CN113242608B - NR signal shielding method and system based on random access - Google Patents
NR signal shielding method and system based on random access Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W74/00—Wireless channel access, e.g. scheduled or random access
- H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
- H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
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- H04K1/02—Secret communication by adding a second signal to make the desired signal unintelligible
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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
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- 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 relates to the technical field of mobile communication, in particular to a method and a system for shielding NR signals based on random access, wherein the method comprises the following steps: collecting an NR base station signal; detecting and analyzing according to the NR base station signal, and solving the window period duration of RAR; when a message Msg1 sent by an NR terminal for RA is collected in the same frequency band of an NR base station signal, a white noise interference signal is sent to an air interface according to the window period duration of RAR, interference is carried out on a PDCCH of the NR terminal in the window period of the RAR, and then the NR terminal cannot receive the RAR, so that the NR terminal finally fails in uplink synchronization and cannot carry out uplink and downlink traffic services, and therefore the NR signal shielding based on random access is realized. According to the scheme, only the random access process of the interference NR terminal does not transmit any interference signal at other time, so that the consumed power is low and the efficiency is high; and the white noise interference signal only occupies a small amount of time-frequency resources in a specified time period, has small transmitting power, does not influence human health, and meets the requirements of green environmental protection.
Description
Technical Field
The invention relates to the technical field of mobile communication, in particular to a method and a system for shielding an NR signal based on random access.
Background
The mobile communication system mainly comprises three parts of a terminal, a base station and a core network to form two subsystems. The terminal and the base station form a base station subsystem, and the core network comprises a plurality of complex network elements to form a network subsystem. In the base station subsystem, the interface between the terminal and the base station communicates by electromagnetic wave propagating in the air, so the interface between the terminal and the base station is called "air interface". With the development of mobile communication technology, NR (New Radio, New air interface) is a New Radio access technology, which is a 5th-Generation (fifth Generation mobile communication) technical standard designed based on a New air interface of OFDM (Orthogonal Frequency Division Multiplexing), and as of the year 2020, more than 70 thousands of NR base stations have been built in china, and complete coverage of NR signals has been achieved in major cities.
As 5G is gradually beginning to be used in commerce in a global scope, NR base stations are increasingly constructed, and the problem of secret leakage caused by NR terminals is increasingly highlighted, which will present a greater challenge to information security protection in secret-related places such as examination rooms and conference rooms. Therefore, the NR terminal shielding system that can shield the NR terminal in a certain area and make the NR terminal access to the NR base station fail is increasingly used in anti-disclosure places such as examination rooms and conference rooms.
At present, two NR Signal shielding systems are known, namely a compression interference system and a reconstruction SSB (Synchronization Signal and PBCH Block) sequence interference system. The suppression type interference system generates a white noise signal on a wireless communication frequency band at all time, and sends the white noise signal to an air interface after power amplification to suppress interference. In order to achieve the suppression effect, the system usually needs a high-gain power amplifier to boost the transmission power, resulting in greater radiation, and thus does not meet the requirement of green environmental protection. The reconstructed SSB sequence interference system generates a plurality of reconstructed SSB sequences by reconstructing a PSS (Primary Synchronization Signals) sequence, an SSS (Secondary Synchronization Signals) sequence, and a DM-RS (DeModulation Reference Signal) sequence of a PBCH (Physical Broadcast Channel) in the SSB. And generating an interference signal through modulation and resource mapping and sending the interference signal to an air interface, so that the NR terminal cannot normally complete downlink synchronization with the NR base station. The reconstructed SSB sequence interference system enables the NR terminal to try to perform downlink synchronization with the NR base station by repeatedly searching other frequency bands and even increasing power, so that the NR terminal consumes too fast power, resource waste is caused, and the requirement of environmental protection is not met.
Disclosure of Invention
One of the objectives of the present invention is to provide a low power consumption, high efficiency, and green NR signal shielding method based on random access, so as to solve the problems of the NR signal shielding method adopted by the existing NR signal shielding system.
The invention provides a basic scheme I: an NR signal shielding method based on random access comprises the following steps:
s1, collecting NR base station signals;
s2, detecting and analyzing according to the NR base station signal, and solving the window period duration of RAR;
s3, when a 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 an empty port according to the window period duration of the RAR, and interference is carried out on the PDCCH of the NR terminal in the window period of the RAR.
Description of the drawings: in the scheme, RAR: random Access Response, Random Access Response;
RA: random Access, Random Access;
PDCCH: physical Downlink Control Channel, Physical Downlink Control Channel;
RAPID: random Access Preamble Identity.
