CN101431826A - Cell carrier wave tracing method and system for GSM system - Google Patents
Cell carrier wave tracing method and system for GSM system Download PDFInfo
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- CN101431826A CN101431826A CNA2007100312747A CN200710031274A CN101431826A CN 101431826 A CN101431826 A CN 101431826A CN A2007100312747 A CNA2007100312747 A CN A2007100312747A CN 200710031274 A CN200710031274 A CN 200710031274A CN 101431826 A CN101431826 A CN 101431826A
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Abstract
The present invention discloses a community carrier tracking method applied in GSM system, characterized by including: (1) completing BCCH carrier frequency search and frequency synchronization; (2) locking SCH channel for demodulation, channel decoding and protocol analysis after BCCH carrier frequency obtained, and processing time synchronization with network according to analytical result; (3) locking BCCH channel for demodulation, channel decoding and protocol analysis processing, extracting SI 1 from that to get all ARFCN used in GSM community wherein SI 1 includes channel description and RACH control parameter information in the community. All carrier used in current community can be detected accurately through the invention.
Description
Technical field
The present invention relates to moving communicating field, be specifically related to a kind of cell carrier tracking and system thereof that is applied to gsm system.
Background technology
Owing to the complexity of wireless propagation environment, cover diversity, base station location and coverage limited of landform, in gsm mobile communication system, usually need the repeater to replenish or the covering of extended base station.
The repeater is divided from transmission bandwidth wideband repeater and frequency selecting repeater.All signals that receive reception antenna the wideband repeater amplify; And frequency selecting repeater only amplifies the fixed frequency that is provided with, and filters out the unwanted frequency signal.Because the carrier wave frequency selecting repeater only amplifies the selected carrier wave that gets, so it must know in its residing sub-district to have used which carrier wave actually.
At present the method for the carrier track that adopts is based on and realizes on the basis of carrier energy.By all channel numbers in the GSM frequency range are traveled through, and desire judgement channel and the adjacent channel in the left and right sides carried out power calculation simultaneously.If the energy value of intermediate channels is bigger, both sides smaller and suitable, intermediate channels is exactly an efficient channel so, otherwise think that this channel number is not effective channel number, continue to increase progressively channel number search, the channel number search finishes in frequency range, through repeatedly judging the final channel number of determining.
For prior art, if in a search cycle, because telephone traffic is limited, the carrier wave of this base station does not all use, Search Results that so should the search cycle just can not cover all channel numbers of this base station, therefore need merge processing to the Search Results of a plurality of search cycles.In theory, if the channel number adjustment is not carried out in the base station, so repeatedly Search Results merges the total channel number that the total channel number number in back is less than or equal to opening base station.But when the base station carry out that result that channel number adjusts laggard line search carries out mutually with the result who adjusts the line search that advances or after, the total channel that obtains number number is understood the total channel number greater than present opening base station.Adjust the moment of channel number owing to can't know the base station, therefore in fact still can't accurately know whole carrier waves that the sub-district current time adopts in real time.
Summary of the invention
The objective of the invention is to overcome the shortcoming of prior art, a kind of cell carrier tracking and system thereof that is applied to gsm system is provided, whole carrier waves that the sub-district current time adopts can be accurately known in this invention in real time, improve the intelligent of repeater, reduce the repeater maintenance difficulties.
Purpose of the present invention is achieved through the following technical solutions: a kind of cell carrier tracking that is applied to gsm system may further comprise the steps:
(1) at first finishes the search of BCCH carrier frequency, finish Frequency Synchronization;
(2) then after obtaining the BCCH carrier frequency, locking SCH channel carries out demodulation, channel decoding and protocol analysis to it, carries out time synchronized according to analysis result and network;
(3) lock the BCCH channel at last, it is carried out demodulation, channel decoding and protocol analysis handle, extract SI 1 wherein, thus the whole ARFCN that use in the acquisition GSM sub-district; Described SI 1 comprises the channel of this sub-district to be described and RACH Control Parameter information.
Described step (1) is finished the search of BCCH carrier frequency, finishes Frequency Synchronization, may further comprise the steps:
(a) earlier the RF signal is carried out periodic scan, measures the average signal strength of each frequency, and be tuned on the highest frequency of signal strength signal intensity;
(b) search for the FCCH channel then and judge also whether the frequency of locking is the BCCH carrier frequency, judge again, finally finish Frequency Synchronization if not then be locked to time strong RF signal.
