CN103634067A - Communication signal jammer and realization method thereof - Google Patents

Abstract

The names of the invention in the application are a communication signal jammer and a realization method thereof. The application discloses the communication signal jammer. The communication signal jammer comprises a detection device and a jammer, wherein the detection device is used for detecting a specific part, which is related to synchronization, of each subframe of a communication signal, and a jamming signal is sent by the jammer based on the specific part. Jamming can be simply realized at a lowered cost and in a more energy saving mode through the utilization of the communication signal jammer and the realization method thereof in the application. The user equipment of a TDD (Time Division Duplex) system is prevented from staying in a mobile communication network, and meanwhile, unexpected interference can not be caused to a public mobile communication system.

Description

A kind of signal of communication shielding device and its implementation

Technical field

The present invention relates to a kind of signal of communication shielding device and its implementation, more specifically, the present invention relates to shielding device and its implementation that the signal for the local channel to subscriber equipment (UE) shields.

Background technology

Along with the fast development of mobile communication technology, the products & services that mobile communication is relevant have been goed deep into each corner of society.Mobile communication technology is bringing to people life greatly easily simultaneously, the unlawful activities such as also makes a few peoples likely utilize mobile communication technology to be engaged in to cheat at one's exam, leak state secrets.Therefore, at some as important places such as government bodies, People's Armed Police guard station, prison, schools, be necessary deployment signal shielding device, with to shielding as the signal of the mobile communications device of subscriber equipment, thereby prevent that a few peoples from utilizing mobile communication technology to be engaged in unlawful activities.

Traditional signal of communication shielding device (the most widely used subscriber equipment signal shielding device of take is example) has following characteristics conventionally: normally all the period of time, full frequency band send shielded signal; Conventionally disturb the uplink and downlink communications band of mobile communication simultaneously, thereby when reaching the object that the subscriber equipment of district's intra domain user use is shielded, also disturbed undesirably the public's normal mobile communication.

Known signal shielding device mainly contains following three kinds in the market, has respectively different defects:

1, do not distinguish the shielding device of FDD (Frequency Division Duplexing (FDD)) and TDD (time division duplex) standard, the most general implementation is that up, descending full frequency band as above disturbs.Because such shielding device disturbs upward signal and downstream signal simultaneously, therefore can public mobile communication be caused and be had a strong impact on, when reaching the object of telex network of special user equipment of shielding important area, also can have influence on the communication that does not need the normal users of shielding outside region.That is to say, this shielding device may produce less desirable interference to the information without shielding, thereby has unnecessarily reduced the overall performance of communication system.

2,, for the communication system of FDD standard, developed the signal shielding device that only disturbs downstream signal, thereby avoided the local important area start signal in base station range to shield the impact of device on base station uplink.This shielding device can be realized the down link that only disturbs FDD system, but TDD system is remained to up, descending, disturbs simultaneously, also just still has the technical problem of " producing less desirable interference ".

3, Chinese patent application 201210185140.1 (, the patent application that June 6 2012 applying date, date of publication 2012, on October 17,, publication No. were CN102739337A) a kind of time-division Synchronization Control subscriber equipment signal shielding device and screen method are disclosed, it realizes principle is by synchronizing network read broadcast channel information, to obtain the uplink and downlink time slot switching point of TDD system, by control circuit, realize and only when descending time slot occurs, send interference signal (for example, this patent application is illustrated in fig. 5) again.Although the disclosed TDD system customer equipment of patent application 201210185140.1 signal shielding device and screen method can be realized the down link that only disturbs TDD system, the technical problem that contributes to solve above-mentioned " less desirable interference ", but the realization of this patent application needs following condition: (1) obtains the uplink and downlink time slot switching point of TDD system by synchronizing network read broadcast channel information, (2) by control circuit, realize and only when descending time slot occurs, send interference signal, thus overcome to up link do not expect disturb.Yet this patent application is owing to will calculating uplink and downlink time slot switching point, so implementation procedure is very complicated, cost is also higher.In addition, apply interference due to descending time slot whole duration, so countermeasure set also needs to consume higher energy, thereby produce larger power consumption.

Therefore, this area needs a kind of improved signal of communication shielding device and its implementation, and it can be realized with the cost of simple mode, reduction and more energy-conservation mode: forbid that TDD system customer equipment resides in mobile communications network, can not cause less desirable interference to public mobile communication system simultaneously.

Summary of the invention

In order to solve above and other technical problem, present inventor analyzes for example communication system of TDD system, think for TDD system, the first step that subscriber equipment resides in mobile radio communication is to read the downlink synchronous signal that base station sends, and downlink synchronous signal has a fixing transmission timing conventionally, therefore time and frequency range that the interference signal sending according to the signal shielding device of the application's design only need to send for synchronizing signal, so just can realize simply efficiently: mobile subscriber cannot resident mobile communications network, can not cause less desirable interference to public mobile communication system simultaneously yet.

