CN107809289B - Wireless terminal performance test method and device - Google Patents
Wireless terminal performance test method and device Download PDFInfo
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- CN107809289B CN107809289B CN201711051077.1A CN201711051077A CN107809289B CN 107809289 B CN107809289 B CN 107809289B CN 201711051077 A CN201711051077 A CN 201711051077A CN 107809289 B CN107809289 B CN 107809289B
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Abstract
The invention provides a method and a device for testing the performance of a wireless terminal. The method realizes the performance test of the LTE-V2X terminal in the anechoic chamber environment. Firstly, a test system is built, wherein the test system comprises an anechoic chamber, and a first test device, a sending end, a channel simulator, an adjustable attenuator, a receiving end and a second test device which are sequentially connected along the signal transmission direction and are positioned in the anechoic chamber. When the signal propagation path loss value under the scene cannot reach the signal propagation path loss value required by the scene, the actual signal propagation path loss value under the scene is simulated through the sum of the signal propagation path loss value of the channel simulator and the attenuation value of the adjustable attenuator, the simulated path loss range is expanded, and the problem that the channel simulator cannot simulate the signal propagation path loss under all scenes when performance tests are carried out in a laboratory is solved.
Description
Technical Field
The invention relates to the technical field of wireless communication, in particular to a method and a device for testing the performance of a wireless terminal.
Background
In the beginning of the 21 st century, automobile technology and radio technology show a trend of mutual fusion, and the information interaction fusion among vehicles, pedestrians and road side infrastructure is realized by the proposal of an ITS (Intelligent Transportation System). With the popularization of the LTE (Long Term Evolution), especially the formulation of the LTE-D2D (Long-Term Evolution Device-to-Device, a communication service that supports communication between devices in an LTE cellular system), it becomes possible to realize direct communication between cars, lanes, and passengers based on the LTE technology, thereby meeting the requirements of low latency and high reliability communication between cars, lanes, and passengers. LTE-V2X (Long-Term Evolution Vehicle-to-Evolution, a communication service including a sender or a receiver supporting internet of vehicles applications) is a core communication network of ITS, which is essentially an end-to-end wireless communication means in ITS system, and can bi-directionally transfer any possible message, playing a role of a core information channel in the internet of vehicles. V2X is composed of three vehicle communication services, respectively: V2V (Vehicle to Vehicle), V2I (Vehicle to Infrastructure, Vehicle and roadside unit), V2P (Vehicle to peer, Vehicle and human). The V2X system is also intensively studied by the major international developed countries and major organizations on communication standards. ITU-R (International Telecommunication Union Radio communications sector) has determined the worldwide Union research frequency band of ITS to be 5850MHz-5925MHz, and the U.S., European Union, and Singapore ITS communication bands are consistent with IUT-R.
Currently, the mainstream wireless Communication technologies in ITS include DSRC (Dedicated Short Range Communication) and LTE-V2X, wherein the DSRC technology has been developed and matured in the united states for decades.
The DSRC terminal performance test method of the ITS system comprises the following steps: the testing environment is set as an external field test, the communication performance of the LTE-V2X communication system is tested under different communication conditions by setting different scene parameters including transmission power, communication bandwidth, relative speed, modulation mode and the like, finally, basic communication performance parameters of the LTE-V2X communication system under an ideal condition are obtained, and the communication performance of the LTE-V2X communication system is evaluated. In addition, the general test method of the performance of other mobile communication terminals is as follows: establishing a communication link in a laboratory, configuring parameters of the tested equipment, setting a channel simulator to simulate the actual communication channel environment of the tested equipment, analyzing the communication data log of the tested equipment by using the testing equipment, and finally obtaining the communication performance of the tested equipment through analysis.
However, the DSRC terminal performance test is set as an external field test, and different parameters need to be set according to different scenes in the actual test process, including the signal path LOSs model and the corresponding path LOSs value under the conditions that the OBU (On Board Unit) and the RSU (Road Side Unit) move at different relative speeds in various scenes, the urban area and the high-speed scene, and the LOS (Line Of Sight) and the NLOS (Not Line Of Sight). Due to the fact that the number of scenes is large, the combination is complex, a large amount of manpower and test time cost are needed for achieving all external field performance tests, and potential safety hazards exist when the vehicle-mounted terminal moves at a high speed in certain scenes. Meanwhile, in an actual external field test scene, interference signals possibly interfere the performance of the receiver, and the effectiveness and accuracy of the performance test are influenced. In addition, because the channel simulator limits the range of the simulated signal propagation path loss, the existing general laboratory performance test method of the mobile communication terminal cannot simulate the channel environment when the signal propagation path loss value is large, and cannot realize complete simulation of the actual communication channel environment.
Therefore, how to realize the simulation of the signal propagation path loss in all scenes and realize efficient, accurate and safe performance test becomes a technical problem to be solved urgently.
Disclosure of Invention
In view of the above, the present invention has been made to provide a wireless terminal performance testing method and apparatus that overcomes or at least partially solves the above-mentioned problems.
