Patent ID: 7860056

Claim:
A method for allocating a sub-channel in a wireless communication system, the method comprising the steps of: measuring a moving velocity of each of mobile stations (MSs); selecting at least one MS, to which a sub-channel is to be allocated, among the MSs; identifying a type corresponding to a moving velocity of the at least one MS; determining a sub-channel allocation period for sub-channel allocation to the at least one MS depending on the identified type; calculating an average amount of data to be transmitted for the determined sub-channel allocation period, and transmitting a channel quality information (CQI) request to the at least one MS; allocating a sub-channel satisfying the average data amount taking a CQI into account, to the at least one MS, when the CQI is received from the at least one MS; transmitting a control signal for the sub-channel allocation to the at least one MS; and determining a frame interval according to the determined sub-channel allocation period, wherein a number of frames included in the determined frame interval is determined depending on the measured moving velocity, and is expressed as N k ⁡ [ t ] = ⌊ 9 16 ⁢ π ⁢ c f c ⁢ υ k ⁡ [ t ] ⁢ 1 L f ⁢ ΔϖΔτ ⌋ where N k [t] represents a number of frames in a t th frame interval allocated to a k th MS, c denotes a propagation velocity of electromagnetic waves, f c denotes a carrier frequency, v k [t] denotes a moving velocity of the k th MS in a t th frame, L f denotes a frame length, Δω denotes a moving velocity estimation error factor of the k th MS, and Δτ denotes a CQI estimation error factor.