CN111417141B - Terminal test method, base station simulator and terminal test system - Google Patents
Terminal test method, base station simulator and terminal test system Download PDFInfo
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- CN111417141B CN111417141B CN201910010613.6A CN201910010613A CN111417141B CN 111417141 B CN111417141 B CN 111417141B CN 201910010613 A CN201910010613 A CN 201910010613A CN 111417141 B CN111417141 B CN 111417141B
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- H04W24/06—Testing, supervising or monitoring using simulated traffic
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- H04B17/0087—Monitoring; Testing using service channels; using auxiliary channels using auxiliary channels or channel simulators
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
- H04B17/3911—Fading models or fading generators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/391—Modelling the propagation channel
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Abstract
The embodiment of the invention provides a terminal test method, a base station simulator and a terminal test system, wherein the method comprises the following steps: determining a first measurement result, wherein the first measurement result represents the corresponding relation between the measured downlink throughput of the terminal and the unit energy RS EPRE of the reference signal of the terminal per resource; determining a second measurement result, wherein the second measurement result represents the corresponding relation between the uplink and downlink overall throughput of the terminal and the RS EPRE of the terminal; and determining the index of the uplink MIMO performance of the terminal according to the first measurement result and the second measurement result. In the embodiment of the invention, the uplink MIMO performance index of the terminal is determined by utilizing the downlink throughput performance of the terminal and the uplink and downlink overall throughput performance of the terminal, so that the influence of the instrument demodulation capacity of the base station simulator is avoided, and the uplink throughput performance of the measuring terminal has a uniform measuring index specification.
Description
Technical Field
The embodiment of the invention relates to the technical field of terminals, in particular to a terminal testing method, a base station simulator and a terminal testing system.
Background
The New Radio (NR) terminal has the characteristic of uplink dual transmission, and the terminal uplink adopts a Multiple-Input Multiple-Output (MIMO) technology, so that the uplink throughput can be effectively improved, and the terminal access capability can be enhanced. Factors such as correlation and consistency of transmitting antennas can affect The quality of signals transmitted by a terminal, and in order to ensure uplink throughput of The terminal, an uplink MIMO Over The Air (OTA) test is required to ensure uplink performance of The terminal. Because the second-generation communication technology (2G)/third-generation communication technology (3G)/fourth-generation communication technology (4G) terminal generally only uses the MIMO technology at the receiving end, the MIMO OTA test scheme of the terminal at present mainly uses the downlink throughput of the terminal along with the Energy per Resource unit of the Reference Signal at the terminal side (RS EPRE variation curve for evaluation).
The scheme of performing uplink MIMO OTA testing by using a multi-probe darkroom method is shown in fig. 1, wherein a rotary table 11 is used for fixing a tested terminal 12 and enabling the terminal to rotate to different angles according to actual testing requirements; the measuring antenna 13 is installed around the darkroom 14 according to the requirement of the channel model, and is used for receiving the uplink signal of the terminal 12 and mapping the uplink signal to the channel simulator 15; the channel simulator 15 is used for simulating a wireless fading channel, and adding multipath, doppler and other channel characteristics to the signal received by the measuring antenna 13; the base station simulator 16 is configured to simulate a base station to establish a connection with the terminal 12, demodulate an uplink signal transmitted by the terminal 12, and count an uplink throughput rate.
At present, in a multi-probe darkroom, the uplink MIMO OTA test steps of a terminal are as follows:
before testing, the base station simulator establishes connection with the terminal and controls the terminal to be always in a two-stream transmission state. In the testing process, the base station simulator controls the terminal to transmit an uplink data signal through a downlink communication link, the terminal transmits an uplink signal, the uplink signal is received by the antennas around the darkroom and added into the required uplink channel fading by the base station simulator, and then the uplink signal is mapped to a receiving port of the base station simulator and demodulated, so that a testing loop is constructed. The base station simulator demodulates the uplink signal and calculates the uplink throughput. When the base station simulator is accessed for the first time, the tested terminal carries out uplink transmission with the maximum transmission power, the RS EPRE and the uplink actual throughput of the base station side at the moment are recorded, the base station simulator controls the terminal to gradually reduce the uplink transmission power under the condition that the connection is not disconnected, and the RS EPRE and the corresponding throughput of the base station side after the power is regulated each time are recorded. And measuring to obtain an uplink curve of the terminal. And adjusting the placing position of the terminal in the horizontal direction until the test in all directions is completed. And testing according to the steps, so that uplink curves of the terminal at different placing positions can be measured, and the curves are averaged, thereby obtaining the uplink performance curve of the terminal.
In the existing uplink MIMO OTA test scheme, uplink throughput is counted according to the demodulation condition of the base station simulator, so the demodulation capability of the base station simulator directly affects the measurement result of the uplink throughput. However, the demodulation performance of the meter is directly related to the algorithm, hardware design and the like adopted by the meter, and is difficult to be limited by adopting a uniform standard. Therefore, the uplink throughput performance of the terminal measured by different base station simulators is different, so that the quality of different terminals can be qualitatively judged only by measuring the uplink throughput performance of different terminals under the same base station simulator, but the real uplink MIMO level of the terminal cannot be quantitatively obtained, and the performance of the terminal cannot be standardized by adopting a uniform measurement index.
