CN1735265A - Different frequency switching method in CDMA communication system - Google Patents
Different frequency switching method in CDMA communication system Download PDFInfo
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- CN1735265A CN1735265A CN 200410058181 CN200410058181A CN1735265A CN 1735265 A CN1735265 A CN 1735265A CN 200410058181 CN200410058181 CN 200410058181 CN 200410058181 A CN200410058181 A CN 200410058181A CN 1735265 A CN1735265 A CN 1735265A
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Abstract
This invention discloses a different frequency switch method in CDMA system. Wherein, UE switches from second carrier frequency of original sub zone into the first carrier frequency of its sub zone; then coming another soft switch from the said first carrier frequency to first carrier frequency of neighbor sub zone. Further, it comprises a access method, which comprises: RNC receives the request from UE, first decides whether the second carrier frequency satisfies the access require, if not, accessing to the first carrier frequency, or else accessing to second carrier frequency. The invention avoids effect of compression mode on sub zone edge, overcomes the added load by quasi-pilot frequency switch method, and decrease drop-dialog rate.
Description
Technical field
The present invention relates to code division multiple access (CDMA) communication technology, be meant the alien frequencies changing method in a kind of cdma communication system especially.
Background technology
In cell mobile communication systems, when travelling carriage (UE) when a sub-district moves to the another one sub-district, in order to keep communication continuity, communication link must be transferred to Target cell by the cell-of-origin, Here it is switches.In cdma communication system, switching can be divided into soft handover and direct-cut operation two big classes.
The characteristics of soft handover are, when UE begins to get in touch with a new sub-district, can not interrupt immediately and the cell-of-origin between get in touch, therefore can not cause service disconnection, and the handover success rate height, be the peculiar technology of cdma communication system.
The characteristics of direct-cut operation are that UE interruption is earlier got in touch with the cell-of-origin, sets up with new sub-district and gets in touch, and therefore can cause the short interruption of communication link.When the carrier frequency of two sub-districts not simultaneously, must carry out direct-cut operation.
In the plot planning at networking initial stage, generally all adopt 3 * 1 NodeB configuration, promptly 3 sectors all dispose 1 identical carrier frequency.The switching in this period all is soft handover or same direct-cut operation frequently.When the telephone traffic of overlay area can not satisfy actual needs, need carry out dilatation.One of them expansion method is exactly to increase new carrier frequency a sector, becomes 3 * 2 NodeB configuration.Like this, newly-increased carrier frequency and original carrier frequency have constituted the same covering relation of alien frequencies, have constituted the alien frequencies neighbouring relations with the original carrier frequency of adjacent domain.
If newly-increased carrier frequency f2 only, as shown in Figure 1, when UE has inserted the f2 carrier frequency of b sub-district, when move a or c sub-district, must carry out the alien frequencies switching by the marginal position in b district a sector.If newly-increased carrier frequency f2 simultaneously in several sectors, as shown in Figure 2, when UE from the f2 carrier frequency of c sub-district when the edge moves, still can carry out with switching frequently.But if UE has inserted the f2 carrier frequency of b or d sub-district, when UE by the edge of b or d sub-district when move a or e sub-district, must carry out alien frequencies and switch.For clarity sake, below the carrier frequency frequency of former access is called second carrier frequency, the access carrier frequency of Target cell is called first carrier frequency.
The alien frequencies changing method that generally adopts is based on the switching of UE different-frequency measure at present.Be the signal quality of UE elder generation measurement target sub-district first carrier frequency, alien frequencies switches to Target cell then.The specific implementation process is:
I, UE are after second carrier frequency of cell-of-origin is set up dedicated channel, and radio network controller (RNC) issues 2D, the control of 2F affair to UE, the signal quality of monitoring cell-of-origin second carrier frequency;
II, when the signal quality of cell-of-origin second carrier frequency is lower than certain absolute door in limited time, UE reports the 2D event report, starts compact model, begins to carry out the measurement of Target cell first carrier frequency.If in the measuring process of carrying out Target cell first carrier frequency, the signal quality of cell-of-origin second carrier frequency returns to again when being higher than certain thresholding, reports the 2F incident, stops different-frequency measure and compact model.
III, in the different-frequency measure process, when the signal quality of finding Target cell first carrier frequency satisfied switching condition, the UE alien frequencies switched to this sub-district.
The 2D incident is: the comprehensive quality of active set is lower than certain absolute thresholding (" Theestimated quality of the currently used frequency is below a certainthreshold ") on the current frequency of utilization, and the 2F incident is: the estimated quality on the current frequency of utilization is higher than certain absolute thresholding (" Theestimated quality of the currently used frequency is above a certain threshold ").
