CN105049148A - LTE (Long Term Evolution) interference method and LTE interference system based on synchronization signals - Google Patents
LTE (Long Term Evolution) interference method and LTE interference system based on synchronization signals Download PDFInfo
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- CN105049148A CN105049148A CN201510284229.7A CN201510284229A CN105049148A CN 105049148 A CN105049148 A CN 105049148A CN 201510284229 A CN201510284229 A CN 201510284229A CN 105049148 A CN105049148 A CN 105049148A
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Abstract
The invention discloses an LTE (Long Term Evolution) interference method and an LTE interference system based on synchronization signals, which mainly comprises two schemes. According to the two schemes, 1) a shielding system does not need to be synchronized with a base station, that is, the shielding system searches frequency point information in a shielded area and sends one or more groups of PSS (Primary Synchronization Signal) or SSS (Secondary Synchronization Signal) interference signals by a certain frequency at or near a frequency point position where LTE signals main exist; and 2) synchronization information of the base station needs to be acquired, that is, frequency point information of the base station in the shielded area is searched, PSSs and SSSs sent by the base station are received, the shielding system is enabled to realize synchronization with the base station, and frame timing information and physical layer cell identity of a cell are acquired; the shielding system generates one or more groups of PSS or SSS interference signals according to the acquired physical layer cell identity; and the shielding system sends one or more groups of interference signals in a specific time-frequency domain range. The method and the system provided by the invention are low in transmitting power, and have no influences for the health of a human body. Meanwhile, the method and system do not affect an uplink channel and apply no interference to users in an unshielded area.
Description
Technical field
The present invention relates to a kind of LTE interference method based on synchronizing signal and system, belong to wireless mobile telecommunication technology field.
Background technology
The mobile phone problem of divulging a secret becomes increasingly conspicuous in recent years.In the occasion that some are special, as secret meeting room, government department, military service, need to shield mobile phone signal, cut off mobile phone and write to each other, in case information leakage with extraneous; For another example, in examination hall, use cellular phone signal shielding device effectively can stop examinee and use wireless communication facility cheating etc.In order to ensure information security or meet some particular demands, mobile phone signal interference unit has been widely used in routine work and life.
Visible cellular phone signal shielding device is of a great variety in the market, transmitting power, interference band, coverage are different, modal signal shielding device is power compacting interference unit, disturb mobile phone signal by sending powerful white noise, this perturbation technique is that the signal to noise ratio by reducing mobile phone Received signal strength realizes.The equivalent isotropically radiated power of indoor interference unit is not generally from tens watts to tens watts etc.; in practical application scene; do not reach country " electromagnetic radiation protection regulation " and industry " radiation environment conservative management directive/guide-electromagnetic radiation environment effect appraise method and standard ", the environment being in signal shielding for a long time will certainly affect the healthy of people.
Along with LTE (LongTermEvolution, Long Term Evolution) widespread deployment, LTE mobile phone signal interference unit receives to be paid attention to widely, and LTE mobile phone signal EVAC (Evacuation Network Computer Model) is just low towards transmitting power, interference range is large, interference effect good and do not affect the future development of up link.
Summary of the invention
Reduce the impact of health to effectively reduce interference unit transmitting power, increase interference range and interference effect, the invention provides a kind of LTE interference method based on synchronizing signal and system, the method and system are to disturb PSS (PrimarySynchronizationSignal, master sync signal) and SSS (SecondarySynchronizationSignal, auxiliary synchronous signals) be means, be applicable to TD-LTE or LTE-FDD system, all can play desirable interference effect to the terminal of RRC-CONNECTED or RRC-IDLE state.
The synchronizing signal of LTE comprises PSS signal and SSS signal, can obtain time synchronized and Frequency Synchronization to the detection of two signals, also can provide physical-layer cell identifier for terminal.In order to ensure communication, terminal needs to carry out synchronous by synchronizing signal with base station, therefore disturbs PSS signal and/or SSS signal that terminal all can be made to carry out synchronous with base station and to obtain base station configuration information, and then cannot communicate, reach the object of interference.
Based on a LTE interference method for synchronizing signal, for comprising in the system of base station, shielding harness and terminal, specific implementation step is as follows:
1) in target shielding area, obtain the frequency point information that base station may exist LTE signal, and input to shielding harness;
2) shielding harness is according to the frequency point information obtained, and generates the interference signal that one or more groups is identical with the synchronizing signal that base station sends;
3) shielding harness sends interference signal in specific time domain and frequency domain position to terminal.
