CN102333352A - 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); To a UE, the same time only allows an X2 to switch preparation on same X2 interface.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 Target cell is afterwards again to second Target cell transmission handoff request message.
Fig. 1 is the X2AP agreement switching flow figure of prior art foundation.As shown in Figure 1, a complete handoff procedure comprises: switch and prepare, switch and carry out, switch and accomplish.In handoff preparation phase; Source base station is after terminal UE is sent measurement control message, and the terminal is to the source base station reporting measurement reports, and source base station carries out switch decision according to measurement report and RRM (RRM) information of UE; Target BS to relevant sends handoff request; Target BS sends switching request response for this UE admits control to source base station.After switching the set-up procedure end, system start-up is switched execution and is switched complete process, sends to terminal UE through source base station to comprise the RRC connection reconfiguration message that moves control information.Combine a concrete handoff scenario at present, further set forth the switching preparation method of prior art.Fig. 2 is a UE handoff scenario sketch map; It is as shown in Figure 2 that terminal UE can be to source base station reporting subdistrict a and sub-district b as the sub-district that satisfies condition under this scene; Concrete switching flow is as shown in Figure 3, and Fig. 3 is twice handoff request flow chart that prior art is directed against same target BS.If sub-district a and b belong to same base station in this flow chart, then source base station can only be selected a sub-district according to switch determining method, supposes preferentially to have selected sub-district a to switch preparation.The handoff request that source base station sends sub-district a to target BS is prepared failed message if target BS, has returned the switching of a sub-district a according to admitting control, and after source base station was received this failure response, the switching that just can continue to initiate to sub-district b was prepared.If target BS is received the handoff request of sub-district b; After admitting control; Beamed back the handoff request of a success to source base station, source base station this could select sub-district b as Target cell, sends to terminal UE to comprise the RRC connection reconfiguration message that moves control information.
Use existing handoff technique, belong to same base station,, can only serial carry out, will increase the duration of handoff preparation phase, and increase the risk of UE call drop because switching flow can not be concurrent if switch a plurality of sub-districts of preparing to concentrate.
Summary of the invention
The invention provides the method that reduces handover delay in a kind of Long Term Evolution LTE system, this 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 the method that reduces handover delay in a kind of Long Term Evolution LTE system, source base station need be initiated the switching preparation to the Target cell of the N same target BS under is parallel, and N is the integer greater than 1, and this method comprises:
Source base station sends the handoff request message to a said N Target cell simultaneously to target BS;
Target BS judges all to the handoff request message of each Target cell whether the terminal old sign of X2 application protocol of being distributed by source base station in this handoff request message exists in this locality;
If the terminal old sign of X2 application protocol does not exist, target BS is terminal X2 application protocol new logo of the new distribution of the old sign of this terminal X2 application protocol; If the terminal old sign of X2 application protocol exists, the terminal X2 application protocol new logo that distributes for the old sign of this terminal X2 application protocol before target BS is found out;
Target BS is admitted control, sends handover request ack message or switches to source base station and prepare failed message, comprises the sign of the old sign of terminal X2 application protocol, terminal X2 application protocol new logo and this Target cell in the said message;
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 sub-district.
By above-mentioned visible; Reduce the method for handover delay in this Long Term Evolution LTE of the present invention system; 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) at source base station with target BS; And in each relevant message of X2AP agreement switching flow: failed message, handover cancelling message, SN state transfer message, UE context release message are prepared in handover request ack message, switching; Increase Target Cell Identifier (Target Cell ID), so just can distinguish the switching flow of same mobile phone, thereby realized on X2 interface, using switch to prepare more to same target BS at the different districts of same target BS; Reduce handover delay, increased the possibility of handover success and the risk of UE call drop.
Description of drawings
Fig. 1 is the X2AP agreement switching flow figure of prior art foundation;
Fig. 2 is a kind of UE handoff scenario sketch map;
Fig. 3 is twice handoff request flow chart that prior art is directed against same target BS;
Fig. 4 prepares signaling process figure for a kind of switching that the embodiment of the invention provides more;
Fig. 5 is that the same target BS that is directed against in the embodiment of the invention is made many handoff request handling principle block diagram
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer, describe the present invention below in conjunction with accompanying drawing and specific embodiment.