Disclosure of Invention
The embodiment of the invention provides a terminal test method, a base station simulator and a terminal test system, which solve the problem that the performance of a terminal cannot be standardized by adopting a uniform measurement index in the conventional terminal test method.
According to a first aspect of the embodiments of the present invention, there is provided a terminal testing method applied to a base station simulator, the method including: determining a first measurement result, wherein the first measurement result represents the corresponding relation between the measured downlink throughput of the terminal and the unit energy per resource (RS EPRE) of the reference signal of the terminal; determining a second measurement result, wherein the second measurement result represents the corresponding relation between the uplink and downlink overall throughput of the terminal and the RS EPRE of the terminal; and determining the index of the uplink MIMO performance of the terminal according to the first measurement result and the second measurement result.
Optionally, the determining the first measurement result comprises: sending a first downlink signal to the terminal; receiving first feedback information sent by the terminal, wherein the first feedback information is information fed back by the terminal according to the first downlink signal; and determining the first measurement result according to the first feedback information.
Optionally, the determining the first measurement result according to the first feedback information of the first downlink signal received by the terminal includes: reducing the power of the first downlink signal under the condition that the terminal is not disconnected; according to the ACK (acknowledgement) information and/or NACK (negative acknowledgement) information in the first feedback information, counting first throughput changes of the terminal at different testing angles and corresponding first RS EPRE changes; obtaining a plurality of first curves of the terminal at different test angles according to the first throughput change and the first RS EPRE change; and averaging the plurality of first curves to obtain a second curve, wherein the second curve is used for representing the first measurement result.
Optionally, the determining a second measurement result includes: mapping according to a first uplink signal sent by the terminal to obtain a second downlink signal; receiving second feedback information sent by the terminal, wherein the second feedback information is information fed back by the terminal according to the second downlink signal; and determining the second measurement result according to second feedback information of the second downlink signal received by the terminal.
Optionally, the determining, according to the feedback information of the second downlink signal received by the terminal, the second measurement result includes: reducing the power of the second downlink signal under the condition of ensuring that the terminal is not disconnected; according to the ACK information and/or NACK information in the second feedback information, second throughput changes of the terminal at different testing angles and corresponding second RS EPRE changes are counted; obtaining a plurality of third curves of the terminal at different test angles according to the second throughput change and the second RS EPRE change; and averaging the plurality of third curves to obtain a fourth curve, wherein the fourth curve is used for representing the second measurement result. Optionally, the mapping to obtain the second downlink signal according to the first uplink signal sent by the terminal includes: receiving a second uplink signal, wherein the second uplink signal is obtained by adding channel attenuation into the first uplink signal sent by the terminal through a channel simulator; sampling the second uplink signal to obtain the relevant information of a Physical Uplink Shared Channel (PUSCH) of the second uplink signal; mapping the second uplink signal to a Physical Downlink Shared Channel (PDSCH) according to the relevant information to obtain a third downlink signal; and sending the third downlink signal to the channel simulator, and adding channel attenuation into the third downlink signal by the channel simulator to obtain the second downlink signal.
Optionally, the determining, according to the first measurement result and the second measurement result, an index of uplink MIMO performance of the terminal includes: calculating the difference value of the RS EPRE corresponding to the same throughput of the first measurement result and the second measurement result; and determining the difference value of the RS EPRE as the uplink MIMO performance index of the terminal.
According to a second aspect of the embodiments of the present invention, there is provided a base station simulator, including: the device comprises a transceiver and a processor, wherein the processor is used for determining a first measurement result, and the first measurement result represents the corresponding relation between the measured downlink throughput of the terminal and the unit energy per resource (RS EPRE) of a reference signal of the terminal; the processor is further configured to determine a second measurement result, where the second measurement result indicates a corresponding relationship between the uplink and downlink overall throughput of the terminal and the RS EPRE of the terminal; the processor is further configured to determine an indicator of uplink multiple-input multiple-output (MIMO) performance of the terminal according to the first measurement result and the second measurement result.
Optionally, the transceiver is configured to transmit a first downlink signal to the terminal; the transceiver is further configured to receive first feedback information sent by the terminal, where the first feedback information is information fed back by the terminal according to the first downlink signal; the processor is further configured to determine the first measurement result according to the first feedback information.
Optionally, the processor is further configured to reduce the power of the first downlink signal under the condition that it is ensured that the terminal is not disconnected; the processor is further configured to count first throughput changes of the terminal at different test angles and corresponding first RS EPRE changes according to acknowledgement ACK information and/or negative acknowledgement NACK information in the first feedback information; the processor is further configured to obtain a plurality of first curves of the terminal at different test angles according to the first throughput change and the first RS EPRE change; the processor is further configured to average the plurality of first curves to obtain a second curve, where the second curve is used to represent the first measurement result.
Optionally, the processor is further configured to obtain a second downlink signal according to mapping of a first uplink signal sent by the terminal; the transceiver is further configured to receive second feedback information sent by the terminal, where the second feedback information is information fed back by the terminal according to the second downlink signal; the processor is further configured to determine the second measurement result according to the second feedback information.