The basic principle and the beneficial effects of the first basic scheme are as follows: the RA procedure is a procedure in which the NR terminal requests access to the NR base station, receives the RAR of the NR base station, and allocates an access channel, and general data transmission must be performed after RA is successful. When the NR terminal receives the SSB sent by the NR base station and completes downlink synchronization, the NR terminal only completes cell residence, and the NR state of the NR terminal is IDLE or INACTIVE, and the NR terminal cannot perform uplink and downlink traffic services. In the RA process, the NR terminal sends a message Msg1 to the NR base station to initiate random access, and after receiving the message Msg1, the NR base station replies to the RAR through the PDCCH, and when receiving the RAR and detecting a correct RAPID in the RAR, the NR terminal considers that the uplink transmission authorization has been obtained.
According to the scheme, by collecting NR base station signals, and detecting and analyzing according to the NR base station signals, the window period duration of RAR is solved; when a message Msg1 sent by an NR terminal for RA is collected in the same frequency band of an NR base station signal, a white noise interference signal is sent to an air interface according to the window period duration of RAR, interference is carried out on a PDCCH of the NR terminal in the window period of the RAR, and then the NR terminal cannot receive the RAR, so that the NR terminal finally fails in uplink synchronization and cannot carry out uplink and downlink traffic services, and therefore the NR signal shielding based on random access is realized.
Compared with the prior art, the scheme only interferes the random access process of the NR terminal, namely the uplink synchronization process, and the uplink synchronization is actively initiated when the NR terminal needs to process uplink and downlink flow, so that the scheme does not transmit any interference signal at other time, the consumed power is low, and the shielding of the NR signal can be realized only by transmitting a white noise interference signal within the designated time, thereby having high efficiency; and when a message Msg1 sent by the NR terminal in the RA process is collected in the same frequency band of the NR base station signal, a white noise interference signal is sent to an air interface according to the window period duration of the RAR, the white noise interference signal can efficiently interfere, the white noise interference signal only occupies a small amount of time-frequency resources in a specified time period, the transmitting power is small, the human health is not influenced, and the requirement of green environmental protection is met. In the scheme, the uplink synchronization is actively initiated when the NR terminal needs to process uplink and downlink traffic, so that even if the NR terminal repeatedly tries to receive the RAR, the number of the trial times is far less than that of the NR terminal trying to perform the downlink synchronization with the NR base station in the SSB sequence interference method, and therefore the power consumption of the NR terminal is fast and the resource waste can be effectively relieved. In addition, the scheme supports an NR flexible parameter set, namely the method is suitable for Sub-6GHz and is also suitable for millimeter waves.
Further, the S1, acquiring NR base station signals, includes:
s101, blindly scanning an NR global frequency grid to obtain wireless signals of all NR frequency bands, wherein the wireless signals comprise NR base station signals;
s102, carrying out down-conversion processing on the NR base station signal, and converting the NR base station signal into an intermediate frequency signal from a wireless signal;
s103, performing analog-to-digital conversion processing on the NR base station signal which is the intermediate frequency signal, and converting the NR base station signal into a digital signal from the intermediate frequency signal.
Has the advantages that: the method comprises the steps of blindly scanning an NR global frequency grid, obtaining NR base station signals of which all NR frequency bands are wireless signals, ensuring that the NR base station signals of all NR frequency bands in the environment can be collected to support subsequent NR signal shielding, shielding all NR signals, carrying out down-conversion processing and analog-to-digital conversion processing on the wireless signals, carrying out frequency spectrum shifting on the wireless signals to obtain intermediate frequency signals, and converting the intermediate frequency signals which are analog signals into digital signals so as to facilitate subsequent signal processing.
Further, the S2, detecting and analyzing according to the NR base station signal, and solving the RAR window duration includes:
s201, detecting and decoding PBCH by using an NR base station signal which is a digital signal, and solving MIB;
s202, acquiring CORESET and Search Space of the PDCCH according to PDCCH-ConfigSIB1 in the MIB;
s203, collecting and decoding the PDCCH according to the CORESET and the Search Space of the PDCCH, and solving the DCI of the PDSCH;
s204, collecting and decoding the PDSCH according to the DCI of the PDSCH, solving out SIB1, commonly configuring RACH-ConfigGereric according to a random access channel in SIB1, and solving out the window period duration of RAR.