According to an aspect of the embodiments of the present invention, a method for testing performance of a wireless terminal is provided, including:
the method comprises the steps of setting up a wireless terminal performance test system, wherein the system comprises an anechoic chamber, and first test equipment, a sending end, a channel simulator, an adjustable attenuator, a receiving end and second test equipment which are sequentially connected along a signal transmission direction and are positioned in the anechoic chamber;
when the performance of the wireless terminal is tested, determining a corresponding channel model according to a scene to be tested, and determining a signal propagation path loss value under the scene according to the channel model;
judging whether the determined signal propagation path loss value under the scene is larger than the upper limit value of the signal propagation path loss which can be simulated by the channel simulator;
if not, setting configuration parameters of the channel simulator, and simulating the actual signal propagation path loss under the scene through the channel simulator, wherein the configuration parameters of the channel simulator at least comprise a signal propagation path loss value;
if yes, setting configuration parameters of the channel simulator, setting an attenuation value of the adjustable attenuator, and simulating actual signal propagation path loss under the scene through the channel simulator and the adjustable attenuator, wherein the sum of the set signal propagation path loss value of the channel simulator and the set attenuation value of the adjustable attenuator is equal to the determined signal propagation path loss under the scene;
the first test equipment generates sending data, controls the sending end to send the sending data and records a sending log;
receiving, by the receiving end, the transmission data transmitted through the corresponding communication link to obtain reception data, and transmitting the reception data to the second test device;
adding, by the second test device, the received data to the transmitted data and recording a received log;
and processing the sending log and the receiving log to obtain the system performance of a communication link between the sending end and the receiving end.
Optionally, the wireless terminal performance test includes a performance test of an LTE-V2X terminal in a anechoic environment, the transmitting end includes an LTE-V2X terminal, and the receiving end includes an LTE-V2X terminal.
Optionally, the transmitting end includes an OBU vehicle-mounted unit and/or an RSU road-side unit, and the receiving end includes an OBU vehicle-mounted unit and/or an RSU road-side unit.
Optionally, the configuration parameters of the channel simulator further include at least one of:
the method comprises the following steps of a channel model, a communication distance, relative motion speed of a sending end and a receiving end and signal to noise ratio.
Optionally, the system performance includes a packet loss rate and/or a time delay.
Optionally, the method further comprises:
before the performance test of the wireless terminal is carried out, the sending end, the receiving end, the first test equipment and the second test equipment are synchronously calibrated based on a GPS signal introduced into the anechoic chamber.
According to another aspect of the embodiments of the present invention, there is also provided a wireless terminal performance testing apparatus, including:
the system comprises an electric wave darkroom, and a first test device, a sending end, a channel simulator, an adjustable attenuator, a receiving end and a second test device which are sequentially connected along the signal transmission direction and are positioned in the electric wave darkroom;
the device comprises a determining module, a judging module and a judging module, wherein the determining module is suitable for determining a corresponding channel model according to a scene to be tested when the wireless terminal performance is tested, and determining a signal propagation path loss value under the scene according to the channel model;
the judging module is suitable for judging whether the signal propagation path loss value under the determined scene is larger than the upper limit value of the signal propagation path loss which can be simulated by the channel simulator or not to obtain a judging result;
a setting module adapted to:
if the judgment result is negative, setting configuration parameters of the channel simulator, and simulating the actual signal propagation path loss under the scene through the channel simulator, wherein the configuration parameters of the channel simulator at least comprise a signal propagation path loss value;
if the judgment result is yes, setting configuration parameters of the channel simulator, setting an attenuation value of the adjustable attenuator, and simulating actual signal propagation path loss under the scene through the channel simulator and the adjustable attenuator, wherein the sum of the set signal propagation path loss value of the channel simulator and the set attenuation value of the adjustable attenuator is equal to the determined signal propagation path loss under the scene; and
a performance testing module adapted to:
the first test equipment generates sending data, controls the sending end to send the sending data and records a sending log;
receiving, by the receiving end, the transmission data transmitted through the corresponding communication link to obtain reception data, and transmitting the reception data to the second test device;
adding, by the second test device, the received data to the transmitted data and recording a received log;
and processing the sending log and the receiving log to obtain the system performance of a communication link between the sending end and the receiving end.
Optionally, the wireless terminal performance test includes a performance test of an LTE-V2X terminal in a anechoic environment, the transmitting end includes an LTE-V2X terminal, and the receiving end includes an LTE-V2X terminal.
Optionally, the transmitting end includes an OBU vehicle-mounted unit and/or an RSU road-side unit, and the receiving end includes an OBU vehicle-mounted unit and/or an RSU road-side unit.
Optionally, the configuration parameters of the channel simulator further include at least one of:
the method comprises the following steps of a channel model, a communication distance, relative motion speed of a sending end and a receiving end and signal to noise ratio.
Optionally, the system performance includes a packet loss rate and/or a time delay.