Optionally, the processor is further configured to reduce the power of the second downlink signal under a condition that it is ensured that the terminal is not disconnected; the processor is further configured to count second throughput changes of the terminal at different test angles and corresponding second RS EPRE changes according to ACK information and/or NACK information in the second feedback information; the processor is further configured to obtain a plurality of third curves of the terminal at different test angles according to the second throughput change and the second RS EPRE change; the processor is further configured to average the plurality of third curves to obtain a fourth curve, where the fourth curve is used to represent the second measurement result.
Optionally, the transceiver is further configured to receive a second uplink signal, where the second uplink signal is obtained by adding channel fading to the first uplink signal sent by the terminal through a channel simulator; the processor is further configured to sample the second uplink signal to obtain relevant information of a Physical Uplink Shared Channel (PUSCH) of the second uplink signal; the processor is further configured to map the second uplink signal to a physical downlink shared channel PDSCH according to the relevant information to obtain a third downlink signal; the transceiver is further configured to send the third downlink signal to the channel emulator, and the channel emulator adds channel attenuation to the third downlink signal to obtain the second downlink signal.
Optionally, the processor is further configured to calculate a difference between the first measurement result and the RS EPRE corresponding to the second measurement result at the same throughput; and the processor is further used for determining the difference value of the RS EPRE as an index of the uplink MIMO performance of the terminal.
According to a third aspect of the embodiments of the present invention, there is provided a terminal test system, including: a channel emulator and a base station simulator as described in the second aspect.
According to a fourth aspect of the embodiments of the present invention, there is provided a base station simulator, which includes a processor, a memory and a program stored in the memory and capable of running on the processor, wherein when the program is executed by the processor, the method implements the steps of the terminal testing method according to the first aspect.
According to a fifth aspect of embodiments of the present invention, there is provided a computer-readable storage medium, characterized in that the computer-readable storage medium stores thereon a computer program, which when executed by a processor implements the steps of the terminal testing method according to the first aspect.
In the embodiment of the invention, the uplink MIMO performance index of the terminal is determined by utilizing the downlink throughput performance of the terminal and the uplink and downlink overall throughput performance of the terminal, so that the influence of the instrument demodulation capacity of the base station simulator is avoided, and the uplink throughput performance of the measuring terminal has a uniform measuring index specification.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a conventional terminal testing system;
fig. 2 is a schematic structural diagram of a terminal test system according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of a terminal testing method according to an embodiment of the present invention;
fig. 4a is a schematic flow chart of determining a first measurement result according to an embodiment of the present invention;
fig. 4b is a schematic flowchart of determining a first measurement result according to first feedback information according to an embodiment of the present invention;
fig. 5a is a schematic flowchart of determining a second measurement result according to an embodiment of the present invention;
fig. 5b is a schematic flowchart of a process of mapping a first uplink signal to obtain a second downlink signal according to an embodiment of the present invention;
fig. 5c is a schematic flowchart of determining a second measurement result according to second feedback information according to an embodiment of the present invention;
FIG. 6a is a schematic diagram of a V2V communication resource pool configuration;
FIG. 6b is a second schematic diagram of a V2V communication resource pool configuration;
fig. 7 is a schematic structural diagram of a base station simulator according to an embodiment of the present invention;
fig. 8 is a second schematic structural diagram of a base station simulator according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to fig. 2, an embodiment of the present invention provides a terminal testing system, including: a central controller 21, a base station simulator 22, a channel simulator 23, an anechoic chamber 24, and a turntable 27 for placing a terminal 26, and a plurality of antennas 25 are provided in the anechoic chamber 24.
Wherein, the central controller 21: for completing the adaptation of the base station simulator 22, the configuration of the channel simulator 23, the control of the turntable 27, and the control of the antenna 25;
base station simulator 22: for establishing a communication connection with the terminal 26 via the analog communication network; demodulating control information in an uplink communication link to obtain a demodulation result of the terminal 26 and counting the throughput of the terminal 26; receiving signals added with uplink channel fading of an uplink receiving link around the anechoic chamber 24, constructing a database to record relevant information of uplink data signals, mapping the information to a downlink data channel, amplifying power and outputting the information to the channel simulator 23;
the channel emulator 23: for uplink signals, the channel simulator 23 adds uplink channel fading to each path of signals received by an antenna 25 in an anechoic chamber 24 and maps the signals to a receiving port of the base station simulator 22; for downlink signals, the channel simulator 23 adds downlink fading channels to the downlink signals sent by the base station simulator 22 and maps the downlink fading channels to each port of the antenna 25 in the anechoic chamber 24;
anechoic chamber 24: the wave-absorbing material 241 and the plurality of antennas 25 are arranged around the anechoic chamber 24 according to the requirements of the channel model, wherein the wave-absorbing material 241 is used for eliminating external clutter interference and improving measurement accuracy and efficiency, and preferably, the wave-absorbing material 241 is in a wedge shape.
Antenna 25: according to different capacities of the channel simulator 23 and the antenna 25, the same antenna port can be multiplexed in uplink and downlink, and different antenna ports can be adopted to realize simultaneous construction of uplink and downlink channel models. In addition, the plurality of antennas 25 include one or more first antennas 251 and a plurality of second antennas 252, where the first antenna 251 is installed near the terminal and keeps the relative position with the terminal unchanged, and is used to receive the uplink signal transmitted by the terminal and directly feed back the uplink signal to the base station simulator 22; the second antenna 252 and the first antenna 251 jointly receive an uplink signal transmitted by the terminal, and feed the uplink signal back to the channel emulator 23, and the channel emulator 23 adds uplink channel fading to the uplink signal and maps the uplink signal to a receiving port of the base station simulator 22.
