Multi-frequency complex mode terminal signal test method, system and equipment

Abstract

The invention relates to the technical field of radio frequency function performance testing, and discloses a multi-frequency complex mode terminal signal testing method, system and device. The terminal signal test method is applied to the electronic signal test equipment, and specifically comprises the following steps: S101, receiving a signal test instruction sent by a terminal, generating signal configuration information, sending the signal configuration information to a configuration comprehensive tester, enabling the configuration comprehensive tester to generate 2G and 3G signals, radiating a dual-frequency signal through a darkroom coupling antenna, and executing network search by the terminal, the spectrum analyzer synchronously captures signal frequency domain characteristics, and verifies whether the terminal firstly locks the GSM time slot frame when the call instruction is triggered. According to the method, switching of signals in various signal cells and signal transformation are effectively detected, the types of the signals are tested under the laboratory condition, the priority capability of various signals for weakening and signal selection by a terminal under the real condition is tested, and whether communication and accurate satellite positioning can be carried out at the same time or not is verified.

Description

Technical Field

[0001] The present invention relates to the technical field of radio frequency function performance testing, and in particular to a method, system and device for testing multi-frequency complex mode terminal signals. Background Art

[0002] Mobile communication signals have completely covered the current communication network technology. The signals are composed of 2G (GSM), 3G (WCDMA), 4G (LTE), and 5G (NR) communication networks, and the technologies therein improve the transmission rate and increase the communication bandwidth.

[0003] However, in actual applications, the signal transmission capacity of the above frequency bands has decreased because there are problems with signal network coverage in actual applications. The terminal signal access and the actual switching and reorganization priority selection are insufficient, resulting in frequent signal terminal connections and inability to communicate normally. Therefore, there has been a new improvement in the selection of high-communication network priority combination communications in existing terminal technology. Summary of the Invention

[0004] The purpose of the present invention is to provide a multi-frequency complex mode terminal signal testing method, system and equipment, which can test the signal category under laboratory conditions, as well as the various signals that become strong or weak under real conditions, the terminal's priority ability to select signals, and verify whether communication and accurate satellite positioning can be carried out simultaneously, aiming to solve the problems in the existing technology.

[0005] The present invention is implemented as follows: a multi-frequency complex pattern terminal signal testing method is applied to electronic signal testing equipment, specifically comprising the following steps:

[0006] S101: Receive a signal test command sent by the terminal, generate signal configuration information, and send it to a configuration integrated tester. The configuration integrated tester generates 2G and 3G signals, radiates dual-frequency signals through a darkroom coupling antenna, and the terminal performs a network search. The spectrum analyzer synchronously captures the signal frequency domain characteristics to verify whether the terminal first locks onto the GSM time slot frame when a call command is triggered, and whether the terminal first establishes a WCDMA dedicated channel when a data service is requested, thereby completing multi-band coexistence and network priority testing.

[0007] S102: After confirming that the GSM time slot frame is locked and the WCDMA dedicated channel is established, the 4G integrated tester and the 5G integrated tester are connected in parallel to the dual-frequency signal radiated by the coupled antenna in the darkroom. The terminal first establishes a 4G connection and then activates the 5G non-standalone network. The spectrum analyzer is used to monitor the changes in the dual-link signal strength in real time. While gradually reducing the minimum input level of the 4G signal source output power, the 5G signal receiving power reported by the terminal is verified. The 4G and 5G signal sources are synchronously turned off. The spectrum analyzer records the attenuation characteristics of the signal strength of all frequency bands down to the noise floor within a preset time, completing the 4G / 5G non-standalone network interoperability test;

[0008] S103: Start the 5G integrated tester separately and configure it in SA mode. Output the n41 frequency band signal. After the terminal first connects to the 5G network, immediately turn off the 5G signal source and simultaneously activate the 4G signal source to verify whether the terminal switches to the 4G network within the preset time after the 5G signal is lost. Then, re-enable the 5G signal source to verify whether the terminal switches back to the 5G network within the preset time. Finally, turn off the 4G signal source separately and use the spectrum analyzer to continuously monitor the 5G frequency band to confirm that the terminal maintains a 5G connection and the signal strength fluctuation range is within the range. Confirm that the spectrum graph shows the n41 single carrier characteristics. The 5G independent network switching test is completed.

[0009] S104: Synchronously start four independent signal sources: 2G, 3G, 4G, and 5G. The terminal verifies the dynamic network selection strategy. When a call service is initiated, the terminal is forced to first connect to the 2G network. After the 2G signal is interrupted, the order in which the terminal attempts to connect to the 5G, 4G, and 3G networks and the switching delay are recorded, completing the multi-standard dynamic priority coordination test of the call service.

[0010] S105: When a data service is initiated, the terminal is forced to prioritize access to the 5G network. After the 5G signal is interrupted, it is verified that it switches to 4G → 3G → 2G in descending order. During the test, the spectrum analyzer is used to capture the occupancy status of each frequency band in real time to confirm whether only one standard is in an active connection state at any time, completing the multi-standard dynamic priority coordination test of data services.