According to an aspect, a kind of shielding device for signal of communication is provided, comprising: checkout gear, its for each subframe for signal of communication, detect wherein and synchronous relevant specific part, and scrambling apparatus, it sends interference signal based on specific part.

According to another aspect, a kind of method that signal of communication is shielded is also provided, comprise the steps: each subframe for signal of communication, detect wherein and synchronous relevant specific part, and send interference signal based on specific part.

Signal of communication shielding device and its implementation of utilizing the application, realize with the cost of simple mode, reduction and more energy-conservation mode: forbid that TDD and other standard Communications System User equipment reside in mobile communications network, can not cause less desirable interference to public mobile communication system simultaneously.

Accompanying drawing explanation

When detailed description below reading with reference to accompanying drawing, will understand better these and other features of the present invention, aspect and advantage, in institute's drawings attached, similar symbol represents similar parts, in the accompanying drawings:

Fig. 1 illustrates and can shield device uses together, UE cell search process in conjunction with the application;

Fig. 2 and Fig. 3 illustrate can in conjunction with the application shield use together with device, TD-SCDMA frame structure and subframe structure;

Fig. 4 illustrates and can shield device uses together, TDD-LTE wireless frame structure in conjunction with the application;

Fig. 5 and Fig. 6 illustrate respectively can in conjunction with the application shield use together with device, the normal CP time slot of FDD/TDD LTE and expansion CP time slot;

Fig. 7 has schematically shown SSS and the PSS of the normal CP time slot format of TDD-LTE;

Fig. 8 illustrates in greater detail frame and the structure (comprise normal CP and expansion CP two kind situations) of time slot in time domain of the PSS/SSS in TDD-LTE;

Fig. 9 has schematically shown LTE cell search process;

Figure 10 has schematically shown FDD-LTE wireless frame structure;

Figure 11 has schematically shown frame and the structure of time slot in time domain of the PSS/SSS in FDD-LTE; And

Figure 12 is schematically illustrated in the wireless frame structure of the synchronizing channel in WCDMA system.

Embodiment

Below will one or more embodiment of present technique be described.For the simple and clear description to these embodiment is provided as far as possible, the true all features that realize are not described in this specification.Be to be appreciated that in any this type of true exploitation realizing, when in any engineering project or design object, must make the specific decision-making of multiple realization to reach developer's specific objective, the for example constraint relevant to system and conforming to the constraint of traffic aided, this may change to some extent for different realizations.Moreover, should be appreciated that for the those of ordinary skills that benefit from the disclosure, this type of development may be complicated and consuming time, but the regular works that are however still design, manufacture and process.

As used herein, with singulative citation and follow the element of indefinite article " " or step is appreciated that and does not get rid of a plurality of elements or step, unless expressly stated this eliminating.In addition, the present invention has no intention to be interpreted as getting rid of the existence of the extra embodiment that combines equally referenced characteristics to quoting of " embodiment ".In addition, unless separately add contrary clearly stating, " comprising " or " having " can comprise with the element of special properties or the embodiment of a plurality of elements the add ons that there is no that character.

In the following description, will shielding device and its implementation according to the embodiment of the present application be described for current common several mobile communication system.

(1) shielding device and its implementation of in conjunction with TD-SCDMA system, using

As shown in Figure 1, wherein illustrate and can shield device uses together, UE cell search process (take TD-SCDMA system as example) in conjunction with the application.For TD-SCDMA system, UE can utilize down-going synchronous field SYNC_DL in DwPTS to obtain synchronizeing with the DwPTS of a certain community, and this step normally mates to realize with the SYNC_DL electing from PN sequence receiving by one or more matched filters (or similarly installing).

As the further refinement to Fig. 1 embodiment, Fig. 2 and Fig. 3 illustrate can in conjunction with the application shield use together with device, TD-SCDMA frame structure and subframe structure.Specifically, in the embodiment shown in Fig. 2, the length of having described each system-frame is about 10ms, and generally can be divided into two isometric subframes; Each subframe can further comprise again several (for example seven) time slots (for example, being designated as TS0-TS6) and for synchronous specific part.Wherein, time slot TS0-TS6 is used for holding data, for synchronous specific part, comprises: for the DwPTS of downlink synchronization, for UpPTS and the clearance G P of uplink synchronisation.

According to a preferred embodiment, and as shown in Figure 3, subframe can be divided into a plurality of (chip), and for example 6400, so the length of each sheet equals 5ms/6400chip=0.78125 microsecond/chip.In each subframe, for the DwPTS of downlink synchronization, can comprise 96,160 and 96 for UpPTS and the clearance G P of uplink synchronisation, and the DwPTS duration is 96chips*0.78125 microsecond/chip=75 microsecond.

