CSI Feedback Precoding for Reduced CSI-RS Antenna Overhead
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Solution Overview
Problem
The increase in the number of transmitting antennas in base stations enhances throughput and spectral efficiency but increases the overhead of channel-state information reference signal (CSI-RS) transmission, and the variability in antenna ports among different base stations complicates efficient communication.
Innovation Solution
A method for transmitting channel state information (CSI) that involves receiving configuration information, measuring CSI-RS, and transmitting CSI with a precoding matrix, where the number of CSI-RS antenna ports is less than the number of antenna ports, and utilizing part of the antenna ports for CSI-RS transmission to optimize communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of transmitting antennas in base stations is increased, then throughput and spectral efficiency are improved, but the overhead of transmitting channel-state information reference signal (CSI-RS) is increased
Solution Approach 1:
The patent segments the antenna ports into two sets: a first set of antenna ports that transmit CSI-RS and a second set of antenna ports that do not transmit CSI-RS. This segmentation allows the system to obtain channel state information from only a subset of antennas, thereby reducing the overall CSI-RS overhead while still enabling effective precoding for all antenna ports. The channel state information obtained from the first set of antenna ports is then used to determine precoding matrices for both sets of antenna ports.
2Productivity
If the number of transmitting antennas in base stations is increased, then spectral efficiency is improved, but the overhead of transmitting channel-state information reference signal (CSI-RS) is increased
Solution Approach 1:
The patent segments the antenna ports into two sets: a first set of antenna ports that transmit CSI-RS and a second set of antenna ports that do not transmit CSI-RS. This segmentation allows the system to obtain channel state information from only a subset of antennas, thereby reducing the overall CSI-RS overhead while still enabling effective precoding for all antenna ports. The channel state information obtained from the first set of antenna ports is then used to determine precoding matrices for both sets of antenna ports.
3Adaptability or versatility
If different base stations have different numbers of transmitting antenna ports, then communication flexibility is improved, but the complexity of communicating efficiently is increased
Solution Approach 1:
The patent establishes a universal mechanism that works across base stations with different numbers of antenna ports. The terminal device is configured to receive CSI-RS from a first set of antenna ports and use this information to determine precoding matrices for both the first and second sets of antenna ports. This universal approach allows the terminal to efficiently communicate with base stations having varying numbers of antenna ports without requiring separate handling mechanisms for each configuration.
Data Source
AI summary
A method for transmitting channel state information, and a communication node and a storage medium are disclosed. The method may include, receiving configuration information sent by a second communication node; receiving CSI-RS sent by the second communication node according to the configuration information; measuring the CSI-RS to obtain the CSI, and transmitting the CSI to the second communication node; where the CSI may include a precoding matrix; the configuration information is indicative of a number of CSI-RS antenna ports and a number of antenna ports onto which the precoding matrix is expected to be applied; and the number of CSI-RS antenna ports is smaller than the number of antenna ports onto which the precoding matrix is expected to be applied.