The turntable 27: for fixing the terminal 26, the measuring angle of the terminal 26 is adjusted by rotating the turntable 27.
Referring to fig. 3, an embodiment of the present invention provides a terminal testing method, where an execution subject of the method is a base station simulator, and the method includes the following specific steps:
step 301: determining a first measurement result;
in the embodiment of the present invention, the first measurement result indicates a correspondence between the measured downlink throughput of the terminal and the RS EPRE of the terminal.
It can be understood that, in the initial stage of the test, the central controller controls the base station simulator to establish connection with the terminal, so that the terminal maintains the two-stream transmission state, and initializes the anechoic chamber, and the turntable position is reset to zero, and the antenna path is opened.
Specifically, referring to fig. 4a, an embodiment of the present invention provides a process for determining a first measurement result:
step 3011: transmitting a first downlink signal to a terminal;
in the embodiment of the invention, the base station simulator is connected with the terminal, so that the terminal transmits at the maximum power, the channel simulator completes the configuration of a required downlink channel model, and the mapping from an output port of the channel simulator to an antenna in a anechoic chamber is completed. The base station simulator transmits downlink signals with certain directivity to the terminal through a plurality of antennas in the anechoic chamber, and a required wireless test environment is constructed around the tested terminal. Adjusting the power of the first downlink signal to enable the terminal to be in a maximum throughput state; and the base station simulator regulates the downlink power to enable the tested terminal to be in a 100% maximum throughput state.
The first downlink signal is power-amplified and then transmitted to the terminal. Further, the power amplification degree of the first downlink signal needs to be adjusted, so that the throughput of the terminal reaches more than 99% of the theoretical highest throughput, and the amplification degree is kept unchanged, when the RS EPRE reaches the maximum value allowed by the system, the throughput of the terminal still cannot reach 99% of the theoretical highest throughput, and the power amplification degree when the system allows the highest RS EPRE is kept unchanged.
Step 3012: receiving first feedback information sent by a terminal;
in the embodiment of the present invention, the first feedback information is information fed back by the terminal according to the first downlink signal.
Step 3013: determining a first measurement result according to the first feedback information;
in the embodiment of the invention, the corresponding relation between the downlink throughput of the terminal and the RS EPRE of the terminal is determined through the first feedback information.
Specifically, referring to fig. 4b, an embodiment of the present invention provides a process for determining a first measurement result according to first feedback information:
step 30131: reducing the power of the first downlink signal under the condition of ensuring that the terminal is not disconnected;
in the embodiment of the present invention, under the condition that it is ensured that the terminal is not disconnected, the power of the first downlink signal is continuously reduced, and preferably, the power of the first downlink signal is reduced according to a preset adjustment amount.
Step 30132: according to the ACK information and/or NACK information in the first feedback information, counting the first throughput change of the terminal at the current test angle and the energy RS EPRE change of each resource unit of the corresponding first reference signal;
in the embodiment of the invention, the terminal feeds back a plurality of pieces of first feedback information in the process of continuously reducing the power of the first downlink signal.
And counting the throughput of the terminal according to Acknowledgement (ACK) information and/or Negative Acknowledgement (NACK) information in the first feedback information, and calculating corresponding RS EPRE. In the testing process, according to ACK information and/or NACK information in the first feedback information, first throughput change of the terminal in the testing process and corresponding first RS EPRE change are obtained.
Step 30133: obtaining a first curve of the terminal at the current testing angle according to the first throughput change and the first RS EPRE change;
in the embodiment of the invention, the throughput of each terminal obtained through testing corresponds to one RS EPRE value, and a first curve can be obtained through multiple groups of throughputs and RS EPREs.
It should be noted that the above test procedure is a test performed for a current test angle of the terminal, and therefore the first curve only represents the downlink throughput performance of the terminal at the current test angle.
Step 30134: adjusting the test angle of the terminal, and then re-executing step 30131;
in the embodiment of the invention, the test angle of the terminal is adjusted by rotating the rotary table in the anechoic chamber. Optionally, the turntable is rotated by a preset rotation angle (e.g., 30 degrees) for each adjustment.
Step 30135: obtaining a plurality of first curves of the terminal at different test angles;
in the embodiment of the invention, after the different testing angles of the terminal are tested, a plurality of first curves are obtained and respectively correspond to the downlink throughput performance of each testing angle.
Step 30136: averaging the plurality of first curves to obtain a second curve;
in the embodiment of the invention, the plurality of first curves are averaged to obtain a second curve, and the first measurement result is represented by the second curve.
Step 302: determining a second measurement;
in the embodiment of the present invention, the second measurement result indicates a corresponding relationship between the measured uplink and downlink overall throughput of the terminal and the RS EPRE of the terminal.
Specifically, referring to fig. 5a, the embodiment of the present invention provides a process for determining the second measurement result:
step 3021: mapping according to a first uplink signal sent by a terminal to obtain a second downlink signal;
in the embodiment of the invention, a first uplink signal sent by a terminal is converted into a second downlink signal, the second downlink signal is sent to the terminal, and the terminal demodulates and feeds back the second downlink signal. In this way, the throughput performance obtained by the terminal through feedback of the second downlink signal includes the comprehensive throughput performance of uplink and downlink of the terminal.