Description of the drawings: MIB in the scheme: main Information Block, Main Information Block;
PDCCH: physical Downlink Control Channel, Physical Downlink Control Channel;
CORESET: controlling the resource set;
search Space: searching a space;
PDSCH: physical Downlink Control Channel, Physical Downlink shared Channel;
DCI: downlink Control Information, Downlink Control Information;
DCI: downlink Control Information, Downlink Control Information;
SIB 1: system Information Block, System Information Block.
Has the advantages that: the steps only use the NR base station signal which is a digital signal, and the window duration of the RAR is obtained through gradual analysis according to the relation among all channels, so that the feasibility is good, and a foundation is laid for subsequent NR signal shielding.
Further, the detecting and decoding of PBCH using NR base station signals that are digital signals includes: searching and storing PBCH DM-RS, determining SSB index and field indication information, and acquiring field synchronization.
Has the advantages that: searching and storing PBCH DM-RS, determining SSB index and field indication information, acquiring field synchronization, and correctly decoding MIB, wherein PDCCH-ConfigSIB1 in the MIB comprises CORESET and Search Space necessary for next PDCCH decoding, and then gradually decoding PDSCH and SIB1, thereby obtaining the window duration of RAR, and therefore, the feasibility is good.
Further, the CORESET is encapsulated with a frequency band where the PDCCH is located, a time domain and the number of OFDM symbols.
Has the advantages that: according to the frequency band, the time domain and the number of OFDM symbols in CORESET, the frequency band and the time domain length of the PDCCH can be accurately positioned at an air interface, and frequency domain resources are instantly acquired, so that preparation is made for receiving the PDCCH.
Further, the Search Space is encapsulated with a starting OFDM symbol number and a monitoring period of the PDCCH.
Has the advantages that: according to the initial OFDM symbol number and the monitoring period in the Search Space, the time domain initial position and the instant frequency domain position of the PDCCH can be accurately positioned at the air interface, and the PDCCH can be accurately received at the air interface by combining the time domain resources obtained in the previous step.
Further, the message Msg1 sent by the NR terminal contains a sequence of RAP and RA-RNTI, which is used for checksum descrambling in a subsequent random access process of the NR terminal.
Description of the drawings: RAP in the scheme: random Access Preamble, Random Access Preamble;
RA-RNTI: random Access Radio Network Temporary Identifier, Random Access wireless Network Identifier.
Has the advantages that: after the NR signal shielding is performed, it is necessary to recover communication between the NR terminal and the NR base station, so that a message Msg1 sent by the NR terminal includes sequences of RAP and RA-RNTI, so that the NR terminal can randomly access a checksum in a subsequent process for descrambling, and communication between the NR terminal and the NR base station can be quickly recovered after the NR signal interference is stopped.
Further, the white noise interference signal adopts a white noise interference signal with increased power.
Has the advantages that: the white noise interference signal with the increased power can interfere more efficiently, and the interference effect is better.
The second objective of the present invention is to provide a low power consumption, high efficiency, and green NR signal shielding system based on random access, so as to solve the problems existing in the conventional NR signal shielding system.
The invention provides a second basic scheme: an NR signal shielding system based on random access comprises a signal acquisition module, a baseband processing module and a signal transmitting module;
the signal acquisition module is used for acquiring NR base station signals and NR terminal signals;
the baseband processing module is used for obtaining the window period duration of RAR by using the NR base station signal; the system is also used for solving a message Msg1 sent by the NR terminal for RA by using the NR terminal signal, generating a white noise interference signal and triggering a signal transmitting module;
and the signal transmitting module is used for transmitting a white noise interference signal to the air interface within the window period duration of the RAR after being triggered by the baseband processing module.
The second basic scheme has the beneficial effects that: according to the scheme, a signal acquisition module is used for acquiring an NR base station signal and an NR terminal signal; the base band processing module obtains the window period duration of RAR by using the NR base station signal, solves the message Msg1 sent by RA by using the NR terminal signal, generates a white noise interference signal and triggers the signal transmitting module; and the signal transmitting module is triggered by the baseband processing module, transmits a white noise interference signal to an air interface within the window period duration of the RAR, and performs interference on a blind detection PDCCH of the NR terminal within the window period of the RAR, so that the NR terminal cannot receive the RAR, and the random access process of the NR terminal is blocked.
