QUALITY ASSURANCE TYPE NETWORK SYSTEM, QUALITY ASSURANCE TYPE COMMUNICATION METHOD AND RECORDING MEDIUM RECORDING QUALITY ASSURANCE TYPE COMMUNICATION PROGRAM

摘要

PROBLEM TO BE SOLVED: To shorten an time from occurrence of a communication request in the communication required to secure a network resource for start of communication in order to warrant the communication quality. SOLUTION: When a transmission terminal desires to transmit a data flow whose communication quality is assured, the transmission terminal adds an identifier denoting it to a header of a packet of the data flow. A packet transfer device in a network references the identifier to recognize that the transmission terminal desires transmission of the data flow with quality assurance and makes preparations for it immediately. Furthermore, since information of a network resource required by the data flow is described in the header, the packet transfer device ensures the network resource immediately according to the information.