Patent ID: 7962131

Claim:
A method for converting a channel mode from a first channel mode to a second channel mode in a wireless portable Internet system, the channel mode converting method comprising: (a) receiving from a terminal a channel mode conversion request message for requesting conversion from a first channel to a second channel, and transmitting a second channel quality information request message to the terminal according to the channel mode conversion request message; (b) allocating an uplink resource for responding to the second channel quality information request message to the terminal when a predetermined number of frames have passed after transmitting the second channel quality information request message; and (c) converting the terminal channel from the first channel to the second channel according to a response message including first channel quality information transmitted through the uplink resource, wherein in (a), the channel mode conversion request message is transmitted from the terminal when a number of bands satisfying that an entire Carrier to Interference Noise Ratio (CINR) of the second channel is greater than a reference value, and an average CINR value measured during a predetermined time is below a maximum standard deviation and is greater than a predetermined number.