Appeal No. 1999-1515
Application No. 08/451,719
telephony system in which a mobile terminal communicates with
a fixed base station over a wireless link. More particularly,
a method and apparatus is provided for establishing a seamless
transfer or “hand-off” of communication with the mobile
terminal to a further base station when communication quality
deteriorates. As part of the “hand-off” technique, while a
first two-way call is established between the mobile terminal
and a base station, a second communication channel is used to
search for another base station to establish a second two-way
call with the mobile terminal. This second two-way call,
established while the first two-way call exists, is a
duplicate of the first call and is superimposed upon it. On
detection of a degradation of the quality of the first call,
the mobile terminal initiates a transfer of communication to
the second communication channel by simultaneously switching
the two-way signals from the first communication link to the
second communication link.
Claim 18 is illustrative of the invention and reads as
follows:
18. A method for providing communication
between a mobile terminal and a plurality of
unsynchronized base stations comprising the steps
2
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