Compared with the prior art, the signal transmitting module in the scheme transmits a white noise interference signal to an air interface within the window period duration of RAR after being triggered by the baseband processing module, so as to interfere the random access process of the NR terminal, namely the uplink synchronization process, and the uplink synchronization is actively initiated when the NR terminal needs to process uplink and downlink flow, so that the signal transmitting module does not transmit any interference signal at other time, thus the consumed power is low, and the efficiency is high; and the white noise interference signal is transmitted within the window period duration of the RAR, so that the interference can be efficiently carried out, the white noise interference signal only occupies a small amount of time-frequency resources within a specified time period, the transmission power is low, the human health is not influenced, and the requirements of environmental protection are met. In addition, the scheme supports an NR flexible parameter set, namely the method is suitable for Sub-6GHz and is also suitable for millimeter waves.
Further, the signal acquisition module is configured to acquire an NR base station signal and an NR terminal signal, and includes:
receiving wireless signals of all NR frequency bands in an environment, wherein the wireless signals comprise NR base station signals;
performing down-conversion processing on the wireless signal to convert the wireless signal into an intermediate frequency signal;
performing analog-to-digital conversion processing on the intermediate frequency signal, and converting the intermediate frequency signal into a digital signal;
and simultaneously acquiring NR terminal signals in the same frequency band as the NR base station signals.
Has the advantages that: receiving wireless signals of all frequency bands of NR in the environment to support the shielding of subsequent NR signals and shield all NR signals, carrying out down-conversion processing and analog-to-digital conversion processing on the wireless signals, firstly carrying out frequency spectrum shifting on the wireless signals to change the wireless signals into intermediate frequency signals, and then converting the intermediate frequency signals which are analog signals into digital signals so as to facilitate the subsequent signal processing.
Further, the baseband processing module comprises a PBCH decoding unit, a PDCCH decoding unit, a PDSCH decoding unit and an interference signal generating unit;
the PBCH decoding unit is used for carrying out SSB frequency sweep according to NR base station signals, acquiring PSS and SSS, searching PBCH DM-RS signals according to the PSS and SSS so as to acquire index information and half-frame indication information of the SSB, acquiring half-frame synchronization, decoding PBCH and solving MIB;
the PDCCH decoding unit is used for acquiring CORESET and Search Space of the PDCCH according to the PDCCH-ConfigSIB1 in the MIB decoded by the PBCH decoding unit, acquiring and decoding the PDCCH under the coordination of the signal acquisition module according to the CORESET and the Search Space, and decoding the DCI of the PDSCH;
the PDSCH decoding unit is used for acquiring and decoding the PDSCH under the coordination of the signal acquisition module according to the DCI decoded by the PDCCH decoding unit, decoding an SIB1, and decoding the window period duration of the RAR according to RACH-ConfigGereric in the SIB 1;
and the interference signal generation unit is used for generating a white noise interference signal and triggering the signal emission module when the signal acquisition module acquires a message Msg1 sent by the NR terminal in RA.
Has the advantages that: the NR base station signal is processed by the PBCH decoding unit, the PDCCH decoding unit, and the PDSCH decoding unit to obtain the window duration of the RAR, so that the signal transmitting module can transmit a white noise interference signal in the window of the RAR. And the interference signal generating unit generates a white noise interference signal and triggers the signal transmitting module when the signal acquisition module acquires a message Msg1 sent by the NR terminal in RA, so that the signal transmitting module can timely and accurately transmit the white noise interference signal for interference in the window period of RAR.
Further, the signal transmitting module is configured to transmit a white noise interference signal to an air interface within a window period duration of the RAR after being triggered by the baseband processing module, and includes:
performing digital-to-analog conversion processing on the white noise interference signal generated by the interference signal generating unit;
carrying out up-conversion processing on a white noise interference signal which is an analog signal;
and transmitting a white noise interference signal to an air interface within the window period duration of the RAR.
Has the advantages that: the signal transmitting module is used for carrying out digital-to-analog conversion processing on the white noise interference signal generated by the interference signal generating unit and converting the white noise interference signal into an analog signal from a digital signal; carrying out up-conversion processing on a white noise interference signal which is an analog signal, and moving a frequency spectrum to a radio frequency; and transmitting a white noise interference signal to an air interface within the window period duration of the RAR, so that the white noise interference signal can interfere the NR terminal with the blind detection PDCCH within the window period of the RAR.
Further, before transmitting the white noise interference signal to the air interface within the window period duration of the RAR, amplifying the power of the white noise interference signal.
Has the advantages that: the white noise interference signal with the increased power can interfere more efficiently, and the interference effect is better.
