FIELD: communication.
SUBSTANCE: invention relates to a wireless communication system using communication resource allocation and a transmission of both large amounts of data and small amounts of data transmitted relatively infrequently. According to first aspect of present invention disclosed is a base station for receiving uplink data transmitted from mobile terminals of a first type and mobile terminals of a second type over a radio interface using a plurality of sub-carriers, mobile terminals of a first type being arranged to transmit uplink data on a first group of sub-carriers of plurality of sub-carriers over a first bandwidth and mobile terminals of second type being arranged to transmit uplink data on a second goup of sub-carriers of plurality of sub-carriers within first group of sub-carriers over a second bandwidth, second bandwidth being smaller than first bandwidth, and base station is arranged to grant uplink radio resources in response to random access request messages transmitted by mobile terminals of first type transmitted on a first random access channel and to grant uplink radio resources in response to random access request messages transmitted by mobile terminals of second type transmitted on a second random access channel, wherein random access request messages transmitted on second random access channel are transmitted on sub-carriers within second group of sub-carriers.
EFFECT: transmission of large amounts of data.
10 cl, 19 dwg
