CN104158619A - LTE (Long Term Evolution) signal shielding method and system based on CRS (Central Reservation System) - Google Patents
LTE (Long Term Evolution) signal shielding method and system based on CRS (Central Reservation System) Download PDFInfo
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Abstract
The invention provides an LTE (Long Term Evolution) signal shielding method based on a CRS (Central Reservation System). The shielding method is applicable to an FDD-LTE (Frequency Division Duplex-Long Term Evolution) system and a TD-LTE system, and has an ideal interference effect on terminals in an RRC-CONNECTED (Common Reference Signal) or RRC-IDLE state. The method comprises the following steps: (1) searching a frequency point of a base station which serves a terminal inside a target shielding area, synchronizing with the base station and acquiring frame timing information and physical layer cell mark information; (2) receiving PBCH (Physical Broadcast Channel) information of all searched base stations, and acquiring the number of transmitting antenna ports, the CP (Cyclic Prefix) length and the downlink transmission bandwidth of different cells; (3) generating interference CRS sequences to different cells respectively according to the parameter information obtained in the steps (1) and (2); (4) respectively mapping the generated interference CRS sequences of different cells to RE which are the same as CRS of corresponding cells, converting into time domain data, and transmitting out at corresponding frequency points.
Description
Technical field
The present invention relates to wireless mobile telecommunication technology field, relate in particular to a kind of LTE signal shielding method and system based on CRS.
Background technology
Along with the development of mobile communication technology, the problem of divulging a secret of mobile communication also enjoys attention.Because wireless channel has opening, as long as utilize corresponding receiving equipment, just can intercept and capture the call-information of mobile phone, and it is positioned, followed the tracks of and monitors.But in the particular surroundingss such as concerning security matters meeting room, prison and national important government, military service, in order to prevent that mobile communication from divulging a secret, be not wish to carry out mobile communication.For this reason, can utilize signal shielding system to cut off contacting of mobile phone and base station, thereby make any means of communication and receiving equipment all cannot obtain the information of mobile phone.
The signal shielding system of extensive use is at present the pattern based on power compacting mostly, and shielding harness utilizes noise as interference signal, in the frequency range of disturbing, launches high-power broadband white noise or launches white noise in the mode of frequency sweep at needs.The signal shielding system of this pattern is the signal to noise ratio that receives signal by high-power reducing noise mobile phone, thus blocking-up mobile communication.This scheme need to send powerful noise in full frequency band, and the transmitting power of shielding harness cannot meet the requirement of National Environmental electromagnetic wave sanitary standard far away, will certainly affect health for a long time under the radiation of shielding harness.And this jamming program is while being applied to TDD (Time Division Duplex, time division duplex) system, can impact up link, and the telex network in non-shielding area is interfered.
Based on above reason, the counterfeit conflicting mode of signaling more and more comes into one's own.This conflicting mode is the behavior by anolog base station, shielding harness transmitting and the similar interference signal/signaling of base station signal/signaling, thus make mobile phone cannot correctly solve the relevant information blocking-up mobile communication of base station.This scheme can reduce the transmitting power of shielding harness greatly, and because only transmitting interference on the running time-frequency resource at corresponding signal/signaling place also can not impact up link.For LTE (Long Term Evolution, Long Term Evolution) system, can disturbed signal/signaling there is PSS (Primary Synchronization Signal, master sync signal), SSS (Secondary Synchronization Signal, auxiliary synchronous signals), CRS (Common Reference Signal, public reference signal), PBCH (Physical Broadcast Channel, Physical Broadcast Channel), PCFICH (Physical Control Format Indicator Channel, Physical Control Format Indicator Channel) etc.Wherein the antijamming capability of PSS and SSS is stronger, and because mobile phone is not real-time decoding synchronizing signal, therefore unsatisfactory for RRC-CONNECTED user's interference effect; PBCH is also just used for demodulating system information in the time of mobile phone access network, also cannot produce desirable interference effect for RRC-CONNECTED user.
Therefore, in order effectively to disturb LTE signal, and consider health and the impact on uplink channel interference, the present invention proposes a kind of to disturb the counterfeit formula jamming program of CRS signal as means.
