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802.11r is a protocol for achieving link-layer hand-off between two access points quickly enough that services such as VoIP are not dropped. Essentially this is a patch for the original way 802.11 hand-off was achieved to handle the problems caused by the additional number of message exchanges required for 802.1x and 802.11i. Wikipedia gives a more detailed explanation of the latest amendment of 802.11r.

SOWN is currently investigating achieving 802.11r hand-off using two SOWN[at]HOME nodes.