CN1984464A - Method for increasing switch success rate - Google Patents
Method for increasing switch success rate Download PDFInfo
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- CN1984464A CN1984464A CNA2006100730118A CN200610073011A CN1984464A CN 1984464 A CN1984464 A CN 1984464A CN A2006100730118 A CNA2006100730118 A CN A2006100730118A CN 200610073011 A CN200610073011 A CN 200610073011A CN 1984464 A CN1984464 A CN 1984464A
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Abstract
The method comprises, by presetting base station, the measurements are made for the signal/interference rates of all uplinks of user end (UE) at base station side; the measurement result is reported to radio network controller (RNC); according to the measurement result, RNC reconfigures UE traffic. In invention can improve the switch success rate between HSDPA cell and traditional cell.
Description
Technical field
The present invention relates to the descending access of high-speed packet (HSDPA) technology, refer to a kind of method that improves handover success rate especially.
Background technology
Soft handover is that Wideband Code Division Multiple Access (WCDMA) inserts the new handoff functionality of (WCDMA) system, is used for the migration of portable terminal (UE) between co-frequency cell, to improve handover success rate.The WCDMA standard is divided into a plurality of different versions such as version (Release) 99, Release4, Release5, Release6 according to the time of releasing, hereinafter to be referred as R99, R4, R5, R6 version.
Wherein, the HSDPA technology appears in the R5 version, the sub-district of compatible R99 version of the cell forward of R5 version and R4 version.Here, will support the sub-district of R99 version to be called the R99 sub-district, support the sub-district of R4 version to be called the R4 sub-district, support the sub-district of HSDPA technology to be called the HSDPA sub-district.Accordingly, the business of supporting in the R99 sub-district is called the R99 business, and the business of the use HSDPA technology that the business of supporting in the R4 sub-district is called the R4 business, support in the HSDPA sub-district is called the HSDPA business.Simultaneously, the R99 business only can be supported in the base station in the R99 sub-district; The R4 business only can be supported in the base station in the R4 sub-district, all can not support the HSDPA business; But in the HSDPA sub-district, R99 business, R4 business can not only be supported in the base station, also can support the HSDPA business simultaneously.All support the soft handover function between HSDPA sub-district and the R99 sub-district and between HSDPA sub-district and the R4 sub-district.In this article, claim R99 sub-district and R4 sub-district to be referred to as conventional cell, R99 business and R4 business are referred to as traditional business.
In the prior art, though can support the soft handover of minizone between HSDPA sub-district and the R99 sub-district, but because when wireless network planning, each sub-district all is difficult to guarantee coverage in full accord of up-downgoing wireless signal, therefore cause owing to the R99 sub-district can't demodulation HSDPA business and reason such as up channel power control, and make the soft handover that can't carry out success between HSDPA sub-district and the R99 sub-district, so the call drop phenomenon in the soft switching process is of common occurrence.Below by two examples the problem that exists in the soft switching process between HSDPA sub-district and the R99 sub-district is elaborated.
Fig. 1 is the R99 business for the UE initial service, and UE from the R99 sub-district along track 11 schematic diagrames that move to the HSDPA sub-district.In Fig. 1, A point expression RNC represents that with Active Set, B point that the HSDPA sub-district adds UE the downlink signal quality of HSDPA sub-district is better than the R99 sub-district, the C point represents that UE has arrived the up coverage of HSDPA sub-district, D point expression RNC deletes the R99 sub-district from the Active Set of UE.RNC reshuffles the process of UE business and is in Fig. 1: when UE by the A point, when further leaving the R99 sub-district near HSDPA sub-district arrival B point, measurement by UE reports, RNC finds that the downlink signal quality of HSDPA sub-district is better than the downlink signal quality of R99 sub-district, therefore is changed to the HSDPA business at the B professional reprovision of UE of naming a person for a particular job.
As can be seen from Figure 1, at the B point, because the UE up coverage of no show HSDPA sub-district also, so the HSDPA sub-district can't receive the upward signal of UE, and can only rely on the R99 sub-district to receive the upward signal of UE; But, because RNC has been the HSDPA business with the business configuration of UE at the B point, though therefore the base station of R99 sub-district can receive that the upward signal of UE also can't demodulate the HSDPA Traffic Channel of UE, thereby the professional upward signal of the HSDPA that causes UE interrupts, and then make the interruption of the whole HSDPA business of UE, produce the call drop phenomenon.
