Multi-TRP PMI Feedback Segmentation for Lower CSI Overhead
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Solution Overview
Problem
Existing wireless communication systems face significant overhead in transmitting high-resolution channel state information (CSI) feedback for multiple transmission-reception points (TRPs), which can hinder efficient beamforming and communication performance.
Innovation Solution
A mechanism to control the payload size of CSI reporting by configuring thresholds for spatial and frequency domain components and precoding matrix coefficients, allowing high-resolution precoding matrix indication (PMI) feedback with minimal overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution CSI feedback is transmitted for multiple TRPs, then beamforming quality and communication performance are improved, but communication overhead increases significantly
Solution Approach 1:
The CSI feedback for multiple TRPs is segmented into separate reporting structures. Each TRP's CSI feedback is independently structured with TRP-specific identifiers, allowing the network to selectively process and combine only the necessary components rather than transmitting all possible high-resolution data for all TRPs simultaneously.
Solution Approach 2:
The patent introduces a new dimension in CSI reporting by adding TRP-specific identifiers and layered reporting structures. Instead of flat high-resolution feedback, the system organizes CSI data across multiple dimensions (TRP identity, spatial domain, frequency domain), enabling efficient compression and selective reporting that reduces overhead while preserving essential high-resolution information.
2Manufacturing precision
If high-resolution PMI feedback is reported for all TRPs, then precoding accuracy is improved, but payload size and processing complexity increase
Solution Approach 1:
The precoding matrix indication (PMI) feedback is segmented by TRP, with each TRP having its own PMI reporting structure. This segmentation allows the UE to calculate and report precoding information for each TRP independently using separate reference signals, reducing the complexity of calculating a single complex combined precoder while maintaining overall precoding accuracy through coordinated multi-TRP operation.
Solution Approach 2:
The network configures the UE with reference signals and reporting parameters in advance before actual CSI feedback is needed. This preliminary configuration includes TRP-specific reference signal resources, codebook configurations, and reporting format definitions, which simplifies the real-time feedback process by pre-establishing the computational framework and reducing on-the-fly processing complexity.
Data Source
AI summary
Wireless communications systems and methods related to multi-transmission-reception point (multi-TRP) precoding matrix indication (PMI) operations are provided. A user equipment (UE) receives a configuration indicating a precoder size parameter for a plurality of transmission-reception points (TRPs). The UE receives, from a first TRP of the plurality of TRPs, a first reference signal. The UE receives, from a second TRP of the plurality of TRPs, a second reference signal, the second TRP being different from first TRP. The UE transmits, to the first TRP or the second TRP, a channel state information (CSI) report including a first feedback component based on the first reference signal and a second feedback component based on the second reference signal, where a combined payload size of the first feedback component and the second feedback component is based on the precoder size parameter.