Air interface test system and air interface test method

Abstract

The invention provides an air interface testing system, and relates to the technical field of OTA testing, the system can comprise a reverberation chamber and a radio frequency shielding box, and the reverberation chamber is used for providing an electromagnetic environment for air interface testing of to-be-tested wireless equipment. The radio frequency shielding box is used for providing an environment without external electromagnetic interference for an air interface test of a to-be-tested wireless device. The calculation control equipment calculates the total omnidirectional sensitivity of the to-be-tested wireless equipment according to the ratio of the product of the output power of the to-be-tested wireless equipment in the radio frequency shielding box and the sensitivity of the radio frequency channel to the total radiation power of the to-be-tested wireless equipment in the reverberation chamber; the output power is the output power at the antenna port of the radio frequency front-end circuit of the to-be-tested wireless equipment, so that the total omnidirectional sensitivity can be calculated according to the total radiation power, and the signal transmitting power does not need to be gradually reduced for testing at different angles (microwave darkroom testing) or different stirring states (reverberation room testing); and the time for testing the total omnidirectional sensitivity is reduced.

Description

Technical Field

[0001] The present application relates to the field of OTA testing technology, and in particular to an air interface testing system and an air interface testing method. Background Art

[0002] The Over the Air (OTA) test method evaluates the performance of wireless devices by simulating the propagation of wireless signals in the air. It has now become a standard test method for wireless terminal devices such as mobile phones.

[0003] Currently, air interface test methods mainly evaluate the total radiated power (Total Radiated Power) of the transmitter and the combined total isotropic sensitivity (Combined Total Isotropic Sensitivity) of the receiver.

[0004] Since the total omnidirectional sensitivity test requires gradually reducing the signal transmission power at different angles (microwave darkroom test) or different stirring states (reverberation chamber test) to measure the minimum received power when the bit error rate reaches the threshold, it is more time-consuming than the test, which brings a higher time cost to the R&D and production line testing of wireless devices. Summary of the invention

[0005] The air interface test system and air interface test method provided in the present application are used to reduce the time for testing total omnidirectional sensitivity, thereby reducing the time cost for the research and development and production line testing of wireless devices.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions: In a first aspect, the present application provides an air interface test system, which may include: a reverberation chamber and a radio frequency shielding box; The reverberation chamber is used to provide an electromagnetic environment for air interface testing of wireless devices under test.

[0007] The RF shielding box is used to provide an environment without external electromagnetic interference for the air interface test of the wireless device to be tested, so that the computing control device can calculate the total omnidirectional sensitivity of the wireless device to be tested based on the output power of the RF front-end circuit antenna port of the wireless device to be tested in the RF shielding box and the product of the RF channel sensitivity and the total radiated power of the wireless device to be tested in the reverberation chamber. The output power here is the output power at the antenna port of the RF front-end circuit of the wireless device to be tested. In this way, the total omnidirectional sensitivity can be calculated based on the measured total radiated power, so there is no need to gradually reduce the signal transmission power for testing at different angles (microwave darkroom test) or different stirring states (reverberation chamber test), which reduces the time for testing the total omnidirectional sensitivity, thereby reducing the time cost for the research and development and production line testing of wireless devices.

[0008] Specifically, the total omnidirectional sensitivity is calculated based on the ratio of the product of the output power and the RF channel sensitivity to the total radiated power: ; Where P0 is the output power at the antenna port of the RF front-end circuit of the wireless device under test, P s is the RF channel sensitivity, P TIS is the total omnidirectional sensitivity, P TRP is the total radiated power.

[0009] In some possible implementations, the air interface test system may also include: a radio frequency channel switching device, a comprehensive tester, a vector network analyzer, and a computing control device, wherein the radio frequency channel switching device is used to communicate bidirectionally with the computing control device to control the connection and switching of the radio frequency link during the test. This eliminates the need for manual intervention in the test process, thereby improving the efficiency and accuracy of the test. The comprehensive tester is used to measure the output power and radio frequency channel sensitivity of the radio frequency front-end circuit antenna port of the wireless device under test in the radio frequency shielding box. The vector network analyzer is used to measure the total radiated power of the wireless device under test in the reverberation chamber.

[0010] The measuring antenna in the reverberation chamber can be connected to the RF port of the comprehensive tester through the RF channel switching device; the reference antenna in the reverberation chamber is placed on a turntable in the reverberation chamber and connected to the RF port of the comprehensive tester through the RF channel switching device; the vector network analyzer is connected to the reference antenna and the measuring antenna through the RF channel switching device, and the vector network analyzer is connected to the computing control device through the LAN port; the RF channel switching device and the comprehensive tester can be connected to the computing control device through the LAN port; the RF channel switching device is connected to at least one of the N probe antennas in the RF shielding box. For example, N can be 4, and 4 probe antennas can provide more comprehensive signal coverage and receiving capabilities, thereby improving the accuracy of the test results.

[0011] When it is necessary to measure the total radiated power of the wireless device to be tested in the reverberation chamber, the computing control device can also be used to perform two-way communication with the comprehensive tester and the RF channel switching device through the LAN port and perform two-way communication with the wireless device to be tested placed in the reverberation chamber; Control the reverberation chamber transfer table and mechanical stirrer to change the stirring state in the reverberation chamber, control the vector network analyzer to start, control the reference antenna, RF channel switching equipment, integrated tester and the wireless device to be tested to form a communication link, control the measurement antenna, RF channel switching equipment, vector network analyzer and the wireless device to be tested to form a communication link. In this way, the vector network analyzer can measure the total radiated power of the wireless device to be tested based on these communication links.

