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Synchronization process, base station and terminal for communication system

A communication system and terminal technology, applied in the communication between multiple stations, synchronization signal speed/phase control and other directions, can solve the problems of increasing signaling overhead, increasing synchronization delay, indistinguishable, etc., and reducing signaling Overhead, the effect of reducing synchronization delay

Inactive Publication Date: 2012-12-05
CHINA ACAD OF TELECOMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] In the existing communication system, after the terminal receives the instruction from the base station, the synchronization sequence code used by the terminal to initiate the synchronization process is the same as the synchronization sequence code used by the terminal to initiate the random access process, so the base station cannot distinguish whether the received synchronization sequence code is random The access process is still a synchronization process that is expected to be initiated by the terminal, so after the terminal receives the timing and power adjustment information sent by the base station, it must notify the RNC of its identity, and then the RNC will notify the base station of the terminal identity that initiated the synchronization process, so that the base station can determine that the terminal has Complete synchronization, this process will inevitably lead to increased signaling overhead and increased synchronization delay
[0017] In the Long Term Evolution (LTE, Long Term Evolution) system, there are problems similar to the above. During the resynchronization process between the base station and the terminal, the terminal also needs to send its identity to the network side on the uplink resource allocated to it by the network side. However, in the LTE system, the base station can directly analyze the content sent from the uplink resource, and does not need other nodes to analyze and notify

Method used

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  • Synchronization process, base station and terminal for communication system
  • Synchronization process, base station and terminal for communication system
  • Synchronization process, base station and terminal for communication system

Examples

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Embodiment 1

[0061] The flow of the communication system synchronization method provided by Embodiment 1 of the present invention is as follows figure 1 As shown, the specific steps are as follows:

[0062] Step 101, preset the mapping relationship between the synchronization sequence code and the index information, and inform the base station and the terminal of the mapping relationship.

[0063] In this step, the network side can select one or more sequence codes from existing random access synchronization sequence codes (such as SYNC UL codes) or define a set of specific sequence codes separately as synchronization sequences dedicated to resynchronization of out-of-sync terminals code, and inform the terminal and base station of the selected or defined synchronization sequence code information. At the same time, the network side can set short index information, such as the mapping relationship between the indication field value or the invalid sequence value on the existing control chan...

Embodiment 2

[0092] The flow of the communication system synchronization method provided by Embodiment 2 of the present invention is as follows Figure 4 As shown, the specific steps are as follows:

[0093] Step 401, the base station determines the synchronization sequence code used by the terminal to initiate the synchronization process;

[0094] In this step, the network side can still select one or more sequence codes from the existing random access synchronization sequence codes (such as SYNC UL codes) or define a set of specific sequence codes separately as synchronization codes dedicated to the resynchronization of out-of-synchronization terminals. sequence code, and inform the terminal and the base station of the selected or defined synchronization sequence code information, and the base station can select one of them for the terminal to initiate a synchronization process.

[0095] Step 402, the base station sends the determined synchronization sequence code to the terminal;

[0...

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Abstract

The invention discloses a synchronous method for a communication system, which comprises the following steps: a base station selects index information corresponding to a synchronous sequence code used by initializing a synchronous process by a terminal from a preset mapping relation set between synchronous sequence codes and index information, and sends the selected index information to the terminal; the synchronous sequence code sent from the terminal is received, and is a synchronous sequence code that the terminal finds from the preset mapping relation set according to the received index information; the timing advance of the terminal is determined according to the time that the synchronous sequence code is received and the preset time delay of the time that the synchronous sequence code is expected to receive; and the determined timing advance is sent to the terminal. The invention also discloses the base station and the terminal. The synchronous method for the communication system can reduce the signaling cost in the synchronous process of the base station and the terminal, and shorten the synchronous time delay.

Description

technical field [0001] The present invention relates to the technical field of mobile communication, in particular to a communication system synchronization method, a base station and a terminal. Background technique [0002] In a mobile communication system, especially in a Time Division Duplex (TDD, Time Division Duplex) communication system, when a terminal performs data communication with a base station, it must maintain synchronization with the base station in order to effectively receive and send data. In existing communication systems, such as 3GPP R4 standards, dedicated channel services are usually used to maintain synchronization between terminals and base stations. When terminals or base stations have no data to send for a long time, special sequences are periodically sent on preset dedicated channels. , to maintain the synchronization relationship between the terminal and the base station. For example, the base station can judge and notify the terminal of the ti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/26H04L7/04
Inventor 高卓李晓卡
Owner CHINA ACAD OF TELECOMM TECH
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