PUCCH Resource Mapping Across CCE Subsets to Prevent Collisions
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Solution Overview
Problem
Existing methods for implicitly determining Physical Uplink Control Channel (PUCCH) resources in New Radio (NR) networks face issues with flexible selection and collisions due to restrictive PDCCH configurations, leading to implementation complexities and coverage limitations.
Innovation Solution
Implement methods for collision-free implicit mapping of PUCCH resources using candidate index determination across aggregation levels and CCE-based sub-banding, with pseudo-random variables to ensure flexible selection and reduce blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If CCE-based implicit mapping is used for PUCCH resource determination, then resource selection is simplified, but resource collisions and blocking occur due to limited PUCCH resource pools
Solution Approach 1:
The PUCCH resource pool is segmented into multiple subsets based on CCE index ranges. Each subset serves a specific range of CCEs, preventing collisions by distributing UEs across different subsets. The network configures multiple PUCCH resource subsets, and each UE determines which subset to use based on its scheduled CCE index, thereby eliminating resource conflicts while maintaining simple implicit mapping.
Solution Approach 2:
The patent introduces an additional dimension to resource selection by using both CCE index and aggregation level to determine PUCCH resources. Instead of mapping CCEs to a single linear resource pool, the method creates a two-dimensional mapping space where resources are allocated based on combinations of CCE ranges and aggregation levels, significantly expanding the effective resource pool and reducing blocking.
2Reliability
If PUCCH resource subsets are configured for different CCE ranges, then resource collisions are reduced, but configuration complexity increases
Solution Approach 1:
The system implements self-service implicit mapping where UEs autonomously determine their PUCCH resource subset based on pre-configured CCE range boundaries and their own scheduled CCE index. The network only needs to configure the boundary parameters once, and each UE automatically selects the appropriate subset without additional signaling or complex configuration, reducing both network and device complexity while preventing collisions.
3Reliability
If aggregation level-based indexing is used for PDCCH candidates, then unique PUCCH resource mapping is achieved, but selection flexibility is reduced
Solution Approach 1:
The patent implements dynamic PUCCH resource selection within each aggregation level subset. Instead of fixed mapping, UEs can select from multiple candidate resources within their assigned subset based on current channel conditions and traffic requirements. The aggregation level determines the subset, but the actual resource selection within the subset is flexible and can adapt to changing conditions, maintaining uniqueness while providing versatility.
Data Source
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AI summary
A method and apparatus for implicitly determining a PUCCH resource. The invention allows for flexible selection of a PUCCH resource in the PUCCH resource subset for configurations of PDCCH resources without collisions through the use of a unique indices in a search-space-set in a control-resource set and/or the use of indices for control channel element subsets.