NR signal shielding method and system

Abstract

The invention relates to the technical field of mobile communication, in particular to an NR signal shielding method and system, and the method comprises the steps: collecting an NR base station signal; the PBCH is detected and decoded according to the NR base station signal, and the MIB is obtained; the method comprises the following steps: acquiring information of a control resource set CORESET0 of a physical downlink control channel (PDCCH) according to a pdcch-ConfigSIB1 in an MIB (Management Information Block); and white noise interference signals are transmitted to the time domain and the frequency domain of a physical downlink control channel (PDCCH) CORESET0 according to the information of the control resource set CORESET0. According to the scheme, the interference bandwidth can be determined, the interference effect can be ensured without interfering the full bandwidth, and the requirements of environmental protection are met.

Description

Technical Field

[0001] The present invention relates to the field of mobile communication technology, and in particular to a NR signal shielding method and system. Background Art

[0002] In the 5G communication system, in order to protect the information security of specific places, a shielding system will be used to shield the NR terminals in a certain area, making the NR terminals fail to access the NR base station.

[0003] Although the traditional suppression interference system and the reconstructed SSB sequence interference system can shield the NR signal, they will cause a lot of radiation or waste of resources, which does not meet the requirements of green environmental protection. For this reason, researchers have studied the NR signal shielding method based on random access, such as: Patent Publication No. CN113242608B, the patent name is an invention patent of a NR signal shielding method and system based on random access, which discloses a NR signal shielding method based on random access, including the following contents: S1, collecting NR base station signals; S2, according to the NR base station signal detection and analysis, solve the window period of RAR; the S2 includes: S201, using the NR base station signal which is a digital signal to detect and decode PBCH, and solve MIB; S202, according to the pdcch-ConfigSIB1 in the MIB, obtain the CORESET and SearchSpace of PDCCH; S203, according to the CORESET and SearchS of PDCCH pace collects and decodes PDCCH, and extracts the DCI of PDSCH; S204, collects and decodes PDSCH according to the DCI of PDSCH, extracts SIB1, and according to the general configuration of random access channel RACH-ConfigGereric in SIB1, extracts the window period of RAR, and ra-ResponseWindow in the RACH-ConfigGereric structure is the window period of RAR; S3, when the message Msg1 sent by the NR terminal for RA is collected in the same frequency band of the NR base station signal, a white noise interference signal is sent to the air interface according to the window period of RAR, and the blind detection of PDCCH by the NR terminal during the window period of RAR is interfered. The message Msg1 includes the sequence of RAP and RA-RNTI, which is used for verification and de-scrambling of the subsequent process of random access of the NR terminal. The white noise interference signal adopts a white noise interference signal with increased power, which is increased to different powers according to different coverage radius. This method only interferes with the random access process of the NR terminal and does not transmit any interference signal at other times, so it consumes low power and has high efficiency; and the white noise interference signal only occupies a small amount of time and frequency resources in a specified time period, has low transmission power, does not affect human health, and meets the requirements of green environmental protection.

[0004] Patent CN113242608B does not require periodic interference, but only needs to transmit interference signals within the window period of random access response, which meets the requirements of green environmental protection. However, it needs to parse the SIB1 message to obtain system configuration information, thereby obtaining the access timing of PRACH, and needs to calculate the time-frequency domain resources of PRACH, detect PRACH on the time-frequency domain resources, and after detecting PRACH, interfere with PDSCH with full bandwidth within the random access window time configured by the system.

[0005] In response to the problems existing in the above-mentioned prior art, this solution proposes an NR signal shielding method and system, which can clearly define the interference bandwidth, that is, there is no need to interfere with the full bandwidth, while ensuring the interference effect and meeting the requirements of green environmental protection. Summary of the invention

[0006] One of the purposes of the present invention is to provide a NR signal shielding method that can clearly define the interference bandwidth, that is, it is not necessary to interfere with the full bandwidth, while ensuring the interference effect and meeting the requirements of green environmental protection.

[0007] The present invention provides a basic solution 1: a NR signal shielding method, including the following contents:

[0008] S1, collect NR base station signals;

[0009] S2. Detect and decode PBCH according to the NR base station signal to obtain MIB;

[0010] S3. According to pdcch-ConfigSIB1 in MIB, obtain the information of control resource set CORESET0 of physical downlink control channel PDCCH;

[0011] S4. According to the information of the control resource set CORESET0, a white noise interference signal is transmitted to the time domain and frequency domain of the physical downlink control channel PDCCH CORESET0.

