CN101815328B - Method and equipment for shortening handoff interruption time based on UL (Unordered List) CoMP information - Google Patents
Method and equipment for shortening handoff interruption time based on UL (Unordered List) CoMP information Download PDFInfo
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- CN101815328B CN101815328B CN 200910046848 CN200910046848A CN101815328B CN 101815328 B CN101815328 B CN 101815328B CN 200910046848 CN200910046848 CN 200910046848 CN 200910046848 A CN200910046848 A CN 200910046848A CN 101815328 B CN101815328 B CN 101815328B
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Abstract
The invention provides a handoff method which comprises the steps of: selecting a handoff target base station according to a preset switching base station selection standard by a source base station based on a channel measurement report from user equipment; judging whether the selected target base station is included in a multipoint coordination transmission base station group of the user equipment or not by the source based station based on uplink chain multipoint coordination transmission information specific to the user equipment; generating a handoff command which comprises information indicating the omission of an RACH (Random Access Channel) access process and is specific to the user equipment by the source base station when the selected target base station is included in the multipoint coordination transmission base station group of the user equipment; and omitting the RACH accessing process and directly sending a handoff completion message to the target base station by the user equipment when the handoff command comprises the information indicating the omission of an RACH access process, therefore, by utilizing the CoMP base station group information specific to the user equipment in the UL CoMP information to omit the RACH access process, the handoff interruption time is shortened.
Description
Technical field
The present invention relates to method of handover and equipment in the LTE-advanced system, be specifically related in the system that uses CoMP (cooperative multipoint transmission) method, shorten the handover method and apparatus of break period with the CoMP information of up link.
Background technology
Existing 3GPP has stipulated handover procedure in (the 3rd generation cooperative programme).
Fig. 8 shows the signaling flow graph of existing method of handover, and Fig. 8 has described the flow chart of existing method of handover.
At first, source base station is from the measurement report of subscriber equipment reception about channel quality.When channel quality was deteriorated, source base station was judged and will be carried out handover.At this moment, source base station comes the select target base station according to predetermined handover-target base station choice criteria in step S11.Then, source base station sends hand-off request to determined target BS in step S12.In step S13, target BS is carried out pre-defined algorithm when receiving hand-off request, and to the response of source base station feedback hand-off request.In step S14, the response of source base station based target base station and produce handoff command, and the handoff command that produces sent to subscriber equipment.In step S15, subscriber equipment is carried out the trial of RACH (Random Access Channel) access when receiving handoff command.If the RACH access failure is then proceeded to attempt, until success.When RACH accessed successfully, subscriber equipment sent handover to target BS and finishes message in step S16.In step S17, target BS is finished response message to subscriber equipment feedback handover.Like this, whole handover procedure finishes.
From the above analysis, in LTE (Long Term Evolution) system, the RACH transmission is the principal element that causes the break period of handover procedure between the base station.How can shorten an important difficult problem that remains senior LTE (LTE-advanced) standard break period with the optimization system performance of handover.
The RACH transmission is transmission time and the power in order to adjust subscriber equipment, so that the correctly transmission of receiving uplink of target BS, namely subscriber equipment can access this target BS.
Now, up link (UL) coordinate multipoint (CoMP) transmission is widely used as improving a kind of alternative approach [1] of the uplink performance of LTE-advanced system in 3GPP 36.814.
In UL CoMP scene, a plurality of base stations (being called the CoMP group of base stations) are configured to receive the transmission of same subscriber equipment, and carry out relevant anabolic process.This means that all base stations that comprise in the CoMP group of base stations all can receive the uplink of respective user equipment, that is to say that this subscriber equipment has accessed all base stations in the CoMP group of base stations.
According to current LTE-advanced standard, the residential quarter that the base station covers in the UL CoMP group of base stations is the residential quarter that has to the optimal channel quality of subscriber equipment.
In handover, a major criterion of select target base station is to select to have to the base station of the optimal channel quality of respective user equipment.
Therefore, to belong to the possibility of UL CoMP group of base stations very high for the selected handover-target base station of source base station.
