Handoff management in the mobile wireless Internet
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Date
2006
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
University of Zululand
Abstract
The large number ofnodes in wireless networks and the fact that mobility is an important
feature of a wireless system has made it a great challenge to sustain ongoing connections
during handoff events. Real-time applications (e.g., Voice-Over-IP (VoIP), Video-Ondemand,
and streaming) require little or no service disruptions during handoff because of
their nature of being mostly delay-sensitive applications. The network must, therefore,
offer minimal handoff delays, minimal latency, low call dropping probability; and should
also fully be supportive ofspeed variations in mobile nodes during network layer handoff.
In our research we developed and simulated a fast network layer (subnet-to-subnet)
handoff management scheme, known as Sector Aware handoff(SAH) strategy. SAH uses
cell sectors marked into regions. The sectors have non-handoff region, preparation region
and handoff execution region. The SAH scheme uses mobile node's real-time mobility
parameters over cell sector regions, to provide accurate and early predictions of Network
Layer (L3) handovers - thus initiating L3 handoff preparation appropriately early. SAH is
proposed to support primarily, real-time applications' handoff requirements and also fast
moving mobile nodes (that is, supports speed variation in mobile nodes).
As a means of evaluating the performance of the proposed scheme, a simulation was
conducted. The experimental simulation results show that SAH performs better in terms of
providing low call dropping probability and maximum system utilisation, when compared
to the Fast Hierarchical Mobile IPv6 (FHMIPv6) handoffprotocol.
Description
A dissertation submitted in fulfilment of the requirements for the degree of Master of Science in the Department of Computer Science, Faculty of Science and Agriculture at the University of Zululand, South Africa, 2006.
Keywords
Wireless Internet, Mobile computing, Wireless communication systems