[0012] Further, S1 includes: blindly scanning the NR synchronization frequency grid, and performing down-conversion and analog-to-digital conversion processing.

[0013] Further, S2 includes: searching and saving PBCH DM-RS for 5G NR base station signals, determining SSB index, half-frame indication information, and obtaining half-frame synchronization.

[0014] Furthermore, pdcch-ConfigSIB1 has 8 bits in total, the upper 4 bits correspond to the frequency domain information of CORESET0, and the lower 4 bits correspond to the time domain information of CORESET0;

[0015] Frequency domain information, including: multiplexing mode with SSB, number of RBs, number of symbols, and offset relative to SSB.

[0016] Furthermore, the time domain information is calculated using the following formula:

[0017]

[0018] Where M and O can be obtained according to the configuration, μ∈{0,1,2,3}, and i represents the index of the SSB detected in the half frame.

[0019] The second purpose of the present invention is to provide an NR signal shielding system that can clearly define the interference bandwidth, that is, it does not need to interfere with the full bandwidth, while ensuring the interference effect and meeting the requirements of green environmental protection.

[0020] The present invention provides a second basic solution: an NR signal shielding system, comprising: a data acquisition module, a baseband processing module and a signal sending module;

[0021] Data acquisition module, used to collect NR base station signals and NR terminal signals;

[0022] A baseband processing module is used to detect and decode PBCH according to the NR base station signal, obtain MIB, obtain information of control resource set CORESET0 of physical downlink control channel PDCCH according to pdcch-ConfigSIB1 in MIB, generate an interference signal for interfering with the time domain and frequency domain of physical downlink control channel PDCCH CORESET0 according to the information of control resource set CORESET0, and send it to the signal sending module;

[0023] The signal sending module is used to transmit interference signals.

[0024] Furthermore, the data acquisition module is used to collect NR base station signals and NR terminal signals, including: blind scanning the NR synchronization frequency grid, and performing down-conversion and analog-to-digital conversion processing.

[0025] Further, the baseband processing module includes: a PBCH decoding unit;

[0026] The PBCH decoding unit is used to detect and decode the PBCH according to the NR base station signal and obtain the MIB, including: searching and saving the PBCH DM-RS for the NR base station signal, determining the SSB index and half-frame indication information, and obtaining half-frame synchronization.

[0027] Further, the PDCCH decoding unit is further used to obtain information of a control resource set CORESET0 of a physical downlink control channel PDCCH according to pdcch-ConfigSIB1 in the MIB decoded by the PDCCH decoding unit;

[0028] Among them, pdcch-ConfigSIB1 has a total of 8 bits, the upper 4 bits correspond to the frequency domain information of CORESET0, and the lower 4 bits correspond to the time domain information of CORESET0;

[0029] Frequency domain information, including: multiplexing mode with SSB, number of RBs, number of symbols, and offset relative to SSB;

[0030] The time domain information is calculated using the following formula:

[0031]

[0032] Where M and O can be obtained according to the configuration, μ∈{0,1,2,3}, and i represents the index of the SSB detected in the half frame.

[0033] Furthermore, the baseband processing module further includes: an interference signal generating unit;

[0034] The interference signal generating unit is used to generate a white noise interference signal for interfering with the time domain and frequency domain of the physical downlink control channel PDCCH CORESET0 according to the information of the control resource set CORESET0, and send the signal to the signal sending module.

[0035] Beneficial effect: The prior art needs to obtain the SIB1 message, initiate a random access request according to the cell configuration information carried in the SIB1 message, and interfere with the random access response to prevent the UE from performing uplink synchronization with the gNB. In addition to parsing CORESET0, it is also necessary to blindly detect DCI on CORESET0, parse SIB1, and monitor the random access request initiated by the terminal in the time domain and frequency domain of the PRACH configured in SIB1. During the random access response window period configured in SIB1, interference must be continuously generated. This process belongs to the uplink synchronization process of the terminal, the working path is long, the implementation process is cumbersome, the interference bandwidth is unclear, and the entire initial access bandwidth needs to be interfered with. The interference lasts for a long time, and long-term and large-scale interference will occur in crowded areas, which cannot meet the requirements of green energy saving. However, this solution can clarify the interference bandwidth, does not need to interfere with the full bandwidth, and can calculate the time and frequency domain resources of CORESET0 according to the information configured by pdcch-ConfigSIB1. Only this part of the time and frequency domain resources needs to be interfered with to prevent the UE from completing uplink synchronization with the gNB. This solution belongs to the downlink synchronization process of UE, and has the advantages of clear and small interference range (partial interference RB in the frequency domain can also work normally), short interference duration (even if the first OFDM symbol is interfered, it can still work normally), simple implementation process, and green energy saving requirements;

