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Method and base station for indicating restart of time alignment timer of terminal

A technology of time alignment and timer, which is applied in the communication between multiple stations, electrical components, synchronization devices, etc., and can solve the problem of uncontrollable terminal base stations

Active Publication Date: 2012-12-26
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a method and a base station for instructing to restart the terminal time alignment timer, so as to solve the problem in the prior art that the terminal may be out of control of the base station due to TAT out of synchronization

Method used

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  • Method and base station for indicating restart of time alignment timer of terminal
  • Method and base station for indicating restart of time alignment timer of terminal
  • Method and base station for indicating restart of time alignment timer of terminal

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Embodiment Construction

[0047] The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

[0048] figure 2 In order to instruct a schematic diagram of the implementation flow of the method for restarting the terminal time alignment timer, as shown in the figure, the uplink synchronization maintenance process may include the following steps:

[0049] Step 201, determine the TAT timeout time of the terminal;

[0050] Step 202: Before the TAT of the terminal times out, the base station sends a time alignment command to the terminal, instructing the terminal to restart the TAT.

[0051] Since the TAT startup time of the terminal and the base station is different, the TAT startup time of the terminal is earlier than that of the base station. In order to maintain the uplink synchronization, during the implementation process, the base station re-sends the TA cmd to the terminal before the terminal's TAT ​​times out when maintaining the uplink sy...

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Abstract

The invention discloses a method and a base station for indicating the restart of a time alignment timer of a terminal, wherein the method comprises the following steps of: determining the overtime time of the time alignment timer of the terminal; and sending a time alignment command to the terminal by the base station before the time alignment timer of the terminal is overtime so as to indicate the terminal to restart the time alignment timer. The method and the base station can ensure that the terminal cannot lose synchronization because the time alignment timer is overtime so as to standardize the action of the terminal and prevent the terminal from generating a series of operations which cannot be controlled by the base station because of the loss of synchronization.

Description

technical field [0001] The present invention relates to the field of mobile communications, in particular to a method and a base station for instructing restarting a terminal time alignment timer. Background technique [0002] The uplink synchronization timing is used to maintain the uplink synchronization of the terminal and the base station, so as to facilitate the terminal to perform uplink data transmission and correct feedback of downlink data. In the LTE (Long Term Evolution, Long Term Evolution) system, it is stipulated that the base station maintains uplink synchronization. [0003] figure 1 A schematic diagram of the implementation flow for the uplink synchronization maintenance process, such as figure 1 As shown, the uplink synchronization maintenance process is: after the base station starts, it sends a TA cmd (time alignment command) to the terminal, and if the terminal cannot correctly receive the TA cmd, the terminal does not process the TAT (Time alignment t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W56/00H04B7/26
Inventor 赵亚利高卓
Owner DATANG MOBILE COMM EQUIP CO LTD
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