Specifically, referring to fig. 5b, an embodiment of the present invention provides a process for mapping a first uplink signal to obtain a second downlink signal:
step 30211: receiving a second uplink signal;
in the embodiment of the invention, a first uplink signal of a terminal is received through a second antenna in a anechoic chamber, the first uplink signal is sent to a channel simulator, a second uplink signal is obtained after channel attenuation is added into the first uplink signal through the channel simulator, and the second uplink signal is sent to a base station simulator by the channel simulator.
Step 30212: sampling the second uplink signal to obtain the relevant information of the PUSCH of the second uplink signal;
in this embodiment of the present invention, the base station simulator samples a Physical Uplink Shared Channel (PUSCH) of the second Uplink signal to obtain related information of the PUSCH of the second Uplink signal, that is, related information of the terminal Uplink data signal, where the related information may include: relative timing, frequency, amplitude, and phase of the signals, etc.
Optionally, the base station simulator stores the relevant information to the database after obtaining the relevant information.
Step 30213: mapping the second uplink signal to the PDSCH according to the relevant information to obtain a third downlink signal;
in the embodiment of the present invention, the base station simulator maps the second uplink signal to a Physical Downlink Shared Channel (PDSCH) according to the relevant information, that is, maps the uplink data signal of the terminal to the PDSCH, so as to obtain the third Downlink signal.
Further, since 5G is currently a Time Division Duplex (TDD) band, the relative timing, frequency, amplitude, and phase of the signal are all consistent with the uplink signal in the mapping process.
Step 30214: sending the third downlink signal to a channel simulator;
in the embodiment of the invention, the channel simulator adds the channel attenuation into the third downlink signal to obtain a second downlink signal, and the second downlink signal is sent to the terminal.
It should be noted that the second downlink signal is amplified in power and then transmitted to the terminal. Further, the power amplification degree of the second downlink signal needs to be adjusted, so that the throughput of the terminal reaches more than 99% of the theoretical highest throughput, and the amplification degree is kept unchanged, when the RS EPRE reaches the maximum value allowed by the system, the throughput of the terminal still cannot reach 99% of the theoretical highest throughput, and the power amplification degree when the system allows the highest RS EPRE is kept unchanged.
Step 3022: receiving second feedback information sent by the terminal;
in this embodiment of the present invention, the second feedback information is information fed back by the terminal according to the second downlink signal.
Step 3023: determining a second measurement result according to the second feedback information;
in the embodiment of the invention, the corresponding relation between the uplink and downlink overall throughput of the terminal and the RS EPRE of the terminal is determined through the second feedback information.
Specifically, referring to fig. 5c, an embodiment of the present invention provides a process for determining a second measurement result according to second feedback information:
step 30231: reducing the power of a second downlink signal under the condition of ensuring that the terminal is not disconnected;
in the embodiment of the present invention, under the condition that it is ensured that the terminal is not disconnected, the power of the second downlink signal is continuously reduced, and preferably, the power of the second downlink signal is reduced according to a preset adjustment amount.
Step 30232: according to the ACK information and/or NACK information in the second feedback information, the second throughput change of the terminal at the current testing angle and the corresponding second RS EPRE change are counted;
in the embodiment of the present invention, the sent second feedback information is an uplink control signal, and since the uplink transmission signal of the terminal is weak, in order to ensure that the feedback information of the terminal can be correctly fed back to the base station simulator, the quality of the uplink control signal of the terminal needs to be ensured. Therefore, the second feedback information of the terminal is received by the first antenna in the anechoic chamber, and is directly transmitted to the base station simulator.
It can be understood that, in the process of continuously reducing the power of the second downlink signal, the terminal may feed back a plurality of second feedback information.
In the embodiment of the invention, the throughput of the terminal is counted according to the ACK information and/or NACK information in the second feedback information, and the corresponding RS EPRE is calculated. And in the test process, according to the ACK information and/or NACK information in the plurality of second feedback information, obtaining the second throughput change of the terminal in the test process and the corresponding second RS EPRE change.
Step 30233: obtaining a third curve of the terminal at the current testing angle according to the second throughput change and the second RS EPRE change;
in the embodiment of the invention, the throughput of each terminal obtained through testing corresponds to one RS EPRE value, and a third curve can be obtained through multiple groups of throughputs and RS EPREs.
It should be noted that, because the second downlink signal is obtained by converting the first uplink signal transmitted by the terminal, and the second downlink signal includes information of the uplink throughput performance of the terminal, after the terminal demodulates and feeds back the second feedback information according to the second downlink signal, the base station simulator calculates a third curve from the second feedback information to indicate the uplink and downlink overall throughput performance of the terminal.
The above test process is a test performed for the current test angle of the terminal, so the third curve only represents the uplink and downlink overall throughput performance of the terminal at the current test angle.
Step 30234: adjusting the test angle of the terminal, and then re-executing step 30231;
in the embodiment of the invention, the test angle of the terminal is adjusted by rotating the rotary table in the anechoic chamber. Optionally, the turntable is rotated by a preset rotation angle (e.g., 30 degrees) for each adjustment.