[0036] This solution only interferes with the NR downlink control channel PDCCH CORESET0, affecting the downlink synchronization process of terminal random access, and does not transmit any interference signals at other times; the interference signal only occupies a small amount of time and frequency resources within a fixed time, has low transmission power, does not affect human health, and meets green environmental protection requirements; in addition, this solution supports NR flexible parameter sets, which is suitable for both Sub-6GHz and millimeter waves. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of a flow chart of an embodiment of a NR signal shielding method of the present invention;

[0038] Figure 2 A schematic diagram of an SS / PBCH Block of an embodiment of a NR signal shielding method of the present invention;

[0039] Figure 3 A schematic diagram of three multiplexing modes of SSB and Coreset0 supported by NR in an embodiment of an NR signal shielding method of the present invention;

[0040] Figure 4 A schematic diagram of interference flow of the prior art of an embodiment of a NR signal shielding method of the present invention;

[0041] Figure 5 A schematic diagram of an interference process of an embodiment of a NR signal shielding method of the present invention;

[0042] Figure 6 The present invention is a logic block diagram of an NR signal shielding system embodiment. DETAILED DESCRIPTION

[0043] The following is further described in detail through specific implementation methods:

[0044] In the present invention, MIB refers to the Main Information Block (MIB for short), which is obtained by decoding the PBCH in the SSB;

[0045] SSB, or Synchronization Signal and PBCH Block (SSB for short), is composed of PSS, SSS, and PBCH.

[0046] PSS refers to Primary Synchronization Signals (PSS for short);

[0047] SSS refers to Secondary Synchronization Signals (SSS for short);

[0048] PBCH refers to Physical Broadcast Channel (PBCH for short);

[0049] PDCCH (Physical Downlink Control Channel) is the physical downlink control channel;

[0050] CORESET (Control Resource SET) is the control resource set;

[0051] DM-RS (Demodulation Reference Signal) is a demodulation reference signal;

[0052] SIB (System Information Block) is a system information block;

[0053] RAR (Random Access Response) is a random access response.

[0054] Embodiment 1

[0055] This embodiment is basically as shown in the attached Figure 1 As shown: A NR signal shielding method, comprising the following contents:

[0056] S1, collect NR base station signals;

[0057] Specifically, S1 includes: blindly scanning the NR synchronization frequency grid, and performing down-conversion and analog-to-digital conversion processing;

[0058] The blind scanning NR synchronous frequency grid is to use the acquisition equipment to receive the wireless signal of the NR synchronous frequency grid frequency band in the environment, that is, the 5G NR base station signal;

[0059] Down-conversion refers to shifting the spectrum of the received wireless signal to convert it into an intermediate frequency signal; analog-to-digital conversion refers to converting an analog signal into a digital signal for subsequent signal processing.

[0060] S2. Detect and decode PBCH according to the NR base station signal to obtain MIB;

[0061] Specifically, S2 includes: searching and saving PBCH DM-RS for NR base station signals, determining SSB index, half-frame indication information, and obtaining half-frame synchronization;

[0062] The specific process is as follows: first perform SSB frequency scanning on the NR base station signal to obtain the primary synchronization signal PSS and the secondary synchronization signal SSS; SSB occupies 4 OFDM symbols in the time domain and 240 subcarriers in the frequency domain; PSS is located in the middle 127 subcarriers of symbol 0, and SSS is located in the middle 127 subcarriers of symbol 2; the primary synchronization signal PSS and the secondary synchronization signal SSS carry the physical cell identification group identifier respectively and physical cell identification group number Therefore, the physical cell identity calculation unit can use the formula Calculate and obtain;

