CN203166946U - TD-SCDMA/TD-LTE downlink shielding device - Google Patents
TD-SCDMA/TD-LTE downlink shielding device Download PDFInfo
- Publication number
- CN203166946U CN203166946U CN 201320160012 CN201320160012U CN203166946U CN 203166946 U CN203166946 U CN 203166946U CN 201320160012 CN201320160012 CN 201320160012 CN 201320160012 U CN201320160012 U CN 201320160012U CN 203166946 U CN203166946 U CN 203166946U
- Authority
- CN
- China
- Prior art keywords
- unit
- signal
- interference signal
- scdma
- interference
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Abstract
The utility model discloses a TD-SCDMA/TD-LTE downlink shielding device, belonging to the field of mobile communication. The TD-SCDMA/TD-LTE downlink shielding device comprises a receiving unit, a synchronization signal conversion unit, a synchronous signal analysis unit, an interference signal generation unit, an interference signal enhancement unit, a gain adjustment unit, a digital control center, a monitoring unit and a transmission unit, wherein the receiving unit, the synchronous signal conversion unit and the synchronous signal analysis unit are connected sequentially, the synchronous signal analysis unit, the monitoring unit, the interference signal generation unit and the gain adjustment unit are respectively connected with the digital control center, and the interference signal generation unit, the interference signal enhancement unit, the gain adjustment unit and the transmission unit are sequentially connected. According to the TD-SCDMA/TD-LTE downlink shielding device, the time slot characteristics of a TD-SCDMA/TD-LTE network are fully utilized, respective time slot interference is achieved, a downlink time slot is interfered, the interference of a base station uplink signal to influence the normal working of the base station by the downlink shielding device is avoided, and the strength and the interference range of the downlink interference signal are controllable.
Description
Technical field
The utility model belongs to moving communicating field, is specifically related to a kind of TD-SCDMA/
The descending shielding device of TD-LTE.
Background technology
Information age today, development of Communication Technique is maked rapid progress, mobile communication is solely elegant as communication branch of family, playing the part of important role in every field such as people's life and industrial and agricultural productions especially, but mobile phone is lived greatly easily simultaneously bringing people, also produces the problem that some can not be ignored.Because the coverage rate of mobile communications network is very wide, in the appearance of some occasion network, the use of mobile phone makes troubles to people on the contrary, even potential safety hazard occurs, and for example: (1) becomes new leak channel, and security information is constituted a threat to safely; (2) become new pollution source of noise, disturbed the operate as normal order; (3) become new unsafe factor, production brings hidden danger to enterprise security; (4) become new means of crime, bring influence to social stability.So we very important person is destruction or limits this network in some place, the harm of avoiding the mobile network to bring, the signal shielding device arises at the historic moment under this prerequisite.
The essence of shielding device work is: the wireless network that terminal communication is depended on for existence has been implemented electromagnetic interference, terminal can't have been networked, and then also just can't accept the information that the mobile network is transmitted, but it is to the not influence of generation of terminal signaling.In the shielding device course of work with certain speed from the low side frequency of forward direction channel to high-end scanning.This sweep speed can receive in terminal and form the mess code interference in the message signals, terminal can not detect the normal data of sending from the base station, terminal can not be set up with the base station connect, terminal shows as phenomenons such as search network, no signal, no service system, thereby reaches the purpose of shielding.
In the TD-SCDMA/TD-LTE communication system, used terminal signaling shielding device is the network signal that disturbs special frequency channel, does not divide time slot to disturb, and the user can't receive signal and can not breathe out simultaneously, and the intensity of interference signal is fixed the scope inconvenience control of interference.Therefore be necessary to design a kind of shielding device that disturbs descending time slot, and interference signal intensity is controlled, interference range is controlled.
The utility model content
(1) technical problem of Xie Jueing
At above-mentioned technical problem, the utility model purpose is to provide a kind of TD-SCDMA/TD-LTE descending shielding device, and TD-SCDMA/TD-LTE communication system down link time slot is disturbed, and reaches the demand of shielded signal under the specific occasion, and interference signal intensity is controlled, and interference range is controlled.
