CN104158619B - A kind of LTE signal shielding methods and system based on CRS - Google Patents
A kind of LTE signal shielding methods and system based on CRS Download PDFInfo
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- CN104158619B CN104158619B CN201410386713.6A CN201410386713A CN104158619B CN 104158619 B CN104158619 B CN 104158619B CN 201410386713 A CN201410386713 A CN 201410386713A CN 104158619 B CN104158619 B CN 104158619B
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Abstract
The invention provides a kind of LTE signal shielding methods based on CRS, the screen method is applied to FDD LTE and TD LTE systems, preferable interference effect can be played to the terminal in RRC CONNECTED or RRC IDLE states.Comprise the following steps：1) search is synchronized, and obtain frame timing information and physical-layer cell identifier information to the frequency of the base station of the terminal service in target shielding area with base station；2) the PBCH information of all base stations searched is received, transmission antenna port number, CP length and the downstream transmission bandwidth of each cell is obtained；3) according to step 1), 2) in obtained each parameter information, respectively for each cell generation interference CRS sequences；4) the interference CRS sequences of each cell of generation are respectively mapped on the CRS identicals RE with respective cell, and are converted into time domain data to launch on corresponding frequency.
Description
Technical field
The present invention relates to wireless mobile telecommunication technology field, more particularly to a kind of LTE signal shielding methods based on CRS and
System.
Background technology
With continuing to develop for mobile communication technology, the problem also attention of divulging a secret of mobile communication.Due to wireless channel
With opening, as long as utilizing corresponding receiving device, it becomes possible to intercept and capture the call-information of mobile phone, and it is positioned, with
Track and monitoring.But in the particular surroundings such as concerning security matters meeting room, prison and national important government, military service, in order to prevent
Mobile communication is divulged a secret, and is not intended to that mobile communication can be carried out.Therefore, signal shielding system shutdown mobile phone and base station can be utilized
Contact so that any means of communication and receiving device can not all obtain the information of mobile phone.
The signal shielding system being widely used at present is all based on greatly the pattern of power compacting, i.e. shielding harness and made using noise
For interference signal, launch high-power broadband white noise in the frequency range for needing to disturb or launch white noise in the way of frequency sweep
Sound.The signal shielding system of this pattern is to reduce the signal to noise ratio that mobile phone receives signal by high-power noise, so as to block hand
Machine communicates.The program needs to send powerful noise in full frequency band, and the transmission power of shielding harness can not much meet state
The requirement of family's environmental electromagnetic wave sanitary standard, will certainly influence health under the radiation of shielding harness for a long time.And should
When jamming program is applied to TDD (Time Division Duplex, time division duplex) system, up-link can be impacted,
So that user's communication in unmasked region is interfered.
Based on the reason for the above, the counterfeit conflicting mode of signaling is increasingly taken seriously.The conflicting mode is by simulation
The behavior of base station, shielding harness launches the interference signal/signaling similar with base station signal/signaling so that mobile phone can not be solved correctly
Go out the relevant information of base station to block mobile communication.The program can substantially reduce the transmission power of shielding harness, and because
Only to launch interference on the running time-frequency resource where corresponding signal/signaling, up-link will not also be impacted.For
For LTE (Long Term Evolution, Long Term Evolution) system, the signal/signaling that can be disturbed has PSS (Primary
Synchronization Signal, master sync signal), SSS (Secondary Synchronization Signal, it is auxiliary same
Walk signal), CRS (Common Reference Signal, public reference signal), PBCH (Physical Broadcast
Channel, Physical Broadcast Channel), PCFICH (Physical Control Format Indicator Channel, physics control
Format indication channel processed) etc..Wherein PSS and SSS antijamming capability is stronger, and because mobile phone is not that real-time decoding is synchronous
Signal, thus it is unsatisfactory for the interference effect of RRC-CONNECTED user；PBCH is also simply in mobile phone access network
For demodulating system information, preferable interference effect can not be also produced for RRC-CONNECTED user.
Therefore, LTE signals are disturbed in order to effective, and in view of the influence to health and to uplink channel interference,
The present invention proposes a kind of to disturb CRS signals as the counterfeit formula jamming program of means.