Optionally, the apparatus further comprises:
and the synchronous calibration module is suitable for synchronously calibrating the transmitting end, the receiving end, the first test equipment and the second test equipment based on a GPS (global positioning system) signal introduced into the anechoic chamber before the performance test of the wireless terminal is carried out.
The method and the device for testing the performance of the wireless terminal, provided by the embodiment of the invention, can be used for testing the performance of the LTE-V2X terminal in an anechoic chamber environment. Firstly, a test system comprising an anechoic chamber, and a first test device, a sending end, a channel simulator, an adjustable attenuator, a receiving end and a second test device which are sequentially connected along a signal transmission direction and are positioned in the anechoic chamber is built. When testing is carried out, a signal propagation path loss value under the scene is determined according to channel models corresponding to different scenes, and when the determined signal propagation path loss value under the scene is judged to be larger than the upper limit value of the signal propagation path loss which can be simulated by the channel simulator, the actual signal propagation path loss value under the scene is simulated through the sum of the signal propagation path loss value set by the channel simulator and the attenuation value set by the adjustable attenuator. In other words, under the condition that the signal propagation path loss limit value which can be simulated by the channel simulator cannot meet the requirements of an actual scene, the signal propagation path loss is supplemented through the adjustable attenuator, the simulation path loss range is increased, and the problem that the channel simulator cannot simulate the signal propagation path loss in all scenes when performance tests are carried out in a laboratory is solved. Secondly, aiming at the problems that a large amount of time, labor, material resources and other test costs are consumed in the external field performance test, and the test result reproducibility is poor, the scheme is used for testing in an anechoic chamber, so that the test time is effectively shortened, and the test accuracy and the reproducibility are improved. In addition, the test is carried out in an anechoic chamber, the channel environment is clean, the problem that the external field test result is influenced by a communication environment interference signal is solved, and the accuracy of the test result is improved; meanwhile, the danger caused by the fact that the relative speed of the OBU and the RSU is high in different scenes in the external field performance test is effectively reduced, the safe test is guaranteed, and efficient, accurate and safe test is finally achieved.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 shows a flow chart of a wireless terminal performance testing method according to an embodiment of the invention;
FIG. 2 shows a schematic diagram of a wireless terminal performance testing system according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a system for testing the performance of an LTE-V2X terminal in an anechoic chamber environment according to an embodiment of the present invention; and
fig. 4 is a schematic structural diagram of a wireless terminal performance testing apparatus according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In the prior art, an ITS terminal external field performance test method comprises the steps of firstly collecting basic environment data and measuring an environment noise level; according to a preset scheme, configuration is carried out according to related parameter requirements in different scenes, the basic performance of ITS terminal equipment in different scenes is measured, and finally measurement data are analyzed. In addition, the laboratory performance test method is used for testing the time delay and the packet loss rate of the communication link to be tested when the basic performance is measured. Specifically, a test environment is set up; setting parameters of a test system and a tested system; determining corresponding signal propagation path loss values according to different scene channel models; setting a channel simulator; and carrying out statistical analysis on the test data log through the test system to obtain the time delay and the packet loss rate.
The inventors have found that the existing performance testing techniques have the following significant disadvantages: first, in the laboratory performance test method, since the channel simulator defines a signal propagation path loss limit value that can be simulated, it is impossible to simulate a path loss value in different scenes. Secondly, in the outfield performance test method, repeated tests need to be carried out in different scenes, a large amount of test cost such as time, manpower, material resources and the like is consumed, the test result reproducibility is poor, and data analysis is difficult to carry out; also, there may be interference signals that affect the performance of the communication link; meanwhile, the requirements on the relative moving speed of the OBU and the RSU are different in different scenes, and the relative speed is high in certain scenes, so that potential safety hazards exist.
To solve the above technical problem, an embodiment of the present invention provides a method for testing performance of a wireless terminal, and fig. 1 shows a flowchart of the method for testing performance of a wireless terminal according to an embodiment of the present invention. Referring to fig. 1, the wireless terminal performance testing method may include the following steps S102 to S112.
And S102, building a wireless terminal performance test system, wherein the test system comprises an anechoic chamber, and a first test device, a sending end, a channel simulator, an adjustable attenuator, a receiving end and a second test device which are sequentially connected along the signal transmission direction in the anechoic chamber.
And step S104, when the wireless terminal performance is tested, determining a corresponding channel model according to a scene to be tested, and determining a signal propagation path loss value under the scene according to the channel model.
And step S106, judging whether the determined signal propagation path loss value under the scene is larger than the upper limit value of the signal propagation path loss which can be simulated by the channel simulator.
And step S108, if not, setting configuration parameters of the channel simulator, and simulating the actual signal propagation path loss under the scene through the channel simulator, wherein the configuration parameters of the channel simulator at least comprise a signal propagation path loss value.
Step S110, if yes, setting configuration parameters of the channel simulator, setting an attenuation value of the adjustable attenuator, and simulating an actual signal propagation path loss in the scene through the channel simulator and the adjustable attenuator, where a sum of the set signal propagation path loss value of the channel simulator and the set attenuation value of the adjustable attenuator is equal to the determined signal propagation path loss value in the scene.
