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Switching method, user terminal and network side device

A user terminal and pre-handover technology, which is applied in the field of handover methods, user terminals and network side equipment, can solve problems such as large delays, achieve the effects of shortening handover delays and increasing synchronization accuracy

Active Publication Date: 2010-12-29
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the process of implementing the present invention, the inventors found that: during the handover process, the random access process for uplink synchronization will bring a relatively large time delay

Method used

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  • Switching method, user terminal and network side device
  • Switching method, user terminal and network side device
  • Switching method, user terminal and network side device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] see figure 2 , a handover method provided in an embodiment of the present invention without performing a random access procedure, including:

[0039] Step 21, the user terminal acquires the timing advance of the target cell before handover.

[0040] In the coordinated multi-point scenario and the carrier aggregation scenario, the uplink signal of the UE is detected, measured and even received. Therefore, multiple coordinated access points or component carriers can measure UE uplink signals, including physical uplink control channel (Physical Uplink Control Channel, PUCCH), physical uplink shared channel (Physical Uplink Shared Channel, PUSCH), sounding reference signal ( Sounding Reference Signal, SRS) etc. to obtain the time advance TA (Time Advance, TA) of the handover target cell. For other adjacent cells outside the measurement set, if the UE's uplink signal is also detected and measured, the same method can be used to obtain the timing advance TA relative to the...

Embodiment 2

[0087] Corresponding to the above embodiments of the switching method, this embodiment of the present invention provides another switching method, see Figure 9 ,include:

[0088] Step 91, before the handover, the target cell sends the timing advance of the target cell to the user terminal through the source cell.

[0089] Step 92, the target cell sends the uplink scheduling grant of the target cell to the user terminal.

[0090] Step 93: The target cell receives the handover completion message sent by the user terminal on the resources corresponding to the uplink scheduling grant with the timing advance.

[0091] As described in the above method embodiments, before the handover, the target cell sends the timing advance of the target cell to the user terminal through the source cell, the following scheme can be adopted:

[0092] The target cell carries the time advance of the target cell in the handover request confirmation message sent to the source cell, so that the source...

Embodiment 3

[0101] Corresponding to the above embodiments of the switching method, the embodiment of the present invention provides another switching method, see Figure 10 ,include:

[0102] Step 11, the source cell acquires the timing advance of the target cell.

[0103] Step 12, the source cell sends the timing advance of the target cell to the user terminal before the handover.

[0104] Step 13, the source cell receives the handover completion indication sent by the target cell to confirm the handover completion of the user terminal.

[0105] As described in the above method embodiments, the source cell may adopt the following scheme to obtain the timing advance of the target cell:

[0106] Solution 1, the source cell acquires the timing advance of the target cell from the handover request confirmation message sent by the target cell; or,

[0107] Solution 2, the source cell receives the timing advance of the target cell that is periodically sent by the target cell or triggered by ...

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Abstract

The embodiment of the invention discloses a switching method, a user terminal and a network side device, which can shorten the switching time delay of a control plane and the interruption time delay of user plane data. One switching method comprises the following steps: the user terminal obtains the amount of advanced time of a target district before switching; and an upstream scheduling permission which is sent by the target district is obtained; and switch completing information is sent to the target district on a resource corresponding to the upstream scheduling permission by using the amount of advanced time. Another switching method comprises the following steps: the target district sends the amount of advanced time of the target district to the user terminal through a source district before switching; the upstream scheduling permission of the target district is sent to the user terminal; and the switch completing information which is sent by the user terminal on the resource corresponding to the upstream scheduling permission by using the amount of advanced time is received.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a handover method, user terminal and network side equipment. Background technique [0002] In an existing Long Term Evolution (LTE) system, when a user terminal (UE) performs handover between cells, it adopts a random access procedure (Random Access Procedure) to acquire uplink synchronization with a target cell. [0003] figure 1 Among them, when the source cell (Source Cell) receives the radio resource control (Radio Resource Control, RRC) measurement report (Measurement Reports) of the UE, it sends a handover request (Handover Request) message to the target cell, and receives the handover request returned by the target cell After requesting a response (HandoverRequest Confirm) message, a handover command (Handover Command) is sent to the UE. According to the handover command, the UE starts to separate from the source cell and synchronize to the target ...

Claims

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Application Information

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IPC IPC(8): H04W36/08H04W74/08H04W88/02H04L1/16H04L1/18
CPCH04W36/0077H04W88/08H04W72/1289H04W88/02H04W36/34H04W72/23H04W36/0011H04W36/249H04W56/0045H04W36/24H04W36/14H04W36/08
Inventor 宋巍巍陈玉华韩静闫志宇于映辉熊新
Owner HUAWEI TECH CO LTD
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