Belong at selected target BS in the situation of UL CoMP group of base stations, because subscriber equipment has accessed target BS, so no longer need the RACH access procedure.
That is to say that in the LTE-advanced system, handover procedure does not need the possibility of RACH transmission course very high.
Current, still do not disclose and anyly shorten the handover method of break period with UL CoMP information.
The inventor recognizes above-mentioned situation, makes the present invention, in the LTE-advanced system that uses UL CoMP method, takes full advantage of UL CoMP information and omit the RACH access procedure in the time will carrying out handover, thereby shorten handover break period.
List of references:
[1]3GPP?36.814：Further?Advancements?for?E-UTRA?PhysicalLayer?Aspects
Summary of the invention
The present invention proposes a kind of subscriber equipment, base station, system and employed method, can utilize the CoMP group of base stations information for subscriber equipment in the UL CoMP information to omit the RACH access procedure, thereby shorten handover break period.
According to the first scheme of the present invention, a kind of subscriber equipment is provided, comprising: receiver module is used for receiving handoff command from source base station; And the random access procedure judge module, be used for when received handoff command comprises that the information of RACH access procedure is omitted in indication, omitting the RACH access procedure, directly send handover to target BS and finish message.
Preferably, if described subscriber equipment do not receive in the given time from described target BS handover is finished the response of message, then described random access procedure judge module is carried out the RACH access procedure.
Preferably, when received handoff command comprised that the information of RACH access procedure is not omitted in indication, described random access procedure judge module was carried out the RACH access procedure.
According to alternative plan of the present invention, a kind of base station is provided, comprising: target BS is selected module, is used for selecting the target BS of handover according to predetermined base station shifting choice criteria according to the channel measurement report from subscriber equipment; The target BS judge module is used for judging according to the uplink coordinated multi-point transmission information for described subscriber equipment whether selected target BS is included in the coordinated multipoint transmission group of base stations of described subscriber equipment; And the switching command generation module, be used for when selected target BS is included in the coordinated multipoint transmission group of base stations of described subscriber equipment, produce for the indication that comprises of described subscriber equipment and omit the handoff command of RACH access procedure information.
Preferably, described predetermined base station shifting choice criteria is: select to have to the base station of the optimal channel quality of described subscriber equipment, as described target BS.
Preferably, described base station also comprises: the Link State evaluation module, be used for when selected target BS is included in the coordinated multipoint transmission group of base stations of described subscriber equipment, assess current uplink synchronization state, wherein when current uplink synchronization state was good, described switching command generation module produced for the indication that comprises of described subscriber equipment and omits the handoff command of RACH access procedure information.
Preferably, when described switching command generation module is not included in the coordinated multipoint transmission group of base stations of described subscriber equipment at selected target BS, produces and do not omit the handoff command of RACH access procedure information for the indication that comprises of described subscriber equipment.
Preferably, described base station also comprises: the handover request generation module, be used for selecting according to described target BS the selection result of module, generation is for the hand-off request of selected target BS, the judged result that comprises the target BS judge module in the described hand-off request is to notify judged result to selected target BS.
Preferably, described switching command generation module is according to the response for hand-off request from selected target BS, generation is for the handoff command of described subscriber equipment, and described handoff command comprises the information that indicates whether to omit the RACH access procedure.
According to third party's case of the present invention, a kind of base station is provided, comprising: the handover request judge module is used for judging according to the hand-off request from source base station whether described base station self is included in the coordinated multipoint transmission group of base stations of subscriber equipment; And switching request response generation module, be used for when described handover request judge module judges that described base station self is included in the coordinated multipoint transmission group of base stations of subscriber equipment, generation comprises the information that the RACH access procedure is omitted in indication for the hand-off request response of described source base station in the described hand-off request response.
Preferably, described base station also comprises: the Link State evaluation module, when being used for self being included in the coordinated multipoint transmission group of base stations of this subscriber equipment in described base station, assess current uplink synchronization state, wherein said switching request response generation module also produces hand-off request response for described source base station according to the assessment result of described Link State evaluation module.
