CN104349409B - A kind of cell switching method and base station - Google Patents

A kind of cell switching method and base station Download PDF

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Publication number
CN104349409B
CN104349409B CN201310327174.4A CN201310327174A CN104349409B CN 104349409 B CN104349409 B CN 104349409B CN 201310327174 A CN201310327174 A CN 201310327174A CN 104349409 B CN104349409 B CN 104349409B
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handover
cell
base station
target
candidate
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CN104349409A (en
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章正权
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ZTE Corp
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ZTE Corp
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Priority to PCT/CN2014/078639 priority patent/WO2014169880A1/en
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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
    • 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
    • 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
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a kind of cell switching methods successively to send switching request message to the home base station of one or more of candidate cells this method comprises: source base station obtains one or more candidate cells；After source base station receives measurement report, determine that the candidate cell of highest priority as target handover cell, and after determining that the target handover cell switching prepares successfully, indicates that UE is switched over to the target handover cell according to the measurement report.The present invention also discloses a kind of base stations.Using technical solution of the present invention, bring handover delay in cell switch process can reduce, reduce the risk of UE call drop in cell switching, improve handover success rate, ensure that the continuity of business, improve the experience of user.

Description

Cell switching method and base station
Technical Field
The present invention relates to communication technologies, and in particular, to a cell switching method and a base station.
Background
The Long Term Evolution (LTE) system performs handover in a network control and User Equipment (UE) assisted manner, and the whole handover process includes three stages of handover preparation, handover execution, and handover completion. The specific switching process is as follows:
in a handover preparation phase, a source evolved node B (eNB) sends a Radio Resource Control (RRC) connection reconfiguration message to UE, receives a measurement report returned by the UE, performs a handover decision based on channel Quality information of a local region and an adjacent region carried in the measurement report, specifically Reference Signal Received Power (RSRP) or Reference Signal Received Quality (RSRQ) and Radio Resource management information, selects a final handover candidate cell list, selects an optimal handover target cell from the candidate cell list, sends a handover request to a target eNB, performs admission Control on the target eNB, prepares handover resources for the UE, and replies a handover request response to the source eNB.
In the switching execution stage, the source eNB sends a switching command generated by the target eNB to the UE to indicate the UE to switch to the target cell; and the source eNB carries out uplink and downlink data back transmission to the target eNB. And the UE successfully accesses the target cell and establishes uplink synchronization, and sends a switching confirmation to the target eNB to carry out a switching completion stage.
In the switching completion phase, the core network element completes the conversion of the downlink path, the target eNB sends the data which is transmitted in advance and newly received in sequence, and meanwhile, the source eNB releases the resources occupied by the UE.
In the existing cell switching method, the switching request can only carry one target cell, if a plurality of candidate target cells exist, because the switching process can not be sent in parallel, and can only be carried out in series, the time length of the switching preparation stage is increased, and the risk of UE call drop is increased.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a cell handover method and a base station, which can reduce handover delay caused in a cell handover process, reduce a risk of UE call drop in the cell handover, and reduce complexity of the handover process.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention provides a cell switching method, which comprises the following steps:
a source base station acquires one or more candidate cells and sequentially sends a switching request message to a home base station of the one or more candidate cells;
and after receiving the measurement report, the source base station determines a candidate cell with the highest priority as a target switching cell according to the measurement report, and indicates the UE to switch to the target switching cell after determining that the target switching cell is successfully prepared.
In the above scheme, the method further comprises:
when the number of the candidate cells is more than two, the source base station indicates other candidate cells except the target switching cell in the candidate cells to cancel the switching after the UE switching is completed.
In the foregoing solution, the determining, according to the measurement report, the candidate cell with the highest priority as the target handover cell includes:
and the source base station selects the candidate cell with the lightest load and the optimal signal quality as the target switching cell according to the information of the load and the signal quality of the candidate cell carried by the measurement report.
In the foregoing solution, after the sequentially sending the handover request message to the home base station of the one or more candidate cells, the method further includes:
after receiving the switching preparation response messages returned by all candidate cells, the source base station does not receive a measurement report sent by UE (user equipment) or triggers the UE to switch within the switching waiting time, and the source base station indicates the target base station to which the candidate cell which is successfully prepared for switching belongs to cancel the switching.
In the foregoing solution, after the sequentially sending the handover request message to the home base station of the one or more candidate cells, the method further includes:
after receiving a handover preparation response message returned by the candidate cell, the source base station processes the context information or the UE bearer of the UE when determining that the context information of the UE changes or the UE bearer changes within the handover waiting time, indicates the target base station to which the candidate cell successfully prepared for handover belongs to cancel the handover, and then respectively sends a handover request message to the one or more candidate cells to enable the one or more candidate cells to perform handover preparation again.
In the foregoing solution, after the sequentially sending the handover request message to the home base station of the one or more candidate cells, the method further includes:
and after receiving a switching preparation response message returned by the candidate cell, the source base station processes the context information or the UE bearer of the UE when determining that the context information or the UE bearer of the UE changes within the switching waiting time, and indicates a target base station belonging to the candidate cell with successful switching preparation to modify the context or the UE bearer of the UE through a UE context modification process or a UE bearer modification process.
