Patent ID: 6088600
Filing Date: 2000-07-11
Classification: H04W,Y02D

Abstract:
A method for controlling data communication in an analog cellular modem so as to minimize power consumption, the method comprising the steps of:establishing a cellular data connection between a data communication device coupled to the analog cellular modem and a far-end data endpoint;monitoring the cellular data connection for the existence of a data signal from the data communication device;switching to an inactive state when the data signal does not exist for a predefined period of time;transmitting an inactive signal to the far-end data endpoint;receiving an acknowledgment signal from the far-end data endpoint, the acknowledgment signal indicating that the far-end data endpoint has received the inactive signal;transmitting a mobile phone power-down signal to the mobile phone to switch a transceiver of the mobile phone to a low power state, thereby reducing power consumption; andperiodically powering up the mobile phone and performing a quick retrain with the far-end data endpoint while in the inactive state during a continued absence of the data signal.