(2) technical scheme
For realizing above purpose, the utility model is achieved by the following technical programs:
The descending shielding device of a kind of TD-SCDMA/TD-LTE comprises:
Receiving element receives the TD-SCDMA/TD-LTE signal that launch the base station;
The synchronizing signal converting unit is converted to digital signal with the TD-SCDMA/TD-LTE signal;
The synchronizing signal analytic unit is analyzed described digital signal and is obtained descending synchronous code SYNC-DL sequence;
Digital control center is used for finishing the function that needs digital processing in synchronizing signal analytic unit, interference signal generation unit and the gain adjustment unit;
The interference signal generation unit generates the wideband modulated interferer signal that disturbs the TD-SCDMA/TD-LTE descending time slot;
The interference signal enhancement unit, the outer spurious signal of the band of filtering wideband modulated interferer signal is amplified wideband modulated interferer signal intensity;
Gain adjustment unit is controlled the intensity of described interference signal by regulating gain;
Transmitter unit, the described interference signal of emission in the descending time slot of setting makes the terminal equipment can't proper communication;
Monitoring unit obtains device parameter from described digital control center, and with this reporting parameters to far-end background monitoring center;
Wherein, receiving element, synchronizing signal converting unit and synchronizing signal analytic unit are connected successively, synchronizing signal analytic unit, monitoring unit, interference signal generation unit and gain adjustment unit link to each other with described digital control center respectively, and interference signal generation unit, interference signal enhancement unit, gain adjustment unit are connected successively with transmitter unit.
Wherein said interference signal generation unit comprises saw-toothed wave generator, phase discriminator, loop filter, voltage controlled oscillator, digital to analog converter, and saw-toothed wave generator, phase discriminator, loop filter, voltage controlled oscillator and digital to analog converter link to each other successively; Phase discriminator is used for differentiating the phase difference between input signal and the output signal, and output error voltage; Noise in the error voltage and interference component are formed control voltage of voltage-controlled oscillator by the loop filter filtering.
The interference signal that wherein said interference signal generation unit produces is only disturbed the descending time slot of TD-SCDMA/TD-LTE network.
Wherein said gain adjustment unit is transitional information from the interference signal enhancement unit, finishes automatic electric-level control and isolation measuring ability, regulates the interference signal gain.
Wherein said digital control center comprises identifier, counter, analog to digital converter, digital to analog converter; Described identifier comprises shift register, adder and decision device, control synchronizing signal analytic unit is finished related operation, judge whether the synchronizing signal analytic unit determines the position of descending time slot, and the position of record descending time slot, and arrange according to the user and to determine that the shielding device sends the descending time slot position of interference signal; One or more descending time slots are realized disturbing by the sequential of analog switch control interference signal generation unit in described digital control center; The intensity that interference signal is regulated according to intensity and the phase information of the interference signal that collects in the gain adjustment unit in described digital control center is effectively controlled interference range.
(3) beneficial effect
The utility model is by providing a kind of TD-SCDMA/TD-LTE descending shielding device, realized that terminal equipment can't be communicated by letter in the regulation occasion, and accomplish only to disturb descending time slot, ascending time slot there is not influence, gain adjustment unit can be controlled the intensity of interference signal, can effectively control interference range like this, can not impact the base station; The situation of the real-time monitor interference signal of monitoring unit, as take place can in time adjust or close interference source unusually, the influence to base station work avoided.
