Effective QoS Routing Mechanism for Multimedia Applications in MANET

Abstract

A Mobile Ad-Hoc Network (MANET) is a collection of wireless mobile nodes forming a temporary network without the aid of any established infrastructure or centralized administration. The emergence of real-time applications and the widespread use of wireless and mobile device have generated the need to provide the QoS support in wireless and mobile networking environment. To provide the QoS support in MANET, QoS routing plays an important role. In this paper, an efficient QoS routing scheme is proposed to find the most relevant path for a particular traffic. The traffic is classified into video, audio and message. The different parameter sets are used for a particular traffic class. The selective parameters for route discovery is hop count, end-to-end delay and bandwidth. Hop count and end-to-end delay are used for optimization purpose and bandwidth is used for constraint. All qualified paths excluding the primary path are maintained after the route discovery. To provide fault tolerance and to keep the continuity of data packet delivery, this proposed mechanism also uses the backup route when the current active route breaks. Our scheme is applied to the Ad-hoc On Demand Distance Vector (AODV) protocol. This work is intended to provide the required QoS satisfied routes for each type of traffic class and to reduce the unnecessary computation complexity. Network Simulator tool NS-2 (ver 2.34) is used to simulate the proposed QoS routing mechanism. The performance of our solution is compared with original AODV in terms of Packet Delivery Ratio (PDR) and routing overhead (RO) to show the effectiveness of the proposed mechanism.