As is understood by persons skilled in the art, the building form of above-mentioned frame, subframe, DwPTS etc. are for the particular location of synchronous specific part, and the sheet quantity of distributing for each part that forms subframe etc. parameter is all schematic.According to actual accepted standard version or user's demand, these building forms, particular location and quantity all can be adjusted and be changed, and they can not be as the restriction to the application.

Get back to Fig. 1-Fig. 3, according to the particular location of DwPTS defined above, by detecting the DwPTS of certain subframe according to the application's checkout gear (not shown); Then, according to Fig. 1, can recognize in the case and (for example detect PCCPCH information without continuing, without detecting UpPTS), only need be at DwPTS in the duration, by sending interference signal according to the application's scrambling apparatus (not shown), can reach the synchronously object of this community of mobile phone.That is to say, the application's signal of communication shielding device comprises the combination of checkout gear and scrambling apparatus, by allowing the detection of scrambling apparatus based on checkout gear and only carry out scrambling at the time durations of the specific part relevant with down-going synchronous, (can finally reach only disturbs this jamming equipment, shielding device) object of the cellphone subscriber's communication in coverage, thus the impact of jamming equipment on communication user outside region reduced to greatest extent.

How to adopt checkout gear (for example, DwPTS) to detect, and how to adopt specific algorithm generation scrambler all to belong to this area common technology, do not repeat them here the synchronizing signal in radio frames.

(2) shielding device and its implementation of in conjunction with TDD-LTE system, using

Fig. 4 illustrates and can shield device uses together, TDD-LTE wireless frame structure in conjunction with the application.Seemingly, each TDD-LTE radio frames is also 10ms to the TD-CDMA system class of describing with Fig. 1, and each TDD-LTE radio frames can be divided into 2 isometric parts.

Be with Fig. 1 difference, above-mentioned 2 isometric parts are generally referred to as field (half-frame), and each field comprises again 4 conventional subframes and an irregular subframe (containing DwPTS, Gp, UpPTS), and the length of conventional subframe and irregular subframe is 1ms; Each conventional subframe comprises 2 time slots (time slot 0-1); Each time slot comprises as shown in Figure 57 OFDM symbols (symbol 0-6), under the time slot format of expansion CP, comprises as shown in Figure 66 OFDM symbols (symbol 0-5) under the time slot format of normal CP (Cyclic Prefix).

According to a preferred embodiment, in TDD-LTE radio frames, " irregular subframe " at DwPTS place is usually located between the 0th subframe and the 2nd subframe and between the 5th subframe and the 7th subframe, so they also can correspondingly be referred to as the 1st subframe and the 6th subframe.Fig. 7 illustrates in greater detail for normal CP time slot format positions (7 symbol 0-6 of each time slot), irregular subframe.

Still as shown in Figure 7, downlink synchronous signal for synchronous specific part comprises: (the Primary Synchronized Signal of the master sync signal in DwPTS, PSS) auxiliary synchronous signals and in conventional subframe (Secondary Synchronized Signal, SSS).The advantage that adopts primary and secondary synchronization signals be can guarantee terminal can be accurately and fast detecting go out master sync signal, and detect auxiliary synchronous signals under the prerequisite of known master sync signal, accelerate Cell searching speed.The position of PSS and SSS signal is relative fixing, and with the ascending-descending subframes configuration of TDD system, it is irrelevant that community covers the factors such as size.In addition, TDD-LTE system is supported multiple transmission bandwidth configuration, in order to guarantee that under each system bandwidth, the realization relative fixing and detection algorithm of PSS and SSS position is simplified, PSS and the SSS signal position in the whole system bandwidth 1.08MHz of central authorities (6 RB pieces) always on frequency domain.

For example, shown an embodiment of PSS and SSS signal present position under normal CP time slot format in Fig. 7, wherein PSS takies subframe 1,6 (, " irregular subframe " that comprises DwPTS) the 3rd symbol, and SSS takies last symbol of subframe 0,5.The latter half of Fig. 8 has shown an embodiment (situation that only comprises each time slot in subframe 0 and 1 of PSS and SSS signal present position under expansion CP time slot format, not shown subframe 5 and 6 situation), what wherein SSS took is subframe 0,5 the 12nd symbol is last symbol, PSS remains the 3rd symbol that takies subframe 1,6.

According to embodiment further, in Fig. 9, specifically illustrated and how based on above-mentioned PSS and SSS, to have carried out Cell searching:

(1) for the search of PSS signal

Master sync signal in TDD-LTE (PSS) adopts Zadoff-Chu sequence, and auxiliary synchronous signals adopts m sequence.No. ID, community

by main synchronizing sequence, numbered

number with secondary synchronization sequences common decision, physical relationship is

Main synchronizing sequence has comprised 3 Zadoff-Chu sequences, and sequence is a resulting sequence that length is 62 symbols after the symbol on DC subcarrier in the middle of the Zadoff-Chu sequence of length 63 is clipped.Main synchronizing sequence has the features such as low, the anti-deviation capability of moulding signal peak-to-average ratio is strong, and when initial access, first UE take the enterprising line scanning of frequency grid that 100KHz is interval in the working frequency range of its support, and on each frequency, carries out the detection of primary synchronization channel.In this course, terminal only detects on the central frequency band of 1.08MHz whether have master sync signal.

