CSI Feedback Using Power-Offset Precoding for Multi-TRP Channels
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Solution Overview
Problem
Inaccurate channel state information (CSI) feedback due to varying power levels among transmission and reception points (TRPs) in multi-station coordination systems, leading to degraded transmission performance.
Innovation Solution
A method for determining CSI by a terminal that involves receiving reference signals on multiple resources with associated power offsets, adjusting channels using these offsets, and calculating a precoding matrix to match actual transmission conditions, thereby improving CSI accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-station coordination is used to improve throughput performance, then system throughput and user experience are improved, but CSI accuracy deteriorates due to different TRP powers
Solution Approach 1:
The patent applies parameter changes by introducing power offset parameters to adjust the channel estimation process. Specifically, the terminal device applies different power offset values to channels from different TRPs during precoding matrix calculation, compensating for the power differences between TRPs and thereby improving CSI accuracy while maintaining multi-station coordination benefits
2Ease of operation
If CSI feedback is performed without power offset adjustment, then feedback process is simple, but transmission performance deteriorates due to inaccurate CQI
Solution Approach 1:
The patent applies preliminary action by pre-configuring power offset parameters from the network side before CSI feedback. The terminal device uses these pre-provided power offset values to adjust channel estimation results, ensuring accurate CQI calculation without adding complex real-time adjustment operations during the feedback process
3Measurement precision
If power offsets are applied to adjust channel estimation, then CSI accuracy is improved, but calculation complexity increases
Solution Approach 1:
The patent applies local quality by selectively applying power offset adjustments only to specific TRP channels that have power differences, rather than uniformly processing all channels. The terminal device identifies which TRPs require power compensation and applies offsets only to those, reducing unnecessary calculation overhead while improving CSI accuracy for affected TRPs
Data Source
AI summary
The present disclosure provides a method for determining channel state information and an apparatus, relating to the field of communication technologies, to improve accuracy of channel state information (CSI) fed back by a terminal. In the method, a terminal may determine, based on a plurality of reference signals on a plurality of reference signal resources and a plurality of power offsets, a precoding matrix that matches a channel for actual transmission, so that a channel quality indicator (CQI) obtained based on the precoding matrix conforms to channel quality of the channel for actual transmission. In other words, in this case, the terminal can obtain an accurate CQI, thereby improving accuracy of CSI fed back by the terminal to a network device, and improving transmission performance.