CSI Feedback Using Power-Offset Precoding in Multi-TRP Links
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Solution Overview
Problem
In multi-station coordination systems, inaccurate channel state information (CSI) feedback due to varying TRP powers degrades transmission performance.
Innovation Solution
A method for determining CSI by a terminal that adjusts channel estimation using multiple power offsets associated with reference signal resources, enabling an accurate precoding matrix matching actual transmission conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-station coordination is used to improve throughput performance, then transmission capacity is improved, but CSI accuracy deteriorates due to different TRP powers
Solution Approach 1:
The patent introduces power offset parameters to adjust the channel estimation process. By changing the parameter representation to include power offset information (PC,n) for each TRP, the system can compensate for power differences and maintain accurate CSI feedback while using multi-station coordination for improved throughput.
2Device complexity
If channel estimation is performed without power offset adjustment, then processing complexity is reduced, but transmission performance deteriorates due to power mismatches
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing power offset parameters (PC,n) for each TRP before channel estimation. This allows the channel estimation process to directly use these pre-computed parameters without adding complex real-time calculations, thus maintaining low processing complexity while improving transmission performance through accurate power compensation.
3Measurement precision
If power offsets are considered in channel estimation, then CQI accuracy is improved, but calculation complexity increases
Solution Approach 1:
The patent changes the parameter representation by introducing power offset parameters (PC,n) that capture the power differences between TRPs. This parameter transformation simplifies the overall calculation by separating the power compensation aspect from the channel estimation, allowing accurate CQI calculation without proportionally increasing calculation complexity.
Solution Approach 2:
The power offset parameters are pre-determined and stored before the channel estimation and CQI calculation processes. This preliminary action eliminates the need for complex real-time power calculations during CQI determination, thus improving CQI accuracy while keeping the actual calculation complexity during operation low.
Data Source
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AI summary
This application provides a method for determining channel state information and an apparatus, relating to the field of communication technologies, to improve accuracy of 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 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.