WO2012129869A1

WO2012129869A1 - System and method for testing receiving sensitivity of data terminal

Info

Publication number: WO2012129869A1
Application number: PCT/CN2011/077536
Authority: WO
Inventors: 陈霖; 禹忠; 郭阳; 支周
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-03-28
Filing date: 2011-07-25
Publication date: 2012-10-04
Also published as: CN102710340A

Abstract

Disclosed is a system for testing the receiving sensitivity of a data terminal, and the system comprises: a microwave anechoic chamber, a control device for testing, and a data terminal under test. The system further comprises a universal serial bus (USB) cable. The control device for testing is placed on the floor of the microwave anechoic chamber, covered by a microwave absorbing material, and configured to supply power to the data terminal under test and control the working state and mode of the data terminal under test. The USB cable is a shielded metal-core cable, and configured to connect the control device for testing and the data terminal under test. The data terminal under test is configured to undergo total isotropic sensitivity (TIS) measurement. Further disclosed is a method for testing the receiving sensitivity of a data terminal. By using the present invention, the influence on a test result by the control device for testing can be avoided, so that obtained test results are reliable, and further, performances of data terminals of different types can be compared fairly and effectively by using the test results.

Description

Test system and method for receiving sensitivity of data terminal

The present invention relates to a test and performance evaluation technique for a wireless communication product, and more particularly to a test system and method for receiving sensitivity of a data terminal. Background technique

With the rapid development of radio technologies, there are more and more types of wireless communication products, including: voice and data wireless handheld terminals, and notebook computers with various built-in or external wireless connection devices. Good reception performance is the key to ensuring the communication quality of various wireless communication products. Therefore, space RF performance testing is required and the performance of wireless communication products is measured by performance test indicators. Among them, the total isotropic receiving sensitivity (TIS, Total Isotropic Sensitivity) is the most important indicator reflecting the performance of the actual received signal of the DUT (Device Under testing) in the radio frequency test (OTA, Over The Air). one. In order to ensure that the DUT can meet the performance requirements at work, the TIS value of the DUT must be lower than the specified threshold.

At present, a number of standards organizations around the world have conducted in-depth research on OTA testing and developed corresponding standards. For example: the United States Wireless Communications and Internet Association (CTIA), Worldwide Interoperability for Microwave Access, 3GPP, the 3rd Generation Partnership Project, and the China Communications Standards Tenth Conference ( CCSA, China Communications Standards Association) standards. Among the established standards, the OTA test methods and standards for single-input single-output (SISO) single-antenna handheld wireless communication products such as mobile terminals have been improved. However, OTA test methods and standards for data terminals such as data cards are still blank.

In summary, there is currently no technical solution for the OTA test method of the data terminal. Summary of the invention

In view of this, the main object of the present invention is to provide a test system and method for receiving sensitivity of a data terminal, which can obtain accurate and reliable test results, and can compare the performance of different types of data terminals fairly and effectively.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

The invention provides a test system for receiving sensitivity of a data terminal, comprising: a silencer microwave darkroom, a test control device, and a data terminal to be tested, the system further comprising: a universal serial bus (USB) cable; among them,

The test control device is placed on the ground of the muffler microwave darkroom and covered by the absorbing material for powering the data terminal to be tested, and controlling the working state and mode of the data terminal under test;

USB cable, a metal core shielded cable for connecting the test control device to the data terminal under test;

The data terminal to be tested is used for TIS measurement.

In the above solution, the length of the USB cable is less than 3 meters.

In the above solution, the USB cable is surrounded by a absorbing foam.

In the above solution, the data terminal to be tested is fixed on a bracket in the center of the turntable in the muffler microwave darkroom.

The invention also provides a test method for receiving sensitivity of a data terminal, the method comprising: placing the test control device on the ground of the muffler microwave darkroom and covering with the absorbing material; connecting the test control device with the USB cable Measuring data terminal; wherein the USB cable is a metal core shielded cable;

The test control device supplies power to the data terminal under test through the USB cable, and controls the working state and mode of the data terminal under test, and then performs TIS measurement.