Summary of the invention
The invention provides a kind of LTE signal shielding method based on CRS, this screen method is applicable to FDD-LTE and TD-LTE system, all can play desirable interference effect to the terminal in RRC-CONNECTED or RRC-IDLE state.
An important function of CRS is the channel estimating for carrying out terminal, to realize the correlation demodulation to downlink transfer.CRS is at each descending sub frame, and each Resource Block on frequency domain transmits, and crosses over whole descending bandwidth of cell.Terminal utilizes known local CRS and the CRS that receives base station transmission to estimate in real time each RE (Resource Element, Resource Unit) on channel response, therefore disturb CRS can make terminal cannot correctly estimate the channel response between base station, thus the information that correctly demodulation base station sends.No matter be the terminal in RRC-CONNECTED or RRC-IDLE state, as long as carry out downlink transfer, just need to use CRS to carry out channel estimating, therefore disturb CRS can shield the signal of the terminal in any state.
The invention provides a kind of LTE signal shielding method based on CRS, in the LTE system of shielding harness, base station, terminal composition, implementation step is as follows:
1) frequency of the base station of search to the Terminal Service in target shielding area, receives PSS, SSS synchronizing signal that base station sends, shielding harness is synchronizeed with base station, and obtain frame timing information and physical-layer cell identifier information;
For single-frequency list cell conditions, the base station frequency point that shielding harness searches only has one, and under this frequency, only has Yi Ge community;
For common frequency multi-cell situation, the base station frequency point that shielding harness searches only has one, but under this frequency, has multiple communities;
For the many cell conditions of multifrequency, the base station frequency point that shielding harness searches has multiple, and the number of cells under each frequency is more than or equal to one.
2) shielding harness receives the PBCH information of all communities that search, and obtains transmitting antenna port number, CP (Cyclic Prefix, Cyclic Prefix) length and the downstream transmission bandwidth of each community by the mode of blind Detecting;
3) shielding harness is according to step 1), 2) in each parameter information of obtaining, generate and disturb CRS sequence for each community respectively;
Described interference CRS sequence meets following condition:
The pseudo random sequence that 3-1) the local CRS sequence of use Yu Zhe community transmission is identical or the different pseudo random sequence of local CRS sequence that uses a certain fixing Yu Zhe community to send;
3-2) described interference CRS sequence is modulated laggard line phase rotation through QPSK, and the differential seat angle of the CRS signal rotation in the OFDM symbol of adjacent carrying CRS is not 0;
4) that the interference CRS sequence of each community generating is mapped to respectively to the RE identical with the CRS of respective cell is upper for shielding harness, and converts time domain data to and launching on corresponding frequency.
For single-frequency list cell conditions, shielding harness converts the frequency domain data after mapping to time domain data and launches on corresponding frequency;
For common frequency multi-cell situation, based on the reference signal strength that receives each cell signal, shielding harness will disturb the CRS signal of each community to be weighted stack, then converts time domain data to and launching on corresponding frequency;
For the many cell conditions of multifrequency, according to the difference of number of cells under each frequency, process respectively according to single-frequency list community and two kinds of common frequency multi-cells situation.
Further, the terminal in target shielding area receives the CRS power that shielding harness sends and is not less than the CRS power that the LTE base station that receives sends.
The present invention also provides a kind of LTE signal shielding system based on CRS, in order to realize the above-mentioned LTE signal shielding method based on CRS, comprises with lower unit: frequency sweep unit, for searching for the base station frequency point information to the Terminal Service in target shielding area; Base station signal receiving element, for the PSS, SSS synchronizing signal and the PBCH information that receive and demodulation base station sends, obtains frame timing information, physical-layer cell identifier information, antenna port number, CP length and downstream transmission bandwidth; Interference signal generation unit, produces and disturbs CRS sequence for the each parameter information obtaining according to base station signal receiving element; Interference signal transmitting element, the interference CRS sequence that interference signal generation unit is obtained, through the processing of transmitting terminal, is launched on corresponding frequency.
Signal shielding method of the present invention, is not only applicable to single-frequency list cell system, is applicable to the communication system of He Duo frequency multi-cell, common frequency multi-cell simultaneously yet.Described method is not only applicable to the signal shielding of FDD-LTE system, and is applicable to the signal shielding of TD-LTE system.Described method not only can shield the user of RRC-IDLE state, and can shield the user of RRC-CONNECTED state.