Fig. 2 is the HSDPA business for the UE initial service, and UE from the HSDPA sub-district along track 21 schematic diagrames that move to the R99 sub-district.In Fig. 2, up coverage, C point expression RNC that A point expression UE has arrived the R99 sub-district represent that with Active Set sub-district, B point that the R99 sub-district adds UE the downlink signal quality of R99 sub-district is better than the HSDPA sub-district, D point expression RNC deletes the HSDPA sub-district from the Active Set of UE.RNC reshuffles the process of UE business and is in Fig. 2: when UE by A point and C point, when further leaving the HSDPA sub-district near R99 sub-district arrival B point, measurement by UE reports, RNC finds that the downlink signal quality of R99 sub-district is better than the downlink signal quality of HSDPA sub-district, therefore is changed to the HSDPA business at the B professional reprovision of UE of naming a person for a particular job.
As can be seen from Figure 2, when UE moved to C point on the track, increased thresholding because the downlink signal quality of R99 sub-district satisfies Active Set this moment, and RNC then adds the R99 sub-district Active Set of UE.As UE during at the C point, because the C point has been positioned within the up coverage of R99 sub-district, the R99 sub-district can obtain UE quality of uplink signal preferably, so the R99 sub-district can will cause the uplink signal strength of UE to reduce by the uplink transmission power of power control reduction UE like this.
Yet because the current use of UE is the HSDPA business, though UE is nearer and have a good up channel condition from the base station of R99 sub-district, the R99 sub-district can't demodulate the HSDPA business that UE uses all the time; Because at the C point, UE is far away from the base station of HSDPA sub-district again, and the R99 sub-district has reduced the uplink signal strength of UE, so the upward signal of UE can not reach the demodulation threshold of HSDPA sub-district, and normal demodulation can not be carried out to UE in the HSDPA sub-district.Can obtain by the above situation analysis that UE is ordered at C: though the professional reprovision of UE is not changed to the R99 business at C point RNC, but because R99 sub-district and HSDPA sub-district all can't demodulate the upward signal of UE, therefore causing UE upward signal will occur at the C point interrupts, and then make the interruption of the whole HSDPA business of UE, produce the call drop phenomenon.
Between HSDPA sub-district and R4 sub-district, there is the problem between above-mentioned HSDPA sub-district and the R99 sub-district equally.
Can obtain based on above analysis Fig. 1 and Fig. 2, though between HSDPA sub-district and conventional cell, can carry out soft handover, but owing to the call drop phenomenon takes place the UE that makes out of season of reconfiguration traffic in soft switching process, therefore seriously influence quality of services for users, reduced handover success rate.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method that improves handover success rate, uses the success rate that this method can improve handoff procedure, reduces the call drop phenomenon.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of method that improves handover success rate, be provided with and start base station, UE place to UE in each Active Set sub-district the up link signal-to-interference ratio measurement and RNC periodically reported, when UE switched in dissimilar sub-districts, this method may further comprise the steps:
A, RNC be according to the up link signal interference ratio of UE in each Active Set sub-district that base station, UE place periodically reports, judge UE when the up link signal interference ratio that advance into the sub-district whether greater than the up link signal interference ratio of former sub-district, if greater than, then reshuffle the UE business; Otherwise, return steps A.
Wherein, described UE switches in dissimilar sub-districts: UE switches to conventional cell from the HSDPA sub-district;
The described UE of reshuffling business is: reshuffling UE is traditional business.
Wherein, described UE switches in dissimilar sub-districts: UE switches to the HSDPA sub-district from conventional cell; The described UE of reshuffling business is: reshuffling UE is the HSDPA business;
This method further comprises:
When the downlink signal quality in the HSDPA sub-district is better than conventional cell, execution in step A.
Wherein, described UE switches in dissimilar sub-districts: UE switches to the HSDPA sub-district from conventional cell; The described UE of reshuffling business is: reshuffling UE is the HSDPA business;
In the steps A,, when the downlink signal quality of also determining the HSDPA sub-district is better than conventional cell, carry out the described UE business of reshuffling when the up link signal interference ratio of HSDPA sub-district during greater than the up link signal interference ratio of conventional cell; If when the downlink signal quality of HSDPA sub-district is no better than conventional cell, return steps A.
Wherein, described downlink signal quality is: the signal interference ratio of down public guide frequency channel;
The best sub-district of described definite downlink signal quality is: RNC determines according to the cell measurement reporting of UE.
Wherein, the type of described sub-district comprises: conventional cell and HSDPA sub-district.