The present invention also provides a base station, wherein the base station is a source base station, and the base station comprises: the device comprises an acquisition module, a sending module, a receiving module, a determining module and an indicating module; wherein,
the acquiring module is configured to acquire one or more candidate cells and send information of the one or more candidate cells to the determining module;
the sending module is configured to send a handover request message to the home base station of the one or more candidate cells in sequence;
the receiving module is used for receiving a measurement report and sending the measurement report to the determining module;
the determining module is configured to determine, according to the measurement report, a candidate cell with a highest priority as a target handover cell;
the indicating module is configured to indicate the UE to perform handover to the candidate cell after the target handover cell determined by the determining module is successfully prepared for handover.
In the foregoing solution, the indicating module is further configured to indicate, when the number of candidate cells is more than two, other candidate cells except the target handover cell in the candidate cells to cancel handover after the UE handover is completed.
In the foregoing solution, the determining module is configured to select, according to the information about the load and the signal quality of the candidate cell carried by the measurement report, the candidate cell with the lightest load and the optimal signal quality as the target handover cell.
In the foregoing solution, the indicating module is further configured to, after the receiving module receives the handover preparation response messages returned by all candidate cells, within the handover waiting time, if the receiving module does not receive the measurement report or does not trigger the UE handover, indicate that the handover preparation is cancelled from the target base station to which the candidate cell belongs.
In the above solution, the base station further includes a context management module, configured to process the context information of the UE or the UE bearer when it is determined that the context information of the UE or the UE bearer changes within the handover waiting time;
the indicating module is further configured to indicate the target base station to which the candidate cell is assigned for successful handover preparation to cancel the handover after the context management module processes the context information of the UE or the UE bearer is completed;
the sending module is further configured to send a handover request message to the one or more candidate cells, respectively, so that the one or more candidate cells perform handover preparation again.
In the foregoing solution, the indicating module is further configured to indicate, through a UE context modification procedure or a UE bearer modification procedure, a target base station to which the candidate cell that is successfully prepared for handover belongs to perform the UE context modification or the UE bearer modification after the context management module processes the context information of the UE or the UE bearer is completed.
In the cell switching method and the base station provided by the invention, the source base station acquires one or more candidate cells and sequentially sends a switching request message to the home base station of the one or more candidate cells; after receiving the measurement report, the source base station determines a candidate cell with the highest priority as a target switching cell according to the measurement report, and indicates the UE to switch to the target switching cell after determining that the target switching cell is successfully prepared; therefore, the source base station carries out switching preparation processing in advance, switching is immediately executed after a measurement report is received, the whole switching process is optimized, and the switching preparation time is saved, so that the time delay of the whole switching process is reduced, one or more switching requests are sent to the attributive target base station of one or more candidate cells in parallel through the source base station, the optimal candidate cell is selected for switching, the switching time delay caused by the fact that the switching requests can only be sent to the candidate cells in series in the prior art is reduced, the risk of UE call drop in cell switching is reduced, the switching success rate is improved, the continuity of services is guaranteed, the user experience is improved, and the method and the device are particularly suitable for high-speed moving scenes such as high-speed rail or flight coverage.
Drawings
FIG. 1 is a flow chart illustrating a cell switching method according to the present invention;
fig. 2 is a flowchart illustrating a cell switching method according to a first embodiment of the present invention;
fig. 3 is a flowchart illustrating a cell switching method according to a second embodiment of the present invention;
fig. 4 is a flowchart illustrating a method for a source base station to acquire a candidate cell according to a third embodiment of the present invention;
fig. 5 is a flowchart illustrating a method for a source base station to acquire a candidate cell according to a fourth embodiment of the present invention;
fig. 6 is a flowchart of a processing method for UE bearer or context change when handover preparation of a target handover cell is successful but a measurement report is not received by a source base station according to a fifth embodiment of the present invention;
fig. 7 is a flowchart of a processing method for UE bearer or context change when handover preparation of a target handover cell is successful but a measurement report is not received by a source base station according to a sixth embodiment of the present invention;
fig. 8 is a flowchart of a processing method for UE bearer or context change when handover preparation of a target handover cell is successful but a measurement report is not received by a source base station according to a seventh embodiment of the present invention;
fig. 9 is a flowchart of a processing method for UE bearer or context change when handover preparation of a target handover cell is successful but a measurement report is not received by a source base station according to an eighth embodiment of the present invention;
fig. 10 is a flowchart of a processing method for a source base station not receiving a UE measurement report or triggering UE handover when a handover waiting timer times out according to a ninth embodiment of the present invention;
fig. 11 is a flowchart of a processing method for a source base station not receiving a UE measurement report or triggering UE handover when a handover waiting timer times out according to a tenth embodiment of the present invention;
fig. 12 is a schematic structural diagram of a base station according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic flow chart of a cell handover method of the present invention, as shown in fig. 1, including the following steps:
step 101: the source base station acquires one or more candidate cells and sequentially sends a switching request message to the home base station of the one or more candidate cells.
Here, the source base station may directly obtain the configured one or more candidate cells through a background network manager, and sequentially send a handover request message to the home base station of the one or more candidate cells to prepare for handover.
