Patent ID: 7493399

Claim:
A data transfer system comprising: a user terminal to be connected to radio base stations; a plurality of user data plane controllers connected to the radio base stations; a control plane controller connected to the user data plane controllers via a network; and a core network connected to the user data plane controllers via the network, each user data plane controller including a condition reporter for monitoring at least one of network traffic conditions, resource using conditions within itself and trouble conditions at a certain time and sending monitored condition information to the control plane controller, the control plane controller including: a condition information receiver for receiving the condition information from the condition reporter of the user data plane controller; a user data plane link selector for selecting an optimum user plane link for providing the user terminal with services on the basis of the condition information received by the condition information receiver; and a user data plane link exchange commander for requesting the core network to carry out a user data plane link exchange via an optimum user data plane controller, the core network including a user data plane link exchanger for carrying out the user data plane link exchange.