CN1330502A - Soft switching method for CDNA system - Google Patents
Soft switching method for CDNA system Download PDFInfo
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Abstract
本发明公开了一种CDMA系统的软切换方法,它适用于目前的码分多址系统中,其特征在于该系统是通过引入通信质量指示参数与移动台所测量到的导频信号强度的变化来共同作用启动激活软切换过程,同时,移动台根据通信质量指示对启动、结束软切换的门限值进行动态调整,不仅改善了软切换技术的性能,减少了通话的掉话率,提高了越区切换时的通信质量,主要是能使系统尽快释放资源,更大程度地提高系统容量。
The invention discloses a soft handover method of a CDMA system, which is suitable for the current code division multiple access system, and is characterized in that the system is implemented by introducing the communication quality indicator parameter and the change of the pilot signal strength measured by the mobile station The combined effect starts and activates the soft handover process, and at the same time, the mobile station dynamically adjusts the threshold value for starting and ending the soft handover according to the communication quality indication, which not only improves the performance of the soft handover technology, reduces the call drop rate, and improves the The quality of communication during zone switching is mainly to enable the system to release resources as soon as possible and improve the system capacity to a greater extent.
Description
The present invention relates to code division multiple access (Code Division Multiple Access, hereinafter to be referred as CDMA) switching controls technical field in the mobile communication system, refer to especially the communication quality indication parameter is introduced the soft handover method that a kind of mistake frame indication in the CDMA soft handoff mechanism activates.
So-called soft handover is when travelling carriage begins to get in touch with a new base station, do not interrupt immediately with original base station between communicating by letter, its is kept in touch with former base station and new base station in handoff procedure simultaneously, with assurance communicate by letter unimpeded.Soft handover comprises between the sub-district of different base station, between two sectors of different base station, the sub-district of different base station and the switching of sector three party.Its advantage is: 1. reduced call drop or call interruption probability; 2. be seamless switching, keep communication continuity; 3. improve transmission quality, reduced the transmitted power of travelling carriage.In a word, the basic goal of soft handover is in order to realize communication quality by the smooth transition of former base station to the purpose base station, and it makes communication quality better and increased capacity to a certain extent, is one of advantage technology that embodies cdma system.
Present cdma system all adopts the variation of the pilot signal strength (or signal interference ratio) of moving table measuring base station to activate soft handover, be near the pilot signal strength (or signal interference ratio) of the base station moving table measuring, with the foundation of these measured values as management adjacent pilot frequencies collection, candidate's pilot set, effective pilot set and activation soft handover.Wherein, 1. effective pilot set is meant and the corresponding pilot set in base station of getting in touch.2. candidate's pilot set is meant currently not at effective pilot set, but existing enough intensity shows the pilot set that can be moved platform success demodulation with the corresponding service in base station channel of this pilot tone.3. the adjacent pilot frequencies collection be meant current not at effectively pilot set or candidate's pilot set, but the pilot set that can enter candidate's pilot set under certain condition.
During soft handover, the cdma system travelling carriage utilizes a plurality of single path receiving branchs of multipath (RAKE) receiver, beginning is set up service link with new base station, but do not interrupt simultaneously the service link with original serving BS, receive up to travelling carriage and just cut off when former signal of base station is lower than a threshold value and the getting in touch of former base station.Existing soft switching process is such:
(1) user is current with the logical language of base station A; The pilot signal strength (or signal interference ratio) that arrives certain new base station B when moving table measuring is above behind a certain thresholding T_ADD, and travelling carriage will send a pilot signal strength (or signal interference ratio) to the base station A that is conversing and measure message.
(2) after base station A receives pilot signal strength (or signal interference ratio) measurement message, comprehensive various factors is through certain algorithm, think and to forward this candidate base station B to effective pilot set from candidate's pilot set, and the transmission switch indicating information is used base station A and B simultaneously to travelling carriage indication travelling carriage.
(3) after travelling carriage is received this switch indicating information, the pilot signal of candidate base station B is moved to effective pilot set from candidate's pilot set, bring into use effective pilot set (A, B), and send all and change and finish message.
(4) (when T_DROP＜T_ADD) was following, travelling carriage started the switching of the effective pilot set of this pilot tone and removes timer when pilot tone a-signal intensity (or signal interference ratio) drops to another thresholding T_DROP.
(5) effectively pilot set switch remove timer then after, travelling carriage sends a pilot signal strength (or signal interference ratio) and measures message.
