CSI Reporting Priority for Coherent Joint Transmission Feedback
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Solution Overview
Problem
The current CSI feedback mechanism in Rel-15˜Rel-17 standards cannot accurately reflect the true channel quality experienced by resource ports in coherent joint transmission (C-JT) schemes, leading to reduced accuracy and reliability of data scheduling and overall network throughput due to undefined CSI reporting priorities and unspecified bitwidths for Part I and Part II information.
Innovation Solution
Determine CSI reporting priority based on grouping information of channel state information part II (CSI part II) using M CSI-RS resources related to K CSI-RS resources, enabling accurate CSI demodulation and ensuring data transmission performance by omitting CSI parts according to defined priorities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current CSI feedback mechanism (Rel-15˜Rel-17 standards) is used for coherent joint transmission, then the feedback mechanism can be maintained simple and compatible with existing standards, but the accuracy and reliability of CSI reporting deteriorates because it cannot accurately reflect the true channel quality experienced by resource ports
Solution Approach 1:
The CSI part II reporting domain information is segmented into multiple groups based on the association between CSI-RS resources and transmission points. This segmentation allows the system to selectively report information for different TRPs, improving the accuracy of channel quality reflection while managing feedback complexity through structured organization of reporting elements.
2Loss of information
If all CSI part II reporting domain information is transmitted without grouping, then complete channel state information can be provided, but the overhead and complexity of CSI feedback increases significantly
Solution Approach 1:
CSI part II reporting domain information is divided into multiple groups according to the association relationship between CSI-RS resources and transmission points. This segmentation enables selective reporting based on priority and relevance, maintaining information completeness for critical TRPs while reducing overall feedback overhead through prioritized grouping.
Solution Approach 2:
The patent extracts and prioritizes essential CSI reporting elements by grouping them according to their association with specific transmission points. High-priority groups containing critical channel state information are transmitted first, while less critical information can be omitted or deferred, thereby reducing feedback overhead while preserving essential information completeness.
3Ease of operation
If CSI reporting priority is not defined, then the feedback mechanism remains simple, but the network device cannot correctly determine information omission when bit rate exceeds maximum configured bit rate
Solution Approach 1:
The patent establishes CSI reporting priorities and grouping relationships in advance, before actual CSI feedback transmission occurs. This preliminary configuration enables the network device and terminal equipment to pre-agree on which information groups have higher priority, ensuring that when bit rate constraints require information omission, the most critical channel state information is preserved while maintaining operational simplicity through pre-defined rules.
Data Source
AI summary
An apparatus for transmitting channel state information, applicable to a terminal equipment, includes: a receiver configured to receive first channel state information reference signal (CSI-RS) resource configuration transmitted by a network device, the first CSI-RS resource configuration at least comprising a first resource set, the first resource set comprising K CSI-RS resources (K is a natural number greater than or equal to 2); and processor circuitry configured to: determine a CSI reporting priority at least based on grouping information of reporting domain information of channel state information part II (CSI part II), the grouping information being determined based on M CSI-RS resources (M is a natural number less than or equal to the K) related to the K CSI-RS resources, the grouping information including first group (G0) information, second group (G1) information, and third group (G2) information, and generate CSI at least according to the CSI reporting priority.