| 摘要 |
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.
|