(6) base station receives this pilot signal strength (or signal interference ratio) and measures message, comprehensive various factors is through certain algorithm, think and base station A can be moved to the adjacent pilot frequencies collection from effective pilot set, and the loopback switch indicating information is only used base station B to travelling carriage indication travelling carriage.
(7) travelling carriage moves to the adjacent pilot frequencies collection to base station A from effective pilot set, and sends handoff completion message.
Wherein, T_ADD and T_DROP provide by network layer for the threshold value of startup, ends soft handover.
In above-mentioned soft switching process, when travelling carriage enters the intersection of a plurality of base stations, because weakening of influence that multiple access disturbs and signal strength signal intensity, the communication quality of travelling carriage is variation, but the purpose pilot signal strength (or signal interference ratio) of adjacent base station does not reach T_ADD as yet near T_ADD, promptly the condition according to strength of pilot channels activation soft handover satisfies, therefore, may cause travelling carriage still to fail to enter soft switching process, communication quality has taken place to be worsened, and even the situation of call drop, thereby the advantage technology of this cdma system of soft handover can not or can not be played a role fully.In addition, in handover procedure, when travelling carriage has been crossed when Zone switched, the signal quality of new sub-district has been enough to guarantee to provide good communication quality, but this moment is not because the pilot signal strength of former sub-district is lower than T_DROP, travelling carriage also can continue to keep and the getting in touch of former sub-district, and will take the resource of " unnecessary " like this, thereby reduce the capacity of whole system.
In view of this, in Chinese patent CN00107632.9, the soft handover method of a kind of CDMA has been proposed, be in the change triggers mechanism that keeps the pilot signal strength that moving table measuring arrives, the detected continuous a plurality of wrong mistake frames of communication quality indication parameter-travelling carriage indicate acting in conjunction to start to activate by introducing.It is that the indication of mistake frame is incorporated in the existing handover mechanism, but does not change the hardware environment and the signaling design of existing cdma system, only the control corresponding flow process is made an amendment slightly, and be to effectively replenishing that prior art is carried out.But also just owing to consider compatibility with prior art, this technical characterstic can not be brought into play to a greater extent, make system slower to the reaction of soft handover, system resource can not effectively be utilized.
The object of the present invention is to provide a kind of soft handover method of cdma system, it is when will missing frame indication and being incorporated in the soft handoff mechanism, indication is done dynamic adjustment to the threshold value that starts, finish to switch according to the mistake frame, make system can discharge resource as soon as possible, thereby improve power system capacity to a greater degree.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of soft handover method that is applied to cdma system, it is characterized in that this system comes acting in conjunction to start by the variation of introducing the measured pilot signal strength of communication quality indication parameter and travelling carriage and activates soft switching process, simultaneously, travelling carriage is indicated according to communication quality the threshold value of startup, ends soft handover is dynamically adjusted.Wherein, this communication quality indication parameter is the detected continuous a plurality of erroneous frame indications of travelling carriage.
Described dynamic adjustment comprises the steps:
A. indication judges whether n continuous erroneous frame to travelling carriage according to communication quality, then enters step b if having, otherwise enters step c;
B. judge that whether the T_ADD value is greater than T_ADD_MIN, if then the T_ADD value deducts T_ADD_STEP for T_ADD at this moment;
Judge that whether the T_DROP value is greater than T_DROP_MIN, if then the T_DROP value deducts T_DROP_STEP for T_DROP at this moment;
Enter step a;
C. indication judges whether that n successive frame all is correct frame to travelling carriage according to communication quality, then enters steps d if having, otherwise enters step a;
D. judge that whether the T_ADD value is less than T_ADD_MAX, if then the T_ADD value adds T_ADD_STEP for T_ADD at this moment;
Judge that whether the T_DROP value is less than T_DROP_MAX, if then the T_DROP value adds T_DROP_STEP for T_DROP at this moment;
Enter step a.
Wherein, T_ADD is for starting the threshold value of soft handover, and T_DROP is ends soft handover, starts and switch the threshold value of removing timer that this value provides by network layer.T_ADD_MIN is for guaranteeing the correct minimum threshold that switches, and T_ADD_MAX is for guaranteeing the correct high threshold of switching, and T_ADD_STEP is a step-length of adjusting T_ADD, and this value rule of thumb is worth setting by system.T_DROP_MIN is for guaranteeing the correct minimum threshold that switches, and T_DROP_MAX is for guaranteeing the correct wealthy family limit value that switches, and T_DROP_STEP is a step value of adjusting T_DROP, and this value rule of thumb is worth setting by system.In addition, also rule of thumb value setting of the value of the n that is mentioned.
