OFDMA Multi-RU Aggregation Across Variable-Tone RUs
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Solution Overview
Problem
Existing wireless communication protocols, such as IEEE 802.11, are inefficient in utilizing resource units (RUs) due to restrictions that limit each station to a single RU, leading to wasted resources and reduced spectrum efficiency, especially in scenarios with small user numbers or unavailable secondary channels.
Innovation Solution
Implementing techniques that allow communication using multiple predefined RUs with varying tone numbers, including error coding, interleaving, and symbol mapping across these RUs, enabling efficient use of available bandwidth and reducing waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If each station is assigned to one resource unit (RU) in OFDMA, then device complexity is reduced and ease of operation is improved, but resource utilization efficiency deteriorates and spectrum efficiency is reduced
Solution Approach 1:
The patent merges multiple resource units (RUs) into a single aggregated RU that can be assigned to one station. This allows the station to utilize multiple frequency sub-channels simultaneously, improving resource utilization efficiency while maintaining simplified operation through single-RU assignment semantics. The aggregation combines adjacent RUs to form a larger contiguous frequency block.
Solution Approach 2:
The patent enables a single station to access multiple frequency sub-channels through aggregated RU allocation, making the resource allocation mechanism universal across different channel conditions. The system can dynamically aggregate RUs based on channel availability, interference conditions, and user demands, providing multi-functional adaptability.
2Reliability
If secondary channels are excluded due to DFS activity or interference, then reliability is improved by avoiding harmful factors, but spectrum efficiency deteriorates due to large bandwidth reduction
Solution Approach 1:
The patent segments the available spectrum into multiple RUs and allows selective aggregation of only those RUs that are free from DFS activity or interference. Instead of excluding entire secondary channels, the system identifies and aggregates available primary and secondary RUs, maintaining reliability by avoiding contaminated frequencies while improving spectrum efficiency through partial channel utilization.
Solution Approach 2:
The patent applies local quality by allowing different RUs within the same channel to have different availability statuses. The system performs localized resource aggregation based on specific RU conditions rather than blanket channel exclusion, enabling transmission on clean frequency portions while avoiding harmful interference zones.
3Adaptability or versatility
If center 26 tone RU is allocated in 20 MHz channel for two OFDMA users, then adaptability is improved for small user numbers, but resource utilization efficiency deteriorates due to wasted RUs
Solution Approach 1:
The patent merges adjacent RUs to form aggregated RUs that can be flexibly allocated to users. Instead of leaving the center 26-tone RU unused when only two users are present, the system aggregates available RUs including the center RU and allocates them to active users, eliminating waste while maintaining adaptability to varying user numbers through dynamic aggregation patterns.
Data Source
AI summary
An electronic device (such as an access point) is described. This electronic device transmits an orthogonal frequency division multiple access (OFDMA) frame to a recipient electronic device (such as a client or a station). The OFDMA frame includes multiple predefined resource units (RUs) allocated to the recipient electronic device in a set of predefined RUs having associated frequency bandwidths. Moreover, the multiple predefined RUs include two or more first predefined RUs having a first number of tones less than a predefined amount, or two or more second predefined RUs having a second number of tones greater than or equal to the predefined amount. For example, the predefined amount may include 242 tones. Note that the multiple predefined RUs may have the same or different numbers of tones. Moreover, the electronic may receive an acknowledgment or a block acknowledgment from the recipient electronic device.