CN104349409A - Cell switching method and base station - Google Patents
Cell switching method and base station Download PDFInfo
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- CN104349409A CN104349409A CN201310327174.4A CN201310327174A CN104349409A CN 104349409 A CN104349409 A CN 104349409A CN 201310327174 A CN201310327174 A CN 201310327174A CN 104349409 A CN104349409 A CN 104349409A
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- 238000000034 method Methods 0.000 title claims abstract description 98
- 238000005259 measurement Methods 0.000 claims abstract description 79
- 230000008569 process Effects 0.000 claims abstract description 51
- 230000004048 modification Effects 0.000 claims description 42
- 238000012986 modification Methods 0.000 claims description 42
- 230000004044 response Effects 0.000 claims description 23
- 238000002360 preparation method Methods 0.000 claims description 21
- 230000008859 change Effects 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 description 5
- 230000001360 synchronised effect Effects 0.000 description 5
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- 238000005516 engineering process Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
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- 238000007599 discharging Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
- H04W36/304—Reselection being triggered by specific parameters by measured or perceived connection quality data due to measured or perceived resources with higher communication quality
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0061—Transmission or use of information for re-establishing the radio link of neighbour cell information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
- H04W36/0094—Definition of hand-off measurement parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
Abstract
The present invention discloses a cell switching method comprising: a source base station acquiring one or more candidate cells and successively sending a switching request message to a base station of the one or more candidate cells; after receiving a measurement report, the source base station determining a candidate cell with the highest priority as a target switching cell according to the measurement report, and after determining that the target switching cell is successfully prepared for switching, indicating a UE to switch to the target switching cell. The present invention also discloses a base station at the same time. The technical solutions of the present invention can reduce the switching delay caused during the cell switching process, reduce the risk of call drop for the UE during cell switching, increase the success rate for switching, ensure the continuity of services and improve user experiences.
Description
Technical field
The present invention relates to the communication technology, be specifically related to a kind of cell switching method and base station.
Background technology
Long Term Evolution (LTE, Long Term Evolution) system adopts network control, subscriber equipment (UE, User Equipment) auxiliary mode switches, and whole switching flow comprises switching preparation, switching performs and switching completes three phases.Concrete switching flow is as follows:
In handoff preparation phase, source evolved node B(eNB, evolved NodeB) send wireless heterogeneous networks (RRC to UE, Radio Resource Control) connect reallocation message, and receive the measurement report that UE returns, based on the channel quality information of the local area carried in measurement report and adjacent area, be specially Reference Signal Received Power (RSRP, Reference Signal Received Power) or Reference Signal Received Quality (RSRQ, Reference Signal Received Quality), and wireless resource management information carries out handover decisions, select final handover candidate cells list, optimum switching target small area is selected from candidate list, source eNB sends handover request to target eNB, and target eNB carries out call access control, for UE prepares switchable resource, replys switching request response to source eNB.
In handover execution stage, source eNB sends the switching command of target eNB generation to UE, and instruction UE switches to Target cell; Source eNB carries out up-downgoing data inverse-transmitting to target eNB.UE is successfully linked into Target cell and sets up uplink synchronous, sends to switch to confirm to target eNB, carries out switching and completes the stage.
Complete the stage in switching, core network element completes the conversion of downlink path, and target eNB sends according to the order of sequence to that front transmit and the new data received, and meanwhile, source eNB discharges the resource that UE takies.
In existing cell switching method, handover request can only carry a Target cell, if there is multiple candidate target cells, because switching flow can not transmitted in parallel, serial can only carry out, the duration of handoff preparation phase will be increased, and add the risk of UE call drop.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of cell switching method and base station, can reduce the handover delay brought in cell switch process, reduces the risk of UE call drop in cell merge, reduces the complexity of handoff procedure.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of cell switching method, described method comprises:
Source base station obtains one or more candidate cell, and the home base station successively to described one or more candidate cell sends handover request message;
After described source base station receives measurement report, according to the highest candidate cell of described measurement report determination priority as target handover cell, and determine that described target handover cell switches and prepares successfully, indicate UE to switch to described target handover cell.
In such scheme, described method also comprises:
When candidate cell is two or more, after described UE has switched, described source base station has indicated other candidate cells in described candidate cell except target handover cell to cancel switching.
In such scheme, the described candidate cell the highest according to described measurement report determination priority, as target handover cell, comprising:
The load of described candidate cell that described source base station carries according to described measurement report and the information of signal quality, select load the lightest and the candidate cell of signal quality optimum as target handover cell.
In such scheme, described successively to after the home base station of described one or more candidate cell sends handover request message, described method also comprises:
Described source base station receives after switching that all candidate cells return prepares response message, within the switching stand-by period, described source base station does not receive the measurement report that UE sends, or trigger described UE and switch, the target BS that described source base station instruction switches the ownership preparing successful candidate cell is cancelled and being switched.
