Datang Mobile Communications Equipment Co., Ltd.

Xiaojuan Zhang

Xi Wang

Dongsheng Li

Zhen Zhang

Gang Wu

Yuetan Chen

Xiaoer Xia

Xin Xu

Yunfei Li

Liming Zhang

Jian Ge

Yijin Wang

Lei Liu

The invention relates to the technical field of communications, and more particularly, to a method and device for realizing synchronization. The method comprises: performing, by a base station, and according to an SRS signal transmitted by a terminal, filtering to obtain a RRU channel having the maximum receiving power in a current operation; upon determining that the RRU channel having the maximum receiving power in the current operation is different from a RRU channel used in the currently performed demodulation, refraining from performing immediate switching; and permitting switching of the RRU channel only when the receiving power of the RRU channel is determined to match the maximum threshold of a preset series of thresholds, and transmitting a TA command word to the terminal while switching the RRU channel to complete synchronization with the terminal. The invention prevents a terminal from frequently switching between RRU channels on a subframe basis. Moreover, a TA command word is transmitted while switching is being performed, thereby preventing a problem in which when a change in a RRU channel occurs, a TA command word is not received by a terminal for a long time, resulting in an asynchronous operation.

Method and device for realizing synchronization

The present invention discloses a method and system for processing frequency offset, the method includes: obtaining a current frequency offset state; determining whether the current frequency offset state is consistent with a historical effective frequency offset state; wherein the historical effective frequency offset state is a frequency offset state corresponding to a correct decoding result; if it is determined yes, performing a pre-compensation to a fine frequency offset estimation according to the historical effective frequency offset state. The present application solves the problem that inaccurate frequency offset estimation makes it unable to perform frequency offset compensate.

Method and system for processing frequency offset

A method and device for dual layer beamforming are disclosed to solve the problems of bad beam directivity and poor beamforming effect in current methods for beamforming wherein the method comprises: receiving sounding reference signal (SRS) sent by the terminal wherein the broadband occupied when sending the SRS is divided into a plurality of sub-bands by the terminal; determining the broadband beamforming vector corresponding to the broadband and the sub-band beamforming vector corresponding to each sub-band respectively according to the SRS; determining two polarized-direction beamforming vectors corresponding to each sub-band respectively according to the broadband beamforming vector corresponding to the broadband or the sub-band beamforming vector corresponding to each sub-band; and directed to each sub-band, adopting the two polarized-direction beamforming vectors corresponding to the sub-band for dual layer beamforming. The method for dual layer beamforming of the present application has stronger beam directivity and better beamforming effect.

Method and device for dual layer beamforming

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Beijing, China

Xiaojuan Zhang