CN101557596B - Method for eliminating self-excitation of GSM repeater - Google Patents
Method for eliminating self-excitation of GSM repeater Download PDFInfo
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- CN101557596B CN101557596B CN2009100225146A CN200910022514A CN101557596B CN 101557596 B CN101557596 B CN 101557596B CN 2009100225146 A CN2009100225146 A CN 2009100225146A CN 200910022514 A CN200910022514 A CN 200910022514A CN 101557596 B CN101557596 B CN 101557596B
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Abstract
The invention discloses a method for eliminating the self-excitation of a GSM repeater, which comprises the steps: firstly, a mobile phone agent MSA replaces the original repeater and then is arrangedin a region with blind or weak signals; the mobile phone agent MSA automatically selects a base station, the scope of which is called residential community; in the residential community, a guide comm unity and a service community are built for guiding the mobile phones of the residential community into the service community with different frequency bands; and then the mobile phone agent MSA controls various business flows of the mobile phones entering the service community and leading the work between the mobile phone agent and the residential community, and between the mobile phone agent and the mobile phones at different frequency points on the condition of finishing the business of mobile phones, thereby achieving the purposes of signal amplification, blind area elimination and the likewithin the covering scope of the mobile phone agent MSA.
Description
Technical field
The present invention relates to the self-excitation eliminating method of a kind of gsm wireless repeater.
Background technology
GSM (Global System for Mobile Communication), promptly global system for mobile communications is a second generation cellular digital mobile communication system, it is to develop according to the GSM standard that European Telecommunication Standard Institute formulates.The characteristics such as interface that gsm system has spectrum efficiency height, networking flexibility, capacity is big, fail safe is better, antijamming capability is strong, system communication quality is higher, open.Gsm system adopts 900MHZ, 1800MHZ and 1900MHZ frequency range, adjacent two channel spacing 200KHZ, and each channel adopts time division multiple access way, is divided into 8 channels.It adopts the mode of channeling, and multiplexing identical carrier frequency covers on different geographic areas, and efficient is higher.The business that gsm system provides has telecommunication service, bearer service, supplementary service and intelligent network business.Wherein telecommunication service comprises voice service again, data service and short message service etc.
The repeater is a kind of radio transmission transferring equipment that plays the signal humidification in the wireless communication transmissions process.It is for the signal blind zone among a small circle of eliminating mobile radio communication or weak signal area and design production, be widely used in the parking lot, the signal blind zone that base station signals such as skyscraper can't arrive simultaneously also has goodish coverage effect for eliminating the city because of the outdoor local signal shadow region that influenced by high buildings and large mansions to produce and the weak signal area in outlying suburb.There are GSM repeater, CDMA repeater and 3G repeater in the repeater from the transmission signals branch, in order to support different mobile communication system; From the transmission means branch wireless discharging-directly station and optical fiber repeater are arranged, wireless discharging-directly station divides wireless intra-frequency repeater and wireless frequency-shift repeater again.
Wireless intra-frequency repeater principle such as Fig. 1.Its course of work is: the downstream signal that is sent by the base station receives through donor antenna, by duplexer, arrive low noise amplifier (LNA), again through band pass filter, power amplifier (power amplifier), after signal power reaches launch requirements, be transmitted into the area of coverage by duplexer and retransmitting antenna.The upward signal that MS sent out is received by retransmitting antenna, behind duplexer, LNA, power amplifier, duplexer, is transmitted to the base station from donor antenna.Because wireless intra-frequency repeater donor antenna and forwarding antenna have adopted same frequency, the back lobe that part signal is coupled to donor antenna through the back lobe of forwarding antenna again, amplified by the repeater, wireless like this intra-frequency repeater causes self-excitation with regard to forming a potential regenerative feedback loop again.Also having a kind of is exactly inner generation self-excitation in the repeater, because the bad self-excitation that causes of shielding between the internal module of repeater, principle is with outside self-excitation.Power amplifier module, LNA module can be pushed away behind the straight-forward station self-excitation saturated, the index of module can worsen rapidly, influence the interior conversation of repeater and base station coverage area.In addition, to get rid of difficulty and can impact the base station also be the shortcoming of this type of repeater technology for wireless intra-frequency repeater Installation and Debugging difficulty, self-excitation fault.
