CN100499910C - Soft switching method - Google Patents
Soft switching method Download PDFInfo
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- CN100499910C CN100499910C CNB2003101034647A CN200310103464A CN100499910C CN 100499910 C CN100499910 C CN 100499910C CN B2003101034647 A CNB2003101034647 A CN B2003101034647A CN 200310103464 A CN200310103464 A CN 200310103464A CN 100499910 C CN100499910 C CN 100499910C
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- soft handover
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Abstract
The method includes following steps: RNC sets 1A and 1B event under cofrequency instrument control and its relevant parameter that are transmitted to mobile station; the mobile station reports 1A or 1B event. RNC makes soft switching decision according to the reported 1A or 1B event, and executes the soft switch. The invention uses 1A event to complete the task of 1A, 1C, 1D and 1E, and uses 1B to complete task of 1B and 1F.
Description
Technical field
The present invention relates to the communications field, relate in particular to the travelling carriage soft handover method in a kind of cdma communication system.
Background technology
In the existing cell mobile communication systems,, make that the radio-frequency power of base station is confined within certain scope (sub-district) in the system for the utilance that improves frequency spectrum resource and the capacity of whole system.Enter the another one sub-district when travelling carriage leaves a sub-district, the signal of the original sub-district that this travelling carriage is received inevitable more and more a little less than, and its received signal that enters the sub-district will be more and more stronger just also.In order to keep the communication quality of travelling carriage, must switch to the stronger base station of signal that newly enters by original base station to continuing of this travelling carriage, the notion of switching in Here it is the cell mobile communication systems.
Soft handover is the important feature in the DS cdma system.So-called soft handover, be meant travelling carriage simultaneously with same frequency on a plurality of sub-districts set up Radio Link and communicate.The diversity gain that soft handover can provide in up-downgoing, so soft handover can improve speech quality, reduces advantages such as call drop.
All adopt in the cdma communication system special pilot channel come identifying cells coverage, effects such as phase reference are provided.The judgement of soft handover is based on travelling carriage to the measurement of pilot frequency channel signal.Network terminal by signaling to the travelling carriage configured threshold, as UE (User Equipment, subscriber equipment) detects the pilot signal quality (or level) that monitors the collection sub-district and then report network terminal when being higher than thresholding, whether initiate soft handover by network terminal (radio network controller) decision.
Soft switching process is made of measurement control, measurement report, soft handover judgement, soft handover execution in step.
Present Soft Handover Algorithm mainly adopts the event measurement report trigger mechanism, by RNC (RadioNetwork Controller, radio network controller) issues common frequency measurement control, one general configuration 1A, 1B, 1C, 1D, 1E, 1F measurement event, soft handover for complete function, at least need to comprise 1A～1D incident, each incident is as follows with reference to 25.331 protocol definitions:
The 1A incident: a primary pilot signal quality enters the relative threshold reporting range, and promptly a cell quality has been brought up near best cell or active set comprehensive quality.This incident can the report of commentaries on classics cycle.
The 1B incident: a primary pilot signal quality is left the relative threshold reporting range, and promptly a cell quality has been reduced to far apart from best cell or active set comprehensive quality.
The 1C incident: the quality of sub-district has surpassed the cell quality in the active set in non-active set.This incident can the report of commentaries on classics cycle.
1D incident: the top-quality cell change of current frequency.
The 1E incident: a primary pilot signal quality surpasses absolute thresholding.
The 1F incident: a primary pilot signal quality is lower than absolute thresholding.
UE reports the same frequency measuring case report, RNC adjudicates according to same frequency measuring case report, usually, 1A report triggering soft switching link increases, the deletion of 1B report triggering soft switching link, 1C report triggering soft switching link is replaced, and 1D causes optimum subdistrict to change, 1E report triggering soft switching link increases, the deletion of 1F report triggering soft switching link.RNC initiates above-mentioned soft switching process then.Present Soft Handover Algorithm generally uses 1A～1F incident or 1A～1D (relative threshold algorithm) as the soft handover judgment condition.
Existing soft handover method, comprise 1A～1F event configuration information in the common frequency measurement control messages and (comprised 1A～1D incident at least, if only use relative threshold to carry out the soft handover judgement, only need configuration 1A～1D event configuration information), the measurement control messages of eating dishes without rice or wine like this is bigger, has taken valuable interface-free resources.In addition, disposed 1A～1F incident in the common frequency measurement control, UE will report 1A～1F incident, and according to emulation, 1C～1F event report has accounted for 60% effect, has taken a large amount of interface-free resources.And event report is many more, and the report processing of network side is corresponding with the soft handover judgement also to be increased, and has increased the disposal ability of network side.
Summary of the invention
The invention provides and a kind ofly can effectively save the soft handover method of interface-free resources.
