CN104158619A - LTE (Long Term Evolution) signal shielding method and system based on CRS (Central Reservation System) - Google Patents

Abstract

The invention provides a CRS-based LTE signal shielding method, which is applicable to FDD-LTE and TD-LTE systems, and can achieve ideal interference effects on terminals in RRC-CONNECTED or RRC-IDLE states. The method comprises the following steps: 1) searching for frequency points of base stations serving terminals in the target shielding area, synchronizing with the base stations, and obtaining frame timing information and physical layer cell identification information; 2) receiving PBCH information of all searched base stations, Obtain the number of transmit antenna ports, CP length and downlink transmission bandwidth of each sub-district; 3) according to each parameter information obtained in steps 1), 2), generate interference CRS sequences for each sub-district respectively; 4) the interference of each sub-district to be generated The CRS sequences are respectively mapped to the same REs as the CRS of the corresponding cell, and converted into time-domain data and transmitted at corresponding frequency points.

Description

A CRS-based LTE signal shielding method and system

technical field

The present invention relates to the technical field of wireless mobile communication, in particular to a CRS-based LTE signal shielding method and system.

Background technique

With the continuous development of mobile communication technology, the leakage of mobile phone communication has also attracted much attention. Due to the openness of the wireless channel, as long as the corresponding receiving equipment is used, the call information of the mobile phone can be intercepted, and it can be located, tracked and monitored. However, in special environments such as confidential conference rooms, prisons, important national governments, and military departments, in order to prevent leakage of mobile phone communication, it is not desirable to carry out mobile phone communication. For this reason, the signal shielding system can be used to cut off the connection between the mobile phone and the base station, so that any communication tool and receiving device cannot obtain the information of the mobile phone.

Most of the currently widely used signal shielding systems are based on the power suppression mode, that is, the shielding system uses noise as an interference signal, and emits high-power broadband white noise in the frequency range that needs to be interfered or emits white noise in a frequency sweep. The signal shielding system of this mode is to reduce the signal-to-noise ratio of the signal received by the mobile phone through high-power noise, thereby blocking the communication of the mobile phone. This solution needs to transmit high-power noise in the entire frequency band, and the transmission power of the shielding system is far from meeting the requirements of the national environmental electromagnetic wave hygiene standards. Long-term exposure to the radiation of the shielding system will inevitably affect human health. Moreover, when the interference scheme is applied to a TDD (Time Division Duplex, Time Division Duplex) system, it will affect the uplink, causing interference to user communications in the non-shielded area.

Based on the above reasons, the interference mode of signaling spoofing has been paid more and more attention. The interference method is to simulate the behavior of the base station and shield the system from transmitting interference signals/signals similar to the base station signals/signals, so that the mobile phone cannot correctly decode the relevant information of the base station and block the mobile phone communication. This solution can greatly reduce the transmit power of the shielding system, and because the interference is only transmitted on the time-frequency resource where the corresponding signal/signaling is located, it will not affect the uplink. For the LTE (Long Term Evolution, long-term evolution) system, the signals/signaling that can be interfered include PSS (Primary Synchronization Signal, primary synchronization signal), SSS (Secondary Synchronization Signal, secondary synchronization signal), CRS (Common Reference Signal, public reference Signal), PBCH (Physical Broadcast Channel, Physical Broadcast Channel), PCFICH (Physical Control Format Indicator Channel, Physical Control Format Indicator Channel), etc. Among them, PSS and SSS have strong anti-interference ability, and because the mobile phone does not decode the synchronization signal in real time, the interference effect on RRC-CONNECTED users is not ideal; PBCH is only used to demodulate system information when the mobile phone accesses the network However, ideal interference effects cannot be produced for RRC-CONNECTED users.

Therefore, in order to effectively interfere with LTE signals, and considering the impact on human health and uplink interference, the present invention proposes a counterfeit interference scheme by means of interfering with CRS signals.

Contents of the invention

The invention provides a CRS-based LTE signal shielding method, which is applicable to FDD-LTE and TD-LTE systems, and can achieve ideal interference effects on terminals in RRC-CONNECTED or RRC-IDLE states.

