Patent ID: 8400988

Claim:
A transmission method for a Multiple Radio Transmission (MRT) entity of a transmitter in a radio communication system comprising the transmitter and a receiver, the transmission method comprising: transmitting, to a MRT entity of the receiver, data in packets comprising a first packet and a second packet; receiving, from the MRT entity of the receiver, a request for retransmission of the first packet at a time of the transmission of the first packet; and receiving, from the MRT entity of the receiver, a negative-acknowledge (NACK) message with respect to the transmission of the first packet after the transmission of the first packet and the second packet, wherein the transmitter comprises a MRT sub-layer comprising the MRT entity for an upper layer service, and a Radio Access (RA) sub-layer comprising at least two RA entities configured to manage at least two RA interfaces, respectively, the at least two RA interfaces configured to communicate through different frequency spectrums, respectively, wherein the MRT entity of the transmitter is configured to transmit, to the at least two RA entities, the packets, which are assigned differently among the at least two RA entities, and wherein the at least two RA entities are further configured to divide the respective packets into sub-packets for transmission.