A bandwidth request method for use in a communication system including a base station (504, 604) and a mobile station (502, 602), wherein the base station communicates with the mobile station using multiple carriers including one or more primary carriers and one or more secondary carriers, the one or more primary carriers and one or more secondary carriers each operating with an individual frequency band and frame structure, the method comprising: determining, by the mobile station, for communication connections for which a bandwidth request is to be sent, a quality of service, QoS, of each of the communication connections, wherein the communication connections are established on the multiple carriers; and sending to the base station, by the mobile station, a bandwidth request for the communication connections on one primary carrier of the multiple carriers based on the determination, wherein when it is determined by the mobile station that the communication connections have different QoS classes, the method further comprises: separating, by the mobile station, the communication connections into a plurality of groups of communication connections, each of the groups having a same QoS class; calculating, by the mobile station, a total bandwidth required for each of the groups of communication connections, to thereby generate a plurality of calculated total bandwidths corresponding to each of the groups of communication connections; sending, by the mobile station, separate bandwidth requests on the primary carrier when a random access to one of the multiple carriers is achieved, each of the separate bandwidth requests being for one of the plurality of the calculated total bandwidths, wherein each of the bandwidth requests comprises a group connection identifier. determining, by the mobile station, for communication connections for which a bandwidth request is to be sent, a quality of service, QoS, of each of the communication connections, wherein the communication connections are established on the multiple carriers; and sending to the base station, by the mobile station, a bandwidth request for the communication connections on one primary carrier of the multiple carriers based on the determination, wherein when it is determined by the mobile station that the communication connections have different QoS classes, the method further comprises: separating, by the mobile station, the communication connections into a plurality of groups of communication connections, each of the groups having a same QoS class; calculating, by the mobile station, a total bandwidth required for each of the groups of communication connections, to thereby generate a plurality of calculated total bandwidths corresponding to each of the groups of communication connections; sending, by the mobile station, separate bandwidth requests on the primary carrier when a random access to one of the multiple carriers is achieved, each of the separate bandwidth requests being for one of the plurality of the calculated total bandwidths, wherein each of the bandwidth requests comprises a group connection identifier. separating, by the mobile station, the communication connections into a plurality of groups of communication connections, each of the groups having a same QoS class; calculating, by the mobile station, a total bandwidth required for each of the groups of communication connections, to thereby generate a plurality of calculated total bandwidths corresponding to each of the groups of communication connections; sending, by the mobile station, separate bandwidth requests on the primary carrier when a random access to one of the multiple carriers is achieved, each of the separate bandwidth requests being for one of the plurality of the calculated total bandwidths, wherein each of the bandwidth requests comprises a group connection identifier.