[0011] Furthermore, in S101, a signal test instruction sent by a terminal is received, and signal configuration information is generated and sent to a configuration integrated tester, so that the configuration integrated tester generates 2G and 3G signals, including:

[0012] The center frequency of the 2G signal configured by the comprehensive tester is 900 MHz, the center frequency of the 3G signal is 2100 MHz, and the signal strength is set to -85 dBm.

[0013] Furthermore, in S102, the 4G integrated tester and the 5G integrated tester are connected in parallel to the dual-frequency signal radiated by the coupled antenna in the darkroom. The terminal first establishes a 4G connection and then activates the 5G non-standalone network, including:

[0014] In 5G NSA mode, the 4G base station is configured as the anchor point and the 5G base station as the auxiliary node. After the terminal initially attaches to the 4G network, the establishment of a 5G dual connection is triggered through interface signaling.

[0015] The spectrum analyzer must simultaneously display the spectrum waveforms of the 4G primary carrier and the 5G secondary carrier. When the 4G signal strength decreases linearly from -85dBm to -110dBm, the 5G RSRP reported by the terminal increases from -90dBm to -65dBm, and the signal-to-interference-plus-noise ratio remains above 15dB.

[0016] During the dual-link disconnection phase, the terminal should send SCG Failure signaling and observe on the spectrum analyzer that the number of 5GPRACH preamble retransmissions does not exceed 3 times.

[0017] Furthermore, in S103, after the terminal first accesses the 5G network, the 5G signal source is immediately turned off and the 4G signal source is synchronously activated to verify whether the terminal switches to the 4G network within the preset time after the 5G signal is lost, including:

[0018] The 5G SA network is configured in TDD mode with a subcarrier spacing of 30kHz and an SSB period of 20ms. The 4G network is configured in FDD mode with a bandwidth of 10MHz.

[0019] When a terminal is connected to 5G and performing a VoNR voice call, if the 5G signal suddenly drops by 20dB, the terminal triggers the 5G source shutdown command to start the EPS Fallback process, and falls back to 4G VoLTE through the N26 interface. The voice interruption time during the handover process is ≤300ms.

[0020] After reactivating the 5G signal, the terminal triggers a return operation based on the measurement event that the quality of the neighboring cell of the different system is higher than the threshold. The spectrum analyzer needs to capture the spectrum characteristics of the message sent by the terminal in the 2.5GHz frequency band.

[0021] Furthermore, in S104, the order in which the terminal attempts to connect to the 5G, 4G, and 3G networks and the switching delay are recorded, completing the multi-standard dynamic priority coordination test of the call service, including:

[0022] Differentiated cell parameters are configured for each standard. The differentiated cell parameters are: LAC = 1001 for 2G cells, SID = 2001 for 3G cells, TAC = 3001 for 4G cells, and TAC = 4001 for 5G cells. When the terminal is in idle state, a dedicated test command is used to forcibly clear the network preference list.

[0023] During call service testing, the initial 2G signal strength is set to -75dBm, and the other standards are all -85dBm. After the terminal initiates a call, it needs to parse the Um interface signaling to confirm that it first sends a CM Service Request to the 2GMSC.

[0024] Furthermore, in S105, the test uses a spectrum analyzer to capture the occupancy status of each frequency band in real time to confirm whether only one standard is in an active connection state at any time, completing the data service multi-standard dynamic priority coordination test, including:

[0025] During data service testing, the 5G signal strength is set to -70dBm, and the other standards are all -95dBm. The terminal should initiate a PDU session establishment request to the 5G AMF.

[0026] When data services are interrupted, the 5G signal is turned off and the terminal is redirected to 4G based on the communication network instructions. When the 4GSINR is less than 0dB, the CDMA2000 1xEV-DO connection is started, and finally the connection is dropped to the GPRS network when the wireless environment deteriorates.

[0027] Each handover requires capturing the RACH access burst signal of the target frequency band through a spectrum analyzer, and recording the time sequence from the source base station receiving the communication network to the target base station completing the RRC Setup.

[0028] Furthermore, based on the call service or data service signal, the GPS / Beidou satellite signal source is added, including:

[0029] The terminal starts the satellite positioning software while performing calls or data services;

[0030] Use a spectrum analyzer to scan the 1164-1610 MHz frequency band to confirm that there is no frequency overlap between the satellite signal and the cellular signal and that the control isolation is greater than 60 dB;

[0031] The number of visible satellites and longitude and latitude coordinates in the terminal positioning information were read, and finally the satellite signal strength was gradually reduced from -130dBm to -155dBm to verify that the terminal lost its positioning capability when the signal strength was below -148dBm.

[0032] Furthermore, confirm that there is no frequency overlap between satellite and cellular signals and that the isolation is greater than 60dB, including:

[0033] The satellite signal source outputs right-hand circularly polarized waves, which are radiated by the spiral antenna on the top of the conical anechoic chamber. The cellular signal source outputs vertically polarized waves, which are radiated by the log-periodic antenna on the side wall.

[0034] The spectrum analyzer uses a directional coupler to separate the two signals. The satellite signal power spectral density at 1575 MHz must be 15 dB above the noise floor, while the cellular band spurious emissions at this frequency must be below -110 dBm / MHz.

