Patent ID: 8060080
Filing Date: 2011-11-15
Classification: H04W,Y02D

Abstract:
1. A portable communication system for identifying information on a destination terminal in a power-off state, the system comprising: a portable terminal for, upon checking that a battery voltage of the portable terminal is less than a predefined threshold value, forwarding a Mobile Switching Center (MSC) information notifying the MSC that the portable terminal can power-off because of a low battery voltage; and the MSC for, upon receipt of the information from the portable terminal, registering the information that the battery voltage of the portable terminal is in a low state in a Home Location Register (HLR), wherein upon receipt of a request for a call connection, when checking the HLR and identifying the power-off state of the destination terminal intended for the call connection, the MSC checks whether the destination terminal is in the power-off state because of the low battery voltage: wherein when checking that the destination terminal is in the power-off state because of the low battery voltage, the MSC forwards information to an originating MSC, notifying the originating MSC that the call connection with the destination terminal cannot be performed because of the low battery voltage; and wherein the originating MCS sends a message to the originating terminal, indicating that the destination terminal is in the power-off state because of the low battery voltage and the call connection is disabled.