5g network anti-interference test method and system based on radio frequency coverage interference

Abstract

A 5G network interference test method and system based on radio frequency coverage interference, the system comprising a legal transmitting device, a receiving device to be tested and a radio frequency interference device; the radio frequency interference device implements various different types of interference, including but not limited to continuous interference, reactive interference, random / periodic interference, synchronous radio frequency coverage interference, etc. The present application realizes radio frequency coverage interference, including time-frequency synchronization, interference subframe generation and interference subframe transmission. The legal transmitting device and the receiving device to be tested for anti-interference test collect and store the performance indicators of the 5G network system, such as signal-to-noise ratio, block error rate, data rate, etc. under the interference environment. The present application uses radio frequency coverage interference to evaluate the ultimate anti-interference performance of 5G devices, and the interference means provided is advanced, can simulate the targeted interference received by 5G devices in real scenarios, and test the anti-interference performance of the device under new radio frequency coverage interference.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wireless communication and the field of wireless network security, in particular to a 5G network anti-interference test method and system based on radio frequency coverage interference. BACKGROUND

[0002] At present, cellular mobile communication technology has been widely used in all aspects of social production and people's life. The fifth generation mobile communication technology (5th Generation Mobile Networks, referred to as 5G or 5G technology) is the latest generation of cellular mobile communication technology, which is an extension of 2G (GSM), 3G (UMTS) and 4G (LTE) systems. The performance goals of 5G are high data rate, reduced latency, energy saving, cost reduction, increased system capacity and large-scale device connection. Anti-interference is one of the important characteristics of 5G network, which guarantees the reliability and performance of the network. However, in actual deployment and application, 5G devices will face various interference sources, including but not limited to signal interference of other wireless devices, and even malicious attackers will launch targeted interference against target devices. These interferences may cause signal attenuation, transmission errors, connection interruptions and other problems, which will affect the communication quality and experience of users. Therefore, it is crucial for 5G devices to have good anti-interference performance. By testing the anti-interference performance of the device, interference problems can be identified and solved, and the design and algorithm of the device can be improved to improve the robustness and reliability of the network.

[0003] Using radio frequency coverage interference technology, the anti-interference performance limit of wireless communication network can be tested. Among the interference of 5G wireless communication network, the first to be mentioned is the traditional jammer. With enough output power, the traditional jammer can always interfere with communication by emitting noise. However, using traditional noise jammer usually requires high-cost, high-energy hardware, and the range of influence is usually small, and the interference behavior is easy to be detected.

[0004] The radio frequency coverage interference relied on by the present application is a targeted interference technology with the potential to achieve lower power and higher concealment. SUMMARY

[0005] In order to better test the anti-interference performance of 5G network, the present application proposes a 5G network anti-interference test method and system based on radio frequency coverage interference, relying on radio frequency coverage interference technology, which can not only achieve effective interference effect with lower power, but also can be tested without being easily detected, which opens up a new way for precise evaluation of the anti-interference ability of 5G network, optimization of device design and algorithm, and further improvement of the robustness and reliability of the network.

[0006] The technical solution of the present application is as follows:

[0007] In one aspect, the application provides a 5G network interference test method based on radio frequency coverage interference, characterized in that it comprises the following steps:

[0008] Step 1. Start the legal transmitting device, configure the transmitting parameters, including the transmitting gain, transmitting frequency band, ARFCN, subcarrier spacing, channel bandwidth, cyclic prefix, physical cell ID, and continuously transmit the downlink broadcast signal and synchronization signal;

[0009] Step 2. Start the receiving device to be tested, configure the receiving parameters, including the receiving gain, receiving frequency band, ARFCN, sampling rate, APN, and perform the initial random access process to finally establish a connection with the legal transmitting device;

[0010] Step 3. In a normal communication environment, the receiving device collects communication quality indicators, including signal-to-noise ratio, block error rate, and data rate, as baseline indicators;

[0011] Step 4. Start the radio frequency interference device, synchronize time and frequency by receiving the synchronization signal of the legal transmitting device;

[0012] Step 5. The radio frequency interference device calculates the accurate time of transmitting interference subframes according to the information obtained in step 4, and transmits coverage interference signals at specific subframe times;

[0013] Step 6. In an interference communication environment, the receiving device collects communication indicators, including signal-to-noise ratio, block error rate, and data rate, and compares and analyzes them with the baseline indicators obtained in step 3 to obtain the anti-interference performance of the receiving device under radio frequency coverage interference;

[0014] Step 7. Analyze the interference effect, adjust the interference parameters according to the interference test results, and perform further tests, wherein after each test, the receiving device to be tested needs to be restarted in step 2, or the receiving device to be tested is started during interference execution to test the impact of interference on the normal startup and initial access of the receiving device.

