CN114024629B - Method for testing error rate of receiver of wireless communication test system - Google Patents
Method for testing error rate of receiver of wireless communication test system Download PDFInfo
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- CN114024629B CN114024629B CN202111281016.0A CN202111281016A CN114024629B CN 114024629 B CN114024629 B CN 114024629B CN 202111281016 A CN202111281016 A CN 202111281016A CN 114024629 B CN114024629 B CN 114024629B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/29—Performance testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
- H04L1/203—Details of error rate determination, e.g. BER, FER or WER
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a method for testing the error rate of a receiver of a wireless communication test system, which can test the error rate under the condition of not depending on a return channel based on an outer loop link constructed artificially. Comprising the following steps: forward error correction code encoding is carried out on a forward link frame in the test instrument by a forward frame number, forward information source data is used as a pseudo-random sequence, CRC check codes are used for checking the forward frame number and the forward information source data, scrambling is carried out after framing is finished, and signals are sent to the communication equipment to be tested by the forward link of the test instrument; the communication equipment to be tested demodulates a source data frame after receiving a signal sent by a forward link, adds an outer ring frame number and an outer ring CRC check code to form an outer ring link frame, and sends the outer ring link frame to a test instrument through an outer ring link; and after receiving the outer loop link frame, the test instrument calculates the outer loop link frame loss and the forward link frame loss.
Description
Technical Field
The invention belongs to the technical field of wireless communication measurement, and relates to a method for testing the error rate of a receiver of a wireless communication test system, which is suitable for testing the performance of the receiver of a terminal by adopting the error rate in the wireless communication test system.
Background
The wireless communication test system generally tests the performance of the terminal, and for the performance of the transmitter, performance indexes such as signal vector amplitude error, occupied bandwidth, transmitting power and the like are generally adopted for measurement; for receiver performance, bit error rate indicators under various signal conditions are mainly used for measurement at present. Because of the diversity of the communication terminals, different test systems generally adopt different bit error rate test schemes, and the advantages and disadvantages of the test schemes directly affect the accuracy of test results, the adoption of a proper bit error rate test scheme is particularly important for the test systems.
In the communication system with symmetrical (same or a certain multiple relation) air interface physical channel rate, the test instrument and the communication equipment to be tested adopt the same channel for bidirectional communication, namely after the test instrument sends forward data to the receiver of the communication equipment to be tested through a certain channel, the communication equipment to be tested uses a transmitter to send return data back to the test instrument through the same channel. This causes a problem that if the test meter receives erroneous return data due to instability of the transmitter or return channel of the communication device under test, the result should not be used as a basis for measuring the performance index of the receiver of the communication device under test. In order to solve the phenomenon, the traditional solution is to adopt a mode that the tested communication equipment adds a cyclic check code to the return data, so that a test instrument can judge whether the error data is caused by the return channel. However, if the stability of the backward channel is poor, which leads to multiple errors of data and even errors of the cyclic check code, the test flow is necessarily affected. In addition, some unidirectional channels with unidirectional links only, or symmetrical channels with inconsistent forward channel rates and reverse channel rates, are not suitable for the traditional solutions.
In the prior art, a scheme based on the error rate of the outer loop link is proposed, which is applicable to an asymmetric channel and is also used for replacing a return channel under the condition of unstable channel environment. The communication between the test instrument and the communication equipment to be tested adopts two different channels, namely, the transmission flow of forward data from the test instrument to the communication equipment to be tested is consistent with that of normal communication, an actual forward channel is adopted, but when the communication equipment to be tested transmits return data to the test instrument, another more stable link, namely, an outer loop link, is adopted, and the link can be artificially constructed and can avoid data errors caused by instability of the return channel. But the outer loop link is at least stable and reliable, high-speed and convenient for maintenance. The outer loop link is more stable and reliable than the forward channel of the bit error rate test, so that the return data can be guaranteed to be transmitted back without errors; the outer loop link must support a higher data rate to ensure that the return data is received and processed in time; the outer loop link is convenient to maintain, and can be rapidly positioned and restored when an abnormality occurs.
Disclosure of Invention
The invention aims to provide a method for testing the error rate of a receiver of a wireless communication test system, which can test the error rate under the condition of not depending on a return channel based on an artificially constructed outer loop link.
The invention is realized by the following technical scheme.