Preferably, after the sequentially sending the handover request messages to the home base stations of the one or more candidate cells, the method further includes:
and the source base station receives the switching preparation response messages returned by all the candidate cells and starts a switching waiting timer.
Step 102: and after receiving the measurement report, the source base station determines a candidate cell with the highest priority as a target switching cell according to the measurement report, and indicates the UE to switch to the target switching cell after determining that the target switching cell is successfully prepared.
Here, the source base station receives the measurement report sent by the UE within the handover waiting time, and selects the candidate cell with the lightest load and the best signal quality as the target handover cell according to the information of the load and the signal quality of the candidate cell carried by the measurement report.
Preferably, when the number of candidate cells is more than two, after the UE handover is completed, the source base station instructs other candidate cells except the target handover cell in the candidate cells to cancel the handover preparation.
Here, after the UE handover is completed, the source base station sends a handover cancel message and a context release command to other target base stations except the target base station to which the target handover cell belongs, so as to cancel the handover of the UE and release resources prepared for the UE by the other target base stations.
Preferably, the source base station does not receive the measurement report within the handover waiting time, or does not trigger the handover of the UE, and the source base station instructs the target base station to which the candidate cell is assigned to prepare for the handover successfully to cancel the handover.
Preferably, after receiving the handover preparation response message returned by the candidate cell, the source base station, when determining that the context information of the UE changes or the UE bearer changes within the handover waiting time, processes the context information of the UE or the UE bearer, indicates the target base station to which the candidate cell that is successfully prepared for handover belongs to cancel the handover, and then sends a handover request message to the one or more candidate cells, so that the one or more candidate cells prepare for handover again.
Preferably, after receiving the handover preparation response message returned by the candidate cell, the source base station determines that the context information of the UE changes or the UE bearer changes within the handover waiting time, and processes the context information of the UE or the UE bearer, and indicates, through the UE context modification procedure or the UE bearer modification procedure, the target base station to which the candidate cell that is successfully prepared for handover belongs to perform the UE context modification or the UE bearer modification.
After the target base station successfully modifies the UE context or the UE bearer, step 102 is executed; and after the target base station fails to modify the UE context or modify the UE bearing, the source base station indicates the target base station belonging to the candidate cell with successful switching preparation to cancel the switching.
Fig. 2 is a flowchart illustrating a cell handover method according to a first embodiment of the present invention, where the first embodiment is a cell handover method based on an S1 interface, as shown in fig. 2, including the following steps:
step 201: and the source eNB issues a measurement control message to the UE.
Here, the source eNB issues a measurement control message to the UE through an RRC connection reconfiguration message, where the measurement control message carries measurement configuration parameters, and the UE performs measurement on an execution object according to the measurement configuration parameters.
Step 202 to step 203: the source eNB acquires the candidate cell, and sequentially sends a handover request message to the target eNB1 to the target eNB N where the candidate cell is located through a Mobility Management Entity (MME).
Here, the source eNB may obtain all neighboring cells configured in the cell from the neighboring cell configuration module of the network management as candidate cells, and the obtained candidate cells may belong to different target enbs.
Step 204: the target eNB1 to target eNB N return a handover request response message to the MME.
Here, after the handover preparation is performed by the target eNB1 to the target eNB N, the handover request response messages 1 to N are sequentially returned to the MME.
Step 205: and the MME sequentially returns the switching command message of the target eNB to the source eNB.
Here, the MME sequentially returns handover command messages 1 to N of target eNB1 to target eNB N to the source eNB.
Step 206 to step 207: and the source eNB receives the measurement report sent by the UE, and selects a candidate cell with successful switching preparation according to the candidate cell information in the measurement report and the priority to execute the switching.
Here, the source eNB starts a handover waiting timer, and during the handover waiting time, the source eNB receives a measurement report sent by the UE, and selects an optimal candidate cell as a target cell according to parameters such as load and signal quality of the candidate cell in the measurement report to perform handover, and in this embodiment, it is assumed that a home base station of the target cell is the target eNB 1.
Step 208: the source eNB sends a handover command to the UE.
Here, the source eNB transmits a handover command to the UE through an RRC connection reconfiguration message.
Step 209: and context data is transmitted back between the source eNB and the target eNB.
Here, the source eNB sends the UE's context data to the target eNB1, and the target eNB1 sends the context data to the UE over the air interface to enable the UE to synchronize to the target handover cell when handing over the cell.
Step 210: the UE sends a handover confirm message to the target eNB.
Here, the UE synchronizes to the target cell through random access, and carries a handover confirm message through an RRC connection reconfiguration complete message.
Step 211: the target eNB returns a handover notification message to the MME.
Here, the target eNB1 returns a handover notification message to the MME.
Step 212 to step 213: and the MME sends a UE context release command message to the source eNB and receives a UE context release completion message returned by the source eNB.
Here, the MME sends a UE context release command message to the source eNB to release resources, context data, and the like on the source eNB side, and after the release is completed, returns a UE context release completion message to the MME.
Step 214: the source eNB sends a handover cancel message to the MME.
