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 (Tshwane University of Technology), Mjumo Mzyece (Tshwane University of Technology), Anish Kurien (Tshwane University of Technology)


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 (University of KwaZulu-Natal), Dawoud Dawoud (University of KwaZulu-Natal)


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 (Rhodes University), Richard Foss (Rhodes University)


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 (University of Cape Town), Anthony Chan (University of Cape Town), Olabisi Falowo (University of Cape Town)


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.


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