In such scheme, described successively to after the home base station of described one or more candidate cell sends handover request message, described method also comprises:
Described source base station receives after switching that candidate cell returns prepares response message, within the switching stand-by period, determine that the contextual information of described UE changes, or UE carrying is when changing, the contextual information of described UE or UE carrying are processed, and the target BS that instruction switches the ownership of the successful candidate cell of preparation cancels switching, then send handover request message respectively to described one or more candidate cell, described one or more candidate cell is re-started and switches preparation.
In such scheme, described successively to after the home base station of described one or more candidate cell sends handover request message, described method also comprises:
Described source base station receives after switching that candidate cell returns prepares response message, within the switching stand-by period, determine that the contextual information of described UE changes, or UE carrying is when changing, the contextual information of described UE or UE carrying are processed, and carries out UE contextual modifications or UE bearing modification by the target BS that UE contextual modifications flow process or the instruction of UE bearing modification flow process switch the ownership preparing successful candidate cell.
Present invention also offers a kind of base station, described base station is source base station, and described base station comprises: acquisition module, sending module, receiver module, determination module and indicating module; Wherein,
Described acquisition module, for obtaining one or more candidate cell, sends to described determination module by the information of described one or more candidate cell;
Described sending module, sends handover request message for the home base station successively to described one or more candidate cell;
Described receiver module, for receiving measurement report, sends to described determination module by described measurement report;
Described determination module, for according to the highest candidate cell of described measurement report determination priority as target handover cell;
Described indicating module, prepare successfully for the described target handover cell switching determined at described determination module, instruction UE switches to described candidate cell.
In such scheme, described indicating module, also for when candidate cell is two or more, after UE has switched, has indicated other candidate cells in described candidate cell except target handover cell to cancel and has switched.
In such scheme, described determination module, for the load of described candidate cell that carries according to described measurement report and the information of signal quality, select load the lightest and the candidate cell of signal quality optimum as target handover cell.
In such scheme, described indicating module, also receive after switching that all candidate cells return prepares response message for described receiver module, within the switching stand-by period, if described receiver module does not receive measurement report, or trigger described UE and switch, then instruction switches the target BS handover cancelling of the ownership preparing successful candidate cell.
In such scheme, described base station also comprises context management module, within the switching stand-by period, when determining that the contextual information of described UE or UE carrying change, processes the contextual information of described UE or UE carrying;
Described indicating module, also for after the contextual information of UE described in described context management module process or UE have carried, the target BS that instruction switches the ownership preparing successful candidate cell is cancelled and being switched;
Described sending module, also for sending handover request message respectively to described one or more candidate cell, making described one or more candidate cell re-start and switching preparation.
In such scheme, described indicating module, also for after the contextual information of UE described in described context management module process or UE have carried, the target BS being switched the ownership preparing successful candidate cell by UE contextual modifications flow process or the instruction of UE bearing modification flow process carries out UE contextual modifications or UE bearing modification.
Cell switching method provided by the invention and base station, source base station obtains one or more candidate cell, and the home base station successively to described one or more candidate cell sends handover request message, after source base station receives measurement report, according to the highest candidate cell of described measurement report determination priority as target handover cell, and determine that described target handover cell switches and prepares successfully, indicate UE to switch to described target handover cell, so, source base station carries out handover preparation process in advance, perform switching immediately receiving measurement report, optimize whole switching flow, eliminate and switch time, thus reduce the time delay of whole switching flow, and by the one or more ownership target BS handovering request to one or more candidate cell of source base station transmitted in parallel, and select optimum candidate cell to switch, reduce the handover delay that can only be brought to multiple candidate cell transmission handover request by serial in prior art, reduce the risk of UE call drop in cell merge, improve handover success rate, ensure that the continuity of business, improve the experience of user, be particularly useful for the scene of the high-speed mobile such as high ferro or flight covering.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of cell switching method of the present invention;
Fig. 2 is the schematic flow sheet of the cell switching method of first embodiment of the invention;
Fig. 3 is the schematic flow sheet of the cell switching method of second embodiment of the invention;
Fig. 4 is the method flow schematic diagram of the source base station acquisition candidate cell of third embodiment of the invention;
Fig. 5 is the method flow schematic diagram of the source base station acquisition candidate cell of fourth embodiment of the invention;
Fig. 6 be the target handover cell of fifth embodiment of the invention switch prepares successfully but source base station does not receive measurement report time UE carry or process flow figure that context changes;
Fig. 7 be the target handover cell of sixth embodiment of the invention switch prepares successfully but source base station does not receive measurement report time UE carry or process flow figure that context changes;
Fig. 8 be the target handover cell of seventh embodiment of the invention switch prepares successfully but source base station does not receive measurement report time UE carry or process flow figure that context changes;
Fig. 9 be the target handover cell of eighth embodiment of the invention switch prepares successfully but source base station does not receive measurement report time UE carry or process flow figure that context changes;
Figure 10 is that the source base station of ninth embodiment of the invention switches the overtime process flow figure not receiving UE measurement report or do not trigger UE switching of waiting timer;
Figure 11 is that the source base station of tenth embodiment of the invention switches the overtime process flow figure not receiving UE measurement report or do not trigger UE switching of waiting timer;
Figure 12 is the composition structural representation of base station of the present invention.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is further detailed explanation.