Wireless frequency-shift repeater principle such as Fig. 2, for the base station down link, after system receives the downstream signal of base station by the proximal device donor antenna, via cavity body filter, after entering transceiving integrated module low noise and amplifying end (LNA) and farthest suppress noise and amplify, arrive required frequency via shift frequency module shift frequency again, enter the processing such as control, power collecting of amplifying, decay of transceiving integrated module power amplifier end then, launch by retransmitting antenna by the cavity body filter of retransmitting end at last.Receive by the descending frequency-shift signaling after the proximal device frequency conversion at system's remote equipment donor antenna, via cavity body filter, after entering transceiving integrated module low noise and amplifying end and farthest suppress noise and amplify, cover both working channels of signal frequency to this zone via shift frequency module shift frequency again, enter the processing such as control, power collecting of amplifying, decay of transceiving integrated module power amplifier end then, launch by retransmitting antenna by the cavity body filter of retransmitting end at last, carry out signal and cover.For upward signal, processing procedure and descending basic identical.The benefit of doing like this is, no matter is proximal device or remote equipment, their acceptance separately with transmit differently, reduced requirement, thereby made that the frequency-shift repeater application conditions is lower isolation, range of application is wider.But frequency-shift repeater can impact the base station, and the Installation and Debugging difficulty, has the shortcoming of self-excitation.For the product of indoor application,, often between proximal device and remote equipment, dispose coaxial cable or reveal cable in addition, need calculating propagation loss and cost higher in order to reach effect preferably
Summary of the invention
The removing method that the purpose of this invention is to provide a kind of GSM straight-forward station self-excitation, by mobile phone agency (MSA) the base station end that receives and the signaling of mobile phone end are analyzed, set up one to the transparent new sub-district of peripheral base station, provide service by this sub-district for the mobile phone in its coverage, thereby make the repeater different with the transmitting terminal signal frequency point in reception, fundamentally eliminate self-excitation, can overcome the deficiency in the existing program.
For reaching above purpose, the present invention takes following technical scheme to be achieved:
A kind of method of eliminating the gsm wireless straight-forward station self-excitation, it is characterized in that: at first, act on behalf of MSA by a mobile phone and replace original repeater, this mobile phone is acted on behalf of MSA and is comprised a high-rise processing module based on signalling analysis and modification, this high level processing module is connected with a physical layer process module two-way signaling based on modulating and demodulating signal and channel coding/decoding, and physical layer process module both sides connect donor antenna and cover antenna respectively by radio frequency and AD/DA module;
Then described mobile phone is acted on behalf of MSA and be arranged on zone a little less than signal blind zone or the signal, this mobile phone is acted on behalf of MSA and is selected a base station automatically, this base station scope is called persistent district, newly-built guiding sub-district and Serving cell realize that the cell phone guiding that will be in persistent district enters the Serving cell of alien frequencies section in persistent district, so that the business of cell phone is handled;
Then mobile phone is acted on behalf of MSA the miscellaneous service flow process that enters the Serving cell cell phone is controlled, under the prerequisite of finishing the cell phone business, make between mobile phone agency and the persistent district, be operated in different frequencies between mobile phone agency and the cell phone, thereby realize that mobile phone acts on behalf of purposes such as signal amplification in the MSA coverage, dead zone-eliminating.
In the such scheme, the selection of described persistent district, comprise that the foundation and the Business Processing of guiding sub-district and Serving cell may further comprise the steps:
Step 2 is analyzed cell system message; Initiate gravity treatment and select condition up to discontented lumping weight, selecting the sub-district of this moment is persistent district;
Step 3 is initiated the frequency level measurement, and all frequencies in the gsm protocol are measured level; Monitor the persistent district broadcast channel message, according to corresponding relation, selecting a cover frequency is that Serving cell uses;
Step 4 is monitored the persistent district broadcast, is revised as the broadcast that is fit to new Serving cell; Set up Serving cell, on the broadcasting frequency that step 3 is selected, send new cell broadcast messages;
Step 5 is revised the persistent district broadcast, and the cell broadcast service frequency is added in the broadcast, sends new broadcast on the broadcasting frequency of persistent district, sets up the guiding sub-district, covers original persistent district signal;
Step 6, mobile phone is acted on behalf of MSA transmitting signaling and message between the correlated channels of persistent district and Serving cell, and revise broadcast channel BCCH, allow to comprise among access channel AGCH and the Separate Dedicated Control Channel SDCCH signaling of frequency point allocation, as the Assignment Command immediately among the AGCH, Assignment Command and the system message among the BCCH 1 among the SDCCH; Communicate by letter with the base station end, employing be the frequency of persistent district, communicate by letter with the mobile phone end, employing be the frequency of Serving cell;
Step 7, mobile phone are acted on behalf of the mode of MSA according to mobile phone gravity treatment base station, in the free time that service is not provided for mobile phone, initiate gravity treatment, and reselect persistent district, set up Serving cell and guiding sub-district.
