first measurement unit) 15 Second RF measurement unit (second measurement unit) 16 Pseudo base station section 17 Control section 18 Display 19 Memory section 19a Scenario information storage section 19b Scheduling information storage unit 20 Combiner

Claims

1. A mobile terminal test device (1) for testing a mobile terminal (2), comprising: A pseudo base station unit (16) that simulates a base station that communicates with the mobile terminal; A setting unit (12) that sets scheduling information that designates one of a first carrier and a second carrier used for an uplink from the mobile terminal to the base station for each slot of the uplink; A control unit (13) that controls the pseudo base station unit based on the scheduling information; a first measurement unit (14) that measures a first uplink signal transmitted from the mobile terminal to the pseudo base station unit using the first carrier based on the scheduling information; a second measurement unit (15) that measures a second uplink signal transmitted from the mobile terminal to the pseudo base station unit using the second carrier based on the scheduling information; A mobile terminal test device comprising:

2. 2. The mobile terminal test device according to claim 1, wherein the first carrier is a carrier of a first cell in frequency division duplex (FDD), and the second carrier is a carrier of a second cell in time division duplex (TDD).

3. 2. The mobile terminal test device according to claim 1, wherein the first carrier is a carrier in a first frequency band of time division duplex (TDD), and the second carrier is a carrier in a second frequency band of the same cell as the first frequency band.

4. 2. The mobile terminal test device according to claim 1, further comprising a display unit (18) that displays a time waveform of the first uplink signal measured by the first measurement unit and a time waveform of the second uplink signal measured by the second measurement unit on the same time axis.

5. 5. The mobile terminal test device according to claim 4, wherein the setting unit sets the scheduling information so that switching between the first carrier and the second carrier in the uplink is performed within a slot of either the first carrier or the second carrier, and the display unit further displays on the same time axis the range of the slots in which the switching is performed.

6. A mobile terminal test device (1) comprising a pseudo base station unit (16) for simulating a base station that communicates with a mobile terminal (2), and for testing the mobile terminal, Setting scheduling information that designates one of a first carrier and a second carrier used for an uplink from the mobile terminal to the base station for each slot of the uplink; Controlling the pseudo base station unit based on the scheduling information; measuring a first uplink signal transmitted from the mobile terminal to the pseudo base station unit using the first carrier based on the scheduling information; A second uplink signal transmitted from the mobile terminal to the pseudo base station unit using the second carrier is measured based on the scheduling information. A mobile terminal testing method comprising:

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