CRI-Based CSI Reporting With Differential CQI Signaling
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Solution Overview
Problem
Existing 5G communication systems face challenges in efficiently configuring and reporting channel state information (CSI) due to the increasing complexity of network connections and the need for enhanced performance in high-frequency bands, particularly in mmWave and terahertz bands, which affect data transmission rates and latency.
Innovation Solution
The method involves configuring user equipment (UE) to report multiple sets of CSI quantities, including cri-RI-PMI-CQI-LI, in a differential manner, based on network configurations, using NR channel state information reference signal (CSI-RS) resources, to enhance CSI reporting accuracy and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sets of CSI quantities are reported for multiple CRIs, then CSI reporting accuracy is improved, but uplink signaling overhead increases
Solution Approach 1:
The patent extracts and reports only the differential part of CQI values relative to a reference CRI, rather than reporting complete CQI values for all CRIs. This reduces the uplink signaling overhead while maintaining CSI reporting accuracy by reporting only the essential differential information.
Solution Approach 2:
The patent changes the reporting parameter from absolute CQI values to differential CQI values. By reporting CQI differences relative to a reference CRI instead of complete CQI values, the signaling overhead is reduced while the essential channel state information is preserved.
2Quantity of substance
If differential CQI reporting is used, then uplink signaling overhead is reduced, but processing complexity increases
Solution Approach 1:
The patent performs preliminary selection of a reference CRI based on RSRP measurements before differential CQI reporting. By pre-determining the reference CRI and preparing the differential values in advance, the processing complexity is managed systematically while achieving reduced signaling overhead.
Solution Approach 2:
The UE autonomously selects the reference CRI based on RSRP measurements and independently calculates differential CQI values without requiring explicit network configuration for each CRI. This self-service approach reduces processing complexity by eliminating the need for complex network-side coordination.
3Measurement precision
If network configures multiple CSI-RS resources, then channel measurement accuracy is improved, but system complexity increases
Solution Approach 1:
The patent segments the CSI-RS resources into multiple independent configurations, each associated with a specific CRI. This segmentation allows the network to configure multiple CSI-RS resources for improved channel measurement accuracy while managing system complexity through structured, modular resource organization.
Solution Approach 2:
The patent creates a universal framework where multiple CSI-RS resources can be configured and managed through a standardized procedure. Each CSI-RS resource serves multiple purposes: channel measurement, CRI identification, and reference for differential CQI reporting, thereby managing system complexity through multi-functionality.
Data Source
AI summary
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. A method performed by a user equipment (UE) in a communication system is provided. The method comprises receiving, from a base station, information for NR channel state information reference signal (CSI-RS) resources, identifying N sets of report quantities associated with N CSI-RS resources, where N≤NR, identifying a channel state information (CSI) report including the N sets of report quantities, and transmitting the CSI report to the base station.