In the step 1, described be synchronized to one broadcasting frequency, comprise following two kinds of situations:
(1) mobile phone is acted on behalf of MSA and is checked self whether to store broadcast channel BCCH frequency point information, store and can be connected on this frequency if having, the frequency that comprises that obtains is wherein tabulated, adjacent cell list, and the system message of information such as reselecting parameters is to be used for a newly-built Serving cell and guiding sub-district;
(2) mobile phone is acted on behalf of the MSA inspection and self is not preserved any frequency point information, perhaps there is storage still can not be connected to this frequency, then according to gsm protocol, mobile phone is acted on behalf of MSA full frequency band (900 frequency ranges and 1800 frequency ranges) is searched for, according to incoming level frequency is sorted, select a broadcasting frequency that can connect from big to small by level.
In the step 3, the frequency of described needs search level and the frequency of persistent district belong to the frequency of different series, as the persistent district of GSM900, then search for the frequency of GSM1800.
In the step 4, the described broadcast that sends in Serving cell is to obtain by the modification to the persistent district broadcast, mainly is to have added the information that comprises the new frequency of Serving cell and influence gravity treatment, comprises following content:
(1) after MSA receives the system message 1 of persistent district, revises the frequency point information of Serving cell in the cell channel description unit wherein, generate new system message 1, send in the corresponding moment of cell broadcast service control channel then;
(2) in the single-frequency gsm system, after MSA receives the system message 2 of persistent district, the adjacent sub-district description unit of revising wherein is and the adjacent subdistrict frequency point information of Serving cell in identical frequency band, generates new system message 2, sends in the corresponding moment of cell broadcast service control channel then; In the double frequency gsm system, MSA generates new system message 2 according to adjacent subdistrict frequency point information among the persistent district system message 2ter, sends in the corresponding moment of cell broadcast service control channel then;
(3) in the single-frequency gsm system, MSA sets up new system message 2ter according to the adjacent subdistrict frequency point information in the persistent district system message 2, sends in the corresponding moment of cell broadcast service control channel then; In the double frequency gsm system, after MSA received persistent district system message 2ter, the adjacent subdistrict frequency point information according in the persistent district system message 2 generated new system message 2ter, sends in the corresponding moment of cell broadcast service control channel then;
(4) after MSA receives persistent district system message 3, revise the relevant information of cell identification unit wherein and cell selecting parameter unit, generate new system message 3, send in the corresponding moment of cell broadcast service control channel then; For the single-frequency gsm system, also to revise the 2ter indicating bit;
(5) after MSA receives persistent district system message 4, revise the wherein relevant information of cell selecting parameter unit, generate new system message 4, send in the corresponding moment of cell broadcast service control channel then; For the system that supports Cell Broadcast Short Message CBCH, also to revise the CBCH description unit;
(6) for system message 7 and 8, the modification of frame of reference message 4 remaining bits, other system message is not revised, and directly sends in the corresponding moment of cell broadcast service control channel.
In the step 5, the described broadcast that sends in the guiding sub-district is to obtain by the modification to the persistent district broadcast, comprises following content:
(1) for the single-frequency gsm system, MSA generates a system message 2ter who comprises the cell broadcast service frequency, sends in the corresponding moment of persistent district Broadcast Control Channel then; Need to revise persistent district system message 3 simultaneously, generate new system message 3 and send in the corresponding moment of persistent district Broadcast Control Channel.
(2) for the double frequency gsm system, MSA receives the system message 2ter of persistent district, adds the cell broadcast service frequency point information therein, generates new system message 2ter, sends in the corresponding moment of persistent district Broadcast Control Channel then.
