A fast roaming (handoff) service is provided for a WLAN infrastructure. A given mobile station (STA) obtains a pairwise master key (PMK) when it associates with an access point (AP) in the infrastructure. A neighbor graph identifies prospective APs to which the STA may then roam. At initialization, preferably...http://www.google.de/patents/US7873352?utm_source=gb-gplus-sharePatent US7873352 - Fast roaming in a wireless network using per-STA pairwise master keys shared across participating access points