[0063] After the PSS and SSS signals are determined, the PBCH demodulation reference signal DM-RS is further searched; in the time domain, the location of the PSS, SSS and PBCH DM-RS can be determined according to their relative positions; in the frequency domain, the frequency domain distribution of the PBCH DM-RS is related to the physical cell identity, and the frequency domain offset of the PBCH DM-RS can be determined using the obtained physical cell identity information;

[0064] The SSB index information and half-frame indication information are obtained by searching the PBCH DM-RS signal, half-frame synchronization is achieved, and the PBCH is decoded to obtain the MIB; the structure of the MIB is defined as follows:

[0065]

[0066]

[0067] S3. According to pdcch-ConfigSIB1 in MIB, obtain the information of control resource set CORESET0 of physical downlink control channel PDCCH;

[0068] Specifically, pdcch-ConfigSIB1 has 8 bits in total, the upper 4 bits correspond to the frequency domain information of CORESET0, and the lower 4 bits correspond to the time domain information of CORESET0;

[0069] Frequency domain information, including: multiplexing mode with SSB, number of RBs, number of symbols, and offset relative to SSB;

[0070] The time domain information is calculated using the following formula:

[0071]

[0072] Where M and O can be obtained according to the configuration, μ∈{0,1,2,3}, and i represents the index of the SSB detected in the half frame.

[0073] S4. According to the information of the control resource set CORESET0, a white noise interference signal is transmitted to the time domain and frequency domain of the physical downlink control channel PDCCH CORESET0, so that the NR terminal cannot blindly detect the PDCCH, and thus cannot receive the system message SIB1, and finally the NR terminal cannot access the base station normally;

[0074] The white noise interference signal is transmitted, including: performing digital-to-analog conversion on the interference noise, and transmitting it to the air interface after frequency conversion and amplification.

[0075] The initial access process of the terminal includes downlink time and frequency synchronization, acquisition of system messages and uplink synchronization. During the initial access period, the UE also needs to establish an RRC connection with the cell;

[0076] The process of downlink time and frequency synchronization is as follows:

[0077] The UE blindly detects the PSS at each frequency point of the synchronization frequency grid. After detecting the PSS, it can complete the boundary synchronization of the OFDM symbol, the coarse frequency synchronization, and obtain the

[0078] After detecting the PSS, the UE further detects the secondary synchronization signal SSS and obtains according to and The cell ID PCI can be calculated;

[0079] Before coherent demodulation of PBCH, the DMRS reference signal must be obtained first. According to the PCI obtained during SSS detection, the frequency offset of DMRS, i.e. PCImod4, can be obtained, and the frequency domain position of DMRS can be further obtained. According to DMRS, UE can demodulate PBCH, obtain MIB message and additional bearer information, and then know the system frame number and half-frame indication (first half frame or second half frame); at the same time, combined with the additional bearer information of PBCH and the bit information carried by DMRS, the complete SSB time domain index can be obtained, so as to determine the time slot and OFDM symbol position of the current SS, and complete the time slot timing; at this point, the UE basically completes the cell search and achieves downlink synchronization with the gNB.

[0080] The SS / PBCH Block is as follows: Figure 2 As shown, in one SS / PBCH Block, the PSS occupies the OFDM symbol with index 0 in the time domain and occupies 127 consecutive subcarriers starting from subcarrier index 56 and ending with index 182 in the frequency domain;

[0081] In one SS / PBCH Block, the SSS occupies the OFDM symbol with index 2 in the time domain and 127 consecutive subcarriers starting from subcarrier index 56 and ending at index 182 in the frequency domain.

[0082] In one SS / PBCH Block, PBCH occupies three OFDM symbols in the time domain, corresponding to OFDM symbol indexes 1, 2, and 3 respectively. In the frequency domain, PBCH occupies all 240 consecutive subcarriers in OFDM symbols with indexes 1 and 3, and in OFDM with index 2, the middle subcarriers are reserved for SSS. PBCH only occupies subcarriers with subcarrier indexes 0 to 47 and 192 to 239 in this OFDM symbol.

[0083] In an SS / PBCH Block, some REs need to be reserved on the resources occupied by PBCH for DMRS used for PBCH demodulation. One out of every four REs will be used for DMRS, and its index in the frequency domain is related to the PCI of the cell. Specifically, in OFDM symbols with indices 1 and 3, DMRS occupies subcarriers with indices k=0+v, 4+v, 8+v, ..., 236+v in the frequency domain; in OFDM symbols with indices 2, DMRS occupies subcarriers with indices k=0+v, 4+v, 8+v, ..., 44+v and k=192+v, 196+v, ..., 236+v in the frequency domain, where v=PCImod4.