Fig. 1 is the schematic flow sheet of cell switching method of the present invention, as shown in Figure 1, comprises the following steps:
Step 101: source base station obtains one or more candidate cell, the home base station successively to described one or more candidate cell sends handover request message.
Here, described source base station directly obtains one or more candidate cells of configuration by background net management, and the home base station transmission handover request message successively to described one or more candidate cell carries out switching preparation.
Preferably, described successively to after the home base station of described one or more candidate cell sends handover request message, described method also comprises:
Described source base station receives the switching preparation response message that all candidate cells return, and starts and switches waiting timer.
Step 102: after source base station receives measurement report, according to the highest candidate cell of described measurement report determination priority as target handover cell, and determining that the switching of described target handover cell prepares successfully, instruction UE switches to described target handover cell.
Here, source base station is receiving the measurement report of UE transmission within the switching stand-by period, the load of described candidate cell carried according to described measurement report and the information of signal quality, select load the lightest and the candidate cell of signal quality optimum as target handover cell.
Preferably, when candidate cell is two or more, after described UE has switched, described source base station has indicated other candidate cells in described candidate cell except target handover cell to cancel switching preparation.
Here, after described UE has switched, other target BS outside the target BS that described source base station belongs to described target handover cell send handover cancelling message and context release command, and to cancel the switching of described UE, and release other target BS described are the resource that described UE prepares.
Preferably, source base station is not receiving measurement report within the switching stand-by period, or triggers the switching of described UE, and the target BS that described source base station instruction switches the ownership preparing successful candidate cell is cancelled and being switched.
Preferably, described source base station receives after switching that candidate cell returns prepares response message, within the switching stand-by period, determine that the contextual information of described UE changes, or UE carrying is when changing, the contextual information of described UE or UE carrying are processed, and the target BS that instruction switches the ownership preparing successful candidate cell cancels switching, send handover request message respectively to described one or more candidate cell again, described one or more candidate cell is re-started and switches preparation.
Preferably, described source base station receives after switching that candidate cell returns prepares response message, within the switching stand-by period, determine that the contextual information of described UE changes, or UE carrying is when changing, the contextual information of described UE or UE carrying are processed, and carries out UE contextual modifications or UE bearing modification by the target BS that UE contextual modifications flow process or the instruction of UE bearing modification flow process switch the ownership preparing successful candidate cell.
Wherein, after described target BS carries out UE contextual modifications or the success of UE bearing modification, step 102 is performed; After described target BS carries out UE contextual modifications or the failure of UE bearing modification, the target BS that described source base station instruction switches the ownership preparing successful candidate cell is cancelled and being switched.
Fig. 2 is the schematic flow sheet of the cell switching method of first embodiment of the invention, and described first embodiment is the cell switching method based on S1 interface, as shown in Figure 2, comprises the following steps:
Step 201: source eNB is to UE sending measuring control message.
Here, source eNB connects reallocation message to UE sending measuring control message by RRC, carries measurement configuration parameter in described Survey control message, and UE performs measurement according to described measurement configuration parameter to execution object.
Step 202 ~ step 203: source eNB obtains candidate cell, sends handover request message to target eNB 1 to the target eNB N at described candidate cell place successively by mobile management entity (MME, Mobility Management Entity).
Here, source eNB can obtain all adjacent cells alternatively community of this cell configuration from the neighbor cell configuration module of webmaster, the candidate cell obtained may belong to different target eNB, assuming that candidate cell belongs to target eNB 1 to target eNB N in the embodiment of the present invention, therefore, handover request message 1 to handover request message N is sent to target eNB 1 to target eNB N by MME by source eNB successively.
Step 204: target eNB 1 to target eNB N returns handoff request acknowledgment message to MME.
Here, described target eNB 1 to target eNB N returns handoff request acknowledgment message 1 to handoff request acknowledgment message N to MME after executing and switching preparation successively.
Step 205:MME returns the switching command message of target eNB successively to source eNB.
Here, MME returns switching command message 1 to the switching command message N of target eNB 1 to target eNB N successively to source eNB.
Step 206 ~ step 207: source eNB receives the measurement report that UE sends, according to priority selects one to switch the successful candidate cell of preparation according to the candidate cell information in described measurement report and performs switching.
Here, source eNB starts and switches waiting timer, within the switching stand-by period, source eNB receives the measurement report that UE sends, candidate cell according to the Selecting parameter optimum such as load and signal quality of the candidate cell in described measurement report performs switching as Target cell, supposes that the home base station of described Target cell is target eNB 1 in the present embodiment.
Step 208: source eNB sends switching command to UE.
Here, described source eNB sends switching command by RRC connection reallocation message to UE.
Step 209: carry out context data anti-pass between source eNB and object eNB.
Here, the context data of described UE is sent to target eNB 1 by source eNB, and context data is sent to UE by air interface by target eNB 1, to make UE when switching cell, can be synchronized to target handover cell.
Step 210:UE sends switch acknowledgment message to target eNB.