The content of the invention
The invention provides a kind of LTE signal shielding methods based on CRS, the screen method is applied to FDD-LTE and TD-
LTE system, preferable interference effect can be played to the terminal in RRC-CONNECTED or RRC-IDLE states.
A CRS important function is the channel estimation for carrying out terminal, to realize the correlation demodulation to downlink transfer.
CRS row subframes in each of the lower, and each resource block on frequency domain is transmitted, across whole descending bandwidth of cell.Terminal profit
Each RE (Resource Element, resource list are estimated in real time with the CRS of base station transmission is received with known local CRS
Member) on channel response, therefore interference CRS terminal can be made can not correctly to estimate the channel response between base station so that nothing
Method correctly demodulates the information of base station transmission.The terminal of RRC-CONNECTED or RRC-IDLE states is either in, as long as carrying out
Downlink transfer, it is necessary to carry out channel estimation using CRS, therefore interference CRS can shield the terminal in any state
Signal.
The invention provides a kind of LTE signal shielding methods based on CRS, constituted in shielding harness, base station, terminal
In LTE system, implementation step is as follows：
1) search is to the frequency of the base station of the terminal service in target shielding area, and PSS, the SSS for receiving base station transmission are same
Signal is walked, shielding harness is synchronized with base station, and obtain frame timing information and physical-layer cell identifier information；
The base station frequency point only one of which searched for single-frequency list cell conditions, i.e. shielding harness, and under the frequency
Only one of which cell；
The base station frequency point only one of which searched for common frequency multi-cell situation, i.e. shielding harness, but have under the frequency
Multiple cells；
For many frequency multi-cell situations, i.e., the base station frequency point that shielding harness is searched has multiple, small under each frequency
Area's quantity is more than or equal to one.
2) shielding harness receives the PBCH information of all cells searched, and each cell is obtained by way of blind Detecting
Transmission antenna port number, CP (Cyclic Prefix, cyclic prefix) length and downstream transmission bandwidth；
3) shielding harness is according to step 1), 2) in obtained each parameter information, respectively for each cell generation interference CRS
Sequence；
The interference CRS sequences meet following condition：
3-1) using with this cell send local CRS sequences identical pseudo-random sequence or using a certain fixation and this
The different pseudo-random sequence of local CRS sequences that cell is sent；
3-2) the interference CRS sequences modulate the rotation of laggard line phase by QPSK, adjacent carrying CRS OFDM symbol
In CRS signal rotations differential seat angle be 0；
4) the interference CRS sequences of each cell of generation are respectively mapped to identical with the CRS of respective cell by shielding harness
RE on, and be converted into time domain data and launch on corresponding frequency.
For single-frequency list cell conditions, the frequency domain data after mapping is converted into time domain data and corresponding by shielding harness
Launch on frequency；
For common frequency multi-cell situation, based on the reference signal strength for receiving each cell signal, shielding harness will be disturbed
The CRS signals of each cell are weighted superposition, and reconvert is launched into time domain data on corresponding frequency；
For many frequency multi-cell situations, according to the difference of number of cells under each frequency, according to single-frequency list cell and with frequency
Two kinds of situations of multiple cell are handled respectively.
Further, the terminal in target shielding area receives the CRS power of shielding harness transmission not less than reception
The CRS power that the LTE base station arrived is sent.
Present invention also offers a kind of LTE signal shielding systems based on CRS, to realize the above-mentioned LTE letters based on CRS
Number screen method, including with lower unit：Frequency sweep unit, for searching for the base station frequency point to the terminal service in target shielding area
Information；Base station signal receiving unit, PSS, SSS synchronizing signal and PBCH information for receiving and demodulating base station transmission, is obtained
Frame timing information, physical-layer cell identifier information, antenna port number, CP length and downstream transmission bandwidth；Interference signal generation is single
Member, each parameter information for being obtained according to base station signal receiving unit produces interference CRS sequences；Interference signal transmitting element,
The interference CRS sequences that interference signal generation unit is obtained pass through the processing of transmitting terminal, launch on corresponding frequency.
Signal shielding method of the present invention, is applicable not only to single-frequency list cell system, while being also applied for many with frequency
Cell and the communication system of many frequency multi-cells.Methods described is applicable not only to the signal shielding of FDD-LTE systems, and is applied to
The signal shielding of TD-LTE system.Methods described can not only shield the user of RRC-IDLE states, and can shield RRC-
The user of CONNECTED states.
