CSI Beam Selection Across TRPs for Lower CJT Report Overhead
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing channel state information (CSI) reports for coherent joint transmission (CJT) from multiple transmission reception points (TRPs), leading to increased overhead and suboptimal performance.
Innovation Solution
The proposed solution involves configuring a CSI report that indicates a beam selection of one or more selected beams across all TRPs, independent of the TRPs indicated in the CSI report, thereby reducing the overhead associated with indicating TRP selection and spatial domain basis selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional CSI report configuration is used for CJT with multiple TRPs, then TRP selection and spatial domain basis selection can be indicated, but the overhead increases and performance becomes suboptimal
Solution Approach 1:
The patent merges the TRP selection indication and spatial domain basis selection into a unified CSI report structure. The beam selection indication field simultaneously conveys both TRP selection and spatial domain basis information, eliminating the need for separate indication fields and reducing overall overhead while maintaining CJT performance.
Solution Approach 2:
The beam selection indication field is designed to serve multiple functions: it indicates both the selected TRPs and the spatial domain bases simultaneously. This multi-functional field replaces what would traditionally require separate fields, reducing overhead while preserving the ability to configure CJT accurately.
2Loss of information
If separate indication fields for TRP selection and spatial domain basis selection are used, then complete information can be conveyed, but the CSI report size increases
Solution Approach 1:
The patent combines multiple information elements (TRP selection and spatial domain basis selection) into a single beam selection indication field. This merging approach maintains information completeness by encoding both TRP and basis selection within the unified field structure, while reducing the total number of bits required in the CSI report.
Solution Approach 2:
The patent utilizes a multi-dimensional encoding approach where the beam selection indication field operates in a higher-dimensional space to represent both TRP selection and spatial domain basis selection simultaneously. This allows efficient packing of multiple information elements into a compact representation, reducing report size without losing information.
Data Source
AI summary
Apparatus, methods, and computer-readable media for facilitating exploiting indication redundancy between transmission reception point selection and spatial domain basis selection are disclosed herein. An example method for wireless communication at a user equipment includes receiving a configuration configuring a channel state information (CSI) report associated with coherent joint transmission (CJT) with multiple transmission reception points (TRPs). The example method also includes receiving a CSI reference signal (CSI-RS). The example method also includes transmitting the CSI report based on measurements performed on the CSI-RS, the CSI report based on the configuration, the CSI report indicating a beam selection of one or more selected beams of the multiple TRPs, the beam selection indicating a total number of selected beams, and the total number of selected beams is across all TRPs of the multiple TRPs and is irrespective of selected TRPs indicated in the CSI report.