[0012] In some possible implementations, when it is necessary to measure the output power and RF channel sensitivity of the RF front-end circuit antenna port of the wireless device under test in the RF shielding box, the computing control device can also be used to control the probe antenna and the wireless device under test to be connected through air interface radiation and to control the two-way communication between the probe antenna and the wireless device under test; The wireless device under test, the RF channel switching device and the integrated tester form an uplink RF link and a downlink RF link, and the integrated tester and the RF channel switching device are controlled to communicate bidirectionally with the computing control device through the LAN port. In this way, the integrated tester can measure the output power at the antenna port of the RF front-end circuit of the wireless device under test and the RF channel sensitivity based on these communication links.

[0013] In some possible implementations, the computing control device can also be used to control the connection between the power interface of the RF channel switching device and the power interface of the reverberation chamber, or to control the connection between the power interface of the RF channel switching device and the power interface of the RF shielding box.

[0014] Exemplarily, for example, when it is necessary to measure the total radiated power of the wireless device under test in a reverberation chamber, the computing control device can control the power interface of the RF channel switching device to be connected to the power interface of the vector network analyzer to control the vector network analyzer to start and form a communication link with the wireless device under test, thereby enabling the vector network analyzer to measure the total radiated power of the wireless device under test in the reverberation chamber.

[0015] When it is necessary to measure the output power and RF channel sensitivity of the RF front-end circuit antenna port of the wireless device under test in the RF shielding box, the computing control device can control the power interface of the RF channel switching device to be connected to the power interface of the comprehensive tester, so as to control the comprehensive tester to start and form a communication link with the wireless device under test, so that the comprehensive tester can measure the output power and RF channel sensitivity of the RF front-end circuit antenna port of the wireless device under test in the RF shielding box. In this way, the computing control device can automatically control which device the power interface of the RF channel switching device is connected to, so that the entire test system can complete the air interface test without manual intervention.

[0016] In a second aspect, the present application provides an air interface testing method, which can be applied to a computing control device, including: The output power, RF channel sensitivity, and total radiated power of the wireless device under test in the reverberation chamber are obtained, wherein the output power is the output power at the antenna port of the RF front-end circuit of the wireless device under test. The total omnidirectional sensitivity of the wireless device under test is calculated based on the ratio of the product of the output power and the RF channel sensitivity to the total radiated power of the wireless device under test in the reverberation chamber. The specific calculation formula can be as shown in the first aspect, and no redundant description is given here.

[0017] In some possible implementations, when it is necessary to measure the total radiated power of the wireless device to be tested in a reverberation chamber, the present application can also control the reverberation chamber turntable and the mechanical stirrer to change the stirring state in the reverberation chamber, control the start-up of the vector network analyzer, control the reference antenna, the RF channel switching device, the integrated tester and the wireless device to be tested to form a communication link, and control the measurement antenna, the RF channel switching device, the vector network analyzer and the wireless device to be tested to form a communication link.

[0018] When it is necessary to measure the output power and RF channel sensitivity of the wireless device under test in the RF shielding box, the present application can also control the probe antenna in the RF shielding box and the wireless device under test to be connected through air interface radiation and control the two-way communication between the probe antenna and the wireless device under test; control the uplink RF link and the downlink RF link between the wireless device under test, the RF channel switching device and the comprehensive tester and control the comprehensive tester and the RF channel switching device to communicate two-way with the computing control device through the LAN port.

[0019] In some possible implementations, the present application can also control the power interface of the RF channel switching device to be connected to the power interface of the reverberation chamber, or control the power interface of the RF channel switching device to be connected to the power interface of the RF shielding box, which specifically corresponds to the content of the first aspect and will not be described in detail here.

[0020] In a third aspect, the present application provides a computing control device, including: a processor and a memory; One or more computer programs are stored in the memory, and the one or more computer programs include instructions; when the instructions are executed by the processor, the computing control device executes the method described in any one of the second aspects.

[0021] In a fourth aspect, the present application provides a computer storage medium comprising computer instructions, which, when executed on a computer control device, enables the computer control device to execute the method described in any one of the second aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1A schematic diagram of the structure of an air interface test system provided in an embodiment of the present application; Figure 2 A schematic diagram of the structure of another air interface test system provided in an embodiment of the present application; Figure 3 A schematic diagram of the structure of a reverberation chamber provided in an embodiment of the present application; Figure 4 A schematic diagram of the structure of a radio frequency shielding box provided in an embodiment of the present application; Figure 5 A schematic diagram of a probe antenna and a wireless device to be tested connected via air interface radiation provided in an embodiment of the present application; Figure 6 A flowchart of an air interface testing method provided in an embodiment of the present application; Figure 7 A schematic diagram of the structure of a computing control device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0023] The terms "first", "second", "third", etc. in the specification, claims and drawings of this application are used to distinguish different objects rather than to limit a specific order.

[0024] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0025] Accurate testing of the RF performance of wireless devices can provide a reference for design optimization in the R&D and production processes. The RF performance of wireless devices is mainly related to the active performance of the RF transceiver circuit and the passive performance of the antenna.

[0026] Traditional conduction testing directly connects the RF circuit of a wireless device to the measuring instrument through an RF cable, which can simply and accurately test the active characteristics of the wireless device. Passive performance can be measured by measuring the antenna pattern in a microwave darkroom, and the active and passive performance are added together to evaluate the overall RF performance of the wireless device. Since the antenna will introduce additional noise and interference from the environment when it is in normal working condition, the actual overall RF performance is often inferior to the value of directly adding the active and passive performance. Therefore, the Over the Air (OTA) test method is generally used to test the entire wireless device using an over-the-air radiation connection instead of a cable connection. The over-the-air test method evaluates the performance of the wireless device by simulating the propagation of wireless signals in the air, and can accurately evaluate the overall RF performance of the wireless device in real scenarios.