[0035] When the terminal initiates uplink transmission, the spectrum analyzer scans the 1575MHz frequency band and no burst pulses appear, confirming that there is no frequency rebound interference.

[0036] Compared with the prior art, the multi-frequency complex mode terminal signal testing method, system and device provided by the present invention have the following beneficial effects:

[0037] 1. Effectively detect signal switching in multiple signal cells, signal transformation, test the signal category under laboratory conditions, and the strong to weak signals under real conditions, the terminal's ability to prioritize signal selection, and verify whether communication and accurate satellite positioning can be carried out simultaneously.

[0038] 2. By building an integrated test environment for full-band parallel signal generation and high-precision spectrum analysis, it supports simultaneous radiation of six signals from 2G to 5G and satellite bands. The central control unit dynamically loads a priority policy library based on service type, forcing voice services to trigger CM Service Request signaling to connect directly to the 2G network and data services to directly connect to the 5G PDU session, achieving intelligent network selection and matching. The spectrum analysis unit performs three-order parallel operations with a 256MHz real-time bandwidth: full-band scanning to capture transient interference, demodulation layer 1 signaling to verify 80ms-level MR event response, and dynamic monitoring of satellite frequency band isolation greater than 60dB, achieving multi-frequency mutual interference positioning accuracy of 0.1ppm. A programmable robotic arm simulates 360° terminal rotation conditions. Combined with the baseband chip's real-time RSSI / SINR / BER logs, it completes full-scenario verification of NSA / SA networking switching, multi-standard priority coordination, and satellite joint positioning in a single test, improving test efficiency compared to traditional serial solutions.

[0039] 3. The polarization-isolated chamber architecture and dynamic policy engine provide closed-loop support for optimizing terminal RF performance. Cellular signals are radiated with vertical linear polarization using a wall-mounted log-periodic antenna, while satellite signals are transmitted with right-hand circular polarization via a top-mounted spiral antenna. Physical-layer isolation exceeds the 60dB limit, enabling satellite positioning to maintain a 35dB-Hz carrier-to-noise ratio at a critical sensitivity of -148dBm. The built-in priority policy library in the central control unit can be updated online and is compatible with network configuration templates from over 200 global operators. The latency of forced 2G fallback for voice calls in concurrent services is compressed to 150ms, and the reconnection speed for 5G data services reaches 3 seconds. This supports 99.999% reliability verification for URLLC scenarios in the 3GPP R16 protocol, promotes the standardization of 5G+Beidou multi-frequency converged terminals, and achieves mutual recognition of test data in smart cities, industrial Internet, and other fields.

[0040] A multi-frequency complex mode terminal signal testing system is used to perform the above-mentioned terminal signal testing method, and the terminal signal testing system includes:

[0041] The multi-band signal generation unit includes 2G signal sources, 3G signal sources, 4G signal sources, 5G signal sources, and satellite signal sources connected in parallel. The output power dynamic range of each signal source covers -155dBm to +30dBm, and is connected to the darkroom antenna system through an RF combiner.

[0042] The central control unit is used to run the automated test software, synchronously control the start and stop of the signal source, power adjustment, and system switching through the GPIB / LAN bus, and configure a dynamic priority policy library to force 2G priority access for voice services and 5G priority access for data services;

[0043] Spectrum analysis unit, used for vector signal analyzers with real-time bandwidth ≥ 256MHz. The input port is connected to the anechoic chamber antenna via a directional coupler and performs third-order operations in real time:

[0044] Scan the entire 800MHz-6GHz frequency band to capture the spectrum of multiple signals coexisting;

[0045] Demodulate GSM / WCDMA / LTE / NR signals to verify the delay of MR event triggering;

[0046] The isolation between the monitoring satellite frequency band and the cellular frequency band is greater than 60dB;

[0047] The terminal interaction verification unit completes information interaction with the terminal and includes: a programmable robotic arm for fixing the terminal at the center of the darkroom and enabling 0-360° rotation; a data acquisition interface for real-time acquisition of RSSI / SINR / BER logs of the terminal baseband chip; and a service simulation module for generating VoLTE / VoNR voice calls and FTP / UDP data streams.

[0048] The darkroom environment unit is used to generate corresponding application environment scenarios and is implemented through practical internal integration.

[0049] A multi-frequency complex pattern terminal signal testing device includes a storage device and a processor, wherein the storage device is used to store a computer program, and the processor runs the computer program to enable the multi-frequency complex pattern terminal signal testing device to perform the multi-frequency complex pattern terminal signal testing method described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 This is a schematic flow chart of the multi-frequency complex mode terminal signal testing method proposed by the present invention;

[0051] Figure 2 This is a schematic diagram of the process of connecting a 4G integrated tester and a 5G integrated tester in parallel to the dual-frequency signal radiated by the coupled antenna in the darkroom in the multi-frequency complex mode terminal signal testing method proposed by the present invention. The terminal first establishes a 4G connection and then activates the 5G non-standalone network.

