CSI Reporting for Single-DCI Multi-TRP Reliability
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Solution Overview
Problem
Existing 5G networks face challenges in supporting diverse use cases due to insufficient support for multiple transmission and reception points (mTRPs), leading to poor coverage and reliability for cell-edge users, especially in scenarios involving ultra-reliable low-latency communications and high carrier frequencies.
Innovation Solution
Implementing channel state information (CSI) enhancement for single and multiple TRP operations, including dynamic CMR resource configuration, CSI report priority enhancement, and CSI compression, facilitated by MAC-CE signaling for faster updates and shared CSI report quantities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple transmission and reception points (mTRPs) are deployed to improve coverage and reliability for cell-edge users, then the signal reception quality and network reliability are improved, but the system complexity and coordination overhead increase
Solution Approach 1:
The patent segments the channel state information reporting into multiple independent CSI reports, each corresponding to a specific TRP. This allows the UE to report channel quality for each TRP separately, enabling the network to make independent scheduling decisions for each TRP while reducing the complexity of coordinating multiple TRPs as a single unit.
Solution Approach 2:
The patent introduces a new dimension of TRP identification in CSI reporting by including a TRP indicator field that identifies which TRP the CSI report corresponds to. This dimensional addition allows the system to handle multiple TRPs independently without increasing coordination overhead, as each CSI report is clearly associated with its source TRP.
2Adaptability or versatility
If dynamic CMR resource configuration is implemented to enable flexible TRP switching and adaptation, then the adaptability and response speed to channel changes are improved, but the signaling overhead and processing complexity increase
Solution Approach 1:
The patent pre-configures multiple CMR resources corresponding to different TRPs before actual TRP switching is needed. The network provides the UE with a set of pre-defined CMR resources that can be quickly activated or deactivated based on channel conditions, eliminating the need for dynamic reconfiguration signaling during TRP switching operations.
Solution Approach 2:
The patent implements dynamic selection of CMR resources from a pre-configured set based on current channel conditions and TRP status. The UE can dynamically switch between different CMR resources corresponding to different TRPs without requiring dynamic reconfiguration signaling, achieving flexibility while minimizing overhead.
3Measurement precision
If comprehensive CSI reporting for all TRPs is performed to provide detailed channel state information, then the measurement precision and scheduling accuracy are improved, but the reporting payload size and processing burden increase
Solution Approach 1:
The patent extracts only the essential and differentiated information from complete CSI reports for each TRP. Instead of reporting full CSI matrices for all TRPs, the system reports key parameters such as CQI, PMI, and RI for each TRP along with a TRP identifier, removing redundant information while maintaining scheduling accuracy.
Solution Approach 2:
The patent implements partial CSI reporting where only the most critical channel state parameters are reported for each TRP based on current channel conditions. When channel conditions are stable, reporting can be reduced to essential parameters only, while more detailed reporting is triggered only when channel changes exceed certain thresholds.
Data Source
AI summary
A user equipment (UE), baseband processor or other network device (e.g., base station, next generation NodeB, etc.) can operate to process or generate CSI reports based on a CSI report configuration for a single transmission and reception point (sTRP) operation and a multiple TRP (mTRP) operation. The CSI report can be configured based on a plurality of weighted CSI report priority variables, wherein the plurality of weighted CSI report priority variables comprises measurements associated the sTRP operation and measurements associated with the mTRP operation, and the measurements associated with the sTRP operation are configured with a different priority than the measurements associated with the mTRP operation.