Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
2005-06-07
2005-06-07
Trinh, Sonny (Department: 2687)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S528000, C370S312000, C370S352000
Reexamination Certificate
active
06904288
ABSTRACT:
A method and apparatus for providing an efficient dormant mode for push-to-talk communication devices in a group communication network provides for determining whether the net has been inactive for a predetermined first time period and, if so, causing each member of the net to enter a control-hold mode, wherein each member of the net maintains its dedicated traffic channel. The method further includes the steps of determining whether each member of the net has been in the control-hold mode for a predetermined second time period and, if so, causing each member of the net to enter a dormant mode, wherein each member of the net releases its dedicated traffic channel. The method and apparatus further provides for causing each member of the net to cache its service configuration state before entering the dormant mode.
REFERENCES:
patent: 5745860 (1998-04-01), Kallin
patent: 5884196 (1999-03-01), Lekven et al.
patent: 6032050 (2000-02-01), Hasegawa
patent: 6477150 (2002-11-01), Maggenti et al.
patent: 6714987 (2004-03-01), Amin et al.
Maggenti Mark
Rosen Eric
Bhattacharya Sam
Ciccozzi John L.
O'Connell Robert J.
Qualcomm Incorporated
Trinh Sonny
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