Motorola Corporation

Nigel M May

Mark L Shaughnessy

Bradley Robert Schaefer

Mark A Marick

William J Sugden

A proactive speculation method decreases the call setup time for private calls () and selective dynamic group calls (). In a push-to-talk dispatch network () an originating mobile unit () sends a wake-up packet () to the dispatch network (). Prior to initiating the push-to-talk function, the target mobile units () receive a wake-up packet () from network (). 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 () may be sent.

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Phoenix, AZ, United States of America

Nigel M May