CN1156185C - Channel soft-switching method for global mobile communication system - Google Patents
Channel soft-switching method for global mobile communication system Download PDFInfo
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- CN1156185C CN1156185C CNB011053089A CN01105308A CN1156185C CN 1156185 C CN1156185 C CN 1156185C CN B011053089 A CNB011053089 A CN B011053089A CN 01105308 A CN01105308 A CN 01105308A CN 1156185 C CN1156185 C CN 1156185C
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Abstract
The present invention relates to a soft-switching method for a communication channel of a GSM system. In the method, when BSC judges that the switching of a communication channel needs carrying out from a measurement report reported by an MS from a service district, whether a target district of a common station address has a time slot N of idle TRX the same as a time slot number occupied by the current service district is further judged, if true, then the soft-switching of the communication channel is carried out; the N-th time slot of the idle TRX is activated, and an offset index of a movable frequency set and the movable frequency set completely the same as that of the current TRX communication channel are used; marco diversity combination is completed by EFPU via the current TRX and the idle TRX; if the quality of a communication channel of the idle TRX is superior to that of the communication channel of the current TRX, then the communication channel of the current TRX is released, and the communication channel of the idle TRX is communicated with the MS to report that the switching is completed; if the quality of the communication channel of the idle TRX is inferior to that of the communication channel of the current TRX, then the communication channel of the idle TRX is released, and the communication channel of the current TRX is communicated with the MS to report that the switching fails.
Description
The present invention relates to the method for global system for mobile communications (GSM) channel soft handover.
Switching (Handover) is a very important function of cell mobile communication systems.As means of Radio Link control, the conversation that switching can realize keeping continuous, improve service quality, adjust functions such as cellular cell traffic distribution.In the GSM digital cellular mobile communication systems, the realization of switching relates to travelling carriage (MS), base station controller (BSC), base transceiver station (BTS) and mobile switch functional entitys such as (MSC).The MS and the base transceiver station (BTS) that are in talking state are measured the current wireless link condition jointly, BTS becomes measurement report (MR with the combination of measurements of up link and down link, Measurement Result), and with message send to base station controller (BSC).BSC is according to the measurement result of MR and the actual conditions of combining wireless network, the switching whether decision is switched and carried out what mode this travelling carriage.
Yet in the gsm communication system based on FDMA (frequency division multiple access) and TDMA (time division multiple access), logic channel is the common factor of frequency crack and time slot, and physical channel and logic channel are corresponding one by one on the time slot of frequency crack.MS can only communicate by letter with a logic channel simultaneously, and MS does not have the ability of while and two different channel communications.Therefore in handoff procedure, MS at first will disconnect with the Radio Link of former service cellular cell and being connected, attempt to insert new wireless channel then, in the process of switching, be accompanied by the variation of frequency or time slot, cause communication process that of short duration interruption is arranged, thereby the user feels service quality and descends that this handover procedure of GSM becomes complicated unusually for the switching under the data service simultaneously significantly, even is difficult to realize.
The object of the present invention is to provide a kind of method of the gsm system channel soft handover that can in handoff procedure, improve service quality.
To achieve these goals, in the method for global system for mobile communications channel soft handover provided by the present invention, this global system for mobile communications comprises MS, BSC, BTS and MSC, BTS comprises transceiver (TRX) and baseband processing unit (EFPU), the process of this system channel soft handover is: when BSC judges that according to MS needs generation channel switches from the measurement report that Serving cell reports, further judge whether Target cell exists the time slot N of the identical idle TRX of the timeslot number that takies with current service cell, if exist, then enter the channel soft handoff process: the N time slot that activates this free time TRX, duplicate the frequency sets side-play amount index (MAIO) of adjacent cell, idle TRX channel is used and identical travel frequency set side-play amount index of current TRX channel and travel frequency set (MA), guarantee to have identical frequency crack and time slot between the sub-district; EFPU utilizes current TRX and idle TRX that the baseband portion between the different districts is carried out Coordination Treatment, finishes grand diversity and merges; In an official hour, idle TRX channel and current TRX quality of channel are compared judgement: if idle TRX channel quality conditions is better than current TRX channel, then discharge current TRX channel, only get in touch with idle TRX channel and MS, BTS reports to switch to BSC and finishes, BSC reports to switch to MSC and carries out simultaneously, and BSC discharges current TRX channel resource; If idle TRX channel quality conditions is not better than current TRX channel, then releasing idling TRX channel is only got in touch with current TRX channel and MS, and BTS reports handoff failure to BSC, BSC releasing idling TRX channel resource.