Further, described synchronizing signal is PSS signal and/or SSS signal, and described interference signal is PSS interference signal and/or SSS interference signal.
Further, described synchronizing signal be PSS signal and SSS signal time, shielding harness is by the frequency point information of search base station in target shielding area, receive PSS signal and the SSS signal of base station transmission, shielding harness is made to realize synchronous with base station, obtain frame timing information and the physical-layer cell identifier of community, generate one or more groups PSS and SSS interference signal identical with the synchronizing signal that base station sends according to the physical-layer cell identifier information obtained.
Further, from time domain, the synchronizing signal that shielding harness transmission interference signal and base station send is at same OFDM (OrthogonalFrequencyDivisionMultiplexing, OFDM) in symbol (Symbol), by sending one or more groups interference signal, make the skew of interference signal and base station signal life period length.
Further, the time migration Δ Tsss of the SSS signal that time migration Δ Tpss, SSS interference signal that the skew of above-mentioned time span comprises the PSS signal that PSS interference signal sends relative to base station sends relative to base station.
Further, above-mentioned Δ Tpss and Δ Tsss is all less than the time span of an OFDM symbol.
Preferably, above-mentioned Δ Tpss and Δ Tsss is dynamic change, meets Δ Tpss ≠ Δ Tpss simultaneously.
Further, the frequency domain position that shielding harness sends interference signal is identical with the frequency of the synchronizing signal that base station sends, and the power that the terminal in target shielding area receives the interference signal that shielding harness sends is not less than the power receiving the synchronizing signal that base station sends.
Present invention also offers a kind of LTE EVAC (Evacuation Network Computer Model) based on synchronizing signal, comprise with lower unit:
Base station information acquiring unit, for obtaining the frequency point information of base station;
Interference signal generation unit: for the interference signal that the synchronizing signal generated with base station sends is identical;
Interference signal transmitting element: for sending interference signal in specific time-frequency domain position.
Further, described base station information acquiring unit comprises again frequency sweep unit and Received signal strength processing unit; Described frequency sweep unit is used for searching for the base station frequency point in shielding area; Described Received signal strength processing unit, for realizing the synchronous of shielding harness and base station, obtains frame timing information and the physical-layer cell identifier information of community.
Wherein, in cost-saving situation, also can not adopt frequency sweep unit and Received signal strength processing unit, obtain frequency point information and physical-layer cell identifier information by alternate manner, inputed to shielding harness.But interference signal generation unit and transmitting element are absolutely necessary.
Interference method of the present invention, can disturb separately PSS signal and SSS signal, also can be combined and disturb.The present invention is not only applicable to single-frequency list cell system, is applicable to the communication system of common frequency multi-cell and multifrequency multiple cell yet.
Invention advantage:
1, compared to power pressing type shielding harness, interference method of the present invention and system emission power are very low, can not have an impact to health.
2, PSS and the SSS signal owing to adopting in interference method of the present invention only takies 6 wireless resource block bandwidth (i.e. 1.08MHz), and the jamming signal bandwidth therefore generated is very narrow, is convenient to reduce costs.
3, interference method of the present invention sends interference signal and the power of interference signal is very low at down link, therefore can not affect the performance of up link.
4, after the initial synchronisation completing shielding harness and base station, can not synchronized tracking be carried out or synchronized tracking time slot can be strengthened greatly, reduce the complexity of system.
5, the interference range of interference method of the present invention and shielding harness is large, and interference effect is good.
Description of the invention provides in order to 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 change and distortion to example of the present invention and not depart from the spirit and principles in the present invention.Selecting and describing embodiment is in order to principle of the present invention and practical application are better described, and enables those of ordinary skill in the art understand the present invention thus design the various embodiments with various amendment being suitable for special-purpose.
Accompanying drawing explanation
Fig. 1 is the realization flow figure in the embodiment of the present invention one;
Fig. 2 is the time-domain position figure of the interference signal that the present invention sends;
Fig. 3 is the structured flowchart of the LTE EVAC (Evacuation Network Computer Model) of the embodiment of the present invention one;
Fig. 4 is the structured flowchart of the LTE EVAC (Evacuation Network Computer Model) of the embodiment of the present invention two.
