CN102333352B - Method for reducing handover delay in LTE (long term evolution) system - Google Patents
Method for reducing handover delay in LTE (long term evolution) system Download PDFInfo
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Abstract
The invention discloses a method for reducing handover delay in an LTE (long term evolution) system. The method comprises the following steps: a source base station initiates handover requests in parallel to N target cells under the same target base station; the target base station determines whether to distribute another new terminal X2 application protocol identification or use the existing new terminal X2 application protocol identification; the target base station returns handover request response information or handover preparation failure information, wherein the information contains an old terminal X2 application protocol identification, the new terminal X2 application protocol identification and a target cell identification; and the source base station selects a cell as a handover cell after receiving the information of the target base station. The source base station and the target base station can differentiate a plurality of handover processes by utilizing the same old terminal X2 application protocol identification, new terminal X2 application protocol identification and target cell identification, therefore, according to the technical scheme provided by the invention, the handover preparation is allowed to be initiated in parallel to the plurality of cells under the same target base station, and the risks of handover delay and UE (user equipment) off-line are reduced.
Description
Technical field
The present invention relates to mobile communication technology, particularly relate to the method that reduces handover delay in a kind of Long Term Evolution (LTE, Long Term Evolution) system.
Background technology
At moving communicating field, the mobility of terminal UE has determined the extensive use of handoff technique, the handoff technique of existing LTE is all stipulated according to 3GPP (3rd generation partnership project) X2AP agreement (X2 application protocol), for a UE, on same X2 interface, the same time only allows an X2 to switch preparation.Therefore,, if a plurality of Target cell belongs to same target BS, source base station can only receive that the failure response message of first aim community sends handover request message to second target community afterwards again.
Fig. 1 is the X2AP protocol switching flow chart of prior art foundation.As shown in Figure 1, a complete handoff procedure comprises: switch and prepare, switch and carry out, switched.In handoff preparation phase, source base station sends and measures after control message to terminal UE, terminal is to source base station reporting measurement reports, source base station carries out switch decision according to measurement report and RRM (RRM) information of UE, relevant target BS is sent to handover request, target BS, for this UE receives control, sends switching request response to source base station.After switching set-up procedure finishes, system starts to switch to be carried out and switches complete process, sends the RRC connection reconfiguration message that comprises mobile control information by source base station to terminal UE.Now, in conjunction with a concrete handoff scenario, further set forth the switching preparation method of prior art.Fig. 2 is a UE handoff scenario schematic diagram, under this scene, terminal UE can be to source base station reporting subdistrict a and community b as the community satisfying condition as shown in Figure 2, as shown in Figure 3, Fig. 3 is that prior art is for twice handover request flow chart of same target BS to concrete switching flow.If community a and b belong to same base station in this flow chart, source base station can only be selected Yi Ge community according to switch determining method, supposes preferentially to have selected community a to switch preparation.Source base station sends the handover request of community a to target BS, if target BS is controlled according to receiving, return to the switching of Liao Yige community a and prepare failed message, and source base station is received after this failure response, just can continue initiation and prepare for the switching of community b.If target BS is received the handover request of community b, receive after control, to source base station, beamed back a successful handover request, source base station this could select community b as Target cell, sends the RRC that comprises mobile control information connect reconfiguration message to terminal UE.
Use existing handoff technique, if switch a plurality of communities of preparing to concentrate, belong to same base station, because switching flow can not be concurrent, can only serial carry out, will increase the duration of handoff preparation phase, and increase the risk of UE call drop.
Summary of the invention
The invention provides a kind of method that reduces handover delay in Long Term Evolution LTE system, the method can walk abreast to initiate to switch and prepare, and reduces the risk of handover delay and UE call drop, has improved the reliability of system.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention discloses a kind of method that reduces handover delay in Long Term Evolution LTE system, source base station is need to be to N Target cell under same target BS parallel to be initiated to switch and prepares, and N is greater than 1 integer, and the method comprises:
Source base station sends the handover request message for a described N Target cell to target BS simultaneously;
The handover request message of target BS to each Target cell, all judges whether the old sign of terminal X2 application protocol of being distributed by source base station in this handover request message exists in this locality;
If the old sign of terminal X2 application protocol does not exist, target BS is a terminal X2 application protocol new logo of the new distribution of the old sign of this terminal X2 application protocol; If the old sign of terminal X2 application protocol exists, target BS is the terminal X2 application protocol new logo that the old sign of this terminal X2 application protocol is distributed before finding out;
Target BS is received control, sends handover request ack message or switches prepare failed message to source base station, and described message comprises the sign of the old sign of terminal X2 application protocol, terminal X2 application protocol new logo and this Target cell;
Source base station is received one or more handover request ack message from target BS, selects a Target cell as final switching target small area.
