Patent ID: 7366131

Claim:
A power saving method for a mobile communication terminal, the method comprising: receiving a slot mode adjustment request from a mobile communication terminal for a first slot cycle index (SCI) to replace a second SCI used for communication between a base station and the mobile communication terminal, such that the second SCI is larger than the first SCI to save battery power of the mobile communication terminal in a first mode, wherein the first mode is activated in response to a user interaction with a user interface of the mobile communication terminal, wherein the first mode is distinct from a push-to-talk mode; processing the slot mode adjustment request to determine whether the first SCI is supported by the base station; and acknowledging the slot mode adjustment request, when the first SCI is supported by the base station, wherein the slot mode adjustment request is transmitted from the mobile communication terminal to the base station via a registration message, and wherein the registration message comprises at least one of a timer-based registration, power-up registration, zone-based registration, power-down registration, parameter-change registration, ordered registration, distance-based registration, and user zone-based registration.