[0052] Figure 3 This is a schematic diagram of the structure of the multi-frequency complex mode terminal signal testing system proposed by the present invention;

[0053] Figure 4 This is the operation logic diagram of the multi-frequency complex mode terminal signal test system proposed by the present invention;

[0054] Figure 5 This is a structural diagram of the multi-frequency complex mode terminal signal testing equipment proposed by the present invention. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0056] The implementation of the present invention is described in detail below with reference to specific embodiments.

[0057] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "up", "down", "left", "right", etc. indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0058] Reference Figure 1-2 As shown, the multi-frequency complex pattern terminal signal testing method is applied to electronic signal testing equipment and specifically includes the following steps:

[0059] S101: Receive a signal test command sent by the terminal, generate signal configuration information, and send it to a configuration integrated tester. The configuration integrated tester generates 2G and 3G signals, radiates dual-frequency signals through a darkroom coupling antenna, and the terminal performs a network search. The spectrum analyzer synchronously captures the signal frequency domain characteristics to verify whether the terminal first locks onto the GSM time slot frame when a call command is triggered, and whether the terminal first establishes a WCDMA dedicated channel when a data service is requested, thereby completing multi-band coexistence and network priority testing.

[0060] The signal test instruction sent by the receiving terminal is received, and signal configuration information is generated and sent to the configuration comprehensive tester, so that the configuration comprehensive tester generates 2G and 3G signals, including:

[0061] The integrated tester is configured with a 2G signal center frequency of 900 MHz and a 3G signal center frequency of 2100 MHz, and the signal strength is set to -85 dBm.

[0062] S102: After confirming that the GSM time slot frame is locked and the WCDMA dedicated channel is established, the 4G integrated tester and the 5G integrated tester are connected in parallel to the dual-frequency signal radiated by the coupled antenna in the darkroom. The terminal first establishes a 4G connection and then activates the 5G non-standalone network. The spectrum analyzer is used to monitor the changes in the dual-link signal strength in real time. While gradually reducing the minimum input level of the 4G signal source output power, the 5G signal receiving power reported by the terminal is verified. The 4G and 5G signal sources are synchronously turned off. The spectrum analyzer records the attenuation characteristics of the signal strength of all frequency bands down to the noise floor within a preset time, completing the 4G / 5G non-standalone network interoperability test;

[0063] The 4G and 5G integrated testers are connected in parallel to the dual-frequency signal radiated by the coupled antenna in the darkroom. The terminal first establishes a 4G connection and then activates the 5G non-standalone network, including:

[0064] In 5G NSA mode, the 4G base station is configured as the anchor point and the 5G base station as the auxiliary node. After the terminal initially attaches to the 4G network, the establishment of a 5G dual connection is triggered through interface signaling.

[0065] The spectrum analyzer must simultaneously display the spectrum waveforms of the 4G primary carrier and the 5G secondary carrier. When the 4G signal strength decreases linearly from -85dBm to -110dBm, the 5G RSRP reported by the terminal increases from -90dBm to -65dBm, and the signal-to-interference-plus-noise ratio remains above 15dB.

[0066] During the dual-link disconnection phase, the terminal should send SCG Failure signaling and observe that the number of 5GPRACH preamble retransmissions does not exceed 3 times on the spectrum analyzer;

[0067] S103: Start the 5G integrated tester separately and configure it in SA mode. Output the n41 frequency band signal. After the terminal first connects to the 5G network, immediately turn off the 5G signal source and simultaneously activate the 4G signal source to verify whether the terminal switches to the 4G network within the preset time after the 5G signal is lost. Then, re-enable the 5G signal source to verify whether the terminal switches back to the 5G network within the preset time. Finally, turn off the 4G signal source separately and use the spectrum analyzer to continuously monitor the 5G frequency band to confirm that the terminal maintains a 5G connection and the signal strength fluctuation range is within the range. Confirm that the spectrum graph shows the n41 single carrier characteristics. The 5G independent network switching test is completed.

[0068] Among them, after the terminal first connects to the 5G network, it immediately turns off the 5G signal source and simultaneously activates the 4G signal source to verify whether the terminal switches to the 4G network within the preset time after the 5G signal is lost, including:

[0069] The 5G SA network is configured in TDD mode with a subcarrier spacing of 30kHz and an SSB period of 20ms. The 4G network is configured in FDD mode with a bandwidth of 10MHz.

[0070] When a terminal is connected to 5G and performing a VoNR voice call, if the 5G signal suddenly drops by 20dB, the terminal triggers the 5G source shutdown command to start the EPS Fallback process, and falls back to 4G VoLTE through the N26 interface. The voice interruption time during the handover process is ≤300ms.

[0071] After reactivating the 5G signal, the terminal triggers a return operation based on the measurement event that the quality of the neighboring cell of the different system exceeds the threshold. The spectrum analyzer needs to capture the spectrum characteristics of the terminal's sent message in the 2.5 GHz frequency band.

[0072] S104: Synchronously start four independent signal sources: 2G, 3G, 4G, and 5G. The terminal verifies the dynamic network selection strategy. When a call service is initiated, the terminal is forced to first connect to the 2G network. After the 2G signal is interrupted, the order in which the terminal attempts to connect to the 5G, 4G, and 3G networks and the switching delay are recorded, completing the multi-standard dynamic priority coordination test of the call service.

