Mobile tracking system for QoS guaranteed paths, router device used for this system, mobile communications terminal, and control program for controlling router device

摘要

To always guarantee QoS for packet transfer and to achieve continuity of QoS guaranteed paths for upstream and downstream packet transfers between a mobile communications terminal and remote terminal, a transit router TR is used to detect any change of visitor location address reported via an existing QoS guaranteed path used for packet transfer and to newly set up a QoS guaranteed path according to the results of detection. Packets are transferred via existing QoS guaranteed paths until the transit router TR completes setup of a QoS guaranteed path. The mobile communications terminal and remote terminal are notified that the setup of the QoS guaranteed path is completed.