This alien frequencies changing method must carry out the measurement of alien-frequency district.Therefore, needing UE is that double reception is believed machine or if UE is for singly connecing receiver, then must be supported compact model; If UE is for singly connecing receiver and not supporting compact model, then this strategy fails can only call drop.
The another kind of method that solves this alien frequencies switching is the pilot beacon assisted hard hand.Be the signal quality of the pilot beacon of UE elder generation measurement target sub-district, alien frequencies switches to Target cell then.The specific implementation process is:
I, in pilot signal of Target cell configuration, the frequency of this pilot signal is identical with second carrier frequency, and its intensity determines by first carrier frequency, can correctly reflect the signal quality of Target cell first carrier frequency to guarantee this dummy pilot signal;
II, after setting up dedicated channel on second carrier frequency of UE in the cell-of-origin, RNC issues the measurement control of 1A incident, the signal quality relation of second carrier frequency of monitoring cell-of-origin and the first carrier frequency pilot beacon of Target cell to UE;
III, switch when requiring, directly switch to first carrier frequency of Target cell by second carrier frequency of cell-of-origin when the dummy pilot signal intensity of first carrier frequency that monitors Target cell satisfies.
The 1A incident is: 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 sub-district is added active set can obtain than higher merging gain.
Implement this method, at first must set up pilot beacon, but do not stipulate that NodeB must support this function in the agreement at present, if NodeB does not support this function, this strategy can't be carried out.Secondly, this method has added the part pilot signal in system, brought extra interference to system.
Summary of the invention
In view of this, the object of the present invention is to provide the alien frequencies changing method in a kind of cdma communication system, be applied to switch to Target cell from second carrier frequency of cell-of-origin, all there are the alien frequencies changing method in the scene of first carrier frequency in cell-of-origin and Target cell, this changing method is under the prerequisite that guarantees handover success rate and quality of service, can avoid starting compact model or adding dummy pilot signal and to the adverse effect that system brings, the equipment that also need not is supported special function at cell edge.
In order to achieve the above object, the invention provides the alien frequencies changing method in a kind of code division multiple address communication system, be applied to switch to Target cell from second carrier frequency of cell-of-origin, and cell-of-origin and Target cell all exist in the scene of first carrier frequency, this method comprises two steps:
A, in the cell-of-origin, by the second carrier frequency direct-cut operation to first carrier frequency;
B, by the first carrier frequency soft handover of cell-of-origin first carrier frequency to Target cell.
Preferably, can be in advance the attribute of cell-of-origin second carrier frequency be made as carrier frequency and covers the edge, then steps A further may further comprise the steps:
A1, radio network controller issue the measurement control of 2D incident to travelling carriage;
A2,2D Event triggered, travelling carriage reports the 2D incident;
A3, radio network controller are judged the carrier frequency attribute at travelling carriage place, if carrier frequency covers the edge, direct-cut operation is to first carrier frequency of this cell-of-origin; Otherwise carry out based on the switching of measuring, be directly switch to Target cell.
Preferably, can also be in advance the attribute of cell-of-origin second carrier frequency be made as carrier frequency and covers the edge, first carrier frequency of cell-of-origin is configured to the hard handoff targets carrier frequency that carrier frequency covers the edge, and then steps A further may further comprise the steps:
A1, radio network controller issue the measurement control of 2D incident to travelling carriage;
A2,2D Event triggered, travelling carriage reports the 2D incident;
A3, radio network controller are judged the carrier frequency attribute at travelling carriage place, if carrier frequency covers the edge, direct-cut operation is to being the hard handoff targets carrier frequency of its configuration; Otherwise be directly switch to target carrier frequency.
Further, the present invention includes following access step:
A, radio network controller receive from Radio Resource control (RRC) connection of travelling carriage on second carrier frequency of cell-of-origin and set up request message;
The signal to noise ratio of the pilot signal of b, judgement second carrier frequency and the relation of 2D incident absolute door limit value are as if the absolute door limit value less than the 2D incident, execution in step c; Otherwise, execution in step d;
C, the Radio Link of travelling carriage is based upon first carrier frequency of cell-of-origin;
D, the Radio Link of travelling carriage is based upon second carrier frequency of cell-of-origin.
Preferably, in advance in radio network controller, the largest cell number cell that allocating random access channel reports same-frequency measure reporting cell and Random Access Channel to report in the message blocks 11 of cell-of-origin in advance.