Description of drawings
Accompanying drawing 1 is a kind of execution mode structural representation of the descending shielding device of TD-SCDMA/TD-LTE described in the utility model;
Accompanying drawing 2 is a kind of method for designing flow chart of the descending shielding device of TD-SCDMA/TD-LTE described in the utility model;
Accompanying drawing 3 is for coming the structural representation of conversion synchronization digital signal by the envelope detection method;
Accompanying drawing 4 changes the structural representation of conversion synchronization digital signal for realize signal by lower frequency changer circuit;
Accompanying drawing 5 is the structural representation of interference signal generation unit;
Accompanying drawing 6 is the time domain frame structural representation of a kind of TD-SCDMA/TD-LTE;
Accompanying drawing 7 is the sequential organization schematic diagram of 2:4 situation interfering signal maker emission interference signal for time slot proportion;
Accompanying drawing 8 is the sequential organization schematic diagram of 3:3 situation interfering signal maker emission interference signal for time slot proportion.
Embodiment
Regard to the descending shielding device of a kind of TD-SCDMA/TD-LTE and method for designing that the utility model proposes down, describe in detail in conjunction with the accompanying drawings and embodiments.
As Fig. 1, a kind of embodiment of the descending shielding device of a kind of TD-SCDMA/TD-LTE that the utility model proposes comprises:
Reception antenna receives the TD-SCDMA/TD-LTE signal that launch the base station;
The synchronizing signal converting unit is converted to digital signal with the TD-SCDMA/TD-LTE signal;
The synchronizing signal analytic unit is analyzed described digital signal and is obtained descending synchronous code SYNC-DL sequence;
Digital control center is used for finishing the function that needs digital processing in synchronizing signal analytic unit, interference signal generation unit and the gain adjustment unit;
The interference signal generation unit generates the wideband modulated interferer signal that disturbs the TD-SCDMA/TD-LTE descending time slot;
The interference signal enhancement unit, the outer spurious signal of the band of filtering wideband modulated interferer signal is amplified wideband modulated interferer signal intensity;
Gain adjustment unit is controlled the intensity of described interference signal by regulating gain;
Transmitting antenna, the described interference signal of emission in the descending time slot of setting makes the terminal equipment can't proper communication;
Monitoring unit obtains device parameter from described digital control center, and with this reporting parameters to far-end background monitoring center;
Wherein, reception antenna, synchronizing signal converting unit and synchronizing signal analytic unit are connected successively, synchronizing signal analytic unit, monitoring unit, interference signal generation unit and gain adjustment unit link to each other with described digital control center respectively, and interference signal generation unit, interference signal enhancement unit, gain adjustment unit are connected successively with transmitting antenna.
As Fig. 5, the interference signal generation unit is made up of saw-toothed wave generator, phase discriminator (PD), loop filter (LF), voltage controlled oscillator (VCO), digital to analog converter, and saw-toothed wave generator, phase discriminator, loop filter, voltage controlled oscillator and digital to analog converter link to each other successively.Phase discriminator is used for differentiating the phase difference between input signal Ui and the output signal U o, and output error voltage Ud.Noise among the Ud and interference component are formed the control voltage U c of voltage controlled oscillator (VCO) by the loop filter filtering of low pass character.By sawtooth waveforms control voltage controlled oscillator, make it to produce the swept-frequency signal in the working frequency range, each frequency sweep cycle, equal in the descending time slot of TD-SCDMA/TD-LTE working frequency range, to add a broad pulse, destroyed the exchanges data of the interior mobile phone of the area of coverage and base station, mobile phone can not get base station data, can't communicate.
Wherein digital control center is that the digital circuit that has certain budgeted capacity with MCU, DSP, FPGA, ARM etc. is core, and other storages and logical circuit are the auxiliary functional unit of realizing.Contain shift register, adder, decision device, counter, analog to digital converter, digital to analog converter etc.These functional modules can be integrated in same FPGA or the dsp chip, also can be independent FPGA or dsp chip finish deposit, function such as addition, judgement.