Embodiment
Set forth embodiments of the present invention below by example, implement example and implement under premised on technical solution of the present invention, give detailed execution mode and concrete operating process.It should be noted that, only otherwise form conflict, each embodiment in the present invention and each feature in each embodiment can be combined with each other, and the technical scheme formed is all within protection scope of the present invention.
Embodiment one:
The present embodiment realizes situation according to the one of the interference method of the present invention's proposition, namely be combined PSS and SSS signal to disturb, shielding harness needs and base station synchronization, shielding harness generates and send the many group interference signal identical with base station on specific time-frequency domain position, the following detailed description of this method realization flow, realization flow as shown in Figure 1.
1, shielding harness search frequency point information
The frequency point information of shielding harness search base station in shielding area, in frequency sweep process, for the frequency searched, judges whether the correlation peak of synchronizing signal reaches the frequency sweep thresholding of setting.If be more than or equal to threshold value, then think that this frequency is effective; Otherwise this frequency is invalid frequency, continue the next frequency of search.
2, shielding harness and base station synchronization
Shielding harness receives the synchronizing information (i.e. PSS and SSS signal) that base station sends, and makes shielding harness realize synchronous with base station, obtains frame timing information and the physical-layer cell identifier of community
3, shielding harness generates interference signal
Generate many groups PSS and SSS interference signal identical with base station according to the physical-layer cell identifier information obtained, concrete generation method is as follows:
What PSS signal adopted is Zadoff-Chu sequence, and what SSS signal adopted is M sequence, physical-layer cell identifier
by PSS sequence numbering
with SSS sequence numbering
common decision, that is:
physical Cell Identifier group (0 ~ 167),
be mark (0,1,2) in group, jointly constitute 504 different physical-layer cell identifiers.
● PSS sequence d (n) is frequency domain Zadoff-Chu sequence, is produced by formula (1) formula:
Wherein, n is the arbitrary integer of 0 to 61, and u is radical exponent.Zadoff-Chu root sequence index u is provided by form 1.
Form 1: the root index producing PSS sequence
● the length that the M sequence intersection cascade that SSS sequence is 31 by two length obtains is the sequence of 62, produces according to formula (2):
Wherein, c
0(n) and c
1n () is for depending on the scrambler sequence of master sync signal;
with
with
it is the scrambler sequence obtained through different cyclic shifts by different m sequences respectively.
4, shielding harness sends interference signal
Shielding harness sends interference signal in specific time-frequency domain scope.From time domain, near the symbol (Symbol) of PSS and the SSS signal of base station transmission, send many group PSS and SSS interference signals, make the shifted by delta t of interference signal and base station signal life period length; Wherein the size of time span shifted by delta t is dynamic change, and is less than the time span of a symbol, and the time-domain position of the interference signal of transmission as shown in Figure 2; From frequency domain, the frequency of interference signal is identical with the frequency of PSS with the SSS signal that base station sends; From the power that mobile phone receives, the synchronizing signal power that the mobile phone in target shielding area receives shielding harness transmission is not less than the synchronizing signal power receiving base station and send.
So far, the embodiment one based on the jamming program of the present invention's proposition completes, and can disturb user in target shielding area.
The embodiment of the present invention one additionally provides a kind of LTE EVAC (Evacuation Network Computer Model) based on synchronizing signal, and Fig. 3 gives the structured flowchart of this system, and in this embodiment, frequency sweep unit and Received signal strength unit form base station information acquiring unit, and the function of each component units is as follows:
Frequency sweep unit: as step 1 in the present embodiment, is responsible for searching for the base station frequency point in shielding area;
Received signal strength processing unit: as step 2 in the present embodiment, major function is realize shielding harness and base station synchronous, obtains synchronizing information and physical-layer cell identifier
Interference signal generation unit: as step 3 in the present embodiment, for generating PSS and the SSS interference signal identical with base station;
Interference signal transmitting element: as step 4 in the present embodiment, is mainly used in sending interference signal in specific time-frequency domain position.
Embodiment two:
The present embodiment realizes situation according to the one of the interference method of the present invention's proposition, namely be used alone SSS signal to disturb, shielding harness does not need and base station synchronization, shielding harness generates and on specific time-frequency domain position, sends the many group interference signal identical with base station, the following detailed description of this method realization flow.
