In a wireless network system having a wired backbone network with two or more sub-networks, each having one or more access points for communicating with wireless units via a wireless transmission medium, a system, apparatus and method for a wireless unit to determine whether a candidate access point...http://www.google.com/patents/US7082114?utm_source=gb-gplus-sharePatent US7082114 - System and method for a wireless unit acquiring a new internet protocol address when roaming between two subnets
