CSI Feedback Configuration for Multi-TRP Wireless Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing channel state information (CSI) feedback, particularly in multi-transmission point (TRP) scenarios, which leads to increased overhead and limitations in dynamic switching between single TRP and non-coherent joint transmission (NC-JT) or Ultra Reliable Low Latency Communication (URLLC).
Innovation Solution
The proposed solution configures a wireless device (WD) with a single CSI report setting that can handle both single TRP transmission and NC-JT or URLLC scenarios, allowing for dynamic switching with reduced CSI feedback overhead. This is achieved by selecting and reporting only the necessary CSI feedback based on conditions such as rank thresholds and data throughput estimates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple CSI report settings are configured to support both single TRP and multi-TRP transmission, then transmission versatility is improved, but CSI feedback overhead increases
Solution Approach 1:
The patent configures a single CSI report setting that can serve multiple transmission modes (single TRP and multi-TRP) through dynamic hypothesis generation. The WD generates different CSI hypotheses (single TRP hypothesis and multi-TRP hypothesis) based on the same CSI report setting, allowing the system to support multiple transmission scenarios without requiring separate configurations for each mode.
Solution Approach 2:
The system dynamically selects which CSI hypothesis to report based on current transmission conditions. The network can request either single TRP CSI or multi-TRP CSI feedback from the same configured report setting, enabling flexible adaptation to different transmission scenarios without static pre-configuration for each mode.
2Reliability
If separate CSI report settings are used for single TRP and multi-TRP transmission, then transmission reliability is improved, but device complexity increases
Solution Approach 1:
A single CSI report setting is designed to handle both single TRP and multi-TRP transmission scenarios. The WD generates multiple CSI hypotheses (single TRP hypothesis with first CSI and multi-TRP hypothesis with second CSI) from the same configuration, eliminating the need for separate CSI report settings for different transmission modes while maintaining reliability for both scenarios.
3Measurement precision
If comprehensive CSI feedback for all TRPs is reported, then measurement precision is improved, but information loss increases due to feedback overhead
Solution Approach 1:
The system extracts only the necessary CSI information based on current transmission needs. When single TRP transmission is requested, only the first CSI (single TRP hypothesis) is reported. When multi-TRP transmission is requested, only the second CSI (multi-TRP hypothesis) is reported. This selective extraction avoids reporting unnecessary CSI data while maintaining measurement precision for the active transmission mode.
Data Source
AI summary
Methods and apparatuses are disclosed for low overhead CSI feedback for multi-trp transmissions. In one embodiment, a method implemented in a wireless device includes receiving a configuration of a channel state information, CSI, report setting for at least K>1 non-zero power channel state information reference signal, NZP CSI-RS, resources for channel measurement and a report quantity configuration, K being an integer; receiving a CSI feedback report request for CSI measurement and feedback based at least in part on the CSI report setting; measuring channels based at least in part on the NZP CSI-RS resources; and sending a channel state information, CSI, feedback report based at least in part on: the channel measurements; and the report quantity configuration; and the CSI feedback report comprising at least one of a first CSI feedback and a second CSI feedback.