According to cubic case of the present invention, a kind of mobile communication system is provided, comprising: the subscriber equipment of the first scheme according to the present invention; The base station of at least one alternative plan according to the present invention is as source base station; And the base station of at least one third party's case according to the present invention, as target BS.
According to the 5th scheme of the present invention, a kind of method of handover is provided, comprise step: source base station is selected the target BS of handover according to the channel measurement report from subscriber equipment according to predetermined base station shifting choice criteria; Source base station judges according to the uplink coordinated multi-point transmission information for described subscriber equipment whether selected target BS is included in the coordinated multipoint transmission group of base stations of described subscriber equipment; When selected target BS was included in the coordinated multipoint transmission group of base stations of described subscriber equipment, source base station produced for the indication that comprises of described subscriber equipment and omits the handoff command of RACH access procedure information; And when described handoff command comprised that the information of RACH access procedure is omitted in indication, subscriber equipment omitted the RACH access procedure, directly sent handover to target BS and finished message.
Preferably, described predetermined base station shifting choice criteria is: select to have to the base station of the optimal channel quality of described subscriber equipment, as described target BS.
Preferably, before producing described handoff command, described method of handover also comprises step: source base station produces the hand-off request for selected target BS, judged result is notified selected target BS in described hand-off request; Described target BS is according to the hand-off request that comprises notice, generation is for the hand-off request response of described source base station, described hand-off request response comprises the information that indicates whether to omit the RACH access procedure, when selected target BS was included in the coordinated multipoint transmission group of base stations of described subscriber equipment, described hand-off request response comprised the information that the RACH access procedure is omitted in indication; And source base station produces for the handoff command that indicates whether to omit RACH access procedure information comprising of described subscriber equipment according to the hand-off request response that comprises the information that indicates whether to omit the RACH access procedure.
Preferably, described method of handover also comprises step: when selected target BS is included in the coordinated multipoint transmission group of base stations of described subscriber equipment, and the current uplink synchronization state of described target BS assessment; When current uplink synchronization state was good, target BS produced described hand-off request response, and described hand-off request response comprises the information that the RACH access procedure is omitted in indication; And source base station produces for the indication that comprises of described subscriber equipment and omits the handoff command of RACH access procedure information according to the hand-off request response of the information that comprises indication omission RACH access procedure.
Preferably, when selected target BS is not included in the coordinated multipoint transmission group of base stations of described subscriber equipment, described hand-off request response comprises the information that the RACH access procedure is not omitted in indication, and handoff command comprises that indication do not omit RACH access procedure information, perhaps be included in the coordinated multipoint transmission group of base stations of described subscriber equipment but the response of described hand-off request comprises indication when not omitting the information of RACH access procedure at selected target BS, handoff command comprises that indication do not omit RACH access procedure information; And described method of handover also comprises step: when handoff command comprised that RACH access procedure information is not omitted in indication, subscriber equipment carried out the RACH access procedure.
Preferably, if described subscriber equipment do not receive in the given time from described target BS handover is finished the response of message, then described subscriber equipment is carried out the RACH access procedure for described target BS.
Preferably, before producing described handoff command, described method of handover also comprises step: when selected target BS is included in the coordinated multipoint transmission group of base stations of described subscriber equipment, and the current uplink synchronization state of described source base station assessment; And when current uplink synchronization state was good, source base station produced for the indication that comprises of described subscriber equipment and omits the handoff command of RACH access procedure information.
For the subscriber equipment in the LTE-advanced standard, method of handover according to the present invention when the target BS of handover belongs to the cooperative base station of subscriber equipment not the needs subscriber equipment carry out the RACH access procedure, therefore take full advantage of UL CoMP information, can reduce significantly the break period in the handover procedure.