[0015] Further, in step 4, the radio frequency interference device synchronizes time and frequency with the legal transmitting device, and the specific steps are as follows:

[0016] The radio frequency coverage interference device receives the synchronization sequence transmitted by the legal transmitting device for synchronization sequence detection;

[0017] Calculate the cross-correlation of the received sequence and the standard synchronization sequence, convert the synchronization sequence from the time domain to the frequency domain through discrete Fourier transform, multiply them in the frequency domain, and then inverse transform to the time domain to obtain the cross-correlation result;

[0018] According to the index k0 where the peak value is found in the cross-correlation result, the start of the synchronization sequence in the actual received sample is determined, and preliminary synchronization with the frame is achieved;

[0019] The accurate position of the synchronization signal block (SSB) is obtained, so as to obtain the subframe timing and the physical cell ID in the SSB;

[0020] The current frame number is read from the master information block (MIB), and the information of the frame and the subframe sequence is obtained.

[0021] Further, in step 5, according to the obtained information, the accurate time of transmitting the interference subframe is calculated, and the interference signal subframe is transmitted at a specific subframe time, and the specific steps are as follows:

[0022] Generating an interference signal subframe: for the target subframe, tampering with specific key fields, and then performing the corresponding encoding process to generate the interference subframe;

[0023] Calculating the time T of transmitting the interference signal subframe tx =T rx +T offset -T adv , wherein T rx is the current time, T offset is the offset of the target subframe to the current time, T adv =n adv / srate is the time of the software and hardware sampling advance;

[0024] The interference signal subframe synchronized with the legal transmitting device is transmitted at a specific subframe time with a power slightly higher than that of the legal transmitting device.

[0025] On the other hand, the present application also provides a 5G network interference test system based on radio frequency coverage interference, characterized in that it comprises:

[0026] A legal transmitting device for configuring transmission parameters and continuously transmitting downlink broadcast signals and synchronization signals;

[0027] A to-be-tested receiving device for configuring receiving parameters and performing an initial random access process, and finally establishing a connection with the legal transmitting device;

[0028] A radio frequency interference device for receiving the synchronization signals of the legal transmitting device for time and frequency synchronization, and calculating the accurate time of transmitting the interference subframe according to the synchronization information, and transmitting the coverage interference signal at a specific subframe time;

[0029] The radio frequency interference device is synchronized with the legal transmitting device, and can transmit the interference signal subframe at a specific subframe time with a power slightly higher than that of the legal transmitting device, and the to-be-tested receiving device is used to collect the communication quality indicators in normal communication environment and interference environment, and to compare and analyze to obtain the anti-interference performance.

[0030] Further, the radio frequency interference device further comprises a module for calculating the cross-correlation of the received sequence and the standard synchronization sequence, which realizes the conversion from time domain to frequency domain through discrete Fourier transform, and then inversely transforms to time domain to obtain the cross-correlation result.

[0031] Further, the radio frequency interference device further comprises a module for generating an interference signal subframe, which generates the interference signal subframe by tampering with a specific key field of the target subframe and performing the corresponding encoding process.

[0032] The present application is also compatible with various conventional interference, including traditional continuous interference, reactive interference, periodic interference, etc., for more comprehensive interference testing. Steps 4 to 5 are replaced by conventional interference means, so as to test the anti-interference performance of the device under conventional interference.

[0033] Compared with the prior art, the present application has the following advantages:

[0034] 1) A new 5G interference test system architecture based on software defined radio technology (SDR) is proposed, which integrates a legal transmitting device (5G base station), a receiving device to be tested (5G user equipment) and a radio frequency interference device, and realizes flexible communication and interference test between users, base stations and core networks through software driven mode. Traditional 5G interference test system often relies on fixed configuration of hardware devices, which lacks flexibility and scalability. By introducing SDR technology, the system can be flexibly configured and reconstructed at the software level according to different test requirements, thereby significantly improving the test efficiency and accuracy. The interference means provided by the system of the present application is advanced, which can simulate the targeted interference received by 5G devices in real scenarios, and test the anti-interference performance of the device under new radio frequency coverage interference. The radio frequency interference device demodulates the unencrypted public channels (synchronization signals, broadcast channels, etc.) of the base station to realize accurate alignment of sampling points and frequency points with the base station, and obtain the time information (frame number, subframe number, etc.) of the base station. Since the broadcast channel is not integrity protected, the coverage interference end can tamper with a certain specific broadcast channel subframe, and only needs to slightly increase the transmission power to cover the original signal.