Step S112, the first test equipment generates sending data, controls the sending end to send the sending data and records a sending log; receiving, by the receiving end, the transmission data transmitted through the corresponding communication link to obtain reception data, and transmitting the reception data to the second test device; adding the received data to the transmitted data by the second test equipment, and recording a receiving log; and processing the sending log and the receiving log to obtain the system performance of a communication link between the sending end and the receiving end.
The method for testing the performance of the wireless terminal provided by the embodiment of the invention realizes the performance test of the LTE-V2X terminal in a anechoic chamber environment. Firstly, a test system is built, wherein the test system comprises an anechoic chamber, and a first test device, a sending end, a channel simulator, an adjustable attenuator, a receiving end and a second test device which are sequentially connected along the signal transmission direction and are positioned in the anechoic chamber. When testing is carried out, a signal propagation path loss value under the scene is determined according to the channel models corresponding to different scenes, and when the determined signal propagation path loss value under the scene is judged to be larger than the upper limit value of the signal propagation path loss which can be simulated by the channel simulator, the actual signal propagation path loss value under the scene is simulated through the sum of the signal propagation path loss value set by the channel simulator and the attenuation value set by the adjustable attenuator. In other words, under the condition that the signal propagation path loss limit value which can be simulated by the channel simulator cannot meet the requirements of an actual scene, the signal propagation path loss is supplemented through the adjustable attenuator, the simulation path loss range is increased, and the problem that the channel simulator cannot simulate the signal propagation path loss in all scenes when performance tests are carried out in a laboratory is solved. Secondly, aiming at the problems that a large amount of time, labor, material resources and other test costs are consumed in the external field performance test, and the test result reproducibility is poor, the scheme is used for testing in an anechoic chamber, so that the test time is effectively shortened, and the test accuracy and the reproducibility are improved. In addition, the test is carried out in an anechoic chamber, the channel environment is clean, the problem that the external field test result is influenced by a communication environment interference signal is solved, and the accuracy of the test result is improved; meanwhile, the danger caused by the fact that the relative speed of the OBU and the RSU is high in different scenes in the external field performance test is effectively reduced, the safe test is guaranteed, and efficient, accurate and safe test is finally achieved.
The wireless terminal performance test system set up in step S102 above and the established communication links between the devices are shown in fig. 2. In fig. 2, the wireless terminal performance testing system may include an anechoic chamber, and a first testing device, a transmitting terminal, a channel simulator, an adjustable attenuator, a receiving terminal, and a second testing device sequentially connected along a signal transmission direction in the anechoic chamber.
In an optional scheme, the transmitting end and the receiving end can be further respectively placed in two shielding boxes, the shielding boxes can effectively absorb the radiation electromagnetic energy inside the transmitting end, meanwhile, external radiation interference signals of the receiving end are shielded, and the accuracy of the test is improved.
After the wireless terminal performance test system is built, corresponding configuration parameter setting is performed on the tested equipment (namely, the transmitting terminal and the receiving terminal), including setting of communication channels, communication bandwidths, transmission powers and the like of the transmitting terminal and the receiving terminal.
In an alternative embodiment of the present invention, the above-mentioned wireless terminal performance test includes a performance test of an LTE-V2X terminal in a anechoic environment, the transmitting end may include an LTE-V2X terminal, and the receiving end may include an LTE-V2X terminal. Further, the transmitting end may include an OBU vehicle-mounted unit and/or an RSU road-side unit, and the receiving end may include an OBU vehicle-mounted unit and/or an RSU road-side unit, which is not limited in this embodiment of the present invention.
In step S104, a corresponding channel model is determined according to a scene to be tested, and a signal propagation path loss value in the scene is determined according to the channel model. In actual wireless communication, signal propagation path loss values are different under different scenes. In order to simulate the actual signal propagation path loss of communication between a sending end and a receiving end in the performance test of the wireless terminal, a corresponding channel model is determined according to different test scenes, and then a signal propagation path loss value under the scene is determined according to the channel model. Taking a communication scene of the OBU vehicle-mounted unit and the OBU vehicle-mounted unit in a traffic congestion section in a city as an example, determining the corresponding channel model according to the scene can be a cascaded Nakagami fading channel model. Taking the communication scene of the OBU vehicle-mounted unit and the OBU vehicle-mounted unit in the suburb high-speed environment as an example, the corresponding channel model may be a dual-selection fading channel model. It should be noted that the above list is only illustrative, and during the testing process, the corresponding channel model may be selected according to actual requirements. And then, according to the channel models corresponding to different scenes, determining the signal propagation path loss value in the scene. The step of determining the signal propagation path loss value may be performed according to a path loss model in an existing wireless terminal test standard, which is not limited by the present invention.
In the above step S106, whether the signal propagation path loss value in the scene determined in step S104 is greater than the upper limit of the signal propagation path loss that can be simulated by the channel simulator is determined by comparison, and if the determination result is no, step S108 is performed; if the determination result is yes, the process proceeds to step S110.