Step 30235: obtaining a plurality of third curves of the terminal at different test angles;
in the embodiment of the invention, after the different test angles of the terminal are tested, a plurality of third curves are obtained, and the third curves respectively correspond to the uplink and downlink overall throughput performance of each test angle.
Step 30236: averaging the plurality of third curves to obtain a fourth curve;
in the embodiment of the invention, the plurality of third curves are averaged to obtain a fourth curve, and the fourth curve represents the second measurement result.
Step 303: and determining the uplink MIMO performance index of the terminal according to the first measurement result and the second measurement result.
In the embodiment of the invention, the difference value of the RS EPRE corresponding to the same throughput of the first measurement result and the second measurement result is calculated; and determining the uplink MIMO performance index of the terminal according to the RS EPRE difference.
Specifically, the difference of the RS EPRE at the same throughput level of the second curve and the fourth curve is used as an index for evaluating the uplink throughput performance of the terminal.
In the embodiment of the invention, the uplink MIMO performance index of the terminal is determined by utilizing the downlink throughput performance of the terminal and the uplink and downlink overall throughput performance of the terminal, so that the influence of the instrument demodulation capacity of the base station simulator is avoided, and the uplink throughput performance of the measuring terminal has a uniform measuring index specification.
A specific implementation of an embodiment of the present invention is provided below, taking Vehicle-to-Vehicle (V2V) communication as an example.
V2V communication is a communication scheme in which a terminal transmits and another terminal receives, but the timing at which a terminal transmits a signal may be scheduled by a base station. The same frame structure is used for both the transmitted and received signals.
The control information and the data information indicated by the control information are positioned in the same subframe, and the two resource allocation modes are total.
Referring to fig. 6a and fig. 6b, wherein Channel State Information (CSI) is control Information indicating a frequency domain position of a data signal, and the first way is that the control Information is adjacent to the data Information indicated by the control Information (as shown in fig. 6 a); the other is separate control information and data information indicated by it (as shown in fig. 6 b).
No matter which scheduling mode is adopted, the terminal carries out blind detection after receiving the signal and checks whether the signal contains control information. Since the CSI is located in the same subframe as the data signal indicated by the CSI, the terminal can demodulate the corresponding data signal as long as the terminal obtains the CSI information through blind detection.
In the V2V communication process, the time for the terminal to transmit the signal may be determined by the terminal itself or may be scheduled by the base station. Since the V2V terminal adopts a half duplex mode (data cannot be received while data is transmitted), in order to know the transmission time of the terminal in the test process, this test adopts a base station scheduling mode.
Meanwhile, because the signal transmitted by the terminal contains complete control information and data information, after the instrument receives the faded signal, the waveform information of the signal is stored, and when the terminal is in a receiving state, the downlink signal is transmitted according to the stored signal waveform, so that the conversion process from the uplink signal to the downlink signal can be completed.
In addition, because the current V2V terminal does not feed back ACK/NACK messages, the test scheme requires that the terminal can report the number of data packets correctly demodulated by the terminal currently in the test state (when the terminal is currently in the test state, the number of data packets correctly demodulated currently can be reported by an AT Command (Attention Command), so that only an Application Programming Interface (API) needs to be opened, and if the subsequent terminal supports ACK/NACK messages, this function is not needed.
The method comprises the following steps: the change curve of the instrument measuring terminal downlink throughput-RS EPRE at the placing position;
step two: the method for measuring the throughput of the terminal in demodulating the self-transmitted signal comprises the following steps:
(a) The instrument transmits control information, and the transmitting resource of the terminal is controlled according to the test requirement;
(b) The terminal transmits signals according to scheduling, and the instrument stores signal waveforms attenuated by the channel and forwards the signal waveforms at the moment of receiving by the terminal;
(c) The instrument counts the terminal throughput according to the number of correctly demodulated data packets reported by the terminal, and records the RS EPRE of the terminal side at the moment;
(d) Gradually reducing the transmitting power of the terminal, and drawing a variation curve of the throughput along with the RS EPRE of the terminal side;
step three: and adjusting the placing angle of the terminal in the horizontal position, repeating the first step and the second step, and calculating a downlink average curve of the terminal and a curve when the terminal transmits signals by itself. In the adopted quantity curve, the RS EPRE at the terminal side reaches the same throughput, and the difference value of the RS EPRE is caused by the difference between the quality of the terminal transmitting signal and the quality of the standard signal, so that the quality of the terminal transmitting signal can be evaluated.
Referring to fig. 7, a base station simulator 700 includes: a transceiver 701 and a processor 702;
the processor 702 is configured to determine a first measurement result, where the first measurement result represents a corresponding relationship between measured downlink throughput of the terminal and a reference signal per resource unit energy RS EPRE of the terminal;
the processor 702 is further configured to determine a second measurement result, where the second measurement result indicates a corresponding relationship between uplink and downlink overall throughput of the terminal and an RS EPRE of the terminal;
the processor 702 is further configured to determine an indicator of uplink multiple-input multiple-output MIMO performance of the terminal according to the first measurement result and the second measurement result.
Optionally, the transceiver 701 is configured to send a first downlink signal to the terminal;
the transceiver 701 is further configured to receive first feedback information sent by the terminal, where the first feedback information is information fed back by the terminal according to the first downlink signal;
the processor 702 is further configured to determine the first measurement result according to the first feedback information.
