Method of converting allocated radio resource mode of MS in wireless access system

A method for allocating a radio-resource mode to a mobile station in a wireless access system, the method performed by the mobile station, the method comprising:ntransmitting a first message for requesting a mode switching from a first radio-resource mode allocated to the mobile station to a second radio-resource mode, the first message including Carrier to Interference and Noise Ratio (CINR) information of the second radio-resource mode; andtransmitting a third message through a high-speed feedback channel when a second message approving the mode switching is not received within a predetermined time;wherein the third message indicating that the mode switching has not been normally performed;wherein the second message is a MAP control message including channel quality information channel (CQICH) allocation information when downlink data is present and a REP-REQ (response-request) message requesting the CINR information when the downlink data is absent.

A method for allocating a radio-resource mode to a mobile station in a wireless access system, the method performed by a base station, the method comprising:nreceiving a first message requesting a mode switching from a first radio-resource mode allocated to the mobile station to a second radio-resource mode, the first message including Carrier to Interference and Noise Ratio (CINR) information of the second radio-resource mode;allocating the second radio resource mode to the mobile station;transmitting a second message approving the mode switching to the mobile station; andretransmitting the second message when a third message is received through a high-speed feedback channel from the mobile station, the third message indicating that the mode switching has not been normally performed;wherein the second message is selected between a MAP control message and the REP-REQ message based on whether downlink data is present or not.