Push-to-talk call setup for a mobile packet data dispatch...

Details Push-to-talk call setup for a mobile packet data dispatch... Push-to-talk call setup for a mobile packet data dispatch...

2007-06-12

2007-06-12

Gesesse, Tilahun (Department: 2618)

Telecommunications

Transmitter and receiver at separate stations

Plural transmitters or receivers

C455S517000, C455S518000, C370S342000, C370S441000

Reexamination Certificate

active

10323428

ABSTRACT:
A proactive speculation method decreases the call setup time for private calls (200) and selective dynamic group calls (300). In a push-to-talk dispatch network (40) an originating mobile unit (10) sends a wake-up packet (54, 114) to the dispatch network (40). Prior to initiating the push-to-talk function, the target mobile units (20–30) receive a wake-up packet (68, 146–148) from network (40). Thereby, prior to establishing the push-to-talk function, each of the mobile units in the push-to-talk call have been coupled via RF links. If the originating mobile unit has a current IP address, direct wake-up packets (72) may be sent.

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