CN1870815A - Cell switchover method of the best service in broadband CDMA system - Google Patents
Cell switchover method of the best service in broadband CDMA system Download PDFInfo
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- CN1870815A CN1870815A CNA2005100720361A CN200510072036A CN1870815A CN 1870815 A CN1870815 A CN 1870815A CN A2005100720361 A CNA2005100720361 A CN A2005100720361A CN 200510072036 A CN200510072036 A CN 200510072036A CN 1870815 A CN1870815 A CN 1870815A
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Abstract
The invention discloses a cell switching method for serving business in a WCDMA system including the following steps: determining whether the speed of user's equipment serving the business is higher than the maximum rate set by the soft-switching threshold to judge whether the activity quality of said user equipment is higher than the threshold set by the quality of soft switching if so, and if not, the soft switching is done; If so, hardware switching is carried out, which tests the quality information of an activity cell before the switching and carries out its soft switch when the quality of the cell is not good to the serving service with the rate higher than the maximum threshold so as to increase the successful rate of switching and hard switch is processed when its quality is good to secure the front volume of the system.
Description
Technical field
The present invention relates to the broadband CDMA system of radio communication, relate in particular to the cell switching method of the best service in the broadband CDMA system.
Background technology
In WCDMA (Wide-band Code Division Multiple Access, Wideband Code Division Multiple Access (WCDMA)) system, UE (User Equipment, subscriber equipment) is by Node B (base station) access of radio network of sub-district, place.UE in moving can be from the overlay area of a sub-district district more, thereby must continuing from the sub-district " switching " at original UE place with this UE to the sub-district that UE newly enters.In brief, switching is exactly with UE and RNC (Radio Network Controller, radio network controller) connection is transformed into another wireless links from a wireless links, and switching is to realize one of most important means of seamless covering, raising communication quality.
Switching is divided into soft handover and direct-cut operation two big classes, and wherein soft handover is to finish new link earlier to connect before disconnecting original Radio Link; Direct-cut operation is to disconnect the connection that original Radio Link carries out new link afterwards earlier.Soft handover can improve user communication quality, and cutting off rate is low, is the most important switching type among the WCDMA; The shortcoming of soft handover has been that more ground forward-link capacity takies, and also can cause bigger transmission quantity simultaneously on terrestrial interface.Though and direct-cut operation does not take unnecessary forward-link capacity, cutting off rate is higher, causes the interruption in short-term of communication easily.
Professional for the BE in the WCDMA system (Best Effort, best effort), lower to the cutting off rate requirement, and temporarily interrupt insensitive to the business that direct-cut operation causes.In addition, when the speed of BE business is higher, adopt relative other business of soft handover to have higher forward-link capacity to take, can cause the system forward capacitance loss bigger.
Therefore, in the prior art, the cell switching method of BE business is: soft handover flank speed thresholding is set, when the speed of BE business is higher than this soft handover flank speed thresholding, carries out with the frequency direct-cut operation; The BE business that is lower than this soft handover flank speed thresholding is carried out soft handover.
The shortcoming of above-mentioned BE business switch method is that handover success rate is low, according in October, 2003 Huawei Shanghai research and development outfield KPI (Key Performance Indicator) test result, and the test result of other pilot offices, speed is higher than sub-district that the BE business of soft handover flank speed thresholding carries out with direct-cut operation frequently, and success rate is lower than 80%.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of cell switching method of BE business, and speed is higher than the BE business of the high threshold speed of soft handover, has both improved success rate for switching, can guarantee the forward-link capacity of system again preferably.
The cell switching method of the best service in the broadband CDMA system of the present invention may further comprise the steps:
A) judge whether the speed of subscriber equipment the best service is higher than the soft handover flank speed thresholding of setting, if carry out next step;
B) judge that whether the active set cell quality of described subscriber equipment is higher than the soft handover quality threshold of setting, if not, carries out the soft handover of sub-district; If carry out next step;
C) carry out the direct-cut operation of sub-district.
Preferably, comprise between described step a) and the step b):
Ab1) sending measuring control messages, in described measurement control messages configuration 1A periods of events report, the 1D reporting events.
Preferably, described 1A periods of events reports the quality information that comprises active set cell in the information with the 1D reporting events.
Preferably, described step ab1) and between the step b) comprise:
Ab2) when subscriber equipment report 1A incident or 1D incident, by the active set cell quality information that obtains subscriber equipment in the described event report information.
Preferably, comprise between described step b) and the step c): whether the incident of judging described subscriber equipment report is the 1D incident, if, execution in step c); If not, event handling finishes.
Preferably, the measurement index of described active set cell quality comprises: ratio Ec/No, the received signal code power RSCP of Primary Common Pilot Channel of received power in the received power that every wafer requires of Primary Common Pilot Channel and the frequency band.