Description of drawings
By reference to the accompanying drawings, according to following detailed description to non-limiting example of the present invention, above-mentioned and other purpose of the present invention, feature and advantage will become clearer, in the accompanying drawing:
Fig. 1 shows the schematic block diagram for the subscriber equipment 20 that carries out handover according to the embodiment of the invention;
Fig. 2 shows the schematic block diagram for the source base station 10 that carries out handover according to the embodiment of the invention;
Fig. 3 shows the schematic block diagram that carries out the target BS 11 of handover according to the user of the embodiment of the invention;
Fig. 4 is according to the signaling flow graph in the method for handover of first embodiment of the invention;
Fig. 5 shows the flow chart according to the method for handover of first embodiment of the invention;
Fig. 6 is according to the signaling flow graph in the method for handover of second embodiment of the invention;
Fig. 7 shows the flow chart according to the method for handover of second embodiment of the invention;
Fig. 8 shows the signaling flow graph in the existing method of handover; And
Fig. 9 has described existing method of handover.
Embodiment
Below, describe by reference to the accompanying drawings embodiments of the invention in detail.In the following description, some specific embodiments only are used for describing purpose, and should not be construed the present invention are had any restriction, and are example of the present invention.It is pointed out that schematic diagram only shows the difference with existing system, and omitted conventional structure or structure, in order to avoid cause the understanding of the present invention unclear.
Embodiments of the invention provide for subscriber equipment and the base station of carrying out method of handover of the present invention.Fig. 1 shows the schematic block diagram for the subscriber equipment 20 that carries out handover according to the embodiment of the invention; Fig. 2 shows the schematic block diagram for the source base station 10 that carries out handover according to the embodiment of the invention; Fig. 3 shows the schematic block diagram for the target BS 11 that carries out handover according to the embodiment of the invention.
In the subscriber equipment 20 according to the embodiment of the invention, subscriber equipment 20 comprises sending module 201, random access procedure judge module 202 and receiver module 203, wherein sending module 201 is used for sending measurement report to the source base station of with it communication, and 203 of receiver modules receive handoff command from source base station.Random access procedure judge module 202 is used for judging whether to carry out the RACH access procedure.Certainly, sending module 201 also is used for sending the handover end to the handoff target base station of with it communication, and 203 handoff target base stations from it communication of receiver module receive handover and finish response.
After receiver module 203 received handoff command from source base station, whether random access procedure judge module 202 comprised that according to handoff command indication omits the information of RACH access procedure, judges whether to carry out the RACH access procedure.Comprise in the situation of indicating the information of omitting the RACH access procedure in handoff command, random access procedure judge module 202 is judged does not need to carry out the RACH access procedure, at this moment, sending module 201 sends handover to target BS and finishes message, and waits for the response from target BS.If receiver module 203 receives the response from target BS in the given time, then handover procedure finishes.Otherwise if receiver module 203 does not receive response in the given time, then subscriber equipment is recognized, current uplink synchronization state is good not.That is to say that random access procedure judge module 202 is judged and will be carried out the RACH access procedure.At this moment, again carry out the conventional RACH access procedure for target BS, and after the success of RACH access procedure, finish handover procedure.
The present invention also provides the base station that is used for the method for handover of the executive basis embodiment of the invention.
When a base station when the source base station 10, as shown in Figure 2, comprise that according to the source base station 10 of the embodiment of the invention target BS selects module 101, target BS judge module 102, handover request generation module 103, switching command generation module 104.
Source base station 10 is after subscriber equipment receives measurement report, and target BS selects module 101 to come the select target base station according to predetermined handoff criteria.
Common selection criterion is to select to have to the base station of the optimal channel quality of subscriber equipment.At this moment, target BS selects module 101 according to measurement report, selects to have the base station of optimal channel quality.
After having selected target BS, whether the selected target BS of target BS judge module 102 judgements is included in for a base station in the group of base stations of the UL CoMP of this subscriber equipment.
For example, the CoMP group of base stations tabulation of subscriber equipment can be stored in base station 10 in its memory, and selected target BS and the tabulation of storing are mated to judge a whether base station in the group of base stations of selected target BS.
Then, handover request generation module 103 sends hand-off request to target BS.Target BS is after receiving hand-off request, to the response of source base station feedback hand-off request.
The hand-off request response of switching command generation module 104 based target base station feedback or the judged result of target BS judge module 102 produce hand-off request and send it to subscriber equipment.