Following function is mainly finished at digital control center: be used for judging whether the synchronizing signal analytic unit has determined the position of descending time slot, and the position of record synchronization slot, according to the user descending time slot position that definite interference unit is used for sending interference signal is set; Form an identifier by shift register, adder and decision device, control synchronous analytic unit and finish related operation; According to the synchronizing signal that is transformed into, by the sequential of analog switch control interference signal generator, to realize only disturbing specific one or more descending time slot, ascending time slot there is not influence; Regulate the intensity of interference signal according to information such as the intensity of the interference signal that collects in the gain adjustment unit, phase places, effectively control interference range.
As Fig. 2, a kind of embodiment of the descending shielding device of a kind of TD-SCDMA/TD-LTE method for designing that the utility model proposes may further comprise the steps:
S1, receive the step of the TD-SCDMA/TD-LTE signal of base station emission by reception antenna;
S2, by the synchronizing signal converting unit described TD-SCDMA/TD-LTE signal is converted to numeral
The step of signal;
Wherein, as Fig. 3 for come the method for conversion synchronization signal by the envelope detection method: receive single antenna from the TD-SCDMA/TD-LTE signal of base station coupling part input, amplify through low noise amplifier, enter the outer spurious signal of matched filter filtering band then, carry out the detection of envelope detector then, the power signal of TD-SCDMA/TD-LTE is converted to voltage signal, and this voltage signal is converted to digital signal by the amplification of high speed amplifier by analog to digital converter.Wherein the spuious method of matched filter filtering is for making in the useful working band almost zero-decrement passing through of signal, and useful working band outer signal strength signal intensity greatly decays.
Wherein, thereby Fig. 4 is the method that realizes signal conversion conversion synchronization signal by lower frequency changer circuit: reception antenna is from the TD-SCDMA/TD-LTE signal of base station coupling part input, amplify through low noise amplifier, enter the outer spurious signal of matched filter filtering band then, by lower frequency changer circuit signal frequency is reduced to Mid Frequency, by the weighted-voltage D/A converter processing TD-SCDMA/TD-LTE signal is converted to digital signal, again by the demodulation process digital signal.
S3, synchronizing signal analytic unit are analyzed described digital signal and are obtained descending synchronous code SYNC-
The step of DL sequence;
In the TD-SCDMA/TD-LTE system, the sign indicating number of identifying cells is called descending synchronous code (SYNC-DL) sequence, and in descending pilot frequency time slot (DWPTS) emission, the base station will be in the omni-directional transmissions of residential quarter.Whole system has 32 groups of basic SYNC-DL, each base station of SYNC-DL sign and a corresponding code character (comprising 7 uplink synchronous codes, 4 scramblers and 4 intermediate codes).Further, the digital signal that synchronize conversion cell obtains enters synchronous analytic unit, analytic unit is controlled by digital control unit synchronously, form an identifier by shift register, adder and decision device, utilize this identifier that the digital signal that obtains is used for code character fixing in the digital signal that obtains and the residential quarter is carried out related operation, if the value that computing obtains during greater than given certain threshold value, is then thought and changed synchronously, namely obtain the SYNC_DL sequence of base station emission.
S4, Data Control Center are identified for sending the step of the descending time slot position of interference signal according to descending synchronous code SYNC-DL sequence;
Be the time domain frame structure chart of TD-SCDMA/TD-LTE as Fig. 6, its frame structure is divided into the subframe of two 5ms with the radio frames of 10ms, and 7 conventional time slots (TS0 ~ TS6) and 3 special time slots are arranged in each subframe.Three special time slots are respectively descending pilot frequency time slot DwPTS, main protection time slot GP and uplink pilot time slot UpPTS.TS0 is always fixing in 7 conventional time slots comes the transmitting system broadcast message as descending time slot, be the time slot that broadcast channel P-CCPCH takies alone, and TS1 always distributes to up link.The data length that has of TS0 is 865 chip lengths, accounts for 675us; The width of DwPTS is 96 chips, accounts for 75us; Main protection time slot GP length is 96 chips, accounts for 75us; Uplink pilot time slot UpPTS length is 160 chips, accounts for 125us.By the number of flexible configuration uplink and downlink timeslot, make TD-SCDMA be applicable to up-downgoing symmetry and non-symmetrical service pattern.Separated by transfer point between ascending time slot and the descending time slot.In the TD-SCDMA/TD-LTE system, the subframe of each 5ms has two transfer points: first transfer point is to forward up link to from down link, the GP of position between DwPTS and UpPTS; Second transfer point is to forward down link to from up link, and between last ascending time slot and second descending time slot, TSO is first descending time slot in each subframe in the position.Wherein, first transfer point was fixed with respect to the time started of each subframe; Second transfer point changes along with the timeslot number difference of distributing to up-downgoing.
