CN1181697C - Frame offset allocation method - Google Patents
Frame offset allocation method Download PDFInfo
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- CN1181697C CN1181697C CNB011306505A CN01130650A CN1181697C CN 1181697 C CN1181697 C CN 1181697C CN B011306505 A CNB011306505 A CN B011306505A CN 01130650 A CN01130650 A CN 01130650A CN 1181697 C CN1181697 C CN 1181697C
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- 238000007689 inspection Methods 0.000 claims description 2
- 238000004891 communication Methods 0.000 description 2
- 238000013468 resource allocation Methods 0.000 description 2
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Abstract
The present invention discloses a frame bias allocation method. The method is characterized in that a variable group which can be visited by adjacent base stations and is used for recording the numbers of calls owned currently by each frame bias is set; during call establishment and switching, both the number of the calls of each frame bias arranged in the base station and the number of the calls of each frame bias arranged in the adjacent base stations are considered in the aspect of the allocation of the frame bias; the frame bias which has a small number of calls after two times of comparison is allocated. In this way, the frame bias resources of a system are equally utilized; besides, call losses caused by failures of the frame bias allocation during switching can be effectively avoided, and the access success ratio and the switching success ratio of the calls are raised.
Description
Technical field
The present invention relates to the frame biasing technique of CDMA (code division multiple access) communication system, relate in particular to a kind of frame offset allocation method.
Background technology
At present, at moving communicating field, CDMA (Code Division Multiple Access) characteristics such as confidentiality big because of its capacity, that can adopt multiple switching mode and its high speech quality and low transmitting power, voice activation function and height obtain attention and develop.
Because the jumbo characteristics of CDMA are had higher requirement to whole system, on same frequency, synchronization has many users and base station to communicate, and lot of data will be handled in the base station.In addition, the employing of soft hand-off requires the base station to keep communicating by letter with same user simultaneously in a plurality of branches, and this will consume more Internet resources.
In order to solve the problem of communicating by letter with different user at synchronization in the base station, cdma system has adopted the frame biasing technique, be the different processing time-delay of the physical channel radio frames configuration of different user, make the base station certain delay can be arranged on time-domain to the processing of these data, and needn't handle, thereby improve the data-handling capacity of base station in the identical moment.This time of delay is by frame biasing definition, makes the integral multiple of the 1.25ms that processing time of forward direction, reverse traffic channel frame can the delay system time.With the 20ms frame is example, and to the 20ms frame of 0 biasing, base station or travelling carriage will begin to handle when system time is the integral multiple of 20ms; To being biased to the 20ms frame of N, base station or travelling carriage begin to handle in the time of will postponing N * 1.25ms backward on system time is certain integral multiple basis constantly of 20ms.
The frame biasing resource of some is provided in the base station, user in each service can only use a frame biasing at synchronization, and, what soft handover branches are arranged, and forward direction and oppositely shared frame biasing no matter for what Traffic Channels this user has distributed.
The frame biasing is the Internet resources in the cdma system, can have a plurality of users or a plurality of channel to use same frame biasing at synchronization.But for each specific frame biasing, the base station also is limited in the disposal ability of synchronization, if distribute unbalanced, call number in the biasing of some frames is few even do not have, and in some frame biasing a lot of callings being arranged, the phenomenon of call loss just can appear causing because of the failure of frame offset allocations.
Existing frame offset allocation method overcomes the phenomenon of distributing inequality as far as possible.Mainly contain:
1) method of Random assignment: when a new call request, select a frame offset allocations at random, make the calling that inserts in this base station be evenly distributed in each frame biasing as far as possible;
2) method of periodic allocation: to the calling of each access, number distribution from small to large in regular turn, after the frame biasing of sequence number maximum was assigned with, the frame biasing from the sequence number minimum began to distribute again;
3) minimum number distribution method:, write down the call number in each frame biasing, calling of every access, the frame offset allocations of selective call quantity minimum for variable of each frame biasing definition.
The several method of more than enumerating has only guaranteed from the part that the frame biasing of single base station evenly distributes, yet in cdma system, the ratio of soft handover accounts for 30% of whole call number greatly, and each branch uses identical frame biasing in the soft handover.If when calling out initial turn-on, only consider the frame bias profile of this base station, just such phenomenon may appear: distributed a frame biasing that has minimum call number in the source base station side, but the calling of maximum quantity has been arranged in this same frame biasing of target BS side, cause new soft handover branches not set up, not only fail to obtain the gain that soft handover brings, this branch has also become interference source, the quality of influence communication.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of frame offset allocation method is provided, solve the even distribution that frame is setovered, improve to call out and insert success rate and handover success rate from the overall situation.