When travelling carriage measures the pilot signal strength that new base station is arranged in candidate's pilot set when surpassing T_ADD value, according to the method for prior art, travelling carriage directly sends strength of pilot channels measurement message, by base station initiated activation soft switching process fully.
The soft handover method of a kind of cdma system provided by the present invention has following effect:
At first, the basic goal of soft handover is to distinguish the speech quality of process more for improving travelling carriage, the present invention directly is incorporated into the detection of a kind of indication-erroneous frame of speech quality in the trigger mechanism of soft handover, makes reaction method that travelling carriage worsens the speech quality of distinguishing process more more rapidly, directly.
Secondly, the present invention has remedied the deficiency of existing cdma system soft switching process, utilize the indication of mistake frame when the communication quality variation, in time start soft switching process, and according to the testing result of communication quality to starting and the threshold T _ ADD and the T_DROP of ends soft handover do dynamic adjustment, the system that makes reacts faster to soft handover, and free system resources as soon as possible, thereby improve power system capacity greatly, and improve better that communication quality in district's process more worsens and even the situation of call drop.
The 3rd, the present invention need not to change handoff procedure, system hardware and signaling design, is that the effective of existing cdma system soft hand-off replenished, and makes it be easier to realize, and is easier to carry out on existing cdma system the function expansion.
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
Fig. 1 is the embodiment schematic diagram of the inventive method;
Fig. 2 realizes the receiver block diagram of the inventive method for cdma system.
At first, see also shown in Figure 1ly, suppose when travelling carriage begins to converse 1 the A position in the base station, move the B position to base station 2 in communication process.The latter half of Fig. 1 is given in travelling carriage in this process received variation and soft switching process from the pilot frequency intensity of base station 1, base station 2.
If according to traditional soft switching process, base station 2 joins effective pilot set constantly at t2, t2 to t3 in the time period travelling carriage receive and merge multipath signal from base station 1, base station 2, withdraw from effective pilot set in base station 1 constantly at t4, soft switching process finishes.
Yet, when t1, be carved into t2 constantly during this period of time in, base station 1 signal strength signal intensity descends very fast, speech quality runs down, although the intensity of base station 2 is suitable with base station 1, but do not reach the T_ADD value as yet, therefore can't join effective pilot set, cause its stronger signal can not be received machine and effectively utilize.Therefore, be likely that travelling carriage does not carry out soft switching process as yet, this communication process is the call drop because of the quick deterioration of speech quality.On the other hand, after entering soft changing state, base station 2 signal strength signal intensity increases are very fast, the needs of independent support communication can have been reached, but base station 1 signal strength signal intensity descends not less than T_DROP, so soft handover is kept continuing, base station 1 shared Radio Resource still can't obtain discharging.
The soft handover method specific implementation process that mistake frame provided by the present invention indication activates is such:
(1) the current use of user base station A communication; When judging according to the current error rate or frame error rate or other indexs, base station A finds that communication quality is very poor, and the pilot signal strength (or signal interference ratio) of finding existing adjacent base station near but during not greater than thresholding T_ADD (greater than T_ADD_MIN less than T_ADD), start this handover mechanism.
(2) travelling carriage obtains the frame quality indication of every frame on its channel-decoding unit.
According to the detection statistics result, travelling carriage is done following dynamic adjustment to T_ADD:
The continuous n frame of-Ruo all is an erroneous frame, whether then judges T_ADD greater than T_ADD_MIN, if then deduct T_ADD_STEP;
The continuous n frame of-Ruo all is correct frame, whether then judges T_ADD less than T_ADD_MAX, if then add T_ADD_STEP;
-other situation, T_ADD is constant.
Wherein T_ADD_MIN is the minimum value that T_ADD can obtain, and T_ADD_MAX is the maximum that T_ADD can obtain, and T_ADD_STEP is a step-length of adjusting T_ADD, and more than value all can be by default.
According to measurement result, travelling carriage is also done following dynamic adjustment to T_DROP simultaneously:
The continuous n frame of-Ruo all is an erroneous frame, whether then judges T_DROP greater than T_DROP_MIN, if then deduct T_DROP_STEP;
The continuous n frame of-Ruo all is correct frame, whether then judges T_DROP less than T_DROP_MAX, if then add T_DROP_STEP;
-other situation, T_DROP is constant.