[0035] 2) The time and frequency synchronization method between the radio frequency interference device and the legal transmitting device is adopted, the synchronization signal of the legal transmitting device is received, and the cross-correlation calculation is carried out by using mathematical tools such as discrete Fourier transform, so as to realize the analysis and processing of the synchronization signal, thereby realizing accurate synchronization and improving the accuracy and stability of the synchronization.

[0036] 3) The interference signal subframe generation and transmission method is adopted. By tampering with the specific key field (such as 5G MIB key bit) of the legal transmission equipment and performing the corresponding encoding process, an interference signal subframe is generated which is synchronized with the legal signal but the content is tampered with. It can more realistically simulate the interference situation in the actual communication environment, thereby significantly improving the accuracy and practicality of the test.

[0037] 4) Not only supports the test method based on radio frequency coverage interference, but also compatible with a variety of conventional interference (such as continuous interference, reactive interference, periodic interference, etc.), for more comprehensive interference test. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is the running flow chart of the 5G interference test system based on radio frequency coverage interference of the present application.

[0039] Figure 2 is a schematic diagram of radio frequency coverage interference. DETAILED DESCRIPTION

[0040] The present application will be further explained in conjunction with the drawings and examples, but should not be limited to the protection scope of the present application.

[0041] The present application is a 5G interference test method and system based on radio frequency coverage interference. The system aims to evaluate the anti-interference performance of 5G user equipment (UE) in an interference environment by simulating radio frequency interference. The entire system is composed of three types of core equipment: legal transmitting equipment (i.e. 5G base station), receiving equipment to be tested (i.e. 5G user equipment) and radio frequency interference equipment. Based on the software-defined radio technology 5G network platform, the user and the base station are connected by wireless means, the base station and the core network are connected by wired means, and the core network is connected with the Internet. The user, the base station and the core network in the system all use software drivers and can run on an operating system based on the Linux kernel. The user and the base station realize the transmission and reception of signals through wireless radio frequency equipment, which is realized by third-party platforms such as USRP. The following is a detailed explanation of each step and key technology:

[0042] The system includes:

[0043] Legal transmitting equipment: as a 5G base station, responsible for transmitting downlink broadcast signals and synchronization signals so that user equipment can access the network.

[0044] Receiving equipment to be tested: as a 5G user equipment, responsible for receiving signals from the base station and evaluating the communication quality in normal and interference environment.

[0045] Radio frequency interference equipment: responsible for simulating radio frequency interference, time and frequency synchronization with the base station, and transmitting interference signals at a specific time.

[0046] A 5G interference test method based on radio frequency coverage interference, comprising the following steps:

[0047] Step 1. Start the legal transmitting device (usually a 5G base station).

[0048] (1-1) The transmitting device performs parameter configuration, including transmitting gain (70 dB), transmitting frequency band, ARFCN (band 3, 368500), subcarrier spacing (15 kHz), channel bandwidth (10 MHz), cyclic prefix, physical cell ID, and other key information.

[0049] (1-2) The transmitting device reads the configuration and starts, continuously transmitting downlink broadcast signals and synchronization signals.

[0050] Step 2. Start the receiving device under test (usually a 5G terminal device).

[0051] (2-1) The receiving device performs parameter configuration, including receiving gain (70 dB), receiving frequency band, ARFCN (band 3, 368500), sampling rate (11.52 MHz), USIM related parameters (K, OPC, IMSI, IMEI, etc.), APN, and other key information.

[0052] (2-2) The receiving device reads the configuration and starts, under normal circumstances, the receiving end starts the initial random access process and finally establishes a connection with the transmitting device.

[0053] Step 3. The receiving device under test collects communication quality indicators in a normal communication environment, including signal-to-noise ratio, block error rate, data rate, etc., as baseline indicators.

