A method and device for realizing synchronization

Abstract

The present invention relates to the field of communication technology, and in particular to a method and device for realizing synchronization. The method is that, according to the SRS signal sent by the terminal, the base station screens out the RRU channel with the highest received power this time, and determines the channel with the highest received power this time. When the RRU channel is different from the RRU channel currently used for demodulation, the switch is not performed immediately. Only when the received power of the RRU channel is determined to meet the second maximum of the continuous preset threshold, the RRU channel switch is allowed, and the RRU channel is switched at the same time , send the TA command word to the terminal to complete the synchronization with the terminal, thus avoiding the phenomenon that the terminal may frequently switch at the subframe level between RRU channels, and, when switching, send the TA command word once to avoid When the RRU channel of the terminal changes, the TA command word cannot be received for a long time, which leads to the problem of time out of synchronization.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a method and device for realizing synchronization. Background technique [0002] In the Long Term Evolution (LTE) system, in the high-speed railway scenario, the train running speed is as high as 350km / h. In order to reduce the signaling overhead caused by the frequent switching of terminals between cells, the coverage method of cell combination is generally adopted, that is, single cell Distributed coverage is performed by using multiple radio remote units (Radio Remote Unit, RRU). Although this coverage method reduces the signaling overhead caused by handover, it also brings new problems. The terminal needs to perform state handover on multiple RRUs between cells and within the cell, which brings power changes and time delays. Variety. On the other hand, terminals on high-speed railways move fast and stay under a single RRU for a short time. The power and delay...

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Problems solved by technology

[0005] Embodiments of the present invention provide a method and device for achieving synchronization to solve the problem that the RRU channel used for TA adjustment and the RRU channel used for uplink demodulation may not be the same RRU channel in the prior art, resulting in time asynchrony between the base station and the terminal The problem

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