When the checkout gear (not shown) by the application detects after PSS signal, according to Fig. 9 and in conjunction with Fig. 7 or Fig. 8, those skilled in the art can understand, only need be during the 3rd symbol of the subframe 1,6 of PSS signal transmitting, by scrambling apparatus (not shown), send interference signal and can reach the synchronously object of this community of mobile phone; This scrambling mode finally reaches the object of only disturbing the cellphone subscriber's proper communication in this jamming equipment (that is, according to the application's shielding device) coverage, thereby reduces to greatest extent the impact of jamming equipment on communication user outside region.

(2) for the search of SSS signal

The sequence that the length that the m sequence intersection cascade that in TDD-LTE, subsynchronous signal (SSS) is 31 by two length obtains is 62, the scramble sequence scrambling that this modular cascade sequence is provided by PSS.The SSS of front field intersects cascade system and the SSS of rear field, and to intersect cascade system contrary, as shown in formula (2):

$\begin{array}{c}d\left(2n\right)=\left\{\begin{array}{cc}{s}_0^{\left(m_0\right)}\left(n\right)c_0\left(n\right)& \mathrm{insubframe}0\\ s_1^{\left(m_1\right)}\left(n\right)c_0\left(n\right)& \mathrm{insubframe}5\end{array}\right.\\ d(2n+1)=\left\{\begin{array}{cc}{s}_1^{\left(m_1\right)}\left(n\right)c_1\left(n\right)z_1^{\left(m_0\right)}\left(n\right)& \mathrm{insubframe}0\\ s_0^{\left(m_1\right)}\left(n\right)c_1\left(n\right)z_1^{\left(m_1\right)}\left(n\right)& \mathrm{insubframe}5\end{array}\right.\end{array}---\left(2\right)$

Wherein, 0≤n≤30.M ₀and m ₁by physical-layer cell identifier group

according to formula (3), produce:

Sequence with

by m sequence

according to formula (4) cyclic shift, obtain:

$\begin{array}{c}{s}_0^{\left(m_0\right)}\left(n\right)=\tilde{s}\left((n+m_0)\mathrm{mod}31\right)\\ s_1^{\left(m_1\right)}\left(n\right)=\tilde{s}\left((n+m_1)\mathrm{mod}31\right)\end{array}---\left(4\right)$

Wherein,

0≤i≤30, x (i) is defined as follows:

$x(\stackrel{\‾}{i}+5)=(x(\stackrel{\‾}{i}+2)+x\left(\stackrel{\‾}{i}\right))\mathrm{mod}\mathrm{2,0}\≤\stackrel{\‾}{i}\≤25---\left(5\right)$

Initial value is x (0)=0, x (1)=0, x (2)=0, x (3)=0, x (4)=1.

Two scramble sequence c ₀and c (n) ₁(n) relying on PSS to produce, is m sequence

two kinds of different cyclic shifts, be defined as follows:

$\begin{array}{c}{c}_0\left(n\right)=\tilde{c}\left((n+N_{\mathrm{ID}}^{\left(2\right)})\mathrm{mod}31\right)\\ c_1\left(n\right)=\tilde{c}\left((n+N_{\mathrm{ID}}^{\left(2\right)}+3)\mathrm{mod}31\right)\end{array}---\left(6\right)$

Wherein $N_{\mathrm{ID}}^{\left(2\right)}\∈\left\{\mathrm{0,1,2}\right\},\tilde{c}\left(i\right)=1-2x\left(i\right),$ 0≤i≤30, are defined as follows:

$x(\stackrel{\‾}{i}+5)=(x(\stackrel{\‾}{i}+3)+x\left(\stackrel{\‾}{i}\right))\mathrm{mod}\mathrm{2,0}\≤\stackrel{\‾}{i}\≤25---\left(7\right)$

Initial value x (0)=0, x (1)=0, x (2)=0, x (3)=0, x (4)=1.

Scramble sequence

with

by m sequence

cyclic shift obtains:

$\begin{array}{c}{z}_1^{\left(m_0\right)}\left(n\right)=\tilde{z}\left((n+\left({\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="HDA0000401409630000032.png,HDA0000401409630000033.png"\; state="\{\{state\}\}">m</figure-callout>}}_0\mathrm{mod}8\right))\mathrm{mod}31\right)\\ z_1^{\left(m_1\right)}\left(n\right)=\tilde{z}\left((n+\left({\mathrm{<figure-callout\; id="1"\; label="m"\; filenames="HDA0000401409630000031.png,HDA0000401409630000032.png"\; state="\{\{state\}\}">m</figure-callout>}}_1\mathrm{mod}8\right))\mathrm{mod}31\right)\end{array}---\left(8\right)$

Wherein, m ₀and m ₁be formula (3) generation value.