Described step (2) behind locking SCH channel, should be earlier to its finish radio frequency processing, the A/D conversion is transformed into Analog Baseband with signal from radio frequency; Secondly the SCH channel is carried out channel estimating, equilibrium and carries out the GMSK demodulation, finish the Analog Baseband section processes of signal; Again SCH channel digital baseband portion being carried out channel decoding handles; At last the bit stream that obtains after the channel decoding is carried out protocol analysis, carry out time synchronized according to analysis result and network.
Behind described step (3) the locking BCCH channel, should at first finish radio frequency processing, the A/D conversion is transformed into Analog Baseband with signal from radio frequency; Secondly the BCCH channel is carried out channel estimating, equilibrium and carries out the GMSK demodulation, finish the Analog Baseband section processes of signal; Again BCCH channel digital baseband portion being carried out channel decoding handles; At last the bit stream that obtains after the channel decoding is carried out protocol analysis, extract SI1 wherein, thus the whole ARFCN that use in the acquisition GSM sub-district.
Described protocol analysis is to adopt the L3 agreement to carry out protocol analysis, and described L3 is meant the 3rd layer of gsm protocol model.
A kind of system that is applied to the cell carrier method of gsm system comprises the RF processing module, A/D modular converter, channel estimating, equilibrium and GMSK demodulation module, channel decoding module, protocol analysis module and AFC, AGC, frequency/time synchronized module; Described radio-frequency (RF) signal input end is passed through RF processing module, A/D modular converter successively, channel estimating, equilibrium and GMSK demodulation module, and the channel decoding module is connected with the protocol analysis module input; Described channel estimating, equilibrium and GMSK demodulation module, the channel decoding module, the output of protocol analysis module is connected with the input of RF processing module by AFC, AGC, frequency/time synchronized module respectively.
Described channel decoding module comprises FCCH decoding module, SCH decoding module and BCCH decoding module; The input of described FCCH decoding module, SCH decoding module and BCCH decoding module is connected with channel estimating, equilibrium and GMSK demodulation module output respectively; The output of described FCCH decoding module is connected with the input of AFC, AGC, frequency/time synchronized module; The output of described SCH decoding module and BCCH decoding module is connected with the input of protocol analysis module respectively.
Described protocol analysis module comprises SCH parsing module and BCCH parsing module; The input of described SCH parsing module is connected with the output of the SCH decoding module of channel decoding, and output is connected with the input of AFC, AGC, frequency/time synchronized module.
The described cell carrier tracking system that is applied to gsm system also comprises GSM Modem, and described radio-frequency (RF) signal input end is connected with the input of AFC, AGC, frequency/time synchronized module by GSM Modem.
The present invention compared with prior art has following advantage and beneficial effect: the present invention regularly locks the BCCH channel, and it is carried out protocol analysis, obtains the system information of periodic broadcast thereon, accurately knows whole carrier waves that current area adopts.
Description of drawings
Fig. 1 is applied to the cell carrier tracking schematic flow sheet of gsm system for the present invention;
Fig. 2 is the carrier wave tracking system structural representation that a realization is applied to the cell carrier tracking of gsm system;
Fig. 3 is applied to the carrier wave tracking system structural representation of the cell carrier tracking of gsm system for another utilizes GSM Modem realization;
Fig. 4 is applied to the carrier wave tracking system structure of the cell carrier tracking of gsm system for another utilizes the realization of GSM mobile handset chip.
Embodiment
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited thereto.
As shown in Figure 1, the present invention is applied to the cell carrier tracking of gsm system, may further comprise the steps:
(1) at first the RF signal is carried out periodic scan, measures the average signal strength of each frequency, and be tuned on the highest frequency of signal strength signal intensity;
(2) search for the FCCH channel then and judge also whether the frequency of locking is the BCCH carrier frequency, judge again, by that analogy, finally finish Frequency Synchronization if not then be locked to time strong RF signal;
(3) obtained the BCCH carrier frequency after, locking SCH channel carries out demodulation, channel decoding and protocol analysis to it, carries out time synchronized according to analysis result and network;
(4) lock the BCCH channel at last, behind the locking BCCH channel, at first finish operations such as AFC, AGC, A/D conversion signal is transformed into Analog Baseband from radio frequency; Then the BCCH channel is carried out channel estimating, equilibrium and carries out the GMSK demodulation, finish the Analog Baseband section processes of signal; Again the BCCH channel is carried out baseband portion and handle, promptly channel decoding comprises that Burst separates mapping, deinterleaving, convolution code decoding and four steps of Fire sign indicating number decoding; At last the bit stream that obtains after the channel decoding is carried out the L3 protocol analysis, extract SI1 wherein, thus the whole ARFCN that use in the acquisition GSM sub-district.
