METHOD AND APPARATUS FOR GENERATING RADIO LINK CONTROL PROTOCOL DATA UNIT FOR MULTI-CARRIER OPERATION

PROBLEM TO BE SOLVED: To efficiently determine the radio link control (RLC) PDU size for multi-carrier operation.SOLUTION: A WTRU calculates a maximum amount of data allowed for a current transmission time interval (TTI) for each of a plurality of carriers, and selects an RLC PDU data field size such that each RLC PDU to be multiplexed to a medium access control (MAC) PDU matches a minimum of the maximum amount of data calculated for the carriers. The maximum amount of data is calculated on the basis of an applicable current grant for each carrier for the current TTI. The RLC PDU may be generated for the later TTI on a condition that an amount of data in outstanding pre-generated RLC PDUs for a particular logical channel is less than or equal to 4N times the minimum of the maximum amount of data allowed to be transmitted by the applicable current grant for the carriers for the current TTI, where N is the number of activated carriers.