[0084] The process of obtaining system messages is as follows:

[0085] Since PBCH only carries limited system information, it is not enough for UE to stay in the cell and initiate random access; therefore, before this, UE needs to receive SIB1 message to obtain configuration message related to uplink synchronization. SIB1 message in NR is transmitted by PDSCH, and PDSCH needs to be scheduled by DCI message carried by PDCCH. UE needs to obtain necessary parameter information of PDCCH of scheduled SIB1 through pdcch-ConfigSIB1 field in MIB message. PDCCH corresponding to SIB1 is mapped in Type0-PDCCH CSS, corresponding to time-frequency resources of CORESET0; UE can obtain the number of continuous RBs occupied by CORESET0 in frequency domain, the number of continuous OFDM symbols occupied in time domain, and the multiplexing type and offset of CORESET0 and SSB through the high-order 4-bit index table of pdcch-ConfigSIB1 field in MIB. The time domain information of CORESET0 can be obtained by looking up the table with the low-order 4-bit index of pdcch-ConfigSIB1 field. Thus, the time-frequency domain resources of the PDCCH resources for scheduling SIB1 can be obtained. Taking the subcarrier spacing of 15Khz as an example, the time domain and frequency domain corresponding to CORESET0 are shown in Table 1 and Table 2 below:

[0086] Table 1: Frequency domain configuration information of CORESET0 defined in the 3GPP specification, where the high 4 bits of pdcch-ConfigSIB1 configure the Index column of the table;

[0087]

[0088] Table 2: Time domain configuration information of CORESET0 defined in the 3GPP specification, where the lower 4 bits of pdcch-ConfigSIB1 are configured as the Index column of the table;

[0089]

[0090] NR supports three SSB and Coreset0 multiplexing modes: Figure 3 As shown:

[0091] Pattern 1: a multiplexing mode in which SSB and Coreset0 appear at different times (no overlap in the time domain), and the transmission bandwidth of SSB overlaps with the initial downlink BWP including Coreset0 (overlap in the frequency domain);

[0092] Pattern 2: SSB and Coreset0 appear at different times (no overlap in the time domain, may be located in different symbols of the same slot, or may be located in different slots), and the transmission bandwidth of SSB does not overlap with the initial downlink BWP containing coreset0 (no overlap in the frequency domain); the starting symbol index of the Coreset0 listening window will be earlier than the symbol of SSB in the same slot or one slot earlier;

[0093] Pattern3: A multiplexing mode in which SSB and Coreset0 appear at the same time (overlap in the time domain), and the transmission bandwidth of SSB does not overlap with the initial downlink BWP including Coreset0 (no overlap in the frequency domain);

[0094] The UE can calculate the time-frequency domain resource location of CORESET0, and then blindly detect PDCCH to obtain the downlink scheduling DCI, and further demodulate PDSCH in the specified time-frequency domain resources to obtain the SIB1 message. According to the cell selection parameters carried in the SIB1 message, the UE initiates a random access request to synchronize uplink with the gNB.

[0095] Since the positions of CORESET0 and SSB are relatively fixed, after parsing the MIB message, the time and frequency domain resources of CORESET0 can be obtained according to the configuration information of pdcch-ConfigSIB1. By interfering with CORESET0, the UE demodulates PDCCH, so that the UE cannot demodulate PDSCH to obtain SIB1 information. Therefore, the UE cannot initiate a random access request for uplink synchronization with the gNB.

[0096] The prior art needs to obtain the SIB1 message, initiate a random access request according to the cell configuration information carried in the SIB1 message, and prevent the UE from performing uplink synchronization with the gNB by interfering with the random access response.

[0097] Program comparison Figure 4 and Figure 5 As shown, the prior art Figure 4 As shown, although periodic interference is not required, it is only necessary to transmit interference signals within the window period of random access response, but it is necessary to parse the SIB1 message to obtain system configuration information, thereby obtaining the access timing of PRACH, and it is necessary to calculate the time-frequency domain resources of PRACH and detect PRACH on the time-frequency domain resources. After detecting PRACH, full bandwidth interference PDSCH is performed within the random access window time configured by the system;

[0098] This plan Figure 5As shown, the interference bandwidth can be clearly defined, and there is no need to interfere with the full bandwidth. The time-frequency domain resources of CORESET0 can be calculated according to the information configured in pdcch-ConfigSIB1. Only this part of the time-frequency domain resources needs to be interfered with to prevent the UE from completing uplink synchronization with the gNB.