In the method for above-mentioned global system for mobile communications channel soft handover, idle transceiver channel and current transceiver quality of channel are mainly comprised the measurement level of the error rate and up-downgoing.
In the method for above-mentioned global system for mobile communications channel soft handover, a described official hour is meant the time of being determined by agreement.
Adopt the method for above-mentioned gsm communication system channel soft handover, had following advantage:
1) whole handoff procedure is transparent fully to MS
MS does not receive any relevant message of switching, and need not to change the consensus standard of MS yet, therefore MS is not had specific (special) requirements.Help popularizing rapidly of this function like this.
2) any interruption does not take place in service in the whole handoff procedure
From above-mentioned soft switching process, owing to have a wireless links at least between MS and the BTS at any time, therefore in handoff procedure, any interruption does not take place in service, and the user is imperceptible, and switching has taken place.
3) provide switching controls pattern easily for the GSM data service
Do not interrupt owing to communicate by letter in the whole soft switching process, therefore need not intermittently handling packet.
The present invention is further illustrated below in conjunction with embodiment and accompanying drawing.
Fig. 1 is that travelling carriage is from the schematic diagram of Serving cell to the Target cell transition;
Fig. 2 is that travelling carriage is from Serving cell another schematic diagram to the Target cell transition.
The realization of global system for mobile communications channel soft handover of the present invention, based on the basis be: MS must possess the ability of communicating by letter simultaneously with two physical channels.When identical MA set is adopted in all sub-districts, when for example adopting 1 * 1 npt, all sub-districts all have identical frequency crack ability, at this moment, as long as two sub-districts have identical time slot ability, just can form two physical channels with identical frequency crack and time slot, MS can communicate by letter simultaneously with two physical channels, has just possessed the condition that realizes soft handover under the gsm system.
Therefore, actual conditions is as follows:
1) soft handover requires Serving cell and Target cell to have same MA.
2) soft handover can only carry out between synchronized cells, and the baseband portion of different districts need focus on.
3) soft handover can only take place between the identical time slot of different districts.
As shown in Figure 1 and Figure 2, suppose that cellular cell C1, C2 belong to same website, and C1, C2 has identical travelling carriage frequency sets MA (Mobile Allocation).
MS A is in the N time slot of cellular cell C1 transceiver T RX1, and moves to cellular cell C2.
So, MS A is as follows to the process that More Soft Handoff takes place C2 by C1:
1) BSC from the MR that cellular cell C1 reports, judges whether to need to take place More Soft Handoff according to MS A.If desired, enter the judgement of the 2nd step; Otherwise do not do any processing.
2) BSC judges whether cellular cell C2 exists the time slot N of the identical idle transceiver T RX2 of the timeslot number that takies with C1, then enters the operation of the 3rd step if exist; Otherwise do not do any processing.
3) the N time slot of activation TRX2, and use and identical MA of former channel and MAIO, because MAIO distributes unitedly in whole website, the MAIO that therefore duplicates adjacent cell can guarantee that still the frequency crack time slot between Serving cell and the adjacent cell does not clash.
4) baseband processing unit EFPU utilizes 4 receivers and 2 transmitters of TRX1/TRX2 that the baseband portion between the different districts is carried out Coordination Treatment, finishes grand diversity and merges.
5) in agreement stipulated time T, if TRX2 channel quality conditions (the measurement level that comprises the error rate and up-downgoing) is better than the TRX1 channel, then discharge the channel on the TRX1, only get in touch with channel on the TRX2 and mobile phone, BTS reports to switch to BSC and finishes, BSC reports to switch to MSC and carries out, and BSC discharges the channel resource on the TRX1.