Preferably, in advance the second carrier frequency attribute is made as carrier frequency and covers the edge, then described step a further may further comprise the steps:
A1, radio network controller are received the RRC connection request message of travelling carriage;
A2, judgement access carrier attribute are if carrier frequency covers edge, execution in step b; Otherwise execution in step d.
Preferably, in radio network controller the 2D incident absolute door limit value of cell-of-origin is configured to: the absolute door limit value of 2D incident equals to guarantee that the minimum signal to noise ratio of quality of service adds the maximum deviation of signal to noise ratio between cell-of-origin second carrier frequency and first carrier frequency.
Preferably, the maximum deviation in the threshold value configuration of 2D incident is provided with according to the current down load situation of cell-of-origin second carrier frequency and first carrier frequency, and greater than the first carrier frequency down load, maximum deviation is taken as zero as if the second carrier frequency down load; If the second carrier frequency down load then adds a positive signal quality deviation according to load deviation situation less than the first carrier frequency down load.
By such scheme as can be seen, the present invention has realized switching to from the cell-of-origin switching of the different carrier frequency of Target cell by the direct-cut operation in the cell-of-origin and soft handover.Therefore, in handoff procedure, need not start different-frequency measure, for singly connecing receiver, not need to support and start compact model, thereby avoided starting the influence of compact model system at cell edge; Also overcome the influence that brings added burden to system in the pilot beacon changing method.Cover edge and hard handoff targets carrier frequency attribute by carrier frequency being provided with carrier frequency, guaranteed to adopt scene of the present invention correct and hard handoff targets correctly.The signal quality that target carrier frequency in the time of guaranteeing direct-cut operation and access is set of 2D incident thresholding satisfies business need, the lock in time of down link when having reduced to switch, thus reduced the service disconnection time delay.In addition, the cut-in method that provides among the present invention has reduced the probability that alien frequencies switches, and has reduced cutting off rate.
Description of drawings
Fig. 1 is a dilatation scene one;
Fig. 2 is a dilatation scene two;
Fig. 3 is a dilatation scene three;
Fig. 4 is access process figure of the present invention;
Fig. 5 is switching flow figure of the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
The object of the present invention is to provide second carrier frequency that is applied in a kind of cdma communication system from the cell-of-origin to switch to Target cell, and all there are the alien frequencies changing method in the scene of first carrier frequency in cell-of-origin and Target cell.At first, if exist in certain cell x first, second carrier frequency arranged, neighbor cell exists certain sub-district that first carrier frequency is arranged and does not have second carrier frequency, then the second carrier frequency attribute of x sub-district is set to " carrier frequency covering edge " in RNC, and first carrier frequency of x sub-district is set to this " carrier frequency covering edge " corresponding " hard handoff targets carrier frequency ".The absolute thresholding of 2D incident that has the carrier frequency of " carrier frequency covering edge " attribute then is set to: 2D incident absolute door limit value equals to guarantee that the minimum signal to noise ratio of quality of service adds this carrier frequency and its maximum deviation with signal quality between first carrier frequency of sub-district.This maximum deviation is provided with according to the current down load situation of cell-of-origin second carrier frequency and first carrier frequency, and greater than the first carrier frequency down load, maximum deviation is taken as zero as if the second carrier frequency down load; If the second carrier frequency down load is less than the first carrier frequency down load, maximum deviation then adds a positive signal quality deviation according to load deviation situation.Signal quality can also can be received signal code sheet energy (RSCP) for signal to noise ratio, is that signal to noise ratio is that example describes in the present embodiment with the signal quality.But in specific implementation process, also signal to noise ratio hereinafter correspondingly can be replaced with RSCP.Dispose cell again in its corresponding message blocks 11: " RACH reports same-frequency measure reporting " (" Intra-frequency reporting quantity forRACH reporting ") and " the largest cell number of the last report of RACH " (" Maximum numberofreported cells on RACH ") require UE to connect the signal to noise ratio that reports the carrier frequency pilot channel in the request of foundation at RRC.