Preferably, described soft handover quality threshold is-11 decibels.
Preferably, the judged result in the described step a) is carried out the soft handover of sub-district for not the time.
The present invention is by detected activity collection cell quality information before switching generation, the BE business that speed is higher than soft handover flank speed thresholding, when cell quality is relatively poor, carry out the soft handover of sub-district, thereby improved success rate for switching, carry out simultaneously the direct-cut operation of sub-district preferably under the situation, can guarantee the forward-link capacity of WCDMA system again in cell quality.
Description of drawings
Figure 1 shows that the trigger mechanism of 1D incident in the WCDMA system;
Figure 2 shows that one group of typical data that radio signal quality changes in the switch area;
Figure 3 shows that the flow chart of cell switching method of the present invention.
Embodiment
In the WCDMA system, when Radio Link was set up, RNC allocating and measuring control messages was handed down to UE, and UE measures the signal that it receives according to the requirement of measuring control messages, and to RNC report measurement event.RNC carries out judgement and the triggering that switch the sub-district according to the measurement event report of UE.
Carrying out the judgement of switching the sub-district and trigger two the most relevant measurement event with RNC is Event 1A (1A incident) and Event 1D (1D incident).The implication of 1A incident is: 1 P-CPICH (primaryCommon Pilot Channel, Primary Common Pilot Channel) has entered measuring range (reporting range).RNC has entered measuring range when UE detects a pilot signal disposed the 1A reporting events in measuring control messages after, can report the 1A incident; The periodicity that RNC can also dispose the 1A incident reports, and UE can periodically measure and reports its all pilot signals that receive.
The implication of 1D incident is that optimum subdistrict changes.Variable BEST_CELL_1D_EVENT is used for storing current best cell in UE, i.e. the top-quality sub-district of current demand signal.According to the WCDMA agreement, the decision mechanism during the 1D Event triggered is shown below:
10LogM
NotBest≥10LogM
Best+H
1D/2
In the following formula, M
BestBe the measurement result of the sub-district of storing among the variable BEST_CELL_1D_EVENT, M
NotBestBe the measurement result of other sub-districts beyond the sub-district among the variable BEST_CELL_1D_EVENT, H
1DSluggish parameter for the 1D incident.The measurement result Ec/No of sub-district P-CPICH signal (ratio of desired receive power per chip to receive power density in the band normally wherein, the ratio of received power in received power that every wafer requires and the frequency band), or RSCP (Received Signal CodePower, the received signal code power) index, concrete measurement index is given UE by RNC configuration in measuring control messages.
When RNC disposes sluggish Parameter H
1DBe at 0 o'clock with the triggering time delay, the triggering of 1D incident as shown in Figure 1.Among Fig. 1, UE receives 3 pilot signals, and wherein pilot signal 1 is from current best cell, when the measurement result that detects pilot signal 2 as UE surpasses the measurement result of pilot signal 1, reports the 1D incident to RNC.
The sub-district that speed is higher than the BE business of soft handover flank speed thresholding in the prior art switch to adopt the 1D incident as the judgement foundation.When Radio Link was set up, RNC sending measuring control messages configuration UE reported the 1D incident.When RNC receives the lD incident that UE reports, be about to trigger the sub-district of this 1D incident as the Target cell that switches.But in the reality, the signal that alternately mainly occurs in of optimum subdistrict disturbs the strongest place.UE by center of housing estate in the motion process of cell boarder because the signal quality of the reinforcement sub-district of co-channel interference often embodies the trend of flutter fading, especially in some place, turning, street, signal changes violent especially.In other words, the signal variation in the switch area often is mutant form, and the Signalling exchange during the 1D Event triggered often is under the signal condition of severe.
Figure 2 shows that pilot signal 1 is the pilot signal of former sub-district to quite typical one group of data in the switch area signal running parameter collection experiment, pilot signal 2 is for switching the pilot signal of purpose sub-district.If it is measurement index that RNC is configured to the Ec/No of Primary Common Pilot Channel, sluggish Parameter H
1DBe 0, the triggering time delay is 640ms (millisecond).As seen, pilot signal 1 in 800ms, former sub-district Primary Common Pilot Channel the Ec/No index reduce to suddenly-9dB by-5dB (decibel); According to sluggish and trigger the time delay configuration, UE when reporting the 1D incident, former sub-district Primary Common Pilot Channel the Ec/No index drop to-14dB; And RNC issues the physical channel reconfiguration message when carrying out the direct-cut operation of sub-district, and descending sign indicating number transmitting power is limited, and the physical channel reconfiguration message can't normally be received by UE, causes handoff failure.For this signal jumpy, after the 1D Event triggered, often had little time to have finished the switching of sub-district.