In step S108, if the signal propagation path loss value in the scene determined in step S104 is not greater than the upper limit of the signal propagation path loss that can be simulated by the channel simulator, the configuration parameters of the channel simulator are set so that the actual signal propagation path loss in the scene can be simulated only by the channel simulator, where the configuration parameters of the channel simulator at least include the signal propagation path loss value.
In step S110, if the signal propagation path loss value in the scene determined in step S104 is greater than the upper limit value of the signal propagation path loss that can be simulated by the channel simulator, the configuration parameters of the channel simulator and the attenuation value of the adjustable attenuator are set, and the actual signal propagation path loss in the scene is simulated by the sum of the signal propagation path loss value of the channel simulator and the attenuation value of the adjustable attenuator. In practical applications, the signal propagation path loss value of the channel simulator may be set to the upper limit of the signal propagation path loss that can be simulated by the channel simulator, and then the attenuation value of the adjustable attenuator may be set, so that the sum of the set signal propagation path loss value of the channel simulator and the attenuation value of the adjustable attenuator is equal to the signal propagation path loss value in the scene determined in step S104. Of course, the combination of the channel simulator and the adjustable attenuator may be set in other manners as long as the sum of the set signal propagation path loss value of the channel simulator and the attenuation value of the adjustable attenuator is equal to the signal propagation path loss value in the scene determined in step S104, which is not limited by the present invention. Under the condition that the signal propagation path loss limit value which can be simulated by the channel simulator can not meet the requirement of an actual scene, the signal propagation path loss is supplemented through the adjustable attenuator, the simulation path loss range is increased, and the complete simulation of the actual communication channel environment when the signal propagation path loss is large is realized.
In an alternative embodiment of the present invention, the configuration parameters of the channel simulator may further comprise at least one of: the method comprises the following steps of a channel model, a communication distance, relative motion speed of a sending end and a receiving end and signal to noise ratio. The configuration parameters are set according to actual requirements of different scenes, so that the actual communication channel environment is simulated more truly, and the test accuracy and accuracy are improved. Particularly, the real channel of a signal propagation path under the high-speed running of the vehicle is simulated by setting the relative movement speed of the transmitting end and the receiving end in the channel simulator, so that the potential safety hazard caused by the high-speed running of the vehicle in the test of the performance of the external field is reduced.
In the above step S112, the first test apparatus generates transmission data, controls the transmission end to transmit the data, and records a transmission log. In practical applications, the first test device generates the transmission data according to a prescribed transmission data structure to facilitate transmission and processing of the data. The initial packet sending time of the sending end is a random value within [0ms,100ms ], the data communication time is not less than 200s, and the test effectiveness is ensured.
Then, the receiving end receives the sending data transmitted through the corresponding communication link to obtain receiving data, and transmits the receiving data to the second testing device. Specifically, when the signal propagation path loss value in the scene determined in step S104 is greater than the upper limit value of the signal propagation path loss that can be simulated by the channel simulator, the transmission data reaches the receiving end through the communication path formed by the transmitting end, the channel simulator, the adjustable attenuator, and the receiving end, otherwise, the transmission data reaches the receiving end through the communication path formed by the transmitting end, the channel simulator, and the receiving end.
Then, the second test equipment adds the received data to the sent data and records a received log; finally, the first testing device or the second testing device may process the sending log and the receiving log to obtain the system performance of the communication link between the sending end and the receiving end, where the system performance may include a packet loss rate and/or a time delay, which is not limited in the present invention.
Further, the embodiment of the present invention may repeat the above steps S102 to S112 to complete the performance test of the wireless terminal in different scenarios.
In an optional embodiment of the present invention, before the performance test of the wireless terminal is performed, a sending end, a receiving end, the first testing device, and the second testing device may be synchronously calibrated based on a Global Positioning System (GPS) signal introduced in a darkroom of an electric wave, so as to improve the accuracy of the test.
In the above, various implementation manners of each link of the embodiment shown in fig. 1 are introduced, and the implementation process of the wireless terminal performance testing method of the present invention will be described in detail through specific embodiments.
In the specific embodiment of the invention, the wireless terminal performance test is to test the performance of the LTE-V2X terminal in an anechoic chamber environment, the transmitting end is an OBU vehicle-mounted unit and/or an RSU road side unit, and the receiving end is an OBU vehicle-mounted unit and/or an RSU road side unit. The embodiment of the invention adopts a scheme for testing the performance of the LTE-V2X terminal in an anechoic chamber environment, and the specific scheme comprises the following steps a) to h).
a) And synchronously calibrating the tested equipment and the testing equipment based on the GPS signal introduced into the anechoic chamber.
In the step, the tested device comprises a transmitting end OBU vehicle-mounted unit and/or an RSU road-side unit and a receiving end OBU vehicle-mounted unit and/or an RSU road-side unit.
b) The method comprises the steps of building an LTE-V2X terminal performance test system, and setting configuration parameters of a tested device, wherein the configuration parameters of the tested device comprise at least one of the following parameters: communication channel, communication bandwidth, transmission power.
