SBFD PDSCH Rate Matching Across DL Subband Boundaries
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Solution Overview
Problem
Existing methods for UE rate matching in subband full duplex (SBFD) operations fail to accurately account for PDSCH rate matching across DL subband boundaries, leading to potential overcounting and exceeding UE's rate matching capabilities.
Innovation Solution
A UE indicates to a gNB how rate matching for PDSCH crossing DL subband boundaries should be counted towards its rate matching limits, distinguishing between BWP and serving-cell limits, and adjusts the number of RateMatchPatterns accordingly based on subband configuration and capability signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If rate matching is applied for PDSCH crossing DL subband boundaries in SBFD operations, then resource allocation accuracy is improved, but UE rate matching capability limits are exceeded due to overcounting
Solution Approach 1:
The patent segments the rate matching pattern counting into two separate categories: BWP-level patterns and serving-cell-level patterns. This segmentation allows the UE to indicate separately which type of rate matching should be counted toward its capability limits, preventing overcounting by distinguishing between patterns that apply at different hierarchical levels of the radio resource structure.
Solution Approach 2:
The patent introduces a new parameter (rate matching pattern counting type) that allows the UE to dynamically indicate how rate matching patterns should be counted. This parameter change enables the UE to adapt the counting methodology based on the specific SBFD configuration and capability, transforming a fixed counting approach into a flexible, capability-aware mechanism.
2Productivity
If rate matching patterns are configured for PDSCH in SBFD operations, then spectrum utilization is improved, but device complexity increases due to multiple pattern groups
Solution Approach 1:
The patent creates a universal rate matching pattern framework that serves multiple functions: it handles both legacy TDD rate matching and new SBFD rate matching scenarios. By designing RateMatchPattern information elements that can represent different types of reserved resources (UL subbands, DL subbands, flexible subbands), the system achieves multi-functionality without requiring separate configuration mechanisms for each scenario.
Solution Approach 2:
The patent introduces dynamic selection mechanisms where the UE can indicate which group of rate matching patterns should be applied based on current SBFD operation status. The gNB can dynamically configure different RateMatchPattern groups and the UE dynamically selects the appropriate group, allowing the system to adapt between different operational modes (TDD, SBFD, FDD) without static hardcoding.
Data Source
AI summary
A system and a method are disclosed for UE rate matching in SBFD operations. A method includes determining whether rate matching of a physical downlink (DL) shared channel (PDSCH) that crosses a boundary of a DL subband in a subband full duplex (SBFD) operation is to be counted towards a maximum limit on a number of rate matching patterns; and performing the rate matching of the PDSCH that crosses the boundary of the DL subband in the SBFD operation, based on the determination.