The sluggish parameter that reduces the 1D incident will help to improve the failure problem of direct-cut operation with the triggering time delay, but signal is changed milder switch area, and little sluggish parameter and triggering time delay are easy to cause the table tennis triggering of 1D incident.Therefore, only by the parameter setting to the 1D incident, perhaps cause the untimely handoff failure that causes of 1D incident easily, the table tennis that perhaps causes the sub-district to be switched triggers.The sluggishness of configuration 1D incident that will be appropriate and triggering time delay are extremely difficult to be fit to the signal condition of these two kinds of switch areas simultaneously.
As seen, be higher than the BE business of the high threshold speed of soft handover for speed, former cell signal quality is low excessively, the rapid variation of signal is the basic reason that causes the direct-cut operation success rate low.
In the WCDMA system, why soft handover has higher handover success rate than direct-cut operation, and reason is that the peculiar space diversity gain of CDMA can make the link-quality of the up-downgoing channel of UE improve greatly when UE while and two or more cell communication.Therefore, be higher than the BE business of the high threshold speed of soft handover,, change and do soft handover, overcome the quick decline of signal, can improve handover success rate preferably with diversity gain with the switch area of failure easily of direct-cut operation frequently for speed.
For fear of by the 1D Event triggered after the sub-district handoff failure that causes late, the present invention monitors the quality of active set cell by the 1A incident.The periodicity that makes RNC dispose the 1A incident in measuring control information reports, again in conjunction with the 1D reporting events, just can simply assess the active set cell quality, find early whether the cell signal quality worsens, judgement speed is higher than the BE business of the high threshold speed of soft handover and carries out soft handover when active set cell is second-rate, avoids handoff failure; The active set cell quality carries out preferably the time reducing additionally taking of WCDMA power system capacity with direct-cut operation frequently again.
Figure 3 shows that the flow chart of BE service district changing method of the present invention.At step S10, judge whether the speed of BE business is higher than the soft handover flank speed thresholding of setting, if, execution in step S20; If not, carry out the soft handover of sub-district.
Among the step S10 when judged result for not the time, the BE business that speed is lower than soft handover flank speed thresholding is carried out the soft handover of sub-district, and is identical in the idiographic flow of this soft handover and the prior art, repeats no more herein.
At step S20, RNC disposes the 1A periods of events and reports the reporting events with 1D in the measurement control messages that issues, dispose the quality information that comprises the active set cell of UE in 1A periods of events reporting information and the 1D reporting events information simultaneously.
At step S30, RNC waits for the event report of UE.
At step S40, after RNC receives the event report of UE, judge whether it is 1A incident or 1D incident, if not, carry out the processing of other incidents; If, execution in step S50.
At step S50, from 1A periods of events report information or 1D event report information, obtain the quality measurements of UE to active set cell, judge whether this measurement result is higher than the soft handover quality threshold of setting, if, execution in step S60; If not, illustrate that the signal quality of sub-district, current UE place is relatively poor, then carry out the soft handover of sub-district at once.
At step S60, what judge the UE report is 1A incident or 1D incident, if the 1A incident because the signal quality of sub-district, UE place is also relatively good at present, so do not process, is changeed step S30 and waited for next event report; If the 1D incident, then carry out the direct-cut operation of sub-district.
In above-mentioned flow process, the quality of active set cell with which kind of index is weighed and can be provided with in the measurement control messages of RNC by the user, for example the Ec/No of Primary Common Pilot Channel, RSCP.
The soft handover quality threshold also is provided with in RNC by the user, can set according to the concrete condition of overlay area signal.Its recommendation is that the Ec/No of Primary Common Pilot Channel is-11dB.
Switch the sub-district that is higher than the BE business of setting soft handover flank speed thresholding for speed, can cause handover success rate low with the frequency direct-cut operation; Soft handover can cause the loss of system forward capacity.The method of the invention is higher than the sub-district hand-off process of the BE business of setting soft handover flank speed thresholding for speed, combine advantage: by carry out carrying out soft handover in the relatively poor place of signal quality to improve handover success rate in the good place of signal quality with the forward-link capacity of frequency direct-cut operation with assurance WCDMA system with frequency direct-cut operation and soft handover.Thereby the present invention had both improved BE service district success rate for switching, can guarantee power system capacity preferably again.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.
Claims (9)
1. the cell switching method of the best service in the broadband CDMA system is characterized in that, may further comprise the steps:
A) judge whether the speed of subscriber equipment the best service is higher than the soft handover flank speed thresholding of setting, if carry out next step;
B) judge that whether the active set cell quality of described subscriber equipment is higher than the soft handover quality threshold of setting, if not, carries out the soft handover of sub-district; If carry out next step;
C) carry out the direct-cut operation of sub-district.