Here, the source eNB stops the handover waiting timer and sequentially sends a handover cancel message to the MME, where the handover cancel message is a handover cancel message from the target eNB2 to the target eNB N; and if the target eNB fails to prepare for handover, not sending a handover cancel message corresponding to the target eNB.
Step 215 to step 216: the MME sequentially sends UE context release command messages to the target eNB2 to the target eNB N; and receives a UE context release complete message returned by target eNB2 to target eNB N.
Here, since it is determined that the target eNB1 is the home base station of the target handover cell, no operation is required for the remaining target base stations, i.e., the target eNB2 to the target eNB N, the MME sequentially transmits a UE context release command message to the target eNB2 to the target eNB N for releasing resources, context data, and the like on the target eNB side, and after the release is completed, returns a UE context release completion message to the MME.
Step 217: and the MME sequentially sends switching cancellation response messages from the target eNB2 to the target eNB N to the source eNB to complete cell switching.
Fig. 3 is a flowchart illustrating a cell handover method according to a second embodiment of the present invention, where the second embodiment is a cell handover method based on an X2 interface, as shown in fig. 3, including the following steps:
step 301: and the source eNB issues a measurement control message to the UE.
Here, the source eNB issues a measurement control message to the UE through an RRC connection reconfiguration message, where the measurement control message carries measurement configuration parameters, and the UE performs measurement on an execution object according to the measurement configuration parameters.
Step 302 to step 303: the source eNB acquires the candidate cells, sequentially sends switching request messages to the target eNB to which the candidate cells belong, and sequentially receives switching request response messages returned by the target eNB.
Here, the source eNB may obtain all neighboring cells configured in the cell from the neighboring cell configuration module of the network management, and there may be multiple obtained candidate cells, and the multiple candidate cells may belong to different target enbs, and it is assumed that the candidate cells belong to the target enbs 1 to the target eNB N in the embodiment of the present invention, therefore, the source eNB sequentially sends the handover request message 1 to the handover request message N to the target enbs 1 to N, and sequentially receives the handover request response messages 1 to N returned by the target enbs 1 to N.
Step 304 to step 305: and the source eNB receives a measurement report sent by the UE, and selects a candidate cell with successful switching preparation according to the candidate cell information in the measurement report and the priority to execute the switching.
Here, the source eNB starts a handover waiting timer, and after receiving a measurement report reported by the UE during the handover waiting time, selects an optimal candidate cell as a target cell according to parameters such as load and signal quality of the candidate cell in the measurement report to perform handover, and in this embodiment, the target cell is assumed to be a neighboring cell of the target eNB 1.
Step 306: the source eNB sends a handover command to the UE.
Here, the source eNB transmits a handover command to the UE through an RRC connection reconfiguration message.
Step 307: and context data is transmitted back between the source eNB and the target eNB.
Here, the source eNB sends the UE's context data to the target eNB1, and the target eNB1 sends the context data to the UE over the air interface to enable the UE to synchronize to the target handover cell when handing over the cell.
Step 308: the UE sends a handover confirm message to the target eNB.
Here, the UE synchronizes to the target cell through random access, and carries a handover confirm message through an RRC connection reconfiguration complete message.
Step 309 to step 310: and the target eNB sends a path switching request message to the MME and receives a path switching request response message returned by the MME.
Step 311: the target eNB sends a context resource release command message to the source eNB.
Here, the target eNB1 transmits a UE context release command message to the source eNB to release resources, context data, and the like on the source eNB side.
Step 312: the source eNB sends a handover cancel message to the target eNB2 to the target eNB N to complete the cell handover.
Here, the source eNB stops the handover waiting timer, and since the handover resources of the remaining target base stations are not required if the target eNB1 is determined to be the home base station of the target handover cell, the source eNB transmits a handover cancel message to the target eNB2 to the target eNB N, and does not transmit the handover cancel message corresponding to the target eNB if the handover preparation of the target eNB fails.
The embodiment of the present invention further provides several methods for a source base station to obtain a candidate cell, where the first method for obtaining a candidate cell is as described above, and a source eNB can obtain all neighbor cells configured in the cell from a neighbor cell configuration module of a network manager, except for the above-mentioned methods, the embodiment of the present invention further describes a method for a source base station to obtain a candidate cell, fig. 4 is a schematic flow diagram of a method for a source base station to obtain a candidate cell according to a third embodiment of the present invention, and as shown in fig. 4, the method includes the following steps:
step 401: the source eNB acquires the neighbor cell configured by the cell from a neighbor cell configuration module of the network management, and records the neighbor cell as a configured neighbor cell set.
Step 402: and the source eNB acquires historical switching information of the cell within a certain time, acquires all the switched neighbor cells according to the historical switching information, and records the switched neighbor cells as a switched neighbor cell set.
Here, the source eNB acquires the historical handover information of the local cell within a certain time, and acquires all the handed-out neighbor cells according to the historical handover information of all the UEs in the local cell, including the historical handover information of all the UEs in the local cell within the certain time.
Step 403: and the source eNB acquires the intersection of the configured neighbor cell set and the cut neighbor cell set as a candidate cell.
