QoS-aware dynamic source routing using diffserv principles

Abstract

QoS in Mobile Ad hoc Networks (MANETs) pushes the envelope of performance of wireless nodes since it has to overcome the constraints of bandwidth, battery power, interference, variable channel conditions and dynamic topology of the network. Although many schemes have been proposed for achieving QoS in MANETs, shortcomings of scalability and throughput remain. In this paper, we propose a cross-layer solution that is elastic in allocation of bandwidth to QoS levels. The proposed approach is scalable in terms of the number of meters, policers and queues maintained. Extensive simulations of the proposed scheme showed superiority as compared with ASAP[3] and SWAN[4] using ns-2.29 simulator[10]. From these simulations it was found that the throughput, as measured against the committed rate and packet delivery ratio achieved for each QoS level by our scheme are better than the other two schemes, especially for high priority flows. Our approach has a higher call acceptance rate compared to ASAP. The results also show a bounded latency in initiating data plane operations. © 2009 Springer Berlin Heidelberg.