Patent ID: 7706334

Claim:
A method for a transmitting end device to transmit a data packet to a receiving end device in a packet data communication system using hybrid automatic repeat request, the method comprising: forming an encoded data packet at the transmitting end device, the encoded data packet generated by encoding information to be transmitted to the receiving end device; generating a first sub packet from the encoded data packet at the transmitting end device, the first sub packet having a first sub packet length and a first sub packet identifier assigned to the first sub packet; transmitting the first sub packet from the transmitting end device to the receiving end device; generating a second sub packet at the transmitting end device from the encoded data packet for a retransmission of the encoded data packet, the second sub packet having a second sub packet length and a second sub packet identifier assigned to the second sub packet, wherein the second sub packet identifier is used to identify a starting point of the second sub packet in the encoded data packet under an assumption that the first sub packet length corresponds to the second sub packet length; and transmitting the second sub packet from the transmitting end device to the receiving end device.