A plurality of handover request ack message that source base station is received, for other unchecked each Target cell, source base station sends corresponding handover cancelling message to target BS, and target BS discharges the switchable resource that has prepared for UE this community.
From above-mentioned, in this Long Term Evolution LTE of the present invention system, reduce the method for handover delay, at source base station and target BS, use the identical old sign of terminal X2 application protocol (Old eNB UE X2AP ID), terminal X2 application protocol new logo (New eNB UE X2AP ID), and in each relevant message of X2AP protocol switching flow process: handover request ack message, switch and prepare failed message, handover cancelling message, SN state transfer message, UE context release message, increase Target Cell Identifier (Target Cell ID), so just can distinguish same mobile phone at the switching flow of the different districts of same target BS, thereby realized on X2 interface uses switch to prepare for same target BS more, reduced handover delay, increase the possibility of handover success and the risk of UE call drop.
Accompanying drawing explanation
Fig. 1 is the X2AP protocol switching flow chart of prior art foundation;
Fig. 2 is a kind of UE handoff scenario schematic diagram;
Fig. 3 is that prior art is for twice handover request flow chart of same target BS;
Fig. 4 prepares signaling process figure for a kind of switching that the embodiment of the present invention provides more;
Fig. 5 makees many handover request handling principle block diagram for same target BS in the embodiment of the present invention
Embodiment
In order to make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the drawings and specific embodiments, describe the present invention.
Fig. 4 is that a kind of switching that the embodiment of the present invention provides prepared signaling process figure more, and the present embodiment has been realized the terminal under mobile context shown in Fig. 2 and switched.Under the UE handoff scenario shown in Fig. 2, there are two target BS communities, target BS community a and target BS community b, these two Target cells belong to same target BS (being N=2), and N can also adopt according to concrete system other numerical value in an embodiment of the present invention.Many switchings of the embodiment of the present invention are prepared signaling process figure as shown in Figure 4, source base station is UE allocating and measuring process according to mobile restriction information, when source base station receives the measurement report of self terminal, source base station reports according to measurement and RRM (RRM) information is carried out after switch decision, to target BS, initiate the handover request for Target cell a and Target cell b simultaneously, target BS is received respectively control to the handover request of the handover request of the community a receiving and community b, and judge whether the Old eNB UE X2AP ID in handover request message exists, if there is no, for this Old eNB UE X2AP ID is new, distribute a New eNB UE X2AP ID, if existed, need the New eNB UEX2AP ID distributing for this Old eNB UE X2AP ID before finding out.The switching request response with community b is prepared unsuccessfully in target BS returns to Liao Yige community a switching after doing and receive controlling, in two message target BS all before Old eNB UE X2AP ID, New eNB UE X2AP ID and the Target Cell ID of acquisition returned to together source base station.Source base station is received from the switching of target BS and is prepared failure and switching request response, selects community b as Target cell, and the RRC that the comprises mobile control information connection reconfiguration message of target BS generation is dealt into terminal, starts the handoff procedure to community b.Because source base station and target BS are used one group of identical Old eNB UE X2AP ID and New eNB UE X2AP ID, add that newly-increased Target Cell ID just can distinguish the handoff procedure of different target community, realize the switching of same target BS Xia Duo community and prepare parallel carrying out.
Fig. 5 makees many handover request handling principle block diagram for same target BS in the embodiment of the present invention, and as shown in Figure 5, the method comprises:
501, source base station sends the handover request message for a described N Target cell to target BS simultaneously.
502, the handover request message of target BS to each Target cell, all judges whether the Old eNB UE X2AP ID being distributed by source base station in this handover request message exists in this locality.
503, if Old eNB UE X2AP ID exists, target BS is the New eNB UE X2AP ID that this Old eNB UE X2AP ID distributes before finding out.
504, if Old eNB UE X2AP ID does not exist, target BS is the new New eNB UE X2AP ID of distribution of this Old eNBUE X2AP ID.
505, target BS is received control, sends handover request ack message or switches prepare failed message to source base station, and described message comprises Old eNB UE X2AP ID, New eNB UE X2AP ID and Target Cell ID.
506, source base station is received one or more handover request ack message from target BS, selects a Target cell as final switching target small area.
