Terminal CSI Reporting for Multi-Panel Type 2 Codebooks
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Solution Overview
Problem
Existing radio communication systems, such as NR, lack a clear definition for channel state information (CSI) and codebook enhancements, which can lead to deteriorated communication throughput and quality, particularly in multi-panel and multi-TRP scenarios.
Innovation Solution
A terminal and base station are designed to receive and control CSI reports based on a type 2 codebook, utilizing multiple channel state information reference signals from multiple panels, with selected indices corresponding to spatial domain bases, to enhance CSI reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CSI reporting is enhanced for multi-panel and multi-TRP scenarios, then communication quality and throughput are improved, but the complexity of CSI codebook and measurement procedures increases
Solution Approach 1:
The patent segments the CSI reporting procedure into distinct components: separate codebook definitions for single-panel and multi-panel scenarios, distinct measurement procedures for different TRP configurations, and modular CSI report structures. This segmentation allows the system to handle complex multi-panel and multi-TRP scenarios by combining simpler, pre-defined segments rather than requiring entirely new complex procedures.
Solution Approach 2:
The patent employs parameter changes by introducing a codebook mode indicator that switches between different codebook types (single-panel vs. multi-panel, single-TRP vs. multi-TRP). The system changes measurement parameters and reporting formats based on the detected scenario type, allowing the same terminal to adapt its CSI reporting behavior to match the current communication environment without requiring separate hardware or complex fixed procedures for each scenario.
2Reliability
If a comprehensive CSI codebook is defined for all multi-panel and multi-TRP scenarios, then communication quality is improved, but the overhead for CSI reporting increases
Solution Approach 1:
The patent implements dynamic CSI reporting by first detecting the current communication scenario (single-panel/single-TRP, single-panel/multi-TRP, or multi-panel/single-TRP) and then dynamically selecting the appropriate codebook and measurement procedure. This dynamic adaptation ensures that the terminal uses the minimal necessary overhead for the current scenario rather than always using the most comprehensive reporting format, thereby reducing unnecessary information transmission while maintaining communication quality.
Solution Approach 2:
The patent uses codebook copying and reuse strategies where the same codebook structures and measurement procedures developed for simpler single-panel scenarios are copied and adapted for multi-panel scenarios. Instead of creating entirely new codebooks for each scenario, the system reuses and modifies existing codebook definitions, reducing the overall information overhead while maintaining comprehensive coverage of all possible scenarios.
Data Source
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Figure 3A~3B
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) based on a type 2 codebook, and a control section that controls transmission of the report based on measurement of a plurality of channel state information reference signals (CSI-RSs) from a plurality of panels, based on the configuration. The report includes a plurality of indices respectively corresponding to the plurality of panels. The plurality of indices respectively correspond to a plurality of spatial domain bases. One or more indices of the plurality of indices correspond to one or more panels of the plurality of panels. The one or more indices are selected from a part of a set of the spatial domain bases.