In this step, a built LTE-V2X terminal performance test system is as shown in fig. 3, where the test system includes a anechoic chamber, and a first test device, a sending end OBU/RSU, a channel simulator, an adjustable attenuator, a receiving end OBU/RSU, and a second test device that are located in the anechoic chamber and connected in sequence along a signal transmission direction, where the sending end OBU/RSU and the receiving end OBU/RSU are respectively placed in two shielding boxes.
c) And determining a corresponding channel model according to a scene to be tested, and determining a signal propagation path loss value under the scene according to the channel model.
d) And judging whether the determined signal propagation path loss value under the scene is larger than the upper limit value of the signal propagation path loss which can be simulated by the channel simulator.
e) If not, setting configuration parameters of a channel simulator, and simulating the actual signal propagation path loss under the scene through the channel simulator, wherein the configuration parameters of the channel simulator comprise a signal propagation path loss value, and further comprise at least one of the following: channel model, communication distance, relative movement speed of the OBU and the RSU, relative movement speed of the OBU and the OBU, and signal-to-noise ratio.
f) If yes, setting configuration parameters of the channel simulator, setting an attenuation value of the adjustable attenuator, and simulating the actual signal propagation path loss under the scene through the channel simulator and the adjustable attenuator, wherein the sum of the set signal propagation path loss value of the channel simulator and the set attenuation value of the adjustable attenuator is equal to the determined signal propagation path loss value under the scene.
g) And (3) testing the packet loss rate and the time delay of the system: generating sending data by first test equipment according to a specified sending data structure, controlling an OBU/RSU (on-board unit/remote subscriber unit) at a sending end to send the sending data, and recording a sending log, wherein the initial packet sending time is a random value within [0ms,100ms ], and the data communication time is not less than 200 s; receiving the sending data transmitted by the corresponding V2V/V2I communication link by the receiving end OBU/RSU to obtain receiving data, and transmitting the receiving data to second test equipment; adding the received data to the transmitted data by the second test equipment, and recording a receiving log; and processing the sending log and the receiving log by the first test equipment or the second test equipment to obtain the system packet loss rate and the time delay of the communication link of the sending end OBU/RSU and the receiving end OBU/RSU.
h) And d), repeating the steps b) to g), and completing the test of the packet loss rate and the time delay in different scenes.
The LTE-V2X terminal performance testing method is provided by the scheme, wherein an adjustable attenuator is arranged in an anechoic chamber environment, and the signal propagation path loss simulation range is enlarged. As shown in step f), if the signal propagation path loss that can be simulated by the channel simulator cannot reach the signal propagation path loss value determined in step c), simulating the actual signal propagation path loss value in different scenes through the sum of the attenuation value of the adjustable attenuator and the signal propagation path loss value set by the channel simulator, so as to realize the simulation of different signal propagation path loss values in different scenes in the anechoic environment.
Secondly, according to the scheme, the LTE-V2X communication link performance test is carried out in the anechoic chamber environment, so that a large amount of test workload aiming at different scenes in actual test is avoided, the test time is greatly shortened, the test difficulty is reduced, the test workload is easy to reappear, and meanwhile, the danger caused by the fact that the relative speeds of the OBU and the RSU are high in different scenes is effectively reduced. And moreover, the conduction test in the anechoic chamber is realized, the channel environment is clean, the problem that the external field test result is influenced by the communication environment interference signal is solved, and the high-efficiency, accurate and safe test is finally realized.
It should be noted that, in practical applications, all the above optional embodiments may be combined in a combined manner at will to form an optional embodiment of the present invention, and details are not described here any more.
Based on the same inventive concept, the embodiment of the present invention further provides a wireless terminal performance testing apparatus, which is used for supporting the wireless terminal performance testing method provided by any one of the above embodiments or a combination thereof. Fig. 4 is a schematic structural diagram of a wireless terminal performance testing apparatus according to an embodiment of the present invention. Referring to fig. 4, the wireless terminal performance testing apparatus may include at least: the device comprises a building module 410, a determining module 420, a judging module 430, a setting module 440 and a performance testing module 450.
