Rotated Resource Units for Wireless Frame Diversity
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Solution Overview
Problem
The 802.11ax and 802.11be protocols' fixed Resource Unit (RU) allocation in downlink Orthogonal Frequency Division Multiple Access (OFDMA) leads to degraded receive sensitivity due to limited frequency diversity and increased packet error rates under narrowband interference.
Innovation Solution
Implementing rotated Resource Units in frequency, allowing for full, partial, or mixed spans of bandwidth usage, with optional hopping patterns and mixed sizes, to enhance frequency diversity and interference resilience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fixed Resource Unit (RU) allocation is used in downlink OFDMA, then overhead reduction and concurrent user scheduling are achieved, but receive sensitivity is degraded due to limited frequency diversity
Solution Approach 1:
The patent applies dynamics by transitioning from fixed RU allocation to rotating RU allocation across time periods. The resource unit that was previously static at a specific frequency location now dynamically changes its frequency position in subsequent time periods, allowing the system to adapt to varying channel conditions and exploit frequency diversity while maintaining efficient user scheduling
Solution Approach 2:
The patent changes the frequency location parameter of the resource unit over time. By rotating the RU to different frequency positions in different time periods, the system modifies the operational parameters to access diverse frequency channels, thereby improving receive sensitivity through frequency diversity without sacrificing scheduling efficiency
2Device complexity
If fixed Resource Unit (RU) allocation is used in downlink OFDMA, then simplified resource management is achieved, but packet error rate increases under narrowband interference due to weaker tolerance
Solution Approach 1:
The rotating RU allocation introduces dynamic behavior where the resource unit's frequency location changes over time periods. This dynamic approach allows the system to automatically avoid narrowband interference by shifting to different frequency positions, thereby reducing packet error rates while keeping resource management complexity manageable through structured rotation patterns
3Stability of the object's composition
If fixed Resource Unit (RU) allocation is used in downlink OFDMA, then consistent frequency positioning is maintained, but frequency diversity exposure is narrowed
Solution Approach 1:
The patent resolves this contradiction by implementing rotating RU allocation where the resource unit systematically changes its frequency position across different time periods. This dynamic rotation maintains stability through predictable rotation patterns while simultaneously expanding frequency diversity exposure by visiting multiple frequency locations, thus achieving both consistency and adaptability
Solution Approach 2:
The rotating RU allocation employs periodic action by repeating the rotation pattern across time periods. The resource unit follows a structured periodic trajectory through different frequency positions, ensuring consistent and predictable behavior while comprehensively exposing the system to frequency diversity over each rotation cycle
Data Source
AI summary
Embodiments of a wireless device and method are disclosed. In an embodiment, a wireless device comprises a wireless transceiver to receive and transmit frames, and a controller operably coupled to the wireless transceiver to process the frames, wherein the controller is configured to generate at least one frame that includes a resource unit for a first user that is rotated in frequency such that a first frequency location of the resource unit for a first time period is different than a second frequency location of the resource unit for a second time period.