According to this feature, we obtain the positional information of SYNC_DL then can confirm the particular location of DwPTS on time domain, can extrapolate the time slot position of TS0 thus.The synchronizing signal analytic unit can obtain the time slot allocation situation of current network by the information analysis of down-bound pilot frequency signal in addition.
S5, interference signal generation unit generate the broadband signal of disturbing the TD-SCDMA/TD-LTE descending time slot according to the descending time slot position, and Data Control Center realizes disturbing the step of one or more descending time slots by analog switch control interference signal generation unit;
The position of synchronizing information under the digital control central record, control interference signal generation unit produces interference signal, the time slot configuration situation of TD network can occur from the synchronizing signal analysis, as 2:4; 3:3 etc.The position of synchronizing information has been noted at digital control center, only disturb the descending time slot of TD-SCDMA/TD-LTE by analog switch control interference signal, as shown in Figure 7 and Figure 8, having indicated among the figure in time slot proportion is the sequential situation of 2:4 and 3:3 situation interfering signal generator emission interference signal.The interference signal generator only disturbs the descending time slot of TD network as can be seen, and this is to be realized by the sequential of digital control center by the interference signal of analog switch control.
S6, interference signal enhancement unit will generate the step of the broadband signal enhancing of disturbing the TD-SCDMA/TD-LTE descending time slot;
Radio-frequency (RF) power amplification and filter are contained in interference signal enhancement unit the inside, and interference signal is amplified, and it can effectively amplify signal under the situation that guarantees system noise and linearity, and the unwanted band of filter filtering is outer spuious in addition.
S7, gain adjustment unit are controlled the intensity of described interference signal by regulating gain, and the step of interference range is effectively controlled at digital control center;
Interference signal enters gain adjustment unit, and it is transitional information from disturb enhancement unit, finishes automatic electric-level control and isolation measuring ability, the regulating system gain; The intensity that interference signal is regulated according to intensity and the phase information of the interference signal that collects in the gain adjustment unit in digital control center is effectively controlled interference range.
S8, transmitting antenna be according to one or more descending time slots of setting among the step S5, and the broadband signal of TD-SCDMA/TD-LTE descending time slot is disturbed in emission, makes the step that terminal equipment can't proper communication;
Interference signal radiate by transmitting antenna, in the emission of TD-SCDMA/TD-LTE network descending time slot, according to user's request, disturbs the communication under the specific environment.
Especially, monitoring unit links to each other with digital control center, obtains device parameter from digital control center, and with this reporting parameters to far-end background monitoring unit.According to Rule of judgment, if take place unusually, monitoring unit can in time send alarm signal, and red LED lamp indication is turned off interference signal simultaneously and avoided influence to base station work.
The utility model has overcome existing interference unit and can not divide time slot to disturb, and user's situation about can not breathe out is in case of emergency only disturbed the descending time slot of TD-SCDMA/TD-LTE network, and ascending time slot is not had influence, can also according to circumstances control interference range.
Above execution mode only is used for explanation the utility model; and be not to restriction of the present utility model; the those of ordinary skill in relevant technologies field; under the situation that does not break away from spirit and scope of the present utility model; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present utility model, and scope of patent protection of the present utility model should be defined by the claims.