Embodiment 1
As shown in Figure 2, the carrier wave tracking system that realization is applied to the cell carrier tracking of gsm system comprises: RF processing module, A/D modular converter, channel estimating, equilibrium and GMSK demodulation module, the channel decoding module, protocol analysis module and AFC, AGC, frequency/time synchronized module; Described radio-frequency (RF) signal input end is passed through RF processing module, A/D modular converter successively, channel estimating, equilibrium and GMSK demodulation module, and the channel decoding module is connected with the protocol analysis module input; Described channel estimating, equilibrium and GMSK demodulation module, the channel decoding module, the output of protocol analysis module is connected with the input of RF processing module by AFC, AGC, frequency/time synchronized module respectively.
Described channel decoding module comprises: FCCH decoding module, SCH decoding module and BCCH decoding module; The input of described FCCH decoding module, SCH decoding module and BCCH decoding module is connected with channel estimating, equilibrium and GMSK demodulation module output respectively; The output of described FCCH decoding module is connected with the input of AFC, AGC, frequency/time synchronized module; The output of described SCH decoding module and BCCH decoding module is connected with the input of protocol analysis module respectively.
Described protocol analysis module comprises: SCH parsing module and BCCH parsing module; The input of described SCH parsing module is connected with the output of the SCH decoding module of channel decoding, and output is connected with the input of AFC, AGC, frequency/time synchronized module.
The function that each module is finished in the said system is as follows:
The RF processing module is finished the reception of RF signal, the measurement of average signal strength, the locking of carrier frequency and the locking of channel;
The A/D modular converter is finished all data transformation interfaces between RF/IF and the baseband signal, finishes functions such as I, Q signal collection, digital filtering;
Channel estimating, equilibrium and GMSK demodulation module are finished channel estimating, equilibrium and GMSK demodulation, and the result will act on AFC, AGC, frequency/time synchronized module;
The data of channel decoding module after to demodulation are carried out the channel decoding operation.Here comprise three channel decoding modules of FCCH, SCH and BCCH, wherein the result after the FCCH channel decoding will act on AFC, AGC, frequency/time synchronized module is carried out Frequency Synchronization;
The bit stream of protocol analysis module after to channel decoding carries out the L3 protocol analysis, obtains desired parameters.Here comprise SCH protocol analysis module and BCCH protocol analysis module, wherein the result behind the SCH protocol analysis will act on AFC, AGC, frequency/time synchronized module is carried out time synchronized, and the result behind the BCCH protocol analysis then is the ARFCN in the needed GSM sub-district;
AFC, AGC, frequency/time synchronized module are finished AFC, AGC operation, and will carry out the Frequency Synchronization and the time synchronized of network according to the related feedback information of FCCH and SCH, and act on the RF processing module.
Embodiment 2
As shown in Figure 3, realization is applied among the basic and embodiment 1 of the carrier wave tracking system structure of cell carrier tracking of gsm system similar, and institute's difference is an adjunction GSM Modem between the input of described radio-frequency (RF) signal input end and AFC, AGC, frequency/time synchronized module.In GSM Modem,, the BCCH carrier frequency of current area be can from GSM Modem, obtain like this, the average signal strength measurement of RF signal and the differentiation of BCCH carrier frequency therefore in the RF processing module, need not to carry out by the AT order.
Embodiment 3
As shown in Figure 4, the more easy execution mode that utilizes the GSM mobile handset chip to realize: utilize radio frequency integrated, the GSM mobile handset chip of Analog Baseband, digital baseband, opening by relevant interface, can obtain finishing the bit stream behind the BCCH channel-decoding, and then carry out BCCH channel agreement parse operation, finish the protocol analysis of L3, obtain the ARFCN in the GSM sub-district.
