UE CSI Reporting for Group-Based Multi-Beam Reception
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Solution Overview
Problem
In Rel-15 NR and Rel-16 NR, UEs configured for group-based beam reporting can only report two different beam indices, leading to potential reduction in communication throughput due to simultaneous transmission of beams incapable of being received by the UE, as the method for appropriately judging which beams can be simultaneously received has not been clarified.
Innovation Solution
A terminal is equipped with a receiving section to receive specific configurations for CSI reporting, allowing CSI reports to include CSI based on multiple configurations, enabling the UE to report a plurality of beam indices per group, with explicit or implicit group indices, and supporting simultaneous reception of multiple beams by the UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If group-based beam reporting is configured to enable reporting of multiple beam indices, then the capability to report beam information is improved, but the complexity of determining which beams can be simultaneously received increases
Solution Approach 1:
The patent segments the beam reporting process by introducing separate reporting modes: group-based beam reporting (reporting multiple beam indices within a group) and non-group-based beam reporting (reporting beam indices without group association). This segmentation allows the UE to handle complex beam selection by dividing the reporting function into manageable modes, each with specific rules for beam index selection and reporting.
Solution Approach 2:
The patent introduces a configuration parameter (groupBasedBeamReporting flag) as an intermediary that controls the reporting mode. This intermediary mechanism allows the base station to signal the UE about the intended beam reporting method, enabling the UE to appropriately select and report beam indices based on the configured mode without needing to independently determine complex beam compatibility rules.
2Quantity of substance
If the number of reportable beam groups is increased beyond 2, then the beam reporting capacity is improved, but the reliability of simultaneous beam reception decreases
Solution Approach 1:
The patent changes the reporting parameter structure by allowing flexible configuration of the number of beam groups (nrofReportedGroups) beyond the traditional limit of 2. This parameter change enables the UE to report more beam indices while the base station adjusts transmission parameters (such as time division multiplexing or spatial separation) to ensure reliable simultaneous reception, thus decoupling the quantity of reportable beams from reception reliability.
3Loss of information
If CSI report includes CSI from multiple specific configurations, then the information completeness is improved, but the processing complexity increases
Solution Approach 1:
The patent merges multiple CSI measurements from different specific configurations (first specific configuration and second specific configuration) into a single unified CSI report. This combining approach allows the UE to report comprehensive beam information including SINR values from multiple configurations without requiring separate processing and transmission of each CSI component, thus reducing overall processing complexity while maintaining information completeness.
Data Source
AI summary
A terminal according to one aspect of the present disclosure includes a receiving section that receives a plurality of specific configurations in relation to a channel state information (CSI) report configuration, and a control section that configures a CSI report including CSI for each group such that the CSI report includes CSI based on a first specific configuration and CSI based on a second specific configuration, the first specific configuration and the second specific configuration being out of the plurality of specific configurations. According to one aspect of the present disclosure, it is possible to preferably use a CSI report related to group-based beam reporting.