Improving Mobile IP handover performance

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Contents
List of papers 1 Introduction 2 Motivation
2.1 End-users . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.2 Wireless Access Providers . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.3 Internet Service Providers . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.1 Handover Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 3.2 End-to-end Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
This licentiate thesis is based on the following papers, which will be referred to by their letters: A Jon-Olov Vatn and Gerald Q. Maguire Jr. The e ect of using co-located care-of addresses on macro handover latency
Improving Mobile IP handover performance
Jon-Olov Vatn Laboratory of Telecommunication Systems Department of Teleinformatics Royal Institute of Technology Electrum 204, 164 40 Kista, Sweden
The Internet is evolving from being a best e ort datagram network to a network providing a di erentiated service model able to support various types of applications. If this can be accomplished, the Internet is likely to become the main infrastructure, not only for asynchronous communication, such as electronic mail exchange and web browsing, but also for applications including interactive audio and video streams. We can already see steps in this direction, as some operators start to provide an IP telephony service as an alternative to the traditional telephone service provided in the public switched telephone networks. In a further step, the Internet may also become the main infrastructure for mobile personal communication. Wireless access will not only be provided through the wide area cellular phone systems, but also via wireless LAN systems as companies, organizations and private persons add wireless access points to their existing (and evolving) computer networks. In an environment with IP based mobility support, users will have more exibility to attach to di erent wireless access networks, possibly with di erent link technologies and managed by di erent operators. This licentiate thesis concerns fast handover support in IP based mobile communication. Some of the basic mechanisms involved in supporting handover across IP subnets have been investigated, with the aim of evaluating the ability of the existing protocols to provide low latency handover. The focus have been on fast retrieval of necessary IP parameters when a user attaches to a new IP subnet, and support for fast redirection of the downstream and upstream data ow. The introductory part of the thesis describes the research topic, aim and motivation for the licentiate thesis project, and summarizes the original research work. The main results are presented in three publications, which are reproduced in the thesis.
Abstract
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Acknowledgments
First, I will give my greatest thanks to my family. Thank you, my beloved wife Katarina and my son Daniel for your support and patience. My son Niklas, happily enough you only had to experience the nal completion of this work. Many thanks to my main advisor Professor Bjorn Pehrson for giving me the opportunity and supporting me in this work. He has created an extraordinary creative environment and he has been a source of inspiration during my studies. A special thanks to my second advisor Professor Gerald Q. Maguire Jr. for always being there for me. I would not have been able to nish this work without him. I also wish to thank Doctor Fredrik Orava for everything that he has helped me with. His advices and support have been most valuable. I would like to thank my colleagues Jiang Wu and Alberto Escudero Pascual for interesting discussions and useful feedback, and Claes Thornberg for helping me out at A times when I and LTEX did not get along (especially at times close to submission deadline). Finally, great thanks to everyone else at the department that have helped me in various ways. This work has been nancially supported in part by Telia AB, the Graduate School of Teleinformatics and the Royal Institute of Technology, which are gratefully acknowledged.
1999 IEEE International Workshop on Mobile Multimedia Communications (MoMuC'99), 15-17 November 1999, San Diego, CA USA.
Technical Report TRITA-IT R 00:01, ISSN-1103-534X, ISRN KTH/IT/R{ 00/01{SE, 2000, Royal Institute of Technology, Sweden, To appear in the Proceedings of IFIP Conference on Personal Wireless Communication (PWC'2000), September 14-15, 2000, Gdansk, Poland.