When a base station when the target BS 11, as shown in Figure 3, comprise switching request response generation module 113 according to the target BS 11 of the embodiment of the invention.
When the hand-off request that receives from source base station, switching request response generation module 113 is carried out predetermined algorithm, produces the hand-off request response and also sends it to source base station.
Target BS 11 can also comprise handover request judge module 111, is used for hand-off request is analyzed.At this moment, switching request response generation module 113 produces the hand-off request response according to the analysis result of handover request judge module 111.
Base station according to the embodiment of the invention can also comprise Link State evaluation module 112, is used for the subscriber equipment of this moment and the synchronous regime of the up link between the target BS are assessed.
Although in the target BS 11 of Fig. 3 Link State evaluation module 112 has been shown, it also can be arranged in source base station 10.At this moment, the measurement report of source base station utilization reception carries out the assessment of the synchronous regime of the up link between subscriber equipment and the target BS.
Below with reference to accompanying drawing method of handover according to the embodiment of the invention is described.
The first embodiment
Fig. 4 is according to the signaling flow graph in the method for handover of first embodiment of the invention; Fig. 5 shows the flow chart according to the method for handover of first embodiment of the invention.
Identical with S11, S12, S13, S15, S16, S17 in the existing method of handover shown in Figure 9 respectively according to the step S21 in the method for handover of first embodiment of the invention, S22, S23, S25, S26, S27.Omit specifying same steps as at this.
Method according to first embodiment of the invention is with existing methodical difference, in the method according to first embodiment of the invention, the target BS judge module 102 of source base station 10 judges whether selected target BS belongs to the CoMP group of base stations (step S201) of subscriber equipment after having determined target BS, and receive the hand-off request response from selected target BS after, according to judged result, switching command generation module 104 produces handoff command and sends to subscriber equipment, comprises the information (S24) that indicates whether to omit the RACH access procedure in sending to the handoff command of subscriber equipment.Subscriber equipment judges whether to omit RACH access procedure (S202) based on this information in the handoff command after receiving handoff command.
If target BS judge module 102 is judged the CoMP group of base stations that selected target BS belongs to subscriber equipment in step S201, then in step S24, switching command generation module 104 produces the handoff command of the information that comprises indication omission RACH access procedure.Subscriber equipment directly sends handover to target BS and finishes message after receiving handoff command.Otherwise if selected target BS does not belong to the CoMP group of base stations of subscriber equipment, then handoff command comprises that indication do not omit the information of RACH access procedure.In this case, subscriber equipment is carried out the RACH access procedure in step S25, and finishes message to target BS transmission handover after RACH accesses successfully.
In this embodiment, the signaling such as the hand-off request between source base station and the target BS, hand-off request response is identical with existing signaling.
Certainly, when selected target BS belonged to the CoMP group of base stations of subscriber equipment, the Link State evaluation module 112 in the source base station can further be assessed the current uplink synchronization state of subscriber equipment.If state is enough good, then handoff command comprises the information of indication omission RACH access procedure.Otherwise handoff command comprises that indication do not omit the information of RACH access procedure.
In addition, if subscriber equipment is finished response message at scheduled wait receives the target BS transmission within the time handover, then handover procedure finishes.Otherwise, do not finish response message if receive within the time from the handover of target BS at scheduled wait, then subscriber equipment should be carried out normal RACH access procedure, accesses target BS.
The second embodiment
Fig. 6 is according to the signaling flow graph in the method for handover of second embodiment of the invention; Fig. 7 shows the flow chart according to the method for handover of second embodiment of the invention.
According to the step S31 in the method for handover of second embodiment of the invention, S301, S302, S35, S36, S37 respectively with identical according to the step S21 in the method for handover of first embodiment of the invention, S201, S202, S25, S26, S27.Omit specifying same steps as at this.
