CN102469533B - Cell switching method and system thereof, terminal and base station - Google Patents
Cell switching method and system thereof, terminal and base station Download PDFInfo
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- CN102469533B CN102469533B CN201010538284.1A CN201010538284A CN102469533B CN 102469533 B CN102469533 B CN 102469533B CN 201010538284 A CN201010538284 A CN 201010538284A CN 102469533 B CN102469533 B CN 102469533B
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Abstract
The invention discloses a cell switching method and a system thereof, a terminal and a base station. The method comprises the following steps that: a terminal receiving a switching command, wherein the switching command carries a control channel element (CCE) aggregation level used by a target cell; the terminal extracts the CCE aggregation level from the switching command as well as cell switching is carried out according to the CCE aggregation level. According to the invention, a CCE aggregation level is obtained from a switching command, so that a problem that too much time is consumed when a blind test mode is used to obtain a CCE aggregation level can be solved as well as a problem that time delay is serious during a cell switching process is also solved; therefore, a success rate for the cell switching is improved.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of cell switching method, terminal, base station and system.
Background technology
Existing LTE (Long-Term Evolution, referred to as LTE) each control channel unit (Control Channel Element in system, referred to as CCE) comprise 9 REGs (Resource Element Groups, Resource Unit group), each REG comprises 4 REs, and namely a CCE is the continuous resource block comprising 36 RE.So determine substantially can calculate total CCE quantity afterwards in system bandwidth with for symbol (symbol) quantity of PDCCH (High Speed Physical Downlink Control Channel, Physical Downlink Control Channel).UE (User Equipment, subscriber equipment) generally do not know current DCI (Downlink Control Information, Downlink Control Information) what transmit is the information of what form, does not also know the information oneself needed is in which position.Such as, but UE knows that oneself is current in what information of expectation, and the information expected at idle (Idle) state UE is paging information (paging), system information (System Information) etc.; Initiate Stochastic accessing (Random Access) afterwards it is contemplated that RACH (Random Access Channel, direct access communications channels) response message; When there being upstream data etc. to be sent, expect UL (Up-Link, up link) authorization message etc.
For different expectation information UE corresponding RNTI (Radio NetworkTemporary Index, the interim index of Wi-Fi) go to be CRC (CyclicRedundancy Check with CCE information, cyclic redundancy check (CRC)), if CRC check success, so UE just knows that this information is oneself needs, process that Here it is so-called " blind check ".Although UE has divided CCE public search space (Common Search Space) and the specific search volume of UE (UE-Specific Search Space) according to agreement, different information is searched in different spaces, but due to the blind check of CCE, still make UE take a long time.Simultaneously for the information of some form, a CCE is carrying not, and may need multiple CCE, related protocol defines the so-called degree of polymerization (CCE Aggregation Level), and its value is 1,2,4,8.Such as 4 are only had for the information fusion degree be positioned in public space, 8 two kinds of values, so just first press 4CCE when UE search for granular search one time, then press 8CCE be that granular search one time is just passable.But because eNodeB can't tell that the CCE that UE uses at present is how many, the blind check that therefore UE must carry out repeatedly just can search the CCE oneself used; Wherein, public search space is 16 CCE of foremost; The original position of the specific search volume of UE is according to the formulae discovery in related protocol, and space size is relevant with the degree of polymerization, and the minimum CCE of UE is 6, is 16 to the maximum.
In relevant switching flow, after UE receives switching command, need to determine that Target cell uses several CCE by above-mentioned blinded fashion, and as shown in the above, this blind check process will make the time delay of switching strengthen, and requiring higher scene, can reduce handover success rate for switching.
Summary of the invention
Main purpose of the present invention is to provide a kind of cell switching method, terminal, base station and system, at least to solve in above-mentioned cell switch process the problem existed compared with long time delay.
According to an aspect of the present invention, provide a kind of cell switching method, comprising: terminal receives switching command, wherein, this switching command carries the control channel unit CCE degree of polymerization that Target cell uses; Terminal extracts this CCE degree of polymerization from switching command, carries out cell merge according to the CCE degree of polymerization.
