期刊名称：Journal of Theoretical and Applied Information Technology
印刷版ISSN：1992-8645
电子版ISSN：1817-3195
出版年度：2011
卷号：32
期号：1
页码：35-45
出版社：Journal of Theoretical and Applied
摘要：Wireless ad hoc network is a collection of mobile nodes interconnected by multi-hop communication paths forming a temporary network without the aid of any centralized administration or standard support services regularly available as in conventional networks. The topology of the network changes dynamically as mobile nodes join or depart the network or radio links between nodes become unusable. To accomplish this, a number of ad hoc routing protocols have been proposed and implemented, which include Destination Sequenced Distance Vector (DSDV), Dynamic Source Routing (DSR) and Ad hoc On-demand Distance Vector (AODV) routing protocols. In this paper, these protocols are evaluated by a set of parameters such as throughput, delay, packet loss, etc., and we analyze the Quality of Service (QoS) parameters from the network perspective looking into two different TCP/IP layers: transport layer and network layer. The impacts of node loads on different QoS metrics in both layers are evaluated too. As the simulation results suggest, AODV demonstrates the best performance even in the networks with moving mobile nodes. The on-demand protocols, AODV and DSR perform better than the table driven DSDV protocol. Although DSR and AODV share similar on-demand behavior, the differences in the protocol mechanisms can lead to significant performance differentials. The performance differentials are analyzed using varying network load, mobility and network size. In transport layer, because of UDP�s connectionless nature, it does not need any confirmation for receiving data, which makes UDP protocol suitable in critical time applications (real time applications) in comparison with other transport layer protocols such as TCP
