Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2003-11-26
2009-02-03
Lee, John J (Department: 2618)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S436000, C455S525000, C455S452100
Reexamination Certificate
active
07486953
ABSTRACT:
Soft handover of a mobile unit is facilitated on a wireless network from base station to base station. The network can employ multi-channel receivers to receive signals from mobile units within range, including mobile units assigned to neighboring base stations. Information associated with received signals, such as an indication of their signal strength, can be relayed to a central location for assessing whether the mobile unit should be assigned to another base station, and implement reassignment of one or more mobile units based on such assessment. Soft handover reduces dropped calls when the connection from mobile to base station is unexpectedly lost. The second BTS can add a carrier to communicate with the mobile unit and provides the mobile unit with the necessary parameters, such as frequency and time slot data, to complete the handover or the connection can be established through a variety of contingency plans.
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Lee John J
Northrop Grumman Corporation
Tarolli, Sundheim Covell & Tummino LLP
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