According to a further aspect in the invention, provide a kind of terminal, comprising: switching command receiver module, for receiving switching command, wherein, this switching command carries the control channel unit CCE degree of polymerization that Target cell uses; Cell merge module, extracts the CCE degree of polymerization in the switching command that receives from switching command receiver module, carries out cell merge according to this CCE degree of polymerization.
According to another aspect of the invention, provide a kind of base station, degree of polymerization determination module, for determining the current control channel unit CCE degree of polymerization according to handoff scenario parameter; Switching command sending module, sends to terminal for the CCE degree of polymerization determined by degree of polymerization determination module by switching command.
In accordance with a further aspect of the present invention, provide a kind of cell handover system, comprise above-mentioned terminal and above-mentioned base station.
By the present invention, adopt and obtain the CCE degree of polymerization from switching command, avoid and adopt blinded fashion to obtain the CCE degree of polymerization larger problem consuming time, solve in cell switch process the problem existed compared with long time delay, and then improve the success rate of cell merge.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart of the cell switching method according to the embodiment of the present invention 1;
Fig. 2 is the flow chart of the cell switching method according to the embodiment of the present invention 2;
Fig. 3 is the structured flowchart of the terminal according to the embodiment of the present invention 3;
Fig. 4 is the structured flowchart of the base station according to the embodiment of the present invention 4;
Fig. 5 is the structured flowchart of the cell handover system according to the embodiment of the present invention 5.
Embodiment
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Consider that the terminal in existing cell switch process needs to carry out the blind check acquisition CCE degree of polymerization before the handover, have impact on efficiency and the success rate of cell merge.Based on this, embodiments provide a kind of cell switching method, terminal, base station and system.
Embodiment 1
Fig. 1 shows the flow chart of the cell switching method according to the embodiment of the present invention, and the method comprises the following steps:
Step S102, terminal receives switching command, and wherein, this switching command carries the CCE degree of polymerization that Target cell uses;
The switching command of the present embodiment can be one of following: RRC (Radio ResourceControl, wireless heterogeneous networks) connects reprovision order (RRCConnectionReconfiguration), the order of physical channel reprovision or the order of RB reprovision.Which, as the base station selected use concrete switching command of Target cell, can determine according to the cell merge flow process in correlation technique.
Step S104, this terminal extracts the CCE degree of polymerization from above-mentioned switching command, carries out cell merge according to this CCE degree of polymerization.
Negotiations process in the target BS correlation technique of the present embodiment, can determine that allowing current UE to switch comes, and reserve which type of resource to this UE, target BS is when sending switching command, except carrying the above-mentioned CCE degree of polymerization, existing information in correlation technique also can be carried.
After above-mentioned terminal moves to Target cell from cell-of-origin, the cell merge of initiating this terminal will be determined in the base station of Target cell, do not need to make terminal to carry out the CCE degree of polymerization that blind check just can obtain Target cell use, before above-mentioned steps S102, the method also comprises: the current CCE degree of polymerization is determined according to handoff scenario parameter in the base station of Target cell, by switching command, the CCE degree of polymerization determined is sent to this terminal.Wherein, handoff scenario parameter refers to the scheduling of resource parameter relevant to scheduling of resource situation, switches field intensity and translational speed etc.Wherein, translational speed refers to the translational speed of UE, and this speed base station can be detected by frequency deviation.
Preferably, to determine that the current CCE degree of polymerization comprises according to handoff scenario parameter one of following in the base station of Target cell:
1) the current CCE degree of polymerization is determined according to scheduling of resource parameter in the base station of Target cell;
2) the current CCE degree of polymerization is determined according to scheduling of resource parameter and switching field intensity in the base station of Target cell;
3) the current CCE degree of polymerization is determined according to scheduling of resource parameter and translational speed in the base station of Target cell.
