Coordinated Secondary Channel Access for OBSS Bandwidth Reuse
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Solution Overview
Problem
In wireless local area networks, overlapping basic service sets often occupy only a portion of the operating range, leaving the remainder unused, leading to inefficient use of network resources.
Innovation Solution
An access point coordinates opportunistic secondary channel access by determining the duration and bandwidth of overlapping basic service set activity and initiating a transmit opportunity on a secondary channel, allowing wireless devices to utilize the unused bandwidth efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless devices wait for primary channel to be completely clear before transmitting, then transmission reliability is improved, but spectrum utilization efficiency deteriorates
Solution Approach 1:
The channel bandwidth is segmented into primary channel and secondary channel portions. The primary channel is used for initial OBSS activity detection and coordination, while the secondary channel is used for opportunistic transmissions when the primary channel is occupied by OBSS. This segmentation allows devices to transmit simultaneously on different channel portions without interfering with OBSS activity on the primary channel, thereby improving spectrum utilization while maintaining transmission reliability.
2Productivity
If devices transmit on secondary channel during OBSS activity on primary channel, then spectrum utilization efficiency is improved, but transmission reliability may deteriorate due to potential interference
Solution Approach 1:
The access point acts as an intermediary coordinator between devices wishing to transmit on the secondary channel and the OBSS activity on the primary channel. The AP determines the duration and bandwidth of OBSS activity, selects appropriate secondary channel TXOP parameters, and provides control frames to coordinate transmissions. This intermediary coordination ensures that secondary channel transmissions do not interfere with OBSS activity, maintaining transmission reliability while enabling efficient spectrum utilization.
3Reliability
If access point determines and coordinates TXOP parameters for secondary channel, then transmission reliability is improved through coordinated access, but device complexity increases
Solution Approach 1:
The access point performs self-service by autonomously determining OBSS activity duration and bandwidth, selecting secondary channel TXOP parameters, and providing coordination control frames without requiring complex negotiations with each device. The AP uses its own processing capabilities to manage the coordination process, reducing the complexity burden on individual devices while maintaining reliable coordinated access.
Data Source
AI summary
This disclosure relates to methods for access point coordinated opportunistic secondary channel access in a wireless local area network. Overlapping basic service set transmission may be detected on a primary channel of a link between wireless devices. A transmit opportunity may be initiated on a secondary channel of the link based at least in part on detection of the overlapping basic service set transmission on the primary channel of the link. The transmit opportunity may be initiated with an initial control frame, and a control response frame may be provided in response to the initial control frame. The control response frame may indicate that the transmit opportunity responder has a different preferred duration or bandwidth than indicated by the initial control frame.