An important function of the CRS is to perform channel estimation of the terminal, so as to realize related demodulation of downlink transmission. The CRS is transmitted in each downlink subframe and each resource block in the frequency domain, spanning the entire downlink cell bandwidth. The terminal uses the known local CRS and the received CRS sent by the base station to estimate the channel response on each RE (Resource Element, resource unit) in real time, so interfering with the CRS can prevent the terminal from correctly estimating the channel response with the base station, thereby The information sent by the base station cannot be demodulated correctly. Whether it is a terminal in the RRC-CONNECTED or RRC-IDLE state, as long as it performs downlink transmission, it needs to use CRS for channel estimation, so interfering with CRS can shield the signal of terminals in any state.

The present invention provides a kind of LTE signal shielding method based on CRS, in the LTE system that shielding system, base station, terminal form, its implementation steps are as follows:

1) Search for the frequency point of the base station serving the terminal in the target shielding area, receive the PSS and SSS synchronization signals sent by the base station, synchronize the shielding system with the base station, and obtain frame timing information and physical layer cell identification information;

For the case of single frequency and single cell, that is, there is only one base station frequency searched by the shielding system, and there is only one cell under this frequency point;

For the case of multiple cells on the same frequency, that is, there is only one base station frequency point searched by the shielding system, but there are multiple cells under this frequency point;

For the multi-frequency and multi-cell situation, that is, there are multiple base station frequency points searched by the shielding system, and the number of cells under each frequency point is greater than or equal to one.

2) The shielding system receives the PBCH information of all searched cells, and obtains the number of transmit antenna ports, CP (Cyclic Prefix, cyclic prefix) length and downlink transmission bandwidth of each cell through blind detection;

3) The shielding system generates an interference CRS sequence for each cell according to each parameter information obtained in steps 1) and 2);

The interference CRS sequence satisfies the following conditions:

3-1) Use the same pseudo-random sequence as the local CRS sequence sent by the cell or use a fixed pseudo-random sequence different from the local CRS sequence sent by the cell;

3-2) The interfering CRS sequence is subjected to phase rotation after QPSK modulation, and the angle difference between the rotation angles of the CRS signals in adjacent OFDM symbols carrying CRS is not 0;

4) The shielding system maps the generated interference CRS sequence of each cell to the same RE as the CRS of the corresponding cell, and converts it into time domain data and transmits it on the corresponding frequency point.

For the case of single frequency and single cell, the shielding system converts the mapped frequency domain data into time domain data and transmits it on the corresponding frequency point;

For the case of multiple cells on the same frequency, based on the received reference signal strength of each cell signal, the shielding system performs weighted superposition of the CRS signals interfering with each cell, and then converts them into time-domain data and transmits them on the corresponding frequency points;

For the multi-frequency multi-cell situation, according to the difference in the number of cells under each frequency point, the single-frequency single-cell and the same-frequency multi-cell situations are processed separately.

Further, the terminal in the target shielding area receives the CRS power sent by the shielding system not less than the received CRS power sent by the LTE base station.

The present invention also provides a CRS-based LTE signal shielding system, which is used to realize the above-mentioned CRS-based LTE signal shielding method, including the following units: a frequency scanning unit, which is used to search for base station frequency points serving terminals in the target shielding area Information; base station signal receiving unit, used to receive and demodulate PSS, SSS synchronization signal and PBCH information sent by the base station, obtain frame timing information, physical layer cell identification information, number of antenna ports, CP length and downlink transmission bandwidth; interference signal generation The unit is used to generate the interference CRS sequence according to the parameter information obtained by the base station signal receiving unit; the interference signal sending unit processes the interference CRS sequence obtained by the interference signal generating unit at the sending end and transmits it on the corresponding frequency point.

The signal shielding method described in the present invention is not only applicable to a single-frequency single-cell system, but also applicable to communication systems of same-frequency multi-cell and multi-frequency multi-cell communication systems. The method is not only applicable to the signal shielding of the FDD-LTE system, but also applicable to the signal shielding of the TD-LTE system. The method can not only shield users in RRC-IDLE state, but also shield users in RRC-CONNECTED state.