Drawings
Fig. 1 is a flowchart of an embodiment of a method for shielding an NR signal based on random access according to the present invention;
fig. 2 is a logic block diagram of an embodiment of a NR signal masking system based on random access according to the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
example one
This embodiment is substantially as shown in figure 1: an NR signal shielding method based on random access comprises the following steps:
s1, collecting NR base station signals, including:
s101, blindly scanning an NR global frequency grid to obtain wireless signals of all NR frequency bands, wherein the wireless signals comprise NR base station signals;
s102, carrying out down-conversion processing on the NR base station signal, and converting the NR base station signal into an intermediate frequency signal from a wireless signal;
s103, performing analog-to-digital conversion processing on the NR base station signal which is the intermediate frequency signal, and converting the NR base station signal into a digital signal from the intermediate frequency signal.
S2, detecting and analyzing according to the NR base station signal, and solving the window duration of the RAR, including:
s201, detecting and decoding PBCH by using an NR base station signal which is a digital signal, and solving MIB; the method for detecting and decoding PBCH by using the NR base station signal which is a digital signal comprises the following steps: searching and storing PBCH DM-RS, determining SSB index and half frame indication information, and acquiring half frame synchronization; the method specifically comprises the following steps: and carrying out SSB frequency sweep according to the NR base station signal to obtain the PSS and the SSS, wherein the SSB occupies 4 OFDM symbols in a time domain and 240 subcarriers in a frequency domain. The PSS is located in the middle 127 subcarriers of symbol 0 and the SSS is located in the middle 127 subcarriers of symbol 2. PSS and SSS respectively carry identification in physical cell identification group
And physical cell identification group number
Therefore, the temperature of the molten metal is controlled,the physical cell identity calculation unit can be calculated by formula
And (6) calculating to obtain. After the PSS and SSS signals are determined, PBCH DM-RS signals are searched according to the PSS and SSS. The method specifically comprises the following steps: in the time domain, the corresponding position of the PBCH DM-RS can be determined according to the relative positions of the PSS, the SSS and the PBCH DM-RS; in the frequency domain, the frequency domain distribution of the PBCH DM-RS is related to the physical cell identification, and the frequency domain offset of the PBCH DM-RS can be determined by utilizing the solved physical cell identification information. The PBCH decoding unit searches the PBCH DM-RS signal to acquire the index information and the field indication information of the SSB, and acquires field synchronization. And decodes PBCH to retrieve MIB. The structure of MIB is defined as follows:
s202, acquiring CORESET and Search Space of the PDCCH according to the PDCCH-ConfigSIB1 in the MIB. The CORESET is packaged with a frequency range, a time domain and an OFDM symbol number where the PDCCH is located, and the Search Space is packaged with an initial OFDM symbol number and a monitoring period of the PDCCH. According to the definition in 3GPP R1538.213, the CORESET of PDCCH is a continuous RB (Resource Block, the smallest Resource scheduling unit in NR), after obtaining RB boundary position from Kssb (representing the number of carriers from subcarrier 0 of SSB to CRB (Common Resource Block, Common Resource Block) subcarrier position 0), the high 4 bits of PDCCH-ConfigSIB1 in MIB information are used as the row numbers of tables 13-1 to 13-10 in 3GPP R1538.213 to obtain the frequency domain position of the scheduled PDCCH, and obtain the symbol number of CORESET; similarly, the time-frequency domain position Search Space of the PDCCH is obtained through tables 13-11 to 13-15 in 3GPP R1538.213;
s203, according to the CORESET and the Search Space of the PDCCH, namely the time-frequency domain resource and the time-frequency domain position of the PDCCH, the PDCCH can be acquired and decoded at an air interface, and the DCI of the PDSCH is solved. In 3GPP R1538.212, DCI is divided into 8 format definitions, 0_0, 0_1, 1_0, 1_1, 2_0, 2_1, 2_2, and 2_3, respectively. Format 1_0 is used for scheduling PDSCH when NR terminal accesses, and includes SIB1, OSI, Msg2, Msg4, and the like. Format 1_0 contains contents such as frequency domain and time domain resource indication, adjustment and coding mode indication, downlink allocation indication and the like of the PDSCH, and is used for acquiring and decoding the PDSCH;
s204, collecting and decoding the PDSCH according to the DCI of the PDSCH, solving out SIB1, commonly configuring RACH-ConfigGereric according to a random access channel in SIB1, and solving out the window period duration of RAR. Wherein the structure of RACH-ConfigGereric is defined as follows:
where ra-ResponseWindow is the window duration of the RAR. sl1 represents 10 milliseconds, sl2 represents 20 milliseconds, and so on, sl80 is 800 milliseconds.