Such as: according to handoff scenario parameter, the base station of Target cell determines that the current CCE degree of polymerization comprises: the CCE degree of polymerization allowing to adopt is determined in the base station of Target cell according to switching field intensity or translational speed; The 2nd CCE degree of polymerization allowing to adopt is determined in the base station of Target cell according to scheduling of resource parameter; Value less in a base station selected CCE degree of polymerization of Target cell and the 2nd CCE degree of polymerization is as the current CCE degree of polymerization.
The terminal of the present embodiment, by obtaining the CCE degree of polymerization from switching command, avoids and adopts blinded fashion to obtain the CCE degree of polymerization larger problem consuming time, solve in cell switch process the problem existed compared with long time delay, and then improve the success rate of cell merge.
Embodiment 2
Embodiments provide a kind of cell switching method, the method realizes according to the cell merge flow process in correlation technique, as shown in Figure 2, this switching flow comprises the following steps: step S202, before fast mobile terminal to Target cell, the process of relevant switch decision has been carried out in the base station of Target cell, has then initiated switching command, has carried the CCE degree of polymerization in this switching command.
When new fast mobile terminal is learnt to this community in Target cell, by the judgement to handoff scenario, be judged to be the situation using CCE, according to switching field intensity, also can determine CCE service condition according to translational speed.
Such as judge to switch field intensity: if switch field intensity to be greater than-80dbm, adopt 2 CCE; If switch field intensity to be greater than-90dbm, be less than-80dmb and adopt 4 CCE; If switching field intensity is less than-90dmb and adopts 8 CCE; A is set to by with the value switching the CCE degree of polymerization that field intensity is determined;
Target cell is determined maximumly can adopt the CCE degree of polymerization according to scheduling of resource situation, is assumed to be B;
The CCE degree of polymerization that Target cell is finally determined is Min (A, B), and namely minimum in A and B value is as the CCE degree of polymerization;
The CCE degree of polymerization, by switching command, such as, is added in HOcmd order (RRC ConnectionReconfiguration) in Target cell, notice UE.
Step S204, UE get the CCE degree of polymerization by above-mentioned switching command, carry out follow-up switching flow.
Wherein, the cell structure of above-mentioned switching command RRCConnectionReconfiguration is as follows:
RRCConnectionReconfiguration message
--ASN1START
RRCConnectionReconfiguration::＝SEQUENCE{
rrc-TransactionIdentifier RRC-TransactionIdentifier，
criticalExtensions CHOICE{
cl CHOICE{
rrcConnectionReconfiguration-r8
RRCConnectionReconfiguration-r8-Ies，
spare7NULL，
spare6NULL，spare5NULL，spare4NULL，
spare3NULL，spare2NULL，spare1NULL
}，
criticalExtensionsFuture SEQUENCE{}
}
}
RRCConnectionReconfiguration-r8-IEs::＝SEQUENCE{
measConfig MeasConfig OPTIONAL，--
Need ON
mobilityControlInfo MobilityControlInfo OPTIONAL，--
Cond HO
dedicatedInfoNASList SEQUENCE(SIZE(1..maxDRB})OF
edicatedInfoNAS OPTIONAL，--
Cond nonHO
radioResourceConfigDedicated
RadioResourceConfigDedicated OPTIONAL，--
Cond HO-toEUTRA
securityConfigHO SecurityConfigHO OPTIONAL，--
Cond HO
nonCriticalExtension SEQUENCE{}OPTIONAL--
Need OP
}
SecurityConfigHO::＝ SEQUENCE{
handoverType CHOICE{
intraLTE SEQUENCE{
securityAlgorithmConfig
SecurityAlgorithmConfig OPTIONAL，--Need OP
keyChangeIndicator BOOLEAN，
nextHopChainingCount
NextHopChainingCount
}，
interRAT SEQUENCE{
securityAlgorithmConfig
SecurityAlgorithmConfig，
nas-SecurityParamToEUTRA OCTET STRING
(SIZE(6))
}
}，
}
--ASN1STOP
The above-mentioned CCE degree of polymerization can be added in certain order of this cell, such as:
Cond HO
nonCriticalExtension SEQUENCE{} OPTIONAL--
Need OP。
The present embodiment prenotices UE Target cell to the operable CCE number of this switching UE in the RRCConnectionReconfiguration signaling sent, such UE directly can carry out the detection of CCE, reduce the time required for blind check, improve handover success rate.Meanwhile, owing to distributing the different CCE degree of polymerization according to different handoff scenario, effectively make use of the resource of CCE, improve the service efficiency of resource.
