Novel Method of Improving Quality of Service for Voice over Internet Protocol Traffic in Mobile Ad Hoc Networks

Abstract

The application of mobile ad hoc network (MANET) with voice over Internet protocol (VoIP) has been increasing recently. However, given the lack of infrastructure, the quality of service (QoS) for VoIP traffic in MANET is reduced when a large number of calls are handled. In this type of dynamic environment, the development of a new infrastructure becomes increasingly costly and time consuming. In this paper, we propose an efficient method called QoS-nearest neighbor (QoS-NN), which improves the QoS level for VoIP in order to manage huge numbers of calls over MANET networks. We utilized the ad hoc on-demand distance vector (AODV) protocol as the underlying routing protocol to implement our proposed method. We then evaluated the proposed QoS-NN method using Network Simulator version 2 (NS2). The performance of the proposed QoS-NN method was compared with that of the lexicographic order method. The comparison was evaluated in terms of R-factor, end-to-end delay, packet loss ratio, and packet delivery ratio performance metrics. In addition, the proposed method was evaluated in terms of different network parameters, namely, VoIP CODECs, node mobility speed, number of calls, and number of nodes. The comparison results indicated that the proposed QoS-NN outperformed the lexicographic order method.