Mobile computing is becoming increasingly important, due to the rise in the number of
portable computers and the desire to have continuous network connectivity to the
Internet, irrespective of the physical location of the node. We have also seen a steady
growth of the market for wireless communication devices. Such devices can only have
the effect of increasing the options for making connections to the global Internet. The
Internet infrastructure is built on top of a collection of protocols called the TCP/IP
protocol suite. Transmission Control Protocol (TCP) and Internet Protocol (IP) are the
core protocols in this suite. There are currently two standards: one to support the current
IPv4 and one for the upcoming IPv6 [1]. IP requires the location of any node connected
to the Internet to be uniquely identified by an assigned IP address. This raises one of the
most important issues in mobility because, when a node moves to another physical
location, it has to change its IP address. However, the higher-level protocols require the
IP address of a node to be fixed for identifying connections.
The Mobile Internet Protocol (Mobile IP) is an extension to the Internet Protocol
proposed by the Internet Engineering Task Force (IETF) that addresses this issue. It
enables mobile devices to stay connected to the Internet regardless of their locations,
without changing their IP addresses and, therefore, an ongoing IP session will not be
interrupted [2, 3, 4]. More precisely, Mobile IP is a standard protocol that builds on the Internet Protocol by making mobility transparent to applications and higher-level
protocols like TCP. However, before Mobile IP can be broadly deployed, there are still
several technical barriers, such as long handover periods and packet loss that have to be
overcome, in addition to other technical obstacles, including handover performance,
security issues and routing efficiency [7].
This study presents an investigation into developing new handover mechanisms based on
link layer information in Mobile IP and fast handover in Mobile IPv6 environments. The
main goal of the developed mechanisms is to improve the overall IP mobility
performance by reducing packet loss, minimizing signalling overheads and reducing the
handover processing time. These models include the development of a cross-layer
handover scheme using link layer information and Mobile Node (MN) location
information to improve the performance of the communication system by reducing
transmission delay, packet loss and registration signalling overheads.
Finally, the new schemes are developed, tested and validated through a set of
experiments to demonstrate the relative merits and capabilities of these schemes.
| Identifer | oai:union.ndltd.org:BRADFORD/oai:bradscholars.brad.ac.uk:10454/4900 |
| Date | January 2010 |
| Creators | Alnas, Mohamed J.R. |
| Contributors | Awan, Irfan U., Holton, David R.W. |
| Publisher | University of Bradford, Department of Computing |
| Source Sets | Bradford Scholars |
| Language | English |
| Detected Language | English |
| Type | Thesis, doctoral, PhD |
| Rights | <a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/3.0/"><img alt="Creative Commons License" style="border-width:0" src="http://i.creativecommons.org/l/by-nc-nd/3.0/88x31.png" /></a><br />The University of Bradford theses are licenced under a <a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/3.0/">Creative Commons Licence</a>. |
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