[0027] At present, international standard organizations such as CTIA and 3GPP have stipulated that the standard air interface test method under the Single Input Single Output (SISO) scenario includes total radiated power (TRP) and total isotropic sensitivity (TIS). That is, the current air interface test mainly evaluates the total radiated power (Total Radiated Power) of the transmitter and the combined total isotropic sensitivity (Combined Total Isotropic Sensitivity) of the receiver.

[0028] Since the total omnidirectional sensitivity test requires gradually reducing the signal transmission power at different angles (microwave darkroom test) or different stirring states (reverberation chamber test) to measure the minimum received power when the bit error rate reaches the threshold, for example, the reverberation chamber test method needs to measure 579 stirring states, and the microwave darkroom test method needs to measure 264 angles. Therefore, the total omnidirectional sensitivity test takes a long time, which brings a high time cost to the R&D and production line testing of wireless devices.

[0029] In view of this, the present application provides an air interface test system, including: a reverberation chamber and a radio frequency shielding box, wherein the reverberation chamber can be used to provide an electromagnetic environment for the air interface test of the wireless device to be tested. The radio frequency shielding box can be used to provide an environment without external electromagnetic interference for the air interface test of the wireless device to be tested, so that the computing control device calculates the total omnidirectional sensitivity of the wireless device to be tested according to the ratio of the output power of the wireless device to be tested in the radio frequency shielding box and the product of the radio frequency channel sensitivity and the total radiation power of the wireless device to be tested in the reverberation chamber, wherein the output power is the output power at the antenna port of the radio frequency front-end circuit of the wireless device to be tested, so that after calculating the total radiation power of the wireless device to be tested in the reverberation chamber, the total omnidirectional sensitivity can be calculated according to the total radiation power, thereby eliminating the need to gradually reduce the signal transmission power at different angles (microwave darkroom test) or different stirring states (reverberation chamber test) for testing, thus reducing the time for testing the total omnidirectional sensitivity, improving the test efficiency, and thus reducing the time cost for the research and development and production line testing of wireless devices. And compared with the prior art using microwave darkroom testing, it can reduce a certain cost.

[0030] In order to make the technical solution of the present application clearer and easier to understand, the following describes the air interface test system provided by the present application in combination with the above embodiments and corresponding drawings. This may be referred to as Embodiment 1, which is exemplary. Figure 1 As shown, the air interface test system provided in the first embodiment of the present application may include: a reverberation chamber 11 and a radio frequency shielding box 12; The reverberation chamber 11 is used to provide an electromagnetic environment for air interface testing of the wireless device to be tested.

[0031] The radio frequency shielding box 12 is used to provide an environment without external electromagnetic interference for the air interface test of the wireless device to be tested, so that the computing control device is used to calculate the output power P0, the radio frequency channel sensitivity P0 of the wireless device to be tested in the radio frequency shielding box. s And the total radiated power P of the wireless device under test in the reverberation chamber TRP Calculate the total omnidirectional sensitivity P of the wireless device under test TIS .

[0032] In some possible implementations, the air interface test system provided in the embodiment of the present application may also include a computing control device 13, so that when the P value of the wireless device to be tested is measured in the reverberation chamber, TIS It can be sent to the computing control device 13 in the air interface test system to measure the P0 and P s The data is sent to the computing control device 13 in the air interface test system, so that the computing control device 13 can calculate the data according to P0, P s and P TRP Calculate the P of the device under test TIS .

[0033] In some possible implementations, according to P0, P s and P TRP Calculate the P of the device under test TRP The formula can be shown as formula (1): (1) The specific method for obtaining formula (1) in the embodiment of the present application may be introduced below. Before introducing the specific method for obtaining formula (1), the connection relationship between the various components in the air interface detection system provided in the embodiment of the present application may be introduced first.

[0034] For example, Figure 2 As shown, the air interface test system provided in the embodiment of the present application may also include: a radio frequency channel switching device 14, a comprehensive tester 15 and a vector network analyzer 16. Among them, the comprehensive tester can be, for example, a CMW500 comprehensive tester, and the radio frequency channel switching device 14 can be used for two-way communication with the computing control device to control the connection and switching of the radio frequency link during the test. This eliminates the need for manual intervention in the test process, thereby improving the efficiency and accuracy of the test. The comprehensive tester 15 can be used to measure the output power and radio frequency channel sensitivity of the radio frequency front-end circuit antenna port of the wireless device under test in the radio frequency shielding box. The vector network analyzer 16 can be used to measure the total radiated power of the wireless device under test in the reverberation chamber.

[0035] For example, Figure 3 As shown, the reverberation chamber 11 may include: a turntable 1, a reference antenna 2, a mechanical stirrer 3, a USB connection line 4, an absorbing material 5, a radio frequency cable 6 and a measuring antenna 7. The inner wall of the reverberation chamber is provided with a USB interface, a radio frequency interface and a power interface, wherein the power interface of the reverberation chamber 11 is used to connect to the power interface of the comprehensive tester 15. The USB interface can be used to connect to the USB cable 4, and the radio frequency interface is used to connect to the radio frequency cable 6, so that the measuring antenna 7 and the reference antenna 2 are connected to the radio frequency channel switching device 14 using the radio frequency cable 6, wherein the reference antenna 2 is used to provide known signal characteristics for comparison with the signal performance of the wireless device under test (DUT) to ensure the accuracy and repeatability of the test results. The measuring antenna 7 is used to receive signals sent by the DUT or send signals to the wireless device under test.