For achieving the above object, the technical solution used in the present invention is: a kind of frame offset allocation method, at first can be write down the current set of variables that has call number of each frame biasing of base station by adjacent base station being used for of visiting in the home base stations setting;
Comprise the steps: when setting up to call out and alien frequencies direct-cut operation time frame offset allocations takes place
A1, in home base stations, find out and have the biasing of the less relatively partial frame of call number;
A2, calculate in each adjacent base station the frame biasing current call number that have identical respectively with above-mentioned partial frame biasing sequence number;
A3, find out and have the less relatively some frames biasing of call number in the adjacent base station that is calculated, and optional one of them distribute to the calling of setting up;
When soft handover took place, the frame offset allocations comprised the steps:
B1, be that new branch selects the frame identical with source branch sequence number to setover at target BS;
Whether B2, the selected frame biasing of inspection have idling-resource, if having, this frame offset allocations are given new branch and are finished assigning process; If do not have, continue step B3;
B3, in target BS, find out and have the biasing of the less relatively partial frame of call number;
B4, calculate the current call number that has of frame biasing identical in each adjacent base station of target BS respectively with above-mentioned partial frame biasing sequence number;
B5, find out and have the less relatively some frames biasing of call number in the adjacent base station that is calculated, and optional one of them carry out the same frequency direct-cut operation that the frame biasing heavily distributes.
Owing to adopted above technical scheme, when setting up calling and switching, the distribution of frame biasing is not only considered the call number of each frame biasing of base station, place, consider the call number of each frame biasing in the adjacent base station simultaneously, having all less frame biasing of call number after relatively with twice again distributes, make system-frame biasing resource obtain balanced the utilization, the call loss that has caused owing to the failure of frame offset allocations when effectively having avoided switching has simultaneously improved to call out and has inserted success rate and handover success rate.
Description of drawings
Fig. 1 sets up the flow chart of calling out the time frame offset allocations in the inventive method.
Fig. 2 is the flow chart that soft handover time frame offset allocations takes place in the inventive method.
Embodiment
In the methods of the invention, at first be provided with and write down the current set of variables that has call number of each frame biasing of base station by adjacent base station being used for of visiting, can set up a database in concrete the enforcement, write down the adjacent base station of each base station with it.Adjacent base station is provided with according to the planning of system's reality, disposes before system's operation and finishes, and also can dynamically change in the process of system's operation.Again the current call number that has of each frame biasing in each base station is provided with variable, suppose that a base station has 16 frame biasing resources, can define a size and be 16 array Frame_Offset[16], sequence number with frame biasing is made index, Frame_Offset[i] value equal to distribute in this base station the frame biasing to equal the call number of i.In running, this array is dynamically updated, whenever this base station is that a calling branch distributes frame biasing i, with Frame_Offset[i] add up 1; Otherwise whenever discharging the calling branch that a frame biasing equals i, with Frame_Offset[i] subtract 1.And this array is overall as seen, and promptly the adjacent base station of each base station all can obtain the value of this variable
With reference to Fig. 1, comprise the steps: when setting up calling time frame offset allocations
Wherein steps A 1 is to find out to have the less relatively partial frame biasing of call number in home base stations; In concrete the enforcement can through relatively find out quantity be corresponding base station frame number of offsets half have the result of the less relatively frame biasing of call number as this step; Also can set a threshold value T1 earlier, will have call number again and form set C1 as a result of less than the frame biasing of threshold value T1.
Steps A 2 is to calculate the current call number that has of frame biasing identical with above-mentioned partial frame biasing sequence number in each adjacent base station respectively.
Steps A 3 has the less relatively some frame biasings of call number for finding out in the adjacent base station that is calculated, and chooses one of them wantonly and distribute to the calling of setting up; Can have the less relatively frame biasing of call number, picked at random one then by relatively determining 2 in concrete the enforcement; Also can set a threshold value T2 earlier, form set C2 with having call number in the adjacent base station that is calculated less than the frame biasing of threshold value T2 again, optional one distributes from set C2 again.Set C2 is actually the subclass of set C1.
Cdma system can carry out direct-cut operation, promptly takes place when travelling carriage passes through the sub-district that works in different frequency, and interruption is earlier got in touch with former base station, gets in touch with new base station again.
When the alien frequencies direct-cut operation takes place when, because the alien frequencies direct-cut operation is to redistribute Radio Resource on the another one frequency, be equivalent to rebulid calling, thus the assigning process of frame biasing with call out when initially setting up identically, execution comprises that the frame offset allocations of steps A 1, A2 and A3 gets final product on new frequency.
Cdma system can also carry out soft handover, soft handover can only carry out at the interchannel of same frequency, when travelling carriage needs soft handover to switch, is communicated with to cut off with former base station again with new base station earlier and gets in touch, rather than getting in touch again with new base station of elder generation's cut-out and former base station is communicated with.Soft handover can keep the continuity conversed, improves the reliability of switching effectively, significantly reduces and switches the dropped calls that causes.Simultaneously, soft handover can provide diversity, thereby guarantees better speech quality, and has increased capacity to a certain extent.