Wherein T_DROP_MIN is the minimum value that T_DROP can obtain, and T_DROP_MAX is the maximum that T_DROP can obtain, and T_DROP_STEP is a step-length of adjusting T_DROP, and more than value all can be by default.
So the purpose of adjusting is for better assurance speech quality and free system resources as soon as possible.When having measured continuous n mistake frame, the communication quality that base station A is described worsens, reduce the T_ADD value this moment can make system start soft handover as soon as possible, communication quality when enabling new base station communication as early as possible and could guarantee to distinguish more, also reducing the T_DROP value when reducing the T_ADD value is for after independently fully supporting communication requirement in new base station, withdraw from soft handover as early as possible, to discharge the shared Radio Resource of base station A.When measuring a continuous n frame when all being correct frame, illustrate that base station A can also guarantee current communication quality, enough good communication quality can not be provided if switch perhaps new base station this moment, but the Radio Resource of " unnecessary " can be taken; The communication quality that perhaps new base station also can provide, but use base station A and new base station to cause the waste of resource equally simultaneously, therefore, strengthen the T_ADD value this moment and make system postpone the startup soft handover, thereby avoid causing resource waste, and farthest improved the capacity of system.
(3) after the pilot signal strength (or signal interference ratio) of moving table measuring certain base station B in candidate's pilot set surpasses a certain thresholding T_ADD, travelling carriage will send a pilot signal strength (or signal interference ratio) to the base station A that is conversing and measure message.
(4) after the base station receives this pilot signal strength (or signal interference ratio) measurement message, comprehensive various index is through certain algorithm, think and candidate base station B can be moved to effective pilot set from candidate's pilot set, and the transmission switch indicating information is used base station A and B simultaneously to travelling carriage indication travelling carriage.
(5) after travelling carriage was received this switch indicating information, B moved to effective pilot set from candidate's pilot set with this candidate base station, brought into use effective pilot set (A, B).
(6) (when T_DROP＜T_ADD) was following, travelling carriage started the switching of the effective pilot set of this pilot tone and removes timer when pilot tone a-signal intensity (or signal interference ratio) drops to another thresholding T_DROP.
(7) effectively pilot set switch remove timer then after, travelling carriage sends a pilot signal strength (or signal interference ratio) and measures message.
(8) base station receives this pilot signal strength (or signal interference ratio) and measures message, comprehensive various factors is through certain algorithm, think and base station A can be moved to the adjacent pilot frequencies collection from effective pilot set, and the loopback switch indicating information is only used base station B to travelling carriage indication travelling carriage.
(9) travelling carriage moves to the adjacent pilot frequencies collection to base station A from effective pilot set, and sends handoff completion message.
Wherein, T_ADD and T_DROP provide by network layer for the threshold value of startup, ends soft handover.
In the above-mentioned implementation process of the present invention, be that a kind of indication parameter-mistake frame of communication quality is indicated in the soft handoff mechanism that is incorporated into existing pilot signal strength triggering, to existing systems hardware, flow process and signaling design do not increase or change, as long as the threshold value to the control soft handoff procedure is done the corresponding dynamic adjustment, so just can avoid just producing before travelling carriage does not enter soft switching process as yet communication quality worsens, and even the phenomenon of call drop, make this travelling carriage relatively waltz through the critical days that call drop took place to the t3 time period t2, realize travelling carriage from the base station 1 to the base station 2 handovers stably, the communication quality when having guaranteed handover; Simultaneously, can make travelling carriage find to enter soft handover as soon as possible after communication quality worsens, and can promptly after base station 2 is enough to provide reliable speech quality, allow base station 1 withdraw from soft switching process as early as possible, the Radio Resource of early release base station 1 in the suitable moment.
Referring again to shown in Figure 1, detailed process of the present invention is as follows:
At t1 constantly, base station 1 signal strength signal intensity descends very fast, travelling carriage monitors speech quality by frame error rate (FER) to begin to worsen, simultaneously travelling carriage also detect base station 2 signal greater than T_ADD_MIN less than T_ADD, this moment, travelling carriage started the soft switching process that the indication of mistake frame activates, and the signal strength signal intensity that makes full use of base station the last 2 is improved speech quality.