Beneficial effect：
LTE signal shielding methods proposed by the present invention based on CRS, are a kind of interference methods of the counterfeit formula of signal.The party
Method can not only shield the subscriber signal of different conditions, and only need in a small amount of down time-frequency transmitted on resources interference signal,
The transmission power of shielding harness is declined to a great extent compared with the shielding harness of noise pressing type, pass through the products and marketing of the present invention
The comparison test of upper existing product, fall is 27dB or so, and health will not be adversely affected.While this method
Interference signal is only sent on the downlink channel, therefore will not produce influence to the base station near shielding area, is not also interfered with non-
User's proper communication in shielding area.
Brief description of the drawings
Fig. 1 is the LTE signal shielding method implementation process figures 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 downlink reference signal mapping schematic diagram under routine CP in the embodiment of the present invention；
Fig. 5 is the downlink reference signal mapping schematic diagram under extension CP in the embodiment of the present invention；
Fig. 6 is the LTE signal shielding system functional block diagrams based on CRS in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawings and embodiment describes embodiments of the present invention in detail, case study on implementation is with the technology of the present invention
It is lower premised on scheme to be implemented, give detailed embodiment and specific operating process.As long as it should be noted that not
Constituting each embodiment in conflict, the present invention and each feature in each embodiment can be combined with each other, the skill formed
Art scheme is within protection scope of the present invention.
Application example 1：
The present embodiment combination TD-LTE system, describes the LTE proposed by the present invention based on CRS in detail in the case of conventional CP
Signal shielding method, protocol procedures are as shown in figure 1, to implement step as follows：
1. the TD-LTE base station frequency points of search mask arrangement adjacent, according to the handling process shown in Fig. 2, receive base station and send
PSS, SSS synchronizing signal, shielding harness is synchronized with TD-LTE base stations, and obtain frame timing information and physical-layer cell
Identification information
2. according to the handling process shown in Fig. 3, the PBCH information that TD-LTE base stations are sent is received, by way of blind Detecting
Obtain the transmission antenna port number AP and downstream transmission bandwidth Bw of base station.
3. according to each parameter information obtained in step 1,2, generation interference CRS sequences are comprised the following steps that：
● generation sends out CRS identical sequences with TD-LTE base stations
Reference signal sequenceIt is defined as：
Wherein, nsRepresent the timeslot number in a radio frames；L represents the OFDM symbol sequence number in a time slot；C (m) is
Pseudo-random sequence, is defined as：
C (m)=(x1(m+NC)+x2(m+NC))mod2
x1(m+31)=(x1(m+3)+x1(m))mod2 (2)
x2(m+31)=(x2(m+3)+x2(m+2)+x2(m+1)+x2(m))mod2
Wherein, NC=1600, initial value x1(0)=1, x1(m)=0, m=1,2 ..., 30,
C (m) is initialized in each OFDM symbol, sees formula (3).
Wherein, in the case of conventional CP, NCP=1.
● generation interference CRS sequences
Compared with the CRS sequences that base station is sent, need to carry out phase place after the QPSK modulation of interference CRS sequences, it is adjacent
Carrying CRS OFDM symbol in CRS signal rotations angular difference be 0.Then interference CRS sequences can be expressed as：
4. by the interference CRS sequences of generationIt is mapped on the CRS identicals RE sent with base station, as shown in Figure 4.
The running time-frequency resource position that CRS specifically maps and antenna port quantity AP and physical-layer cell identifier informationRelevant, it takes
The a width of whole downstream transmission bandwidth Bw of band.Described running time-frequency resource be with TD-LTE base stations send CRS sequences shared by when
Frequency resource is identical.
After frequency-time domain data conversion, gone out on corresponding frequency with certain power emission, make to shield in target
The CRS power that terminal in region receives shielding harness transmission is not less than the CRS power that the TD-LTE base stations received are sent.
So far, shielding harness completes the signal shielding to blind zone intra domain user by jamming program of the present invention.
