Quality of service enabled cross-layer multicast framework for mobile ad hoc networks
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Date
2008
Authors
Mohammed Saghir, Mohammed
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Abstract
Mobile ad hoc networks (MANETs) are wireless networks that can freely and dynamically be created, organized and administered into arbitrary and temporary network topologies. Users of mobile ad hoc networks who wish to use multimedia applications for group communication such as video conferencing, live movie streaming and voice conversation require efficient QoS multicast strategies. In addition to the need for enabling QoS for multicast applications, there are several difficulties and challenges that need to be addressed in order to support these applications in mobile ad hoc networks, thus requiring the design of a framework to support QoS multicast applications.
In this study, a new framework (FQM) is proposed to support QoS multicast applications. The first component of the framework is the QoS multicast routing protocol designed to construct paths for the multicast group with the required bandwidth. Second, a distributed admission control based on a passive listening method to estimate bandwidth is used to prevent intermediate nodes from being overloaded, to reduce the control overhead and to provide load balancing. Third, a source based admission control with no extra control overhead is used to prevent new source from affecting ongoing sources in the multicast group. Fourth, a cross-layer architecture is proposed to support the interaction between the framework’s components and help the controllers to make accurate decisions.
The performance of the proposed approach is studied using the GloMoSim simulator and compared with an existing approach for QoS multicast applications (QAMNet). It was found that performing admission control at intermediate nodes was
more effective than performing it at destination nodes as this reduced the control overhead, conserved bandwidth and provided load balancing by preventing request packets from traveling through paths which did not have the required bandwidth. The study found that, the cross-layer architecture better supported interactions between the framework’s components and helped QoS controllers to make accurate decisions. As a result, the packet delivery ratio, group reliability and throughput were improved while average latency and jitter were reduced.
The simulation results showed that, the average RT-GPDR in FQM was higher than that in QAMNet by 13% while the average RT-GR for FQM was higher than that in QAMNet by 23.7%. In addition, the average RT-GOWL for FQM was lower than that in QAMNet by 23.8 ms while the average RT-G-Jitter for FQM was lower than that in QAMNet by 47.9 ms. In fact, FQM out-performed QAMNet in most scenarios and for all metrics studied. This came about as a result of overload prevention, the provisioning for load balancing and mitigation of the effect of best-effort traffic on real-time traffic.
Description
PhD
Keywords
Computer Science , cross-layer multicast framework , mobile ad hoc , networks