In addition, RACH-configgerric is located in the structural definition of RACH-ConfigCommon, RACH-ConfigCommon is located in the structural definition of BWP-DownlinkCommon, BWP-DownlinkCommon is located in the structural definition of downlinkconfigcommon SIB, uplinkconfigcommon SIB is located in the structural definition of servingcellconfigcommon SIB, and the position of servingcellconfigcommon SIB in SIB1 is as follows:
s3, when a message Msg1 sent by the NR terminal for RA is collected at the same frequency band of the NR base station signal, a white noise interference signal is sent to an air interface according to the time length of the window period of the RAR, interference is carried out on the PDCCH of the NR terminal in the window period of the RAR in a blind detection mode, the white noise interference signal can adopt a white noise interference signal with increased power, and the white noise interference signal adopts the white noise interference signal with increased power in the embodiment, so that the interference effect is improved. In addition, in the scheme, the white noise interference signal with the increased power is shielded indoors, the power of the white noise interference signal is generally but not limited to be increased to 500 milliwatts to 1000 milliwatts, and the power of the white noise interference signal is shielded outdoors, the white noise interference signal is increased to be different according to different coverage radiuses, and the power of the white noise interference signal is generally but not limited to be increased to be 1 watt to 20 watts. The message Msg1 sent by the NR terminal includes a sequence of RAP and RA-RNTI, and is used for checksum descrambling in a subsequent random access process of the NR terminal.
The working principle is as follows: the RA procedure is a procedure in which the NR terminal requests access to the NR base station, receives the RAR of the NR base station, and allocates an access channel, and general data transmission must be performed after RA is successful. When the NR terminal receives the SSB sent by the NR base station and completes downlink synchronization, the NR terminal only completes cell residence, and the NR state of the NR terminal is IDLE or INACTIVE, and the NR terminal cannot perform uplink and downlink traffic services. In the RA process, the NR terminal sends a message Msg1 to the NR base station to initiate random access, and after receiving the message Msg1, the NR base station replies to the RAR through the PDCCH, and when receiving the RAR and detecting a correct RAPID in the RAR, the NR terminal considers that the uplink transmission authorization has been obtained.
According to the scheme, by collecting NR base station signals, and detecting and analyzing according to the NR base station signals, the window period duration of RAR is solved; when a message Msg1 sent by an NR terminal for RA is collected in the same frequency band of an NR base station signal, a white noise interference signal with power added is sent to an air interface according to the window period duration of RAR, interference is carried out on a PDCCH of the NR terminal in the window period of the RAR, and then the NR terminal cannot receive the RAR, so that the NR terminal finally fails in uplink synchronization and cannot carry out uplink and downlink traffic services, and therefore the NR signal shielding based on random access is realized. Only the random access process of the NR terminal is interfered, namely the uplink synchronization process, and the uplink synchronization is actively initiated when the NR terminal needs to process uplink and downlink flow, so that the scheme does not transmit any interference signal at other time, thereby having low power consumption and high efficiency; and when a message Msg1 sent by the NR terminal in the RA process is collected in the same frequency band of the NR base station signal, a white noise interference signal with increased power is sent to an air interface according to the window period duration of the RAR, the white noise interference signal with increased power can efficiently interfere, the white noise interference signal only occupies a small amount of time-frequency resources in a specified time period, the transmitting power is small, the human health is not influenced, and the requirement of green environmental protection is met.
Example two
This embodiment is substantially as shown in figure 2: an NR signal shielding system based on random access comprises a signal acquisition module, a baseband processing module and a signal transmitting module;
the signal acquisition module is used for acquiring NR base station signals and NR terminal signals, and comprises: receiving wireless signals of all NR frequency bands in an environment, wherein the wireless signals comprise NR base station signals; performing down-conversion processing on the wireless signal to convert the wireless signal into an intermediate frequency signal; and performing analog-to-digital conversion processing on the intermediate frequency signal, and converting the intermediate frequency signal into a digital signal so as to facilitate subsequent signal processing. And simultaneously acquiring NR terminal signals in the same frequency band as the NR base station signals.
The baseband processing module is used for obtaining the window period duration of RAR by using the NR base station signal; and the system is also used for solving a message Msg1 sent by the NR terminal for RA by using the NR terminal signal, generating a white noise interference signal and triggering a signal transmitting module.
