Method and system for realizing cell search and downlink synchronization

Abstract

The invention provides a method and a system for realizing cell search and downlink synchronization. The method includes the steps of dividing sub-bands of frequency spectrum of a communication system into a plurality of clusters, setting the sub-band at the center of each cluster as a cell searching sub-band and the other sub-bands in the cluster as normal sub-bands; dividing a synchronizing signal into a plurality of sub-sections; adding the sub-sections and a physical broadcast (PBCH) channel in the cell searching sub-bands according to a smaller period, and adding the sub-sections in the normal sub-bands according to a larger period; and adding other downlink data in normal sub-bands of the frequency spectrum of the communication system and transmitting sub-band information. While cell search and downlink synchronization are realized, frequency spectrum source can be saved.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method and system for realizing cell search and downlink synchronization. Background technique [0002] In the Long Term Evolution (LTE) system, through the cell search process, the user equipment (UE) and the serving cell realize time and frequency synchronization of downlink signals, and determine the physical layer ID of the cell. [0003] The process of cell search at the physical layer mainly involves two synchronization signals, namely a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). The cell search process includes downlink time and frequency synchronization and cell physical ID detection. After these operations are completed, the UE can start to read the system information in the physical broadcast channel (PBCH) of the serving cell for further operations. During this period, after obtaining synchronization with the se...

AI Technical Summary

Problems solved by technology

[0008] In the above method, because the synchronization signal needs to occupy multiple OFDM symbols in the subband, a large amount of resources for sending control channels and data channels are occupied, and the spectrum efficiency is low.

It can be seen that although the existing methods for realizing cell search and downlink synchronization effectively solve the problems of discontinuous sub-band sub-carriers and limited sub-band effective sub-carriers, the spectrum resources are seriously wasted.

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