With reference to Fig. 2, when soft handover took place, the frame offset allocations comprised the steps:
Step B1 is to be that new branch selects the frame identical with source branch sequence number to setover at target BS;
Step B2 is for checking that whether selected frame biasing has idling-resource, if having, gives this frame offset allocations new branch and finishes assigning process; If do not have, continue step B3; Can carry the frame offset information of source branch in the message of soft handover request, target BS can be the identical frame bias of new finger assignments.But data can change during soft handover, and the situation that soft handover branches does not have adequate resources to distribute may take place.The actual physical biasing resource allocation success of Ruo Xin branch then finishes to distribute; Otherwise, if following steps are then carried out in the biasing resource allocation of the new branch reality of request failure.
Step B3 finds out to have the less relatively partial frame biasing of call number in target BS; Step B4 calculates the current call number that has of frame biasing identical with above-mentioned partial frame biasing sequence number in each adjacent base station of target BS respectively; Step B5 finds out to have the less relatively some frame biasings of call number in the adjacent base station that is calculated, and chooses one of them wantonly and carry out the same frequency direct-cut operation that the frame biasing heavily distributes.Wherein step B3 can adopt and set up the identical execution mode of steps A 1 of calling out time frame offset allocations process, and step B5 can adopt and set up the identical execution mode of steps A 3 of calling out time frame offset allocations process.
Claims (5)
1, a kind of frame offset allocation method is characterized in that: can be write down the current set of variables that has call number of each frame biasing of base station by adjacent base station being used for of visiting in the home base stations setting;
Comprise the steps: when setting up to call out and alien frequencies direct-cut operation time frame offset allocations takes place
A1, in home base stations, find out and have the biasing of the less relatively partial frame of call number;
A2, calculate in each adjacent base station the frame biasing current call number that have identical respectively with above-mentioned partial frame biasing sequence number;
A3, find out and have the less relatively some frames biasing of call number in the adjacent base station that is calculated, and optional one of them distribute to the calling of being set up;
When soft handover took place, the frame offset allocations comprised the steps:
B1, be that new branch selects the frame identical with source branch sequence number to setover at target BS;
Whether B2, the selected frame biasing of inspection have idling-resource, if having, this frame offset allocations are given new branch and are finished assigning process; If do not have, continue step B3 to carry out with the frequency direct-cut operation;
B3, in target BS, find out and have the biasing of the less relatively partial frame of call number;
B4, calculate the current call number that has of frame biasing identical in each adjacent base station of target BS respectively with above-mentioned partial frame biasing sequence number;
B5, find out and have the less relatively some frames biasing of call number in the adjacent base station that is calculated, and optional one of them carry out the same frequency direct-cut operation that the frame biasing heavily distributes.
2, frame offset allocation method as claimed in claim 1 is characterized in that: steps A 1 is half of corresponding base station frame number of offsets with finding out the quantity that has the relative less frame biasing of call number described in the B3.
3, frame offset allocation method as claimed in claim 1 is characterized in that: steps A 3 is 2 with finding out the number that has the relative less frame biasing of call number in the adjacent base station that is calculated described in the B5.
4, frame offset allocation method as claimed in claim 1, it is characterized in that: steps A 1 with find out described in the B3 that to have the biasing of the relative less frame of call number be to set a threshold value T1 earlier, will have call number again and form set C1 less than the frame biasing of threshold value T1.
5, frame offset allocation method as claimed in claim 1, it is characterized in that: steps A 3 with find out described in the B5 that to have the biasing of the relative less frame of call number in the adjacent base station that is calculated be to set a threshold value T2 earlier, will have call number again in the adjacent base station that be calculated and form set C2 less than the frame biasing of threshold value T2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011306505A CN1181697C (en) | 2001-08-16 | 2001-08-16 | Frame offset allocation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011306505A CN1181697C (en) | 2001-08-16 | 2001-08-16 | Frame offset allocation method |
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| CN1402568A CN1402568A (en) | 2003-03-12 |
| CN1181697C true CN1181697C (en) | 2004-12-22 |
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| CNB011306505A Expired - Fee Related CN1181697C (en) | 2001-08-16 | 2001-08-16 | Frame offset allocation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100415028C (en) * | 2003-09-11 | 2008-08-27 | 华为技术有限公司 | Method of accessing target base station for mobile terminal switching between base stations |
| CN101692621B (en) * | 2009-09-25 | 2013-07-03 | 中兴通讯股份有限公司 | Method for reducing time delay in links of media interface and base station |
| CN102083092B (en) * | 2009-11-27 | 2013-09-18 | 中国移动通信集团云南有限公司 | Method and device for searching weakly covered cells in time division-synchronous code division multiple access (TD-SCDMA) network |
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