State Analysis and Aggregation Study for Multicast-based Micro Mobility

TL;DR

This paper proposes an intra-domain multicast-based micro mobility solution that uses aggregation techniques to reduce multicast state, improving scalability and performance in mobile networks.

Contribution

It introduces a novel intra-domain multicast mobility architecture with aggregation strategies and evaluates their efficiency through extensive simulation.

Findings

Leaky aggregation outperforms perfect aggregation in gain.

Aggregation gain increases with more mobile nodes.

Fewer mobility proxies lead to higher aggregation gains.

Abstract

IP mobility addresses the problem of changing the network point-of-attachment transparently during movement. Mobile IP is the proposed standard by IETF. Several studies, however, have shown that Mobile IP has several drawbacks, such as triangle routing and poor handoff performance. Multicast-based mobility has been proposed as a promising solution to the above problems, incurring less end-to-end delays and fast smooth handoff. Nonetheless, such architecture suffers from multicast state scalability problems with the growth in number of mobile nodes. This architecture also requires ubiquitous multicast deployment and more complex security measures. To alleviate these problems, we propose an intra-domain multicast-based mobility solution. A mobility proxy allocates a multicast address for each mobile that moves to its domain. The mobile uses this multicast address within a domain for micro mobility. Also, aggregation is considered to reduce the multicast state. We conduct multicast state analysis to study the efficiency of several aggregation techniques. We use extensive simulation to evaluate our protocol's performance over a variety of real and generated topologies. We take aggregation gain as metric for our evaluation. Our simulation results show that in general leaky aggregation obtains better gains than perfect aggregation. Also, we notice that aggregation gain increases with the increase in number of visiting mobile nodes and with the decrease in number of mobility proxies within a domain.