Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2007-09-25
2007-09-25
D'Agosta, Steve M. (Department: 2617)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S436000, C455S438000, C455S466000, C455S440000, C455S442000, C455S443000, C455S450000, C370S331000, C370S332000, C370S333000, C370S334000, C370S355000
Reexamination Certificate
active
11176652
ABSTRACT:
A method and base station controller (BSC) in a GPRS/EDGE cellular radio telecommunication system for controlling a handover of a mobile station (MS) conducting both a circuit-switched call and a packet data session, and for rapidly reestablishing the packet data session. The BSC determines from measurement reports that a handover of the MS is imminent. The BSC sends both packet system information and Dual Transfer Mode (DTM) information relevant in the target cell to the MS prior to a handover command. When the handover is complete, the BSC may also send a pseudo cell update message to a serving SGSN. The message includes an identifier of the MS and appears to the SGSN to be from the MS. After the circuit-switched call is reconnected, the packet data session is rapidly reestablished utilizing the information sent to the mobile station prior to the handover command, and without having to send a cell update message from the MS.
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Balachandran Kumar
Ramesh Rajaram
D'Agosta Steve M.
Telefonaktiebolaget LM Ericsson (publ)
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