Here, UE is synchronized to Target cell by Stochastic accessing, completes message carry switch acknowledgment message by RRC connection reprovision.
Step 211: target eNB returns handoff notification message to MME.
Here, target eNB 1 returns handoff notification message to MME.
Step 212 ~ step 213:MME sends UE context release command message to source eNB, receives the UE context Release complete that source eNB returns.
Here, MME sends UE context release command message with the resource of source of release eNB side and context data etc. to source eNB, and after release completes, returns UE context Release complete to MME.
Step 214: source eNB sends handover cancelling message to MME.
Here, source eNB stops switching waiting timer, and send handover cancelling message successively to MME, described handover cancelling message is the handover cancelling message of target eNB 2 to target eNB N; If wherein having target eNB to switch prepares unsuccessfully, then do not send the handover cancelling message of corresponding target eNB.
Step 215 ~ step 216:MME sends UE context release command message to target eNB 2 to target eNB N successively; And the UE context Release complete that receiving target eNB2 to target eNB N returns.
Here, owing to determining that target eNB 1 is the home base station of target handover cell, then do not need all the other target BS, namely target eNB 2 to target eNB N does any operation, therefore, MME sends UE context release command message to target eNB 2 to target eNB N successively, for discharging the resource of target eNB side and context data etc., and after release completes, return UE context Release complete to MME.
Step 217:MME sends the handover cancelling response message of target eNB 2 to target eNB N successively to source eNB, complete cell merge.
Fig. 3 is the schematic flow sheet of the cell switching method of second embodiment of the invention, and described second embodiment is the cell switching method based on X2 interface, as shown in Figure 3, comprises the following steps:
Step 301: source eNB is to UE sending measuring control message.
Here, source eNB connects reallocation message to UE sending measuring control message by RRC, carries measurement configuration parameter in described Survey control message, and UE performs measurement according to described measurement configuration parameter to execution object.
Step 302 ~ step 303: source eNB obtains candidate cell, the target eNB belonged to described candidate cell successively sends handover request message, and receives the handoff request acknowledgment message that described target eNB returns successively.
Here, source eNB can obtain all adjacent cells of this cell configuration from the neighbor cell configuration module of webmaster, the candidate cell obtained may have multiple, and described multiple candidate cell may belong to different target eNB, suppose that in the embodiment of the present invention, candidate cell belongs to target eNB 1 to target eNB N, therefore, source eNB sends handover request message 1 to handover request message N to target eNB 1 to target eNB N successively, and receives handoff request acknowledgment message 1 to the handoff request acknowledgment message N that described target eNB 1 to target eNB N returns successively.
Step 304 ~ step 305: source eNB receives the measurement report that UE sends, and according to priority select a successful candidate cell of switching preparation to perform switching according to the candidate cell information in described measurement report.
Here, source eNB starts and switches waiting timer, within the switching stand-by period, after receiving the measurement report that UE reports, candidate cell according to the Selecting parameter optimum such as load and signal quality of the candidate cell in described measurement report performs switching as Target cell, supposes that described Target cell is the adjacent cell of target eNB 1 in the present embodiment.
Step 306: source eNB sends switching command to UE.
Here, described source eNB sends switching command by RRC connection reallocation message to UE.
Step 307: carry out context data anti-pass between source eNB and object eNB.
Here, the context data of described UE is sent to target eNB 1 by source eNB, and context data is sent to UE by air interface by target eNB 1, to make UE when switching cell, can be synchronized to target handover cell.
Step 308:UE sends switch acknowledgment message to target eNB.
Here, UE is synchronized to Target cell by Stochastic accessing, completes message carry switch acknowledgment message by RRC connection reprovision.
Step 309 ~ step 310: target eNB to MME transmit path transition request message, and receives the path integration request-reply message that MME returns.
Step 311: target eNB sends context resource release command message to source eNB.
Here, target eNB 1 sends UE context release command message with the resource of source of release eNB side and context data etc. to source eNB.
Step 312: source eNB sends handover cancelling message to target eNB 2 to target eNB N, completes cell merge.
Here, source eNB stops switching waiting timer, owing to determining that target eNB 1 is the home base station of target handover cell, then do not need the switchable resource of all the other target BS, therefore, source eNB sends handover cancelling message to target eNB 2 to target eNB N, prepares unsuccessfully, then do not send the handover cancelling message of corresponding target eNB if wherein there is target eNB to switch.
The embodiment of the present invention additionally provides the method that several source base station obtains candidate cell, the first method obtaining candidate cell is as described above, source eNB can obtain all adjacent cells of this cell configuration from the neighbor cell configuration module of webmaster, except the above-mentioned method provided, the embodiment of the present invention also describes a kind of method that source base station obtains candidate cell, Fig. 4 is the method flow schematic diagram of the source base station acquisition candidate cell of third embodiment of the invention, as shown in Figure 4, comprises the following steps:
Step 401: source eNB obtains the adjacent cell of this cell configuration from the neighbor cell configuration module of webmaster, is designated as configuration adjacent cell collection.
