Wireless LAN Resource Unit Allocation via Segmentation
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Solution Overview
Problem
Next-generation wireless local area networks (WLANs) face challenges in improving spectrum efficiency and area throughput, especially in dense environments with multiple access points and stations, and outdoor settings, where existing technologies limit bandwidth allocation and throughput due to interference and user load.
Innovation Solution
A method for allocating resource units in a wireless LAN, where an access point generates and transmits PHY layer protocol data units (PPDUs) across the entire frequency bandwidth, including resource allocation information for both larger and smaller resource units, allowing for flexible scheduling and increased throughput by using orthogonal frequency division multiple access (OFDMA) technology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If resource units are allocated uniformly across frequency bandwidth, then simplicity of allocation is maintained, but scheduling flexibility and throughput are limited
Solution Approach 1:
The frequency bandwidth is segmented into multiple resource units of different sizes (e.g., 26-tone, 52-tone, 106-tone RUs). This segmentation allows the system to allocate appropriate-sized resource units to different stations based on their specific requirements, thereby improving scheduling flexibility without requiring complete redesign of the allocation mechanism.
Solution Approach 2:
Different resource units with different tone allocations are assigned to different stations based on local requirements. Stations with higher data rates or more demanding applications receive larger resource units, while stations with lower requirements receive smaller units. This local differentiation optimizes overall system throughput while maintaining manageable allocation complexity through standardized unit types.
2Productivity
If larger resource units are allocated to all stations, then throughput increases, but interference management and user load handling deteriorate
Solution Approach 1:
By dividing the frequency spectrum into multiple resource units of varying sizes, the system can allocate larger units to stations requiring high throughput while assigning smaller units to other stations. This segmentation enables fine-grained control over resource distribution, allowing the system to maximize overall throughput while maintaining adequate interference management through selective allocation.
Solution Approach 2:
The system changes the parameter of resource unit size dynamically based on station requirements, channel conditions, and interference levels. By adjusting the tone allocation parameter (26, 52, or 106 tones) according to specific needs, the system optimizes throughput for each station while managing overall interference and user load effectively.
3Productivity
If different-sized resource units are allocated to multiple stations, then throughput and scheduling flexibility increase, but resource allocation complexity increases
Solution Approach 1:
The frequency bandwidth is divided into standardized resource units with predefined size categories (26-tone, 52-tone, 106-tone RUs). This segmentation approach enables flexible throughput optimization by allocating different standardized unit types to different stations, while the standardization itself keeps allocation complexity manageable through a limited set of allocation options rather than continuous variable allocation.
Data Source
AI summary
A method and a device for allocating resource units in a wireless LAN are disclosed. The method for allocating resource units in a wireless LAN comprises the steps of: generating, by an AP, a PPDU to be transmitted to a plurality of STAs; and transmitting, by the AP, the PPDU to the plurality of STAs on the whole frequency band, wherein the PPDU includes resource allocation information, the resource allocation information includes first resource unit allocation information for allocating first resource units and second resource unit allocation information for allocating second resource units, the first resource unit allocation information is information relating to the allocation of the first resource units for at least one first STA, among the plurality of STAs, which is to receive the PPDU through the first resource units on the whole frequency band, the second resource unit allocation information is information relating to the allocation of the second resource units for at least one second STA, among the plurality of STAs, which is to receive the PPDU through the second resource units on the whole frequency band, and the number of tones allocated to the first resource units can be larger than the number of tones allocated to the second resource units.