[0099] Embodiment 2

[0100] This embodiment is basically as shown in the attached Figure 6 As shown: A NR signal shielding system, comprising: a data acquisition module, a baseband processing module and a signal sending module;

[0101] A data acquisition module is used to collect NR base station signals and NR terminal signals; specifically, the signal acquisition module receives wireless signals in the NR synchronous frequency grid frequency band in the environment, and performs down-conversion and analog-to-digital conversion processing, that is, blindly scans the NR synchronous frequency grid, and performs down-conversion and analog-to-digital conversion processing;

[0102] The blind scanning NR synchronous frequency grid is to use the acquisition equipment to receive the wireless signal of the NR synchronous frequency grid frequency band in the environment, that is, the 5G NR base station signal;

[0103] Down-conversion refers to shifting the spectrum of the received wireless signal to convert it into an intermediate frequency signal; analog-to-digital conversion refers to converting an analog signal into a digital signal for subsequent signal processing.

[0104] The baseband processing module is used to sample and process the intermediate frequency signal. Specifically, the baseband processing module detects and decodes the PBCH according to the NR base station signal, obtains the MIB, obtains the information of the control resource set CORESET0 of the physical downlink control channel PDCCH according to the pdcch-ConfigSIB1 in the MIB, and generates a white noise interference signal for interfering with the time domain and frequency domain of the physical downlink control channel PDCCH according to the information of the control resource set CORESET0, and sends it to the signal sending module;

[0105] A baseband processing module, comprising: a PBCH decoding unit and an interference signal generating unit;

[0106] A PBCH decoding unit is used to detect and decode the PBCH according to the NR base station signal and obtain the MIB, including: searching and saving the PBCH DM-RS for the NR base station signal, determining the SSB index and half-frame indication information, and obtaining half-frame synchronization;

[0107] The specific process is as follows: the PBCH decoding unit first performs SSB frequency scanning on the NR base station signal to obtain the primary synchronization signal PSS and the secondary synchronization signal SSS; SSB occupies 4 OFDM symbols in the time domain and 240 subcarriers in the frequency domain; PSS is located in the middle 127 subcarriers of symbol 0, and SSS is located in the middle 127 subcarriers of symbol 2; the primary synchronization signal PSS and the secondary synchronization signal SSS carry the physical cell identification group identifier respectively. and physical cell identification group number Therefore, the physical cell identity calculation unit can use the formula Calculate and obtain;

[0108] After the PSS and SSS signals are determined, the PBCH demodulation reference signal DM-RS is further searched; in the time domain, the location of the PSS, SSS and PBCH DM-RS can be determined according to their relative positions; in the frequency domain, the frequency domain distribution of the PBCH DM-RS is related to the physical cell identity, and the frequency domain offset of the PBCH DM-RS can be determined using the obtained physical cell identity information;

[0109] The SSB index information and half-frame indication information are obtained by searching the PBCH DM-RS signal, half-frame synchronization is achieved, and the PBCH is decoded to obtain the MIB; the structure of the MIB is defined as follows:

[0110]

[0111]

[0112] The PDCCH decoding unit is further used to obtain information of a control resource set CORESET0 of a physical downlink control channel PDCCH according to pdcch-ConfigSIB1 in the MIB decoded by the PDCCH decoding unit;

[0113] Among them, pdcch-ConfigSIB1 has a total of 8 bits, the upper 4 bits correspond to the frequency domain information of CORESET0, and the lower 4 bits correspond to the time domain information of CORESET0;

[0114] Frequency domain information, including: multiplexing mode with SSB, number of RBs, number of symbols, and offset relative to SSB;

[0115] The time domain information is calculated using the following formula:

[0116]

[0117] Where M and O can be obtained according to the configuration, μ∈{0,1,2,3}, and i represents the index of the SSB detected in the half frame.

[0118] The interference signal generating unit is used to generate a white noise interference signal for interfering with the time domain and frequency domain of the physical downlink control channel PDCCH CORESET0 according to the information of the control resource set CORESET0, and send it to the signal sending module; specifically, the time and frequency domain resources of CORESET0 are calculated in cooperation with the signal acquisition module, and the white noise interference signal is immediately generated and sent to the signal sending module.