0≤i≤30, x (i) is defined as follows:

$x(\stackrel{\&OverBar;}{i}+5)=(x(\stackrel{\&OverBar;}{i}+4)+x(\stackrel{\&OverBar;}{i}+2)+x(\stackrel{\&OverBar;}{i}+1)+x\left(\stackrel{\&OverBar;}{i}\right))\mathrm{<figure-callout\; id="2"\; label="mod"\; filenames="HDA0000401409630000033.png,HDA0000401409630000041.png"\; state="\{\{state\}\}">\; <figure-callout\; id="0"\; label="mod"\; filenames="HDA0000401409630000032.png,HDA0000401409630000033.png"\; state="\{\{state\}\}">mod</figure-callout>\; </figure-callout>}\mathrm{2,0}\&le;\stackrel{\&OverBar;}{i}\&le;25---\left(9\right)$

Initial value is x (0)=0, x (1)=0, x (2)=0, x (3)=0, x (4)=1.

Known in conjunction with Fig. 7-8, SSS is mapped on last OFDM symbol of subframe 0 and subframe 5.The bandwidth of the 1.08M at acquisition frequency center on frequency domain, comprises 6 RB, 72 subcarriers.The same with PSS, only used pericentral 62 subcarriers of frequency, both sides respectively stay 5 subcarriers to be used as protection wave band.In this course, terminal only detects on the central frequency band of 1.08MHz whether have subsynchronous signal.

When the checkout gear (not shown) by the application detects after SSS signal, according to Fig. 9 and in conjunction with Fig. 7 or Fig. 8, only it will be appreciated by persons skilled in the art that need send interference signal at last symbol of the subframe 0,5 of SSS signal transmitting, scrambling apparatus (not shown) by the application can reach the synchronously object of this community of mobile phone; This scrambling finally reaches the object of cellphone subscriber's proper communication of only disturbing in this jamming equipment coverage, thereby reduces to greatest extent the impact of jamming equipment on communication user outside region.

(3) shielding device and its implementation of in conjunction with FDD-LTE system, using

With above-mentioned TDD-LTE system class seemingly, Figure 10-Figure 11 has schematically shown the frame structure of FDD-LTE system, wherein the radio frames of a 10ms shown in Figure 10 comprises 20 0.5ms time slots, and Figure 11 shows the radio frames of a 10ms, comprise 10 1ms subframes, and each 1ms subframe can be subdivided into again 2 0.5ms time slots.

Specifically, in FDD-LTE system, downlink synchronous signal also can be divided into master sync signal (PSS) and auxiliary synchronous signals (SSS) similarly.The advantage that adopts primary and secondary synchronization signals be can guarantee terminal can be accurately and fast detecting go out master sync signal, and detect auxiliary synchronous signals under the prerequisite of known master sync signal, accelerate Cell searching speed.

In Figure 11, provided according to a position view embodiment, PSS and SSS.Wherein, PSS takies last symbol of first time slot of first subframe of 5ms field, and SSS takies the penultimate symbol of first time slot of first subframe of 5ms field, and this position relationship is applicable to normal CP and two kinds of situations of expansion CP.The position of PSS and SSS signal is relative fixing, and with the descending sub frame configuration of FDD system, it is irrelevant that community covers the factors such as size.In addition, FDD-LTE system is supported multiple transmission bandwidth configuration, in order to guarantee that under each system bandwidth, the realization relative fixing and detection algorithm of PSS and SSS position is simplified, PSS and the SSS signal position in the whole system bandwidth 1.08MHz of central authorities (6 RB pieces) always on frequency domain.

(1) for the search of PSS signal

Master sync signal in FDD-LTE (PSS) adopts Zadoff-Chu sequence, and auxiliary synchronous signals adopts m sequence.No. ID, community

by main synchronizing sequence, numbered

number with secondary synchronization sequences

common decision, physical relationship is

Main synchronizing sequence has comprised 3 Zadoff-Chu sequences, and sequence is a resulting sequence that length is 62 symbols after the symbol on DC subcarrier in the middle of the Zadoff-Chu sequence of length 63 is clipped.Main synchronizing sequence has the features such as low, the anti-deviation capability of moulding signal peak-to-average ratio is strong, and when initial access, first UE take the enterprising line scanning of frequency grid that 100KHz is interval in the working frequency range of its support, and on each frequency, carries out the detection of primary synchronization channel.In this course, terminal only detects on the central frequency band of 1.08MHz whether have master sync signal.

Therefore, when the application's checkout gear (not shown) detects after PSS signal, known according to Fig. 9-Figure 11, during last symbol of first time slot of first subframe of the 5ms field that only need launch at PSS signal, send interference signal and can reach the synchronously object of this community of mobile phone; This finally reaches the object of cellphone subscriber's proper communication of only disturbing in this jamming equipment coverage, and reduces to greatest extent the impact of jamming equipment on communication user outside region.