In addition, described startup base station, UE place to UE in each Active Set sub-district the up link signal-to-interference ratio measurement and to RNC periodically report into:
At UE when conventional cell switches to the HSDPA sub-district, when the downlink quality of HSDPA sub-district is better than conventional cell, RNC then start base station, UE place to UE in each Active Set sub-district the up link signal-to-interference ratio measurement and RNC periodically reported;
This method further comprises:
At UE when the HSDPA sub-district switches to conventional cell, after the UE business is reconfigured to traditional business from the HSDPA business, and when the downlink signal quality of conventional cell is better than the HSDPA sub-district, RNC cancellation base station, UE place to UE in each Active Set sub-district the up link signal-to-interference ratio measurement and RNC periodically reported.
Wherein, describedly when UE switches in dissimilar sub-districts be: when RNC increases link in UE Active Set sub-district.
Wherein, described base station to the up link signal-to-interference ratio measurement of UE in each Active Set sub-district is: according to the method for measurement of Radio Link collection signal interference ratio, collect the up link signal interference ratio of UE in each Active Set sub-district.
Wherein, described conventional cell is: version 99 sub-districts or edition 4 sub-district; Described traditional business is: version 99 business or edition 4 business.
A kind of method that improves handover success rate provided by the present invention, by setting in advance the base station to the measurement of UE at all up link signal interference ratios of base station side, and give RNC with measurement report by the base station, the measurement result of the up link signal interference ratio that reports according to the base station of RNC then, carry out reshuffling of UE business, and then improve success rate for switching.Use method provided by the present invention, by adjusting the opportunity of UE reconfiguration traffic in the handoff procedure between HSDPA sub-district and conventional cell, improve the handover success rate between HSDPA sub-district and the conventional cell greatly, reduced cutting off rate, guaranteed quality of services for users.
Description of drawings
Fig. 1 moves to the schematic diagram of HSDPA sub-district from the R99 sub-district for portable terminal;
Fig. 2 moves to the schematic diagram of R99 sub-district from the HSDPA sub-district for portable terminal;
Fig. 3 is the flow chart of the embodiment of the invention one;
Fig. 4 is the flow chart of the embodiment of the invention two.
Embodiment
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.In an embodiment of the present invention, be that R99 business, conventional cell are the example explanation for the R99 sub-district with the traditional business.
Embodiment one
What embodiment one described is: be the HSDPA business when UE is professional, UE from the HSDPA sub-district when switch the R99 sub-district, UE business reprovision is changed to the process of R99 business.Here, when switch to the R99 sub-district described HSDPA sub-district, can be RNC increases current R99 sub-district in the Active Set of UE link.At this, claim that the HSDPA sub-district is the former sub-district of UE; Claim that the R99 sub-district is the sub-district that enters of UE.
Because in the prior art, what the reshuffling of UE business only considered is downlink signal quality, and does not consider quality of uplink signal, thereby causes UE the call drop phenomenon to occur in handoff procedure.Therefore in order to realize goal of the invention of the present invention, need in the process that the UE business is reshuffled, take into full account the quality of uplink signal of UE.For this reason, RNC need set in advance and start that base station, UE place is measured the up link signal interference ratio of all sub-districts in the UE Active Set and periodically report, so the reconfiguration course of the up link signal interference ratio control UE business of the RNC UE that can periodically report according to the base station in self each sub-district of each Active Set.UE from the HSDPA sub-district when switch the R99 sub-district, the process of reshuffling the UE business as shown in Figure 3:
The up link signal interference ratio of each Active Set sub-district of UE that step 301:RNC reception base station periodically reports.
Step 302:, judge that whether the current up link signal interference ratio of the R99 sub-district that enters of just preparing is greater than the HSDPA sub-district, if then execution in step 303 according to the up link signal interference ratio of UE in each Active Set sub-district that the base station periodically reports; Otherwise, return step 301.
Step 303:RNC is changed to the R99 business with the professional reprovision of UE.
Embodiment two
What embodiment two described is: be the R99 business when UE is professional, UE from the R99 sub-district when switch the HSDPA sub-district, UE business reprovision is changed to the process of HSDPA business.Here, when switch to the HSDPA sub-district described R99 sub-district, can be RNC increases current HSDPA sub-district in the Active Set of UE link.At this, claim that the R99 sub-district is the former sub-district of UE; Claim that the HSDPA sub-district is the sub-district that enters of UE.