Soft handover method of the present invention is applicable to cdma communication system, and this method comprises the following steps:
(1), RNC is provided with 1A and the 1B incident and the relevant parameter thereof of common frequency measurement control, and is handed down to travelling carriage;
(2), travelling carriage reports 1A or 1B incident;
(3), RNC carries out the soft handover judgement and carries out soft switching process according to 1A or 1B incident that travelling carriage reports;
The relevant parameter that described RNC is provided with the 1A incident comprises: the triggering environment that the 1A incident is set is for monitoring the collection sub-district; Cell status is set is reported as the pilot signal measurements that reports active set and monitor the collection sub-district; The relevant parameter that described RNC is provided with the 1B incident comprises: the triggering environment that the 1B incident is set is an active set cell; Cell status is set is reported as the pilot signal measurements that reports active set and monitor the collection sub-district.The relevant parameter that described RNC is provided with the 1A incident also comprises: it is the active set maximum number that the deexcitation thresholding is set.
According to said method of the present invention, if travelling carriage report 1A incident is then carried out following treatment step:
A) judge whether active set is full, if not, then judgement is carried out soft handover and is increased link; If then carry out the following step;
B) further whether the decision event triggering cell is optimum subdistrict in the measurement result, if, then in measurement result, search the poorest active set cell, trigger soft handover and replace, and to travelling carriage sending measuring control messages; If not, then in measurement result, look into and change the poorest active set cell, trigger soft handover and replace.
Whether the measured value that also includes the judgement triggering cell in the described steps A is greater than a step of setting threshold value, if then triggering soft handover increases link.
Also include in the described steps A and judge whether optimum subdistrict is the step of current optimum subdistrict in the measurement result, if not, then replace current optimum subdistrict, revise current optimum subdistrict information, and issue the common frequency measurement control messages to travelling carriage with the optimum subdistrict in the measurement result.
Among the described step B, if triggering cell is not the optimum subdistrict in the measurement result, judge further then whether optimum subdistrict is current optimum subdistrict in the measurement result, if not, then replace current optimum subdistrict with the optimum subdistrict in the measurement result, revise current optimum subdistrict information, and issue the common frequency measurement control messages to travelling carriage.
According to said method of the present invention, if travelling carriage report 1B incident, then whether the decision event triggering cell is active set cell, if not, and end process process then; If then trigger soft handover deletion link.
According to said method of the present invention, if travelling carriage report 1B incident, whether the measured value that also includes the decision event triggering cell is less than the step of a certain setting threshold value, if then trigger soft handover deletion link.
The present invention utilizes the 1A incident to finish the work that 1A, 1C, 1D, 1E incident are finished in the prior art, utilizes the 1B incident to finish the work that 1B, 1F incident are finished in the prior art.Space interface signaling is reduced, saved valuable interface-free resources, the measurement capability of the UE that the while also saves, the soft handover judgement of RNC also is simplified.And saved Internet resources but do not influenced quality of services for users.
The present invention has improved interoperability and the compatibility of RNC and UE under the prerequisite of not changing agreement, realize fairly simple simultaneously.
Description of drawings
Fig. 1 is a soft handover method flow chart of the present invention.
Fig. 2 is the process chart of 1A event report.
Fig. 3 is the process chart of 1B event report.
Embodiment
The configuration information that only comprises 1A and 1B incident during the common frequency measurement that the present invention issues by RNC is controlled, RNC finishes soft handover increase link, deletion link, link replacement, optimum subdistrict change operation according to 1A and 1B event report that UE reports then, RNC utilizes the 1A event report to finish the work that 1A in the prior art, 1C, 1D, 1E incident can be finished, and the 1B event report is finished the work that 1B in the prior art, 1F incident can finish.
Can be about common frequency measurement control and same-frequency measure reporting relevant information with reference to 3GPP 25.331 agreements.
Fig. 1 is the inventive method flow chart, and its idiographic flow is described below:
The setting of step 1:RNC common frequency measurement control messages also is handed down to UE:
Maximum activity collection number is disposed by the backstage, and scope is 1～6.
Being provided with of common frequency measurement control messages is as follows:
Event triggered, incident number are 2:1A and 1B; Common frequency measurement amount (Intra-frequencymeasurement quantity) is set to CPICH Ec/N0, is set to active set and monitors that collection all reports CPICH Ec/N0 measured value with frequency report amount (Intra-frequencyreporting quantity).
The parameter configuration of 1A incident is as follows: triggering environment (Triggering condition) is Monitored setcells (it is to monitor the collection sub-district that expression triggers the 1A incident), reporting cell state (Reporting Cell Status) is Report all active set cells+cells within monitored set on used frequency (being that Measured Results reports active set and monitors the measured value that collects the sub-district in the 1A event report), deexcitation thresholding (Reporting deactivation threshold) is set to the active set maximum number (after making active set full, can also make the soft handover replacement operation), other parameter can be by an operation manager's configuration or fixed configurations.