The invention provides a test system and method for receiving sensitivity of a data terminal, and the test control device is placed on the ground of the muffler microwave darkroom and covered by the absorbing material; Connect the test control device to the measured data terminal for TIS measurement. In this way, when the TIS measurement is performed, the test control device can be prevented from affecting the test result, so that the obtained test result is accurate and reliable, and the test result can be used to compare the performance of different types of data terminals fairly and effectively.

In addition, the USB cable of the present invention uses a metal core shielded cable to prevent external clutter signals from interfering with the test results. In the present invention, the absorbing foam is surrounded by the USB cable, so that the USB cable can be further prevented from being silenced. Test the interference of the environment to further ensure the reliability of the test results. DRAWINGS

1 is a schematic structural diagram of a test system for receiving sensitivity of a data terminal according to the present invention;

2 is a schematic flow chart of a test method for receiving sensitivity of a data terminal according to the present invention;

Fig. 3 is a schematic diagram of a spherical coordinate system in the conventional TIS measurement. detailed description

The present invention will be further described in detail below with reference to the accompanying drawings.

The test system for receiving sensitivity of the data terminal provided by the present invention, as shown in FIG. 1, the system includes: a silencer darkroom 11, a test control device 12, a USB cable 13, and a measured data terminal 14;

The muffler microwave darkroom 11 is provided with a vector network analyzer, a spectrum analyzer, a comprehensive tester, a base station simulator, and a turntable, etc., to provide an environment for the TIS measurement of the data terminal 14 to be tested; the test control device 12, placed On the ground of the anechoic microwave darkroom 11, and covered by the absorbing material 15, for supplying power to the data terminal 14 under test, and controlling the working state and mode of the data terminal 14 under test; here, the test control device 12 can be used laptop;

The USB cable 13 is a metal core shielded cable for connecting the test control device 12 and the data terminal 14 to be tested; The data terminal 14 to be tested is fixed to the holder 16 at the center of the turntable for TIS measurement. Here, the configuration of the muffler microwave darkroom 11 is exactly the same as that of the muffler microwave darkroom of the existing TIS measuring system, and will not be described again here. The absorbing material 15 may be any one of the existing absorbing materials.

The usage scenarios of the data terminal, such as a data card, and a handheld wireless terminal, such as a mobile phone terminal, are quite different: First, the data card needs to be connected to the laptop through a data interface, thereby providing a wireless access function for the notebook computer; second, the notebook The computer is composed of a mixture of metal and dielectric materials. Since the notebook computer is located in the near field region of the antenna of the data card, it has a large influence on the radiation pattern, transmission power, and TIS of the data card antenna; and, for different types. The size and material composition of the notebook computer are different. Correspondingly, the radiation pattern of the antenna of the data card and the influence of the TIS are also different. Third, the motherboard of the notebook computer contains a large number of high-speed integrated circuits. The operating frequency of the high-speed integrated circuit is very close to the electromagnetic wave frequency radiated by the antenna of the data card. This background electromagnetic noise has a great influence on the TIS of the data card.

For the above reasons, the configuration relationship between the data card and the notebook computer, such as the data card connected to a different USB port, or the relative position of the data card directly to the notebook computer, will affect the test result of the data card. Therefore, compared with handheld wireless terminals, data terminals are subject to more external factors, making their TIS test results very sensitive to the test environment, which will result in poor repeatability of test results; Since the impact of the same type of laptop on different data cards may also be different, it is difficult to effectively compare the performance of different data cards from the TIS test results. Through the above analysis, in practical applications, the data terminal 14 to be tested is connected to the test control device 12 such as a notebook computer through a USB cable, so that the data terminal 14 to be tested can be moved away from the test control device 12, thereby avoiding testing as much as possible. The control device 12 has an influence on the test result of the data terminal 14 to be tested.

When the signal is transmitted, the USB cable 13 will attenuate the signal strength, plus The height of the existing turntable is generally 1.3 to 1.5 meters, so it is recommended that the length of the USB cable 13 be less than 3 meters. Moreover, in order to prevent the USB cable 13 from affecting the test environment, thereby affecting the test result, the absorbing foam 17 may be further surrounded around the USB cable 13, wherein the absorbing foam 17 may be any of the existing absorbing foams. One.

The metal core shielded cable as the USB cable 13 can be any of the existing metal core shielded cables. It has been experimentally proven that a tin foil shielded cable is recommended, thus ensuring the reliability of the test results.

