An apparatus and method for performing duplicate avoidance of broadcast data packets in a (UE). The includes receiving a broadcast data packet from a plurality of cells; storing, if a sequence number of the received broadcast data packet does not fall within a reception window, the broadcast data packet in a buffer and updating the reception window based on the sequence number; determining, if the sequence number of the received broadcast data packet falls within the reception window, whether a broadcast data packet having the sequence number has previously been stored in the buffer; discarding the broadcast data packet, if the broadcast data packet has previously been stored in the buffer; and storing the broadcast data packet in the buffer, if the broadcast data packet has not previously been stored in the buffer.