As shown in Figure 4, the access step of UE is as follows:
As shown in Figure 5, the switch step of UE is as follows:
Step 501, when UE after certain carrier frequency is set up dedicated channel, RNC issues the measurement control of 2D incident to UE;
Step 502, if the signal to noise ratio of this carrier frequency is lower than the absolute door limit value of 2D incident, this means that the signal quality of this sub-district is lower, need switch, then UE reports the 2D incident to RNC;
After step 503, RNC receive the 2D event report, judge whether the connect attribute of carrier frequency of current and UE is " carrier frequency covering edge ", if judged result is for being execution in step 504, otherwise execution in step 508;
Step 504, RNC control UE direct-cut operation arrive " hard handoff targets carrier frequency " for this carrier frequency configuration, order execution in step 505,506,507 then;
After step 505, UE switched to " hard handoff targets carrier frequency ", RNC issued the measurement control of 1A incident to UE;
Step 506,1A Event triggered, then the first CF signal quality of neighbor cell meets the demands, and need carry out soft handover, and UE reports the 1A incident to RNC;
After step 507, RNC received the 1A incident that UE reports, control UE soft handover was to first carrier frequency of neighbor cell;
Step 508, carry out based on the switching of measuring.
Switching based on measurement in the step 508 can be a soft handover, also can be to adopt compact model or adopt the alien frequencies of pilot beacon to switch.
In implementation process, multiple situation may appear, and enumerate three kinds of situations below and illustrated:
First kind of situation: as Fig. 1, the f2 carrier frequency attribute of c sub-district is set to " carrier frequency covering edge ".
Second kind of situation: as Fig. 2, the f2 carrier frequency attribute of b, d sub-district is set to " carrier frequency covering edge ", because move when switching to b or d cell edge the c sub-district, can directly carry out soft handover, is " carrier frequency covering edge " so it is not set.When UE after the f2 of b or d carrier frequency is set up link, when switch a or e sub-district, adopt the switch step among the present invention from the right side edge of b or d sub-district.When the left side edge of b or d sub-district is switched,, then carry out soft handover if soft handover triggers prior to changing method of the present invention between c sub-district or b, d sub-district; Otherwise carry out changing method of the present invention.
The third situation: as Fig. 3, the f2 of g sub-district, f3 carrier frequency attribute are set to " carrier frequency covering edge ", are the f1 carrier frequency of g sub-district for " the hard handoff targets carrier frequency " of its configuration.
In concrete implementation process, can carry out suitable improvement, to adapt to the concrete needs of concrete condition to the method according to this invention.Therefore be appreciated that according to the specific embodiment of the present invention just to play an exemplary role, not in order to restriction protection scope of the present invention.
Claims (8)
1, the alien frequencies changing method in a kind of code division multiple address communication system be applied to switch to Target cell from second carrier frequency of cell-of-origin, and cell-of-origin and Target cell all exists in the scene of first carrier frequency, it is characterized in that the method includes the steps of:
A, in the cell-of-origin, by the second carrier frequency direct-cut operation to first carrier frequency;
B, by the first carrier frequency soft handover of cell-of-origin first carrier frequency to Target cell.
2, method according to claim 1 is characterized in that, the attribute with cell-of-origin second carrier frequency is made as carrier frequency covering edge in advance, and then described steps A further may further comprise the steps:
A1, radio network controller issue the measurement control of 2D incident to travelling carriage;
A2,2D Event triggered, travelling carriage reports the 2D incident;
A3, radio network controller are judged the carrier frequency attribute at travelling carriage place, if carrier frequency covers the edge, direct-cut operation is to first carrier frequency of this cell-of-origin; Otherwise carry out based on the switching of measuring, be directly switch to Target cell.
3, method according to claim 1, it is characterized in that, the attribute of cell-of-origin second carrier frequency is set to carrier frequency and covers the edge in advance, and first carrier frequency of cell-of-origin is set to the hard handoff targets carrier frequency that carrier frequency covers the edge, and then described steps A further may further comprise the steps:
A1, radio network controller issue the measurement control of 2D incident to travelling carriage;
A2,2D Event triggered, travelling carriage reports the 2D incident;
A3, radio network controller are judged the carrier frequency attribute at travelling carriage place, if carrier frequency covers the edge, direct-cut operation is to being the hard handoff targets carrier frequency of its configuration; Otherwise carry out based on the switching of measuring, be directly switch to target carrier frequency.
4, method according to claim 1 is characterized in that, this method further comprises following access step:
A, radio network controller receive sets up request message from the Radio Resource control connection of travelling carriage on second carrier frequency of cell-of-origin;
The signal quality of the pilot signal of b, judgement second carrier frequency and the relation of 2D incident absolute door limit value are as if the absolute door limit value less than the 2D incident, execution in step c; Otherwise, execution in step d;
C, the Radio Link of travelling carriage is based upon first carrier frequency of cell-of-origin;
D, the Radio Link of travelling carriage is based upon second carrier frequency of cell-of-origin.
5, method according to claim 4, it is characterized in that, described step a comprises that further in radio network controller, allocating random access channel reports the largest cell number cell that same-frequency measure reporting cell and Random Access Channel report in the message blocks 11 of cell-of-origin in advance.