Embodiment 3
Fig. 3 shows the structured flowchart of a kind of terminal according to the embodiment of the present invention, and this terminal comprises:
Switching command receiver module 32, for receiving switching command, wherein, this switching command carries the CCE degree of polymerization that Target cell uses;
The switching command of the present embodiment can be one of following: RRC connects reprovision order (RRC Connection Reconfiguration), the order of physical channel reprovision or the order of RB reprovision.Which, as the base station selected use concrete switching command of Target cell, can determine according to the cell merge flow process in correlation technique.
Cell merge module 34, is connected with switching command receiver module 32, extracts the CCE degree of polymerization, carry out cell merge according to this CCE degree of polymerization in the switching command that receives from switching command receiver module 32.
The terminal of the present embodiment can obtain the CCE degree of polymerization by switching command, and does not need to carry out blind detection operation and obtain the CCE degree of polymerization, solves the problem that the cell merge time delay that brings because of blind check is larger, improves the success rate of cell merge.
Embodiment 4
Fig. 4 shows the structured flowchart of the base station according to the embodiment of the present invention, and this base station comprises:
Degree of polymerization determination module 42, for determining the current CCE degree of polymerization according to handoff scenario parameter;
Switching command sending module 44, is connected with degree of polymerization determination module 42, sends to terminal for the CCE degree of polymerization determined by degree of polymerization determination module 42 by switching command.
Wherein, handoff scenario parameter comprises: the scheduling of resource parameter relevant to scheduling of resource situation, switch field intensity and translational speed etc.According to the difference of handoff scenario parameter, degree of polymerization determination module 42 can comprise one of following:
First determining unit, for determining the current CCE degree of polymerization according to scheduling of resource parameter;
Second determining unit, for determining the current CCE degree of polymerization according to scheduling of resource parameter and switching field intensity;
3rd determining unit, for determining the current CCE degree of polymerization according to scheduling of resource parameter and translational speed.
During specific implementation, degree of polymerization determination module 42 also can adopt following three unit to realize: the first degree of polymerization determining unit, for determining the CCE degree of polymerization allowing to adopt according to switching field intensity or translational speed; Second degree of polymerization determining unit, for determining the 2nd CCE degree of polymerization allowing to adopt according to scheduling of resource parameter; The right determining unit of trimerization, for selecting value less in a CCE degree of polymerization and the 2nd CCE degree of polymerization as the current CCE degree of polymerization.
The switching command of the present embodiment can be one of following: RRC connects reprovision order, the order of physical channel reprovision or the order of RB reprovision.Which concrete switching command of this base station selected use, can determine according to the cell merge flow process in correlation technique.
The CCE degree of polymerization is supplied to terminal by switching command by the base station of the present embodiment, such terminal will not need to carry out blind detection operation just can get the CCE degree of polymerization, solve the problem that the cell merge time delay that brings because of blind check is larger, improve the success rate of cell merge.
Embodiment 5
Fig. 5 shows the structured flowchart of the cell handover system according to the embodiment of the present invention, and this system comprises terminal 30 and base station 40.Wherein, terminal 30 can realize according to the mode in embodiment 3, and base station 40 can realize according to the mode in embodiment 4, repeats no more here.
Above embodiment is applicable to the various handoff scenario of LTE system, above-described embodiment by carrying the CCE degree of polymerization in switching command, tell that the degree of polymerization that the CCE of use will be dispatched in UE Target cell is how many, make terminal not need to carry out blind detection operation, realize responding fast.Add the efficiency of switching, improve handover success rate.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a cell switching method, is characterized in that, comprising:
Terminal receives switching command, and wherein, described switching command carries the control channel unit CCE degree of polymerization that Target cell uses;
Described terminal extracts the described CCE degree of polymerization from described switching command, carries out cell merge according to the described CCE degree of polymerization.
