Importance

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Abstract

A preferred embodiment of the present invention provides a method for extending battery life in a subscriber unit in contact with a system node of a wireless communication network. The method establishes a current inactivity level. The method then periodically checks the state of a power failure flag (which is set when line power is not available and clear otherwise). When the power failure flag is clear and there is no line power present, the method sets the power failure flag and sets a timer to expire after a period of time based on the current inactivity level. When the power-failure flag is set and line power is present, the method clears the power failure flag and performs a default inactivity level registration with the system node requesting to use the system default inactivity level. When the power failure flag is set, no line power is present, the timer has expired, and the current inactivity level is not the system maximum inactivity level, the method performs an incremental inactivity level registration with the system node requesting to use the next highest inactivity level.

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First Claim