CN101102556A - A method for reducing interference of GSM direct end uplink noise on base station - Google Patents
A method for reducing interference of GSM direct end uplink noise on base station Download PDFInfo
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- CN101102556A CN101102556A CNA2007100525048A CN200710052504A CN101102556A CN 101102556 A CN101102556 A CN 101102556A CN A2007100525048 A CNA2007100525048 A CN A2007100525048A CN 200710052504 A CN200710052504 A CN 200710052504A CN 101102556 A CN101102556 A CN 101102556A
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Abstract
The method features the following: in the repeater uplink, the radio signals are separated based on frequency point; making power detection for each separated signal frequency point signal; converting each route RF signal into a DC envelope signal; according to the GSM physical layer protocol, the control unit makes sampling judgment for each route envelop signals to decide if each channel is occupied; if yes, then opening the uplink; if not, then cutting off the uplink or attenuating the gain of uplink in order to suppress the uplink noise guided into the base station.
Description
Technical field
The present invention relates to a kind of direct end uplink noise that reduces and donor base station is produced the method for disturbing.This method is applicable to the GSM mobile communications network of not opening frequency hopping function.
Background technology
GSM is most widely used general, network size is maximum, the user is maximum a kind of technical standard in the second generation mobile communication system.Its adopts time division multiple access (TDMA) technology, and this technology is in frequency---formed a matrix on the time relationship, and each channel being corresponding to its a frequency---point on the time matrix.
The GSM Mobile communication direct base station is actually a kind of two-way signaling amplifier, plays a part to extend base station range and mends blind.As a kind of signal relay equipment, the repeater provides better covering effect of signals.But because the repeater is a kind of active equipment, it self upstream noise can be introduced into donor base station, thereby reduces the receiving sensitivity of donor base station receiver, reduces the coverage of donor base station, serious even rising that can cause the cutting off rate and the error rate.This problem has restricted the application and the development of repeater, never is resolved.
Summary of the invention
The purpose of this invention is to provide a kind of GSM of reducing direct end uplink noise and the base station is produced the method for disturbing, the present invention is under the prerequisite that guarantees the repeater operate as normal, control the break-make of up link in the time slot of this channel according to the seizure condition of up channel, avoid the upstream noise of repeater that donor base station is produced and disturb.
The present invention solves this technical problem the technical scheme that is adopted: a kind of GSM of reducing direct end uplink noise produces the method for disturbing to the base station, it is characterized in that:
A, utilize the frequency-selecting module that the Signal Separation of different frequent points in the repeater equipment up link is come out.Respectively each frequency signal is carried out power detection, output envelope rectified signal, the amplitude of envelope detection signal characterizes the power level of radiofrequency signal;
B, control unit obtain the time slot locating information of each each channel of frequency according to the information of base station broadcast channel, in each channel time slot the envelope detection signal are carried out sample analysis, judge that according to GSM physical layer protocol and rectified signal size each channel has or not occupied;
C, control unit provide control signal according to the occupied information of channel: if time slot has CU, then open the amplifier in the up link or keep up gain constant, guarantee the proper communication of repeater and donor base station; If time slot not by CU, then turn-offs the amplifier in the up link or the up gain that decays, do not allow upstream noise introduce donor base station.
The present invention analyzes from up link coupling upward signal, according to gsm protocol, in the GSM voice communication, be to reduce transmitting power, is transmitting power not when the user is silent, and detect less than power signal this moment.But in order to keep link to connect, terminal can be given the base station in uplink transmit signals in a multiframe period.As seen, by analysis, can obtain the occupied information of channel easily to upward signal.And mainly introduce by up link the interference of donor base station the repeater.By upward signal is analyzed, directly control the break-make of up link, can suppress the interference of the upstream noise generation of repeater effectively.
The present invention separates by frequency upward signal, at each channel place time slot of each road signal the detection envelope signal is analyzed, and it is occupied to judge that each channel has or not.Owing to adopt in the wireless communication system of time division multiple access, on same carrier wave, have or not the length of user's communication and air time can be directly to reflect from the intensity of carrier signal.Utilize this characteristic, we can recognize the situation that takies of each channel from the size of detection envelope signal under the situation of restituted signal not.This mode implements very simple, economy.
