Patent ID: 7616661

Claim:
A method of transmitting a bit stream in a communication network from a first terminal to a second terminal, the method comprising: (a) coding source data into the bit stream using a predetermined type of coding; (b) adding a header from each communication protocol layer to a payload while transmitting the bit stream coded in operation (a) to each communication protocol layer; and (c) transmitting, from the first terminal to the second terminal, the header separately from the bit stream transmitted in the operation (b), wherein in the operation (c), a bit stream, to which header information has been added by undergoing each communication protocol layer, is transmitted in an unacknowledged mode protocol, and only the header information in the bit stream is separately transmitted in an acknowledged mode protocol; and wherein, when a number of times of re-transmission of a bit stream transmitted in an acknowledged mode protocol is equal to or less than a predetermined number of times, the bit stream, which has been transmitted in an unacknowledged mode protocol, is transmitted in an acknowledged mode protocol.