(2) for the search of SSS signal

The sequence that the length that the m sequence intersection cascade that in FDD-LTE, subsynchronous signal (SSS) is 31 by two length obtains is 62, the scramble sequence scrambling that this modular cascade sequence is provided by PSS.The SSS of front field intersects cascade system and the SSS of rear field, and to intersect cascade system contrary, as shown in formula (2):

$\begin{array}{c}d\left(2n\right)=\left\{\begin{array}{cc}{s}_0^{\left(m_0\right)}\left(n\right)c_0\left(n\right)& \mathrm{insubframe}0\\ s_1^{\left(m_1\right)}\left(n\right)c_0\left(n\right)& \mathrm{insubframe}5\end{array}\right.\\ d(2n+1)=\left\{\begin{array}{cc}{s}_1^{\left(m_1\right)}\left(n\right)c_1\left(n\right)z_1^{\left(m_0\right)}\left(n\right)& \mathrm{insubframe}0\\ s_0^{\left(m_1\right)}\left(n\right)c_1\left(n\right)z_1^{\left(m_1\right)}\left(n\right)& \mathrm{insubframe}5\end{array}\right.\end{array}---\left(2\right)$

Wherein, 0≤n≤30.M ₀and m ₁by physical-layer cell identifier group

according to formula (3), produce:

Sequence

with

by m sequence

according to formula (4) cyclic shift, obtain:

$\begin{array}{c}{s}_0^{\left(m_0\right)}\left(n\right)=\tilde{s}\left((n+m_0)\mathrm{mod}31\right)\\ s_1^{\left(m_1\right)}\left(n\right)=\tilde{s}\left((n+m_1)\mathrm{mod}31\right)\end{array}---\left(4\right)$

Wherein,

0≤i≤30, x (i) is defined as follows:

$x(\stackrel{\&OverBar;}{i}+5)=(x(\stackrel{\&OverBar;}{i}+2)+x\left(\stackrel{\&OverBar;}{i}\right))\mathrm{<figure-callout\; id="2"\; label="mod"\; filenames="HDA0000401409630000033.png,HDA0000401409630000041.png"\; state="\{\{state\}\}">\; <figure-callout\; id="0"\; label="mod"\; filenames="HDA0000401409630000032.png,HDA0000401409630000033.png"\; state="\{\{state\}\}">mod</figure-callout>\; </figure-callout>}\mathrm{2,0}\&le;\stackrel{\&OverBar;}{i}\&le;25---\left(5\right)$

Initial value is x (0)=0, x (1)=0, x (2)=0, x (3)=0, x (4)=1.

Two scramble sequence c ₀and c (n) ₁(n) relying on PSS to produce, is m sequence

two kinds of different cyclic shifts, be defined as follows:

$\begin{array}{c}{c}_0\left(n\right)=\tilde{c}\left(\left({n+N}_{\mathrm{ID}}^{\left(2\right)}\right)\mathrm{mod}31\right)\\ c_1\left(n\right)=\tilde{c}\left((n+N_{\mathrm{ID}}^{\left(2\right)}+3)\mathrm{mod}31\right)\end{array}---\left(6\right)$

Wherein $N_{\mathrm{ID}}^{\left(2\right)}\&Element;\left\{\mathrm{0,1,2}\right\},\tilde{c}\left(i\right)=1-2x\left(i\right),$ 0≤i≤30, are defined as follows:

$x(\stackrel{\&OverBar;}{i}+5)=(x(\stackrel{\&OverBar;}{i}+3)+x\left(\stackrel{\&OverBar;}{i}\right))\mathrm{<figure-callout\; id="2"\; label="mod"\; filenames="HDA0000401409630000033.png,HDA0000401409630000041.png"\; state="\{\{state\}\}">\; <figure-callout\; id="0"\; label="mod"\; filenames="HDA0000401409630000032.png,HDA0000401409630000033.png"\; state="\{\{state\}\}">mod</figure-callout>\; </figure-callout>}\mathrm{2,0}\&le;\stackrel{\&OverBar;}{i}\&le;25---\left(7\right)$

Initial value x (0)=0, x (1)=0, x (2)=0, x (3)=0, x (4)=1.

