Resource assignment in an enhanced uplink mobile communication system

A wireless subscriber communication unit is provided for operation in a cellular communication system having a plurality of shared uplink and downlink transmission resources, each divided into sets of mutually exclusive resources. The shared uplink transmission resources are defined in terms of codes and timeslots. The communication unit comprises a receiver, control, and transmitter unit. The receiver unit receives scheduling information including an assignment of a scheduled uplink transmission resource from the shared uplink transmission resources from a network infrastructure apparatus. The control unit derives an uplink resource identifier related to the scheduled uplink transmission resource from the received scheduling information. The transmitter unit transmits an uplink transmission, which includes the uplink resource identifier, using the scheduled uplink transmission resource. The control unit receives a downlink transmission associated with the uplink transmission on a downlink transmission resource determined from at least one of the received scheduled uplink resource or identifier.