Patent ID: RE43949

Claim:
A method for allocating radio resources in a mobile communication system, the method comprising: receiving, by a mobile terminal, grouping information related to one or more preambles for accessing a Random Access Channel (RACH), wherein the one or more preambles are grouped according to an amount of the radio resources requested by the mobile terminal and the received grouping information is used to select at least one preamble group among a plurality of preamble groups; selecting, by the mobile terminal, the at least one preamble group according to a state of the mobile terminal; selecting, by the mobile terminal, at least one preamble from the at least one selected preamble group; transmitting, by the mobile terminal, the at least one selected preamble; receiving, by the mobile terminal, a radio resource allocated according to the at least one selected preamble; and transmitting, by the mobile terminal, data using the allocated radio resource.