In the step 6, described processing mode to channel is specific as follows:
(1) MSA monitors the PCH of persistent district, and paging receiving message is transmitted this beep-page message then on the PCH of Serving cell;
(2) RACH of MSA monitoring service sub-district, the receive channel request message is transmitted on the RACH of persistent district then, simultaneously MSA record random access code wherein;
(3) MSA monitors the AGCH of persistent district, filters out the immediate assignment order of the MS in the respond services sub-district; The immediate assignment order is revised, and on the AGCH of Serving cell, transmitted;
(4) MSA judges whether the channel allocation success on the channel that MS may connect, if success is monitored the descender of current channel, after receiving the appointment order, revises, and sends at next multi-frame;
(5) signal on MSA the Traffic Channel TCH that MS is connected is just done the conversion of a frequency therein, and whether channel is still in use, to determine whether to discharge this channel by electrical level judging by bottom.
(6) MSA mainly is that system message 5 and system message 5ter are made amendment to descending SACCH, and MSA revises measurement report to the signal demand among the up SACCH.
The travelling carriage service broker who realizes according to the inventive method has that signal is good, index is high, volume is little, install and simple and easyly can not produce dysgenic characteristics to base station and mobile phone.
Description of drawings
Fig. 1 is existing wireless intra-frequency repeater structure principle chart.
Fig. 2 is existing wireless frequency-shift repeater structure principle chart.
Fig. 3 the present invention is based on the wireless system schematic diagram that mobile phone is acted on behalf of MSA.
Fig. 4 acts on behalf of the MSA structure principle chart for mobile phone of the present invention.
Fig. 5 acts on behalf of MSA for mobile phone of the present invention and selects the persistent district flow chart.
Embodiment
The present invention is described in further detail below in conjunction with drawings and Examples.
With reference to figure 3, a little less than signal blind zone or signal, after the zone, can select a base station automatically according to the deployed with devices that the present invention program realizes, this base station scope is called persistent district, and sets up two sub-districts according to this base station information, guiding sub-district and Serving cell.The guiding sub-district has only a broadcasting frequency, and identical with the persistent district frequency, and effect is to cover more weak persistent district signal, and the cellphone subscriber of entry range can be connected to this frequency and receive the system broadcast message that comprises the Serving cell frequency point information.Serving cell is the sub-district that mobile phone connects when finally can carry out business, the signal of this sub-district is sent to the base station by the frequency frequency that the MSA frequency conversion becomes persistent district, and the response of base station is also sent to the cellphone subscriber by the frequency frequency that the MSA frequency conversion becomes Serving cell.After deployed with devices, mobile phone enters after the MSA scope, at first received the system message of the guiding sub-district of MSA broadcasting, mobile phone is found the frequency of Serving cell by this system message and is connected, these are transparent to the persistent district base station, therefore, when mobile phone began business, what MSA played was the translation function of persistent district frequency signal and service subdistrict frequency point signal.
With reference to figure 4, mobile phone of the present invention is acted on behalf of among the MSA, and high-rise processing module comprises signalling analysis and modification etc., and its main task is a channel of knowing base station and mobile communication according to the signalling analysis result, and revise signaling in view of the above and send to mobile phone or base station, reach the purpose of revising communication channel.The physical layer process module comprises the modulation, channel coding/decoding of channel synchronization, signal and to control of AD/DA etc.Radio frequency and AD/DA module are in order radiofrequency signal to be converted to baseband signal or baseband signal to be upconverted to radio frequency.The realization of can programming in DSP and FPGA of high-rise processing module and physical layer process module, algorithm is with reference to general algorithm in gsm communication agreement and the mobile phone physical layer.
In addition, consider the power system capacity problem, radio frequency needs a plurality of passages to communicate by letter simultaneously to support many mobile phones with the AD/DA module with between the physical layer process module.These passages can be disposed by physical layer process module and the unification of high-rise processing module, scheduling, to reach its intended purposes.
