Non-Primary Channel Switching for OBSS Bandwidth Utilization
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Solution Overview
Problem
In wireless communication networks, when a primary channel is occupied by an overlapping basic service set (OBSS) transmission, the remaining bandwidth is often unutilized as wireless communication devices cannot successfully contend for the primary channel, leading to inefficiencies in bandwidth utilization.
Innovation Solution
A wireless communication device switches to a second primary channel based on determining that a threshold duration has elapsed from the end of a frame initiating a transmission opportunity, or upon receiving an indication of a physical layer protocol data unit (PPDU) satisfying certain criteria, allowing it to communicate on the second primary channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless communication devices contend for access via the primary channel, then channel access is achieved, but bandwidth utilization is reduced when the primary channel is occupied by OBSS transmissions
Solution Approach 1:
The patent segments the channel access process into two independent stages: primary channel contention (for access right) and secondary channel transmission (for actual data transfer). This allows devices to win access on the primary channel even when OBSS occupies the secondary channel, thereby resolving the contradiction between reliable channel access and bandwidth utilization.
Solution Approach 2:
The patent introduces a secondary channel as an intermediary for actual data transmission, separating it from the primary channel's access contention function. This intermediary mechanism allows the system to maintain bandwidth utilization by using the secondary channel for data transfer even when the primary channel is blocked by OBSS.
2Reliability
If devices wait for primary channel availability, then successful transmission is achieved, but transmission delay increases due to unutilized bandwidth
Solution Approach 1:
The patent implements preliminary action by having devices contend for and secure access rights on the primary channel before actual data transmission occurs on the secondary channel. This preliminary contention phase ensures transmission success while the actual data transfer begins immediately on the secondary channel, minimizing transmission delay.
Solution Approach 2:
The patent introduces dynamic channel switching capability, allowing the transmission path to be flexible between primary and secondary channels based on real-time OBSS conditions. This dynamic adaptation enables the system to maintain both transmission success and minimal delay by selecting the optimal channel at the moment of transmission.
3Device complexity
If the primary channel is used for both access contention and data transmission, then system simplicity is maintained, but bandwidth efficiency is reduced
Solution Approach 1:
The patent segments the wireless communication system into two distinct functional channels: a primary channel for access contention and a secondary channel for data transmission. This segmentation increases system complexity slightly but dramatically improves bandwidth efficiency by allowing parallel operations on both channels without interference.
Solution Approach 2:
The patent implements multi-functionality where the primary channel serves dual purposes: access contention and potential data transmission when no OBSS is present. The secondary channel provides universal data transmission capability regardless of primary channel status, thereby achieving high bandwidth efficiency through functional expansion rather than simple duplication.
Data Source
AI summary
This disclosure provides methods, components, devices and systems for non-primary channel access switching conditions. Some aspects more specifically relate to first wireless communication device may receive an indication of a frame initiating a transmission opportunity associated with an upcoming data transmission on a first primary channel. In some examples, the first wireless communication device may switch to a second primary channel based on determining that a threshold duration has elapsed from an end of the frame initiating the transmission opportunity. In some examples, the first wireless communication device may receive an indication of a physical layer protocol data unit (PPDU) associated with an upcoming data transmission on the first primary channel. In some examples, the first wireless communication device may switch to a second primary channel based on a length of the PPDU satisfying a threshold value and on the PPDU being an inter-basic service set (inter-BSS) PPDU.