A precoding matrix indication method, device and system

Abstract

The present application relates to the technical field of wireless communication, and in particular to a precoding matrix indication method, device and system in a wireless communication system. This application provides a combined use of multi-level codebooks and a corresponding PMI feedback method. The user equipment receives the indication information sent by the network equipment, the indication information includes the information of the codebook used to report the precoding matrix indicator (Precoding Matrix Indicator, PMI), and the information of the codebook indicates that the codebook used is the first At least two of the first codebook to the Nth codebook, the PMI includes at least two of the first PMI to the Nth PMI, and the first PMI to the Nth PMI are respectively used to indicate the first codebook To the precoding matrix in the Nth codebook; according to the indication information, send the PMI.

Description

technical field [0001] The present application relates to the technical field of wireless communication, and in particular to a precoding matrix indication method, device and system in a wireless communication system. Background technique [0002] In a wireless network, in order to cooperate with the application of Multiple Input Multiple Output (MIMO) technology, network devices usually need to precode the transmitted data to reduce the difference between different data streams of the same user or data streams of different users. interference between them, thereby improving system performance. The information required by the network device for precoding is usually based on the downlink channel measurement information fed back by the user equipment. The user equipment performs channel estimation according to the reference signal sent by the network equipment, and selects the most suitable precoding matrix in the codebook containing multiple precoding matrices according to t...

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Problems solved by technology

In this way, for different scenarios, it is necessary for the network device to send high-level signaling to instruct the user equipment to use the corresponding codebook. The change is not flexible enough, the signaling overhead is large, and the codebook design is also very cumbersome.

[0004] In the ever-evolving wireless network, such as new air interface (New Radio, NR) technology, the configuration of reference signal resources will be more flexible, such as supporting periodic and aperiodic PMI reporting at the same time, and supporting non-precoded reference signals and precoded reference signals at the same time , the reference signal resources include the antenna ports in the multi-panel antenna array (Multi-panel antenna array) and dynamic activation and deactivation resources, etc., the existing PMI feedback scheme cannot meet the flexible and changeable PMI feedback in the wireless network need

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