01-747 - Efficient Micro-Mobility using Intra-domain...

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1 Efficient Micro-Mobility using Intra-domain Multicast-based Mechanisms (M&M) Ahmed Helmy Department of Electrical Engineering-Systems University of Southern California helmy@usc.edu Muhammad Jaseemuddin Nortel Networks jaseem@nortelnetworks.com Abstract One of the most important metrics in the design of IP mobility protocols is the handover performance. Handover occurs when a mobile node changes its network point-of- attachment from one access router to another. If not performed efficiently, handover delays, jitters and packet loss directly impact and disrupt applications and services. With the Internet growth and heterogeneity, it becomes crucial to design efficient handover protocols that are scalable, robust and incrementally deployable . The current Mobile IP (MIP) standard has been shown to exhibit poor handover performance. Most other work attempts to modify MIP to slightly improve its efficiency, while others propose complex techniques to replace MIP. Rather than taking these approaches, we instead propose a new architecture for providing efficient and smooth handover, while being able to co-exist and inter-operate with other technologies. Specifically, we propose an intra-domain multicast-based mobility architecture, where a visiting mobile is assigned a multicast address to use while moving within a domain. Efficient handover is achieved using standard multicast join/prune mechanisms. Two approaches are proposed and contrasted. The first introduces the concept proxy-based mobility, while the other uses algorithmic mapping to obtain the multicast address of visiting mobiles. We show that the algorithmic mapping approach has several advantages over the proxy approach, and provide mechanisms to support it. Network simulation (using NS-2) is used to evaluate our scheme and compare it to other major approaches to micro- mobility; hierarchical mobile IP and seamless handover. Results show that our scheme, although simpler, outperforms the other schemes in over 94% of the scenarios, and provides, on average, handover performance that is 1.23 to 3 times better, depending on topology and mobility. We also study multicast state aggregation and show that a simple lossy bit- wise aggregation scheme obtains aggregation gains ranging from 1.25 to 2. Our work provides extremely efficient, yet simple, schemes to achieve notable improvement in handover performance and scalability . I. INTRODUCTION The growth of mobile communications necessitates efficient support for IP mobility. IP mobility addresses the problem of changing the network point-of- attachment transparently during movement. When the mobile node moves away from its current network point-of-attachment, handover is invoked to choose another suitable point-of-attachment. In such an environment, handover latency and mobility dynamics pose a challenge for the provision of efficient handover.
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01-747 - Efficient Micro-Mobility using Intra-domain...

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