Optimized weighted CSI feeding back method and device for cooperative beam forming

Abstract

The invention discloses an optimized weighted CSI feeding back method for cooperative beam forming, which comprises that: in a cooperative beam forming mode, a terminal (UE) estimates the state information of a channel from a service cell to the terminal by using a channel state indication reference signal (CSI-RS); the UE estimates the state information of an equivalent channel from main interfering neighboring cell to the UE by using a demodulation reference signal (DMRS); and the UE calculates a weighted CSI by using the state information of the channel from the service cell to the UE and the state information of the equivalent channel from the main interfering neighboring cell to the UE and feeds the weighted CSI to the service cell. The invention also provides an optimized weighted CSI feeding back device for cooperative beam forming. With the method and the device, channel information interaction between the service cell and the main interfering neighboring cell is not required in the feedback of the weighted CSI.

Description

technical field [0001] The present invention relates to display feedback technology in Downlink Coordinated Multipoint Transmission (DL CoMP), in particular to an optimized weighted channel state information (CSI) feedback method and device for coordinated beamforming. Background technique [0002] The explicit feedback method (explicit feedback) in Down Link Coordinated Multi-Point Transmission (DL CoMP, Down Link Coordinated Multi Point Transmission) includes channel response matrix feedback, channel covariance matrix feedback, interfering cell channel characteristic feedback and other methods. The advantage of display feedback is that more detailed channel information can be obtained, which can greatly improve the performance of the system; its disadvantage is that the amount of feedback data is large. When used for InterCell CoMP (InterCell CoMP), the amount of channel information exchanged between base stations larger. [0003] Currently, a weighted channel state infor...

AI Technical Summary

Problems solved by technology

[0021] The above-mentioned Weighted CSI display feedback method can effectively compress the amount of feedback from the UE to the base station under the condition of small performance loss, but still requires the exchange of channel information between the base stations (ie weighted CSI)

However, in the current standardization process, there is no clear support for the interaction of channel information, especially explicit channel information, of coordinated cells.

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