Fig. 5 is a flowchart illustrating a method for a source base station to acquire a candidate cell according to a fourth embodiment of the present invention, as shown in fig. 5, including the following steps:
step 501: the source eNB acquires the neighbor cell configured by the cell from a neighbor cell configuration module of the network management, and records the neighbor cell as a configured neighbor cell set.
Step 502: and the source eNB acquires historical switching information of the UE in the cell within a certain time, acquires all the switched neighbor cells according to the historical switching information, and records the switched neighbor cells as a switched neighbor cell set.
Here, the source eNB acquires the historical handover information of the UE in the local cell within a certain time, and acquires all the handed-out neighbor cells according to the historical handover information of the current UE in the local cell.
Step 503: and the source eNB takes the intersection of the configured neighbor cell set and the cut neighbor cell set as a candidate cell.
Fig. 6 is a flowchart of a processing method for UE bearer change when handover preparation of a target handover cell is successful but a source base station does not receive a measurement report according to a fifth embodiment of the present invention, and as shown in fig. 6, this embodiment is a processing method based on an S1 interface, and includes the following steps:
step 601: and the source eNB issues a measurement control message to the UE.
Here, the source eNB issues a measurement control message to the UE through an RRC connection reconfiguration message, where the measurement control message carries measurement configuration parameters, and the UE performs measurement on an execution object according to the measurement configuration parameters.
Step 602 to step 603: the source eNB acquires the candidate cell, and sequentially sends a handover request message to the target eNB1 to the target eNB N where the candidate cell is located through the mobility management entity MME.
Here, the source eNB may obtain all neighboring cells configured in the cell from the neighboring cell configuration module of the network management as candidate cells, and the obtained candidate cells may belong to different target enbs, assuming that the candidate cells belong to target enbs 1 to N in the embodiment of the present invention, therefore, the source eNB sequentially sends the handover request message 1 to the handover request message N to the target enbs 1 to N through the MME.
Step 604: the target eNB1 to target eNB N return a handover request response message to the MME.
Here, after the handover preparation is performed by the target eNB1 to the target eNB N, the handover request response messages 1 to N are sequentially returned to the MME.
Step 605: and the MME sequentially returns the switching command message of the target eNB to the source eNB.
Here, the MME sequentially returns handover command messages 1 to N of target eNB1 to target eNB N to the source eNB.
Step 606: and the source eNB finds out UE bearing change and processes the UE bearing change, wherein the UE bearing change comprises the following steps: bearer establishment, bearer deletion, bearer modification, and the like.
Step 607: and the source eNB sequentially sends a switching cancellation message corresponding to the target eNB to the MME.
Here, after the UE bearer change process is completed, the source eNB sends a handover cancel message of the target base station to the MME, which is the handover cancel message 1 to the handover cancel message N from the target eNB1 to the target eNB N in sequence.
Step 608 to step 609: and the MME sequentially sends UE context release command messages to the target eNB and sequentially receives UE context release completion messages returned by the target eNB.
Here, the MME sequentially transmits UE context release command messages 1 to N to the target eNB1 to N to release resources, context data, and the like on the target eNB side, and after the release is completed, sequentially returns UE context release completion messages 1 to N to the MME from the target eNB1 to the target eNB N.
Step 610: the MME in turn returns handover cancel responses from target eNB1 to target eNB N to the source eNB.
Here, after the MME sequentially returns the handover cancel response messages 1 to N from the target eNB1 to the target eNB N to the source eNB, the MME resumes the handover preparation, and re-executes the cell handover method based on the S1 interface provided in the second embodiment of the present invention, that is, steps 202 to 217 in fig. 2, to complete the cell handover of the UE.
Fig. 7 is a flowchart of a processing method for UE bearer change when handover preparation of a target handover cell is successful but a source base station does not receive a measurement report according to a sixth embodiment of the present invention, as shown in fig. 6, this embodiment is a processing method based on an X2 interface, and includes the following steps:
step 701: and the source eNB issues a measurement control message to the UE.
Here, the source eNB issues a measurement control message to the UE through an RRC connection reconfiguration message, where the measurement control message carries measurement configuration parameters, and the UE performs measurement on an execution object according to the measurement configuration parameters.
Step 702 to step 703: the source eNB acquires the candidate cells, sequentially sends switching request messages to the target eNB to which the candidate cells belong, and sequentially receives switching request response messages returned by the target eNB.
Here, the source eNB may obtain all neighboring cells configured in the cell from the neighboring cell configuration module of the network management, and there may be multiple obtained candidate cells, and the multiple candidate cells may belong to different target enbs, and it is assumed that the candidate cells belong to the target enbs 1 to the target eNB N in the embodiment of the present invention, therefore, the source eNB sequentially sends the handover request message 1 to the handover request message N to the target enbs 1 to N, and sequentially receives the handover request response messages 1 to N returned by the target enbs 1 to N.
Step 704: discovering UE bearing change by a source eNB, and processing the UE bearing change, wherein the UE bearing change comprises: bearer establishment, bearer deletion, bearer modification, and the like.
Step 705: and the source eNB sequentially sends a switching cancellation message corresponding to the target eNB to the MME.
