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.
Innovation Solution
Implementing CSI reporting priorities based on first and second CSI part I reporting domain information to determine CSI-RS resource selection and spatial domain beam selection, ensuring accurate and complete CSI measurement reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the current CSI feedback mechanism in Rel-15 to Rel-17 standards is used, then the feedback process is simple and compatible with existing systems, but the CSI feedback cannot accurately reflect the true channel quality in coherent joint transmission schemes, leading to reduced scheduling accuracy and network throughput
Solution Approach 1:
The patent segments the CSI feedback mechanism into multiple priority levels (first priority, second priority, etc.) for different CSI reporting domains. This segmentation allows the system to selectively prioritize and feedback critical CSI information first, ensuring accurate channel quality reflection for coherent joint transmission while maintaining compatibility with existing systems through hierarchical reporting structures.
2Reliability
If CSI reporting priorities are implemented based on multiple CSI part I reporting domain information, then the accuracy and completeness of CSI measurement reporting is improved, but the device complexity and processing overhead increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring priority relationships between different CSI reporting domains before actual CSI feedback occurs. The network device and terminal device establish priority rules in advance, so when CSI feedback is needed, the terminal can automatically determine which CSI information to prioritize without complex real-time decision-making, thus improving reliability while controlling processing complexity.
Solution Approach 2:
The patent changes the parameter of CSI reporting from a single uniform feedback mechanism to a multi-priority hierarchical structure. By introducing priority levels as a new parameter dimension, the system can differentiate between critical and non-critical CSI information, improving reporting accuracy through selective prioritization while managing device complexity through structured parameter organization.
3Measurement precision
If multiple CSI-RS resources are configured for joint channel measurement, then the channel measurement capability is enhanced, but the overhead and resource consumption increase
Solution Approach 1:
The patent applies local quality by assigning different priority levels to different CSI-RS resources based on their specific roles and importance in coherent joint transmission. Instead of treating all CSI-RS resources equally, the system provides differentiated quality of service to each resource, allowing critical measurement resources to consume more overhead while less critical resources use minimal overhead, thus enhancing overall measurement capability efficiently.
Data Source
AI summary
An apparatus for transmitting channel state information, applicable to a terminal equipment, includes: a first receiver configured to receive first channel state information reference signal (CSI-RS) resource configuration from 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, where, K is a natural number greater than or equal to 2; and first processor circuitry configured to determine an order at least based on first channel state information part I (CSI part I) reporting domain information and/or second CSI part I reporting domain information, the first CSI part I reporting domain information being used to select M CSI-RS resource within K CSI-RS resource, and the second CSI part I reporting domain information being used to determine a combination of spatial domain beams across M or K CSI-RS resource, 1<M≤K, M is a natural number.