[0073] S105: When a data service is initiated, the terminal is forced to prioritize access to the 5G network. After the 5G signal is interrupted, it is verified that it switches to 4G → 3G → 2G in descending order. During the test, the spectrum analyzer is used to capture the occupancy status of each frequency band in real time to confirm whether only one standard is in an active connection state at any time. The multi-standard dynamic priority coordination test of the data service is completed, and the signal switching and signal transformation in multiple signal cells are effectively detected. The signal category is tested under laboratory conditions, and the various signals become strong and weak under real conditions. The terminal's ability to prioritize signals is verified to verify whether communication and accurate satellite positioning can be carried out simultaneously.

[0074] In S104 of this embodiment, the order in which the terminal attempts to connect to the 5G, 4G, and 3G networks and the handover delay are recorded to complete the multi-standard dynamic priority coordination test of the call service, including:

[0075] Differentiated cell parameters are configured for each standard. The differentiated cell parameters are as follows: LAC = 1001 for 2G cells, SID = 2001 for 3G cells, TAC = 3001 for 4G cells, and TAC = 4001 for 5G cells. When the terminal is in idle state, a dedicated test command is used to forcibly clear the network preference list.

[0076] During call service testing, the initial 2G signal strength is set to -75dBm, and the other standards are all -85dBm. After the terminal initiates a call, it needs to parse the Um interface signaling to confirm that it first sends a CM Service Request to the 2GMSC.

[0077] In S105 of this embodiment, the test uses a spectrum analyzer to capture the occupancy status of each frequency band in real time to confirm whether only one standard is in an active connection state at any time, thereby completing the multi-standard dynamic priority coordination test for data services, including:

[0078] During data service testing, the 5G signal strength is set to -70dBm, and the other standards are all -95dBm. The terminal should initiate a PDU session establishment request to the 5G AMF.

[0079] When data services are interrupted, the 5G signal is turned off and the terminal is redirected to 4G based on the communication network instructions. When the 4GSINR is less than 0dB, the CDMA2000 1xEV-DO connection is started, and finally the connection is dropped to the GPRS network when the wireless environment deteriorates.

[0080] Each handover requires capturing the RACH access burst signal of the target frequency band through a spectrum analyzer, and recording the time sequence from the source base station receiving the communication network to the target base station completing the RRC Setup. By building an integrated test environment for full-band parallel signal generation and high-precision spectrum analysis, it supports the simultaneous radiation of six signals from 2G to 5G and satellite bands. The central control unit dynamically loads the priority policy library based on the service type, forcing voice services to trigger CM Service Request signaling to directly connect to the 2G network and data services to directly connect to the 5G PDU session, realizing intelligent matching of network selection.

[0081] In this embodiment, a GPS / Beidou satellite signal source is added to the call service or data service signal, including:

[0082] The terminal starts the satellite positioning software while performing calls or data services;

[0083] Use a spectrum analyzer to scan the 1164-1610 MHz frequency band to confirm that there is no frequency overlap between the satellite signal and the cellular signal and that the control isolation is greater than 60 dB;

[0084] Confirming that there is no frequency overlap between satellite and cellular signals and that the isolation is greater than 60dB includes:

[0085] The satellite signal source outputs right-hand circularly polarized waves, which are radiated by the spiral antenna on the top of the conical anechoic chamber. The cellular signal source outputs vertically polarized waves, which are radiated by the log-periodic antenna on the side wall.

[0086] The spectrum analyzer uses a directional coupler to separate the two signals. The satellite signal power spectral density at 1575 MHz must be 15 dB above the noise floor, while the cellular band spurious emissions at this frequency must be below -110 dBm / MHz.

[0087] When the terminal initiates uplink transmission, the spectrum analyzer scans the 1575MHz frequency band and no burst pulses appear, confirming that there is no frequency rebound interference.

[0088] The system reads the number of visible satellites and longitude and latitude coordinates from the terminal's positioning information, then gradually reduces the satellite signal strength from -130dBm to -155dBm to verify that the terminal loses its positioning capability below -148dBm. The polarization-isolated chamber architecture and dynamic strategy engine provide closed-loop support for optimizing terminal RF performance. Cellular signals are radiated using vertical linear polarization via a wall-mounted log-periodic antenna, while satellite signals are transmitted using right-hand circular polarization via the top spiral antenna. Physical layer isolation exceeds the 60dB limit, enabling satellite positioning to maintain a 35dB-Hz carrier-to-noise ratio at a critical sensitivity of -148dBm.