Here, after the UE bearer change processing is completed, the source eNB sends a handover cancel message of the target base station to the MME, which is in turn a handover cancel message 1 of the target eNB1 to a handover cancel message N of the target eNB N;
further, after the source eNB sequentially sends the handover cancel message corresponding to the target eNB to the MME, the handover preparation is performed again, and the cell handover method based on the X2 interface provided in the third embodiment of the present invention is executed again, in which step 302 to step 312 in fig. 3.
Fig. 8 is a flowchart of a processing method for UE bearer or context change when handover preparation of a target handover cell is successful but a source base station does not receive a measurement report according to a seventh embodiment of the present invention, and as shown in fig. 8, this embodiment is a processing method based on an X2 interface, which includes the following steps:
step 801: the source eNB sends a UE context modification request message to the target eNB.
Here, the UE context modification request carries Old eNB UE X2AP ID identification, New eNB UE X2AP ID identification, Aggregate Maximum Bit Rate (AMBR), security key, UE security capability, subscriber Profile identification of radio access technology/frequency priority (SPID), and the like.
Step 802 a: and if the target eNB successfully processes the UE context modification, the target eNB replies a UE context modification response message to the source eNB.
Here, the UE context modification response message carries an Old eNB UE X2AP ID identification, a New eNB UE X2AP ID identification, and the like.
Further, after the target eNB processes the UE context modification successfully, step 304 to step 312 in fig. 3 are continuously performed to complete the handover of the target cell, which is not described herein again.
Step 802 b: and if the target eNB fails to process the UE context modification, the target eNB replies a UE context modification failure message to the source eNB.
Here, the UE context modification failure message carries an Old eNB UE X2AP ID identification, a New eNB UE X2AP ID identification, a failure reason, and the like.
Here, when the target eNB fails to process the UE context modification, the source eNB sends a handover cancel message to the target eNB, indicating that the handover preparation is successful and the target base station to which the candidate cell belongs is cancelled.
Fig. 9 is a flowchart of a processing method for UE bearer or context change when handover preparation of a target handover cell is successful but a source base station does not receive a measurement report according to an eighth embodiment of the present invention, and as shown in fig. 9, this embodiment is a processing method based on an X2 interface, which includes the following steps:
step 901: the source eNB sends an evolved universal terrestrial radio access network radio access bearer modification request message to the target eNB.
Here, the evolved universal terrestrial radio access network radio access bearer modification request carries an Old eNB UE X2AP ID identification, a New eNB UE X2AP ID identification, an AMBR, a modified E-RAB list, identification and quality of service parameters of each E-RAB, and the like.
Step 902: and after the target eNB processes the evolved universal terrestrial radio access network radio access bearer modification request, replying an evolved universal terrestrial radio access network radio access bearer modification response message to the source eNB.
Here, the evolved universal terrestrial radio access network radio access bearer modification response message carries an Old eNB UE X2AP ID identification, a New eNB UE X2AP ID identification, a list of E-RABs that are successfully modified, and if there are E-RABs that are unsuccessfully modified, a list of E-RABs that are unsuccessfully modified, and the like.
Further, after the target eNB processes the UE context modification successfully, step 304 to step 312 in fig. 3 are continuously performed to complete the handover of the target cell, which is not described herein again; and when the target eNB fails to process the UE context modification, the source eNB sends a switching cancellation message to the target eNB to indicate the target base station to which the candidate cell which is successfully prepared for switching belongs to cancel the switching.
Fig. 10 is a flowchart of a processing method for a source base station handover waiting timer not receiving a UE measurement report or triggering UE handover after timeout according to a ninth embodiment of the present invention, as shown in fig. 10, this embodiment is a processing method based on an S1 interface, and includes the following steps:
step 1001: and the source eNB issues a measurement control message to the UE.
Here, the source eNB issues a measurement control message to the UE through an RRC connection reconfiguration message, where the measurement control message carries measurement configuration parameters, and the UE performs measurement on an execution object according to the measurement configuration parameters.
Step 1002 to step 1003: the source eNB acquires the candidate cell, and sequentially sends a handover request message to the target eNB1 to the target eNB N where the candidate cell is located through the mobility management entity MME.
Here, the source eNB may obtain all neighboring cells configured in the cell from the neighboring cell configuration module of the network management as candidate cells, and the obtained candidate cells may belong to different target enbs, assuming that the candidate cells belong to target enbs 1 to N in the embodiment of the present invention, therefore, the source eNB sequentially sends the handover request message 1 to the handover request message N to the target enbs 1 to N through the MME.
Step 1004: the target eNB1 to target eNB N return a handover request response message to the MME.
Here, after the handover preparation is performed by the target eNB1 to the target eNB N, the handover request response messages 1 to N are sequentially returned to the MME.
Step 1005: and the MME sequentially returns the switching command message of the target eNB to the source eNB.
Here, the MME sequentially returns handover command messages 1 to N of target eNB1 to target eNB N to the source eNB.
Step 1006 to step 1007: and when the source eNB switching waiting timer is overtime and does not receive the UE measurement report or trigger UE switching, sequentially sending a switching cancellation message corresponding to the target eNB to the MME.