Control unit of the present invention turn-offs the amplifier or the up gain that decays in the up link according to the channel occupancy information of obtaining, and does not allow upstream noise introduce donor base station, reduces the purpose of disturbing to reach.The interference that the base station receives from the repeater is meant that mainly voice channel receives the upstream noise of repeater under idle pulley, therefore we can be under the unappropriated situation of voice channel, turn-off amplifier or decay uplink gain in the up link, do not allow noise introduce the base station, thereby reduce the interference of repeater the base station.
The present invention compares advantage, characteristics or the good effect that is had with prior art:
In the application of repeater, often reduce the uplink interference of repeater at present to donor base station by the approach such as engineering opening gain of optimizing repeater noise factor index, reduction repeater.But these methods all can't fundamentally solve the uplink interference problem of repeater to the base station.
The present invention suppresses the interference of direct end uplink noise to the base station by the Based Intelligent Control to up link under the prerequisite that guarantees the repeater operate as normal.The present invention is by judging whether the channel (time slot) of each carrier frequency is occupied, according to the break-make of the State Control up link of channel (time slot).When up channel (time slot) is occupied, open up link, guarantee the proper communication of mobile subscriber and base station; When channel (time slot) is unoccupied, disconnect up link, avoid the direct end uplink noise to be introduced into donor base station, reduce the purpose of disturbing to reach.The present invention has fundamentally solved the repeater and easily donor base station has been produced this problem of uplink interference, and the very big market space is arranged in actual applications.
Description of drawings
Fig. 1, the embodiment of the invention reduce the method schematic diagram of GSM repeater to the uplink interference of donor base station.
Concrete execution mode
Drawings and Examples herein are that example is introduced this method with GSM four carrier wireless discharging-directly station.This method is applicable to the repeater of any type, is applicable to the repeater of any carrier frequency number.
Fig. 1 is the implementation (with four carrier equipment is example) of the present invention in the GSM repeater, and this scheme realizes in the up link of repeater, is the uplink portion of repeater among the figure, and the down link of repeater is with traditional repeater.
As shown in the figure, up radio frequency link is made up of radio frequency connecting line 1, amplifier 2, radio frequency connecting line 3, four carrier frequency-selecting detection module 4, radio frequency connecting line 5, amplifier 6, radio frequency connecting line 7; FEEDBACK CONTROL chain route four carrier frequency-selecting detection module 4, four road holding wires 8, control unit 9, control signal wire 10 are formed.
Four carrier frequency-selecting detection module 4 is finished following work: isolate the signal of four road different frequent points, main signal is delivered to amplifier 6 by radio frequency link 5, and the coupling unit signal carries out power detection after holding wire 8 is given control panel 9.
Control unit 9 is finished following work: according to the GSM physical layer protocol detected four road signals are analyzed, controlled the break-make or the gain of four tunnel up links according to the state (have or not and take) of each channel.(be in frequency-selecting detection module, to control break-make among the figure, use under the situation of separating amplifier also and can realize the control of each link) by turn-offing amplifier in each link at each frequency signal
Idiographic flow is as follows:
Upward signal is after amplifier 2 amplifies, deliver in the four carrier frequency-selecting detection module 4 through radio frequency connecting line 3, module is carried out frequency to the received signal and is selected, with Signal Separation is the signal of four road different frequent points, four road signals are coupled a part respectively and carry out power detection, after being converted to the direct current envelope signal, giving control unit 9 through connecting line 8 and analyze.Four tunnel main signals are closed the road and are transmitted to the base station after connecting line 5 is given after amplifier 6 amplifies.
Control unit 9 carries out time domain analysis to four road signals respectively, and the judgement of taking a sample on each business time-slot (channel) of each frequency judges that this time slot (channel) has or not occupied (normally open that keeps up link at the control channel time slot).Traffic Channel is to control in the cycle with a multi-frame.If a multi-frame of Traffic Channel is occupied, then up link is opened in control, keeps the proper communication of up link; If the multi-frame of Traffic Channel is unoccupied, then close up link, do not allow upstream noise introduce the base station base station is produced interference.