Claims (5)
1. the descending shielding device of TD-SCDMA/TD-LTE is characterized in that, comprising: receiving element receives the TD-SCDMA/TD-LTE signal that launch the base station; The synchronizing signal converting unit is converted to digital signal with the TD-SCDMA/TD-LTE signal; The synchronizing signal analytic unit is analyzed described digital signal and is obtained descending synchronous code SYNC-DL sequence; Digital control center is used for finishing the function that needs digital processing in synchronizing signal analytic unit, interference signal generation unit and the gain adjustment unit; The interference signal generation unit generates the wideband modulated interferer signal that disturbs the TD-SCDMA/TD-LTE descending time slot; The interference signal enhancement unit, the outer spurious signal of the band of filtering wideband modulated interferer signal is amplified wideband modulated interferer signal intensity; Gain adjustment unit is controlled the intensity of described interference signal by regulating gain; Transmitter unit, the described interference signal of emission in the descending time slot of setting makes the terminal equipment can't proper communication; Monitoring unit obtains device parameter from described digital control center, and with this reporting parameters to far-end background monitoring center; Wherein, receiving element, synchronizing signal converting unit and synchronizing signal analytic unit are connected successively, synchronizing signal analytic unit, monitoring unit, interference signal generation unit and gain adjustment unit link to each other with described digital control center respectively, and interference signal generation unit, interference signal enhancement unit, gain adjustment unit are connected successively with transmitter unit.
2. the descending shielding device of a kind of TD-SCDMA/TD-LTE described in claim 1, it is characterized in that: described interference signal generation unit comprises saw-toothed wave generator, phase discriminator, loop filter, voltage controlled oscillator, digital to analog converter, and saw-toothed wave generator, phase discriminator, loop filter, voltage controlled oscillator and digital to analog converter link to each other successively; Phase discriminator is used for differentiating the phase difference between input signal and the output signal, and output error voltage; Noise in the error voltage and interference component are formed control voltage of voltage-controlled oscillator by the loop filter filtering.
3. the descending shielding device of a kind of TD-SCDMA/TD-LTE described in claim 2 is characterized in that: the interference signal that described interference signal generation unit produces is only disturbed the descending time slot of TD-SCDMA/TD-LTE network.
4. the descending shielding device of a kind of TD-SCDMA/TD-LTE described in claim 1, it is characterized in that: described gain adjustment unit is transitional information from the interference signal enhancement unit, finishes automatic electric-level control and isolation measuring ability, regulates interference signal and gains.
5. the descending shielding device of a kind of TD-SCDMA/TD-LTE described in claim 1, it is characterized in that: described digital control center comprises identifier, counter, analog to digital converter, digital to analog converter; Described identifier comprises shift register, adder and decision device, control synchronizing signal analytic unit is finished related operation, judge whether the synchronizing signal analytic unit determines the position of descending time slot, and the position of record descending time slot, and arrange according to the user and to determine that the shielding device sends the descending time slot position of interference signal; One or more descending time slots are realized disturbing by the sequential of analog switch control interference signal generation unit in described digital control center; The intensity that interference signal is regulated according to intensity and the phase information of the interference signal that collects in the gain adjustment unit in described digital control center is effectively controlled interference range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320160012 CN203166946U (en) | 2013-04-02 | 2013-04-02 | TD-SCDMA/TD-LTE downlink shielding device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320160012 CN203166946U (en) | 2013-04-02 | 2013-04-02 | TD-SCDMA/TD-LTE downlink shielding device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203166946U true CN203166946U (en) | 2013-08-28 |