[0119] The signal sending module is used to transmit a white noise interference signal; specifically, the interference noise is converted from digital to analog, and then transmitted to the air interface after frequency conversion and amplification; wherein digital-to-analog conversion refers to converting a digital signal into an analog signal; up-conversion refers to moving the spectrum to the radio frequency; and amplification refers to amplifying the power of the wireless signal.

[0120] The above is only an embodiment of the present invention. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A NR signal shielding method, characterized in that: It includes the following: S1, collect NR base station signals; S2. Detect and decode PBCH according to the NR base station signal to obtain MIB; S3. According to pdcch-ConfigSIB1 in MIB, obtain the information of control resource set CORESET0 of physical downlink control channel PDCCH; S4. According to the information of the control resource set CORESET0, a white noise interference signal is transmitted to the time domain and frequency domain of the physical downlink control channel PDCCH CORESET0.

2. The NR signal shielding method according to claim 1, characterized in that: The S1 includes: blindly scanning the NR synchronization frequency grid, and performing down-conversion and analog-to-digital conversion processing.

3. The NR signal shielding method according to claim 1, characterized in that: S2 includes: searching and saving PBCH DM-RS for 5G NR base station signals, determining SSB index, half-frame indication information, and obtaining half-frame synchronization.

4. The NR signal shielding method according to claim 1, characterized in that: The pdcch-ConfigSIB1 has 8 bits in total, the upper 4 bits correspond to the frequency domain information of CORESET0, and the lower 4 bits correspond to the time domain information of CORESET0; Frequency domain information, including: multiplexing mode with SSB, number of RBs, number of symbols, and offset relative to SSB.

5. The NR signal shielding method according to claim 4, characterized in that: The time domain information is calculated using the following formula: Where M and O can be obtained according to the configuration, μ∈{0,1,2,3}, and i represents the index of the SSB detected in the half frame.

6. A NR signal shielding system, characterized in that: include: Data acquisition module, baseband processing module and signal sending module; Data acquisition module, used to collect NR base station signals and NR terminal signals; A baseband processing module is used to detect and decode PBCH according to the NR base station signal, obtain MIB, obtain information of control resource set CORESET0 of physical downlink control channel PDCCH according to pdcch-ConfigSIB1 in MIB, generate an interference signal for interfering with the time domain and frequency domain of physical downlink control channel PDCCH CORESET0 according to the information of control resource set CORESET0, and send it to the signal sending module; The signal sending module is used to transmit interference signals.

7. The NR signal shielding system according to claim 6, characterized in that: The data acquisition module is used to collect NR base station signals and NR terminal signals, including: blindly scanning the NR synchronization frequency grid, and performing down-conversion and analog-to-digital conversion processing.

8. The NR signal shielding system according to claim 7, characterized in that: The baseband processing module includes: a PBCH decoding unit; The PBCH decoding unit is used to detect and decode the PBCH according to the NR base station signal and obtain the MIB, including: searching and saving the PBCH DM-RS for the NR base station signal, determining the SSB index and half-frame indication information, and obtaining half-frame synchronization.

9. The NR signal shielding system according to claim 8, characterized in that: The PDCCH decoding unit is further used to obtain information of a control resource set CORESET0 of a physical downlink control channel PDCCH according to pdcch-ConfigSIB1 in the MIB decoded by the PDCCH decoding unit; Among them, pdcch-ConfigSIB1 has a total of 8 bits, the upper 4 bits correspond to the frequency domain information of CORESET0, and the lower 4 bits correspond to the time domain information of CORESET0; Frequency domain information, including: multiplexing mode with SSB, number of RBs, number of symbols, and offset relative to SSB; The time domain information is calculated using the following formula: Where M and O can be obtained according to the configuration, μ∈{0,1,2,3}, and i represents the index of the SSB detected in the half frame.

10. The NR signal shielding system according to claim 9, characterized in that: The baseband processing module further includes: an interference signal generating unit; The interference signal generating unit is used to generate a white noise interference signal for interfering with the time domain and frequency domain of the physical downlink control channel PDCCH CORESET0 according to the information of the control resource set CORESET0, and send the signal to the signal sending module.

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