[0036] Specifically, the measuring antenna 7 is connected to the RF port of the comprehensive tester 15 through the RF channel switching device 14, so as to establish a communication link between the comprehensive tester 11 and the wireless device 8 to be tested. The reference antenna 2 is placed on the turntable 1, and is connected to the RF port of the comprehensive tester 15 through the RF channel switching device 14, so as to establish a communication link between the comprehensive tester 14 and the wireless device 8 to be tested. The vector network analyzer 16 is connected to the reference antenna 2 and the measuring antenna 7 through the RF channel switching device 14, and the vector network analyzer 16 is connected to the computing control device 13 through the LAN port, so as to facilitate the testing and recording of the S parameters. The S parameters here, i.e., the scattering parameters, are a kind of parameters used in the microwave and RF fields to describe the electrical behavior of a network or a device under the excitation of a RF signal. In addition, the RF channel switching device 14 and the comprehensive tester 11 can be connected to the computing control device 13 through the LAN port to realize two-way communication with the computing control device 13.

[0037] When the wireless device 8 to be detected is placed in the reverberation chamber 11, the power interface of the RF channel switching device 14 is connected to the power interface of the reverberation chamber 11, the wireless device 8 to be detected is placed on the turntable 1, and the wireless device 8 to be detected is connected to the computing control device 13 through the USB cable 4 connected to the USB interface, so as to realize the automatic control of the wireless device 8 to be detected by the computing control device 13 and enable the computing control device 13 to automatically establish a stable connection with the comprehensive tester 11 during the test without manual intervention.

[0038] The absorbing material 5 placed in the reverberation chamber 11 can be used to adjust the coherent bandwidth in the reverberation chamber. The coherent bandwidth refers to the frequency width within a certain frequency range where the phase change of the electromagnetic wave can be ignored. In the reverberation chamber, by adjusting the position and amount of the absorbing material, the propagation characteristics of the electromagnetic waves in the chamber can be changed, thereby affecting the size of the coherent bandwidth. That is, the absorbing material can absorb the incident electromagnetic waves, reduce reflection and scattering, and help to form a more uniform and isotropic electromagnetic field distribution in the reverberation chamber.

[0039] When the reverberation chamber 11 is needed to measure the total radiated power P of the device under test TIS When the wireless device 8 to be detected is placed on the turntable 1 in the reverberation chamber 11, the computing control device can be specifically used to establish a serial communication protocol connection with the built-in turntable 1 in the reverberation chamber 11 and the mechanical stirrer 3, to establish two-way communication with the comprehensive tester 15 and the RF channel switching device 14 through the LAN port, and to establish two-way communication with the wireless device 8 to be detected placed in the reverberation chamber 11.

[0040] Control the turntable 1 and the mechanical stirrer 3 to change the stirring state in the reverberation chamber, control the vector network analyzer to start, control the measurement antenna 7, the RF channel switching device 14, the integrated tester 15 to form a communication link with the wireless device to be tested 8. Control the reference antenna 2, the RF channel switching device 14, the integrated tester 15 to form a communication link with the wireless device to be tested 8. Control the measurement antenna 7, the RF channel switching device 14, the vector network analyzer 16 to form a communication link with the wireless device to be tested 8.

[0041] In some possible implementations, the integrated tester can be used to calculate the power transfer function of the wireless device to be tested based on the above communication link. (mainly used to evaluate and test the wireless transmission performance of the wireless device under test), the specific formula can be shown as formula (2): (2) in, To calculate the control device to control the rotation angle of the turntable and mechanical stirrer in the reverberation chamber, traverse all stirring states and record the transmission coefficient of the i-th stirring state at the j-th frequency point. To traverse all stirring states and record the received power of the measuring antenna under the i-th stirring state, we have stirring state, a total of samples, To test the antenna efficiency of the antenna, It is the impedance matching loss when the wireless device under test is working.

[0042] In some possible implementations, the vector network analyzer can also be used to calculate the power transfer function in the reference test (The power transfer function in the reference test is usually based on ideal or standard conditions, using a reference antenna with known characteristics to simulate the transmission characteristics of the wireless device). The specific formula is shown in formula (3): (3) in, is the antenna efficiency of the reference antenna in the reverberation chamber, is the standard impedance matching loss when the reference antenna is working, N F is the number of frequency points , is the total test bandwidth for the reference test, is the coherence bandwidth in the reverberation chamber, a total of samples.

[0043] In some possible implementations, a vector network analyzer can be used to as well as , calculate the total radiated power P of the wireless device under test TIS Since the stirring conditions in the DUT test and the reference test are the same, under the premise of sufficient stirring, the power transfer function of the DUT test is Equal to the power transfer function in the reference test , then calculate P TIS The specific formula is shown in formula (4) and (5): (4) Eliminate unknowns and The total radiated power P of the device under test can be calculated TRP .

[0044] (5) The structure and connection relationship of the reverberation chamber 11 and the functions of related components are introduced above. The radio frequency shielding box 12 and the connection relationship are introduced below. For example, Figure 4 As shown, the radio frequency shielding box 12 may include a USB cable 4 , an absorbing material 5 , a radio frequency cable 6 and N test probe antennas 9 .

[0045] The comprehensive tester 15 and the RF channel switching device 14 can be connected via a RF cable 6, and the RF channel switching device 14 and the test probe antenna 9 can be connected. For example, the RF channel switching device 14 and the test probe antenna 9 can be connected via a RF cable 6. It should be noted that the RF channel switching device 14 can be connected to at least one of the N probe antennas via a RF cable 6, or can be connected to each of the N probe antennas via a RF cable 6. Those skilled in the art can set it according to actual needs, and no limitation is made here. For example, the N probes can be 4, and the 4 probe antennas can provide more comprehensive signal coverage and receiving capabilities, thereby improving the accuracy of the test results.