Be according to the method for second embodiment of the invention and difference according to the method for first embodiment of the invention, in step S32, switching command generation module 104 produces hand-off request, this hand-off request comprises the judged result of target BS judge module 102, with judged result notification target base station.For example, can be by the respective field set in the existing hand-off request order or reset to represent that the result that judges (for example, the selected target BS of " set " expression belongs to the CoMP group of base stations of subscriber equipment, and the selected target BS of " resetting " expression does not belong to the CoMP group of base stations of subscriber equipment; Vice versa).In step S33, whether target BS according to the judged result in the hand-off request, identifies target BS self and is included in the CoMP group of base stations when receiving hand-off request.
If target BS is included in the UL CoMP group of base stations, mean that then this subscriber equipment has accessed target BS.At this moment, target BS can comprise to the source base station feedback hand-off request response of the information of indication omission RACH access procedure.
In step S34, source base station responds to produce handoff command and sends it to subscriber equipment according to hand-off request receive the hand-off request response from target BS after.If the hand-off request response comprises the indication of omitting the RACH access procedure, then handoff command also comprises same indication.
In this embodiment, source base station comprises to the hand-off request that target BS sends whether the notification target base station belongs to the information of the CoMP group of base stations of subscriber equipment.Comprise the indication of whether omitting the RACH access procedure in the hand-off request response of target BS feedback sources base station.The handoff command that source base station produces is identical with the handoff command among the first embodiment, has the information that indicates whether to omit the RACH access procedure.
Certainly, identical with the first embodiment, when selected target BS belonged to the CoMP group of base stations of subscriber equipment, the Link State evaluation module 112 in the source base station can further be assessed the current uplink synchronization state of subscriber equipment.If state is enough good, then handoff command comprises the information of indication omission RACH access procedure.Otherwise handoff command comprises that indication do not omit the information of RACH access procedure.
Also can be carried out by target BS the assessment of the current uplink synchronization state of subscriber equipment.If state is enough good, then omit the hand-off request response of RACH access procedure to the indication of source base station feedback.Otherwise target BS thinks that current uplink synchronization state is good not, does not then omit the hand-off request response of RACH access procedure to the indication of source base station feedback.
In addition, if subscriber equipment is finished response message at scheduled wait receives the target BS transmission within the time handover, then handover procedure finishes.Otherwise, do not finish response message if receive within the time from the handover of target BS at scheduled wait, then subscriber equipment should be carried out normal RACH access procedure, accesses target BS.
In addition, backward compatibility is an important need of LTE-advanced system.For this problem, according to the method and apparatus of the embodiment of the invention following two kinds of analyses are arranged:
For the LTE subscriber equipment, the LTE-advanced base station has the handover procedure that RACH transmits with request, therefore for not impact of the subscriber equipment among the LTE;
For the LTE-advanced subscriber equipment, the LTE base station has the handover procedure that RACH transmits with request, therefore for the not impact of LTE-advanced subscriber equipment.
From this point, very good according to the backwards compatibility of the method for handover that does not have RACH transmission of the embodiment of the invention.
The embodiment that more than provides is illustrated with the flow process of ad hoc approach and the example that consists of of equipment.It is pointed out that the present invention is not limited to the particular order of steps of the method that schematically illustrates, other step order also is feasible.Certainly, although above description relates to a plurality of modules, by being a plurality of modules with a Module Division or being a module with a plurality of module combinations, as long as it still can carry out corresponding function, also can realize the present invention.
More than describe and only provided the preferred embodiments of the present invention, and be not to limit by any way the present invention.Therefore, any modification of carrying out in the present invention's spirit and principle, replacement, improvement etc. should be contained by claim limited range of the present invention.
Claims (19)
1. subscriber equipment comprises:
Receiver module is used for receiving handoff command from source base station, and wherein target BS is included in the coordinated multipoint transmission group of base stations of described subscriber equipment; And
The random access procedure judge module is used for omitting the RACH access procedure when received handoff command comprises that the information of RACH access procedure is omitted in indication, directly sends handover to described target BS and finishes message.
2. subscriber equipment according to claim 1, if wherein described subscriber equipment do not receive in the given time from described target BS handover is finished the response of message, then described random access procedure judge module is carried out the RACH access procedure.