1, frequency point information and the physical-layer cell identifier of base station is obtained
By some software or instrument, the frequency point information of search base station in shielding area and physical-layer cell identifier information, determine the frequency point information and physical-layer cell identifier that may there is LTE signal, input to shielding harness.
2, shielding harness generates and sends interference signal
Shielding harness, according to the frequency point information obtained and physical-layer cell identifier, generates the SSS interference signal that many groups are identical with base station, with certain frequency frequency position or near transmission interference signal.From the power that mobile phone receives, the synchronizing signal power that the mobile phone in target shielding area receives shielding harness transmission is not less than the synchronizing signal power receiving base station and send.
The present embodiment, based on the LTE EVAC (Evacuation Network Computer Model) of synchronizing signal, as shown in Figure 4, owing to not needing and base station synchronization, can omit Received signal strength processing unit accordingly.
So far, the embodiment two based on the jamming program of the present invention's proposition completes, and can shield zone user carry out shielding interference to target.
Claims (10)
1., based on a LTE interference method for synchronizing signal, be applicable to comprise the system of base station, shielding harness and terminal, its step is as follows:
1) in target shielding area, obtain the frequency point information that base station may exist LTE signal, and input to shielding harness;
2) shielding harness is according to the frequency point information obtained, and generates the interference signal that one or more groups is identical with the synchronizing signal that base station sends;
3) shielding harness sends interference signal in the time domain set and frequency domain position to terminal.
2., as claimed in claim 1 based on the LTE interference method of synchronizing signal, it is characterized in that, described synchronizing signal is PSS signal and/or SSS signal, and described interference signal is PSS interference signal and/or SSS interference signal.
3. as claimed in claim 2 based on the LTE interference method of synchronizing signal, it is characterized in that, described synchronizing signal be PSS signal and SSS signal time, described shielding harness is by the frequency point information of search base station in target shielding area, receive PSS signal and the SSS signal of base station transmission, shielding harness is made to realize synchronous with base station, obtain frame timing information and the physical-layer cell identifier of community, generate one or more groups PSS and SSS interference signal identical with the synchronizing signal that base station sends according to the physical-layer cell identifier information obtained.
4. as claimed in claim 1 based on the LTE interference method of synchronizing signal, it is characterized in that, from time domain, the synchronizing signal that shielding harness transmission interference signal and base station send is in same OFDM symbol, by sending one or more groups interference signal, make the skew of interference signal and base station signal life period length.
5. as claimed in claim 4 based on the LTE interference method of synchronizing signal, it is characterized in that, the time migration Δ Tpsss of the SSS signal that time migration Δ Tpss, SSS interference signal that the skew of described time span comprises the PSS signal that PSS interference signal sends relative to base station sends relative to base station.
6., as claimed in claim 5 based on the LTE interference method of synchronizing signal, it is characterized in that, described Δ Tpss and Δ Tpss is all less than the time span of an OFDM symbol.
7., as claimed in claim 5 based on the LTE interference method of synchronizing signal, it is characterized in that, described Δ Tpss and Δ Tpsss is dynamic change, meets Δ Tpss ≠ Δ Tpsss simultaneously.
8. as claimed in claim 1 based on the LTE interference method of synchronizing signal, it is characterized in that, the frequency domain position that described shielding harness sends interference signal is identical with the frequency of the synchronizing signal that base station sends, and the power that the terminal in target shielding area receives the interference signal that shielding harness sends is not less than the power receiving the synchronizing signal that base station sends.
9., based on a LTE EVAC (Evacuation Network Computer Model) for synchronizing signal, comprise with lower unit:
Base station information acquiring unit, for obtaining the frequency point information of base station;
Interference signal generation unit: for the interference signal that the synchronizing signal generated with base station sends is identical;
Interference signal transmitting element: for sending interference signal in specific time-frequency domain position.
10., as claimed in claim 9 based on the LTE EVAC (Evacuation Network Computer Model) of synchronizing signal, it is characterized in that, described base station information acquiring unit comprises again frequency sweep unit and Received signal strength processing unit; Described frequency sweep unit is used for searching for the base station frequency point in shielding area; Described Received signal strength processing unit, for realizing the synchronous of shielding harness and base station, obtains frame timing information and the physical-layer cell identifier information of community.
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