[0054] Step 4. Start the radio frequency interference device and synchronize with the legal transmitting device in time and frequency. The specific steps are as follows:

[0055] (4-1) The radio frequency coverage interference device receives the synchronization signal y[n] transmitted by the legal transmitting device for synchronization sequence detection;

[0056] (4-2) Calculate the cross-correlation of the received sequence and the standard synchronization sequence. Use discrete Fourier transform to convert the synchronization sequence from time domain y[n] to frequency domain Y[f] = FFT(y[n]). Let the time domain synchronization sequence with root sequence index u be s u [n], and convert it to frequency domain S u [f] = FFT(s u [n]). The cross-correlation of signal samples with offset k and the conjugate of the standard synchronization sequence can be written as (N is the sequence length), which in the frequency domain is the multiplication of the two, Inverse transform to time domain, the cross-correlation z[k] = IFFT(Z[f]) can be obtained.

[0057] (4-3) Find the index k0 of the peak value in all cross-correlations z[k], which is the starting point of the synchronization sequence in the actual received sample. Thus, the preliminary synchronization information required is obtained, and preliminary synchronization with the frame is achieved.

[0058] (4-4) After successfully detecting the synchronization frame timing through the synchronization sequence, the precise position of the synchronization signal block (SSB) can be obtained, so as to obtain the subframe timing and physical cell ID in the SSB.

[0059] (4-5) Read the current frame number from the master information block (MIB) and further obtain the information of the frame and subframe sequence, such as system information parameters such as subCarrierSpacingCommon, dmrs-TypeA-Position, pdcch-ConfigSIB1, cellBarred, etc.

[0060] Step 5. The radio frequency interference device calculates the accurate time of transmitting the interference subframe according to the synchronization information obtained in step 4, and transmits the cover interference signal at a specific subframe time. The specific steps are as follows:

[0061] (5-1) Generate an interference signal subframe. For the target subframe, tamper with the specific key field, and then perform the corresponding encoding process to generate the interference subframe. In this embodiment, the radio frequency interference device tampers with the key bit of the 5G MIB of the base station (such as cellBarred or infraFreqReselection), or modifies pchch-ConfigSib1, and performs the corresponding PBCH encoding process.

[0062] (5-2) Calculate the precise time T tx of transmitting the interference signal subframe rx T ofset -T adv , T rx is the current time, T offset is the offset of the target subframe to the current time, and the target subframe is usually the current subframe of the next frame, i.e. 10ms, T adv = n adv / srate, which corresponds to the time of the soft and hardware sampling advance, and is equal to 5.729μs.

[0063] (5-3) The radio frequency interference device transmits the interference signal subframe synchronized with the legal transmitting device, i.e. the PBCH symbol generated in step 5-1, at a specific subframe time with a power slightly higher than that of the legal transmitting device by about 3dB.

[0064] Step 6. The receiving device under test collects communication indicators under interference, including signal-to-noise ratio, block error rate, data rate, etc. Compare and analyze the baseline indicators in the normal communication environment to obtain the anti-interference performance of the receiving device under radio frequency coverage interference.

[0065] Step 7. Analyze the interference effect, adjust the interference parameters such as the power of radio frequency interference and tampered bit fields according to the interference test results, and perform further tests. After each test, step 2 needs to be re-executed to start the receiving end under test for the next test. The receiving end under test can also be started during interference execution to test whether the interference affects the normal start and initial access of the receiving end. Step 1 can be optionally re-executed before step 2 is re-executed.

[0066] The present application is also compatible with various conventional interference, including traditional continuous interference, reactive interference, periodic interference, etc. for more comprehensive interference testing. Steps 4 to 5 are replaced by conventional interference means to test the anti-interference performance of the device under conventional interference.

[0067] Finally, the results of a series of tests previously made are evaluated to obtain the anti-interference performance of the receiving device under test under radio frequency coverage interference and conventional interference.

[0068] The present application provides an efficient and flexible 5G interference test method and system, which can comprehensively evaluate the anti-interference performance of 5G user equipment in an interference environment, and provide strong support for the optimization and upgrading of 5G networks.

