Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
2005-06-28
2005-06-28
Trinh, Sonny (Department: 2687)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S528000, C370S312000, C370S352000
Reexamination Certificate
active
06912401
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 communication device has been inactive for a predetermined first time period and, if so, causing the communication device to enter a control-hold mode, wherein the communication device maintains its dedicated traffic channel. The method further includes the steps of determining whether the communication device has been in the control-hold mode for a predetermined second time period and, if so, causing the communication device to enter a dormant mode, wherein the communication device releases its dedicated traffic channel. The method and apparatus further provides for causing the communication device to cache its service configuration state before entering the dormant mode.
REFERENCES:
patent: 6477150 (2002-11-01), Maggenti et al.
patent: 6714987 (2004-03-01), Amin et al.
patent: 2001/0010687 (2001-08-01), Lee et al.
patent: 2001/0024431 (2001-09-01), Koo et al.
Maggenti Mark
Rosen Eric
Bhattacharya Sam
Ciccozzi John L.
O'Connell Robert J.
Qualcomm Incorporated
Trinh Sonny
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