Optionally, the processor 702 is further configured to reduce the power of the first downlink signal if it is ensured that the terminal is not disconnected;
the processor 702 is further configured to count first throughput changes of the terminal at different test angles and corresponding first RS EPRE changes according to acknowledgement ACK information and/or negative acknowledgement NACK information in the first feedback information;
the processor 702 is further configured to obtain, according to the first throughput change and the first RS EPRE change, a plurality of first curves of the terminal at different test angles;
the processor 702 is further configured to average the plurality of first curves to obtain a second curve, where the second curve is used to represent the first measurement result.
Optionally, the processor 702 is further configured to obtain a second downlink signal according to a mapping of a first uplink signal sent by the terminal;
the transceiver 701 is further configured to receive second feedback information sent by the terminal, where the second feedback information is information fed back by the terminal according to the second downlink signal;
the processor 702 is further configured to determine the second measurement result according to the second feedback information.
Optionally, the processor 702 is further configured to reduce the power of the second downlink signal under the condition that it is ensured that the terminal is not disconnected;
the processor 702 is further configured to count second throughput changes of the terminal at different test angles and corresponding second RS EPRE changes according to ACK information and/or NACK information in the second feedback information;
the processor 702 is further configured to obtain a plurality of third curves of the terminal at different test angles according to the second throughput change and the second RS EPRE change;
the processor 702 is further configured to average the plurality of third curves to obtain a fourth curve, where the fourth curve is used to represent the second measurement result.
Optionally, the transceiver 701 is further configured to receive a second uplink signal, where the second uplink signal is obtained by adding channel fading to the first uplink signal sent by the terminal through a channel simulator;
the processor 702 is further configured to sample the second uplink signal to obtain relevant information of a physical uplink shared channel PUSCH of the second uplink signal;
the processor 702 is further configured to map the second uplink signal to a physical downlink shared channel PDSCH according to the relevant information, so as to obtain a third downlink signal;
the transceiver 701 is further configured to send the third downlink signal to the channel simulator, and the channel simulator adds channel attenuation to the third downlink signal to obtain the second downlink signal.
Optionally, the processor 702 is further configured to calculate a difference between the RS EPRE corresponding to the same throughput of the first measurement result and the second measurement result;
the processor 702 is further configured to determine the difference of the RS EPRE as an index of the uplink MIMO performance of the terminal.
In the embodiment of the invention, the uplink throughput performance of the terminal is determined by utilizing the downlink throughput performance of the terminal and the uplink and downlink overall throughput performance of the terminal, so that the influence of the instrument demodulation capacity of the base station simulator is avoided, and the uplink throughput performance of the measuring terminal has a uniform measuring index specification.
Referring to fig. 8, another base station simulator 800 is provided in an embodiment of the present invention, including: a processor 801, a transceiver 802, a memory 803, and a bus interface.
Among other things, the processor 801 may be responsible for managing the bus architecture and general processing. The memory 803 may store data used by the processor 801 in performing operations.
In this embodiment of the present invention, the base station simulator 800 may further include: a program stored on the memory 803 and executable on the processor 801, which when executed by the processor 801, performs the steps of the method provided by embodiments of the present invention.
In FIG. 8, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by a processor 801 and various circuits represented by a memory 803 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further in connection with embodiments of the present invention. The bus interface provides an interface. The transceiver 802 may be a plurality of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.
The embodiments of the present invention further provide a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the computer program implements the processes of the foregoing method embodiments, and can achieve the same technical effects, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a component of' 8230; \8230;" does not exclude the presence of another like element in a process, method, article, or apparatus that comprises the element.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (17)
1. A terminal test method is applied to a base station simulator, and is characterized by comprising the following steps:
determining a first measurement result, wherein the first measurement result represents the corresponding relation between the measured downlink throughput of the terminal and the unit energy per resource (RS EPRE) of the reference signal of the terminal;
determining a second measurement result, wherein the second measurement result represents the corresponding relation between the uplink and downlink overall throughput of the terminal and the RS EPRE of the terminal;
and determining the index of the uplink MIMO performance of the terminal according to the first measurement result and the second measurement result.
2. The method of claim 1, wherein determining the first measurement comprises:
sending a first downlink signal to the terminal;
receiving first feedback information sent by the terminal, wherein the first feedback information is information fed back by the terminal according to the first downlink signal;
and determining the first measurement result according to the first feedback information.
3. The method of claim 2, wherein the determining the first measurement result according to the first feedback information of the first downlink signal received by the terminal comprises:
reducing the power of the first downlink signal under the condition that the terminal is not disconnected;
according to the ACK (acknowledgement) information and/or NACK (negative acknowledgement) information in the first feedback information, counting first throughput changes of the terminal at different testing angles and corresponding first RS EPRE (uplink reference signal) changes;
obtaining a plurality of first curves of the terminal at different test angles according to the first throughput change and the first RS EPRE change;
and averaging the plurality of first curves to obtain a second curve, wherein the second curve is used for representing the first measurement result.
4. The method of claim 1, wherein determining the second measurement comprises:
mapping according to a first uplink signal sent by the terminal to obtain a second downlink signal;
receiving second feedback information sent by the terminal, wherein the second feedback information is information fed back by the terminal according to the second downlink signal;
and determining the second measurement result according to second feedback information of the second downlink signal received by the terminal.
