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Oleg Berzin
Advisor: Afshin Daryoush, Ph.D.
Abstract:
With the proliferation of IP based mobile applications the network layer mobility support is expected to play an increasingly significant role in the architectures of the service provider networks. The requirements to support user mobility range from the physical aspects of the wireless access networks to the logical aspects of the network layer control and forwarding plane operation. This proposal focuses on the higher level user and network protocol requirements and the associated analytical modeling of the network layer mobility management scheme in the context of Multi-Protocol Label Switched (MPLS) networks.
To support mobility the network control plane is required to detect changes in the node's location and distribute the new location information throughout the network thus enabling the forwarding plane to deliver traffic in an optimal manner. The network responsiveness to the mobile node movements can be generally thought of as the time elapsed between the moment the node's location in the network has changed and the moment the reception of packets in the new location has resumed.
We propose a new approach to handling mobility at the network layer in the context of Label Switched Networks. This new approach does not rely on the existing IP mobility management protocols such as Mobile IP, Cellular IP or MPLS Micro-Mobility. Instead it is based on a combination of Multi-Protocol BGP (MP-BGP) and MPLS. It is proposed to introduce new protocol elements to MP-BGP to achieve efficient Mobility Label distribution at the network control plane and the optimal packet delivery to the mobile node by the network forwarding plane using MPLS, regardless of the IP protocol addressing and the associated logical network topology. Our proposal creates a new mobility management scheme that is expected to provide efficient support for mobile-to-mobile communications as well as the mobile router based communications. In addition our approach is evolutionary in its nature and is based on the existing and well known architectural and protocol framework. The mobility management scheme based on MP-BGP at the control plane level and MPLS at the forwarding plane level represents a system in which both the control and forwarding processes are integrated to ensure the optimal traffic delivery that is not fully achieved in the existing network layer mobility management approaches. The wide use of BGP, its scalability, robustness and the ability to support major extensions make this protocol framework capable of adopting significant transformations such as the mobility management. In combination with MPLS and the expansion of MPLS not only in the private service provider networks but in the public Internet the mobility management with MP-BGP may be pursued to develop a global macro-mobility solution.
From the analytical perspective we propose a mathematical model of the new network layer mobility control plane based on the queuing network theory that enables the derivation and computation of the major system performance metrics of interest such as the expected network responsiveness as a function of the size of the network, the node movements and the processing load.
Friday, June 15th at 12 p.m.
Bossone 303
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