Beneficial effect:
The LTE signal shielding method based on CRS that the present invention proposes is the interference method of the counterfeit formula of a kind of signal.The method not only can shield the subscriber signal of different conditions, and only need in a small amount of down time-frequency resource, launch interference signal, make to decline to a great extent compared with the transmitting power of shielding harness and the shielding harness of noise pressing type, by the compare test of existing product on products and marketing of the present invention, fall is 27dB left and right, can not cause adverse effect to health.The method only sends interference signal on down channel simultaneously, therefore can not exert an influence near base station shielding area, also can not affect the user's proper communication in non-shielding area.
Brief description of the drawings
Fig. 1 is the LTE signal shielding method realization flow figure based on CRS in the embodiment of the present invention;
Fig. 2 is the receiving terminal process chart of synchronizing signal in the embodiment of the present invention;
Fig. 3 is the receiving terminal process chart of Physical Broadcast Channel in the embodiment of the present invention;
Fig. 4 is the mapping of the downlink reference signal under conventional CP schematic diagram in the embodiment of the present invention;
Fig. 5 is the downlink reference signal mapping schematic diagram of expanding in the embodiment of the present invention under CP;
Fig. 6 is the LTE signal shielding system functional block diagram based on CRS in the embodiment of the present invention.
Embodiment
Describe embodiments of the present invention in detail below in conjunction with drawings and Examples, case study on implementation is implemented under taking technical solution of the present invention as prerequisite, has provided detailed execution mode and concrete operating process.It should be noted that, only otherwise form conflict, each feature in each embodiment and each embodiment in the present invention can mutually combine, and the technical scheme forming is all within protection scope of the present invention.
Application example 1:
The present embodiment, in conjunction with TD-LTE system, describes the LTE signal shielding method based on CRS that the present invention proposes in detail in conventional CP situation, and as shown in Figure 1, specific implementation step is as follows for scheme flow process:
1. near TD-LTE base station frequency point search mask system, according to the handling process shown in Fig. 2, receives PSS, SSS synchronizing signal that base station sends, shielding harness is synchronizeed with TD-LTE base station, and obtain frame timing information and physical-layer cell identifier information
2. according to the handling process shown in Fig. 3, receive the PBCH information that TD-LTE base station sends, obtain transmitting antenna port number AP and the downstream transmission bandwidth Bw of base station by the mode of blind Detecting.
3. according to the each parameter information obtaining in step 1,2, generate and disturb CRS sequence, concrete steps are as follows:
● generate the sequence identical with TD-LTE CRS that base station is sent out
Reference signal sequence
be defined as:
Wherein, n
srepresent the timeslot number in a radio frames; L represents an OFDM symbol sequence number in time slot; C (m) is pseudo random sequence, is defined as:
c(m)＝(x
1(m+N
C)+x
2(m+N
C))mod2
x
1(m+31)＝(x
1(m+3)+x
1(m))mod2 (2)
x
2(m+31)＝(x
2(m+3)+x
2(m+2)+x
2(m+1)+x
2(m))mod2
Wherein, N
c=1600, initial value x
1(0)=1, x
1(m)=0, m=1,2 ..., 30,
c (m) carries out initialization at each OFDM symbol, sees formula (3).
Wherein, in conventional CP situation, N
cP=1.
● generate and disturb CRS sequence
Compare with the CRS sequence that base station sends, after interference CRS sequence QPSK modulation, need to carry out phase rotating, the angular difference of the CRS signal rotation in the OFDM symbol of adjacent carrying CRS is not 0.Disturb CRS sequence to be expressed as:
4. by the interference CRS sequence generating
be mapped to the RE identical with the CRS of base station transmission upper, as shown in Figure 4.Running time-frequency resource position and antenna port quantity AP and the physical-layer cell identifier information of the concrete mapping of CRS
relevant, its bandwidth taking is whole downstream transmission bandwidth Bw.Described running time-frequency resource is that the shared running time-frequency resource of CRS sequence sending with TD-LTE base station is identical.
After the conversion of frequency domain-time domain data, on corresponding frequency, going out with certain power emission, make terminal in target shielding area receive CRS power that shielding harness sends and be not less than the CRS power that the TD-LTE base station that receives sends.
