Patent ID: 7356750
Filing Date: 2008-04-08
Classification: H04L

Abstract:
1. A data transmission method for transmitting data in units of packets, said method comprising: a first step of performing transmission of the packets, each of the packets having a first sequence number indicating a reproduction order of the packet; a second step of receiving a retransmission request for a retransmission packet corresponding to one of the packets in which a transmission error has occurred; a third step of judging whether retransmission of the packet in which a transmission error has occurred, which packet is indicated by the received retransmission request, should be performed or not; and a fourth step of performing, on a basis of the judgment result, transmission of the retransmission packet having a first sequence number that is the same value as a value stored in the packet in which a transmission error has occurred, and a second sequence number indicating a transmission order, which is incremented by 1 every time a retransmission packet is transmitted, and can be used to judge a transmission error in the transmitted retransmission packet.