With reference to figure 5, the present invention selects the persistent district method specific as follows:
The first step, MSA checks self whether to store broadcast channel BCCH carrier frequency information, stores and can be connected on this carrier frequency if having, and then goes to for the 5th step; If storage or connection be not less than on this carrier frequency, went to for second step;
In second step, MSA searches for full frequency band (900 frequency ranges and 1800 frequency ranges), according to incoming level frequency is sorted;
The 3rd step, judge whether the carrier frequency of maximum level is the BCCH carrier frequency, if went to for the 4th step, if not, in the residue frequency, continued to carry out the 3rd step;
The 4th step, synchronous this BCCH carrier frequency, read the system message of this sub-district, check whether this sub-district allows to insert, and according to the minimum incoming level (RXLEV_ACCESS_MIN) that is included in the travelling carriage permission access in the system message, path loss principle parameters C 1 value of control channel maximal power level this sub-districts of calculation of parameter such as (MS_TXPWR_MAX_CCH), if should be worth greater than 0, MSA inserts this sub-district, goes to for the 5th step; If be not more than 0, went to for the 3rd step;
The 5th step, read the adjacent subdistrict frequency point that inserts in the cell system message, monitor adjacent CBCH according to adjacent subdistrict frequency point, and allow the minimum incoming level (RXLEV_ACCESS_MIN) of access according to the travelling carriage in the system message, control channel maximal power level (MS_TXPWR_MAX_CCH), cell reselection offset (CELL_RESELECT_OFFSET), interim skew (TEMPORARY_OFFSET), the path loss principle parameters C 1 and the sub-district gravity treatment channel quality canonical parameter C2 value of make-up time this sub-districts of calculation of parameter such as (PENALTY_TIME) and adjacent sub-district;
In the 6th step, if C1 and C2 value satisfy reselection conditions, the MSA gravity treatment is to adjacent sub-district; If discontented lumping weight selects condition, MSA continues to remain in the former sub-district.
Through top step, MSA has inserted a sub-district, is provided with a timer among the present invention, resets when gravity treatment takes place MSA.If after timer expired, MSA still rests on certain sub-district, and system just thinks that this sub-district is that this start of MSA is with the persistent district that inserts.
With the persistent district is the 900M sub-district, and Serving cell is an example for the 1800M sub-district, introduces the process of the newly-built sub-district of MSA.
A newly-built Serving cell, detailed process is as follows:
1) after MSA received the system message 1 of persistent district, the CA table of revising in the cell channel description unit wherein was the frequency point information of Serving cell to generate new system message 1, sends in the corresponding moment of cell broadcast service control channel then;
2) in the single-frequency gsm system, after MSA receives the system message 2 of persistent district, the BA table of revising in the description unit of wherein adjacent sub-district is and the adjacent subdistrict frequency point information of Serving cell in identical frequency band, generate new system message 2, send in the corresponding moment of cell broadcast service control channel then; In the double frequency gsm system, MSA revises above-mentioned BA table according to adjacent subdistrict frequency point information among the persistent district system message 2ter, generates new system message 2, sends in the corresponding moment of cell broadcast service control channel then;
3) in the single-frequency gsm system, MSA sets up new system message 2ter according to the adjacent subdistrict frequency point information in the persistent district system message 2, sends in the corresponding moment of cell broadcast service control channel then; In the double frequency gsm system, after MSA receives persistent district system message 2ter, according to the adjacent subdistrict frequency point information in the persistent district system message 2, revise the BA table in the description unit of wherein adjacent sub-district, generate new system message 2ter, send in the corresponding moment of cell broadcast service control channel then;
4) after MSA receives persistent district system message 3, revise the relevant information of cell identification unit wherein and cell selecting parameter unit, generate new system message 3, send in the corresponding moment of cell broadcast service control channel then.For the single-frequency gsm system, also to revise the 2ter indicating bit;
5) after MSA receives persistent district system message 4, revise the wherein relevant information of cell selecting parameter unit, generate new system message 4, send in the corresponding moment of cell broadcast service control channel then.For the system that supports Cell Broadcast Short Message CBCH, also to revise the CBCH description unit;
6) for system message 7 and 8, the modification of frame of reference message 4 remaining bits, other system message is not revised, and directly sends in the corresponding moment of cell broadcast service control channel.
The process of the setting up detailed process of guiding sub-district is described below:
1) for the single-frequency gsm system, MSA generates a system message 2ter who comprises the cell broadcast service frequency, sends in the corresponding moment of persistent district Broadcast Control Channel then; Need to revise the 2ter indicating bit in the persistent district system message 3 simultaneously, generate new system message 3 and send in the corresponding moment of persistent district Broadcast Control Channel;
2) for the double frequency gsm system, MSA receives the system message 2ter of persistent district, add the cell broadcast service frequency point information in the description unit of adjacent therein sub-district, generate new system message 2ter, send in the corresponding moment of persistent district Broadcast Control Channel then.