[0046] When the wireless device 8 to be tested is placed in any position in the radio frequency shielding box 12, the wireless device 8 to be tested can be connected to the computing control device 13 via the USB connection line 4. The power interface of the radio frequency channel switching device 14 is connected to the power interface of the radio frequency shielding box 12.

[0047] When it is necessary to use the radio frequency shielding box 12 to detect the output power P0 at the antenna port of the radio frequency front-end circuit of the wireless device to be tested and the radio frequency channel sensitivity P s When the computing control device can be specifically used to control the probe antenna 9 and the wireless device to be tested 8 to be connected via air interface radiation (such as Figure 5 As shown), to control the two-way communication between the probe antenna 9 and the wireless device to be tested 8. The wireless device to be tested 8, the RF channel switching device 14 and the comprehensive tester 15 are controlled to form an uplink RF link and a downlink RF link, so that the comprehensive tester 15 and the RF channel switching device 14 can communicate with the computing control device 13 through the LAN port. It should be noted that the uplink RF link here can be the path for the wireless device to be tested to send a signal to the comprehensive tester. In this link, the wireless device to be tested can be used as a signal transmission source, and the signal is transmitted to the comprehensive tester through the RF channel switching device for performance testing and analysis. The downlink RF link can be the path for sending a signal from the comprehensive tester to the wireless device to be tested. In this link, the comprehensive tester can be used as a signal transmission source, and the signal is transmitted to the wireless device through the RF channel switching device.

[0048] The computing control device can also be used to perform two-way communication with the wireless device 8 to be detected placed in the radio frequency shielding box 12 .

[0049] The comprehensive tester 15 can be used to measure the output power P0 and the RF channel sensitivity P0 at the antenna port of the RF front-end circuit of the wireless device to be tested placed in the RF shielding box based on the RF link composed as above. s .

[0050] In some possible implementations, the computing control device can also be used to control the connection between the power interface of the RF channel switching device and the power interface of the reverberation chamber, or to control the connection between the power interface of the RF channel switching device and the power interface of the RF shielding box.

[0051] Exemplarily, for example, when it is necessary to measure the total radiated power of the wireless device under test in the reverberation chamber, the wireless device under test can be placed on a turntable in the reverberation chamber, and the computing control device can control the power interface of the RF channel switching device to be connected to the power interface of the vector network analyzer, control the vector network analyzer to start and form a communication link with the wireless device under test, so that the vector network analyzer can measure the total radiated power of the wireless device under test in the reverberation chamber.

[0052] When it is necessary to measure the output power and RF channel sensitivity of the RF front-end circuit antenna port of the wireless device under test in the RF shielding box, the wireless device under test can be placed in the RF shielding box, and the computing control device can control the power interface of the RF channel switching device to be connected to the power interface of the comprehensive tester to control the comprehensive tester to start and form a communication link with the wireless device under test, so that the comprehensive tester can measure the output power and RF channel sensitivity of the RF front-end circuit antenna port of the wireless device under test in the RF shielding box. In this way, the computing control device can automatically control which device the power interface of the RF channel switching device is connected to, so that the entire test system can complete the air interface test without manual intervention.

[0053] In some possible implementations, after calculating the output power P0 and the RF channel sensitivity P s And measure the total radiated power P of the device under test TRP Afterwards, the computing device can be used to calculate the output power P0, the RF channel sensitivity P s And measure the total radiated power P of the device under test TRP Calculate the total omnidirectional sensitivity P of the device under test TRP , the specific formula can be shown as formula (6), (7) and (8): (6) (7) (8) in, The solid angle of the wireless device antenna under test Department Gain of polarization components; The solid angle of the wireless device antenna under test Department Gain of polarization components; is the average gain of the device under test in the spherical coordinate system, or the antenna efficiency.

[0054] The present application provides an air interface test system, including: a reverberation chamber, a radio frequency shielding box, a radio frequency channel switching device, a comprehensive tester, a vector network analyzer, and a computing control device. The measuring antenna in the reverberation chamber is connected to the radio frequency port of the comprehensive tester through the radio frequency channel switching device. The reference antenna in the reverberation chamber is placed on a turntable in the reverberation chamber and is connected to the radio frequency port of the comprehensive tester through the radio frequency channel switching device. The vector network analyzer is connected to the reference antenna and the measuring antenna through the radio frequency channel switching device, and the vector network analyzer is connected to the computing control device through a LAN port. The radio frequency channel switching device and the comprehensive tester are connected to the computing control device through a LAN port, and the radio frequency channel switching device is connected to at least one of the N probe antennas in the radio frequency shielding box. The reverberation chamber can be used to provide an electromagnetic environment for air interface testing of a wireless device to be tested. The RF shielding box can be used to provide an environment without external electromagnetic interference for the air interface test of the wireless device to be tested. The computing control device is used to control the reverberation chamber, the RF channel switching device, the comprehensive tester, the vector network analyzer and the wireless device to be tested to form a communication link so that the vector network analyzer measures the total radiated power of the wireless device to be tested in the reverberation chamber, and is used to control the RF shielding box, the RF channel switching device, the comprehensive tester and the wireless device to be tested to form a communication link so that the comprehensive tester measures the output power and RF channel sensitivity of the RF front-end circuit antenna port of the wireless device to be tested in the RF shielding box. The computing control device is also used to control the communication link between the reverberation chamber, the RF channel switching device, the comprehensive tester and the wireless device to be tested to form a communication link so that the comprehensive tester measures the output power and RF channel sensitivity of the RF front-end circuit antenna port of the wireless device to be tested in the RF shielding box. The total omnidirectional sensitivity of the wireless device under test is calculated by the ratio of the product of the output power of the device in the RF shielding box and the RF channel sensitivity to the total radiated power of the wireless device under test in the reverberation chamber. The output power is the output power at the antenna port of the RF front-end circuit of the wireless device under test. After calculating the total radiated power of the wireless device under test in the reverberation chamber, the total omnidirectional sensitivity can be calculated based on the total radiated power, thereby eliminating the need to gradually reduce the signal transmission power for testing at different angles (microwave darkroom test) or different stirring states (reverberation chamber test), thus reducing the time for testing the total omnidirectional sensitivity, thereby reducing the time cost for the research and development and production line testing of wireless devices.

