Patent ID: 7912425

Claim:
A method of receiving and transmitting information for an uplink in a mobile communication system, the method comprising: acquiring, at a mobile terminal, a downlink synchronization with a base station; receiving, by the mobile terminal, an uplink channel descriptor (UCD), including first ranging region information related to a first allocation region for at least a ranging request or an uplink bandwidth request, from the base station; receiving, by the mobile terminal, an uplink map information element, including second ranging region information related to a second allocation region for at least the ranging request or the uplink bandwidth request, from the base station; and transmitting, by the mobile terminal, codes related to at least the ranging request or the uplink bandwidth request to the base station, using the second ranging region information since the second ranging region information has priority over the first ranging region information, wherein the first ranging region information includes first fields of an orthogonal frequency division multiple access (OFDMA) symbol offset, a sub-channel offset, a number of OFDMA symbols, a number of sub-channels and a ranging method, and the second ranging region information includes second fields of an OFDMA symbol offset, a sub-channel offset, a number of OFDMA symbols, a number of sub-channels and a ranging method.