Resynchronization method and system for LTE system

Abstract

The invention discloses a resynchronization method and a resynchronization system for an LTE (long term evolution) system. The resynchronization method comprises the following steps: receiving a subframe at least containing a secondary synchronization signal; determining the position of the secondary synchronization signal according to a frame structure, and intercepting SSS data with the length of K / M ahead of N / M sampling points; downsampling and filtering by using the intercepted SSS data; judging whether a same-frequency adjacent region exists or not, and if so, eliminating interference according to the configured same-frequency adjacent region; performing secondary synchronization channel estimation on a measured cell according to the secondary synchronization signal from which same-frequency interference is eliminated, and acquiring a timing time of the secondary synchronization signal; according to the output timing time of the secondary synchronization signal, measuring again by using a cell-based reference signal, and measuring the output timing time as a final resynchronization timing output. Through the resynchronization method and the resynchronization system, the time needed in the resynchronization process of the LTE is greatly reduced, and the timing precision and the timing error range of resynchronization output are improved relatively highly.

Description

technical field [0001] The present invention relates to a resynchronization method and system, in particular to a resynchronization method and system used in an LTE system. Background technique [0002] With the development and progress of society, people require mobile terminals not only to provide high-quality voice and text services, but also to provide high-speed, large-capacity and low-latency digital multimedia application services. In order to meet this growing demand of people, at the end of 2004, the 3rd Generation Partnership Project (3GPP, 3rd Generation Partnership Project) started the Long Term Evolution (LTE, Long Term Evolution) project of the universal mobile communication system technology. [0003] In the LTE system, the terminal often needs to perform timing synchronization with the base station before and after handover or when waking up from sleep. In the prior art, the specific steps of terminal resynchronization during handover and reselection are as ...

AI Technical Summary

Problems solved by technology

[0010] (1) The position where errors are prone to occur during the reselection process;

[0011] (2) The timing accuracy of the reselection output is not high;

[0012] (3) The output OTD2 range is between -992Ts and 32Ts. If the local timing is much earlier than the network timing, it is easy to cause resynchronization timing output errors

[0025] (1) The number of receiving data is too many, which affects the sleep time;

[0026] (2) There may be many PSS outputs under synchronization, and it is impossible to accurately determine the PSS position corresponding to the resynchronization cell, so it will affect the SSS fine synchronization in the second stage, resulting in wrong timing of resynchronization output;

[0027] (3) The timing accuracy of the output is not high

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