The parameter configuration of 1B incident is as follows: triggering environment (Triggering condition) is Active set cells (it is active set cell that expression triggers the 1B incident), and reporting cell state (Reporting Cell Status) is Report all active set cells+cells within monitored set on used frequency (being the measured value that Measured Results reports active set and supervision collection sub-district in the 1B event report).
Step 2:RNC carries out the soft handover judgement according to 1A or the 1B event report that UE reports:
According to the event type of the same-frequency measure reporting of UE, carry out the processing of 1A report respectively, as shown in Figure 2; Or the processing of 1B report, as shown in Figure 3.
Referring to Fig. 2, the processing procedure of 1A report is as follows:
(1) judges whether active set is full, if it is full, supervision collection cell scrambling according to trigger event among the report Event results, in measurement result (Measured Results), search its residing position (according to agreement, tab sequential among the Measured Results is according to the big minispread of measuring amount, if measuring amount is " Ec/No " (Received energy per chip divided by the power density in the band, received signal is divided by band internal power density) or " RSCP " (Received Signal Code Power, received signal code power), the 1st sub-district is optimum subdistrict among the Measured Results), otherwise enter (3).If monitor that the collection sub-district is an optimum subdistrict, find the poorest sub-district in the active set at Measured Results, be equivalent to then monitor that collection reports the 1D incident, the triggering soft handover is replaced, and (measuring Control Parameter and Neighboring Cell List disposes based on optimum subdistrict to issue common frequency measurement control, optimum subdistrict changes, and causes common frequency measurement control to be revised), enter step 3; Otherwise enter (2).
(2) if monitor that the collection sub-district is not an optimum subdistrict, find the poorest sub-district in the active set, be equivalent to monitor that collection reports the 1C incident, trigger soft handover and replace at Measured Results; Judge simultaneously whether optimum subdistrict is current optimum subdistrict among the Measured Results, if not, the optimum subdistrict that then will check and examine among the result is replaced current optimum subdistrict, revise current optimum subdistrict information, and issue common frequency measurement control, otherwise, step 3 directly entered.
(3) if active set is discontented, directly judgement is carried out soft handover and is increased supervision collection sub-district, judge simultaneously whether optimum subdistrict is current optimum subdistrict among the Measured Results, if not, then the optimum subdistrict in the measurement result is replaced current optimum subdistrict, revise current optimum subdistrict information, and issue common frequency measurement control, otherwise, directly enter step 3.
Referring to Fig. 3, the processing procedure of 1B report is as follows:
Judge whether the sub-district of triggering the 1B incident is active set cell, if, trigger soft handover deletion link, enter step 3; Otherwise, directly return.
Step 3: according to the court verdict of RNC, carry out corresponding soft handover implementation, soft handover increases link, soft handover deletion link, soft handover replacement link.
According to the demand of actual soft handover, utilize 1A and 1B incident can finish the function that 1E and 1F incident can be finished.
Cell scrambling according to trigger event in the 1A report, in Measured Results, obtain the Ec/No measured value of this sub-district, judge that this value whether more than or equal to the absolute door limit value (this threshold value can be provided with by an operation manager) of 1E incident, if satisfy, is equivalent to then monitor that collection triggers the 1E incident.
Cell scrambling according to trigger event in the 1B report, in Measured Results, obtain the Ec/No measured value of this sub-district, judge that this value whether smaller or equal to the absolute door limit value (this threshold value can be provided with by an operation manager) of 1F incident, if satisfy, then is equivalent to trigger the 1F incident.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (9)
1, a kind of soft handover method is applicable to cdma communication system, and this method comprises the following steps:
(1), RNC is provided with 1A and the 1B incident and the relevant parameter thereof of common frequency measurement control, and is handed down to travelling carriage;
(2), travelling carriage reports 1A or 1B incident;
(3), RNC carries out the soft handover judgement and carries out soft switching process according to 1A or 1B incident that travelling carriage reports;
Wherein, described RNC relevant parameter that the 1A incident is set comprises: the triggering environment that the 1A incident is set is for monitoring the collection sub-district; Cell status is set is reported as the pilot signal measurements that reports active set and monitor the collection sub-district; The relevant parameter that described RNC is provided with the 1B incident comprises: the triggering environment that the 1B incident is set is an active set cell; Cell status is set is reported as the pilot signal measurements that reports active set and monitor the collection sub-district.
2, soft handover method as claimed in claim 1 is characterized in that: the relevant parameter that described RNC is provided with the 1A incident also comprises: it is the active set maximum number that the deexcitation thresholding is set.