A method for testing the error rate of a receiver of a wireless communication test system comprises the following steps:
forward error correction code encoding is carried out on a forward link frame in the test instrument by a forward frame number, forward information source data is used as a pseudo-random sequence, CRC check codes are used for checking the forward frame number and the forward information source data, scrambling is carried out after framing is finished, and signals are sent to the communication equipment to be tested by the forward link of the test instrument;
the communication equipment to be tested receives the signal sent by the forward link, demodulates a source data frame, adds an outer ring frame number and an outer ring CRC check code to form an outer ring link frame, constructs an outer ring link between a test instrument and a communication social security to be tested through a universal interface, and sends the outer ring link frame to the test instrument through the outer ring link;
and after receiving the outer loop link frame, the test instrument calculates the outer loop link frame loss and the forward link frame loss.
The invention has the beneficial effects that:
the outer loop link constructed by the invention does not depend on a return channel, the universal interface can meet the requirements of data rate and stability, the universality is very strong, and the method is applicable to bit error rate tests under symmetric channels and asymmetric channels. Meanwhile, through the frame format design of the forward data frame and the outer ring data frame and the error code statistics scheme of the test instrument, the forward frame loss and the outer ring frame loss can be effectively distinguished, and the feasibility of the error code rate index is high.
Drawings
Fig. 1 is a flowchart of a method for counting frame loss of an outer loop link and frame loss of a forward link in an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The implementation principle of the invention is as follows: the test instrument and the communication equipment to be tested have the processing capacity of a forward channel link, and the test instrument and the communication equipment to be tested are connected through an air interface to perform normal communication of a forward channel; the test instrument is connected with the communication equipment to be tested through a serial port or a network port to construct an outer loop link; the communication equipment to be tested has a test mode, and the processed forward channel data can be sent to a test instrument through an outer loop link; the test meter has the capability of receiving the outer loop link data.
The method for testing the error rate of the receiver of the wireless communication testing system in the specific embodiment specifically comprises the following steps:
step 1, forward error correction code encoding is carried out on a forward link frame in a test instrument by a forward frame number, forward information source data is used as a pseudo-random sequence, CRC check codes are used for checking the forward frame number and the forward information source data, scrambling is carried out after framing is finished, and signals are sent to tested communication equipment by a forward link of the test instrument;
step 2, the communication equipment to be tested demodulates the information source data frame after receiving the signal sent by the forward link, adds the outer ring frame number and the outer ring CRC check code to form an outer ring link frame, and sends the outer ring link frame to a test instrument through the outer ring link;
in this embodiment, the outer loop link frame format is sequentially: outer loop frame number, forward source data, CRC check code, outer loop CRC check code. The outer ring frame number is used for numbering the forward link frames received by the communication equipment to be tested; the CRC check code is used for the outer loop frame number and the entire forward link frame.
Step three, after the test instrument receives the outer loop link frame, counting the outer loop link frame loss and the forward link frame loss;
in the implementation, the frame loss of the outer loop is not caused by the demodulation error of the forward link of the tested communication equipment, so that the final error code result is not counted, and the frame loss of the forward link needs to count the error code result.
In this embodiment, as shown in fig. 1, the test meter counts the frame loss of the outer loop link and the frame loss of the forward link, which are specifically as follows:
the method comprises the steps that 1, an outer ring frame number N and a forward frame number L of an outer ring link data frame which is tested are recorded, after a test instrument receives the data frame of the outer ring link, the data frame is checked through an outer ring CRC check code, if the check fails, the frame is invalidated, result statistics is not counted, the upper frame outer ring frame number N is automatically added with 1, the forward frame number L is automatically added with 1, and if the check succeeds, the outer ring lost frame number calculation in the step 2 is carried out;
step 2, analyzing the outer ring data frame successfully checked, setting the frame number as N, recording N-N=x, judging whether x is equal to 1, and if x=1, the outer ring frame loss number is equal to 0; otherwise, the outer ring frame loss number is equal to x-1; after the outer ring frame loss number is calculated, updating the outer ring frame number N and the forward frame number L of the last frame;
step 3, performing CRC check on the forward link frame, if the check is successful, analyzing the forward frame number, and setting the forward frame number as L, so as to obtain a forward lost frame y=l-L, wherein the error code number e=0 of the frame; if the verification fails, analyzing a forward frame number L through a forward error correction code, calculating a forward frame loss number y=l-L, at the moment, comparing the frame data with data of a corresponding frame number sent by a test instrument, and counting an error code number e;
step 4, calculating the total error code number equal to the forward frame loss number multiplied by the frame length plus the error code number e;
step 5, judging whether the tested forward frame number L is greater than the total frame number to be tested after the outer ring frame number N and the forward frame number L of the previous frame are respectively added with 1, and stopping the test if the tested forward frame number L is greater than the total frame number to be tested; otherwise, the next round of testing is carried out.