Claims (1)
1. one kind reduces the GSM direct end uplink noise method that generation is disturbed to donor base station, it is characterized in that:
A, utilize the frequency-selecting module that the Signal Separation of different frequent points in the repeater equipment up link is come out.Respectively each frequency signal is carried out power detection, output envelope rectified signal, the amplitude of envelope detection signal characterizes the power level of radiofrequency signal;
B, control unit obtain the time slot locating information of each each channel of frequency according to the information of base station broadcast channel, in each channel time slot the envelope detection signal are carried out sample analysis, judge that according to GSM physical layer protocol and rectified signal size each channel has or not occupied;
C, control unit provide control signal according to the occupied information of channel: if time slot has CU, then open the amplifier in the up link or keep up gain constant, guarantee the proper communication of repeater and donor base station; If time slot not by CU, then turn-offs the amplifier in the up link or the up gain that decays, do not allow upstream noise introduce donor base station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100525048A CN101102556A (en) | 2007-06-19 | 2007-06-19 | A method for reducing interference of GSM direct end uplink noise on base station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100525048A CN101102556A (en) | 2007-06-19 | 2007-06-19 | A method for reducing interference of GSM direct end uplink noise on base station |
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| CN101102556A true CN101102556A (en) | 2008-01-09 |
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| CNA2007100525048A Pending CN101102556A (en) | 2007-06-19 | 2007-06-19 | A method for reducing interference of GSM direct end uplink noise on base station |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101594710B (en) * | 2009-07-09 | 2011-09-28 | 上海贝电实业股份有限公司 | Automatic shut-off method for uplink of TD repeater |
| CN101488812B (en) * | 2008-12-23 | 2012-04-25 | 福建先创电子有限公司 | Method and apparatus for eliminating uplink signal noise in GSM digital optical fiber repeater |
| CN101938821B (en) * | 2009-09-29 | 2013-06-05 | 厦门大学 | Method for inhibiting uplink back noise of digital optical fiber repeater |
| CN105871445A (en) * | 2015-01-23 | 2016-08-17 | 中国移动通信集团公司 | Repeater control method and device |
| CN113383526A (en) * | 2018-12-18 | 2021-09-10 | 泰雷兹数字安全德国有限公司 | Method for protecting a communication subscriber from interference attacks |
| CN114900221A (en) * | 2022-07-14 | 2022-08-12 | 深圳国人无线通信有限公司 | Method and system for adaptively adjusting uplink and downlink gains of repeater |
-
2007
- 2007-06-19 CN CNA2007100525048A patent/CN101102556A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101488812B (en) * | 2008-12-23 | 2012-04-25 | 福建先创电子有限公司 | Method and apparatus for eliminating uplink signal noise in GSM digital optical fiber repeater |
| CN101594710B (en) * | 2009-07-09 | 2011-09-28 | 上海贝电实业股份有限公司 | Automatic shut-off method for uplink of TD repeater |
| CN101938821B (en) * | 2009-09-29 | 2013-06-05 | 厦门大学 | Method for inhibiting uplink back noise of digital optical fiber repeater |
| CN105871445A (en) * | 2015-01-23 | 2016-08-17 | 中国移动通信集团公司 | Repeater control method and device |
| CN113383526A (en) * | 2018-12-18 | 2021-09-10 | 泰雷兹数字安全德国有限公司 | Method for protecting a communication subscriber from interference attacks |
| CN113383526B (en) * | 2018-12-18 | 2023-07-07 | 泰利特辛特里恩德国有限公司 | Method for protecting a communication user equipment from interference attacks |
| US11909518B2 (en) | 2018-12-18 | 2024-02-20 | Telit Cinterion Deutschland Gmbh | Method for securing a communication user equipment from a jamming attack |
| CN114900221A (en) * | 2022-07-14 | 2022-08-12 | 深圳国人无线通信有限公司 | Method and system for adaptively adjusting uplink and downlink gains of repeater |
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Open date: 20080109 |