3, soft handover method as claimed in claim 1 or 2 is characterized in that: if travelling carriage report 1A incident is then carried out following treatment step:
A) judge whether active set is full, if not, then judgement is carried out soft handover and is increased link; If then carry out the following step;
B) further whether the decision event triggering cell is optimum subdistrict in the measurement result, if, then in measurement result, search the poorest active set cell, trigger soft handover and replace, and to travelling carriage sending measuring control messages; If not, then in measurement result, look into and change the poorest active set cell, trigger soft handover and replace.
4, soft handover method as claimed in claim 3 is characterized in that: whether the measured value that also includes the judgement triggering cell in the described steps A is greater than a step of setting threshold value, if then triggering soft handover increases link.
5, soft handover method as claimed in claim 3, it is characterized in that: also include in the described steps A and judge whether optimum subdistrict is the step of current optimum subdistrict in the measurement result, if not, then replace current optimum subdistrict with the optimum subdistrict in the measurement result, revise current optimum subdistrict information, and issue the common frequency measurement control messages to travelling carriage.
6, soft handover method as claimed in claim 5, it is characterized in that: among the described step B, if triggering cell is not the optimum subdistrict in the measurement result, judge further then whether optimum subdistrict is current optimum subdistrict in the measurement result, if not, then replace current optimum subdistrict, revise current optimum subdistrict information, and issue the common frequency measurement control messages to travelling carriage with the optimum subdistrict in the measurement result.
7, soft handover method as claimed in claim 1 or 2 is characterized in that: if travelling carriage report 1B incident, then whether the decision event triggering cell is active set cell, if not, and end process process then; If then trigger soft handover deletion link.
8, soft handover method as claimed in claim 7 is characterized in that: whether the measured value that also includes the decision event triggering cell is less than the step of a certain setting threshold value, if then trigger soft handover deletion link.
9, soft handover method as claimed in claim 8, it is characterized in that: include also whether the optimum subdistrict of judging in the measurement result is the step of current optimum subdistrict, if not, then replace current optimum subdistrict with the optimum subdistrict in the measurement result, revise current optimum subdistrict information, and issue the common frequency measurement control messages to travelling carriage.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2003101034647A CN100499910C (en) | 2003-11-03 | 2003-11-03 | Soft switching method |
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| CNB2003101034647A CN100499910C (en) | 2003-11-03 | 2003-11-03 | Soft switching method |
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| CN1614916A CN1614916A (en) | 2005-05-11 |
| CN100499910C true CN100499910C (en) | 2009-06-10 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100441052C (en) * | 2006-09-15 | 2008-12-03 | 中兴通讯股份有限公司 | Method for preventing excessive flux of A interface soft switching message |
| CN100473209C (en) * | 2007-01-09 | 2009-03-25 | Ut斯达康通讯有限公司 | Method of TDD WCDMA system shared channel switch |
| EP2534869A4 (en) * | 2010-02-12 | 2013-07-10 | Research In Motion Ltd | Methods and apparatus to perform measurements |
| TWI419503B (en) * | 2011-10-07 | 2013-12-11 | Acer Inc | Method of handling measurement reporting and related communication device |
| CN103096456B (en) * | 2011-11-08 | 2015-09-09 | 华为技术有限公司 | The method for building up of synchronization link and controller |
| CN104205937B (en) * | 2013-04-03 | 2018-08-21 | 华为技术有限公司 | Downlink information processing method and equipment |
| EP2966906B1 (en) | 2013-04-03 | 2019-08-07 | Huawei Technologies Co., Ltd. | Method and device for processing downlink information |
| CN104244353A (en) * | 2013-06-06 | 2014-12-24 | 华为技术有限公司 | Communication method, radio network controller, and user equipment |
| CN104756550A (en) * | 2013-09-09 | 2015-07-01 | 华为技术有限公司 | Cell switching method, terminal and network device |
| CN104684008A (en) * | 2013-12-02 | 2015-06-03 | 中兴通讯股份有限公司 | Inter-cell soft switching method and implementation device thereof |
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2003
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Non-Patent Citations (4)
| Title |
|---|
| 3GPP TS 25.331 V3.6.0(2001-03). 3rd Generation Partnership Project,Technical Specification Group Radio Access Network, RRC Protocol Specification(Release 1999). 2001 |
| 3GPP TS 25.331 V3.6.0(2001-03). 3rd Generation Partnership Project,Technical Specification Group Radio Access Network, RRC Protocol Specification(Release 1999). 2001 * |
| 蜂窝移动通信系统中的切换. 张永生，李道本.移动通信技术，第4期. 1998 |
| 蜂窝移动通信系统中的切换. 张永生，李道本.移动通信技术，第4期. 1998 * |
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