507, a plurality of handover request ack message that source base station is received, for other unchecked each Target cell, source base station sends corresponding handover cancelling message to target BS, and target BS discharges the switchable resource that has prepared for UE this community.
From above-mentioned, target BS is that same Old eNB UE X2AP ID distributes identical New eNB UE X2AP ID, based on said method, while initiating handover request to a plurality of communities under same base station simultaneously, source base station passes through in the relevant message of X2AP protocol switching with target BS---switching request response (HANDOVER REQUEST ACKNOWLEDGE), switch and prepare unsuccessfully (HANDOVER PREPARATION FAILURE), SN state transfer (SN STATUS TRANSFER), UE context discharges (UE CONTEXT RELEASE), in handover cancelling (HANDOVER CANCEL) message, increase Target Cell ID, in handoff procedure thereafter, use Old eNB UE X2AP ID+New eNB UE X2AP ID+Target Cell ID just can identify a handoff procedure, a plurality of cell parallels of distinguishing under same target BS are initiated handoff procedure.
By above-mentioned introduce known, in the Long Term Evolution LTE system of the present embodiment, reduce the method for handover delay, if solved a plurality of communities that in LTE system, switching prepares to concentrate, belong to the problem that same base station switching flow can not be concurrent, preparation is switched in the parallel initiation in a plurality of Target cells having realized under same target BS, greatly reduced the duration of handoff preparation phase, reduce the risk of UE call drop, improved the reliability of system.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (5)
1. in Long Term Evolution LTE system, reduce a method for handover delay, it is characterized in that, source base station need to parallel initiation switch in situation about preparing to N Target cell under same target BS, and N is greater than 1 integer, and the method comprises:
Source base station sends the handover request message for a described N Target cell to target BS simultaneously;
The handover request message of target BS to each Target cell, all judges whether the old sign of terminal X2 application protocol of being distributed by source base station in this handover request message exists in this locality;
If the old sign of terminal X2 application protocol does not exist, target BS is a terminal X2 application protocol new logo of the new distribution of the old sign of this terminal X2 application protocol; If the old sign of terminal X2 application protocol exists, target BS is the terminal X2 application protocol new logo that the old sign of this terminal X2 application protocol is distributed before finding out;
Target BS is received control, sends handover request ack message or switches prepare failed message to source base station, and described message comprises the old sign of terminal X2 application protocol, the sign of terminal X2 application protocol new logo and this Target cell;
Source base station is received one or more handover request ack message from target BS, selects a Target cell as final switching target small area;
The method further comprises: in the relevant SN state transfer message of X2 interface application protocol X2AP switching flow, increase the handoff procedure that Target Cell Identifier is distinguished different target community.
2. method according to claim 1, is characterized in that, the method further comprises: in the relevant UE context release message of X2 interface application protocol X2AP switching flow, increase the handoff procedure that Target Cell Identifier is distinguished different target community.
3. method according to claim 1, it is characterized in that, the method further comprises: source base station is received a plurality of handover request ack message, for other unchecked each Target cell, source base station sends corresponding handover cancelling message to target BS, and target BS discharges the switchable resource that has prepared for UE this community.
4. method according to claim 3, is characterized in that, the method further comprises: in the relevant handover cancelling message of X2 interface application protocol X2AP switching flow, increase the handoff procedure that Target Cell Identifier is distinguished different target community.
5. method according to claim 1, it is characterized in that, described target BS is received after the handover request message from N Target cell of source base station, according to the configuring condition of a local N local resource, sends handover request ack message or switches prepare failed message to source base station.
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| US9191974B2 (en) | 2012-10-12 | 2015-11-17 | Wipro Limited | Method and system for session admission control in broadband wireless network |
| CN104301960A (en) * | 2013-07-18 | 2015-01-21 | 中兴通讯股份有限公司 | Community switching method, system and base station |
| CN104349409B (en) * | 2013-07-30 | 2019-11-05 | 中兴通讯股份有限公司 | A kind of cell switching method and base station |
| BR112019025745A2 (en) * | 2017-07-25 | 2020-06-23 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | DELIVERY METHOD AND TERMINAL DEVICE |
| CN115396927A (en) * | 2018-12-29 | 2022-11-25 | 华为技术有限公司 | Communication method and device |
| WO2021028617A1 (en) | 2019-08-14 | 2021-02-18 | Nokia Solutions And Networks Oy | Preparation of multiple target cells for a handover in a wireless communication network |
| CN111182565B (en) * | 2019-12-30 | 2023-07-28 | 京信网络系统股份有限公司 | Method, device, equipment and storage medium for controlling base station switching |
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