Equally, because in the prior art, what the reshuffling of UE business only considered is downlink signal quality, and does not consider quality of uplink signal, thereby causes UE the call drop phenomenon to occur in handoff procedure.Therefore in order to realize goal of the invention of the present invention, need in the process that the UE business is reshuffled, take into full account the quality of uplink signal of UE.For this reason, present embodiment is identical with embodiment one, RNC need set in advance and start that base station, UE place is measured the up link signal interference ratio of all sub-districts in the UE Active Set and periodically report, so the reconfiguration course of the up link signal interference ratio control UE business of the RNC UE that can periodically report according to the base station in self each sub-district of each Active Set.UE from the R99 sub-district when switch the HSDPA sub-district, the process of reshuffling the UE business as shown in Figure 4:
The downlink signal quality of sub-district when the UE measurement finds that the best sub-district of downlink signal quality changes, is then reported to RNC in step 401:UE supervision self Active Set.Here, described downlink signal quality characterizes with the signal interference ratio of down public guide frequency channel usually.
After step 402:RNC receives the measurement report of UE, judge according to the measurement report of UE whether the downlink signal quality of current HSDPA sub-district is better than the downlink signal quality of R99 sub-district, if then execution in step 403; Otherwise, return step 401.
Step 403:RNC collects UE that current base station the reports up link signal interference ratio in self each Active Set sub-district.
Step 404:RNC is according to the up link signal interference ratio of UE in each Active Set sub-district of current collection, and whether the up link signal interference ratio of judging current HSDPA sub-district is greater than the up link signal interference ratio of R99 sub-district, if then execution in step 405; Otherwise, return step 403.
Step 405:RNC is changed to the HSDPA business with the professional reprovision of UE.
In embodiment two, can also be earlier collect UE that the base station the reports up link signal interference ratio in self each Active Set sub-district by RNC, the up link signal interference ratio of UE in each Active Set sub-district that periodically reports according to the base station, whether the up link signal interference ratio of judging current HSDPA sub-district is greater than the R99 sub-district, if, when then the downlink signal quality in the HSDPA sub-district is better than the R99 sub-district, the professional reprovision of UE is changed to the HSDPA business; When if the downlink signal quality of HSDPA sub-district is no better than the R99 sub-district, then continue to collect UE that the base station the reports up link signal interference ratio in self each Active Set sub-district by RNC.
In embodiments of the invention one and embodiment two, for conserve system resources, can also be provided with by RNC dynamically start or the cancellation base station to the measurement of UE up link signal interference ratio in self each Active Set sub-district.Be specially: at UE when conventional cell switches to the HSDPA sub-district, when the downlink quality of HSDPA sub-district is better than conventional cell, RNC then start base station, UE place to UE in each Active Set sub-district the up link signal-to-interference ratio measurement and RNC periodically reported; At UE when the HSDPA sub-district switches to conventional cell, after the UE business is reconfigured to traditional business from the HSDPA business, and when the downlink signal quality of conventional cell is better than the HSDPA sub-district, RNC cancellation base station, UE place to UE in each Active Set sub-district the up link signal-to-interference ratio measurement and RNC periodically reported.
The measurement of the up link signal interference ratio among the present invention: can directly utilize the method for measuring the Radio Link collection in the universal mobile telecommunications system land radio access web (UTRAN) to carry out, just the method for measurement of Radio Link collection signal interference ratio is to collect under the Radio Link collection each up link signal interference ratio line linearity of going forward side by side to add up and obtain, and in the present invention, only need the base station to collect the up link signal interference ratio of UE in each Active Set sub-district and get final product, do not add up and do not need to carry out linearity.Collect the up link signal interference ratio of UE in each Active Set sub-district when the base station and promptly report RNC.
More than be that R99 business, conventional cell are the description of R99 sub-district to traditional business, being adapted to traditional business equally is that R4 business, conventional cell are the situation of R4, is not described in detail in this.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (10)
1, a kind of method that improves handover success rate, be provided with and start base station, mobile terminal UE place to UE in each Active Set sub-district the up link signal-to-interference ratio measurement and radio network controller (RNC) periodically reported, it is characterized in that, when UE switched in dissimilar sub-districts, this method may further comprise the steps:
A, RNC be according to the up link signal interference ratio of UE in each Active Set sub-district that base station, UE place periodically reports, judge UE when the up link signal interference ratio that advance into the sub-district whether greater than the up link signal interference ratio of former sub-district, if greater than, then reshuffle the UE business; Otherwise, return steps A.
2, method according to claim 1 is characterized in that, described UE switches in dissimilar sub-districts: UE switches to conventional cell from the descending access of high-speed packet HSDPA sub-district;
The described UE of reshuffling business is: reshuffling UE is traditional business.
