Terminal CSI Bit Mapping for Multi-TRP Joint Transmission
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Solution Overview
Problem
Existing radio communication systems, particularly in next-generation mobile communication systems like 5G and beyond, lack a clear definition for channel state information (CSI) and codebook configurations in coherent joint transmission (CJT) scenarios involving multiple transmission/reception points (TRPs) or panels, leading to potential communication throughput and quality degradation.
Innovation Solution
A terminal and base station system that determines appropriate CSI/codebook configurations by receiving and processing information for multiple transmission points, considering factors such as transmission points, layers, and indicators within the CSI, to enhance reporting accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CSI/codebook configuration is not clearly defined for multi-TRP CJT, then system complexity is reduced, but communication throughput and quality deteriorate
Solution Approach 1:
The patent segments the CSI report into multiple parts (CSI part 1 and CSI part 2) with different functionalities. CSI part 1 contains essential information for multi-TRP identification and basic channel state, while CSI part 2 contains detailed precoding matrix information. This segmentation allows the system to maintain clear definitions for throughput optimization while managing configuration complexity through structured organization.
Solution Approach 2:
The patent introduces a new dimension to CSI reporting by adding TRP-specific indicators (CRI, PMI, CQI) that identify different transmission points. This dimensional expansion allows the system to distinguish between multiple TRPs in the CSI report structure, enabling clear definition of configurations for multi-TRP CJT scenarios without overwhelming complexity.
2Measurement precision
If detailed CSI indicators are configured for each transmission point, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent divides CSI measurement and reporting into distinct segments for each TRP. Each TRP has its own set of indicators (CRI for TRP identification, PMI for precoding, CQI for quality), allowing precise measurement of channel conditions per transmission point while organizing the complexity into manageable, structured components.
Solution Approach 2:
The patent applies local quality by configuring CSI indicators specifically tailored to each TRP's characteristics. Different TRPs can have different numbers of antenna ports, different precoding configurations, and different measurement requirements, allowing the system to optimize measurement precision for each local TRP scenario rather than using a uniform complex configuration for all.
3Reliability
If multi-TRP CJT is implemented without clear CSI definition, then system adaptability is maintained, but communication quality deteriorates
Solution Approach 1:
The patent adds TRP identification dimensions to the CSI report structure through CRI (CSI-RS Resource Indicator) fields that specifically identify which TRP each measurement corresponds to. This dimensional addition enables clear definition of multi-TRP configurations, allowing the system to maintain reliability and communication quality by properly associating CSI measurements with their respective transmission points.
Solution Approach 2:
The patent uses a copying approach where the CSI report structure is replicated for each TRP with appropriate modifications. Each TRP has its own set of indicators (CRI, PMI, CQI) that follow a consistent pattern, allowing clear definition of configurations across multiple TRPs while maintaining system adaptability through the standardized yet configurable structure.
Data Source
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AI summary
A terminal according to one aspect of the present disclosure includes a receiving section that receives a configuration of a report of channel state information (CSI) for a plurality of transmission points, and a control section that determines a position and a bit-width for a plurality of indicators in the CSI, in accordance with at least one of a transmission point, a layer, an indicator in the CSI, and the number of the plurality of transmission points.