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Method for implementing synchronization and distance finding in wireless communication system and implementing apparatus thereof

A wireless communication system and a technology for synchronizing messages, applied in the direction of synchronization devices, wireless communications, synchronization devices, etc., can solve the problems of inaccurate synchronization accuracy and complex structure, and achieve improved synchronization accuracy and operation stability, simple structure, and reduced costs Effect

Inactive Publication Date: 2008-01-02
ZTE CORP
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Problems solved by technology

The above-mentioned applications or patents have either insufficient synchronization accuracy or complex structures.

Method used

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  • Method for implementing synchronization and distance finding in wireless communication system and implementing apparatus thereof

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Embodiment Construction

[0025] A method for implementing synchronization and ranging in a wireless communication system, implemented by a base station and a terminal, includes the following steps. By sending timing synchronization messages at nominal intervals in the downlink direction, the base station creates a global clock reference. The message includes a timestamp that identifies exactly when the base station sent the message. The endpoint must compare the actual time the message was received with the timestamp and thereby adjust the local clock reference. It is assumed here that the delay introduced by the physical layer is relatively fixed. Any variation in physical layer delay must be accounted for in the guard time in the physical layer overhead.

[0026] The nominal interval for sync messages is 10ms. This makes the downlink overhead very small when the terminal quickly obtains the global clock reference.

[0027] The terminal constantly judges whether it receives a synchronization messa...

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Abstract

The invention discloses a method for realizing synchronization and range measurement in wireless communication system and the apparatus for carry out the method, wherein the base station transmits the synchronization message frame with base station time tag and uplink channel allocation message at the downlink direction at a nominal intervals, the terminal receiving the uplink channel allocation message and transmitting range measurement request message frame, the base station comparing the received range measurement request message frame with the time recorded upon arrival, thus obtaining the terminal time migration adjusted value and requiring the terminal to adjust the time reference counter of itself, the terminal adjusting its time reference counter by one time lag early of the base station. The invention can be applied to the situation for sending range measurement, timing and accurate synchronization between terminal base stations in the wireless communication systems.

Description

technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to a method for realizing an air synchronization and ranging mechanism of a point-to-multipoint wireless communication system and an implementing device thereof. Background technique [0002] Chinese patent application, application number 01137971.5 disclosed on April 24, 2002 a method for transmitting a synchronization signal during a synchronization time slot in time-division multiplexed mobile wireless communication, using a method of determining the delay from maximum power to minimum power, Chinese patent Application, application number 00805498.3 disclosed a method for effective synchronization in a communication system on April 24, 2002, using a method of repeating sequences with the same period length for synchronization, Chinese Patent No. 96193602.9 International Publication WO97 / 32446 British 1997.9 .4, discloses an apparatus and method for reducing exces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04Q7/20H04L7/00G01S11/02H04B7/26G01S1/02H04W56/00
Inventor 王云峰李刚闫华梁曹俊程浩范炯毅
Owner ZTE CORP
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