Patent ID: 8116246
Filing Date: 2012-02-14
Classification: H04W

Abstract:
1. A method for transmitting data based on an operational state of a mobile station by a base station in a communication system, the method comprising: when detecting a low battery state of the mobile station, storing one or more data packets to be transmitted to the mobile station; extracting at least one data packet among the data packets based on a maximum allowable delay time of the data packet and a transmission delay time delayed before the stored data packet is transmitted to the mobile station; transmitting at least a part of the extracted at least one data packet to the mobile station by using a resource allocated to the mobile station; and controlling a transmission power of the mobile station based on an estimated data packet transmission rate and estimated data packet delay time, when the base station detects a low battery state of the mobile station, wherein the controlling of the transmission power comprises transmitting a command for lowering the transmission power of the mobile station when the estimated data packet transmission rate exceeds a minimum transmission rate for the communication system in order to guarantee a service quality of a corresponding connection and when the estimated data packet delay time is less than a maximum delay time for the communication system in order to guarantee the service quality of the corresponding connection.