PDCCH Monitoring Search Space Subsets for RedCap UEs
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Solution Overview
Problem
In 5G NR wireless communication, the PDCCH monitoring for RedCap UEs requires repetition to enhance detection performance, but this can degrade the performance of legacy eMBB or URLLC UEs, and existing solutions fail to balance the PDCCH repetition requirements of both types of UEs effectively.
Innovation Solution
The method involves configuring search space subsets with specific aggregation levels and repetition levels for PDCCH monitoring occasions, where RedCap UEs have dedicated and shared monitoring occasions with legacy UEs, optimizing the candidate sets and repetition levels to improve detection performance while minimizing impact on legacy UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PDCCH repetition is performed for RedCap UEs in shared PDCCH monitoring occasions, then PDCCH detection performance for RedCap UEs is improved, but PDCCH blocking rate and scheduling flexibility for legacy UEs are degraded
Solution Approach 1:
The patent divides the PDCCH monitoring occasions into different types (first type for legacy UEs, second type for RedCap UEs) and configures different search space subsets for each type. This segmentation allows RedCap UEs to have dedicated monitoring occasions for repetition without interfering with legacy UE scheduling, thereby improving RedCap detection performance while maintaining legacy UE reliability.
Solution Approach 2:
The patent applies different configurations to different monitoring occasion types: first search space subsets for legacy UEs with standard aggregation levels, and additional search space subsets for RedCap UEs with repetition levels. This local quality differentiation ensures that PDCCH repetition benefits RedCap UEs specifically without degrading legacy UE performance.
2Measurement precision
If PDCCH repetition is performed for RedCap UEs, then PDCCH detection performance for RedCap UEs is improved, but the complexity of PDCCH monitoring configuration increases
Solution Approach 1:
The patent segments search space configurations into multiple subsets (first search space subset for legacy UEs, additional search space subset for RedCap UEs), each with specific aggregation levels and repetition levels. This structured segmentation organizes the complexity into manageable, independently configurable units.
Solution Approach 2:
The patent introduces dynamic parameters including repetition levels and associations between different search space subsets, allowing the system to adaptively configure PDCCH monitoring based on UE capability. The repetition level and candidate associations provide flexible, dynamic control over the monitoring configuration complexity.
Data Source
AI summary
The present application relates to a method and an apparatus for Physical Downlink Control Channel (PDCCH) monitoring. One embodiment of the subject application provides a method performed by a first type of user equipment (UE), which includes: receiving search space set configuration including one or more search space subsets, wherein each search space subset includes at least one aggregation level and a total number of candidates associated with each aggregation level, and wherein each search space subset is independently configured for a Physical Downlink Control Channel (PDCCH) monitoring occasion group including at least one PDCCH monitoring occasion; and determining a candidate set for each search space subset for PDCCH monitoring.