In order to support the related service of mobile phone, the inventive method need be between the correlated channels of persistent district and Serving cell transmitting signaling and message, and some signaling in the particular channel handled.Concrete processing method is as follows:
1) MSA monitors the paging channel PCH of persistent district, and paging receiving message is transmitted this beep-page message then on the PCH of Serving cell;
2) the Random Access Channel RACH of MSA monitoring service sub-district, the receive channel request message is transmitted on the RACH of persistent district then, and MSA demodulation, decoding, decapsulation channel request message write down random access code wherein simultaneously.
3) MSA monitors the AGCH of persistent district, receives message, and demodulation, decoding, decapsulation, therefrom identifies immediate assignment message; Contrast the random access code of channel request before then, filter out the immediate assignment order of the MS in the respond services sub-district; Check the chirp parameter of channel description unit in the message afterwards.If frequency hopping then encapsulates, encodes, modulates immediate assignment message, and transmits on the AGCH of Serving cell.If untuned, the absolute frequency number of then revising channel description unit in the message is a certain frequency in the Serving cell, for the MS of request channel distributes a new SDCCH channel in Serving cell, after encapsulation, coding, modulation, on the AGCH of Serving cell, transmit then.What MSA monitored base transceiver station BTS on the channel that MS may connect replys the UA frame, information such as the frequency time slot of channel according to before information in the immediate assignment order that issues draw.In official hour, (this time is identical with the T3101 of BTS) then stops to monitor and discharging channel if do not receive any UA frame.If receive the UA frame, think that then MS has inserted this SDCCH channel, descender to current channel is monitored, demodulation, decoding, decapsulation according to the difference of calling and called, therefrom identify the sign signaling, continue to monitor down channel and begin the delayed delivery downlink signaling, when receive assign order after, revising relevant informations such as the frequency that comprises voice channel and frequency-hopping mode is current service cell service frequency, sends at next multi-frame.
4) signal on MSA the Traffic Channel TCH that MS is connected is not done operations such as demodulation, decoding, just send from the frequency that the frequency of persistent district is transformed into Serving cell for the downstream signal that receives, otherwise for upward signal; Only whether channel is still using, to determine whether to discharge this channel by electrical level judging by bottom.
5) MSA mainly is that system message 5 and system message 5ter are made amendment to descending SACCH, and the content of the adjacent subdistrict frequency point of two class message is exchanged to meet the actual conditions of Serving cell.For example, utilize the 900M persistent district to set up in the 1800M Serving cell process, generate new system message 5ter and in the SACCH of Serving cell, send about go on record form according to GSM1800 of the information of GSM900 in the adjacent sub-district in the system message 5 in the former 900M sub-district.MSA also needs to revise to the signal among the up SACCH, and the BCCH-IND that revises the measurement report the inside that receives is the frequency sequence number of persistent district system message, sends to the base station afterwards on the SACCH of persistent district channel.So just can guarantee that after mobile phone left MSA, correct switching can be initiated according to measurement report in the base station.
Claims (7)
1. method of eliminating the gsm wireless straight-forward station self-excitation, it is characterized in that: at first, act on behalf of MSA by a mobile phone and replace original repeater, this mobile phone is acted on behalf of MSA and is comprised a high-rise processing module based on signalling analysis and modification, this high level processing module is connected with a physical layer process module two-way signaling based on modulating and demodulating signal and channel coding/decoding, and physical layer process module both sides connect donor antenna and cover antenna respectively by radio frequency and AD/DA module;
Then described mobile phone is acted on behalf of MSA and be arranged on zone a little less than signal blind zone or the signal, this mobile phone is acted on behalf of MSA and is selected a base station automatically, this base station scope is called persistent district, newly-built guiding sub-district and Serving cell realize that the cell phone guiding that will be in persistent district enters the Serving cell of alien frequencies section in persistent district, so that the business of cell phone is handled;
Then mobile phone is acted on behalf of MSA the miscellaneous service flow process that enters the Serving cell cell phone is controlled, under the prerequisite of finishing the cell phone business, make between mobile phone agency and the persistent district, be operated in different frequencies between mobile phone agency and the cell phone, thereby realize that mobile phone acts on behalf of that signal amplifies in the MSA coverage, the dead zone-eliminating purpose.