Fig. 4 is that a kind of switching that the embodiment of the invention provides prepared signaling process figure more, and present embodiment has been realized the terminal switching under the mobile scene shown in Figure 2.Under UE handoff scenario shown in Figure 2; Two target BS sub-districts are arranged; Target BS sub-district a and target BS sub-district b, these two Target cells belong to same target BS (being N=2), and N can also adopt other numerical value according to concrete system design in an embodiment of the present invention.Many switchings of the embodiment of the invention are prepared signaling process figure and are seen shown in Figure 4; Source base station is a UE allocating and measuring process according to moving restricted information; When source base station receives the measurement report of self terminal, source base station is initiated the handoff request to Target cell a and Target cell b to target BS after carrying out switch decision according to measurement and report and RRM (RRM) information simultaneously; Target BS is admitted control respectively to the handoff request of the sub-district a that receives and the handoff request of sub-district b; And judge whether the Old eNB UE X2AP ID in the handoff request message exists, if do not exist, distribute a New eNB UE X2AP ID for this Old eNB UE X2AP ID is new; If exist, the New eNB UEX2AP ID that distributes for this Old eNB UE X2AP ID before then need finding out.Target BS has returned the switching preparation failure of a sub-district a and the switching request response of sub-district b after doing and admitting control, and target BS has all returned to source base station to the Old eNB UE X2AP ID, New eNB UE X2AP ID and the Target Cell ID that obtain before together in two message.Source base station is received switching preparation failure and the switching request response from target BS, selects sub-district b as Target cell, and is dealt into the terminal to the RRC connection reconfiguration message that moves control information that comprises that target BS generates, and starts the handoff procedure to sub-district b.Because source base station uses one group of identical Old eNB UE X2AP ID and New eNB UE X2AP ID with target BS; Add that newly-increased Target Cell ID just can distinguish the handoff procedure of different target sub-district, realize that parallel carrying out prepared in the many sub-districts switching under the same target BS.
Fig. 5 is that the same target BS that is directed against in the embodiment of the invention is made many handoff request handling principle block diagram, and as shown in Figure 5, this method comprises:
501, source base station sends the handoff request message to a said N Target cell simultaneously to target BS.
502, target BS judges all to the handoff request message of each Target cell whether the Old eNB UE X2AP ID that is distributed by source base station in this handoff request message exists in this locality.
503, if Old eNB UE X2AP ID exists, the New eNB UE X2AP ID that distributes for this Old eNB UE X2AP ID before target BS is found 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 admitted control, sends handover request ack message or switches to source base station and prepare failed message, comprises Old eNB UE X2AP ID, New eNB UE X2AP ID and Target Cell ID in the said message.
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 sub-district.
By above-mentioned visible; Target BS is that same Old eNB UE X2AP ID distributes identical New eNB UE X2AP ID; Based on said method; When handoff request is initiated simultaneously in a plurality of sub-districts under same base station; Source base station passes through to switch relevant message in the X2AP agreement with target BS---and switching request response (HANDOVER REQUEST ACKNOWLEDGE), switching prepare to increase in failure (HANDOVER PREPARATION FAILURE), SN state transfer (SN STATUS TRANSFER), UE context release (UE CONTEXT RELEASE), handover cancelling (HANDOVER CANCEL) message 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, distinguish the parallel handoff procedure of initiating in a plurality of sub-districts under the same target BS.
Can know through above-mentioned introduction; Reduce the method for handover delay in the Long Term Evolution LTE system of present embodiment; Belong to the problem that same base station switching flow can not be concurrent if solved a plurality of sub-districts that switching prepares to concentrate in the LTE system, realized that the parallel initiation switching of a plurality of Target cells under the same target BS is prepared, significantly reduced the duration of handoff preparation phase; Reduce the risk of UE call drop, improved the reliability of system.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.
Claims (6)
1. reduce the method for handover delay in the Long Term Evolution LTE system, it is characterized in that, source base station need be under the parallel situation of initiating the switching preparation of the Target cell of the N same target BS under, and N is the integer greater than 1, and this method comprises:
Source base station sends the handoff request message to a said N Target cell simultaneously to target BS;
Target BS judges all to the handoff request message of each Target cell whether the terminal old sign of X2 application protocol of being distributed by source base station in this handoff request message exists in this locality;
If the terminal old sign of X2 application protocol does not exist, target BS is terminal X2 application protocol new logo of the new distribution of the old sign of this terminal X2 application protocol; If the terminal old sign of X2 application protocol exists, the terminal X2 application protocol new logo that distributes for the old sign of this terminal X2 application protocol before target BS is found out;
Target BS is admitted control, sends handover request ack message or switches to source base station and prepare failed message, comprises X2 application protocol old sign in terminal in the said message, 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.
2. method according to claim 1 is characterized in that, this 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 the different target sub-district.
3. method according to claim 1 is characterized in that, this 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 the different target sub-district.
4. method according to claim 1; It is characterized in that; This 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 sub-district.
5. method according to claim 4 is characterized in that, this 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 the different target sub-district.
6. method according to claim 1; It is characterized in that; After said target BS is received the handoff request message from N Target cell of source base station,, send handover request ack message or switch to source base station and prepare failed message according to the configuring condition of N the local resource of this locality.
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| US9204332B2 (en) | 2012-10-12 | 2015-12-01 | Wipro Limited | Method and system for session admission control in broadband wireless network |
| CN110622558A (en) * | 2017-07-25 | 2019-12-27 | Oppo广东移动通信有限公司 | Switching method, access network equipment and terminal equipment |
| CN111182565A (en) * | 2019-12-30 | 2020-05-19 | 京信通信***（中国）有限公司 | Method, device, equipment and storage medium for controlling base station switching |
| CN111385830A (en) * | 2018-12-29 | 2020-07-07 | 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 |
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| CN111385830A (en) * | 2018-12-29 | 2020-07-07 | 华为技术有限公司 | Communication method and device |
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| CN111182565A (en) * | 2019-12-30 | 2020-05-19 | 京信通信***（中国）有限公司 | Method, device, equipment and storage medium for controlling base station switching |
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