The functions of the components or devices of the wireless terminal performance testing device of the embodiment of the present invention and the connection relationship between the components are described as follows:
the building module 410 is suitable for building a wireless terminal performance test system, wherein the system at least comprises an anechoic chamber, and a first test device, a sending terminal, a channel simulator, an adjustable attenuator, a receiving terminal and a second test device which are sequentially connected along a signal transmission direction in the anechoic chamber, as shown in fig. 2 or fig. 3;
the determining module 420 is adapted to determine a corresponding channel model according to a scene to be tested when performing a performance test of the wireless terminal, and determine a signal propagation path loss value in the scene according to the channel model;
the judging module 430 is adapted to judge whether the determined signal propagation path loss value in the scene is greater than the upper limit value of the signal propagation path loss that can be simulated by the channel simulator, so as to obtain a judgment result;
a setting module 440 adapted to:
if the judgment result is negative, setting configuration parameters of a channel simulator, and simulating the actual signal propagation path loss under the scene through the channel simulator, wherein the configuration parameters of the channel simulator at least comprise a signal propagation path loss value;
if the judgment result is yes, setting configuration parameters of the channel simulator, setting an attenuation value of the adjustable attenuator, and simulating the actual signal propagation path loss under the scene through the channel simulator and the adjustable attenuator, wherein the sum of the set signal propagation path loss value of the channel simulator and the set attenuation value of the adjustable attenuator is equal to the determined signal propagation path loss value under the scene; and
a performance testing module 450 adapted to:
generating sending data by first test equipment, controlling a sending end to send the sending data, and recording a sending log; receiving, by the receiving end, the transmission data transmitted through the corresponding communication link to obtain reception data, and transmitting the reception data to the second test device; adding the received data to the transmitted data by the second test equipment, and recording a receiving log; and processing the sending log and the receiving log to obtain the system performance of a communication link between the sending end and the receiving end.
In an alternative embodiment, the wireless terminal performance test comprises the performance test of an LTE-V2X terminal in a anechoic environment, the transmitting terminal comprises an LTE-V2X terminal, and the receiving terminal comprises an LTE-V2X terminal. Further, the transmitting end comprises an OBU vehicle-mounted unit and/or an RSU road side unit, and the receiving end comprises an OBU vehicle-mounted unit and/or an RSU road side unit.
In an alternative embodiment, the configuration parameters of the channel simulator further comprise at least one of:
the method comprises the following steps of a channel model, a communication distance, relative motion speed of a sending end and a receiving end and signal to noise ratio.
In an alternative embodiment, the system performance includes packet loss rate and/or latency.
In an optional embodiment, the apparatus for testing performance of a wireless terminal may further include:
and the synchronous calibration module is suitable for synchronously calibrating the sending end, the receiving end, the first test equipment and the second test equipment based on a GPS (global positioning system) signal introduced in a anechoic chamber before the performance test of the wireless terminal is carried out.
According to any one or a combination of multiple optional embodiments, the embodiment of the present invention can achieve the following advantages:
according to the method and the device for testing the performance of the wireless terminal in the anechoic chamber, the adjustable attenuator is arranged in the anechoic chamber, when the signal propagation path loss value which can be simulated by the channel simulator cannot reach the signal propagation path loss value required by a test scene, the actual signal propagation path loss values in different scenes are simulated through the attenuation value of the adjustable attenuator and the signal propagation path loss value arranged by the channel simulator, and the problem that the channel simulator cannot simulate the signal propagation path loss in all scenes when the performance test is carried out in a laboratory is solved. Moreover, the LTE-V2X communication link performance test is carried out in the anechoic chamber environment, a large amount of test workload aiming at different scenes in the actual test is avoided, the test time is greatly shortened, the test difficulty is reduced, the test work is easy to reappear, the danger caused by high relative speed of the OBU and the RSU in different scenes is effectively reduced, the problem that the external field test result is influenced by communication environment interference signals is solved, and the efficient, accurate and safe test is finally realized.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
The various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. Those skilled in the art will appreciate that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functions of some or all of the components in a wireless terminal performance testing apparatus according to embodiments of the present invention. The present invention may also be embodied as apparatus or device programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present invention may be stored on computer-readable media or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. A wireless terminal performance test method comprises the following steps:
the method comprises the steps of setting up a wireless terminal performance test system, wherein the system comprises an anechoic chamber, and first test equipment, a sending end, a channel simulator, an adjustable attenuator, a receiving end and second test equipment which are sequentially connected along a signal transmission direction and are positioned in the anechoic chamber;
when the performance of the wireless terminal is tested, determining a corresponding channel model according to a scene to be tested, and determining a signal propagation path loss value under the scene according to the channel model;
judging whether the determined signal propagation path loss value under the scene is larger than the upper limit value of the signal propagation path loss which can be simulated by the channel simulator;
if not, setting configuration parameters of the channel simulator, and simulating the actual signal propagation path loss under the scene through the channel simulator, wherein the configuration parameters of the channel simulator at least comprise a signal propagation path loss value;
if yes, setting configuration parameters of the channel simulator, setting an attenuation value of the adjustable attenuator, and simulating actual signal propagation path loss under the scene through the channel simulator and the adjustable attenuator, wherein the sum of the set signal propagation path loss value of the channel simulator and the set attenuation value of the adjustable attenuator is equal to the determined signal propagation path loss under the scene;
the first test equipment generates sending data, controls the sending end to send the sending data and records a sending log;
receiving, by the receiving end, the transmission data transmitted through the corresponding communication link to obtain reception data, and transmitting the reception data to the second test device;
adding, by the second test device, the received data to the transmitted data and recording a received log;
processing the sending log and the receiving log to obtain the system performance of a communication link of the sending end and the receiving end;
the configuration parameters of the channel simulator further include at least one of:
the method comprises the following steps of (1) carrying out channel model, communication distance, relative motion speed of a sending end and a receiving end and signal-to-noise ratio; wherein
If the determined signal propagation path loss value under the scene is greater than the signal propagation path loss upper limit value which can be simulated by the channel simulator, simulating the actual signal propagation path loss under the scene by the channel simulator and the adjustable attenuator comprises:
setting the signal propagation path loss value of the channel simulator as the upper limit value of the signal propagation path loss which can be simulated by the channel simulator, and setting the attenuation value of the adjustable attenuator so that the sum of the set signal propagation path loss value of the channel simulator and the set attenuation value of the adjustable attenuator is equal to the determined signal propagation path loss value under the scene.