5. The method according to claim 4, wherein the determining the second measurement result according to the feedback information of the second downlink signal received by the terminal comprises:
reducing the power of the second downlink signal under the condition of ensuring that the terminal is not disconnected;
according to the ACK information and/or NACK information in the second feedback information, second throughput changes of the terminal at different testing angles and corresponding second RS EPRE changes are counted;
obtaining a plurality of third curves of the terminal at different test angles according to the second throughput change and the second RS EPRE change;
and averaging the plurality of third curves to obtain a fourth curve, wherein the fourth curve is used for representing the second measurement result.
6. The method of claim 4, wherein the mapping to obtain the second downlink signal according to the first uplink signal sent by the terminal comprises:
receiving a second uplink signal, wherein the second uplink signal is obtained by adding channel attenuation into the first uplink signal sent by the terminal through a channel simulator;
sampling the second uplink signal to obtain the relevant information of a Physical Uplink Shared Channel (PUSCH) of the second uplink signal;
mapping the second uplink signal to a Physical Downlink Shared Channel (PDSCH) according to the relevant information to obtain a third downlink signal;
and sending the third downlink signal to the channel simulator, and adding channel attenuation into the third downlink signal by the channel simulator to obtain the second downlink signal.
7. The method of claim 1, wherein the determining the indicator of uplink MIMO performance of the terminal according to the first measurement result and the second measurement result comprises:
calculating the difference value of the RS EPRE corresponding to the same throughput of the first measurement result and the second measurement result;
and determining the difference value of the RS EPRE as an index of the uplink MIMO performance of the terminal.
8. A base station simulator, comprising: a transceiver and a processor, wherein,
the processor is configured to determine a first measurement result, where the first measurement result represents a corresponding relationship between measured downlink throughput of the terminal and unit energy per resource RS EPRE of a reference signal of the terminal;
the processor is further configured to determine a second measurement result, where the second measurement result indicates a corresponding relationship between the uplink and downlink overall throughput of the terminal and the RS EPRE of the terminal;
the processor is further configured to determine an indicator of uplink multiple-input multiple-output (MIMO) performance of the terminal according to the first measurement result and the second measurement result.
9. The base station simulator of claim 8,
the transceiver is used for transmitting a first downlink signal to the terminal;
the transceiver is further configured to receive first feedback information sent by the terminal, where the first feedback information is information fed back by the terminal according to the first downlink signal;
the processor is further configured to determine the first measurement result according to the first feedback information.
10. The base station simulator of claim 9,
the processor is further configured to reduce the power of the first downlink signal under the condition that it is ensured that the terminal is not disconnected;
the processor is further configured to count first throughput changes of the terminal at different test angles and corresponding first RS EPRE changes according to acknowledgement ACK information and/or negative acknowledgement NACK information in the first feedback information;
the processor is further configured to obtain a plurality of first curves of the terminal at different test angles according to the first throughput change and the first RS EPRE change;
the processor is further configured to average the plurality of first curves to obtain a second curve, where the second curve is used to represent the first measurement result.
11. The base station simulator of claim 8,
the processor is further configured to map a first uplink signal sent by the terminal to obtain a second downlink signal;
the transceiver is further configured to receive second feedback information sent by the terminal, where the second feedback information is information fed back by the terminal according to the second downlink signal;
the processor is further configured to determine the second measurement result according to the second feedback information.
12. The base station simulator of claim 11,
the processor is further configured to reduce the power of the second downlink signal under the condition that it is ensured that the terminal is not disconnected;
the processor is further configured to count second throughput changes of the terminal at different test angles and corresponding second RS EPRE changes according to ACK information and/or NACK information in the second feedback information;
the processor is further configured to obtain a plurality of third curves of the terminal at different test angles according to the second throughput change and the second RS EPRE change;
the processor is further configured to average the plurality of third curves to obtain a fourth curve, where the fourth curve is used to represent the second measurement result.
13. The base station simulator of claim 11,
the transceiver is further configured to receive a second uplink signal, where the second uplink signal is obtained by adding channel fading to the first uplink signal sent by the terminal through a channel simulator;
the processor is further configured to sample the second uplink signal to obtain relevant information of a Physical Uplink Shared Channel (PUSCH) of the second uplink signal;
the processor is further configured to map the second uplink signal to a Physical Downlink Shared Channel (PDSCH) according to the relevant information, so as to obtain a third downlink signal;
the transceiver is further configured to send the third downlink signal to the channel simulator, and the channel simulator adds channel attenuation to the third downlink signal to obtain the second downlink signal.
14. The base station simulator of claim 8,
the processor is further configured to calculate a difference between the RS EPRE corresponding to the same throughput of the first measurement result and the second measurement result;
and the processor is further used for determining the difference value of the RS EPRE as an index of the uplink MIMO performance of the terminal.
15. A terminal test system, comprising: a channel emulator and a base station simulator as claimed in any one of claims 8 to 14.
16. A base station simulator comprising a processor, a memory and a program stored on the memory and executable on the processor, the program when executed by the processor implementing the steps of the terminal testing method according to any one of claims 1 to 7.
17. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the steps of the terminal testing method according to any one of claims 1 to 7.
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