Interleaved CCE-to-REG Mapping for RedCap UE Buffering
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Solution Overview
Problem
Current mobile communication systems, particularly in 5G NR, face challenges in efficiently mapping control channel elements (CCEs) to resource element groups (REGs) within a control resource set (CORESET), leading to increased complexity and buffering requirements for RedCap UE, which affects decoding speed and performance, especially in reduced capability user equipment (UE) with lower peak data rates.
Innovation Solution
Implementing interleaved CCE-to-REG mapping within interleaver blocks, where resource element groups of a first interleaver block are mapped to control channel elements before subsequent blocks, reducing complexity and improving decoding efficiency by spreading CCEs across narrowband segments, thus enabling efficient data transmission and reception in reduced bandwidth scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If interleaved CCE-to-REG mapping is implemented across the entire CORESET, then frequency diversity is improved, but device complexity and buffering requirements increase for RedCap UE
Solution Approach 1:
The patent divides the CORESET into multiple interleaver blocks, where each block contains a subset of REGs. The interleaved mapping is applied within each block independently rather than across the entire CORESET. This segmentation reduces the buffering requirements and complexity for RedCap UE while maintaining frequency diversity benefits within each block.
Solution Approach 2:
The patent applies different mapping approaches to different parts of the CORESET. Specifically, interleaved mapping is applied within each interleaver block to provide frequency diversity locally, while the overall structure is divided into manageable blocks that reduce global complexity and buffering requirements for RedCap UE.
2Productivity
If interleaved CCE-to-REG mapping is implemented, then decoding performance is improved, but complexity for reduced capability UE increases
Solution Approach 1:
The patent segments the CORESET into multiple interleaver blocks and applies interleaved mapping within each block. This segmentation allows RedCap UE to process smaller, manageable units independently, improving decoding speed through parallel processing while reducing overall processing complexity compared to handling the entire CORESET as one unit.
Solution Approach 2:
The patent applies interleaved mapping partially - only within each interleaver block rather than across the entire CORESET. This partial application provides sufficient frequency diversity and decoding performance improvement for RedCap UE without incurring the full complexity cost of complete interleaved mapping across all REGs.
Data Source
AI summary
Methods and apparatuses for interleaved control channel element to resource element group mapping within a portion of a control resource set. A method may include determining a first set of parameters having a first configuration for a first control resource set including a plurality of resource element groups. The method also includes determining an interleaver block size of each of a plurality of interleaver blocks. The plurality of interleaver blocks are formed by dividing the control resource set in time and numbering the interleaver blocks. The method further includes mapping the plurality of resource element groups to control channel elements, such that resource element groups of a first interleaver block, which are a subset of the plurality of resource element groups, are mapped to the control channel elements before mapping resource element groups of any subsequent interleaver block of the plurality of interleaver blocks to control channel elements.