[0089] Reference Figure 3As shown, a multi-frequency complex mode terminal signal test system is used to perform the above-mentioned terminal signal test method. The terminal signal test system includes: a multi-band signal generation unit, including a 2G signal source, a 3G signal source, a 4G signal source, a 5G signal source and a satellite signal source connected in parallel. The output power dynamic range of each signal source covers -155dBm to +30dBm, and is connected to the darkroom antenna system through an RF combiner; a central control unit is used to run the automated test software, synchronously control the start and stop, power adjustment and system switching of the signal source through the GPIB / LAN bus, and configure a dynamic priority policy library. Voice services are forced to have priority access to 2G and data services are forced to have priority access to 5G; a spectrum analysis unit is used for a vector signal analyzer with a real-time bandwidth ≥256MHz. The input port is connected to the darkroom antenna through a directional coupler, and the third-order operation is performed in real time:

[0090] Scan the entire 800MHz-6GHz frequency band to capture the spectrum of multiple signals coexisting;

[0091] Demodulate GSM / WCDMA / LTE / NR signals to verify the delay of MR event triggering;

[0092] The isolation between the monitoring satellite frequency band and the cellular frequency band is greater than 60dB;

[0093] The terminal interaction verification unit completes information interaction with the terminal and includes: a programmable robotic arm for fixing the terminal at the center of the darkroom and achieving 0°-360° rotation; a data acquisition interface for real-time acquisition of the RSSI / SINR / BER logs of the terminal baseband chip; a service simulation module for generating VoLTE / VoNR voice calls and FTP / UDP data streams; and a darkroom environment unit for generating corresponding application environment scenarios. Practical internal integration is implemented, and the built-in priority policy library of the central control unit can be updated online, adapting to the network configuration templates of more than 200 global operators. The terminal's voice call forced fallback to 2G in concurrent services is compressed to 150ms, and the 5G data service reconnection speed reaches 3 seconds. It supports 99.999% reliability verification of URLLC scenarios in the 3GPP R16 protocol, promotes the standardization of 5G+Beidou multi-frequency fusion terminals, and realizes mutual recognition of test data in smart cities, industrial Internet and other fields.

[0094] Reference Figure 4 As shown in the figure, the operation logic diagram of the multi-frequency complex mode terminal signal test system is as follows:

[0095] SS side: integrated tester, base station;

[0096] PC side: terminal;

[0097] SG end: signal source;

[0098] SA side: spectrum analyzer;

[0099] EUT end: equipment under test;

[0100] Among them, SS2G (2G integrated tester, base station), SS 3G (3G integrated tester, base station), SS 4G (4G integrated tester, base station), and SS 5G (5G integrated tester, base station) are a total integrated unit.

[0101] SS 4G (4G integrated tester, base station) and SS 5G (5G integrated tester, base station) are the fixed parts of the connection and switching combination: because 4G and 5G are combined into a non-independent 5G network, and the single SS 5G is an independent 5G network, the two must switch or coexist independently. Outside the integrated unit, the PC controls the base station's power on and off and reads the signaling.

[0102] The integrated unit is connected to the darkroom by four antennas, and the SG and SA on the right are connected to the darkroom through antennas respectively;

[0103] In the darkroom, the PC controls the EUT switch and flight, and reads the status value of the prototype;

[0104] This technical solution integrates full-band parallel signal generation and high-precision spectrum analysis in a test environment, supporting the simultaneous radiation of six signals from 2G to 5G and satellite bands. The central control unit dynamically loads a priority policy library based on service type, forcing voice services to trigger CM Service Request signaling to directly connect to the 2G network and data services to directly connect to 5G PDU sessions, achieving intelligent network selection and matching. The spectrum analysis unit performs three-order parallel operations with a real-time bandwidth of 256MHz: full-band scanning to capture transient interference, demodulation layer 1 signaling to verify 80ms-level MR event response, and dynamic monitoring of satellite band isolation of >60dB, achieving a multi-frequency mutual interference positioning accuracy of 0.1ppm.

[0105] A programmable robotic arm simulates 360-degree terminal rotation. Combined with the baseband chip's real-time RSSI / SINR / BER logs, it completes full-scenario verification, including NSA / SA networking switching, multi-standard priority coordination, and satellite joint positioning, in a single test. This improves test efficiency compared to traditional serial solutions. The polarization-isolated chamber architecture and dynamic strategy engine provide closed-loop support for terminal RF performance optimization. Cellular signals are radiated with vertical linear polarization using a wall-mounted log-periodic antenna, while satellite signals are transmitted with right-hand circular polarization via a top-mounted spiral antenna. Physical layer isolation exceeds the 60dB limit, enabling satellite positioning to maintain a 35dB-Hz carrier-to-noise ratio at a critical sensitivity of -148dBm. This supports 99.999% reliability verification for URLLC scenarios in the 3GPP R16 protocol, promotes the standardization of 5G+Beidou multi-frequency converged terminals, and enables mutual recognition of test data in smart cities, industrial internet, and other fields.

[0106] Reference Figure 5 As shown, the multi-frequency complex mode terminal signal testing equipment includes a storage device and a processor. The storage device is used to store computer programs, and the processor runs the computer program to enable the multi-frequency complex mode terminal signal testing equipment to execute the multi-frequency complex mode terminal signal testing method mentioned above. The new multi-frequency complex mode terminal signal testing system is more effective in detecting the switching of signals in multiple signal cells, the transformation of signals, the type of signals tested under laboratory conditions, and the strength and weakness of various signals under real conditions, the terminal's ability to prioritize signal selection, and verify whether communication and accurate satellite positioning can be carried out simultaneously.

[0107] In this embodiment, the entire operation process can be controlled by a computer to provide signal feedback to implement the steps in sequence. These are all conventional knowledge of current automated control and will not be described in detail in this embodiment.

