Multi-TRP CSI Reporting With Reduced Type-II Feedback Overhead
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Solution Overview
Problem
In 5G wireless communication systems, the excessive control signaling and large amount of channel state information (CSI) feedback required for multiple transmit/receive points (TRPs) lead to inefficiencies, particularly with NR Type-II codebooks, where the number of Precoding Matrix Indicator (PMI) bits can exceed 1000 bits, even for single-point transmission.
Innovation Solution
Implement procedures for channel state information reporting that reduce CSI reporting overhead by jointly designing CSI feedback for different transmission configurations, applying spatial and frequency domain compressions, and modifying partial CSI omission priorities to favor multi-TRP transmission hypotheses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Type-II codebooks are used for CSI reporting in multi-TRP scenarios, then transmission performance is improved, but CSI reporting overhead increases excessively (PMI bits exceeding 1000 bits)
Solution Approach 1:
The patent segments the CSI reporting process by introducing separate reporting mechanisms for single-TRP and multi-TRP scenarios. Different codebook types (Type-I and Type-II) are selectively applied based on the transmission scenario, allowing the system to maintain high transmission performance for multi-TRP while controlling overhead by using Type-I for single-TRP cases.
Solution Approach 2:
The patent applies partial action by selectively using Type-II codebooks only when necessary (multi-TRP scenarios with multiple TCI states) rather than universally. This partial application of the high-performance but high-overhead codebook type resolves the contradiction by limiting Type-II usage to scenarios where it provides necessary performance benefits.
2Measurement precision
If separate CSI reporting is implemented for each transmission configuration, then transmission accuracy is improved, but control signaling overhead increases
Solution Approach 1:
The patent creates a universal CSI reporting framework that handles both single-TRP and multi-TRP scenarios through a unified process. The same reporting mechanism adapts its behavior based on the number of TCI states, eliminating the need for completely separate reporting procedures while maintaining accuracy for each scenario.
Solution Approach 2:
The patent introduces dynamic selection of codebook types and reporting parameters based on the transmission scenario. The system dynamically adjusts between Type-I and Type-II codebooks, and modifies reporting content based on whether single-TRP or multi-TRP transmission is configured, optimizing the balance between accuracy and overhead for each specific case.
3Reliability
If full CSI feedback is reported for all TRPs, then system performance is maintained, but reporting efficiency decreases
Solution Approach 1:
The patent extracts and reports only the essential CSI parameters needed for each TRP scenario. By identifying and reporting only the critical components (such as CRI, PMI, CQI, and RI selectively), the system maintains necessary performance while eliminating redundant feedback, thereby improving reporting efficiency.
Solution Approach 2:
The patent changes the parameters being reported based on the transmission scenario. Different sets of CSI parameters are reported for single-TRP versus multi-TRP cases, and the granularity of feedback is adjusted according to the number of TCI states configured, optimizing the balance between performance maintenance and reporting efficiency.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for channel state information reporting for multiple transmit/receive points. One apparatus includes a transceiver that receives an indication from a mobile wireless communication net-work that channel state information (“CSI”) corresponding to multiple transmit/receives points (“TRPs”) is to be reported and a processor that generates at least one CSI report according to the CSI reporting configuration, the at least one CSI report comprising a CSI-reference signal (“CSI-RS”) resource indicator (“CRI”), wherein the transceiver reports the at least one CSI report comprising the CRI to the mobile wireless communication network.