Beneficial effect:

The CRS-based LTE signal shielding method proposed by the present invention is a signal counterfeiting interference method. This method can not only shield user signals in different states, but also only needs to transmit interference signals on a small amount of downlink time-frequency resources, so that the transmission power of the shielding system is greatly reduced compared with the noise-suppressing shielding system. Through the product of the present invention and In the comparative test of existing products on the market, the drop rate is about 27dB, which will not cause adverse effects on human health. At the same time, this method only sends interference signals on the downlink channel, so it will not affect the base stations near the shielded area, nor will it affect the normal communication of users in the non-shielded area.

Description of drawings

Fig. 1 is the implementation flowchart of the LTE signal shielding method based on CRS in the embodiment of the present invention;

Fig. 2 is the flow chart of receiving terminal processing of synchronous signal in the embodiment of the present invention;

FIG. 3 is a flow chart of receiving end processing of a physical broadcast channel in an embodiment of the present invention;

FIG. 4 is a schematic diagram of downlink reference signal mapping under a conventional CP in an embodiment of the present invention;

FIG. 5 is a schematic diagram of downlink reference signal mapping under an extended CP in an embodiment of the present invention;

FIG. 6 is a functional block diagram of a CRS-based LTE signal shielding system in an embodiment of the present invention.

Detailed ways

The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples. The implementation cases are implemented on the premise of the technical solution of the present invention, and the detailed implementation and specific operation process are given. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

Application example 1:

This embodiment combines the TD-LTE system to describe in detail the CRS-based LTE signal shielding method proposed by the present invention under the condition of a conventional CP. The scheme flow is shown in Figure 1, and the specific implementation steps are as follows:

1. Search the TD-LTE base station frequency points near the shielding system, according to the processing flow shown in Figure 2, receive the PSS and SSS synchronization signals sent by the base station, synchronize the shielding system with the TD-LTE base station, and obtain frame timing information and Physical layer cell identification information

2. According to the processing flow shown in Figure 3, the PBCH information sent by the TD-LTE base station is received, and the number of transmit antenna ports AP and the downlink transmission bandwidth Bw of the base station are obtained through blind detection.

3. Generate an interference CRS sequence according to the parameter information obtained in steps 1 and 2, the specific steps are as follows:

●Generate the same sequence as the CRS sent by the TD-LTE base station

reference signal sequence defined as:

${\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; l</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; no</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; no</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\sqrt{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; j</span>}\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\sqrt{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; \&CenterDot;</span>\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; )</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0,1</span>}<span\; class="notranslate">\; ,</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; .</span><span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; RB</span>}}^{\mathrm{<span\; class="notranslate">\; max</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; DL</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

Among them, n _s represents the time slot number in a wireless frame; l represents the OFDM symbol sequence number in a time slot; c(m) is a pseudo-random sequence, defined as:

c(m)＝(x ₁ (m+N _C )+x ₂ (m+N _C ))mod2

x ₁ (m+31)＝(x ₁ (m+3)+x ₁ (m))mod2 (2)

x ₂ (m+31)＝(x ₂ (m+3)+x ₂ (m+2)+x ₂ (m+1)+x ₂ (m))mod2

Wherein, N _C =1600, initial value x ₁ (0)=1, x ₁ (m)=0, m=1,2,...,30, c(m) is initialized in each OFDM symbol, see formula (3).

${\mathrm{<span\; class="notranslate">\; c</span>}}_{\mathrm{<span\; class="notranslate">\; init</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; 2</span>}}^{\mathrm{<span\; class="notranslate">\; 10</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 7</span>}<span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; no</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; l</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&Center\; Dot;</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; IDce</span>}}^{\mathrm{<span\; class="notranslate">\; cell</span>}}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; \&CenterDot;</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; ID</span>}}^{\mathrm{<span\; class="notranslate">\; cell</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; CP</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; )</span>$

Wherein, in the case of conventional CP, N _CP =1.