This carrier wave tracking system mainly comprises GSM mobile handset chip and protocol analysis module.Described radiofrequency signal is connected with GSM mobile handset chip input.Described GSM mobile handset chip output is connected with the protocol analysis module input.Described chip for cell phone inside will be finished the location of BCCH carrier frequency automatically; The location of SCH channel, Analog Baseband are handled, digital baseband is handled and protocol analysis; The location of BCCH channel, Analog Baseband are handled, digital baseband is handled.And chip for cell phone output result finishes the L3 protocol analysis by the protocol analysis module, obtains desired parameters, the ARFCN in the promptly needed GSM sub-district.
Described embodiment is a preferred implementation of the present invention; but embodiments of the present invention are not limited by the examples; other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (9)
1, a kind of cell carrier tracking that is applied to gsm system is characterized in that, may further comprise the steps:
(1) at first finishes the search of BCCH carrier frequency, finish Frequency Synchronization;
(2) then after obtaining the BCCH carrier frequency, locking SCH channel carries out demodulation, channel decoding and protocol analysis to it, carries out time synchronized according to analysis result and network;
(3) lock the BCCH channel at last, it is carried out demodulation, channel decoding and protocol analysis handle, extract SI 1 wherein, thus the whole ARFCN that use in the acquisition GSM sub-district; Described SI 1 comprises the channel of this sub-district to be described and RACH Control Parameter information.
2, the cell carrier tracking that is applied to gsm system according to claim 1 is characterized in that, described step (1) is finished the search of BCCH carrier frequency, finishes Frequency Synchronization, may further comprise the steps:
(a) earlier the RF signal is carried out periodic scan, measures the average signal strength of each frequency, and be tuned on the highest frequency of signal strength signal intensity;
(b) search for the FCCH channel then and judge also whether the frequency of locking is the BCCH carrier frequency, judge again, finally finish Frequency Synchronization if not then be locked to time strong RF signal.
3, the cell carrier tracking that is applied to gsm system according to claim 1 is characterized in that, described step (2) behind locking SCH channel, should be earlier to its finish radio frequency processing, the A/D conversion is transformed into Analog Baseband with signal from radio frequency; Secondly the SCH channel is carried out channel estimating, equilibrium and carries out the GMSK demodulation, finish the Analog Baseband section processes of signal; Again SCH channel digital baseband portion being carried out channel decoding handles; At last the bit stream that obtains after the channel decoding is carried out protocol analysis, carry out time synchronized according to analysis result and network.
4, the cell carrier tracking that is applied to gsm system according to claim 1 is characterized in that, behind described step (3) the locking BCCH channel, should at first finish radio frequency processing, the A/D conversion is transformed into Analog Baseband with signal from radio frequency; Secondly the BCCH channel is carried out channel estimating, equilibrium and carries out the GMSK demodulation, finish the Analog Baseband section processes of signal; Again BCCH channel digital baseband portion being carried out channel decoding handles; At last the bit stream that obtains after the channel decoding is carried out protocol analysis, extract SI 1 wherein, thus the whole ARFCN that use in the acquisition GSM sub-district.
According to claim 3 and the described cell carrier tracking that is applied to gsm system of claim 4, it is characterized in that 5, described protocol analysis is to adopt the L3 agreement to carry out protocol analysis, described L3 is meant the 3rd layer of gsm protocol model.
6, realize each described system that is applied to the cell carrier method of gsm system of claim 1～5, it is characterized in that, comprise the RF processing module, the A/D modular converter, channel estimating, equilibrium and GMSK demodulation module, the channel decoding module, protocol analysis module and AFC, AGC, frequency/time synchronized module; Described radio-frequency (RF) signal input end is passed through RF processing module, A/D modular converter successively, channel estimating, equilibrium and GMSK demodulation module, and the channel decoding module is connected with the protocol analysis module input; Described channel estimating, equilibrium and GMSK demodulation module, the channel decoding module, the output of protocol analysis module is connected with the input of RF processing module by AFC, AGC, frequency/time synchronized module respectively.
7, the cell carrier tracking system that is applied to gsm system according to claim 6 is characterized in that, described channel decoding module comprises FCCH decoding module, SCH decoding module and BCCH decoding module; The input of described FCCH decoding module, SCH decoding module and BCCH decoding module is connected with channel estimating, equilibrium and GMSK demodulation module output respectively; The output of described FCCH decoding module is connected with the input of AFC, AGC, frequency/time synchronized module; The output of described SCH decoding module and BCCH decoding module is connected with the input of protocol analysis module respectively.
