RU Interleaving for Frequency Diversity in Wireless Systems
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Solution Overview
Problem
Communication systems, particularly those using Resource Units (RUs) and Multiple Resource Units (MRUs), face limitations in achieving large bandwidth benefits when RUs or MRUs are directly allocated to a Single STA, as they do not effectively utilize frequency diversity gains.
Innovation Solution
An interleaving method and device that interleave and deinterleave resource units (RUs) based on bandwidth, interleaving granularity, punctured channel information, and interleaver type, using triangular, spiral, or ladder interleavers to optimize RU allocation and deinterleaving, allowing for efficient use of bandwidth and frequency diversity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If RUs or MRUs are directly allocated to one STA, then allocation simplicity is improved, but frequency diversity gain and bandwidth utilization deteriorate
Solution Approach 1:
The patent segments the frequency spectrum into multiple RUs and further divides each RU into multiple sub-RUs. This segmentation allows the STA to receive data from multiple distributed frequency locations, achieving frequency diversity without complicating the allocation process. The AP performs interleaving at the sub-RU level while maintaining RU-level allocation simplicity.
Solution Approach 2:
The patent introduces a new dimension of interleaving at the sub-RU level within each RU. Instead of only allocating at the RU level, the system now operates at two levels: RU allocation (simple) and sub-RU interleaving (diversity). This dimensional expansion resolves the contradiction by adding complexity only where needed for frequency diversity.
2Device complexity
If RUs or MRUs are directly allocated to one STA, then allocation complexity is reduced, but bandwidth benefit utilization deteriorates
Solution Approach 1:
The patent segments each RU into multiple sub-RUs and applies interleaving within each RU. This allows the system to utilize the full allocated bandwidth effectively by distributing data across multiple frequency sub-segments, thereby improving bandwidth utilization without significantly increasing allocation complexity at the RU level.
Solution Approach 2:
The patent introduces dynamic interleaving patterns (triangular, spiral, ladder) that can be selected based on channel conditions and requirements. This dynamic approach allows the system to adaptively optimize bandwidth utilization while keeping the base allocation mechanism simple, resolving the contradiction between complexity and productivity.
3Reliability
If interleaving is applied to RUs, then frequency diversity gain is improved, but processing complexity increases
Solution Approach 1:
The patent segments the interleaving operation into manageable sub-RU units within each RU. By processing smaller sub-RU blocks rather than entire RUs, the processing complexity is reduced while still achieving frequency diversity through the interleaving of sub-RUs. The segmented approach makes the interleaving operation more computationally feasible.
Solution Approach 2:
The patent applies interleaving selectively to sub-RUs rather than to all RUs uniformly. This partial action approach achieves frequency diversity gain in the most critical frequency regions without the full processing overhead of interleaving every RU, thereby reducing overall processing complexity while maintaining reliability benefits.
Data Source
AI summary
A deinterleaving method includes: deinterleaving, by a second device, an RU according to first information, where the first information includes at least one of an interleaving granularity, punctured channel information or an interleaver type.