Patent ID: 7263064

Claim:
A packet transmission method for transmitting packets classified according to a quality of service (QoS) requirement from a transmitting node to a receiving node, the packet transmission method comprising the steps of: in the transmitting node, selecting sequentially a QoS class; dividing each IP queued packet to be transmitted, which belongs to the selected class, into a plurality of predetermined data units, wherein a length of the predetermined data unit is set shorter than a length of an average size IP data packet; transmitting one of the predetermined data units; and applying a transmitter-side retransmission control process to the data unit to be transmitted when the selected class is a QoS class specified for data type packets; in the receiving node, receiving sequentially the data unit transmitted from the transmitting node; applying a receiver-side retransmission control process to the received data unit to be assembled when the received data unit belongs to one of the QoS classes specified for the data type packets; and assembling a plurality of received data units to restore an original packet in each QoS class.