Multi-TRP CSI Reporting With Type-II Codebook Compression
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Solution Overview
Problem
In wireless communication systems with multiple transmit/receive points, excessive control signaling and large CSI feedback overhead occur due to the need for distinct reports for each transmission configuration, particularly with NR Type-II codebooks, leading to inefficiencies in channel state information reporting.
Innovation Solution
Implement methods and apparatus for channel state information reporting that reduce CSI reporting overhead by optimizing CSI feedback, prioritizing multi-TRP transmission hypotheses with higher spectral efficiency and applying spatial and frequency domain compression techniques to the NR Type-II codebook.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If distinct CSI reports are generated for each transmission configuration in multi-TRP scenarios, then measurement precision is improved, but feedback overhead increases excessively
Solution Approach 1:
The patent combines multiple transmission hypotheses into a single unified CSI report structure. Instead of generating separate reports for each TRP configuration, the system merges the CSI information for multiple hypotheses (including different TRP combinations and transmission schemes) into one consolidated report, thereby reducing feedback overhead while preserving measurement precision for all hypotheses.
Solution Approach 2:
The CSI report structure is designed to serve multiple functions simultaneously - it can report CSI for single-TRP transmissions, multi-TRP joint transmissions, and coordinated transmissions within a single unified framework. This multi-functional report structure eliminates the need for separate reporting mechanisms for different transmission configurations.
2Adaptability or versatility
If comprehensive CSI reporting for all transmission hypotheses is implemented, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements dynamic CSI reporting where the UE can adaptively select and report only the most relevant transmission hypotheses based on current channel conditions. The reporting mechanism dynamically adjusts which hypotheses are included and their priority levels, rather than statically reporting all possible configurations, thereby reducing complexity while maintaining adaptability.
Solution Approach 2:
The system changes the parameter of CSI report quantity and content based on transmission conditions. By dynamically adjusting which CSI parameters are reported for which hypotheses (e.g., reporting full CSI for high-priority hypotheses and compressed CSI for lower-priority ones), the system achieves adaptability without proportional increase in complexity.
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, at a UE, one or more channel state information reporting configurations associated with multiple transmission/reception points reporting for a mobile wireless communication network. The transceiver receives, at the UE, one or more CSI reference signals from the mobile wireless communication network, the one or more CSI-RSs configured for at least one of channel measurement and interference measurement. In one embodiment, the transceiver transmits, from the UE, one or more CSI reports corresponding to one or more transmission hypotheses based on the at least one of channel measurements and interference measurements, each CSI report comprising one or more precoding matrix indicators and one or more rank indicators.