T2 to t3 in the time period travelling carriage keep soft changing state, receive and merge multipath signal from base station 1, base station 2.The very fast increase of the signal strength signal intensity of base station 2, communication quality is better in the quite a while, T_DROP dynamically increases, and at t3 constantly, base station 1 is promptly less than T_DROP, thereby withdraw from effective pilot set, soft switching process finishes, and base station 1 is in the t3 moment, rather than t4 promptly discharges Radio Resource constantly, t3 promptly can be other user to the Radio Resource in this section of t4 service is provided, thereby has improved the capacity of system to greatest extent.
The receiver block diagram that Fig. 2 realizes for the soft handover method that the indication of cdma system mistake frame activates.According to shown in Figure 2, for obtaining the frame quality indication of every frame, after the decoding of voice data channel, judgment frame is correct frame or erroneous frame, and the result is fed back to CPU or DSP, triggers, finishes mistake frame indication soft switching process according to condition of the present invention and process.Mistake frame indication soft handover does not influence the soft switching process under the normal condition.
Above-mentioned is one embodiment of the invention only, is not in order to limit protection scope of the present invention.
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| CN 00109423 CN1132471C (en) | 2000-06-23 | 2000-06-23 | Soft switching method for CDNA system |
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| CN 00109423 CN1132471C (en) | 2000-06-23 | 2000-06-23 | Soft switching method for CDNA system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006066447A1 (en) * | 2004-12-21 | 2006-06-29 | Zte Corporation | A method for wireless terminal dynamically switching window in a wireless lan environment |
| CN100359985C (en) * | 2003-12-25 | 2008-01-02 | 华为技术有限公司 | A Method for Reducing the Soft Handover Ratio of Code Division Multiple Access System |
| CN100403845C (en) * | 2004-11-30 | 2008-07-16 | 华为技术有限公司 | A Method of Improving Handover Success Rate in Wideband Code Division Multiple Access System |
| CN100455102C (en) * | 2004-06-07 | 2009-01-21 | 华为技术有限公司 | A Soft Handover Method for Code Division Multiple Access System |
| CN1520078B (en) * | 2003-01-22 | 2010-04-28 | 华为技术有限公司 | A Method for Adjusting Soft Handoff Threshold |
| WO2011035697A1 (en) * | 2009-09-22 | 2011-03-31 | 中兴通讯股份有限公司 | Load-adjustment factor notification method, data rate control (drc)-pointing determination method, handover determination method and devices thereof |
| CN102143557A (en) * | 2011-01-26 | 2011-08-03 | 清华大学 | Airborne-bus-based civil aeroplane mobile communication cabin access system and method |
| CN101356839B (en) * | 2005-08-26 | 2012-08-15 | 朗迅科技公司 | Handoff method for use in wireless communications network with shared supplemental spreading codes |
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2000
- 2000-06-23 CN CN 00109423 patent/CN1132471C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1520078B (en) * | 2003-01-22 | 2010-04-28 | 华为技术有限公司 | A Method for Adjusting Soft Handoff Threshold |
| CN100359985C (en) * | 2003-12-25 | 2008-01-02 | 华为技术有限公司 | A Method for Reducing the Soft Handover Ratio of Code Division Multiple Access System |
| CN100455102C (en) * | 2004-06-07 | 2009-01-21 | 华为技术有限公司 | A Soft Handover Method for Code Division Multiple Access System |
| CN100403845C (en) * | 2004-11-30 | 2008-07-16 | 华为技术有限公司 | A Method of Improving Handover Success Rate in Wideband Code Division Multiple Access System |
| WO2006066447A1 (en) * | 2004-12-21 | 2006-06-29 | Zte Corporation | A method for wireless terminal dynamically switching window in a wireless lan environment |
| US7746826B2 (en) | 2004-12-21 | 2010-06-29 | Zte Corporation | Method for wireless terminal dynamically switching window in a wireless LAN environment |
| CN101356839B (en) * | 2005-08-26 | 2012-08-15 | 朗迅科技公司 | Handoff method for use in wireless communications network with shared supplemental spreading codes |
| WO2011035697A1 (en) * | 2009-09-22 | 2011-03-31 | 中兴通讯股份有限公司 | Load-adjustment factor notification method, data rate control (drc)-pointing determination method, handover determination method and devices thereof |
| US9030997B2 (en) | 2009-09-22 | 2015-05-12 | Zte Corporation | Load-adjustment factor notification method, data rate control (DRC)-pointing determination method, handover determination method and devices thereof |
| CN102143557A (en) * | 2011-01-26 | 2011-08-03 | 清华大学 | Airborne-bus-based civil aeroplane mobile communication cabin access system and method |
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