Access Point Channel Synchronization in Wireless Distribution Systems
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Solution Overview
Problem
In Wireless Distribution Systems, channel changes can occur without user knowledge, leading to disconnection of WDS links, especially in the 11a band where Dynamic Frequency Selection is required, making it difficult to maintain stable connections between access points.
Innovation Solution
An access point with a channel change event detector and a channel change control unit that checks the state of a counterpart access point and synchronizes channel changes to maintain the WDS link, using a MAC address table and sync flag register to determine whether to change channels alone or in sync with the counterpart access point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automatic channel selection is used in access points, then channel optimization is improved, but WDS link stability deteriorates due to unsynchronized channel changes
Solution Approach 1:
The access point monitors the operational status of WDS links and detects channel change events in counterpart access points. When a channel change is detected, the system sends notifications to counterpart access points and coordinates channel changes to maintain synchronization, thereby preserving link stability while allowing automatic channel optimization.
Solution Approach 2:
Before executing a channel change, the access point first notifies counterpart access points of the intended channel change. This preliminary action allows the counterpart to prepare for the change, ensuring that both access points transition to the new channel simultaneously, thus preventing link disconnections.
2Object-affected harmful factors
If DFS function is enabled in 11a band, then radar interference avoidance is improved, but channel synchronization between WDS access points deteriorates
Solution Approach 1:
The system continuously monitors for radar signals through DFS functionality. When radar interference is detected in one access point, it triggers a channel change event that is communicated to counterpart access points. The counterpart access points then perform their own radar detection and coordinate channel changes, ensuring both points avoid the interfering frequency simultaneously while maintaining WDS link stability.
Data Source
AI summary
An access point and a method of controlling channel change in the access point. The access point includes: a channel change event detector for checking whether an event of requesting to change a channel used for transmitting and receiving a packet between the access point and a counterpart access point occurs; and a channel change control unit for performing channel change while maintaining channel-synchronization with the counterpart access point constituting a Wireless Distribution System (WDS) link when the channel change event occurs. According to the access point and method, a WDS link is normally maintained even when the channel of an access point is changed.