Patent ID: 7558535

Claim:
A method of determining an uplink power control mode in a broadband wireless communication system supporting an open loop power control and a closed loop power control, the method comprising: transmitting a power control change request message from a subscriber station (SS) to base station (BS) to change a power control mode; deciding, by the BS, to change the power control mode between the open loop power control and the closed loop power control; and transmitting a power control change response message from the BS to the SS including the decided power control mode, wherein the power control change response message includes a power control mode change field indicating the decided power control mode, a start frame field indicating a frame number as to when the indicated power control mode is activated, a power adjust field indicating a change in power level that the SS should apply to its current transmission power, if the indicated power control mode is the closed-loop power control, and an Offset perSS field indicating a change in power level that the SS should apply to an open loop power control formula, if the indicated power control mode is the open-loop power control.