Path re-routing algorithms for mobile IP service at the ATM-based MPLS network

Abstract

This thesis presents the hierarchical MPLS-based Mobile IP architecture to allow frequent and seamless location management and Label Switched Path setup operations while maintaining ongoing sessions and maximizing data throughput. If we employ the conventional integration scheme of MPLS and Mobile-IP, whenever MN migrates to adjacent subnet, not only should the MN register at the HA through the new FA, but also should set LSP up one more time from the HA to the FA using a Label Distribution Protocol. Therefore the handover latency is increased, and the signaling traffic also becomes heavy. In our research, when a mobile node migrates to the adjacent subnet, it performs regional registration and partial LSP re-establishment method. In the partial LSP re-establishment method, a LSP between anchor FA and new FA is established newly and existing LSP between HA and FA remains. So it should reduce LSP setup latency than conventional Integration of Mobile IP and MPLS. We also propose Dynamic re-routing scheme and Multicast re-routing scheme to support smooth handover on the hierarchical MPLS-based Mobile IP after analyzing serveral LSP re-routing scheme, which should support higher scalibility and lower handover delay than existing integration of Mobile IP and MPLS scheme.