Step 402: source eNB obtains the history handover information of certain hour Nei Zhe community, obtains all adjacent cells cut out according to history handover information, is designated as and cuts out adjacent cell collection.
Here, the history handover information that described source eNB obtains certain hour Nei Zhe community comprises within a certain period of time, the history handover information of all UE of this community, and the history handover information according to all UE obtains all adjacent cells cut out.
Step 403: source eNB obtains configuration adjacent cell collection and the common factor alternatively community cutting out adjacent cell collection.
Fig. 5 is the method flow schematic diagram of the source base station acquisition candidate cell of fourth embodiment of the invention, as shown in Figure 5, comprises the following steps:
Step 501: source eNB obtains the adjacent cell of this cell configuration from the neighbor cell configuration module of webmaster, is designated as configuration adjacent cell collection.
Step 502: source eNB obtains the history handover information of certain hour NeiUEZhe community, obtains all adjacent cells cut out according to history handover information, is designated as and cuts out adjacent cell collection.
Here, the history handover information that described source eNB obtains certain hour NeiUEZhe community only comprises within a certain period of time, and current UE, at the history handover information of this community, obtains all adjacent cells cut out according to the history handover information of current UE in this community.
Step 503: source eNB gets configuration adjacent cell collection and the common factor alternatively community cutting out adjacent cell collection.
Fig. 6 be the target handover cell of fifth embodiment of the invention switch prepare successfully but source base station does not receive measurement report time UE carry the process flow figure changed, as shown in Figure 6, the present embodiment is the process flow based on S1 interface, comprises the following steps:
Step 601: source eNB is to UE sending measuring control message.
Here, source eNB connects reallocation message to UE sending measuring control message by RRC, carries measurement configuration parameter in described Survey control message, and UE performs measurement according to described measurement configuration parameter to execution object.
Step 602 ~ step 603: source eNB obtains candidate cell, sends handover request message to target eNB 1 to the target eNB N at described candidate cell place successively by mobile management entity MME.
Here, source eNB can obtain all adjacent cells alternatively community of this cell configuration from the neighbor cell configuration module of webmaster, the candidate cell obtained may belong to different target eNB, assuming that candidate cell belongs to and target eNB 1 to target eNB N in the embodiment of the present invention, therefore, handover request message 1 to handover request message N is sent to target eNB 1 to target eNB N by MME by source eNB successively.
Step 604: target eNB 1 to target eNB N returns handoff request acknowledgment message to MME.
Here, described target eNB 1 to target eNB N returns handoff request acknowledgment message 1 to handoff request acknowledgment message N to MME after executing and switching preparation successively.
Step 605:MME returns the switching command message of target eNB successively to source eNB.
Here, MME returns switching command message 1 to the switching command message N of target eNB 1 to target eNB N successively to source eNB.
Step 606:, source eNB finds UE carrying change, processes described UE and carries change, and described UE carries change and comprises: carrying foundation, deleting load-bearing, bearing modification etc.
Step 607: source eNB sends the handover cancelling message of corresponding target eNB successively to MME.
Here, after UE carries change process, source eNB sends the handover cancelling message of target BS to MME, and described handover cancelling message is followed successively by handover cancelling message 1 to the handover cancelling message N of target eNB 1 to target eNB N.
Step 608 ~ step 609:MME sends UE context release command message to target eNB successively, and the UE context Release complete that returns of receiving target eNB successively.
Here, MME sends UE context release command message 1 to UE context release command message N to discharge the resource of target eNB side and context data etc. to target eNB 1 to target eNB N successively, and after release completes, return UE context Release complete 1 to the UE context Release complete N of target eNB 1 to target eNB N successively to MME.
Step 610:MME returns the handover cancelling response of target eNB 1 to target eNB N successively to source eNB.
Here, after described MME returns handover cancelling response message 1 to the handover cancelling response message N of target eNB 1 to target eNB N successively to source eNB, re-start to switch and prepare, re-execute second embodiment of the invention and cell switching method based on S1 interface is provided, namely the step 202 in Fig. 2 to step 217, to complete the cell merge of UE.
Fig. 7 be the target handover cell of sixth embodiment of the invention switch prepare successfully but source base station does not receive measurement report time UE carry the process flow figure changed, as shown in Figure 6, the present embodiment is the process flow based on X2 interface, comprises the following steps:
Step 701: source eNB is to UE sending measuring control message.
Here, source eNB connects reallocation message to UE sending measuring control message by RRC, carries measurement configuration parameter in described Survey control message, and UE performs measurement according to described measurement configuration parameter to execution object.
Step 702 ~ step 703: source eNB obtains candidate cell, the target eNB belonged to described candidate cell successively sends handover request message, and receives the handoff request acknowledgment message that described target eNB returns successively.
Here, source eNB can obtain all adjacent cells of this cell configuration from the neighbor cell configuration module of webmaster, the candidate cell obtained may have multiple, and described multiple candidate cell may belong to different target eNB, suppose that in the embodiment of the present invention, candidate cell belongs to target eNB 1 to target eNB N, therefore, source eNB sends handover request message 1 to handover request message N to target eNB 1 to target eNB N successively, and receives handoff request acknowledgment message 1 to the handoff request acknowledgment message N that described target eNB 1 to target eNB N returns successively.
