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Hi all,
I wonder if some of you have followed the past discussions within DNA around how to define link up and link down. Defining "link up", "link going down" and "link down" are of the biggest importance to 802.21 because it will be our ability to precisely to give the most meaningful definition to those terms that will render possible the work of media specific groups in the attempt to specify the exact states of link layer protocols when the event should be fired.
For example 802.21 identifies the need for a "link going-down" indication to be sent to the MIH in order to prepare handoff in make before break scenarios. The group has to move into the work of specifying exactly what link going down means. The 802.11 RSSI is an indication which variation within any time window can not be relied upon to ascertain that the 802.11 link is going down (simply because the RSSI itsef is everything but reliable). 802.11k is trying to define a signal power level that is more reliable than the RSSI. It might still be time for .21 to help shape the specification of that parameter 11k is trying to come up in the way that its variation in time be more reliable thant RSSI's.
If there is any 802.11k working group member on this list they may want to give more developments than i can.
Eric Njedjou