[0055] In addition, the present application also provides an air interface test method, which corresponds to the above-mentioned air interface test system. In order to make the technical solution of the present application clearer and easier to understand, the air interface test method provided by the embodiment of the present application is introduced below in combination with the above-mentioned embodiment and the corresponding drawings. This can be referred to as embodiment 2. The method provided in embodiment 2 can be Figure 1 or Figure 2 The structure shown in the figure is implemented in the air interface test system. The following is an introduction with the computing control device as the execution subject. Figure 6As shown, the air interface test method may include but is not limited to the following: S61. Obtain the output power and RF channel sensitivity of the wireless device under test in the RF shielding box.

[0056] The computing and controlling device can obtain the output power and RF channel sensitivity of the wireless device under test in the RF shielding box. It should be noted that the output power here refers to the output power at the antenna port of the RF front-end circuit.

[0057] Specifically, the wireless device to be tested can be placed in a RF shielding box. Based on the physical connection relationship described in Example 1, the computing and control device can control the startup of the integrated tester, control the probe antenna in the RF shielding box and the wireless device to be tested to be connected through air interface radiation, and control the two-way communication between the probe antenna and the wireless device to be tested, control the formation of an uplink RF link and a downlink RF link between the wireless device to be tested, the RF channel switching device and the integrated tester, and control the two-way communication between the integrated tester and the RF channel switching device through the LAN port.

[0058] In this way, the comprehensive tester can measure the output power and RF channel sensitivity of the wireless device under test in the RF shielding box based on the above communication link, so that the calculation and control device can obtain the output power and RF channel sensitivity of the wireless device under test in the RF shielding box measured by the comprehensive tester.

[0059] S62. Obtain the total radiated power of the wireless device under test in the reverberation chamber.

[0060] The calculation control device can obtain the total radiation power of the wireless device to be tested in the reverberation chamber.

[0061] Specifically, the wireless device to be tested can be placed on a turntable in the reverberation chamber. Based on the physical connection relationship described in Example 1, the computing control device can control the turntable in the reverberation chamber and the mechanical stirrer to change the stirring state in the reverberation chamber, control the start-up of the vector network analyzer, control the reference antenna, the RF channel switching device, the integrated tester and the wireless device to be tested to form a communication link, and control the measurement antenna, the RF channel switching device, the vector network analyzer and the wireless device to be tested to form a communication link.

[0062] In this way, the vector network analyzer can measure the total radiation power of the wireless device under test in the reverberation chamber based on the above communication link, so that the calculation control device can obtain the total radiation power of the wireless device under test in the reverberation chamber measured by the vector network analyzer.

[0063] Specifically, the computing control device can control the rotation angle of the turntable and the mechanical stirrer in the reverberation chamber stirring state and record the transmission coefficient of the i-th stirring state at the j-th frequency point The vector network analyzer can calculate the power transfer function in the reference test based on formula (3) in the first embodiment. , and then the computing control device can control the vector network analyzer to start, control the measurement antenna, the RF channel switching device, the comprehensive tester, and the communication link between the vector network analyzer and the wireless device to be tested. The test is performed based on the communication link, so that the vector network analyzer can calculate the power transfer function of the wireless device to be tested based on formula (2) in the first embodiment. , and then the vector network analyzer can be based on the calculated as well as , calculate the total radiated power P of the wireless device under test TIS Since the stirring conditions in the DUT test and the reference test are the same, under the premise of sufficient stirring, the power transfer function of the DUT test is Equal to the power transfer function in the reference test , as shown in formulas (4) and (5) in the first embodiment. In this way, the vector network analyzer can measure the total radiated power of the wireless device under test in the reverberation chamber.

[0064] S63. Calculate the total omnidirectional sensitivity of the wireless device under test according to the ratio of the product of the output power and the radio frequency channel sensitivity to the total radiated power of the wireless device under test in the reverberation chamber.

[0065] The calculation control device can calculate the total omnidirectional sensitivity of the wireless device under test according to the ratio of the product of the output power and the RF channel sensitivity to the total radiated power of the wireless device under test in the reverberation chamber. The specific formula can be as shown in formula (1) in embodiment 1, which is not described in detail here.

[0066] Specifically, the calculation control device can obtain the calculation formula in formula (8) based on formula (6) and formula (7) in the first embodiment, and then finally obtain the formula in formula (1). Then, according to the output power at the antenna port of the RF front-end circuit of the wireless device to be tested in the RF shielding box, the RF channel sensitivity and the ratio of the total radiation power of the wireless device to be tested in the reverberation chamber, the total omnidirectional sensitivity of the wireless device to be tested can be calculated based on formula (1). In this way, after calculating the total radiation power of the wireless device to be tested in the reverberation chamber, the total omnidirectional sensitivity can be calculated based on the total radiation power, so that there is no need to gradually reduce the signal transmission power at different angles (microwave darkroom test) or different stirring states (reverberation chamber test) for testing, which reduces the time for testing the total omnidirectional sensitivity and improves the test efficiency, thereby reducing the time cost for the research and development and production line testing of wireless devices.

