Non-primary Channel Access for Wireless Bandwidth Utilization
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Solution Overview
Problem
Existing wireless networking standards, such as IEEE 802.11, suffer from bandwidth underutilization due to the restriction that a station cannot transmit in any portion of the operating bandwidth if the primary 20 MHz channel is busy, even if non-primary channels are idle.
Innovation Solution
The solution allows a station to establish a secondary TXOP in a non-primary channel during a primary TXOP in the primary channel, enabling data transmission in the non-primary channel while the primary channel is busy, thus optimizing bandwidth utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a station follows existing IEEE 802.11 standards and cannot transmit in non-primary channels when the primary channel is busy, then channel access control is simplified and interference is reduced, but bandwidth utilization deteriorates significantly
Solution Approach 1:
The patent segments the operating bandwidth into primary and non-primary channels, allowing independent access control. Stations can establish separate TXOPs (transmission opportunities) in non-primary channels even when the primary channel is busy, enabling parallel data transmission across different bandwidth segments and thereby improving overall bandwidth utilization without compromising primary channel control.
Solution Approach 2:
The patent introduces a new dimension to channel access by allowing simultaneous operations in primary and non-primary channels. Instead of sequential access controlled by the primary channel status, the system enables stations to establish TXOPs in non-primary channels independently, creating a multi-dimensional access paradigm that increases throughput and bandwidth efficiency.
2Power
If the operating bandwidth is increased to support high-speed applications, then data transmission capacity is improved, but bandwidth underutilization worsens due to the primary channel restriction
Solution Approach 1:
The patent divides the wide operating bandwidth into primary and non-primary segments, allowing stations to utilize non-primary segments independently when primary segments are occupied. This segmentation enables high-speed data transmission across multiple bandwidth segments simultaneously, maintaining high data transmission capacity while eliminating wasted bandwidth in non-primary segments.
Solution Approach 2:
The patent changes the channel access parameters by introducing separate TXOP establishment mechanisms for non-primary channels. Stations can now establish TXOPs in non-primary channels based on local channel conditions rather than being constrained by primary channel status, optimizing bandwidth utilization across the entire operating bandwidth while maintaining high data transmission capacity.
3Productivity
If non-primary channel access is allowed during primary TXOP, then bandwidth utilization is improved, but channel access complexity increases
Solution Approach 1:
The patent manages complexity by segmenting channel access control into independent primary and non-primary channel management. Each channel segment has its own TXOP establishment and termination mechanisms, simplifying the control logic for each segment while enabling parallel operation across segments. This segmentation approach improves bandwidth utilization without proportionally increasing overall system complexity.
Solution Approach 2:
The patent introduces TXOP (transmission opportunity) as an intermediary mechanism that mediates between primary and non-primary channel access. TXOP provides a standardized framework for managing simultaneous transmissions, simplifying the coordination complexity while enabling improved bandwidth utilization through structured parallel access control.
Data Source
AI summary
Disclosed herein is a method performed by a station (STA) in a wireless network to access a non-primary channel. The method includes determining a maximum supportable bandwidth of a primary transmission opportunity (TXOP) established in a primary channel, responsive to a determination that the maximum supportable bandwidth of the primary TXOP is smaller than a maximum supportable bandwidth of the STA, establishing a secondary TXOP in the non-primary channel, and transmitting a data frame to a second STA during the secondary TXOP in the non-primary channel.