8, the cell carrier tracking system that is applied to gsm system according to claim 7 is characterized in that, described protocol analysis module comprises SCH parsing module and BCCH parsing module; The input of described SCH parsing module is connected with the output of the SCH decoding module of channel decoding, and output is connected with the input of AFC, AGC, frequency/time synchronized module.
9, the cell carrier tracking system that is applied to gsm system according to claim 6, it is characterized in that, the described cell carrier tracking system that is applied to gsm system also comprises GSM Modem, and described radio-frequency (RF) signal input end is connected with the input of AFC, AGC, frequency/time synchronized module by GSM Modem.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101938448A (en) * | 2010-08-30 | 2011-01-05 | 京信通信系统（中国）有限公司 | CFR (Crest Factor Reduction) processing method and device with automatic carrier tracking function and communication system |
| CN102082597A (en) * | 2010-09-17 | 2011-06-01 | 贾斌 | System and method for carrying out statistics on telephone traffic and drop call rate of GSM (global system for mobile communication) digital repeater |
| CN102545976A (en) * | 2010-12-29 | 2012-07-04 | 深圳国人通信有限公司 | MODEM-based double-channel vehicle-mounted deviation rectification repeater for GSM (Global System for Mobile Communications) |
| CN102625348A (en) * | 2012-03-02 | 2012-08-01 | 京信通信系统（中国）有限公司 | Frequency tracking method and device |
| CN102958201A (en) * | 2011-08-24 | 2013-03-06 | 深圳市云海通讯股份有限公司 | Carrier tracking method based on wireless repeater and wireless repeater |
| CN103595450A (en) * | 2013-03-27 | 2014-02-19 | 深圳国人通信有限公司 | Frequency modulation control method and frequency modulation control system for mobile communication network repeater |
| CN106576283A (en) * | 2014-08-21 | 2017-04-19 | 瑞典爱立信有限公司 | System overload control notifying in extended coverage |
| CN108156106A (en) * | 2017-12-19 | 2018-06-12 | 浙江大学 | Transmission and method for reconstructing suitable for the continuous phase modulated signal of visible light communication |
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2007
- 2007-11-06 CN CNA2007100312747A patent/CN101431826A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101938448A (en) * | 2010-08-30 | 2011-01-05 | 京信通信系统（中国）有限公司 | CFR (Crest Factor Reduction) processing method and device with automatic carrier tracking function and communication system |
| CN101938448B (en) * | 2010-08-30 | 2013-11-06 | 京信通信系统（中国）有限公司 | CFR (Crest Factor Reduction) processing method and device with automatic carrier tracking function and communication system |
| CN102082597A (en) * | 2010-09-17 | 2011-06-01 | 贾斌 | System and method for carrying out statistics on telephone traffic and drop call rate of GSM (global system for mobile communication) digital repeater |
| CN102545976A (en) * | 2010-12-29 | 2012-07-04 | 深圳国人通信有限公司 | MODEM-based double-channel vehicle-mounted deviation rectification repeater for GSM (Global System for Mobile Communications) |
| CN102958201A (en) * | 2011-08-24 | 2013-03-06 | 深圳市云海通讯股份有限公司 | Carrier tracking method based on wireless repeater and wireless repeater |
| CN102958201B (en) * | 2011-08-24 | 2016-04-13 | 深圳市云海通讯股份有限公司 | Based on carrier wave tracing method and the wireless discharging-directly station of wireless discharging-directly station |
| CN102625348A (en) * | 2012-03-02 | 2012-08-01 | 京信通信系统（中国）有限公司 | Frequency tracking method and device |
| CN102625348B (en) * | 2012-03-02 | 2014-12-10 | 京信通信系统（中国）有限公司 | Frequency tracking method and device |
| CN103595450A (en) * | 2013-03-27 | 2014-02-19 | 深圳国人通信有限公司 | Frequency modulation control method and frequency modulation control system for mobile communication network repeater |
| CN106576283A (en) * | 2014-08-21 | 2017-04-19 | 瑞典爱立信有限公司 | System overload control notifying in extended coverage |
| CN108156106A (en) * | 2017-12-19 | 2018-06-12 | 浙江大学 | Transmission and method for reconstructing suitable for the continuous phase modulated signal of visible light communication |
| CN108156106B (en) * | 2017-12-19 | 2020-02-18 | 浙江大学 | Continuous phase modulation signal transmission and reconstruction method suitable for visible light communication |
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