3. subscriber equipment according to claim 1, wherein when received handoff command comprised that the information of RACH access procedure is not omitted in indication, described random access procedure judge module was carried out the RACH access procedure.
4. base station comprises:
Target BS is selected module, is used for selecting the target BS of handover according to predetermined base station shifting choice criteria according to the channel measurement report from subscriber equipment;
The target BS judge module is used for judging according to the uplink coordinated multi-point transmission information for described subscriber equipment whether selected target BS is included in the coordinated multipoint transmission group of base stations of described subscriber equipment; And
The switching command generation module, be used for when selected target BS is included in the coordinated multipoint transmission group of base stations of described subscriber equipment, generation is omitted the handoff command of RACH access procedure information for the indication that comprises of described subscriber equipment, so that described subscriber equipment omits the RACH access procedure, directly send handover to selected target BS and finish message.
5. base station according to claim 4, wherein said predetermined base station shifting choice criteria is:
Selection has to the base station of the optimal channel quality of described subscriber equipment, as described target BS.
6. also comprise according to claim 4 or 5 described base stations:
The Link State evaluation module is used for assessing current uplink synchronization state when selected target BS is included in the coordinated multipoint transmission group of base stations of described subscriber equipment,
Wherein when current uplink synchronization state was good, described switching command generation module produced for the indication that comprises of described subscriber equipment and omits the handoff command of RACH access procedure information.
7. according to claim 4 or 5 described base stations, wherein
When described switching command generation module is not included in the coordinated multipoint transmission group of base stations of described subscriber equipment at selected target BS, produces and do not omit the handoff command of RACH access procedure information for the indication that comprises of described subscriber equipment.
8. also comprise according to claim 4 or one of 5 described base stations:
The handover request generation module, be used for selecting according to described target BS the selection result of module, generation comprises the judged result of target BS judge module for the hand-off request of selected target BS in the described hand-off request, to notify judged result to selected target BS.
9. base station according to claim 8, wherein
Described switching command generation module produces the handoff command for described subscriber equipment according to the response for hand-off request from selected target BS, and described handoff command comprises the information that indicates whether to omit the RACH access procedure.
10. base station comprises:
The handover request judge module is used for judging according to the hand-off request from source base station whether described base station self is included in the coordinated multipoint transmission group of base stations of subscriber equipment; And
The switching request response generation module, be used for when described handover request judge module judges that described base station self is included in the coordinated multipoint transmission group of base stations of subscriber equipment, generation is for the hand-off request response of described source base station, comprise the information that the RACH access procedure is omitted in indication in the described hand-off request response, so that described subscriber equipment omits the RACH access procedure, directly send handover to described base station and finish message.
11. base station according to claim 10 also comprises:
The Link State evaluation module when being used for self being included in the coordinated multipoint transmission group of base stations of described subscriber equipment in described base station, is assessed current uplink synchronization state,
Wherein said switching request response generation module also produces hand-off request response for described source base station according to the assessment result of described Link State evaluation module.
12. a mobile communication system comprises:
Described subscriber equipment one of according to claim 1-3;
At least one is described base station one of according to claim 4-9, as source base station; And
At least one is described base station one of according to claim 10-11, as target BS.
13. a method of handover comprises step:
Source base station is selected the target BS of handover according to the channel measurement report from subscriber equipment according to predetermined base station shifting choice criteria;
Source base station judges according to the uplink coordinated multi-point transmission information for described subscriber equipment whether selected target BS is included in the coordinated multipoint transmission group of base stations of described subscriber equipment;
When selected target BS was included in the coordinated multipoint transmission group of base stations of described subscriber equipment, source base station produced for the indication that comprises of described subscriber equipment and omits the handoff command of RACH access procedure information; And
When described handoff command comprised that the information of RACH access procedure is omitted in indication, subscriber equipment omitted the RACH access procedure, directly sent handover to target BS and finished message.
14. method of handover according to claim 13, wherein said predetermined base station shifting choice criteria is:
Selection has to the base station of the optimal channel quality of described subscriber equipment, as described target BS.