[0108] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-frequency complex mode terminal signal testing method, characterized in that: Applied to electronic signal testing equipment, specifically including the following steps: S101: Receive a signal test command sent by the terminal, generate signal configuration information, and send it to a configuration integrated tester. The configuration integrated tester generates 2G and 3G signals, radiates dual-frequency signals through a darkroom coupling antenna, and the terminal performs a network search. The spectrum analyzer synchronously captures the signal frequency domain characteristics to verify whether the terminal first locks onto the GSM time slot frame when a call command is triggered, and whether the terminal first establishes a WCDMA dedicated channel when a data service is requested, thereby completing multi-band coexistence and network priority testing. S102: After confirming that the GSM time slot frame is locked and the WCDMA dedicated channel is established, the 4G integrated tester and the 5G integrated tester are connected in parallel to the dual-frequency signal radiated by the coupled antenna in the darkroom. The terminal first establishes a 4G connection and then activates the 5G non-standalone network. The spectrum analyzer is used to monitor the changes in the dual-link signal strength in real time. While gradually reducing the minimum input level of the 4G signal source output power, the 5G signal receiving power reported by the terminal is verified. The 4G and 5G signal sources are synchronously turned off. The spectrum analyzer records the attenuation characteristics of the signal strength of all frequency bands down to the noise floor within a preset time, completing the 4G / 5G non-standalone network interoperability test; S103: Start the 5G integrated tester separately and configure it in SA mode. Output the n41 frequency band signal. After the terminal first connects to the 5G network, immediately turn off the 5G signal source and simultaneously activate the 4G signal source to verify whether the terminal switches to the 4G network within the preset time after the 5G signal is lost. Then, re-enable the 5G signal source to verify whether the terminal switches back to the 5G network within the preset time. Finally, turn off the 4G signal source separately and use the spectrum analyzer to continuously monitor the 5G frequency band to confirm that the terminal maintains a 5G connection and the signal strength fluctuation range is within the range. Confirm that the spectrum graph shows the n41 single carrier characteristics. The 5G independent network switching test is completed. S104: Synchronously start four independent signal sources: 2G, 3G, 4G, and 5G. The terminal verifies the dynamic network selection strategy. When a call service is initiated, the terminal is forced to first connect to the 2G network. After the 2G signal is interrupted, the order in which the terminal attempts to connect to the 5G, 4G, and 3G networks and the switching delay are recorded, completing the multi-standard dynamic priority coordination test of the call service. S105: When a data service is initiated, the terminal is forced to prioritize access to the 5G network. After the 5G signal is interrupted, it is verified that it switches to 4G → 3G → 2G in descending order. During the test, the spectrum analyzer is used to capture the occupancy status of each frequency band in real time to confirm whether only one standard is in an active connection state at any time, completing the multi-standard dynamic priority coordination test of data services.

2. The multi-frequency complex pattern terminal signal testing method according to claim 1, wherein: In S101, a signal test instruction sent by a terminal is received, and signal configuration information is generated and sent to a configuration integrated tester, so that the configuration integrated tester generates 2G and 3G signals, including: The center frequency of the 2G signal configured by the comprehensive tester is 900 MHz, the center frequency of the 3G signal is 2100 MHz, and the signal strength is set to -85 dBm.

3. The multi-frequency complex pattern terminal signal testing method according to claim 2, wherein: In S102, the 4G integrated tester and the 5G integrated tester are connected in parallel to the dual-frequency signal radiated by the coupled antenna in the darkroom. The terminal first establishes a 4G connection and then activates the 5G non-standalone network, including: In 5G NSA mode, the 4G base station is configured as the anchor point and the 5G base station as the auxiliary node. After the terminal initially attaches to the 4G network, the establishment of a 5G dual connection is triggered through interface signaling. The spectrum analyzer must simultaneously display the spectrum waveforms of the 4G primary carrier and the 5G secondary carrier. When the 4G signal strength decreases linearly from -85dBm to -110dBm, the 5G RSRP reported by the terminal increases from -90dBm to -65dBm, and the signal-to-interference-plus-noise ratio remains above 15dB. During the dual-link disconnection phase, the terminal should send SCG Failure signaling and observe that the number of 5G PRACH preamble code retransmissions does not exceed 3 times on the spectrum analyzer.

4. The multi-frequency complex pattern terminal signal testing method according to claim 3, wherein: In S103, after the terminal first accesses the 5G network, the 5G signal source is immediately turned off and the 4G signal source is simultaneously activated to verify whether the terminal switches to the 4G network within the preset time after the 5G signal is lost, including: The 5G SA network is configured in TDD mode with a subcarrier spacing of 30kHz and an SSB period of 20ms. The 4G network is configured in FDD mode with a bandwidth of 10MHz. When a terminal is connected to 5G and performing a VoNR voice call, if the 5G signal suddenly drops by 20dB, the terminal triggers the 5G source shutdown command to start the EPS Fallback process, and falls back to 4G VoLTE through the N26 interface. The voice interruption time during the handover process is ≤300ms. After reactivating the 5G signal, the terminal triggers a return operation based on the measurement event that the quality of the neighboring cell of the different system is higher than the threshold. The spectrum analyzer needs to capture the spectrum characteristics of the message sent by the terminal in the 2.5GHz frequency band.

