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Method for realizing uplink synchronization during inter-cell switch process

A handover process and inter-cell technology, applied in synchronization devices, communication between multiple stations, transmission monitoring, etc., can solve the problems of not receiving time adjustment information, increased access delay, and multiple transmissions, etc. Achieve the effect of avoiding data loss, reducing switching delay, and reducing delay

Active Publication Date: 2011-08-10
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0015] From the above uplink synchronization process in inter-cell handover, it can be seen that the random access sequence applied by the user terminal is randomly selected from the available access resources, so that when the random access sequence is sent on the RACH for testing, It is very likely that a collision will occur, that is, it is the same as the random access sequence selected by other UEs, so that the UE may not receive the time adjustment information fed back by the base station, which will result in the need to send random access sequences multiple times for testing, so that the UE may not receive the time adjustment information fed back by the base station. The input delay increases, resulting in data loss

Method used

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  • Method for realizing uplink synchronization during inter-cell switch process
  • Method for realizing uplink synchronization during inter-cell switch process
  • Method for realizing uplink synchronization during inter-cell switch process

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Embodiment Construction

[0041] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0042] image 3 It is a schematic flowchart of an embodiment of implementing uplink synchronization in the handover process of the present invention. In this example, base station 1 is the base station in the original cell where the UE is located, and base station 2 is the base station in the handover target cell.

[0043] Step 301, the UE measures several candidate cells to be handed over, and reports a measurement report to the original cell, and the base station in the original cell knows the target cell to be handed over by the UE according to the measurement report, and knows the absolute downlink reception time difference between the target cell and the target cell Δ 0 .

[0044] Step 302, the base station 1 in the original cell sends a handover request signaling to the base station 2 in the target cell, the handover request signaling includes the targ...

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Abstract

The invention discloses a method to realize the ascending synchronization in the switch between the sections, the key is: making the UE entering the section foresees the adjusting time in the target section, when the UE enters the target section, according to the foresee switching adjusting information adjusts the ascending synchronization adjusting, it can reduce the time delay in the switch of ascending synchronization greatly, and reduce the time delay in the switch to avoid to lose the data, and ensures the subsequent data can be received synchronously. All steps in the invention use the source in the system, and no need to increase other cost, and save the system source. When the UE switches into target section, it can execute the ascending synchronization trace adjusting operation with the base station in the target section to improve the accuracy of ascending synchronization.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method for realizing uplink synchronization in the handover process between cells. Background technique [0002] In modern wireless communication systems, in order to achieve frequency or code multiplexing, the system will provide services for as many user terminals as possible within a limited and allowed frequency range. For this reason, cell technology is generally used, that is, According to the user density, the area served by a system is divided into different cells or sectors, and one or more wireless base stations (BS) are set in each cell or sector, and each cell uses different or the same carrier frequency or code to achieve Frequency or code multiplexing to achieve the highest possible system capacity and spectrum utilization. [0003] Since the mobile communication system adopts a cellular structure, when a user terminal (UE, User Equipment) crosses ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/26H04W36/00H04B17/00H04W56/00
Inventor 马莎黄睿王程宇
Owner HUAWEI TECH CO LTD
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