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Micromobility protocols such as Cellular IP, Hawaii and Hierarchical Mobile IP are developed to solve problems of high handoff
latency and control overhead, which occur when Mobile IP is used in combination with frequent handoffs. Up to now, tree access
network topologies are considered to evaluate the protocol performance. However, for reasons of robustness against link failures
and load balancing, extra uplinks and mesh links in the topology are desired. This article makes a classification of several
topology types and gives a model that points out to which extent the topology influences the protocol performance in terms
of handoff latency and handoff packet loss. Simulations confirm the results calculated by the model. Performance metrics such
as load balancing, end-to-end delay and robustness against link failures are also evaluated. The study points to several shortcomings
of the existing micromobility protocols for different topology types. Several aspects of the studied handoff schemes, their
advantages and drawbacks are identified.
L. Peters is a Research Assistant of the Fund for Scientific Research – Flanders (F.W.O.-V., Belgium)
Liesbeth Peters was born in Temse, Belgium, in 1978. She received her Master of Science degree in Electrotechnical Engineering from Ghent
University, Gent, Belgium in 2001. Since August 2001, she has been working as a doctoral researcher with the Department of
Information Technology (INTEC) of the Faculty of Applied Sciences, Ghent University, where she joined the Broadband Communications
Networks Group. Since October 2002, she works there as a research assistant of the Fund for Scientific Research—Flanders (F.W.O.-V.,
Belgium). Her current research interests are in broadband wireless communication and the support of IP mobility in wired cum
wireless networks.
Ingrid Moerman was born in Gent, Belgium, in 1965. She received the degree in Electro-technical Engineering and the Ph.D degree from the
Ghent University, Gent, Belgium in 1987 and 1992, respectively. Since 1987, she has been with the Interuniversity Micro-Electronics
Centre (IMEC) at the Department of Information Technology (INTEC) of the Ghent University, where she conducted research in
the field of optoelectronics. In 1997, she became a permanent member of the Research Staff at IMEC. Since 2000 she is part-time
professor at the Ghent University. Since 2001 she has switched her research domain to broadband communication networks. She
is currently involved in the research and education on broadband mobile & wireless communication networks and on multimedia
over IP. Her main research interests related to mobile & wireless communication networks are: adaptive QoS routing in wireless
ad hoc networks, personal networks, body area networks, wireless access to vehicles (high bandwidth & driving speed), protocol
boosting on wireless links, design of fixed access/metro part, traffic engineering and QoS support in the wireless access
network. Ingrid Moerman is author or co-author of more than 300 publications in the field of optoelectronics and communication
networks.
Bart Dhoedt received a degree in Engineering from the Ghent University in 1990. In September 1990, he joined the Department of Information
Technology of the Faculty of Applied Sciences, University of Ghent. His research, addressing the use of micro-optics to realize
parallel free space optical interconnects, resulted in a PhD degree in 1995. After a 2 year post-doc in opto-electronics,
he became professor at the Faculty of Applied Sciences, Department of Information Technology. Since then, he is responsible
for several courses on algorithms, programming and software development. His research interests are software engineering and
mobile & wireless communications. Bart Dhoedt is author or co-author of more than 100 papers published in international journals
or in the proceedings of international conferences. His current research addresses software technologies for communication
networks, peer-to-peer networks, mobile networks and active networks.
Piet Demeester finished his PhD thesis at the Department of Information Technology (INTEC) at the Ghent University in 1988. At the same
department he became group leader of the activities on Metal Organic Vapour Phase Epitaxial growth for optoelectronic components.
In 1992 he started a new research group on Broadband Communication Networks. The research in this field resulted in already
more than 300 publications. In this research domain he was and is a member of several programme committees of international
conferences, such as: ICCCN, the International Conference on Telecommunication Systems, OFC, ICC, and ECOC. He was Chairman
of DRCN’98. In 2001 he was chairman of the Technical Programme Committee ECOC’01. He was Guest Editor of three special issues
of the IEEE Communications Magazine. He is also a member of the Editorial Board of the Journals “Optical Networks Magazine”
and “Photonic Network Communications”. He was a member of several national and international PhD thesis commissions. Piet
Demeester is a member of IEEE (Senior Member), ACM and KVIV. His current research interests include: multilayer networks,
Quality of Service (QoS) in IP-networks, mobile networks, access networks, grid computing, distributed software, network and
service management and applications (supported by FWO-Vlaanderen, the BOF of the Ghent University, the IWT and the European
Commission). Piet Demeester is currently full-time professor at the Ghent University, where he is teaching courses in Communication
Networks. He has also been teaching in different international courses. 相似文献
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A nonlinear dynamic model for the quotes issued by Nasdaq dealers is considered. The model focusses on the top two electronic communication networks (ECNs), Island and Instinet, and the three most active market makers for a sample of twenty stocks. The model extends the standard linear vector error correction model for price discovery in three different ways. First, quote adjustments are set relative to the inside quote, i.e. the best bid and ask in the market. Second, dealers react to the inside spread. Third, adjustments differ according to which dealer is currently at the inside. Adjustments are different if an ECN is currently at the inside compared to an individual dealer. This difference is attributed to the asymmetric information among dealers. Price discovery dynamics are studied using generalized impulse response functions. 相似文献
157.
Peter Grabienski 《电子设计技术》2004,11(1):76
VoIP必定会给电话系统带来革命性的变化,这种技术通过电话实现了话音和数据互联的融合,从而不再需要单独的数据和话音电缆系统,它还提高了网络效率并降低了每次呼叫的成本. 相似文献
158.
Experimental results on the growth and velocity of droplets (up to 0.45 mm/s) during the temperature‐induced phase separation of the 3‐methoxypropionitrile/water solvent system as well as a variety of theoretical methods used to study the demixing dynamics are presented. Due to computational costs, the simulation with Molecular Dynamics (MD) is feasible only for very short times (ps) and miniscule boxes (Å). Dissipative Particle Dynamics (DPD), where a coarse‐grained model of the system is employed, allows nanosecond simulations in a box with more than 13 million atoms in a diffusion‐dominated regime. Finally, the influence of the diffusion/convection ratio during the separation in the μs scale is studied by use of a code based on Model H for both instantaneous and non‐instantaneous quenching cases. Structural information and macroscopic parameters, such as interfacial tension, can be derived from the molecular simulations. 相似文献
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