2. the method for elimination gsm wireless straight-forward station self-excitation as claimed in claim 1 is characterized in that: the selection of described persistent district, comprise that the foundation and the Business Processing of guiding sub-district and Serving cell may further comprise the steps:
Step 1, mobile phone are acted on behalf of the MSA start, are synchronized to a broadcasting frequency, and the broadcasting frequency that this broadcasting frequency is preserved before can being also can be a broadcasting frequency that level is the highest that obtains by search;
Step 2 is analyzed cell system message; Initiate gravity treatment and select condition up to discontented lumping weight, selecting the sub-district of this moment is persistent district;
Step 3 is initiated the frequency level measurement, and all frequencies in the gsm protocol are measured level; Monitor the persistent district broadcast channel message, according to corresponding relation, selecting a cover frequency is that Serving cell uses;
Step 4 is monitored the persistent district broadcast, is revised as the broadcast that is fit to new Serving cell; Set up Serving cell, on the broadcasting frequency that step 3 is selected, send new cell broadcast messages;
Step 5 is revised the persistent district broadcast, and the cell broadcast service frequency is added in the broadcast, sends new broadcast on the broadcasting frequency of persistent district, sets up the guiding sub-district, covers original persistent district signal;
Step 6, mobile phone is acted on behalf of MSA transmitting signaling and message between the correlated channels of persistent district and Serving cell, and revise the signaling that comprises frequency point allocation in broadcast channel, permission access channel and the Separate Dedicated Control Channel, comprise Assignment Command, Assignment Command and system message 1 immediately; Communicate by letter with the base station end, employing be the frequency of persistent district, communicate by letter with the mobile phone end, employing be the frequency of Serving cell;
Step 7, mobile phone are acted on behalf of the mode of MSA according to mobile phone gravity treatment base station, in the free time that service is not provided for mobile phone, initiate gravity treatment, and reselect persistent district, set up Serving cell and guiding sub-district.
3. the method for elimination gsm wireless straight-forward station self-excitation as claimed in claim 2 is characterized in that: in the step 1, described be synchronized to one broadcasting frequency, comprise following two kinds of situations:
(1) mobile phone is acted on behalf of MSA and is checked self whether to store broadcast channel BCCH frequency point information, if storage is arranged and can be connected on this frequency, obtains wherein system message to be used for a newly-built Serving cell and guiding sub-district;
(2) mobile phone is acted on behalf of the MSA inspection and self is not preserved any frequency point information, perhaps there is storage still can not be connected to this frequency, then according to gsm protocol, mobile phone is acted on behalf of MSA full frequency band is searched for, according to incoming level frequency is sorted, select a broadcasting frequency that can connect from big to small by level.
4. the method for elimination gsm wireless straight-forward station self-excitation as claimed in claim 2, it is characterized in that: in the step 3, the frequency of described needs measurement level and the frequency of persistent district belong to the frequency of different series, as the persistent district of GSM900, then search for the frequency of GSM1800.
5. the method for elimination gsm wireless straight-forward station self-excitation as claimed in claim 2, it is characterized in that: in the step 4, the described broadcast that sends in Serving cell is to obtain by the modification to the persistent district broadcast, mainly be to have added the information that comprises the new frequency of Serving cell and influence gravity treatment, comprise following content:
(1) after MSA receives the system message 1 of persistent district, revises the frequency point information of Serving cell in the cell channel description unit wherein, generate new system message 1, send in the corresponding moment of cell broadcast service control channel then;
(2) in the single-frequency gsm system, after MSA receives the system message 2 of persistent district, the adjacent sub-district description unit of revising wherein is and the adjacent subdistrict frequency point information of Serving cell in identical frequency band, generates new system message 2, sends in the corresponding moment of cell broadcast service control channel then; In the double frequency gsm system, MSA generates new system message 2 according to adjacent subdistrict frequency point information among the persistent district system message 2ter, sends in the corresponding moment of cell broadcast service control channel then;
(3) in the single-frequency gsm system, MSA sets up new system message 2ter according to the adjacent subdistrict frequency point information in the persistent district system message 2, sends in the corresponding moment of cell broadcast service control channel then; In the double frequency gsm system, after MSA received persistent district system message 2ter, the adjacent subdistrict frequency point information according in the persistent district system message 2 generated new system message 2ter, sends in the corresponding moment of cell broadcast service control channel then;
(4) after MSA receives persistent district system message 3, revise the relevant information of cell identification unit wherein and cell selecting parameter unit, generate new system message 3, send in the corresponding moment of cell broadcast service control channel then; For the single-frequency gsm system, also to revise the 2ter indicating bit;
(5) after MSA receives persistent district system message 4, revise the wherein relevant information of cell selecting parameter unit, generate new system message 4, send in the corresponding moment of cell broadcast service control channel then; For the system that supports Cell Broadcast Short Message CBCH, also to revise the CBCH description unit;
(6) for system message 7 and 8, the modification of frame of reference message 4 remaining bits, other system message is not revised, and directly sends in the corresponding moment of cell broadcast service control channel.