● Generate interference CRS sequence

Compared with the CRS sequence sent by the base station, the interfering CRS sequence needs to be phase-rotated after QPSK modulation, and the angle difference α of the CRS signal rotation in adjacent OFDM symbols carrying CRS is not zero. Then the interference CRS sequence can be expressed as:

${\stackrel{<span\; class="notranslate">\; ^</span>}{\mathrm{<span\; class="notranslate">\; r</span>}}}_{\mathrm{<span\; class="notranslate">\; l</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; no</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; r</span>}}_{\mathrm{<span\; class="notranslate">\; l</span>}<span\; class="notranslate">\; ,</span>{\mathrm{<span\; class="notranslate">\; no</span>}}_{\mathrm{<span\; class="notranslate">\; the\; s</span>}}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; m</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; \&Center\; Dot;</span>{\mathrm{<span\; class="notranslate">\; e</span>}}^{\mathrm{<span\; class="notranslate">\; j\&alpha;</span>}}$

4. The generated interference CRS sequence It is mapped to the same RE as the CRS sent by the base station, as shown in FIG. 4 . Time-frequency resource location and number of antenna ports mapped by CRS specific AP and physical layer cell identification information Related, the bandwidth it occupies is the entire downlink transmission bandwidth Bw. The time-frequency resource is the same as the time-frequency resource occupied by the CRS sequence sent by the TD-LTE base station.

After frequency domain-time domain data conversion, it is transmitted at the corresponding frequency point with a certain power, so that the terminal in the target shielding area receives the CRS power sent by the shielding system not less than the received CRS sent by the TD-LTE base station power.

So far, the shielding system has completed the signal shielding of the users in the shielded area through the interference scheme described in the present invention.

Application example 2:

In this embodiment, combined with the FDD-LTE system, the CRS-based LTE signal shielding method proposed by the present invention is described in detail in the case of extended CP. The scheme flow is shown in Figure 1, and the specific implementation steps are as follows:

1. Search for the FDD-LTE base station frequencies near the shielding system, receive the PSS and SSS synchronization signals sent by the FDD-LTE base station according to the processing flow shown in Figure 2, synchronize the shielding system with the FDD-LTE base station, and obtain the frame Timing information and physical layer cell identification information

2. According to the processing flow shown in Figure 3, the PBCH information sent by the FDD-LTE base station is received, and the number of transmit antenna ports AP and the downlink transmission bandwidth Bw of the FDD-LTE base station are obtained through blind detection.

3. According to each parameter information obtained in steps 1 and 2, generate an interference CRS sequence, which uses a certain fixed pseudo-random sequence s _l (m) different from the local CRS sequence of the FDD-LTE base station, and requires Perform phase rotation. The angle difference between the rotation angles of the CRS signals in adjacent OFDM symbols bearing CRS is not zero. Then the interference CRS sequence can be expressed as:

s _l (m) = s _l-1 (m) · e ^jα

4. The generated interference CRS sequence It is mapped to the same RE as the CRS sent by the FDD-LTE base station, as shown in FIG. 5 . Time-frequency resource location and number of antenna ports mapped by CRS specific AP and physical layer cell identification information Related, the bandwidth it occupies is the entire downlink transmission bandwidth Bw. The time-frequency resource is the same as the time-frequency resource occupied by the CRS sequence sent by the FDD-LTE base station.

After frequency domain-time domain data conversion, it is transmitted at the corresponding frequency point with a certain power, so that the terminal in the target shielding area receives the CRS power sent by the shielding system not less than the received CRS sent by the FDD-LTE base station power.

So far, the shielding system has completed the signal shielding of the users in the shielded area through the interference scheme described in the present invention.

An embodiment of the present invention also provides a CRS-based LTE signal shielding system, which is used to implement the above CRS-based LTE signal shielding method. Figure 6 shows the functional block diagram of the system, in which the functions of each component unit are as follows:

A frequency scanning unit, used to search for frequency point information of LTE base stations in the target shielded area;

The base station signal receiving unit is used to receive and demodulate the synchronization signal and PBCH information sent by the LTE base station, and obtain frame timing and physical layer cell identification Information such as the number of antenna ports AP, CP length (regular CP or extended CP) and downlink transmission bandwidth Bw;

The interference signal generation unit is used to generate an interference CRS sequence that meets the requirements according to the parameter information obtained by the base station signal receiving unit Compared with the local CRS sequence sent by the LTE base station, the phase is rotated by a non-zero angle α;

The interference signal sending unit is configured to use the interference CRS sequence obtained by the interference signal generating unit After the processing flow at the sending end, according to a specific time-frequency resource mapping method, it is transmitted with a certain power at the corresponding frequency point.

