CSI-RS Resource Selection for Multi-TRP Precoding
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Solution Overview
Problem
The challenge lies in efficiently supporting channel state information (CSI) for a wide range of antenna configurations in wireless communication systems, particularly in next-generation mobile wireless communication systems like 5G New Radio (NR), while avoiding the need to specify separate CSI feedback formats for each unique antenna configuration.
Innovation Solution
A user equipment (UE) is configured to measure and report CSI on multiple CSI-RS resources, each associated with a separate transmit/receive point or antenna panel, allowing for the selection of a preferred precoder matrix for each resource, even when layers from different resources interfere, under a non-coherent joint transmission assumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate CSI feedback formats are specified for each antenna configuration, then measurement precision and reliability are improved, but device complexity and ease of manufacture deteriorate
Solution Approach 1:
The patent applies universality by designing a single unified CSI feedback format that can accommodate multiple antenna configurations (single TRP, multi-TRP, single panel, multi-panel) without requiring separate feedback formats for each case. The feedback mechanism universally handles different transmission points and antenna panels through a standardized structure, eliminating the need for configuration-specific feedback formats while maintaining measurement precision across all scenarios
2Adaptability or versatility
If multiple CSI-RS resources are measured and reported, then adaptability to various antenna deployments is improved, but loss of time and productivity deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple CSI-RS resources at different transmission points or antenna panels before actual communication occurs. The UE is configured with these resources in advance, allowing it to measure and report CSI for multiple antenna configurations simultaneously without requiring time-consuming setup procedures during active communication. This enables the system to adapt to various antenna deployments while minimizing time loss through advance preparation
Data Source
AI summary
According to some embodiments, a method is performed by a user equipment for reporting channel state information. The user equipment is configured with two or more channel state information reference signal, CSI-RS, resources in a CSI-RS resource set. The method comprises: selecting at least two CSI-RS resources from the CSI-RS resource set, wherein each of the at least two selected CSI-RS resources are associated to a set of spatially multiplexed layers, wherein different sets comprise different layers; determining a preferred precoder matrix for the selected CSI-RS resources; and transmitting a CSI report indicating the selected CSI-RS resources and the preferred precoder matrices. The method may further comprise calculating a channel estimate for the selected CSI-RS resources, and determining a channel quality indicator, CQI, corresponding to a hypothetical transmission from a plurality of effective channels where layers transmitted through the effective channels mutually interfere. The CSI report may indicate the determined CQI for the selected CSI-RS resources.