[0067] Exemplarily, three working frequency bands are selected, and the air interface test method provided in Example 2 (the fast omnidirectional sensitivity test in Table 1) and the method in the prior art (the reverberation chamber standard test in Table 1) are used to perform the omnidirectional sensitivity test. The test results are shown in Table 1: Table 1

[0068] It can be seen that the test error is small, and the air interface test method provided in Example 2 of the present application only takes more than ten minutes to perform an omnidirectional sensitivity test. Using the standard reverberation chamber test method in the prior art (taking 100 stirring states as an example) to perform an omnidirectional sensitivity test takes about 100 minutes. Therefore, the air interface test method provided in the embodiment of the present application can greatly save the time for testing omnidirectional sensitivity.

[0069] The hardware structure of the computing control device provided by the present application is introduced below. In some embodiments, the computing control device can be a desktop, laptop, notebook computer, ultra-mobile personal computer (UMPC), handheld computer, netbook, personal digital assistant (PDA) and other devices. The present application does not impose any special restrictions on the specific form of the above-mentioned wireless devices to be tested. In this embodiment, the structure of the computing control device can be as follows: Figure 7 As shown, Figure 7 A schematic diagram of the structure of a computing control device provided in an embodiment of the present application.

[0070] like Figure 7 As shown, the computing control device may include a processor 710 , a USB interface 720 , an internal memory 730 , a display screen 740 , and the like.

[0071] It is to be understood that the structure illustrated in this embodiment does not constitute a specific limitation on the computing control device. In other embodiments, the computing control device may include more or fewer components than shown in the figure, or combine certain components, or split certain components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0072] The processor 710 may include one or more processing units, for example, the processor 710 may include an application processor (AP), a central processing unit (CPU), a graphics processing unit (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU), etc. Among them, different processing units may be independent devices or integrated in one or more processors, and the air interface test method provided in the embodiment of the present application may be run in the CPU, GPU, and NPU.

[0073] The controller can be the nerve center and command center of the electronic device. The controller can generate operation control signals according to the instruction operation code and timing signal to complete the control of fetching and executing instructions.

[0074] The USB interface 720 is an interface that complies with the USB standard specification, and specifically can be a Mini USB interface, a Micro USB interface, a USB Type C interface, etc. The USB interface 720 can be used to connect a charger to charge the wireless device under test, and can also be used to transmit data between the wireless device under test and communicate with the wireless device under test. It can also be used to connect headphones to play audio through the headphones. The interface can also be used to connect other electronic devices, such as AR devices, etc.

[0075] The internal memory 730 may be used to store executable program codes of the computing control device, wherein the executable program codes include instructions. The processor 710 executes various functional applications and data processing of the computing control device by running the instructions stored in the internal memory 730 .

[0076] The internal memory 730 may include a program storage area and a data storage area. Among them, the program storage area may store an operating system, an application required for at least one function, etc. The data storage area may store data created during the use of the electronic device, etc. In addition, the internal memory 730 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, a universal flash storage (UFS), etc. The processor 710 executes various functional applications and data processing of the computing control device by running instructions stored in the internal memory 730 and / or instructions stored in a memory provided in the processor, such as executing the air interface test method provided in the embodiment of the present application.

[0077] The display screen 740 is used to display images, videos, etc. The display screen 740 includes a display panel. For example, the calculated total omnidirectional sensitivity related data of the wireless device to be tested can be displayed, and the display panel can be a liquid crystal display (LCD), an organic light-emitting diode (OLED), an active-matrix organic light emitting diode or an active-matrix organic light emitting diode (AMOLED), a flexible light-emitting diode (FLED), Miniled, MicroLed, Micro-oled, a quantum dot light emitting diode (QLED), etc. In some embodiments, the computing control device may include 1 or N display screens 740, where N is a positive integer greater than 1.

[0078] A series of graphical user interfaces (GUIs), camera application interfaces, etc. can be displayed on the display screen 740 of the computing control device. These GUIs are the main screen of the computing control device. Generally speaking, the size of the display screen 740 of the computing control device is fixed, and only limited controls can be displayed on the display screen 740 of the computing control device. A control is a GUI element, which is a software component included in an application. It controls all data processed by the application and the interactive operations on these data. Users can interact with the control through operations (direct manipulation) to read or edit relevant information of the application. Generally speaking, controls can include visual interface elements such as icons, controls, menus, tabs, text boxes, dialog boxes, status bars, navigation bars, widgets, etc.

[0079] It is understandable that the interface connection relationship between the modules illustrated in this embodiment is only a schematic illustration and does not constitute a structural limitation on the air interface test system. In other embodiments of the present application, the air interface test system may also adopt different interface connection methods in the above embodiments, or a combination of multiple interface connection methods.

[0080] The technical solution of this embodiment, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) or a processor to execute all or part of the steps of the method described in each embodiment. The aforementioned storage medium includes: flash memory, mobile hard disk, read-only memory, random access memory, magnetic disk or optical disk, etc., various media that can store program codes.