Family
ID=49028099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320160012 Expired - Lifetime CN203166946U (en) | 2013-04-02 | 2013-04-02 | TD-SCDMA/TD-LTE downlink shielding device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203166946U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248448A (en) * | 2013-04-02 | 2013-08-14 | 陕西天基通信科技有限责任公司 | TD-SCDMA/TD-LTE downlink shielding device and design method thereof |
| CN105450328A (en) * | 2016-01-06 | 2016-03-30 | 上海创远仪器技术股份有限公司 | Distributed mobile phone signal shielding device |
| CN106161314A (en) * | 2015-03-31 | 2016-11-23 | 中国移动通信集团公司 | Wireless signal interference method and device |
| CN106899374A (en) * | 2017-02-07 | 2017-06-27 | 京信通信系统（广州）有限公司 | A kind of screen method and device of Long Term Evolution LTE communication system |
-
2013
- 2013-04-02 CN CN 201320160012 patent/CN203166946U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248448A (en) * | 2013-04-02 | 2013-08-14 | 陕西天基通信科技有限责任公司 | TD-SCDMA/TD-LTE downlink shielding device and design method thereof |
| CN106161314A (en) * | 2015-03-31 | 2016-11-23 | 中国移动通信集团公司 | Wireless signal interference method and device |
| CN105450328A (en) * | 2016-01-06 | 2016-03-30 | 上海创远仪器技术股份有限公司 | Distributed mobile phone signal shielding device |
| CN105450328B (en) * | 2016-01-06 | 2018-11-27 | 上海创远仪器技术股份有限公司 | Distributed cellular phone signal shielding device |
| CN106899374A (en) * | 2017-02-07 | 2017-06-27 | 京信通信系统（广州）有限公司 | A kind of screen method and device of Long Term Evolution LTE communication system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103248448A (en) | TD-SCDMA/TD-LTE downlink shielding device and design method thereof | |
| CN102868421B (en) | The signal shielding method of wireless communication system, Apparatus and system | |
| CN102739337B (en) | A kind of time division synchronous controls cellular phone signal shielding device and screen method | |
| CN103188028B (en) | A kind of signal interference method and signal disturbing device | |
| CN203166946U (en) | TD-SCDMA/TD-LTE downlink shielding device | |
| CN1988413B (en) | Synchronous method and device for time division duplex communication system | |
| CN111770505B (en) | Communication control unit, near-end connection module, far-end covering module and indoor distribution system | |
| CN106253942B (en) | Mobile phone uplink signal detecting system based on TD-LTE TDD modes | |
| CN202586997U (en) | Time division synchronization control mobile phone signal shielding device | |
| CN101267610B (en) | Method and device for synchronization of mobile communication micro base station or indoor base station | |
| KR20190048787A (en) | Method And Apparatus for Managing Beam Index | |
| CN104753625B (en) | TD LTE downstream signal interference units | |
| CN101232655A (en) | Method for switching uplink and downlink works of TD-SCDMA straight amplifying station and straight amplifying station | |
| CN101197613B (en) | Method and system for anti-interference synchronization | |
| CN101931452B (en) | Digital repeater with frequency hopping function and method for achieving synchronous frequency hopping | |
| CN203661082U (en) | TD-SCDMA/TD-LTE time slot synchronous low interference signal shielding terminal | |
| CN102378202A (en) | Radio network coverage method, device and system | |
| CN204733174U (en) | A kind of frequency domain blocking type wireless signal occluding device | |
| CN106375059B (en) | A kind of TD-LTE cellular phone signal shielding devices synchronization realizing method | |
| CN107359958B (en) | Frequency agility intelligence jammer | |
| CN201118584Y (en) | A TD-SCDMA trunk amplifier | |
| CN201479134U (en) | GSM wireless repeater station with ascending noise inhibition function | |
| CN203590465U (en) | Indoor and outdoor distribution system of wireless communication signal | |
| CN204795619U (en) | Network deployment device that radio signal blocked | |
| CN113691347A (en) | Mobile phone signal shielding method and system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A TD-SCDMA / TD-LTE downlink shield Effective date of registration: 20210927 Granted publication date: 20130828 Pledgee: Pudong Development Bank of Shanghai Limited by Share Ltd. Xi'an branch Pledgor: SHAANXI TIANJI COMMUNICATION TECHNOLOGY Co.,Ltd. Registration number: Y2021610000242 |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130828 |