Joint CSI Report for UL Panel Selection and Interference Reduction
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently reporting channel state information (CSI) for both downlink (DL) and uplink (UL) beam measurements, particularly due to hardware processing limitations and the need for accurate UL panel selection to mitigate interference and ensure maximum permissible exposure compliance.
Innovation Solution
A method and apparatus for a user equipment (UE) and base station (BS) to transmit and receive a joint CSI report, including DL and UL metrics, with the UE measuring CSI reference signals to estimate UL channel conditions and reporting capabilities to support efficient CPU resource utilization and UL panel selection by the BS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE reports separate DL and UL CSI metrics in separate reports, then the reporting accuracy is maintained, but the signaling overhead and processing complexity increase
Solution Approach 1:
The patent combines separate DL and UL CSI reports into a single joint CSI report, merging multiple reporting streams into one unified structure. This reduces signaling overhead and processing complexity while maintaining the accuracy of individual DL and UL metrics by including all necessary components (DL metrics, UL metrics, and panel ID associations) within the consolidated report framework.
Solution Approach 2:
The joint CSI report structure serves multiple functions simultaneously: it reports DL channel state information, UL channel state information, and panel identification associations all in one report. This multi-functional approach eliminates the need for separate reporting mechanisms while preserving the precision of each individual metric type.
2Measurement precision
If the UE measures and reports UL metrics for multiple panel sets, then the BS can make more accurate panel selection decisions, but the CPU processing load increases
Solution Approach 1:
The UE performs UL metric measurements for multiple panel sets in advance and includes these pre-computed metrics in the joint CSI report. By preparing these measurements beforehand rather than computing them on-demand at the BS, the UE shifts processing load to periods when the device is already active for measurement, and enables the BS to make accurate panel selection decisions without incurring additional real-time processing energy costs.
3Productivity
If the system uses multiple UL panels for transmission, then the data rate increases, but the interference and exposure risk increase
Solution Approach 1:
The joint CSI report provides the BS with comprehensive feedback including UL metrics and panel ID associations for multiple panel sets. This feedback enables the BS to make informed panel selection decisions that balance data rate requirements against interference and exposure constraints. The BS can select from multiple reported panel options, choosing configurations that achieve high throughput while respecting regulatory exposure limits and minimizing interference to other users.
Data Source
AI summary
This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for a user equipment (UE) to transmit a joint channel state information (CSI) report for both uplink beams and downlink beams and for a base station (BS) to receive the joint CSI report. The BS may configure the UE to measure metrics based on CSI reference signals (RS) or synchronization signal blocks (SSB). The UE may measure the CSI-RS or SSB to determine CSI metrics including at least one downlink metric and at least one uplink metric for at least one set of uplink panel identifiers (IDs). The UE may transmit the joint CSI report including the at least one downlink metric, the at least one uplink metric, and the set of uplink panel IDs associated with the at least one uplink metric.