[0081] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An air interface test system, characterized in that: include: Reverberation chambers and RF shielding boxes; The reverberation chamber is used to provide an electromagnetic environment for air interface testing of wireless devices to be tested; The RF shielding box is used to provide an environment without external electromagnetic interference for the air interface test of the wireless device to be tested, so that the computing control device calculates the total omnidirectional sensitivity of the wireless device to be tested based on the ratio of the product of the output power of the wireless device to be tested in the RF shielding box and the RF channel sensitivity to the total radiated power of the wireless device to be tested in the reverberation chamber, and the output power is the output power at the antenna port of the RF front-end circuit of the wireless device to be tested.

2. The system according to claim 1, characterized in that The system also includes a radio frequency channel switching device, a comprehensive tester, a vector network analyzer and a computing control device; The measuring antenna in the reverberation chamber is connected to the RF port of the comprehensive tester through the RF channel switching device; the reference antenna in the reverberation chamber is placed on a turntable in the reverberation chamber and is connected to the RF port of the comprehensive tester through the RF channel switching device; the vector network analyzer is connected to the reference antenna and the measuring antenna through the RF channel switching device, and the vector network analyzer is connected to the computing control device through the LAN port; the RF channel switching device and the comprehensive tester are connected to the computing control device through the LAN port; the RF channel switching device is connected to at least one of the N probe antennas in the RF shielding box.

3. The system according to claim 1 or 2, characterized in that: When it is necessary to measure the total radiated power of the wireless device to be tested in the reverberation chamber, the computing and controlling device is also used to perform two-way communication with the comprehensive tester and the radio frequency channel switching device through the LAN port and to perform two-way communication with the wireless device to be tested placed in the reverberation chamber; Control the reverberation chamber transfer table and the mechanical stirrer to change the stirring state in the reverberation chamber, control the start-up of the vector network analyzer, control the reference antenna, the RF channel switching device, the integrated tester and the wireless device to be tested to form a communication link, and control the measurement antenna, the RF channel switching device, the vector network analyzer and the wireless device to be tested to form a communication link.

4. The system according to claim 1 or 2, characterized in that: When it is necessary to measure the output power and radio frequency channel sensitivity of the wireless device under test in the radio frequency shielding box, the computing and controlling device is also used to control the probe antenna and the wireless device under test to be connected through air interface radiation and to control the probe antenna and the wireless device under test to perform two-way communication; Control the wireless device to be tested, the RF channel switching device and the integrated tester to form an uplink RF link and a downlink RF link, and control the integrated tester and the RF channel switching device to perform two-way communication with the computing control device through the LAN port.

5. The system according to claim 1, characterized in that The total omnidirectional sensitivity is calculated according to the ratio of the product of the output power and the RF channel sensitivity to the total radiated power: ； Where P0 is the output power at the antenna port of the RF front-end circuit of the wireless device under test, P s is the RF channel sensitivity, P TIS is the total omnidirectional sensitivity, P TRP is the total radiated power.

6. The system according to claim 1, characterized in that The computing control device is also used to control the power interface of the radio frequency channel switching device to be connected to the power interface of the reverberation chamber; or, The power interface of the radio frequency channel switching device is controlled to be connected with the power interface of the radio frequency shielding box.

7. An air interface testing method, characterized in that: Applied to computing and control equipment, including: Obtaining the output power of the wireless device under test in the radio frequency shielding box, the radio frequency channel sensitivity, and the total radiation power of the wireless device under test in the reverberation chamber, wherein the output power is the output power at the antenna port of the radio frequency front-end circuit of the wireless device under test; The total omnidirectional sensitivity of the wireless device to be tested is calculated according to the ratio of the product of the output power and the radio frequency channel sensitivity to the total radiated power of the wireless device to be tested in the reverberation chamber.

8. The method according to claim 7, characterized in that The formula for calculating the total omnidirectional sensitivity based on the ratio of the product of the output power and the RF channel sensitivity to the total radiated power is: ； Where P0 is the output power at the antenna port of the RF front-end circuit of the wireless device under test, P s is the RF channel sensitivity, P TIS is the total omnidirectional sensitivity, P TRP is the total radiated power.

9. The method according to claim 7 or 8, characterized in that: When it is necessary to measure the total radiation power of the wireless device to be tested in the reverberation chamber, the method further includes: Control the reverberation chamber transfer table and the mechanical stirrer to change the stirring state in the reverberation chamber, control the start-up of the vector network analyzer, control the reference antenna, the RF channel switching device, the integrated tester and the wireless device to be tested to form a communication link, and control the measurement antenna, the RF channel switching device, the vector network analyzer and the wireless device to be tested to form a communication link.

10. The method according to claim 7 or 8, characterized in that: When it is necessary to measure the output power and radio frequency channel sensitivity of the wireless device to be tested in the radio frequency shielding box, the method further includes: The probe antenna in the radio frequency shielding box is controlled to be connected with the wireless device to be tested through air interface radiation, and the probe antenna and the wireless device to be tested are controlled to perform two-way communication; the wireless device to be tested, the radio frequency channel switching device and the comprehensive tester are controlled to form an uplink radio frequency link and a downlink radio frequency link, and the comprehensive tester and the radio frequency channel switching device are controlled to perform two-way communication with the computing control device through the LAN port.

11. The method according to claim 7, characterized in that The method further comprises: Control the power interface of the RF channel switching device to be connected to the power interface of the reverberation chamber; or, The power interface of the radio frequency channel switching device is connected to the power interface of the radio frequency shielding box.

12. A computing control device, characterized in that: include: Processor and memory; Wherein, one or more computer programs are stored in the memory, and the one or more computer programs include instructions; when the instructions are executed by the processor, the computing control device performs the method as described in any one of claims 7-11.

13. A computer storage medium, characterized in that: The method comprises computer instructions, and when the computer instructions are executed on a computer control device, the computer control device executes the method as described in any one of claims 7 to 11.

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