The baseband processing module comprises a PBCH decoding unit, a PDCCH decoding unit, a PDSCH decoding unit and an interference signal generating unit;
the PBCH decoding unit is configured to perform SSB frequency sweeping according to the NR base station signal, and acquire the PSS and the SSS, where the SSB occupies 4 OFDM symbols in the time domain and 240 subcarriers in the frequency domain. The PSS is located in the middle 127 subcarriers of symbol 0 and the SSS is located in the middle 127 subcarriers of symbol 2. PSS and SSS respectively carry identification in physical cell identification group
And physical cell identification group number
Therefore, a physical cell identity calculation unitCan be represented by formula
And (6) calculating to obtain. After the PSS and SSS signals are determined, PBCH DM-RS signals are searched according to the PSS and SSS. The method specifically comprises the following steps: in the time domain, the corresponding position of the PBCH DM-RS can be determined according to the relative positions of the PSS, the SSS and the PBCH DM-RS; in the frequency domain, the frequency domain distribution of the PBCH DM-RS is related to the physical cell identification, and the frequency domain offset of the PBCH DM-RS can be determined by utilizing the solved physical cell identification information. The PBCH decoding unit searches the PBCH DM-RS signal to acquire the index information and the field indication information of the SSB, and acquires field synchronization. And decodes PBCH to retrieve MIB.
The PDCCH decoding unit is used for acquiring CORESET and Search Space of the PDCCH according to the PDCCH-ConfigSIB1 in the MIB decoded by the PBCH decoding unit, acquiring and decoding the PDCCH under the coordination of the signal acquisition module according to the CORESET and the Search Space, and decoding the DCI of the PDSCH;
the PDSCH decoding unit is used for acquiring and decoding the PDSCH under the coordination of the signal acquisition module according to the DCI decoded by the PDCCH decoding unit, decoding an SIB1, and decoding the window period duration of the RAR according to RACH-ConfigGereric in the SIB 1;
and the interference signal generation unit is used for generating a white noise interference signal and triggering the signal emission module when the signal acquisition module acquires a message Msg1 sent by the NR terminal in RA.
The signal transmitting module is configured to transmit a white noise interference signal to an air interface within a window period duration of the RAR after being triggered by the baseband processing module, and includes: performing digital-to-analog conversion processing on the white noise interference signal generated by the interference signal generating unit; carrying out up-conversion processing on a white noise interference signal which is an analog signal; amplifying the power of the white noise interference signal; and transmitting a white noise interference signal with increased power to an air interface within the window period duration of the RAR.
The foregoing is merely an example of the present invention, and common general knowledge in the field of known specific structures and characteristics is not described herein in any greater extent than that known in the art at the filing date or prior to the priority date of the application, so that those skilled in the art can now appreciate that all of the above-described techniques in this field and have the ability to apply routine experimentation before this date can be combined with one or more of the present teachings to complete and implement the present invention, and that certain typical known structures or known methods do not pose any impediments to the implementation of the present invention by those skilled in the art. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (9)
1. An NR signal shielding method based on random access, comprising: the method comprises the following steps:
s1, collecting NR base station signals;
s2, detecting and analyzing according to the NR base station signal, and solving the window period duration of RAR; the S2 includes:
s201, detecting and decoding PBCH by using an NR base station signal which is a digital signal, and solving MIB;
s202, acquiring CORESET and Search Space of the PDCCH according to PDCCH-ConfigSIB1 in the MIB;
s203, collecting and decoding the PDCCH according to the CORESET and the Search Space of the PDCCH, and solving the DCI of the PDSCH;
s204, acquiring and decoding the PDSCH according to the DCI of the PDSCH, solving SIB1, commonly configuring RACH-ConfigGereric according to a random access channel in SIB1, and solving the window period duration of the RAR, wherein ra-ResponseWindow in the RACH-ConfigGereric structure is the window period duration of the RAR;
s3, when a message Msg1 sent by an NR terminal for RA is acquired in the same frequency band of an NR base station signal, a white noise interference signal is sent to an air interface according to the time length of a window period of RAR, interference is carried out on a PDCCH of the NR terminal in the window period of the RAR in a blind detection mode, the message Msg1 comprises a sequence of RAP and RA-RNTI and is used for checking and descrambling in a follow-up random access process of the NR terminal, and the white noise interference signal adopts a white noise interference signal with increased power and is increased to different power according to different coverage radiuses.
