UE CSI Reporting With Phase Continuity for TDCP Measurements
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Solution Overview
Problem
New radio (NR) has not adequately exploited the channel time domain correlation, and existing wireless communication systems lack detailed reporting of time domain channel properties, which are crucial for advanced channel state information (CSI) feedback, particularly for high/medium UE velocities, impacting DL precoding and MIMO enhancements.
Innovation Solution
Designs for UE CSI reporting of time domain channel properties (TDCP) using Tracking Reference Signals (TRS), incorporating Uplink Control Information (UCI) multiplexing, UCI omission, Interference Measurement Resource (IMR) configuration, and phase continuity handling to support accurate TDCP measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phase continuity is not handled during duplex direction changes, then UE can switch between transmission and reception modes freely, but TDCP measurement accuracy deteriorates due to phase interruptions
Solution Approach 1:
The UE determines whether phase continuity is interrupted by a duplex direction change before performing TDCP measurements. By checking the timing relationship between CSI-RS resources and duplex direction changes in advance, the UE can identify valid CSI-RS resources for measurement, preventing phase interruption issues from degrading measurement accuracy.
Solution Approach 2:
The TRS set is divided into multiple CSI-RS resources, and the UE evaluates each resource individually to determine if it is valid for TDCP measurement based on phase continuity. This segmentation allows selective use of valid resources while excluding those affected by duplex direction changes, maintaining measurement accuracy without requiring complete measurement sets.
2Measurement precision
If detailed TDCP reporting is implemented, then DL precoding and MIMO enhancements are improved, but signaling overhead and processing complexity increase
Solution Approach 1:
The UE reports TDCP measurements selectively based on local conditions - specifically, only for valid CSI-RS resources where phase continuity was not interrupted. This local quality approach provides detailed channel state information where measurements are reliable, while avoiding unnecessary reporting for invalid resources, thus balancing precision with complexity.
Solution Approach 2:
Instead of reporting all TDCP measurements uniformly, the UE performs partial reporting by including only those measurements from valid CSI-RS resources. This partial action approach provides sufficient channel state information for DL precoding and MIMO enhancements without the excessive signaling overhead of complete reporting.
3Productivity
If TDCP measurements are performed without validating phase continuity, then measurement coverage is maximized, but measurement reliability deteriorates due to phase interruptions
Solution Approach 1:
The UE autonomously determines the validity of each CSI-RS resource for TDCP measurement by self-evaluating whether phase continuity is interrupted by duplex direction changes. This self-service mechanism allows the UE to identify and exclude invalid measurements, ensuring measurement reliability while maintaining coverage through selective validation.
Solution Approach 2:
The system implements feedback by having the UE report which CSI-RS resources are valid for TDCP measurement based on phase continuity assessment. This feedback mechanism allows the network to understand which measurements are reliable, enabling effective use of TDCP data for DL precoding and MIMO while maintaining measurement coverage.
Data Source
AI summary
Systems and methods are provided for to support user equipment (UE) channel state information (CSI) report of time domain channel properties. Embodiments of a UE herein may receive, from a network node, a CSI report configuration (CSI-ReportConfig). The CSI-ReportConfig may comprise details regarding measurement and reporting of time domain channel properties (TDCP) based on a CSI reference signal (CSI-RS) for tracking reference signal (TRS). The UE may determine invalid CSI-RS resources and valid CSI-RS resources based on a timing of a duplex direction change. The UE may measure and report TDCP based on the valid CSI-RS resources.