2. The method of claim 1, wherein the wireless terminal performance testing comprises performing LTE-V2X terminal performance testing in anechoic environment, the transmitting end comprises an LTE-V2X terminal, and the receiving end comprises an LTE-V2X terminal.
3. The method for testing the performance of the wireless terminal according to claim 2, wherein the transmitting end comprises an OBU vehicle-mounted unit and/or an RSU road-side unit, and the receiving end comprises an OBU vehicle-mounted unit and/or an RSU road-side unit.
4. The method according to claim 1, wherein the system performance includes a packet loss rate and/or a time delay.
5. The method for testing the performance of the wireless terminal according to any one of claims 1 to 4, further comprising:
before the performance test of the wireless terminal is carried out, the sending end, the receiving end, the first test equipment and the second test equipment are synchronously calibrated based on a GPS signal introduced into the anechoic chamber.
6. A wireless terminal performance testing apparatus, comprising:
the system comprises an electric wave darkroom, and a first test device, a sending end, a channel simulator, an adjustable attenuator, a receiving end and a second test device which are sequentially connected along the signal transmission direction and are positioned in the electric wave darkroom;
the device comprises a determining module, a judging module and a judging module, wherein the determining module is suitable for determining a corresponding channel model according to a scene to be tested when the wireless terminal performance is tested, and determining a signal propagation path loss value under the scene according to the channel model;
the judging module is suitable for judging whether the signal propagation path loss value under the determined scene is larger than the upper limit value of the signal propagation path loss which can be simulated by the channel simulator or not to obtain a judging result;
a setting module adapted to:
if the judgment result is negative, setting configuration parameters of the channel simulator, and simulating the actual signal propagation path loss under the scene through the channel simulator, wherein the configuration parameters of the channel simulator at least comprise a signal propagation path loss value;
if the judgment result is yes, setting configuration parameters of the channel simulator, setting an attenuation value of the adjustable attenuator, and simulating actual signal propagation path loss under the scene through the channel simulator and the adjustable attenuator, wherein the sum of the set signal propagation path loss value of the channel simulator and the set attenuation value of the adjustable attenuator is equal to the determined signal propagation path loss under the scene; and
a performance testing module adapted to:
the first test equipment generates sending data, controls the sending end to send the sending data and records a sending log;
receiving, by the receiving end, the transmission data transmitted through the corresponding communication link to obtain reception data, and transmitting the reception data to the second test device;
adding, by the second test device, the received data to the transmitted data and recording a received log;
processing the sending log and the receiving log to obtain the system performance of a communication link of the sending end and the receiving end;
the configuration parameters of the channel simulator further include at least one of:
the method comprises the following steps of (1) carrying out channel model, communication distance, relative motion speed of a sending end and a receiving end and signal-to-noise ratio; wherein
The setting module is further adapted to:
and if the determined signal propagation path loss value under the scene is larger than the upper limit value of the signal propagation path loss which can be simulated by the channel simulator, setting the signal propagation path loss value of the channel simulator as the upper limit value of the signal propagation path loss which can be simulated by the channel simulator, and setting the attenuation value of the adjustable attenuator so that the sum of the set signal propagation path loss value of the channel simulator and the set attenuation value of the adjustable attenuator is equal to the determined signal propagation path loss value under the scene.
7. The apparatus of claim 6, wherein the wireless terminal performance test comprises a performance test of an LTE-V2X terminal in a anechoic environment, the transmitter comprises an LTE-V2X terminal, and the receiver comprises an LTE-V2X terminal.
8. The device for testing the performance of the wireless terminal according to claim 7, wherein the transmitting end comprises an OBU vehicle-mounted unit and/or an RSU road side unit, and the receiving end comprises an OBU vehicle-mounted unit and/or an RSU road side unit.
9. The apparatus of claim 6, wherein the system performance comprises a packet loss rate and/or a time delay.
10. The wireless terminal performance testing apparatus according to any one of claims 6 to 9, further comprising:
and the synchronous calibration module is suitable for synchronously calibrating the transmitting end, the receiving end, the first test equipment and the second test equipment based on a GPS (global positioning system) signal introduced into the anechoic chamber before the performance test of the wireless terminal is carried out.
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