Claims

1. A method for testing interference of a 5G network based on radio frequency coverage interference, characterized in that, The method comprises the following steps: Step 1. Start the legal transmitting device, configure the transmitting parameters, including the transmitting gain, the transmitting frequency band, the ARFCN, the subcarrier spacing, the channel bandwidth, the cyclic prefix, the physical cell ID, and continuously transmit the downlink broadcast signal and the synchronization signal; Step 2. Start the receiving device to be tested, configure the receiving parameters, including the receiving gain, the receiving frequency band, the ARFCN, the sampling rate, the APN, and perform the initial random access process to finally establish the connection with the legal transmitting device; Step 3. In the normal communication environment, the receiving device collects the communication quality indicators, including the signal-to-noise ratio, the block error rate and the data rate, as the baseline indicators; Step 4. Start the radio frequency interference device, synchronize the time and frequency by receiving the synchronization signal of the legal transmitting device; Step 5. According to the information obtained in step 4, the radio frequency interference device calculates the accurate time of transmitting the interference subframe and transmits the covering interference signal at the specific subframe time; in step 5, according to the obtained information, the accurate time of transmitting the interference subframe is calculated, and the covering interference signal is transmitted at the specific subframe time, and the specific steps are as follows: Generate the interference signal subframe: for the target subframe, tamper with the specific key field, and then perform the corresponding encoding process to generate the interference subframe; Time T to transmit the jamming signal subframe is calculated tx = T rx + T offset - T adv where T rx is the current time, T offset is the offset of the target subframe from the current time; T adv is the time of the soft and hardware sampling advance Transmit the interference signal subframe synchronized with the legal transmitting device at the specific subframe time with a power slightly higher than that of the legal transmitting device; Step 6. In the interference communication environment, the receiving device collects the communication indicators, including the signal-to-noise ratio, the block error rate and the data rate, and compares and analyzes them with the baseline indicators obtained in step 3 to obtain the anti-interference performance of the receiving device under the radio frequency covering interference; Step 7. Analyze the interference effect, adjust the interference parameters according to the interference test results, and perform further tests, wherein after each test, the receiving device to be tested needs to be restarted in step 2, or the receiving device to be tested is started during the interference execution to test the influence of the interference on the normal start and initial access of the receiving device.

2. The method of claim 1, wherein the 5G network interference test is based on radio frequency coverage interference. In step 4, the radio frequency interference device is started, and the time and frequency are synchronized with the legal transmitting device, and the specific steps are as follows: The radio frequency covering interference device receives the synchronization sequence transmitted by the legal transmitting device for synchronization sequence detection; Calculate the cross-correlation of the received sequence and the standard synchronization sequence, convert the synchronization sequence from the time domain to the frequency domain through the discrete Fourier transform, and then inverse transform it to the time domain to obtain the cross-correlation result; According to the index k0 where the peak value is found in the cross-correlation result, the start point of the synchronization sequence in the actual received sample is determined, and the preliminary synchronization with the frame is achieved; Obtain the accurate position of the synchronization signal block (SSB) to obtain the subframe timing and the physical cell ID in the SSB; Read the current frame number from the master information block (MIB) and obtain the information of the frame and the subframe sequence.

3. A 5G network interference test system based on radio frequency coverage interference, characterized in that, The method comprises the following steps: The legal transmitting device is used for configuring the transmitting parameters and continuously transmitting the downlink broadcast signal and the synchronization signal; The receiving device to be tested is used for configuring the receiving parameters and performing the initial random access process to finally establish the connection with the legal transmitting device; The radio frequency interference device receives a synchronization signal of a legal transmitting device to synchronize time and frequency, and calculates accurate time of transmitting interference subframes according to the synchronization information, and transmits a cover interference signal at a specific subframe time. According to the obtained information, the accurate time of transmitting interference subframes is calculated, and a cover interference signal is transmitted at a specific subframe time. The specific steps are as follows: Generating an interference signal subframe: for a target subframe, a specific key field is tampered with, and a corresponding encoding process is performed to generate an interference subframe; Time T of transmitting interference signal subframe is calculated tx = T rx + T offset - T adv , wherein T rx is current time, T offset is offset of target subframe to current time; T adv is time of soft and hardware sampling advance Transmitting the interference signal subframe synchronized with the legal transmitting device at a specific subframe time with a power slightly higher than that of the legal transmitting device; The radio frequency interference device is synchronized with the legal transmitting device, can transmit the interference signal subframe at a specific subframe time with a power slightly higher than that of the legal transmitting device, and the receiving device under test is used to collect communication quality indexes in normal communication environment and interference environment, and compare and analyze to obtain anti-interference performance.

4. The 5G network jamming test system based on radio frequency cover jamming according to claim 3, characterized in that, The radio frequency interference device further comprises a module for calculating cross-correlation of the received sequence and the standard synchronization sequence, which realizes fast calculation in the frequency domain through discrete Fourier transform, and inversely transforms to the time domain to obtain the cross-correlation result.

5. The 5G network jamming test system based on radio frequency cover jamming according to claim 3, wherein, The radio frequency interference device further comprises a module for generating an interference signal subframe, which generates the interference signal subframe by tampering with a specific key field of a target subframe and performing a corresponding encoding process.

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