Scramble sequence

with

by m sequence cyclic shift obtains:

$\begin{array}{c}{z}_1^{\left(m_0\right)}\left(n\right)=\tilde{z}\left((n+\left({\mathrm{<figure-callout\; id="0"\; label="m"\; filenames="HDA0000401409630000032.png,HDA0000401409630000033.png"\; state="\{\{state\}\}">m</figure-callout>}}_0\mathrm{mod}8\right))\mathrm{mod}31\right)\\ z_1^{\left(m_1\right)}\left(n\right)=\tilde{z}\left((n+\left({\mathrm{<figure-callout\; id="1"\; label="m"\; filenames="HDA0000401409630000031.png,HDA0000401409630000032.png"\; state="\{\{state\}\}">m</figure-callout>}}_1\mathrm{mod}8\right))\mathrm{mod}31\right)\end{array}---\left(8\right)$

Wherein, m ₀and m ₁be formula (3) generation value. 0≤i≤30, x (i) is defined as follows:

$x(\stackrel{\&OverBar;}{i}+5)=(x(\stackrel{\&OverBar;}{i}+4)+x(\stackrel{\&OverBar;}{i}+2)+x(\stackrel{\&OverBar;}{i}+1)+x\left(\stackrel{\&OverBar;}{i}\right))\mathrm{<figure-callout\; id="2"\; label="mod"\; filenames="HDA0000401409630000033.png,HDA0000401409630000041.png"\; state="\{\{state\}\}">\; <figure-callout\; id="0"\; label="mod"\; filenames="HDA0000401409630000032.png,HDA0000401409630000033.png"\; state="\{\{state\}\}">mod</figure-callout>\; </figure-callout>}\mathrm{2,0}\&le;\stackrel{\&OverBar;}{i}\&le;25---\left(9\right)$

Initial value is x (0)=0, x (1)=0, x (2)=0, x (3)=0, x (4)=1.

As previously mentioned, Figure 11 has provided the position view of PSS and SSS, and wherein SSS is mapped on the penultimate OFDM symbol of first time slot of first subframe of 5ms field (no matter being that normal CP or expansion CP are not always the case).The bandwidth of the 1.08M at acquisition frequency center on frequency domain, comprises 6 RB, 72 subcarriers.The same with PSS, only used pericentral 62 subcarriers of frequency, both sides respectively stay 5 subcarriers to be used as protection wave band.In this course, terminal only detects on the central frequency band of 1.08MHz whether have subsynchronous signal.

Therefore, when the checkout gear (not shown) by the application detects after SSS signal, known according to Fig. 9, Figure 11, during the penultimate symbol of first time slot of first subframe of the 5ms field that only need launch at SSS signal, send interference signal and can reach the synchronously object of this community of mobile phone; This finally reaches the object of cellphone subscriber's proper communication of only disturbing in this jamming equipment coverage, thereby reduces to greatest extent the impact of jamming equipment on communication user outside region.

(4) shielding device and its implementation of in conjunction with WCDMA system, using

Figure 12 is schematically illustrated in the wireless frame structure of the synchronizing channel in WCDMA system, and wherein SCH is down physical channel, and can be divided into primary synchronization channel (P-SCH, Primary SCH) and from synchronizing channel (S-SCH, Secondary SCH).Above-mentioned synchronizing channel is mainly used in UE and after start, carries out the process of slot synchronization and frame synchronization with system, to complete physical layer synchronization.

That is to say, SCH be one for carry out the down physical channel of slot synchronization and frame synchronization at cell search process UE and network, and each radio frames length of SCH is 10ms (38400), is divided into 15 time slots.Therefore, the length of each time slot is 38400/15=2560 sheet.

According to an embodiment (seeing Figure 12), P-SCH and the upper synchronous code sending of S-SCH be have been described in detail:

P-SCH is upper, and that send is synchronization codes (PSC, Primary Synchronization Code), and length is 256.PSC in the transmitting of the position of front 256 chips of each time slot once, represents with cp in the drawings.In system, the PSC of each community is identical.

S-SCH is upper, and that send is auxiliary synchronous code (SSC, Secondary Synchronization Code), and length is 256.S-SCH and P-SCH be parallel transmission in time.SSC uses c in the drawings _s ^i,krepresent, wherein i (0～63) represents the group number of main scrambler group, and k (0～14) represents timeslot number.These 15 SSC of each radio frames repeat its transmission of S-SCH.Each SSC chooses from length is 16 different chip sequences of 256.The SSC sequence sending on S-SCH has 64 kinds of definite combinations, corresponding 64 main scrambler groups, and which scrambler group the downlink scrambling code that is used to indicate community belongs to.That is to say that the SSC sequence sending on the S-SCH channel of Zhe Liangge community is so just different if the main scrambler of Liang Ge community is different.

Parameter a in figure is used to indicate P-CCPCH and whether has carried out transmit diversity, and a=+1 represents that P-CCPCH has carried out STTD transmit diversity, and a=-1 represents that P-CCPCH does not carry out STTD transmit diversity.

Preferably, SCH channel does not carry out spread spectrum and scrambling.While using transmit diversity (open loop or closed loop) on any one down physical channel of community, SCH also will be used transmit diversity.What SCH adopted is time-switching transmit diversity (TSTD) mode.