2. method according to claim 1, is characterized in that, before described terminal receives switching command, described method also comprises:
The current CCE degree of polymerization is determined according to handoff scenario parameter in the base station of described Target cell, by switching command, the described CCE degree of polymerization determined is sent to described terminal.
3. method according to claim 2, is characterized in that, according to handoff scenario parameter, the base station of described Target cell determines that the current CCE degree of polymerization comprises one of following:
The current CCE degree of polymerization is determined according to scheduling of resource parameter in the base station of described Target cell;
The current CCE degree of polymerization is determined according to described scheduling of resource parameter and switching field intensity in the base station of described Target cell;
The current CCE degree of polymerization is determined according to described scheduling of resource parameter and translational speed in the base station of described Target cell.
4. method according to claim 2, is characterized in that, according to handoff scenario parameter, the base station of described Target cell determines that the current CCE degree of polymerization comprises:
The CCE degree of polymerization allowing to adopt is determined in the base station of described Target cell according to switching field intensity or translational speed;
The 2nd CCE degree of polymerization allowing to adopt is determined in the base station of described Target cell according to scheduling of resource parameter;
Value less in a base station selected described CCE degree of polymerization of described Target cell and the described 2nd CCE degree of polymerization is as the current CCE degree of polymerization.
5. the method according to any one of claim 1-4, is characterized in that, described switching command is one of following:
Radio resource control RRC connects reprovision order, the order of physical channel reprovision, the order of Resource Block RB reprovision.
6. a terminal, is characterized in that, comprising:
Switching command receiver module, for receiving switching command, wherein, described switching command carries the control channel unit CCE degree of polymerization that Target cell uses;
Cell merge module, for extracting the described CCE degree of polymerization in the described switching command from described switching command receiver module reception, carries out cell merge according to the described CCE degree of polymerization.
7. a base station, is characterized in that, comprising:
Degree of polymerization determination module, for determining the current control channel unit CCE degree of polymerization according to handoff scenario parameter;
Switching command sending module, sends to terminal for the described CCE degree of polymerization determined by described degree of polymerization determination module by switching command.
8. base station according to claim 7, is characterized in that, described degree of polymerization determination module comprises one of following:
First determining unit, for determining the current CCE degree of polymerization according to scheduling of resource parameter;
Second determining unit, for determining the current CCE degree of polymerization according to described scheduling of resource parameter and switching field intensity;
3rd determining unit, for determining the current CCE degree of polymerization according to described scheduling of resource parameter and translational speed.
9. base station according to claim 7, is characterized in that, described degree of polymerization determination module comprises:
First degree of polymerization determining unit, for determining the CCE degree of polymerization allowing to adopt according to switching field intensity or translational speed;
Second degree of polymerization determining unit, for determining the 2nd CCE degree of polymerization allowing to adopt according to scheduling of resource parameter;
The right determining unit of trimerization, for selecting value less in a described CCE degree of polymerization and the described 2nd CCE degree of polymerization as the current CCE degree of polymerization.
10. a cell handover system, is characterized in that, comprises terminal according to claim 6, and the base station described in any one of claim 7-9.
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|---|---|---|---|---|
| US20100215011A1 (en) * | 2009-02-26 | 2010-08-26 | Interdigital Patent Holdings, Inc. | Method and apparatus for switching a resource assignment mode for a plurality of component carriers |
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|---|---|---|---|---|
| US20100215011A1 (en) * | 2009-02-26 | 2010-08-26 | Interdigital Patent Holdings, Inc. | Method and apparatus for switching a resource assignment mode for a plurality of component carriers |
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| Panasonic,等.Format 1C Blind Decoding restrictions.《3GPP TSG RAN1#53,R1-082197:Format 1C Blind Decoding restrictions》.2008,1-2. * |
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