The description of the present invention has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the invention in the form disclosed. Apparently, those skilled in the art can make various changes and modifications to the examples of the present invention without departing from the spirit and principle of the present invention. The embodiment was chosen and described in order to better explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention and design various embodiments with various modifications as are suited to the particular use.

Claims (7)

1. the LTE signal shielding method based on CRS, is applicable to the LTE system of shielding harness, base station, terminal composition, comprises the following steps:

1) shielding harness is searched for the frequency of the base station to the Terminal Service in target shielding area, receives PSS, SSS synchronizing signal that base station sends, synchronizes, and obtain frame timing information and physical-layer cell identifier information with base station;

2) shielding harness receives the PBCH information of all base stations that search, and obtains transmitting antenna port number, CP length and the downstream transmission bandwidth of each community;

3) shielding harness is according to step 1), 2) in each parameter information of obtaining, generate and disturb CRS sequence for each community respectively;

4) that the interference CRS sequence of each community generating is mapped to respectively to the RE identical with the CRS of respective cell is upper for shielding harness, and converts time domain data to and launching on corresponding frequency.

2. the LTE signal shielding method based on CRS according to claim 1, is characterized in that step 1) in, for single-frequency list cell conditions, the base station frequency point that shielding harness searches only has one, and under this frequency, only has Yi Ge community; For common frequency multi-cell situation, the base station frequency point that shielding harness searches only has one, but under this frequency, has multiple communities; For the many cell conditions of multifrequency, the base station frequency point that shielding harness searches has multiple, and the number of cells under each frequency is more than or equal to one.

3. the LTE signal shielding method based on CRS according to claim 1, is characterized in that step 3) in, described interference CRS sequence meets following condition:

The pseudo random sequence that 3-1) the local CRS sequence of use Yu Zhe community transmission is identical or the different pseudo random sequence of local CRS sequence that uses a certain fixing Yu Zhe community to send;

3-2) described interference CRS sequence is modulated laggard line phase rotation through QPSK, and the differential seat angle of the CRS signal rotation in the OFDM symbol of adjacent carrying CRS is not 0.

4. the LTE signal shielding method based on CRS according to claim 1, is characterized in that step 4) in, for single-frequency list cell conditions, convert the frequency domain data after mapping to time domain data and launch on corresponding frequency; For common frequency multi-cell situation, based on the reference signal strength that receives each cell signal, will disturb the CRS signal of each community to be weighted stack, then convert time domain data to and launching on corresponding frequency; For the many cell conditions of multifrequency, according to the difference of number of cells under each frequency, process respectively according to single-frequency list community and two kinds of common frequency multi-cells situation.

5. the LTE signal shielding method based on CRS according to claim 1, is characterized in that step 4) in, the terminal in target shielding area receives the CRS power that shielding harness sends and is not less than the CRS power that the LTE base station that receives sends.

6. the LTE signal shielding method based on CRS according to claim 1, is characterized in that, the terminal in described target shielding area both can also can be in RRC-CONNECTED state in RRC-IDLE state.

7. according to the LTE signal shielding method based on CRS described in claim 1-6 any one, it is characterized in that, described shielding harness comprises,

Frequency sweep unit, in order to search near LTE base station frequency point information target shielding area;

Base station signal receiving element, for the PSS, SSS synchronizing signal and the PBCH information that receive and demodulation LTE base station sends, obtains frame timing information, physical-layer cell identifier information, antenna port number, CP length and downstream transmission bandwidth;

Interference signal generation unit, produces and disturbs CRS sequence for the each parameter information obtaining according to base station signal receiving element;

Interference signal transmitting element, the interference CRS sequence that interference signal generation unit is obtained, through the processing of transmitting terminal, is launched on corresponding frequency.