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Network assisting and UE control type fast cell handover method and device

A network-assisted, cell handover technology, applied in electrical components, wireless communication, etc., can solve the problems of increasing UE dropped calls and prolonging handover, so as to improve the handover success rate, reduce handover delay, and reduce the risk of UE dropped calls Effect

Active Publication Date: 2016-01-06
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In the existing cell handover method, after the UE reports the measurement report, it needs to go through two stages of handover preparation and handover execution to establish an air interface connection with the target cell. The handover time is prolonged, which increases the risk of UE call drop, especially for high-speed railways and other high-speed rails. mobility scene

Method used

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  • Network assisting and UE control type fast cell handover method and device
  • Network assisting and UE control type fast cell handover method and device
  • Network assisting and UE control type fast cell handover method and device

Examples

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Embodiment 1

[0036] The overall processing of the present invention is as figure 1 shown.

[0037] Step 101: the source base station obtains one or more candidate cells according to the configured neighbor cell list, and jumps to step 102;

[0038] Step 102: The source base station interacts with the base station to which the candidate cell belongs respectively through the handover request process to obtain information related to the wireless interface prepared by the corresponding candidate cell for UE handover, and jump to step 103;

[0039] Step 103: The source base station organizes network assistance information, including handover mode and handover decision information, candidate cell identifier, and information related to the radio interface of the candidate cell, and then configures it to the UE through the RRC connection reconfiguration message, and then skips to step 104 ;

[0040] Step 104: The UE performs measurement according to the configured handover method and obtains the...

Embodiment 2

[0043] X2-based network-assisted UE control handover such as figure 2 shown. In this embodiment, there are N candidate cells for selection, and the UE selects candidate cell 1 as the handover target cell.

[0044] Step 201: the source base station selects N candidate cells according to the configured neighboring cells, and jumps to step 202;

[0045] Step 202: The source base station sends a handover request message to the target base stations 1 to N to which the candidate cell belongs to request resource allocation for UE handover, and jumps to step 203;

[0046] Step 203: The target base stations 1 to N to which the candidate cell belongs sequentially perform admission control, and allocate resources for UE handover; the target base stations 1 to N to which the candidate cell belongs to sequentially reply to the source base station with handover request acknowledgment, carrying information related to the radio interface and establishment For the successful evolved radio a...

Embodiment 3

[0058] S1-based network-assisted UE control handover such as image 3 shown. In this embodiment, there are N candidate cells for selection, and the UE selects candidate cell 1 as the handover target cell.

[0059] Step 301: the source base station selects N candidate cells according to the configured neighboring cells, and jumps to step 302;

[0060] Step 302: The source base station sends handover request messages to the MME respectively, requesting resource preparation on the target side, and jumping to step 303;

[0061] Step 303: MME sends handover request messages to target base stations 1 to N to which the candidate cells belong, requesting resource preparation, and jumps to step 304;

[0062] Step 304: The target base stations 1 to N to which the candidate cell belongs sequentially perform admission control, and allocate resources for UE handover; the target base stations 1 to N to which the candidate cell belongs to reply the handover request response to the MME in t...

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Abstract

The present invention discloses a network assisting and UE (user equipment) control type fast cell handover method and device and is used for performing fast cell handover. The fast cell handover method comprises: obtaining one or a plurality of candidate cells by a source base station according to a configured adjacent cell list; interacting the source base station and a base station to which each candidate cell belongs for preparing resources for UE handover; organizing network assisting information by the source base station, and then re-configuring messages to the UE by radio resource control (RRC) connection; and measuring by the UE according to a configured handover manner, optimizing one of the configured candidate cells to be used as a handover target cell during handover judgment, and then synchronizing the selected target cell. According to the method and the device, through the adoption of a network assisting and UE control type handover manner, a handover process is optimized, the handover time delay is reduced, a risk of call drop of the UE during cell handover is reduced, the handover success rate is increased, the continuity of services is ensured, and the use experience is improved. The method and the device are particularly suitable for high-mobility scenes, such as high-speed rails or air line covering places, etc.

Description

technical field [0001] The present invention relates to the problem of cell switching in a long-term evolution (LTE: Long-Term Evolution) communication system, especially the problem of fast cell switching in high-mobility scenarios such as high-speed railways. Background technique [0002] In order to ensure the service continuity of the user equipment (UE, User Equipment) in the radio resource control (RRC, RadioResourceConnection) connected state RRC_CONNECTED, the LTE system uses a network-controlled UE-assisted manner to perform handover. The whole handover process includes three stages: handover preparation, handover execution, and handover completion. The specific switching process is as follows: [0003] In the handover preparation phase, the source base station (note: the base station in the LTE system refers to an evolved Node B (eNB, EvolvedNodeB)) receives the measurement report reported by the UE according to the measurement configuration requirements, channel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W36/00H04W36/30H04W36/32
CPCH04W36/0061H04W36/0072H04W36/0077H04W36/0083H04W36/30H04W36/32
Inventor 马征章正权邓滔范平志王献
Owner SOUTHWEST JIAOTONG UNIV
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