Dynamic Rate Matching for LTE Interference in 5G DSS
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Solution Overview
Problem
Dynamic spectrum sharing (DSS) in 5G NR cells faces challenges in accurately estimating and mitigating interference from LTE reference signals, which limits spectral efficiency due to inadequate interference measurement resources and rate matching configurations.
Innovation Solution
The introduction of new channel state information (CSI) interference measurement resources (IMRs) and configurations that match LTE reference signal patterns, along with additional information for interference cancellation, allows UEs to measure and report interference levels effectively, enabling the gNB to configure optimal rate matching patterns and improve DSS operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If rate matching is used to avoid LTE reference signals, then interference is mitigated, but spectral efficiency deteriorates due to resource element waste
Solution Approach 1:
The patent implements dynamic rate matching patterns that can be adapted based on actual interference measurements. The gNB configures multiple rate matching patterns and selects the optimal one based on UE feedback about interference conditions, allowing the system to dynamically adjust between avoiding interference completely or utilizing resources when interference is manageable, thus resolving the contradiction between interference mitigation and spectral efficiency
Solution Approach 2:
The patent changes the parameter of rate matching configuration from static to dynamic by introducing multiple configurable patterns with different parameters (such as different resource element allocation patterns). The system can switch between these patterns based on channel conditions and interference levels, optimizing spectral efficiency while maintaining interference mitigation where necessary
2Measurement precision
If interference measurement resources are increased, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent makes the CSI-IM resources universal by designing them to serve multiple functions: they can measure interference from LTE reference signals, support multiple rate matching patterns, and provide feedback for both CQI and interference level reporting. This multi-functionality allows accurate interference measurement without proportionally increasing complexity, as the same measurement infrastructure supports multiple operational modes
Solution Approach 2:
The patent segments the interference measurement process into configurable resource sets, where different CSI-IM resource configurations can be assigned to different UEs or different time-frequency resources. This segmentation allows the system to achieve high measurement precision for specific scenarios without requiring all UEs to handle the full complexity of multiple measurement configurations simultaneously
Data Source
AI summary
The present application relates to devices and components including apparatus, systems, and methods for configuring or utilizing rate matching patterns and interference measurements.