6, method according to claim 4 is characterized in that, in advance the second carrier frequency attribute is made as carrier frequency and covers the edge, and described step a further may further comprise the steps:
The wireless resource control connection request message of a1, radio network controller receiving mobile;
A2, judgement access carrier attribute are if carrier frequency covers edge, execution in step b; Otherwise execution in step d.
7, the method for claim 1, it is characterized in that the 2D incident absolute door limit value with the cell-of-origin in radio network controller is configured to: the absolute door limit value of 2D incident equals to guarantee that the minimum signal to noise ratio of quality of service adds the maximum deviation of signal to noise ratio between cell-of-origin second carrier frequency and first carrier frequency.
8, method as claimed in claim 7 is characterized in that, described maximum deviation is provided with according to the current down load situation of cell-of-origin second carrier frequency and first carrier frequency, and greater than the first carrier frequency down load, maximum deviation is taken as zero as if the second carrier frequency down load; If the second carrier frequency down load then adds a positive signal quality deviation according to load deviation situation less than the first carrier frequency down load.
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| CNB200410058181XA CN100397943C (en) | 2004-08-13 | 2004-08-13 | Different frequency switching method in CDMA communication system |
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| CNB200410058181XA CN100397943C (en) | 2004-08-13 | 2004-08-13 | Different frequency switching method in CDMA communication system |
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| CN1735265A true CN1735265A (en) | 2006-02-15 |
| CN100397943C CN100397943C (en) | 2008-06-25 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101877610A (en) * | 2010-06-21 | 2010-11-03 | 中兴通讯股份有限公司 | Method and device for realizing pilot beacon |
| WO2012094972A1 (en) * | 2011-01-10 | 2012-07-19 | 华为技术有限公司 | Frequency point information processing method and user equipment |
| CN101128018B (en) * | 2006-08-14 | 2012-08-08 | 华为技术有限公司 | Switching method and terminal in long evolved system |
| CN102640533A (en) * | 2009-11-30 | 2012-08-15 | 株式会社Ntt都科摩 | Mobile communication terminal, mobile communication system, and mobile communication method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100259846B1 (en) * | 1997-08-22 | 2000-06-15 | 윤종용 | Semi-soft handoff |
| KR100575502B1 (en) * | 1999-08-31 | 2006-05-03 | 유티스타콤코리아 유한회사 | Hard handoff method between frequency in the mobile communication system |
| KR100592597B1 (en) * | 2001-01-10 | 2006-06-26 | 한국전자통신연구원 | A Method for Handover using Compressed Mode and Common Frequency between Neighbor Cells |
| CN1281010C (en) * | 2001-12-11 | 2006-10-18 | 中兴通讯股份有限公司 | Decision method for periodic report and channel interval hard switching |
| CN100454794C (en) * | 2002-08-08 | 2009-01-21 | 中兴通讯股份有限公司 | Hard switchover judging method for wide band CDMA system |
-
2004
- 2004-08-13 CN CNB200410058181XA patent/CN100397943C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101128018B (en) * | 2006-08-14 | 2012-08-08 | 华为技术有限公司 | Switching method and terminal in long evolved system |
| CN102640533A (en) * | 2009-11-30 | 2012-08-15 | 株式会社Ntt都科摩 | Mobile communication terminal, mobile communication system, and mobile communication method |
| CN102640533B (en) * | 2009-11-30 | 2015-11-25 | 株式会社Ntt都科摩 | Mobile communication terminal, mobile communication system and method for mobile communication |
| CN101877610A (en) * | 2010-06-21 | 2010-11-03 | 中兴通讯股份有限公司 | Method and device for realizing pilot beacon |
| WO2011160353A1 (en) * | 2010-06-21 | 2011-12-29 | 中兴通讯股份有限公司 | Method and device for implementing pseudo pilot |
| CN101877610B (en) * | 2010-06-21 | 2014-09-10 | 中兴通讯股份有限公司 | Method and device for realizing pilot beacon |
| WO2012094972A1 (en) * | 2011-01-10 | 2012-07-19 | 华为技术有限公司 | Frequency point information processing method and user equipment |
| US9398507B2 (en) | 2011-01-10 | 2016-07-19 | Huawei Technologies Co., Ltd. | Method and user equipment for processing frequency information |
| US10034216B2 (en) | 2011-01-10 | 2018-07-24 | Huawei Technologies Co., Ltd. | Method and user equipment for processing frequency information |
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| CN100397943C (en) | 2008-06-25 |
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