2. according to the cell switching method of the described the best service of claim 1, it is characterized in that, comprise between described step a) and the step b):
Ab1) sending measuring control messages, in described measurement control messages configuration 1A periods of events report, the 1D reporting events.
3. according to the cell switching method of the described the best service of claim 2, it is characterized in that: described 1A periods of events reports the quality information that comprises active set cell in the information with the 1D reporting events.
4. according to the cell switching method of the described the best service of claim 3, it is characterized in that described step ab1) and step b) between comprise:
Ab2) when subscriber equipment report 1A incident or 1D incident, by the active set cell quality information that obtains subscriber equipment in the described event report information.
5. according to the cell switching method of the described the best service of claim 4, it is characterized in that, comprise between described step b) and the step c): whether the incident of judging described subscriber equipment report is the 1D incident, if, execution in step c); If not, event handling finishes.
6. according to the cell switching method of any described the best service of claim 3 to 5, it is characterized in that the measurement index of described active set cell quality comprises: ratio Ec/No, the received signal code power RSCP of Primary Common Pilot Channel of received power in the received power that every wafer requires of Primary Common Pilot Channel and the frequency band.
7. according to the cell switching method of the described the best service of claim 6, it is characterized in that: described soft handover quality threshold is-11 decibels.
8. according to the cell switching method of the described the best service of claim 6, it is characterized in that: the judged result in the described step a) is carried out the soft handover of sub-district for not the time.
9. according to the cell switching method of claim 1 or 2 any described the best services, it is characterized in that: the judged result in the described step a) is carried out the soft handover of sub-district for not the time.
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| CNB2005100720361A CN100438694C (en) | 2005-05-26 | 2005-05-26 | Cell switchover method of the best service in broadband CDMA system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015032188A1 (en) * | 2013-09-09 | 2015-03-12 | 华为技术有限公司 | Cell switching method, terminal and network device |
| CN104662960A (en) * | 2013-09-09 | 2015-05-27 | 华为技术有限公司 | Cell switching method, terminal and network device |
| CN105103615A (en) * | 2013-02-06 | 2015-11-25 | 爱立信(中国)通信有限公司 | Enhanced solution for handover |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2940615B1 (en) * | 1998-08-14 | 1999-08-25 | 日本電気株式会社 | Handoff selection method in CDMA wireless data communication system |
| EP0996304B1 (en) * | 1998-10-19 | 2007-03-14 | Nortel Matra Cellular | Method and apparatus for setting up a connection to a target base station in a cellular or cordless mobile communications system |
| US6754493B1 (en) * | 1998-12-18 | 2004-06-22 | Telefonaktiebolaget Lm Ericsson | Method and systems for dynamic threshold adjustment for handoffs in radio communication systems |
| CN1154274C (en) * | 2001-01-11 | 2004-06-16 | 华为技术有限公司 | Control method and device for compression mode in CDMA system |
| GB2376603B (en) * | 2001-06-15 | 2003-09-10 | Motorola Inc | Handover in a cellular communication system |
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2005
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105103615A (en) * | 2013-02-06 | 2015-11-25 | 爱立信(中国)通信有限公司 | Enhanced solution for handover |
| CN105103615B (en) * | 2013-02-06 | 2020-01-17 | 爱立信(中国)通信有限公司 | Enhanced solution for handover |
| WO2015032188A1 (en) * | 2013-09-09 | 2015-03-12 | 华为技术有限公司 | Cell switching method, terminal and network device |
| CN104662960A (en) * | 2013-09-09 | 2015-05-27 | 华为技术有限公司 | Cell switching method, terminal and network device |
| CN104756550A (en) * | 2013-09-09 | 2015-07-01 | 华为技术有限公司 | Cell switching method, terminal and network device |
| RU2625165C1 (en) * | 2013-09-09 | 2017-07-12 | Хуавей Текнолоджиз Ко., Лтд. | Cell changing method, final device and network device |
| US10075889B2 (en) | 2013-09-09 | 2018-09-11 | Huawei Technologies Co., Ltd. | Cell change method, terminal, and network device |
| CN104662960B (en) * | 2013-09-09 | 2018-10-19 | 华为技术有限公司 | Switching method, terminal and the network equipment of cell |
| CN109041150A (en) * | 2013-09-09 | 2018-12-18 | 华为技术有限公司 | Switching method, terminal and the network equipment of cell |
| US10863406B2 (en) | 2013-09-09 | 2020-12-08 | Huawei Technologies Co., Ltd. | Cell change method, terminal, and network device |
| CN109041150B (en) * | 2013-09-09 | 2021-02-09 | 华为技术有限公司 | Cell switching method, terminal and network equipment |
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