Methods and apparatuses are provided for communication between a user equipment (UE) and a node B in a communication system. The UE generates a media access control protocol data unit (MAC PDU) including at least one field related to an amount of data, if the data becomes available for transmission. The MAC-PDU including the at least one field related to the amount of data is transmitted to the node B. Grant information is received from the node B. The data is transmitted to the Node B based on the grant information. Each of the at least one field related to the amount of data corresponds to a respective identifier.