15. according to claim 13 or 14 described method of handover, before producing described handoff command, described method of handover also comprises step:
Source base station produces the hand-off request for selected target BS, judged result is notified selected target BS in described hand-off request;
Described target BS is according to the hand-off request that comprises notice, generation is for the hand-off request response of described source base station, described hand-off request response comprises the information that indicates whether to omit the RACH access procedure, when selected target BS was included in the coordinated multipoint transmission group of base stations of described subscriber equipment, described hand-off request response comprised the information that the RACH access procedure is omitted in indication; And
Source base station produces for the handoff command that indicates whether to omit RACH access procedure information comprising of described subscriber equipment according to the hand-off request response that comprises the information that indicates whether to omit the RACH access procedure.
16. method of handover according to claim 15 also comprises step:
When selected target BS is included in the coordinated multipoint transmission group of base stations of described subscriber equipment, the current uplink synchronization state of described target BS assessment;
When current uplink synchronization state was good, target BS produced described hand-off request response, and described hand-off request response comprises the information that the RACH access procedure is omitted in indication; And
Source base station produces for the indication that comprises of described subscriber equipment and omits the handoff command of RACH access procedure information according to the hand-off request response of the information that comprises indication omission RACH access procedure.
17. according to claim 13 or 14 described method of handover, wherein
When selected target BS is not included in the coordinated multipoint transmission group of base stations of described subscriber equipment, described hand-off request response comprises the information that the RACH access procedure is not omitted in indication, handoff command comprises that indication do not omit RACH access procedure information, perhaps
Be included in the coordinated multipoint transmission group of base stations of described subscriber equipment but the response of described hand-off request comprises indication when not omitting the information of RACH access procedure at selected target BS, handoff command comprises that indication do not omit RACH access procedure information; And described method of handover also comprises step:
When handoff command comprised that RACH access procedure information is not omitted in indication, subscriber equipment carried out the RACH access procedure.
18. according to claim 13 or 14 described method of handover, wherein
If described subscriber equipment do not receive in the given time from described target BS handover is finished the response of message, then described subscriber equipment is carried out the RACH access procedure for described target BS.
19. according to claim 13 or 14 described method of handover, before producing described handoff command, described method of handover also comprises step:
When selected target BS is included in the coordinated multipoint transmission group of base stations of described subscriber equipment, the current uplink synchronization state of described source base station assessment;
When current uplink synchronization state was good, source base station produced for the indication that comprises of described subscriber equipment and omits the handoff command of RACH access procedure information.
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| CN102595529B (en) * | 2011-01-06 | 2014-12-10 | 中兴通讯股份有限公司 | Switching method and switching system based on multipoint coordination |
| CN102595640B (en) * | 2011-01-07 | 2015-06-03 | 中兴通讯股份有限公司 | Wireless link reconstruction method and system |
| CN102625383A (en) * | 2011-01-31 | 2012-08-01 | 华为技术有限公司 | Switching method during coordinated multi-point transmission/reception and node equipment |
| CN102685826B (en) * | 2011-03-17 | 2015-03-18 | 华为技术有限公司 | Switching processing method, device and system |
| CN102740385B (en) * | 2011-04-11 | 2016-08-10 | 华为技术有限公司 | Method and apparatus for community switching |
| CN103200629B (en) * | 2012-01-10 | 2016-08-03 | 华为技术有限公司 | Base station switch method, X2 interface method for building up, base station, user terminal and system |
| CN103368637A (en) * | 2012-03-30 | 2013-10-23 | 上海贝尔股份有限公司 | Signal processing method in multi-point coordination |
| EP2950587A4 (en) * | 2013-01-25 | 2016-07-27 | Fujitsu Ltd | Handover method based on uplink signal, method for configuring uplink signal, user equipment, and base station |
| CN104301883B (en) * | 2013-07-16 | 2018-01-16 | 电信科学技术研究院 | A kind of cooperative multipoint transmission control method and device in cell switch process |
| WO2017028897A1 (en) * | 2015-08-17 | 2017-02-23 | Telefonaktiebolaget Lm Ericsson (Publ) | Multi-cell registered radio connection in cellular network |
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