WLAN BSS Load Management via Channel Quiet Intervals
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Solution Overview
Problem
Current WLAN systems are unable to provide stations with load information on channels with bandwidths greater than 20 MHz, such as 40 MHz, 60 MHz, or 80 MHz, limiting their ability to select less busy channels for association and potentially leading to co-channel interference with other wireless systems.
Innovation Solution
A BSS load management procedure that provides stations with load information on all available channels using a bonding channel, including a quiet interval setup mechanism to avoid co-channel operations, by including quiet elements in beacon or probe response frames that specify quiet intervals for all channels used in the bonding channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If WLAN systems use bonding channels with bandwidth greater than 20 MHz (40 MHz, 60 MHz, or 80 MHz), then data transfer rate and network capacity are improved, but the ability to provide load information to stations is worsened because current systems cannot provide load information on channels with bandwidths greater than 20 MHz
Solution Approach 1:
The patent segments the wide bonding channel (40/60/80 MHz) into multiple 20 MHz sub-channels for individual load measurement and reporting. Each 20 MHz sub-channel within the bonding channel is measured separately, and load information for each sub-channel is provided to stations, enabling comprehensive load information delivery across the entire wide channel bandwidth
Solution Approach 2:
The patent introduces a new dimensional approach by extending load information provision from single 20 MHz channels to multiple 20 MHz sub-channels within a bonding channel. This multi-dimensional load information structure allows stations to understand channel utilization across different frequency sub-bands, enabling more informed channel selection decisions
2Ease of operation
If stations associate with busy channels without load information, then network access is achieved, but co-channel interference with other wireless systems increases
Solution Approach 1:
The patent implements feedback mechanisms where access points continuously measure and report channel load information to stations. This feedback enables stations to make informed decisions about channel selection and association, avoiding busy channels that would lead to co-channel interference and improving overall network performance
Solution Approach 2:
The patent provides load information to stations before they make association decisions. By having stations receive and process load information in advance, stations can proactively select less busy channels for association, preventing co-channel interference before it occurs rather than reacting to interference after association
Data Source
AI summary
A method for selecting a channel in a wireless local area network, and a device therefore. The method according to one embodiment includes receiving an extended quiet interval element from an access point. The extended quiet interval element indicates that at least one of a primary channel and a secondary channel is to be quieted during a quiet interval for a radar detection. The method according to the embodiment includes quieting the indicated channel during the quiet interval.