Step 704: source eNB finds UE carrying change, processes described UE and carries change, and described UE carries change and comprises: carrying foundation, deleting load-bearing, bearing modification etc.
Step 705: source eNB sends the handover cancelling message of corresponding target eNB successively to MME.
Here, after UE carries change process, source eNB sends the handover cancelling message of target BS to MME, and described handover cancelling message is followed successively by the handover cancelling message N of handover cancelling message 1 to the target eNB N of target eNB 1;
Further, after source eNB completes to the handover cancelling message that MME sends corresponding target eNB successively, re-start to switch and prepare, re-execute the cell switching method based on X2 interface that third embodiment of the invention provides, the step 302 in Fig. 3 is to step 312.
Fig. 8 be the target handover cell of seventh embodiment of the invention switch prepares successfully but source base station does not receive measurement report time UE carry or process flow figure that context changes, as shown in Figure 8, the present embodiment is the process flow based on X2 interface, comprises the following steps:
Step 801: source eNB sends UE context modification request message to target eNB.
Here, described UE context modification request carries Old eNB UE X2AP ID mark, New eNB UE X2AP ID identifies, Aggregate Maximum Bit Rate (AMBR, Aggregate Maximum Bit Rate), safe key, UE security capabilities, wireless access technology/frequency priority subscriber's section mark (SPID, Service Profile Identifiers) etc.
Step 802a: if the success of target eNB process UE contextual modifications, target eNB replys UE contextual modifications response message to source eNB.
Here, described UE contextual modifications response message carries Old eNB UE X2AP ID mark, New eNB UE X2AP ID mark etc.
Further, when after described target eNB process UE contextual modifications success, continue to perform step 304 in Fig. 3 and, to step 312, complete the switching of Target cell, repeat no more herein.
Step 802b: if the failure of target eNB process UE contextual modifications, target eNB replys UE contextual modifications failed message to source eNB.
Here, described UE contextual modifications failed message carries Old eNB UE X2AP ID mark, New eNB UE X2AP ID mark and failure cause etc.
Here, when after described target eNB process UE contextual modifications failure, source eNB sends handover cancelling message to target eNB, and instruction switches the target BS handover cancelling of the ownership preparing successful candidate cell.
Fig. 9 be the target handover cell of eighth embodiment of the invention switch prepares successfully but source base station does not receive measurement report time UE carry or process flow figure that context changes, as shown in Figure 9, the present embodiment is the process flow based on X2 interface, comprises the following steps:
Step 901: source eNB sends the Universal Terrestrial wireless access network RAB modify request messages of evolution to target eNB.
Here, Old eNB UE X2AP ID mark, New eNB UE X2AP ID mark, AMBR, the E-RAB list of amendment and the mark of each E-RAB and QoS parameter etc. are carried in the Universal Terrestrial wireless access network RAB amendment request of described evolution.
Step 902: after the Universal Terrestrial wireless access network RAB amendment request of target eNB process evolution, replys the Universal Terrestrial wireless access network RAB amendment response message of evolution to source eNB.
Here, the Universal Terrestrial wireless access network RAB amendment response message of described evolution carries Old eNB UE X2AP ID mark, New eNB UE X2AP ID mark, successfully modified E-RAB list, if and have the failed E-RAB of amendment, then can also carry and revise failed E-RAB list etc.
Further, when after described target eNB process UE contextual modifications success, continue to perform step 304 in Fig. 3 and, to step 312, complete the switching of Target cell, repeat no more herein; When after described target eNB process UE contextual modifications failure, source eNB sends handover cancelling message to target eNB, and instruction switches the target BS handover cancelling of the ownership preparing successful candidate cell.
Figure 10 is that the source base station of ninth embodiment of the invention switches the overtime process flow figure not receiving UE measurement report or do not trigger UE switching of waiting timer, and as shown in Figure 10, the present embodiment is the process flow based on S1 interface, comprises the following steps:
Step 1001: source eNB is to UE sending measuring control message.
Here, source eNB connects reallocation message to UE sending measuring control message by RRC, carries measurement configuration parameter in described Survey control message, and UE performs measurement according to described measurement configuration parameter to execution object.
Step 1002 ~ step 1003: source eNB obtains candidate cell, sends handover request message to target eNB 1 to the target eNB N at described candidate cell place successively by mobile management entity MME.
Here, source eNB can obtain all adjacent cells alternatively community of this cell configuration from the neighbor cell configuration module of webmaster, the candidate cell obtained may belong to different target eNB, assuming that candidate cell belongs to and target eNB 1 to target eNB N in the embodiment of the present invention, therefore, handover request message 1 to handover request message N is sent to target eNB 1 to target eNB N by MME by source eNB successively.
Step 1004: target eNB 1 to target eNB N returns handoff request acknowledgment message to MME.
