Wireless Resource Unit Allocation for Interference Prevention in Dense WLAN
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Solution Overview
Problem
Current wireless LAN systems face limitations in spectrum efficiency and throughput, especially in dense environments with multiple access points and stations, and struggle to manage diverse data traffic and resource allocation effectively, leading to restricted bandwidth usage and interference.
Innovation Solution
The implementation of an OFDMA-based resource allocation method, where access points allocate different-sized wireless resource units to stations within a basic service set, allowing for flexible scheduling and increased throughput by using orthogonal frequency division multiple access (OFDMA) technology, defining resource units such as regular and irregular units, and allocating guard tones and DC tones for interference alleviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional wireless resource allocation methods are used in dense environments, then system simplicity is maintained, but spectrum efficiency and throughput are limited
Solution Approach 1:
The available bandwidth is segmented into multiple subchannels, and each subchannel is further divided into resource units (RUs) of different sizes. This segmentation allows multiple STAs to be allocated specific frequency resources simultaneously, increasing throughput while managing complexity through structured division of the spectrum.
Solution Approach 2:
The system dynamically allocates resource units of varying sizes to different STAs based on their specific bandwidth requirements and traffic conditions. This dynamic allocation adapts to changing network conditions, optimizing throughput while the centralized AP coordination manages allocation complexity.
2Adaptability or versatility
If fixed bandwidth allocation is used, then allocation simplicity is maintained, but adaptability to diverse STA bandwidth requirements is reduced
Solution Approach 1:
Different STAs are assigned resource units with locally optimized bandwidth sizes according to their specific requirements. Each STA receives a customized allocation from the available RUs, allowing small bandwidth STAs to use smaller RUs and large bandwidth STAs to use larger RUs, thereby achieving local adaptability without requiring complete reconfiguration of the system.
3Productivity
If multiple STAs share the entire bandwidth simultaneously, then spectrum efficiency is improved, but interference between STAs increases
Solution Approach 1:
The total bandwidth is segmented into multiple non-overlapping subchannels and resource units. By allocating specific RUs to different STAs in an orthogonal manner (different frequency resources), the system allows simultaneous transmission to multiple STAs while eliminating inter-STA interference through frequency division.
Solution Approach 2:
The access point acts as an intermediary that coordinates resource allocation among multiple STAs. The AP assigns specific RUs to each STA, managing the frequency resource distribution to ensure orthogonal allocation and prevent interference while maximizing spectrum utilization.
4Ease of operation
If uniform resource unit sizes are allocated to all STAs, then allocation simplicity is maintained, but scheduling flexibility is reduced
Solution Approach 1:
The system changes the parameter of resource unit size to match different STA requirements. Multiple RU sizes are defined within the bandwidth, and the AP selects appropriate RU sizes for each STA based on their bandwidth capabilities and traffic needs, achieving flexible scheduling while maintaining systematic allocation through predefined RU structures.
Data Source
AI summary
Disclosed is a method and apparatus for allocating a wireless resource in order to prevent interference in a wireless LAN. A method for allocating a wireless resource in a wireless LAN may comprise the steps of: allocating, by an AP, a plurality of wireless resources for a plurality of STAs included in a BSS, in the entire bandwidth, respectively; and transmitting, by the AP, a PPDU to the plurality of STAs through the plurality of wireless resources, respectively, wherein each of the plurality of wireless resources is a combination of a plurality of wireless units defined in different sizes on a frequency axis, and each of the plurality of wireless resources can be determined in consideration of the size of the bandwidth of at least one STA supporting a bandwidth smaller than the size of the entire bandwidth from among the plurality of STAs.