Due to each time slot only first 256 be to send P-SCH synchronizing information and S-SCH synchronizing information, therefore only need to disturb by the application's scrambling apparatus (not shown) front 256 sheets of each time slot can reach the object of the normal and Network Synchronization of interference handset, thereby disturb the specific mobile phone can not proper communication.This scrambling finally reaches the object of cellphone subscriber's proper communication of only disturbing in this jamming equipment coverage, thereby reduces to greatest extent the impact of jamming equipment on communication user outside region.

In order to guarantee the effect of countermeasure set to the radio communication of above various standards; can be according to actual needs; suitably increase the time, sheet, number of symbols of interference signal transmitting etc., this is all in the protection range of the application's claim and belong to the obvious distortion to the application.In addition, for do not need to carry out again the system type of down-going synchronous after switching in communication process, can the descending interference duration of appropriate change (as continued descending Yi Zhengwei unit disturbed one-2 minute every the indefinite durations such as 1 minute, 5 minutes, 10 minutes, 20 minutes; Cause after switching still can proper communication cellphone subscriber can not carry out proper communication at interference region because of link failure off-grid).

The application's shielding device and its implementation can according to different communication systems, only with synchronize the maximally related specific time period of this system (for example, with one or more corresponding period) DwPTS, PSS, SSS and apply and disturb at least some technical purposes that reach the application.For example, by using shielding device and its implementation of the application, can be so that the interference purpose that the application obtains be stronger, better effects and if do not affect the user's normal talking outside interference range.

Interference range is wide, influence surface is large for current low-cost interference unit (being referred to as " shielding device " in the application), thereby causes large area user to communicate by letter.Although it is descending that current expensive interference unit only disturbs, it is realized, and complicated cost is high and what disturb is not only that down-going synchronous information also comprises descending other information, and whole cell downlink is had to interference.And the application's shielding device and its implementation only only disturb descending synchronous signal channel cannot normally to pass through with the user who reaches in shielding device coverage, the very little and better effects if to network overall interference.

Although only the embodiment in conjunction with limited quantity describes the present invention in detail, easy to understand the present invention is not limited to the disclosed embodiments.More properly, the present invention can revise any amount of change, change, replacement or the equivalent arrangements to match in conjunction with not describing but with the spirit and scope of the present invention above.In addition, although described various embodiments of the present invention, it being understood that aspect of the present invention can only comprise some in the embodiment of description.Therefore, the present invention is not subject to the restriction of foregoing description, but only by the scope of claims, is limited.

Claims (10)

1. for a shielding device for signal of communication, comprising:

Checkout gear, its for each subframe for described signal of communication, detect wherein and synchronous relevant specific part, and

Scrambling apparatus, it sends interference signal based on described specific part.

2. shielding device as claimed in claim 1, is characterized in that:

Described signal of communication will be transferred into subscriber equipment or mobile terminal, and describedly synchronously only comprise that downlink is synchronous.

3. shielding device as claimed in claim 1 or 2, is characterized in that: if described signal of communication is described TD-SCDMA signal, described specific part comprises DwPTS, and described scrambling apparatus only described DwPTS duration send interference signal.

4. shielding device as claimed in claim 1 or 2, it is characterized in that: if described signal of communication is described TDD-LTE signal or described FDD-LTE signal, described specific part comprises master sync signal PSS and auxiliary synchronous signals SSS, and at least one in described PSS and described SSS of described scrambling apparatus duration or the whole subframe at described PSS and described SSS place duration send interference signal.

5. shielding device as claimed in claim 1 or 2, it is characterized in that: if described signal of communication is described WCDMA signal, described specific part comprises the upper synchronization codes PSC sending of primary synchronization channel P-SCH and from the auxiliary synchronous code SSC of synchronizing channel S-SCH transmission, and described scrambling apparatus only at least one in described PSC and described SSC duration send interference signal.

6. method signal of communication being shielded, comprises the steps:

For each subframe of described signal of communication, detect wherein and synchronous relevant specific part, and

Based on described specific part, send interference signal.

7. method as claimed in claim 6, is characterized in that:

Described signal of communication will be transferred into subscriber equipment or mobile terminal, and describedly synchronously only comprise that downlink is synchronous.

8. the method as described in claim 6 or 7, is characterized in that: if described signal of communication is described TD-SCDMA signal, described specific part comprises DwPTS, and only described DwPTS duration send interference signal.

9. the method as described in claim 6 or 7, it is characterized in that: if described signal of communication is described TDD-LTE signal or described FDD-LTE signal, described specific part comprises master sync signal PSS and auxiliary synchronous signals SSS, and in described PSS and described SSS at least one duration or the whole subframe at described PSS and described SSS place duration send interference signal.

10. the method as described in claim 6 or 7, it is characterized in that: if described signal of communication is described WCDMA signal, described specific part comprises the upper synchronization codes PSC sending of primary synchronization channel P-SCH and from the auxiliary synchronous code SSC of synchronizing channel S-SCH transmission, and only at least one in described PSC and described SSC duration send interference signal.

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