Patent ID: 7325142

Claim:
An IP network which maintains contracted communication quality at the time when a user terminal conducts communication through a core network based on a communication quality service level agreement made between an access network manager terminal for managing an access network to which said user terminal is connected and a core network manager terminal for managing said core network including an edge router and a core router, wherein said core network manager terminal includes means for notifying said access network manager terminal of password information for generating a password for the reception of service based on said communication quality service level agreement, at the time of the user terminal making said service request, said user terminal notifies said access network manager terminal of a communication period for said service request, said access network manager terminal determines whether there is a free resource during said communication period based on resource reservation conditions, said access network manager terminal includes means for i) generating a password based on said password information received from said core network manager and ii) transmitting the generated password to said user terminal when receiving from said user terminal a service request indicative of the intention of conducting communication having the contracted communication quality, and said user terminal includes means for conducting communication with said edge router by transmitting a packet to said edge router with said password contained in a packet header of said packet.