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2009 Industrial Wireless Guidebook
Understanding Industrial WLAN – IEEE 802.11
2
Roaming Speed Acceleration
To increase the roaming speed, a common method is to use the Threshold-based Handover Algorithm.
The Threshold-based Handover Algorithm allows roaming only when the current AP’s signal drops below a
certain threshold so that roaming to another AP would improve the transmission quality and at the same time
provide a stronger signal.
certain threshold so that roaming to another AP would improve the transmission quality and at the same time
provide a stronger signal.
In short, the Threshold-based Handover Algorithm means the client will constantly scan for the best AP signal
quality and roam only when the threshold is reached. This can prevent the ping-pong effect, unnecessary
handovers that might take place when the client moves back and forth between two APs. Also, this can
increase the roaming speed to deliver a smoother data transmission.
quality and roam only when the threshold is reached. This can prevent the ping-pong effect, unnecessary
handovers that might take place when the client moves back and forth between two APs. Also, this can
increase the roaming speed to deliver a smoother data transmission.
The second way to increase the roaming speed is to unify AP channels to avoid wasting channel hopping time
during roaming. However, a unified channel selection will also cause interference. Users are advised to make
proper channel separation among roaming APs to reduce interference.
during roaming. However, a unified channel selection will also cause interference. Users are advised to make
proper channel separation among roaming APs to reduce interference.