Wi-Fi Distributed RU Allocation for Punctured Channel Throughput
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Solution Overview
Problem
Existing wireless local area network (WLAN) systems face inefficiencies in managing peer-to-peer traffic within a BSS, particularly in handling channel access and resource allocation for high-throughput stations, leading to suboptimal utilization of available bandwidth.
Innovation Solution
Implementing a method where a station (STA) receives a trigger frame with a resource unit (RU) allocation field indicating a distributed RU (DRU) index value, determining a DRU allocation based on this index, and transmitting tones using a DRU within a distribution bandwidth, with tones interleaved across multiple tone distribution plans.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional channel access mechanisms (CSMA/CA) are used in WLAN systems, then channel access is simple to implement, but bandwidth utilization is suboptimal and throughput is limited for peer-to-peer traffic
Solution Approach 1:
The channel bandwidth is segmented into multiple distributed resource units (DRUs) that can be independently allocated to different stations. Each DRU contains interleaved tones from multiple tone distribution plans, allowing fine-grained resource allocation. This segmentation enables more efficient bandwidth utilization by assigning specific DRUs to stations based on traffic needs, rather than using traditional contention-based access where the entire channel is contested.
Solution Approach 2:
The system implements dynamic resource allocation where the access point can assign different DRUs to different stations on different occasions based on current network conditions and traffic requirements. The RU allocation field in trigger frames enables dynamic reconfiguration of resource units, allowing the system to adapt to changing traffic patterns and optimize bandwidth utilization in real-time.
2Productivity
If distributed resource units with interleaved tones are implemented, then bandwidth utilization and throughput are improved, but resource allocation complexity increases
Solution Approach 1:
The system pre-defines multiple tone distribution plans that specify how tones are distributed across different resource units. These plans are established in advance and stored in the system, allowing stations to quickly determine their allocated tones based on received allocation information without performing complex real-time calculations. The RU allocation field in trigger frames references these pre-defined plans, simplifying the allocation process.
Solution Approach 2:
The access point acts as an intermediary that manages the complex tone distribution and DRU allocation processes. It receives allocation requests, determines appropriate DRU assignments based on network conditions, and communicates allocations to stations through trigger frames. This centralizes the complexity management at the AP, which has the computational resources to handle the intricate tone distribution calculations.
3Adaptability or versatility
If multiple tone distribution plans are interleaved across distribution bandwidth, then resource allocation flexibility is improved, but difficulty of detecting and measuring allocations increases
Solution Approach 1:
The access point pre-calculates and stores multiple tone distribution plans that define specific tone patterns for different resource unit configurations. When allocating resources, the AP selects an appropriate pre-defined plan and references it in the RU allocation field of trigger frames. This allows stations to detect their allocations by looking up the referenced plan rather than parsing complex allocation details, significantly reducing detection difficulty.
Solution Approach 2:
The system uses reference copying where the RU allocation field in trigger frames contains references (indices) to pre-defined tone distribution plans rather than containing the full allocation details. Stations copy the referenced plan information from their stored definitions, reducing the amount of information that needs to be transmitted and detected while maintaining full allocation flexibility.
Data Source
AI summary
In an example, a station (STA) receives, from an access point (AP), a trigger frame with a resource unit (RU) allocation field indicating a distributed RU (DRU) index value. Further, the STA determines, based on the indicated DRU index value, a DRU allocation from a plurality of DRU allocations. Each of the plurality of DRU allocations includes a respective tone distribution plan. Further, tones of the determine DRU allocation and the respective tone distribution plan are interleaved with tones of one or more other tone distribution plans, of the plurality of tone distribution plans, across a distribution bandwidth. The STA then transmits, to the AP, a plurality of tones using a DRU within the distribution bandwidth, based on the determine DRU allocation and the respective tone distribution plan. In a further example, the trigger frame may include information indicating the distribution bandwidth.