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Tutorial: A Custom Hopping MAC
based on Ref. Des. v1.3
802.11 Reference Design
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Slow Hopping Approach
Among many other enhancements, the 2003 802.11h amendment added the "Channel Switch Announcement" as an optional tagged parameter in management frames (e.g. beacons). Section 8.4.2.21 of 802.11-2012 describes the element. It contains a "New Channel Number" field that describes, as you might expect, the new channel that associated stations should tune to. Additionally, it contains a "Channel Switch Count" which tells STAs when they should tune to the new channel. A value of 0 informs them that they should tune immediately while any value N for N > 0 informs them they should tune immediately before the beacon Nth Target Beacon Transmission Time (TBTT). Since beacons are multicast and have no error recovery, a large value of N increases the reliability of client stations tuning to the new channel since they only need to overhear one of the N beacons to properly schedule the retuning event.