5. The multi-frequency complex pattern terminal signal testing method according to claim 4, wherein: In S104, the order in which the terminal attempts to connect to the 5G, 4G, and 3G networks and the handover delay are recorded, completing the multi-standard dynamic priority coordination test of the call service, including: Differentiated cell parameters are configured for each standard. The differentiated cell parameters are: LAC = 1001 for 2G cells, SID = 2001 for 3G cells, TAC = 3001 for 4G cells, and TAC = 4001 for 5G cells. When the terminal is in idle state, a dedicated test command is used to forcibly clear the network preference list. During call service testing, the initial 2G signal strength is set to -75dBm, and the other standards are all -85dBm. After the terminal initiates a call, it needs to parse the Um interface signaling to confirm that it first sends a CM Service Request to the 2GMSC.

6. The multi-frequency complex pattern terminal signal testing method according to claim 5, wherein: In S105, the spectrum analyzer is used to capture the occupancy status of each frequency band in real time to confirm whether only one standard is in an active connection state at any time. This completes the multi-standard dynamic priority coordination test for data services, including: During data service testing, the 5G signal strength is set to -70dBm, and the other standards are all -95dBm. The terminal should initiate a PDU session establishment request to the 5G AMF. When data services are interrupted, the 5G signal is turned off and the terminal is redirected to 4G based on the communication network instructions. When the 4GSINR is less than 0dB, the CDMA2000 1xEV-DO connection is started, and finally the connection is dropped to the GPRS network when the wireless environment deteriorates. Each handover requires capturing the RACH access burst signal of the target frequency band through a spectrum analyzer, and recording the time sequence from the source base station receiving the communication network to the target base station completing the RRC Setup.

7. The multi-frequency complex pattern terminal signal testing method according to claim 6, wherein: In addition to call or data service signals, GPS / Beidou satellite signal sources are added, including: The terminal starts the satellite positioning software while performing calls or data services; Use a spectrum analyzer to scan the 1164-1610 MHz frequency band to confirm that there is no frequency overlap between the satellite signal and the cellular signal and that the control isolation is greater than 60 dB; The number of visible satellites and longitude and latitude coordinates in the terminal positioning information were read, and finally the satellite signal strength was gradually reduced from -130dBm to -155dBm to verify that the terminal lost its positioning capability when the signal strength was below -148dBm.

8. The multi-frequency complex pattern terminal signal testing method according to claim 7, wherein: Confirm that there is no frequency overlap between satellite and cellular signals and that the control isolation is greater than 60dB, including: The satellite signal source outputs right-hand circularly polarized waves, which are radiated by the spiral antenna on the top of the conical anechoic chamber. The cellular signal source outputs vertically polarized waves, which are radiated by the log-periodic antenna on the side wall. The spectrum analyzer uses a directional coupler to separate the two signals. The satellite signal power spectral density at 1575 MHz must be 15 dB above the noise floor, while the cellular band spurious emissions at this frequency must be below -110 dBm / MHz. When the terminal initiates uplink transmission, the spectrum analyzer scans the 1575MHz frequency band and no burst pulses appear, confirming that there is no frequency rebound interference. 9.Multi-frequency complex mode terminal signal test system, characterized in that: Used to perform the terminal signal testing method according to any one of claims 1 to 8, the terminal signal testing system comprises: The multi-band signal generation unit includes 2G signal sources, 3G signal sources, 4G signal sources, 5G signal sources, and satellite signal sources connected in parallel. The output power dynamic range of each signal source covers -155dBm to +30dBm, and is connected to the darkroom antenna system through an RF combiner. The central control unit is used to run the automated test software, synchronously control the start and stop of the signal source, power adjustment, and system switching through the GPIB / LAN bus, and configure a dynamic priority policy library to force 2G priority access for voice services and 5G priority access for data services; Spectrum analysis unit, used for vector signal analyzers with real-time bandwidth ≥ 256MHz. The input port is connected to the anechoic chamber antenna via a directional coupler and performs third-order operations in real time: Scan the entire 800MHz-6GHz frequency band to capture the spectrum of multiple signals coexisting; Demodulate GSM / WCDMA / LTE / NR signals to verify the delay of MR event triggering; The isolation between the monitoring satellite frequency band and the cellular frequency band is greater than 60dB; The terminal interaction verification unit completes information interaction with the terminal and includes: a programmable robotic arm for fixing the terminal at the center of the darkroom and enabling 0-360° rotation; a data acquisition interface for real-time acquisition of RSSI / SINR / BER logs of the terminal baseband chip; and a service simulation module for generating VoLTE / VoNR voice calls and FTP / UDP data streams. The darkroom environment unit is used to generate corresponding application environment scenarios and is implemented through practical internal integration.

10. Multi-frequency complex mode terminal signal test equipment, characterized in that: It includes a storage device and a processor, the storage device is used to store a computer program, and the processor runs the computer program to enable the multi-frequency complex pattern terminal signal testing device to perform the multi-frequency complex pattern terminal signal testing method according to any one of claims 1-8.

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