6. the method for elimination gsm wireless straight-forward station self-excitation as claimed in claim 2, it is characterized in that: in the step 5, described modification persistent district broadcast, the cell broadcast service frequency is added in the broadcast, on the broadcasting frequency of persistent district, send new broadcast, set up the guiding sub-district, cover original persistent district signal, comprise following content:
(1) for the single-frequency gsm system, MSA generates a system message 2ter who comprises the cell broadcast service frequency, sends in the corresponding moment of persistent district Broadcast Control Channel then; Need to revise persistent district system message 3 simultaneously, generate new system message 3 and send in the corresponding moment of persistent district Broadcast Control Channel;
(2) for the double frequency gsm system, MSA receives the system message 2ter of persistent district, adds the cell broadcast service frequency point information therein, generates new system message 2ter, sends in the corresponding moment of persistent district Broadcast Control Channel then.
7. the method for elimination gsm wireless straight-forward station self-excitation as claimed in claim 2 is characterized in that: in the step 6, described processing mode to channel is specific as follows:
(1) MSA monitors the paging channel PCH of persistent district, and paging receiving message is transmitted this beep-page message then on the PCH of Serving cell;
(2) the Random Access Channel RACH of MSA monitoring service sub-district, the receive channel request message is transmitted on the RACH of persistent district then, simultaneously MSA record random access code wherein;
(3) MSA monitors the permission access channel AGCH of persistent district, filters out the Assignment Command immediately of the MS in the respond services sub-district; To Assignment Command modification immediately, and on the AGCH of Serving cell, transmit;
(4) MSA judges whether the channel allocation success on the channel that MS may connect, if success, descender to current channel is monitored, after receiving Assignment Command, frequency and frequency-hopping mode relevant information that modification comprises voice channel are current service cell service frequency, send at next multi-frame;
(5) signal on MSA the Traffic Channel TCH that MS is connected is just done the conversion of a frequency therein, and whether channel is still in use, to determine whether to discharge this channel by electrical level judging by bottom;
(6) MSA mainly is that system message 5 and system message 5ter are made amendment to descending slow associated control channel SACCH, and MSA revises measurement report to the signal demand among the up SACCH.
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| CN2009100225146A CN101557596B (en) | 2009-05-14 | 2009-05-14 | Method for eliminating self-excitation of GSM repeater |
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| CN2009100225146A CN101557596B (en) | 2009-05-14 | 2009-05-14 | Method for eliminating self-excitation of GSM repeater |
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| CN101754480B (en) * | 2010-02-03 | 2012-02-01 | 西安交通大学 | Global system for mobile communication (GSM) repeater and self-adaption interference cancellation method thereof |
| US9807633B2 (en) * | 2010-11-05 | 2017-10-31 | Google Technology Holdings LLC | Configuring unscheduled periods to enable interference reduction in heterogeneous networks |
| CN107659352B (en) * | 2016-07-25 | 2020-06-12 | 展讯通信（上海）有限公司 | Self-excitation detection and processing method and device of micro repeater and baseband chip |
| CN106792768A (en) * | 2016-12-23 | 2017-05-31 | 广西英伦信息技术股份有限公司 | A kind of system and method for strengthening indoor signal coverage strength |
| CN114978272A (en) * | 2022-04-29 | 2022-08-30 | 深圳市可信华成通信科技有限公司 | Multi-band digital repeater |
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