The test instrument for the test method comprises a forward link processing module, a forward data frame module and an error code statistics module; the forward data frame module is connected with the forward link processing module, the forward link processing module is connected with the forward link frame module of the communication equipment to be tested, and the error code statistics module is connected with the outer loop link frame module of the communication equipment to be tested;
the forward data frame module generates a pseudo-random sequence as an information source data part, the frame number of the frame is used as a forward link frame number by performing BCH coding, a CRC (cyclic redundancy check) check code is added and then the forward link frame is sent to the forward link processing module, and the forward link processing module processes the pseudo-random sequence and then sends the pseudo-random sequence to the forward link frame module of the tested communication equipment by a radio frequency line; the forward link processing module of the tested communication equipment demodulates the data frame, sends the data frame into the outer loop link frame module, adds the outer loop frame number and the CRC check code, completes the framing of the outer loop link frame, and sends the framed data to the error code statistics module of the test instrument through the outer loop link; and the error code statistics module calculates the error code rate and completes the error code rate test under the asymmetric channel.
The foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A method for testing the error rate of a receiver of a wireless communication test system, comprising:
forward error correction code encoding is carried out on forward frame numbers of forward link frames in the test instrument, forward information source data is used as a pseudo-random sequence, CRC check codes are used for checking the forward frame numbers and the forward information source data to complete framing, and signals are sent to the communication equipment to be tested through a forward link of the test instrument;
the communication equipment to be tested receives the signal sent by the forward link, demodulates the signal source data frame, adds the outer ring frame number and the outer ring CRC check code to form an outer ring link frame, constructs an outer ring link between the test instrument and the communication equipment to be tested through a universal interface, and sends the outer ring link frame to the test instrument through the outer ring link;
after receiving the outer loop link frame, the test instrument calculates the outer loop link frame loss and the forward link frame loss, and the method specifically comprises the following steps:
the method comprises the steps that 1, an outer ring frame number N and a forward frame number L of an outer ring link data frame which is tested are recorded, after a test instrument receives the data frame of the outer ring link, the data frame is checked through an outer ring CRC check code, if the check fails, the frame is invalidated, result statistics is not counted, the upper frame outer ring frame number N is automatically added with 1, the forward frame number L is automatically added with 1, and if the check succeeds, the outer ring lost frame number calculation in the step 2 is carried out;
step 2, analyzing the outer ring data frame successfully checked, setting the frame number as N, recording N-N=x, judging whether x is equal to 1, and if x=1, the outer ring frame loss number is equal to 0; otherwise, the outer ring frame loss number is equal to x-1; after the outer ring frame loss number is calculated, updating the outer ring frame number N and the forward frame number L of the last frame;
step 3, performing CRC check on the forward link frame, if the check is successful, analyzing the forward frame number, and setting the forward frame number as L, so as to obtain a forward lost frame y=l-L, wherein the error code number e=0 of the frame; if the verification fails, analyzing a forward frame number L through a forward error correction code, calculating a forward frame loss number y=l-L, at the moment, comparing the frame data with data of a corresponding frame number sent by a test instrument, and counting an error code number e;
step 4, calculating the total error code number equal to the forward frame loss number multiplied by the frame length plus the error code number e;
step 5, judging whether the tested forward frame number L is greater than the total frame number to be tested after the outer ring frame number N and the forward frame number L of the previous frame are respectively added with 1, and stopping the test if the tested forward frame number L is greater than the total frame number to be tested; otherwise, the next round of testing is carried out.
2. The method for testing the error rate of a receiver of a wireless communication test system according to claim 1, wherein the forward link frame format is, in order: forward frame number, forward source data, CRC check code.
3. The method for testing the error rate of a receiver of a wireless communication testing system according to claim 1 or 2, wherein the frame format of the outer loop link is in turn: outer loop frame number, forward source data, CRC check code, outer loop CRC check code.
4. A test meter for use in the test method of claim 1 or 2, comprising a forward link processing module, a forward data frame module, and an error statistics module; the forward data frame module is connected with the forward link processing module, the forward link processing module is connected with the forward link frame module of the communication equipment to be tested, and the error code statistics module is connected with the outer loop link frame module of the communication equipment to be tested; the forward data frame module generates a pseudo-random sequence as an information source data part, the frame number of the frame is used as a forward link frame number by performing BCH coding, a CRC (cyclic redundancy check) check code is added and then the forward link frame is sent to the forward link processing module, and the forward link processing module processes the pseudo-random sequence and then sends the pseudo-random sequence to the forward link frame module of the tested communication equipment by a radio frequency line; the forward link processing module of the tested communication equipment demodulates the data frame, sends the data frame into the outer loop link frame module, adds the outer loop frame number and the CRC check code, completes the framing of the outer loop link frame, and sends the framed data to the error code statistics module of the test instrument through the outer loop link; and the error code statistics module calculates the error code rate and completes the error code rate test under the asymmetric channel.
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