So far, shielding harness has completed the signal shielding to blind zone intra domain user by jamming program of the present invention.
Application example 2:
The present embodiment, in conjunction with FDD-LTE system, describes the LTE signal shielding method based on CRS that the present invention proposes in detail in expansion CP situation, and as shown in Figure 1, specific implementation step is as follows for scheme flow process:
1. near FDD-LTE base station frequency point search mask system, according to the handling process shown in Fig. 2, receive PSS, SSS synchronizing signal that FDD-LTE base station sends, shielding harness is synchronizeed with FDD-LTE base station, and obtain frame timing information and physical-layer cell identifier information
2. according to the handling process shown in Fig. 3, receive the PBCH information that FDD-LTE base station sends, obtain transmitting antenna port number AP and the downstream transmission bandwidth Bw of FDD-LTE base station by the mode of blind Detecting.
3. according to the each parameter information obtaining in step 1,2, generate and disturb CRS sequence, this sequence is used a certain fixing pseudo random sequence s different from FDD-LTE base station CRS sequence
l(m), and after QPSK modulation need to carry out phase rotating.The differential seat angle of the CRS signal rotation in the OFDM symbol of adjacent carrying CRS is not 0.Disturb CRS sequence to be expressed as:
s
l(m)＝s
l-1(m)·e
jα
4. by the interference CRS sequence generating
be mapped to the RE identical with the CRS of FDD-LTE base station transmission upper, as shown in Figure 5.Running time-frequency resource position and antenna port quantity AP and the physical-layer cell identifier information of the concrete mapping of CRS
relevant, its bandwidth taking is whole downstream transmission bandwidth Bw.Described running time-frequency resource is that the shared running time-frequency resource of CRS sequence sending with FDD-LTE base station is identical.
After the conversion of frequency domain-time domain data, on corresponding frequency, going out with certain power emission, make terminal in target shielding area receive CRS power that shielding harness sends and be not less than the CRS power that the FDD-LTE base station that receives sends.
So far, shielding harness has completed the signal shielding to blind zone intra domain user by jamming program of the present invention.
The embodiment of the present invention also provides a kind of LTE signal shielding system based on CRS, in order to realize the above-mentioned LTE signal shielding method based on CRS.Fig. 6 has provided the functional block diagram of this system, and wherein the function of each component units is as follows:
Frequency sweep unit, for searching for the frequency point information of LTE base station of target shielding area;
Base station signal receiving element, for the synchronizing signal and the PBCH information that receive and demodulation LTE base station sends, obtains frame timing, physical-layer cell identifier
antenna port is counted the information such as AP, CP length (conventional CP or expansion CP) and downstream transmission bandwidth Bw;
Interference signal generation unit, produces for the each parameter information obtaining according to base station signal receiving element the interference CRS sequence meeting the demands
compared with the local CRS sequence sending with LTE base station phase rotating one be not 0 angle [alpha];
Interference signal transmitting element, the interference CRS sequence that interference signal generation unit is obtained
through the handling process of transmitting terminal, according to specific running time-frequency resource mapping mode, on corresponding frequency, go out with certain power emission.
Description of the invention provides for example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Obviously, those of ordinary skill in the art can carry out various changes and distortion and not depart from the spirit and principles in the present invention example of the present invention.Selecting and describing embodiment is for better explanation principle of the present invention and practical application, thereby and makes those of ordinary skill in the art can understand the present invention's design to be suitable for the various embodiment with various amendments of special-purpose.
Claims (7)
1. the LTE signal shielding method based on CRS, is applicable to the LTE system of shielding harness, base station, terminal composition, comprises the following steps:
1) shielding harness is searched for the frequency of the base station to the Terminal Service in target shielding area, receives PSS, SSS synchronizing signal that base station sends, synchronizes, and obtain frame timing information and physical-layer cell identifier information with base station;
2) shielding harness receives the PBCH information of all base stations that search, and obtains transmitting antenna port number, CP length and the downstream transmission bandwidth of each community;
3) shielding harness is according to step 1), 2) in each parameter information of obtaining, generate and disturb CRS sequence for each community respectively;
4) that the interference CRS sequence of each community generating is mapped to respectively to the RE identical with the CRS of respective cell is upper for shielding harness, and converts time domain data to and launching on corresponding frequency.