2. The method of claim 1, wherein the NR signal masking based on random access is: the S1 includes:
s101, blindly scanning an NR global frequency grid to obtain wireless signals of all NR frequency bands, wherein the wireless signals comprise NR base station signals;
s102, carrying out down-conversion processing on the NR base station signal, and converting the NR base station signal into an intermediate frequency signal from a wireless signal;
s103, performing analog-to-digital conversion processing on the NR base station signal which is the intermediate frequency signal, and converting the NR base station signal into a digital signal from the intermediate frequency signal.
3. The method of claim 1, wherein the NR signal masking based on random access is: the detecting and decoding of PBCH using NR base station signals that are digital signals includes: searching and storing PBCH DM-RS, determining SSB index and field indication information, and acquiring field synchronization.
4. The method of claim 1, wherein the NR signal masking based on random access is: and the CORESET is encapsulated with a frequency band where the PDCCH is located, a time domain and the number of OFDM symbols.
5. The method of claim 1, wherein the NR signal masking based on random access is: the Search Space is encapsulated with the starting OFDM symbol number and the monitoring period of the PDCCH.
6. An NR signal masking system based on random access, comprising: the device comprises a signal acquisition module, a baseband processing module and a signal transmitting module;
the signal acquisition module is used for acquiring NR base station signals and NR terminal signals;
the baseband processing module is used for obtaining the window period duration of RAR by using the NR base station signal; the system is also used for solving a message Msg1 sent by the NR terminal for RA by using the NR terminal signal, generating a white noise interference signal and triggering a signal transmitting module, wherein the message Msg1 comprises a sequence of RAP and RA-RNTI and is used for checking and descrambling the NR terminal randomly accessed to the subsequent process; the baseband processing module comprises a PBCH decoding unit, a PDCCH decoding unit, a PDSCH decoding unit and an interference signal generating unit;
the PBCH decoding unit is used for carrying out SSB frequency sweep according to NR base station signals, acquiring PSS and SSS, searching PBCH DM-RS signals according to the PSS and SSS so as to acquire index information and half-frame indication information of the SSB, acquiring half-frame synchronization, decoding PBCH and solving MIB;
the PDCCH decoding unit is used for acquiring CORESET and Search Space of the PDCCH according to the PDCCH-ConfigSIB1 in the MIB decoded by the PBCH decoding unit, acquiring and decoding the PDCCH under the coordination of the signal acquisition module according to the CORESET and the Search Space, and decoding the DCI of the PDSCH;
the PDSCH decoding unit is used for acquiring and decoding the PDSCH under the coordination of the signal acquisition module according to the DCI decoded by the PDCCH decoding unit, decoding an SIB1, and decoding the window period duration of the RAR according to RACH-ConfigGereric in the SIB1, wherein ra-ResponseWindow in the RACH-ConfigGereric structure is the window period duration of the RAR;
the interference signal generating unit is used for generating a white noise interference signal and triggering the signal transmitting module when the signal acquisition module acquires a message Msg1 sent by the NR terminal in RA;
the signal transmitting module is used for transmitting a white noise interference signal to the air interface within the window period duration of the RAR after being triggered by the baseband processing module, and amplifying the power of the white noise interference signal before transmitting the white noise interference signal to the air interface within the window period duration of the RAR, and increasing the power to different powers according to different coverage radiuses.
7. The random access based NR signal masking system of claim 6, wherein: the signal acquisition module is used for acquiring NR base station signals and NR terminal signals, and comprises:
receiving wireless signals of all NR frequency bands in an environment, wherein the wireless signals comprise NR base station signals;
performing down-conversion processing on the wireless signal to convert the wireless signal into an intermediate frequency signal;
performing analog-to-digital conversion processing on the intermediate frequency signal, and converting the intermediate frequency signal into a digital signal;
and simultaneously acquiring NR terminal signals in the same frequency band as the NR base station signals.
8. The random access based NR signal masking system of claim 6, wherein: the signal transmitting module is configured to transmit a white noise interference signal to an air interface within a window period duration of the RAR after being triggered by the baseband processing module, and includes:
performing digital-to-analog conversion processing on the white noise interference signal generated by the interference signal generating unit;
carrying out up-conversion processing on a white noise interference signal which is an analog signal;
and transmitting a white noise interference signal to an air interface within the window period duration of the RAR.
9. The random access based NR signal masking system of claim 6, wherein: and before transmitting the white noise interference signal to an air interface within the time length of the RAR window period, amplifying the power of the white noise interference signal.
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