Appeal No. 96-3047
Application 08/053,191
The disclosed invention pertains to a wireless mobile
subscriber network where to achieve bidirectional
communication cellular systems have been devised in which a
service area is divided into smaller zones, each zone having a
radio transmitter/receiver that is connected to the network by
a wire line and may be connected to mobile units across an air
interface. The radio transmitter/receiver functions as a
network access point. The invention desires to have a
wireless network which has tetherless access in which, as the
mobile unit moves about, different network access points
cooperate to provide a seamless, uninterrupted service to the
mobile unit. When the mobile unit moves out of the range of a
current network access point, it must be switched over to a
successor network access point. This switchover between
network access points is known as "handoff". The capability
of handing off a mobile unit from one network access point to
another makes possible "roaming" of mobile units from cell to
cell. Roaming has not been hitherto possible in certain
networks such as Novell networks, which require that the
network ID of a node remain constant during a session. In
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