Here, described target eNB 1 to target eNB N returns handoff request acknowledgment message 1 to handoff request acknowledgment message N to MME after executing and switching preparation successively.
Step 1005:MME returns the switching command message of target eNB successively to source eNB.
Here, MME returns switching command message 1 to the switching command message N of target eNB 1 to target eNB N successively to source eNB.
Step 1006 ~ step 1007: source eNB switches waiting timer time-out and do not receive UE measurement report or do not trigger UE switching, then send the handover cancelling message of corresponding target eNB successively to MME.
Here, source eNB does not receive the measurement report of UE transmission or does not trigger UE switching within the switching stand-by period, then send the handover cancelling message of target BS to MME, described handover cancelling message is followed successively by handover cancelling message 1 to the handover cancelling message N of target eNB 1 to target eNB N.
Step 1008 ~ step 1009:MME sends UE context release command message to target eNB 1 to target eNB N successively, and the UE context Release complete that returns of receiving target eNB1 to target eNB N successively.
Here, MME sends UE context release command message to discharge the resource of target eNB side and context data etc. to target eNB 1 to target eNB N successively, and after release completes, returns UE context Release complete to MME.
Step 1010:MME returns handover cancelling response message 1 to the handover cancelling response message N of target eNB 1 to target eNB N successively to source eNB.
Figure 11 is that the source base station of tenth embodiment of the invention switches the overtime process flow figure not receiving UE measurement report or do not trigger UE switching of waiting timer, and as shown in figure 11, the present embodiment is the handling process based on X2 interface, comprises the following steps:
Step 1101: source eNB is to UE sending measuring control message.
Here, source eNB connects reallocation message to UE sending measuring control message by RRC, carries measurement configuration parameter in described Survey control message, and UE performs measurement according to described measurement configuration parameter to execution object.
Step 1102 ~ step 1103: source eNB obtains candidate cell, the target eNB belonged to described candidate cell successively sends handover request message, and receives the handoff request acknowledgment message that described target eNB returns successively.
Here, source eNB can obtain all adjacent cells alternatively community of this cell configuration from the neighbor cell configuration module of webmaster, the candidate cell obtained may belong to different target eNB, assuming that candidate cell belongs to and target eNB 1 to target eNB N in the embodiment of the present invention, therefore, handover request message 1 to handover request message N is sent to target eNB 1 to target eNB N by MME by source eNB successively, and receives handoff request acknowledgment message 1 to the handoff request acknowledgment message N that described target eNB 1 to target eNB N returns successively.
Step 1104 ~ step 1105: source eNB switches waiting timer time-out and do not receive UE measurement report or do not trigger UE switching, then send handover cancelling message 1 to handover cancelling message N successively to target eNB 1 to target eNB N.
Here, source eNB does not receive the measurement report of UE transmission or does not trigger UE switching within the switching stand-by period, then send handover cancelling message 1 to handover cancelling message N successively to target eNB 1 to target eNB N, prepares with the switching cancelling target BS side.
Based on said method, the present invention also describes a kind of base station, and described base station is as source base station, and as shown in figure 12, described source base station comprises: acquisition module 1201, sending module 1202, receiver module 1203, determination module 1204 and indicating module 1205; Wherein,
Described acquisition module 1201, for obtaining one or more candidate cell, sends to described determination module 1204 by the information of described one or more candidate cell;
Described sending module 1202, sends handover request message for the home base station successively to described one or more candidate cell;
Described receiver module 1203, for receiving measurement report, sends to described determination module 1204 by described measurement report;
Described determination module 1204, for according to the highest candidate cell of described measurement report determination priority as target handover cell;
Described indicating module 1205, prepare successfully for the described target handover cell switching determined at described determination module 1204, instruction UE switches to described candidate cell.
Here, described acquisition module 1201 directly obtains one or more candidate cells of configuration by base station background net management, and concrete acquisition methods can method as described in Fig. 4 and Fig. 5, is not repeating herein.
Preferably, described indicating module 1205, also for when candidate cell is two or more, after UE has switched, has indicated other candidate cells in described candidate cell except target handover cell to cancel and has switched preparation.
Here, after described UE has switched, other target BS outside the target BS that described indicating module 1205 belongs to described target handover cell send handover cancelling message and context release command, to cancel the switching of described UE, and release other target BS described are the resource that described UE prepares.
Preferably, described determination module 1204, for the load of described candidate cell that carries according to described measurement report and the information of signal quality, select load the lightest and the candidate cell of signal quality optimum as target handover cell.
Preferably, described indicating module 1205, also receive after switching that all candidate cells return prepares response message for described receiver module 1203, within the switching stand-by period, if described receiver module 1203 does not receive measurement report, or trigger described UE and switch, then instruction switches the target BS handover cancelling of the ownership preparing successful candidate cell.
Preferably, described base station also comprises context management module 1206, within the switching stand-by period, when determining that the contextual information of described UE or UE carrying change, processes the contextual information of described UE or UE carrying;
Described indicating module 1205, also for after described context management module 1206 processes the contextual information of described UE or UE has carried, the target BS that instruction switches the ownership preparing successful candidate cell cancels switching;
Described sending module 1202, also for sending handover request message respectively to described one or more candidate cell, making described one or more candidate cell re-start and switching preparation.
