Patent ID: 8611266
Filing Date: 2013-12-17
Classification: H04W,Y02D

Abstract:
1. A power control apparatus of a terminal supporting a voice over internet protocol (VoIP) service in a wireless communication system, comprising: a user interface unit configured to include a voice CODEC using in the VoIP service; a controller configured to be connected to the user interface unit, include predetermined application programs including a VoIP application program, and control signaling for setting up a VoIP service call and canceling the VoIP service call; and a medium access control (MAC) processor configured to perform a medium access control function and include a timer unit in order to transmit a trigger frame for beginning a unscheduled-service period (U-SP), by receiving a VoIP service call setup signal and a VoIP service call cancel signal from the controller, wherein, when the VoIP service call is not set up, in a delivery-enabled state of four access categories, the MAC processor receives a beacon frame from an access point (AP), analyzes a traffic indication message included in the beacon frame, determines whether data are buffered or not in the AP, when the AP has the buffered data, transmits the trigger frame to the AP, and receives the buffered data from the AP receiving the trigger frame.