Here, if the source eNB does not receive the measurement report sent by the UE or does not trigger the UE handover within the handover waiting time, the source eNB sends a handover cancel message of the target base station to the MME, where the handover cancel message is in turn handover cancel message 1 to handover cancel message N from target eNB1 to target eNB N.
Step 1008 to step 1009: the MME sequentially sends UE context release command messages to the target eNB1 to the target eNB N and sequentially receives UE context release completion messages returned by the target eNB1 to the target eNB N.
Here, the MME sequentially transmits a UE context release command message to the target eNB1 to the target eNB N to release resources, context data, and the like on the target eNB side, and after the release is completed, returns a UE context release completion message to the MME.
Step 1010: the MME sequentially returns handover cancel response messages 1 to N from target eNB1 to target eNB N to the source eNB.
Fig. 11 is a flowchart of a processing method for a source base station handover waiting timer not receiving a UE measurement report or not triggering UE handover when the timer times out according to a tenth embodiment of the present invention, as shown in fig. 11, this embodiment is a processing flow based on an X2 interface, and includes the following steps:
step 1101: and the source eNB issues a measurement control message to the UE.
Here, the source eNB issues a measurement control message to the UE through an RRC connection reconfiguration message, where the measurement control message carries measurement configuration parameters, and the UE performs measurement on an execution object according to the measurement configuration parameters.
Step 1102 to step 1103: the source eNB acquires the candidate cells, sequentially sends switching request messages to the target eNB to which the candidate cells belong, and sequentially receives switching request response messages returned by the target eNB.
Here, the source eNB may obtain all neighboring cells configured by the cell from the neighboring cell configuration module of the network management as candidate cells, and the obtained candidate cells may belong to different target enbs, assuming that the candidate cells belong to the target enbs 1 to the target eNB N in the embodiment of the present invention, therefore, the source eNB sequentially sends the handover request message 1 to the handover request message N to the target enbs 1 to the target enbs N through the MME, and sequentially receives the handover request response messages 1 to the handover request response messages N returned by the target enbs 1 to the target enbs N.
Step 1104 to step 1105: when the source eNB handover waiting timer expires without receiving a UE measurement report or triggering UE handover, the source eNB sends handover cancel messages 1 to N in sequence to the target eNB1 to N.
Here, if the source eNB does not receive the measurement report sent by the UE or does not trigger the UE handover within the handover waiting time, the source eNB sequentially sends handover cancel messages 1 to N to the target eNB1 to N to cancel the handover preparation on the target base station side.
Based on the above method, the present invention further describes a base station, which is used as a source base station, as shown in fig. 12, where the source base station includes: an obtaining module 1201, a sending module 1202, a receiving module 1203, a determining module 1204 and an indicating module 1205; wherein,
the obtaining module 1201 is configured to obtain one or more candidate cells, and send information of the one or more candidate cells to the determining module 1204;
the sending module 1202 is configured to send a handover request message to the home base station of the one or more candidate cells in sequence;
the receiving module 1203 is configured to receive a measurement report, and send the measurement report to the determining module 1204;
the determining module 1204 is configured to determine, according to the measurement report, a candidate cell with a highest priority as a target handover cell;
the indicating module 1205 is configured to indicate the UE to perform handover to the candidate cell after the target handover cell determined by the determining module 1204 is successfully prepared for handover.
Here, the obtaining module 1201 may directly obtain the configured one or more candidate cells through a base station background network manager, and a specific obtaining method may be the method described in fig. 4 and fig. 5, which is not described herein again.
Preferably, the indicating module 1205 is further configured to indicate, when the number of candidate cells is more than two, after the UE handover is completed, other candidate cells except for the target handover cell in the candidate cells to cancel the handover preparation.
Here, after the UE handover is completed, the indication module 1205 sends a handover cancel message and a context release command to other target base stations except the target base station to which the target handover cell belongs, so as to cancel the handover of the UE and release resources prepared for the UE by the other target base stations.
Preferably, the determining module 1204 is configured to select, according to the information about the load and the signal quality of the candidate cell carried in the measurement report, the candidate cell with the lightest load and the optimal signal quality as the target handover cell.
Preferably, the indicating module 1205 is further configured to, after the receiving module 1203 receives the handover preparation response messages returned by all candidate cells, within the handover waiting time, if the receiving module 1203 does not receive the measurement report or does not trigger the UE handover, indicate that the handover preparation is cancelled from the target base station to which the candidate cell belongs.
Preferably, the base station further includes a context management module 1206, configured to process the context information of the UE or the UE bearer when it is determined that the context information of the UE or the UE bearer changes within the handover waiting time;
the indicating module 1205 is further configured to indicate, after the context management module 1206 processes the context information of the UE or the UE bearer is completed, the target base station to which the candidate cell that is successfully prepared for handover belongs to cancel the handover;
the sending module 1202 is further configured to send a handover request message to the one or more candidate cells respectively, so that the one or more candidate cells perform handover preparation again.
Preferably, the indicating module 1205 is further configured to instruct, through a UE context modification procedure or a UE bearer modification procedure, the target base station to which the candidate cell that is successfully prepared for handover belongs to perform the UE context modification or the UE bearer modification after the context management module 1206 completes processing the context information or the UE bearer of the UE.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent, and improvement made within the spirit and scope of the present invention shall fall within the protection scope of the present invention.

