Patent ID: 8379646

Claim:
A method for processing one or more protocol data units (PDUs) at a radio link control (RLC) layer in a mobile communication system, the method comprising: receiving parameters related to an unacknowledged mode (UM) operation from an upper layer, the parameters including an indication indicating whether a re-ordering function is used in the UM; and receiving the one or more PDUs from a single transmitting end via a common control channel (CCCH), wherein the one or more PDUs received from the single transmitting end via the CCCH are not re-ordered when the indication indicates that the re-ordering function is not used in the UM, and wherein when the indication indicates that the re-ordering function is used in the UM: the parameters further include a size of a receive window and a value of a timer, and the one or more PDUs repeatedly transmitted from the single transmitting end via the CCCH are re-ordered using the receive window, the timer and sequence numbers of the received one or more PDUs.