An Enhanced Scheme to Support High Level Nested Network Mobility

Abstract

Recently, wireless devices have been used significantly due to the continuous and enormous services that they provide. The mobility support protocols have been designed to achieve a permanent and continuing access to the Internet while the mobile network are roaming and changing their points of attachment. One of the major challenges that arise is how to achieve seamless mobility and high network performance. However, one of the major requirements of a protocol supporting network mobility is to achieve continuous and uninterrupted communication to the mobile network during moving. Network Mobility (NEMO) (RFC3963), developed by Internet Engineering Task Force (IETF), is introduced for this purpose but it still suffers from some limitations, especially when the level of nesting increases. To overcome these drawbacks, this dissertation proposes an enhanced scheme using hierarchical structure to support high level nested network mobility. This proposed scheme aims to reduce packet transmission delay and handoff latency in high level nested network to achieve seamless mobilityand high network performance. This can be achieved by dividing a network domain under top-level mobile router into multiple sub domains. The evaluation technique followed in this dissertation is by using simulation and analytical model approach. The simulation carried on by using OPNET to measure performance metrics (based on simulation time) such as delay, throughput, traffic, and response time. In addition to simulation, analytical model approach has been used to measure performance metrics (based on nesting degree) are handoff latency and packet transmission delay. The proposed scheme enhancement is benchmarked with NEMO protocol and Route Optimization Using Tree Information Option (ROTIO) approach witch it based on IETF standards. The result obtained had shown that the proposed scheme has better performance than the benchmark.