The data terminal to be tested 14, fixed in the center of the turntable, can be fixed in various TIS measurement systems.

Based on the above system, the present invention also provides a test method for receiving sensitivity of a data terminal. As shown in FIG. 2, the method includes the following steps:

Step 201: placing the test control device on the ground of the muffler microwave darkroom and covering with the absorbing material; connecting the test control device and the data terminal to be tested through the USB cable; wherein the USB cable is a metal core shielded cable;

The test control device may be a notebook computer; the data terminal to be tested is fixed on a bracket in the center of the turntable.

Step 202: The test control device supplies power to the data terminal to be tested through the USB cable, and controls the working state and mode of the data terminal under test, and then performs TIS measurement.

Here, the controlling the working state and mode of the data terminal under test means that: the test control device controls the data terminal to be tested to enter a working state, and the specific processing procedure can adopt an existing processing procedure.

When performing TIS measurement, the data terminal can make a call through the AT command, establish a wireless call connection with the base station simulator, and perform TIS measurement. Among them, the specific processing of TIS measurement can be processed by the existing TIS measurement.

When measuring, the existing common AT commands are as follows:

At + cfun = 5 , indicating activation of the SIM card; At + cfun = 1 , indicates that the network is registered. After the base station emulator returns OK, it waits for about 10 seconds, and then reports the network status to the base station simulator. If the report is creg: 1 , it indicates that it has been registered to the network and is a local user. If the report is creg: 5, it indicates that it has been registered to the network and is roaming.

At + csg, indicating the strength of the detected signal.

The TIS measurement is performed on the spherical surface centered on the device under test. The spherical coordinate system is shown in Figure 3. The device under test is placed on the first rotating shaft or the second rotating shaft, that is, in the center of the turntable, the first rotating shaft is the Z axis, and the rotating range of the first rotating shaft is 0-180 degrees, which is indicated by Θ A rotation angle of a rotation axis, the second rotation axis is an X axis, and the second rotation axis has a rotation range of 0-360 degrees, and a rotation angle indicating the second rotation axis is used.

In the measurement, a test point is taken for each of the lengths of <9 and φ at 0-180 degrees and 0-360 degrees, respectively. Since the test points are selected by the equal space angle, they are non-uniformly distributed on the spherical surface. . Calculate the signal strength of all test points according to the formula:

TIS value.

Where Ϊ and m represent the total number of test points in * and direction, respectively, determined by the number of step lengths taken; represent a particular test point, the number of the test points in the * and direction are i and j, respectively

. ) respectively represent the components of the effective direct receiving sensitivity measured in the Θ direction and the φ direction measured at the test point; N _£ represents a fixed coefficient obtained by simplifying the sphere area division operation. Here, for (9=0, and (9=180, two test points, since their sine values are zero, no measurement is made for these two points.

When testing the data terminal, the same method and calculation method as the existing TIS measurement are used. During the measurement, the detected signal strength of each point is recorded and transferred to the next detection point. * After all the detection points in the direction and the signal strength are tested, follow the above The formula is calculated to obtain the TIS value of the terminal of the data to be tested.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

Claim

A test system for receiving sensitivity of a data terminal, comprising: a silencer microwave darkroom, a test control device, and a data terminal to be tested, wherein the system further comprises: a universal serial bus (USB) cable;

The data terminal under test is used for total isotropic receive sensitivity (TIS) measurements.

2. The system of claim 1 wherein the length of the USB cable is less than 3 meters.

3. System according to claim 1 or 2, characterized in that the USB cable is surrounded by a absorbing foam.

The system according to claim 1 or 2, wherein the data terminal to be tested is fixed to a bracket in the center of the turntable in the muffler microwave darkroom.

A test method for receiving sensitivity of a data terminal, the method comprising: placing a test control device on a ground of a muffler microwave darkroom and covering with a absorbing material; and connecting the test control device with a USB cable a data terminal to be tested; wherein the USB cable is a metal core shielded cable;

6. The method of claim 5 wherein the length of the USB cable is less than 3 meters.

7. Method according to claim 5 or 6, characterized in that the USB cable is surrounded by a absorbing foam.

The method according to claim 5 or 6, wherein the data terminal to be tested is fixed to a bracket at the center of the turntable in the muffler microwave darkroom.