Per-Subband CSI Reporting Across Multiple TRPs for UE Scheduling
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in scheduling user equipment (UE) due to the lack of per-subband preferences for channel state information (CSI) measurements across multiple transmission reception points (TRPs), leading to suboptimal resource allocation and degraded communication quality.
Innovation Solution
Implementing per-subband preferences for channel state information reference signals (CSI-RS) measurements by specifying TRPs based on a CSI-RS resource indicator (CRI) format, allowing UEs to report CRI measurements for each subband, and enabling base stations to schedule resources more efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If per-subband preferences for CSI measurements are implemented across multiple TRPs, then scheduling efficiency and communication quality are improved, but device complexity and signaling overhead increase
Solution Approach 1:
The patent divides the bandwidth into multiple subbands and introduces per-subband preferences for CSI measurements. Instead of treating the entire bandwidth uniformly, the system segments it into subbands (e.g., first subband, second subband) and allows the UE to indicate different preferred TRPs for different subbands. This segmentation enables more granular and efficient resource scheduling while managing complexity through structured reporting formats.
Solution Approach 2:
The patent adds a frequency dimension to the CSI reporting by introducing subband-level preferences. The CRI report format includes subband indication fields that allow the UE to provide preferences not just across spatial dimensions (different TRPs) but also across frequency dimensions (different subbands). This multi-dimensional approach improves scheduling efficiency by capturing frequency-selective channel characteristics.
2Measurement precision
If per-subband CRI reports are transmitted for multiple TRPs, then resource allocation accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent implements partial reporting by allowing the UE to indicate preferences for only certain subbands rather than all subbands. The CRI report format includes subband indication fields that can selectively report on specific subbands where frequency-selective scheduling is beneficial. This partial action approach maintains measurement precision for critical subbands while reducing signaling overhead by omitting redundant reports for other subbands.
3Adaptability or versatility
If multiple CRI report formats are supported for different quantities of preferences per subband, then system adaptability is improved, but device complexity increases
Solution Approach 1:
The patent introduces dynamic adaptability through multiple CRI report formats that can be configured based on system conditions. The UE can be configured to use different report formats (e.g., first CRI report format, second CRI report format) depending on the number of preferred TRPs per subband. This dynamic approach allows the system to adapt to varying channel conditions and traffic requirements while the UE implementation complexity is managed through standardized format definitions.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine one or more per-subband preferences, that specify transmission reception points (TRPs) from which the UE is to measure channel state information reference signals (CSI-RSs), based at least in part on a CSI-RS resource indicator (CRI) format indicator that indicates a quantity of preferences per subband. The UE may transmit, to a base station, a CRI report based at least in part on the one or more per-subband preferences. Numerous other aspects are provided.