Patent ID: 8411647

Claim:
A terminal, comprising: a preamble transmitter to transmit a first preamble to a base station using an uplink carrier; a receiver to receive, in response to the first preamble, information defining a first wireless resource of the uplink carrier using a first downlink carrier selected from a plurality of downlink carriers; and a data transmitter to transmit first uplink data to the base station using the first wireless resource, wherein a second preamble having the same value as the first preamble, is transmitted from a second terminal to the base station receivers, in response to the second preamble, information defining a second wireless resource of the uplink carrier is transmitted from base station receivers to the second terminal using a second downlink carrier selected from a plurality of downlink carriers, the second downlink carrier is selected from the plurality downlink carriers and is different from the first downlink carrier, a second uplink data is transmitted from the second terminal to the base station receiver using the second wireless resource, and the receiver receives, from the base station, information defining a primary carrier selected from the first downlink carrier and the second downlink carrier, and priorly receives downlink data from the base station using the primary carrier.