Claims (12)

1. A method of cell handover, the method comprising:
a source base station acquires one or more candidate cells and sequentially sends a switching request message to a home base station of the one or more candidate cells;
the source base station acquiring one or more candidate cells, including: a source eNB acquires an intersection of a configured neighbor cell set and a cut-out neighbor cell set as candidate cells, wherein the configured neighbor cell set comprises neighbor cells configured in the cell, and the cut-out neighbor cell set comprises all cut-out neighbor cells acquired according to historical switching information;
and after receiving the measurement report, the source base station determines a candidate cell with the highest priority as a target switching cell according to the measurement report, and indicates User Equipment (UE) to switch to the target switching cell after determining that the target switching cell is successfully prepared.
2. The method of claim 1, further comprising:
when the number of the candidate cells is more than two, the source base station indicates other candidate cells except the target switching cell in the candidate cells to cancel the switching after the UE switching is completed.
3. The method of claim 1, wherein the determining the candidate cell with the highest priority as the target handover cell according to the measurement report comprises:
and the source base station selects the candidate cell with the lightest load and the optimal signal quality as the target switching cell according to the information of the load and the signal quality of the candidate cell carried by the measurement report.
4. The method of claim 1, wherein after sequentially sending handover request messages to the home base stations of the one or more candidate cells, the method further comprises:
after receiving the switching preparation response messages returned by all candidate cells, the source base station does not receive a measurement report sent by UE (user equipment) or triggers the UE to switch within the switching waiting time, and the source base station indicates the target base station to which the candidate cell which is successfully prepared for switching belongs to cancel the switching.
5. The method of claim 1, wherein after sequentially sending handover request messages to the home base stations of the one or more candidate cells, the method further comprises:
after receiving a handover preparation response message returned by the candidate cell, the source base station processes the context information or the UE bearer of the UE when determining that the context information of the UE changes or the UE bearer changes within the handover waiting time, indicates the target base station to which the candidate cell successfully prepared for handover belongs to cancel the handover, and then respectively sends a handover request message to the one or more candidate cells to enable the one or more candidate cells to perform handover preparation again.
6. The method of claim 1, wherein after sequentially sending handover request messages to the home base stations of the one or more candidate cells, the method further comprises:
and after receiving a switching preparation response message returned by the candidate cell, the source base station processes the context information or the UE bearer of the UE when determining that the context information or the UE bearer of the UE changes within the switching waiting time, and indicates a target base station belonging to the candidate cell with successful switching preparation to modify the context or the UE bearer of the UE through a UE context modification process or a UE bearer modification process.
7. A base station, the base station being a source base station, the base station comprising: the device comprises an acquisition module, a sending module, a receiving module, a determining module and an indicating module; wherein,
the acquiring module is configured to acquire one or more candidate cells and send information of the one or more candidate cells to the determining module;
the acquiring module is specifically configured to acquire, by a source eNB, an intersection of a configured neighboring cell set and a cut-out neighboring cell set as a candidate cell, where the configured neighboring cell set includes neighboring cells configured by a local cell, and the cut-out neighboring cell set includes all cut-out neighboring cells acquired according to historical handover information;
the sending module is configured to send a handover request message to the home base station of the one or more candidate cells in sequence;
the receiving module is used for receiving a measurement report and sending the measurement report to the determining module;
the determining module is configured to determine, according to the measurement report, a candidate cell with a highest priority as a target handover cell;
the indicating module is configured to indicate the UE to perform handover to the candidate cell after the target handover cell determined by the determining module is successfully prepared for handover.
8. The base station according to claim 7, wherein the indicating module is further configured to indicate other candidate cells except the target handover cell among the candidate cells to cancel the handover after the UE handover is completed when the number of the candidate cells is more than two.
9. The base station according to claim 7, wherein the determining module is configured to select a candidate cell with the lightest load and the best signal quality as the target handover cell according to the information about the load and the signal quality of the candidate cell carried in the measurement report.
10. The base station of claim 7, wherein the indicating module is further configured to, after the receiving module receives the handover preparation response messages returned by all candidate cells, within the handover waiting time, if the receiving module does not receive the measurement report or does not trigger the UE handover, indicate that the handover preparation is cancelled from the target base station to which the candidate cell belongs.
11. The base station of claim 7, wherein the base station further comprises a context management module, configured to process the context information of the UE or the UE bearer when it is determined that the context information of the UE or the UE bearer changes within the handover waiting time;
the indicating module is further configured to indicate the target base station to which the candidate cell is assigned for successful handover preparation to cancel the handover after the context management module processes the context information of the UE or the UE bearer is completed;
the sending module is further configured to send a handover request message to the one or more candidate cells, respectively, so that the one or more candidate cells perform handover preparation again.
12. The base station of claim 11,
the indicating module is further configured to instruct, through the UE context modification procedure or the UE bearer modification procedure, the target base station to which the candidate cell that is successfully prepared for handover belongs to perform the UE context modification or the UE bearer modification after the context management module processes the context information of the UE or the UE bearer is completed.
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