6) in agreement stipulated time T, if the TRX2 channel quality conditions is not better than the TRX1 channel, then discharge the channel on the TRX2, only get in touch with channel on the TRX1 and mobile phone, BTS reports handoff failure to BSC, and BSC discharges the channel resource on the TRX2.
Claims (3)
1. the method for a global system for mobile communications channel soft handover is characterized in that, comprises the following steps:
When base station controller judges that according to travelling carriage needs generation channel switches from the measurement report that Serving cell reports, further judge whether Target cell exists the time slot N of the identical idle transceiver of the timeslot number that takies with current service cell, if exist, then enter the channel soft handoff process:
Activate the N time slot of this free time transceiver, duplicate the frequency sets side-play amount index of adjacent cell, idle transceiver channel is used and current transceiver channel identical travelling carriage frequency sets side-play amount index and travelling carriage frequency sets, guarantee to have identical frequency crack and time slot between the sub-district;
Baseband processing unit utilizes current transceiver and idle transceiver that the baseband portion between the different districts is carried out Coordination Treatment, finishes grand diversity and merges;
In an official hour, idle transceiver channel and current transceiver quality of channel are compared judgement:
If idle transceiver channel quality conditions is better than current transceiver channel, then discharge current transceiver channel, only get in touch with idle transceiver channel and travelling carriage, base transceiver station reports to switch to base station controller and finishes, base station controller reports to switch to mobile switch and carries out simultaneously, and base station controller discharges current transceiver channel resource;
If idle transceiver channel quality conditions is not better than current transceiver channel, releasing idling transceiver channel then, only get in touch with current transceiver channel and travelling carriage, base transceiver station reports handoff failure to base station controller, base station controller releasing idling transceiver channel resource.
2. the method for a kind of global system for mobile communications channel soft handover according to claim 1 is characterized in that: the described measurement level that idle transceiver channel and current transceiver quality of channel is mainly comprised the error rate and up-downgoing.
3. the method for a kind of global system for mobile communications channel soft handover according to claim 1 is characterized in that: a described official hour is meant the time of being determined by agreement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011053089A CN1156185C (en) | 2001-02-08 | 2001-02-08 | Channel soft-switching method for global mobile communication system |
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| CNB011053089A CN1156185C (en) | 2001-02-08 | 2001-02-08 | Channel soft-switching method for global mobile communication system |
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| CN1368829A CN1368829A (en) | 2002-09-11 |
| CN1156185C true CN1156185C (en) | 2004-06-30 |
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| CNB011053089A Expired - Fee Related CN1156185C (en) | 2001-02-08 | 2001-02-08 | Channel soft-switching method for global mobile communication system |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100481998C (en) * | 2004-06-01 | 2009-04-22 | Ut斯达康通讯有限公司 | Macrodiversity processing method for supporting soft hand-off technique in the centralized base station |
| CN100502596C (en) * | 2004-10-20 | 2009-06-17 | 厦门特力通科技有限公司 | Intelligent allocating system for mobile communication network resource and method |
| CN100442914C (en) * | 2005-06-30 | 2008-12-10 | 上海华为技术有限公司 | User equipment link management method in soft switch area |
| CN101312575B (en) * | 2007-05-22 | 2011-10-19 | 展讯通信（上海）有限公司 | Method for terminal in TD-SCDMA system to measure GSM neighbor cell |
| CN101340362B (en) * | 2007-08-10 | 2012-02-15 | 华为技术有限公司 | Uploading method, system and entity of channel switching result |
| CN101370301B (en) * | 2008-09-19 | 2011-08-03 | 中国科学技术大学 | Multi-user cooperation transmission data traffic method based on service characteristic |
| CN105025540A (en) * | 2014-04-30 | 2015-11-04 | 中兴通讯股份有限公司 | Method and device for GSM (Global System for Mobile Communication) soft hand-off |
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