Preferably, described indicating module 1205, also for after described context management module 1206 processes the contextual information of described UE or UE has carried, the target BS being switched the ownership preparing successful candidate cell by UE contextual modifications flow process or the instruction of UE bearing modification flow process carries out UE contextual modifications or UE bearing modification.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.All any amendments done within the spirit and scope of the present invention, equivalent and improvement etc., be all included within protection scope of the present invention.
Claims (12)
1. a cell switching method, is characterized in that, described method comprises:
Source base station obtains one or more candidate cell, and the home base station successively to described one or more candidate cell sends handover request message;
After described source base station receives measurement report, according to the highest candidate cell of described measurement report determination priority as target handover cell, and determining that the switching of described target handover cell prepares successfully, equipment for indicating user UE switches to described target handover cell.
2. method according to claim 1, is characterized in that, described method also comprises:
When candidate cell is two or more, after described UE has switched, described source base station has indicated other candidate cells in described candidate cell except target handover cell to cancel switching.
3. method according to claim 1, is characterized in that, the described candidate cell the highest according to described measurement report determination priority, as target handover cell, comprising:
The load of described candidate cell that described source base station carries according to described measurement report and the information of signal quality, select load the lightest and the candidate cell of signal quality optimum as target handover cell.
4. method according to claim 1, is characterized in that, described successively to after the home base station of described one or more candidate cell sends handover request message, described method also comprises:
Described source base station receives after switching that all candidate cells return prepares response message, within the switching stand-by period, described source base station does not receive the measurement report that UE sends, or trigger described UE and switch, the target BS that described source base station instruction switches the ownership preparing successful candidate cell is cancelled and being switched.
5. method according to claim 1, is characterized in that, described successively to after the home base station of described one or more candidate cell sends handover request message, described method also comprises:
Described source base station receives after switching that candidate cell returns prepares response message, within the switching stand-by period, determine that the contextual information of described UE changes, or UE carrying is when changing, the contextual information of described UE or UE carrying are processed, and the target BS that instruction switches the ownership of the successful candidate cell of preparation cancels switching, then send handover request message respectively to described one or more candidate cell, described one or more candidate cell is re-started and switches preparation.
6. method according to claim 1, is characterized in that, described successively to after the home base station of described one or more candidate cell sends handover request message, described method also comprises:
Described source base station receives after switching that candidate cell returns prepares response message, within the switching stand-by period, determine that the contextual information of described UE changes, or UE carrying is when changing, the contextual information of described UE or UE carrying are processed, and carries out UE contextual modifications or UE bearing modification by the target BS that UE contextual modifications flow process or the instruction of UE bearing modification flow process switch the ownership preparing successful candidate cell.
7. a base station, described base station is source base station, it is characterized in that, described base station comprises: acquisition module, sending module, receiver module, determination module and indicating module; Wherein,
Described acquisition module, for obtaining one or more candidate cell, sends to described determination module by the information of described one or more candidate cell;
Described sending module, sends handover request message for the home base station successively to described one or more candidate cell;
Described receiver module, for receiving measurement report, sends to described determination module by described measurement report;
Described determination module, for according to the highest candidate cell of described measurement report determination priority as target handover cell;
Described indicating module, prepare successfully for the described target handover cell switching determined at described determination module, instruction UE switches to described candidate cell.
8. base station according to claim 7, is characterized in that, described indicating module, also for when candidate cell is two or more, after UE has switched, has indicated other candidate cells in described candidate cell except target handover cell to cancel and switches.
9. base station according to claim 7, it is characterized in that, described determination module, for the load of described candidate cell that carries according to described measurement report and the information of signal quality, select load the lightest and the candidate cell of signal quality optimum as target handover cell.
10. base station according to claim 7, it is characterized in that, described indicating module, also receive after switching that all candidate cells return prepares response message for described receiver module, within the switching stand-by period, if described receiver module does not receive measurement report, or trigger described UE and switch, then instruction switches the target BS handover cancelling of the ownership preparing successful candidate cell.
11. base stations according to claim 7, it is characterized in that, described base station also comprises context management module, within the switching stand-by period, when determining that the contextual information of described UE or UE carrying change, the contextual information of described UE or UE carrying are processed;
Described indicating module, also for after the contextual information of UE described in described context management module process or UE have carried, the target BS that instruction switches the ownership preparing successful candidate cell is cancelled and being switched;
Described sending module, also for sending handover request message respectively to described one or more candidate cell, making described one or more candidate cell re-start and switching preparation.
12. base stations according to claim 7, is characterized in that,
Described indicating module, also for after the contextual information of UE described in described context management module process or UE have carried, the target BS being switched the ownership preparing successful candidate cell by UE contextual modifications flow process or the instruction of UE bearing modification flow process carries out UE contextual modifications or UE bearing modification.
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| WO2014169880A1 (en) | 2014-10-23 |
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