Application example 2：
The present embodiment combination FDD-LTE systems, are described in detail proposed by the present invention based on CRS's in the case of extension CP
LTE signal shielding methods, protocol procedures are as shown in figure 1, to implement step as follows：
1. the FDD-LTE base station frequency points of search mask arrangement adjacent, according to the handling process shown in Fig. 2, receive FDD-LTE
Base station send PSS, SSS synchronizing signal, shielding harness is synchronized with FDD-LTE base stations, and obtain frame timing information and
Physical-layer cell identifier information
2. according to the handling process shown in Fig. 3, the PBCH information that FDD-LTE base stations are sent is received, passes through the side of blind Detecting
Formula obtains the transmission antenna port number AP and downstream transmission bandwidth Bw of FDD-LTE base stations.
3. according to each parameter information obtained in step 1,2, generation interference CRS sequences, the sequence uses a certain fixation
The pseudo-random sequence s different from FDD-LTE base stations CRS sequencesl(m), and after QPSK modulation need to carry out phase place.
The differential seat angle of CRS signal rotations in adjacent carrying CRS OFDM symbol is not 0.Then interference CRS sequences can be expressed as：
sl(m)=sl-1(m)·ejα
4. by the interference CRS sequences of generationIt is mapped on the CRS identicals RE sent with FDD-LTE base stations, such as
Shown in Fig. 5.The running time-frequency resource position that CRS specifically maps and antenna port quantity AP and physical-layer cell identifier informationHave
Close, its a width of whole downstream transmission bandwidth Bw of band taken.Described running time-frequency resource is the CRS sequences sent with FDD-LTE base stations
The shared running time-frequency resource of row is identical.
After frequency-time domain data conversion, gone out on corresponding frequency with certain power emission, make to shield in target
The CRS power that terminal in region receives shielding harness transmission is not less than the CRS work(that the FDD-LTE base stations received are sent
Rate.
So far, shielding harness completes the signal shielding to blind zone intra domain user by jamming program of the present invention.
The embodiment of the present invention additionally provides a kind of LTE signal shielding systems based on CRS, above-mentioned based on CRS to realize
LTE signal shielding methods.Fig. 6 gives the functional block diagram of the system, wherein the function of each component units is as follows：
Frequency sweep unit, the frequency point information of the LTE base station for searching for target shielding area；
Base station signal receiving unit, synchronizing signal and PBCH information for receiving and demodulating LTE base station transmission, obtains frame
Regularly, physical-layer cell identifierAntenna port number AP, CP length (conventional CP or extension CP) and downstream transmission bandwidth Bw etc.
Information；
Interference signal generation unit, each parameter information for being obtained according to base station signal receiving unit is produced to meet and required
Interference CRS sequencesThe local CRS sequences sent with LTE base station are compared to one angle [alpha] for 0 of phase place；
Interference signal transmitting element, the interference CRS sequences that interference signal generation unit is obtainedBy transmitting terminal
Handling process, according to specific time-frequency resource maps mode, is gone out on corresponding frequency with certain power emission.
Description of the invention is provided for the sake of example and description, and is not exhaustively or by the present invention
It is limited to disclosed form.Obviously, one of ordinary skill in the art can carry out various changes and change to the example of the present invention
Shape is without departing from the spirit and principles in the present invention.Selection and description embodiment be in order to more preferably illustrate the present invention principle and reality
Using, and make one of ordinary skill in the art it will be appreciated that the present invention repaiies so as to design suitable for special-purpose with various
The various embodiments changed.
Claims (6)
1. a kind of LTE signal shielding methods based on CRS, it is adaptable to shielding harness, base station, the LTE system of terminal composition, including
Following steps：
1) shielding harness search is to the frequency of the base station of the terminal service in target shielding area, receive PSS that base station sends,
SSS synchronizing signals, are synchronized with base station, and obtain frame timing information and physical-layer cell identifier information；
2) shielding harness receives the PBCH information of all base stations searched, obtains transmission antenna port number, the CP of each cell
Length and downstream transmission bandwidth；
3) shielding harness is according to step 1), 2) in obtained each parameter information, respectively for each cell generation interference CRS sequences
Row；The interference CRS sequences meet following condition：
3-1) using local CRS sequences identical pseudo-random sequence or a certain fixation of use and this cell sent with this cell
The different pseudo-random sequence of local CRS sequences sent；
3-2) the interference CRS sequences modulate the rotation of laggard line phase by QPSK, in adjacent carrying CRS OFDM symbol
The differential seat angle of CRS signal rotations is not 0；
4) the interference CRS sequences of each cell of generation are respectively mapped to the CRS identicals RE with respective cell by shielding harness
On, and be converted into time domain data and launch on corresponding frequency.