3, method according to claim 1 is characterized in that, described UE switches in dissimilar sub-districts: UE switches to the HSDPA sub-district from conventional cell; The described UE of reshuffling business is: reshuffling UE is the HSDPA business;
This method further comprises:
When the downlink signal quality in the HSDPA sub-district is better than conventional cell, execution in step A.
4, method according to claim 1 is characterized in that, described UE switches in dissimilar sub-districts: UE switches to the HSDPA sub-district from conventional cell; The described UE of reshuffling business is: reshuffling UE is the HSDPA business;
In the steps A,, when the downlink signal quality of also determining the HSDPA sub-district is better than conventional cell, carry out the described UE business of reshuffling when the up link signal interference ratio of HSDPA sub-district during greater than the up link signal interference ratio of conventional cell; If when the downlink signal quality of HSDPA sub-district is no better than conventional cell, return steps A.
5, according to claim 3 or 4 described methods, it is characterized in that described downlink signal quality is: the signal interference ratio of down public guide frequency channel;
The best sub-district of described definite downlink signal quality is: RNC determines according to the cell measurement reporting of UE.
6, method according to claim 1 is characterized in that, the type of described sub-district comprises: conventional cell and HSDPA sub-district.
7, method according to claim 6 is characterized in that, described startup base station, UE place to UE in each Active Set sub-district the up link signal-to-interference ratio measurement and to RNC periodically report into:
At UE when conventional cell switches to the HSDPA sub-district, when the downlink quality of HSDPA sub-district is better than conventional cell, RNC then start base station, UE place to UE in each Active Set sub-district the up link signal-to-interference ratio measurement and RNC periodically reported;
This method further comprises:
At UE when the HSDPA sub-district switches to conventional cell, after the UE business is reconfigured to traditional business from the HSDPA business, and when the downlink signal quality of conventional cell is better than the HSDPA sub-district, RNC cancellation base station, UE place to UE in each Active Set sub-district the up link signal-to-interference ratio measurement and RNC periodically reported.
8, according to the described method of arbitrary claim in the claim 1 to 4,6,7, it is characterized in that, describedly when UE switches in dissimilar sub-districts be: when RNC increases link in UE Active Set sub-district.
9, according to the described method of arbitrary claim in the claim 1 to 4,6,7, it is characterized in that, described base station to the up link signal-to-interference ratio measurement of UE in each Active Set sub-district is: according to the method for measurement of Radio Link collection signal interference ratio, collect the up link of UE in each Active Set sub-district believe in than.
10, according to claim 2,3,4,6 or 7 described methods, it is characterized in that described conventional cell is: version 99 sub-districts or edition 4 sub-district; Described traditional business is: version 99 business or edition 4 business.
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| CNB2006100730118A CN100479581C (en) | 2006-04-10 | 2006-04-10 | Method for increasing switch success rate |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010121418A1 (en) * | 2009-04-21 | 2010-10-28 | Huawei Technologies Co., Ltd. | Method for handover problem identification |
| CN102638861A (en) * | 2011-02-15 | 2012-08-15 | 中兴通讯股份有限公司 | Method and device for selecting high-speed downlink packet access (HSDPA) system service cell |
| CN104394562A (en) * | 2007-10-12 | 2015-03-04 | 高通股份有限公司 | Identification of target node for wireless handoff |
| WO2015085471A1 (en) * | 2013-12-09 | 2015-06-18 | 华为技术有限公司 | Cell handover method and device, and network system |
-
2006
- 2006-04-10 CN CNB2006100730118A patent/CN100479581C/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104394562A (en) * | 2007-10-12 | 2015-03-04 | 高通股份有限公司 | Identification of target node for wireless handoff |
| WO2010121418A1 (en) * | 2009-04-21 | 2010-10-28 | Huawei Technologies Co., Ltd. | Method for handover problem identification |
| EP2417797A1 (en) * | 2009-04-21 | 2012-02-15 | Huawei Technologies Co., Ltd. | Method for handover problem identification |
| EP2417797A4 (en) * | 2009-04-21 | 2012-06-27 | Huawei Tech Co Ltd | Method for handover problem identification |
| CN102638861A (en) * | 2011-02-15 | 2012-08-15 | 中兴通讯股份有限公司 | Method and device for selecting high-speed downlink packet access (HSDPA) system service cell |
| WO2015085471A1 (en) * | 2013-12-09 | 2015-06-18 | 华为技术有限公司 | Cell handover method and device, and network system |
| CN105052204A (en) * | 2013-12-09 | 2015-11-11 | 华为技术有限公司 | Cell handover method and device, and network system |
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| CN100479581C (en) | 2009-04-15 |
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