2. the LTE signal shielding method based on CRS according to claim 1, is characterized in that step 1) in, for single-frequency list cell conditions, the base station frequency point that shielding harness searches only has one, and under this frequency, only has Yi Ge community; For common frequency multi-cell situation, the base station frequency point that shielding harness searches only has one, but under this frequency, has multiple communities; For the many cell conditions of multifrequency, the base station frequency point that shielding harness searches has multiple, and the number of cells under each frequency is more than or equal to one.
3. the LTE signal shielding method based on CRS according to claim 1, is characterized in that step 3) in, described interference CRS sequence meets following condition:
The pseudo random sequence that 3-1) the local CRS sequence of use Yu Zhe community transmission is identical or the different pseudo random sequence of local CRS sequence that uses a certain fixing Yu Zhe community to send;
3-2) described interference CRS sequence is modulated laggard line phase rotation through QPSK, and the differential seat angle of the CRS signal rotation in the OFDM symbol of adjacent carrying CRS is not 0.
4. the LTE signal shielding method based on CRS according to claim 1, is characterized in that step 4) in, for single-frequency list cell conditions, convert the frequency domain data after mapping to time domain data and launch on corresponding frequency; For common frequency multi-cell situation, based on the reference signal strength that receives each cell signal, will disturb the CRS signal of each community to be weighted stack, then convert time domain data to and launching on corresponding frequency; For the many cell conditions of multifrequency, according to the difference of number of cells under each frequency, process respectively according to single-frequency list community and two kinds of common frequency multi-cells situation.
5. the LTE signal shielding method based on CRS according to claim 1, is characterized in that step 4) in, the terminal in target shielding area receives the CRS power that shielding harness sends and is not less than the CRS power that the LTE base station that receives sends.
6. the LTE signal shielding method based on CRS according to claim 1, is characterized in that, the terminal in described target shielding area both can also can be in RRC-CONNECTED state in RRC-IDLE state.
7. according to the LTE signal shielding method based on CRS described in claim 1-6 any one, it is characterized in that, described shielding harness comprises,
Frequency sweep unit, in order to search near LTE base station frequency point information target shielding area;
Base station signal receiving element, for the PSS, SSS synchronizing signal and the PBCH information that receive and demodulation LTE base station sends, obtains frame timing information, physical-layer cell identifier information, antenna port number, CP length and downstream transmission bandwidth;
Interference signal generation unit, produces and disturbs CRS sequence for the each parameter information obtaining according to base station signal receiving element;
Interference signal transmitting element, the interference CRS sequence that interference signal generation unit is obtained, through the processing of transmitting terminal, is launched on corresponding frequency.
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| CN106685574A (en) * | 2016-12-23 | 2017-05-17 | 上海斐讯数据通信技术有限公司 | Signal shielding method and device |
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| CN106921993A (en) * | 2017-02-07 | 2017-07-04 | 京信通信系统（广州）有限公司 | The screen method and device of a kind of wireless communication system |
| CN107171766A (en) * | 2017-07-21 | 2017-09-15 | 中国电子科技集团公司第二十九研究所 | A kind of LTE signal shielding methods and system based on system information |
| CN110474703A (en) * | 2019-07-25 | 2019-11-19 | 中国电子科技集团公司第二十九研究所 | The generation of multiple cell information source, sending method and equipment for LTE signal shielding system |
| CN110474703B (en) * | 2019-07-25 | 2022-09-06 | 中国电子科技集团公司第二十九研究所 | Multi-cell information source generating and sending method and equipment for LTE signal shielding system |
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| CN111817816A (en) * | 2020-07-06 | 2020-10-23 | 武汉虹信通信技术有限责任公司 | NR signal shielding method and system |
| CN111817816B (en) * | 2020-07-06 | 2024-01-30 | 武汉虹信科技发展有限责任公司 | NR signal shielding method and system |
| CN112187694A (en) * | 2020-09-24 | 2021-01-05 | 国家无线电监测中心 | DMRS-based mobile phone terminal signal shielding method and system |
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| CN104158619B (en) | 2017-09-29 |
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