A communication system is composed of a quality determining unit, a gateway, and a user fee determining unit. The quality determining unit determines a QoS (quality of service). The gateway transfers an IP datagram at said QoS. The user fee determining unit determines a user fee for said IP datagram...http://www.google.com/patents/US20020031094?utm_source=gb-gplus-sharePatent US20020031094 - Communication system and method for determining user fee on the basis of quality of service