2. the LTE signal shielding methods according to claim 1 based on CRS, it is characterised in that step 1) in, for list
The single cell conditions of frequency, the base station frequency point only one of which that shielding harness is searched, and the only one of which cell under the frequency；For
Common frequency multi-cell situation, the base station frequency point only one of which that shielding harness is searched, but have under the frequency multiple cells；For many
Frequency multi-cell situation, the base station frequency point that shielding harness is searched has multiple, and the number of cells under each frequency is more than or equal to one
It is individual.
3. the LTE signal shielding methods according to claim 1 based on CRS, it is characterised in that step 4) in, for list
The single cell conditions of frequency, are converted into time domain data by the frequency domain data after mapping and launch on corresponding frequency；For same
Frequency multi-cell situation, based on the reference signal strength for receiving each cell signal, the CRS signals for disturbing each cell are weighted
Superposition, reconvert is launched into time domain data on corresponding frequency；For many frequency multi-cell situations, according under each frequency
The difference of number of cells, is handled respectively according to single-frequency list cell and two kinds of common frequency multi-cell situation.
4. the LTE signal shielding methods according to claim 1 based on CRS, it is characterised in that step 4) in, in target
The CRS power that terminal in shielding area receives shielding harness transmission is not less than the CRS work(that the LTE base station received is sent
Rate.
5. the LTE signal shielding methods according to claim 1 based on CRS, it is characterised in that the target shielding area
Interior terminal both can be at RRC-IDLE states and can also be in RRC-CONNECTED states.
6. the LTE signal shielding methods based on CRS according to claim any one of 1-5, it is characterised in that the shielding
System includes,
Frequency sweep unit, the LTE base station frequency point information of areas adjacent is shielded to search for target；
Base station signal receiving unit, PSS, SSS synchronizing signal and PBCH information for receiving and demodulating LTE base station transmission, is obtained
Obtain frame timing information, physical-layer cell identifier information, antenna port number, CP length and downstream transmission bandwidth；
Interference signal generation unit, each parameter information for being obtained according to base station signal receiving unit produces interference CRS sequences；
Interference signal transmitting element, the interference CRS sequences that interference signal generation unit is obtained pass through the processing of transmitting terminal, in phase
Launch on the frequency answered.
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104639229B (en) * | 2014-12-29 | 2018-01-19 | 中国科学院信息工程研究所 | A kind of method of sub-frame configuration in quick obtaining TD LTE systems |
| CN104639492B (en) * | 2015-02-03 | 2018-02-27 | 重庆邮电大学 | A kind of rapid detection system and method for the configuration of TD LTE ascending-descending subframes |
| CN105049148B (en) * | 2015-05-28 | 2018-07-06 | 中国科学院信息工程研究所 | A kind of LTE interference methods and system based on synchronizing signal |
| CN107466054A (en) * | 2016-06-06 | 2017-12-12 | 中兴通讯股份有限公司 | Disturb localization method, device and the base station of cell-of-origin |
| 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 |
| CN106921993B (en) * | 2017-02-07 | 2020-12-08 | 京信通信系统（中国）有限公司 | Shielding method and device 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 |
| 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 |
| CN110808823B (en) * | 2019-10-31 | 2021-09-14 | 北京紫光展锐通信技术有限公司 | Sequence mapping method and device of common reference signal, storage medium and terminal |
| 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 |
| CN112187694B (en) * | 2020-09-24 | 2022-10-28 | 国家无线电监测中心 | DMRS-based mobile phone terminal signal shielding method and system |
| CN112994834B (en) * | 2021-02-05 | 2023-03-14 | 陕西天基通信科技有限责任公司 | Method for shielding mobile signal, 5G repeater, server and storage medium |
| CN114301570A (en) * | 2022-01-28 | 2022-04-08 | 无锡神探电子科技有限公司 | Design method of novel regional LTE full-band signal shielding equipment |
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