SATNAC 2009 Conference Papers
Network Management & OSS
Title: An Enhanced Scheduler for the Guarantee of QoS
Multimedia Services in WiMAX Networks
Authors: Marie-Paule Gakuba (
Abstract: The rapid
deployment of broadband wireless access has led to a huge demand of multimedia
applications in networks. Efficient sharing of resources eventually becomes an
issue especially in wireless systems where various applications require
distinct QoS support. As a result an optimum utilization of the limited
resources is required. In this paper, an enhanced scheduler based on Modified
Deficit Round Robin (MDRR) scheme for QoS provisioning to prioritize
sensitive-delay applications in WiMAX networks is proposed. Variants
simulations are loaded with a number of traffics such as VoIP, FTP and Email.
To demonstrate the efficiency of the proposed scheduling, a performance
analysis of the network was conducted by means of throughput and delay. From
related work; a unique uplink (UL) scheduling algorithm appears to be
insufficient for QoS guaranteed in heterogeneous system. As a result a study of
the UL scheduler in a WiMAX base station is investigated.
Title: A Hybrid Trust Model for Mobile Ad Hoc
Authors: Richard Gordon (
Abstract: Trust establishment is a key aspect of network management. Establishing
trust in a wireless ad hoc network environment is a challenge because of its
unique characteristics. These include the lack of a central authority and the
autonomous, dynamic nature of these networks which result in poor connectivity
and routing failure. Security may be provided through conduct analysis and
certificate based techniques, such as digital certificates. We propose a hybrid
trust model for mobile ad hoc networks, combining certificate and conduct based
trust to provide secure communication. The security scheme occurs in an on-demand, fully distributive, wireless ad hoc
network environment, establishing trust on the routing layer exclusively.
Simulations show the overhead of the proposed scheme and that it has negligible
impact on network performance while providing trust establishment for the
network.
Title: A Proxy Solution for
Networked Audio Device Interoperability
Authors: Osedum Igumbor (
Abstract: This paper proposes the use of a proxy as the means to
achieving network interoperability. This research investigates whether proxies
can be used to attain cross network communication. In this paper two protocols are
described, namely the Audio Video Control (AV/C) protocol and the contemporary
AES-X170 protocol. An AV/C proxy that understands both AV/C and AESX170 is
developed and tested for connection management and device control. Presently
there exist numerous audio devices that conform to legacy protocols such as
AV/C in commercial use. The challenge is to integrate such devices into modern
professional audio networking solutions such as AES-X170. The proxy has been
developed as a high-level (application level) solution to network
interoperability. This ensures that the internal details of a device in terms
of its address mappings and low-level functionality do not restrict device
interactions. By implementing a proxy solution for network interoperability,
consumers can now take advantage of modern networking solutions by integrating
their legacy devices with devices that implement more recent control and
connection management protocols.
Title: Handover Optimization
in Heterogeneous Wireless Networks: PMIPv6 vs. PMIPv6 with MIH
Authors: Linoh Magagula (
Abstract: Next Generation wireless networks are
expected to integrate and coordinate heterogeneous communication networks to
enable network access ubiquity. Unfortunately, this integration of different
networks results in performance degradation when handovers occur among the
networks during a mobility event. Thus, there is a requirement for effective
mobility management protocols to support ubiquitous network access by providing
seamless handover. This paper examines the handover performance of Proxy Mobile
IPv6 mobility management protocol when used with and without the IEEE 802.21
Media Independent Handover services in a heterogeneous wireless networks’
environment. Our experimental analysis shows that Proxy Mobile IPv6 is an
effective mobility management protocol for next generation wireless networks in
terms of improving the handover performance metrics such as handover latency
and packet loss particularly when used with the IEEE 802.21 MIH services in
localized domain mobility scenarios.
Title: A Connectivity Model for Inter-working Multi-hop Wireless
Networks
Authors: Oladayo Salami (University
of Cape Town), Antoine Bagula (University
of Cape Town), Anthony Chan (University
of Cape Town)
Abstract: In inter-working multi-hop wireless networks, establishing resilient
connectivity between source-destination node pairs is a major issue. The issues
of connectivity in multihop wireless networks have been studied. However these
analyses focused on network connectivity in ad-hoc networks. Since the next
generation of wireless networks will be inter-working, an understanding of
connectivity as it applies to such networks is needed. Specifically, this
research emphasizes that the connectivity of node pairs in inter-working
multi-hop wireless networks can be evaluated based on the availability of radio
links and communication routes. This paper presents an analytical study of the
link and route availability in inter-working multihop wireless networks.