Coordinated AP Primary Channel Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication networks, particularly in coordinated AP sets, primary channel switching can lead to issues such as loss of multi-AP coordination and degraded transmission quality due to hidden node interference or APs operating on different channels, which disrupts the coordinated AP set and affects transmission efficiency.
Innovation Solution
A proposed procedure involving a Channel Switch Request frame and response mechanism between APs to coordinate primary channel switching, ensuring that all APs in a coordinated set switch to a new channel simultaneously, using Extended Channel Switch Announcement elements to manage the transition and maintain multi-AP coordination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an AP switches its primary channel independently to improve its own transmission quality, then its transmission quality improves, but the coordinated AP set is disrupted and other APs cannot maintain coordination
Solution Approach 1:
The patent merges the channel switching decisions of multiple APs by requiring them to operate on a common primary channel. The coordinator AP consolidates channel switching requests from multiple APs and ensures they all switch to the same channel simultaneously, maintaining the coordinated AP set while improving transmission quality for all participants.
Solution Approach 2:
The patent implements a feedback mechanism where APs send channel switching requests to a coordinator AP, which then distributes the coordinated switching decision back to all APs. This feedback loop ensures that all APs remain synchronized on the primary channel while allowing individual APs to request channel changes for improved transmission quality.
2Adaptability or versatility
If APs switch channels at different times to allow flexible channel selection, then channel selection flexibility improves, but hidden node interference increases and transmission efficiency degrades
Solution Approach 1:
The patent applies preliminary action by having the coordinator AP collect and process channel switching requests from multiple APs before executing the switch. The coordinator determines a common switching time and notifies all APs in advance, allowing them to prepare for simultaneous switching. This maintains channel selection flexibility while preventing hidden node interference through synchronized execution.
3Reliability
If primary channel switching is allowed to improve transmission quality, then transmission quality improves, but the complexity of coordinating multiple APs increases
Solution Approach 1:
The patent extracts the coordination complexity from individual APs by designating a specific coordinator AP that centralizes the channel switching decision-making process. Individual APs only need to send requests to the coordinator and follow its instructions, rather than independently coordinating with all other APs. This reduces the coordination complexity at each AP while still achieving improved transmission quality through coordinated switching.
Data Source
AI summary
A first access point (AP) transmits to a second AP a first frame comprising a request to the secondAP to switch a channel of operation from a first channel to a second channel. The first AP and the second AP may be members of a coordinated AP set. The first AP receives from the second AP a second frame comprising one of: an indication of acceptance or rejection of the request or an indication of a third channel. The first AP transmits to one or more associated stations a third frame indicating, based on the second frame: the first channel as the channel of operation or a switch of the channel of operation from the first channel to the second channel or to the third channel.