Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
2011-07-19
2011-07-19
Lee, John (Department: 2618)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S518000, C455S517000, C455S452100
Reexamination Certificate
active
07983707
ABSTRACT:
A push-to-talk communications device (PCD) provides improved push-to-talk (PTT) communications. The PCD may include a PTT activator and a PTT module having a buffer and communications logic for providing full duplex PTT communications. In a Point-to-Point PTT mode of operation, PTT communications are performed between two PCDs with the PCDs exercising floor control. After the establishment of communications between the PCDs, the PCDs may enter a PTT talk mode wherein messages are transmitted between the PCDs in real time when a PTT activator is engaged. A PCD may also enter a group PTT mode wherein a PTT server exercises floor control between an initiating PCD and multiple target PCDs.
REFERENCES:
patent: 2004/0266468 (2004-12-01), Brown et al.
patent: 2005/0124367 (2005-06-01), Hassan et al.
patent: 2005/0180394 (2005-08-01), Kautz et al.
patent: 2006/0063553 (2006-03-01), Iyer et al.
AT&T Mobility II LLC
Lee John
Murray, Esq. Mickki D.
Parks IP Law LLC
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