Sürekli akış yönlendirmesi (say): tasarsız ağlarda çoklu ortam sunularını desteklemek için yönlendirme yöntemi

ABSTRACTCONTINUOUS FLOW ROUTING (CFR): A WIRELESSAD HOC NETWORK ROUTING PROTOCOL FORSUPPORTING MULTIMEDIA FLOWSAhmet KARAM.S. in Computer Engineering˙Supervisor: Assist. Prof. Dr. Ibrahim Kürpeoğluo gJuly, 2006Multimedia flows require special routing layer support in ad hoc networksdue their unique characteristics and certain requirements on packet delay, jitter,loss rate and bandwidth. In this thesis we propose a wireless ad hoc routingprotocol (called CFR) with route discovery and maintenance mechanisms, thatis specifically designed for better supporting multimedia flows in wireless ad hocnetworks. Since multimedia flows are long durational, it is important to routethem through stable routes in order to minimize route failures and disturbanceon the flows. We propose to improve the stability by considering the energydrain rates and estimated remaining lifetimes of nodes while selecting the bestroutes. Additionally we provide a maintenance scheme that acts pro-activelyand re-routes the traffic if a node starts getting very low energy. For this wedefine two thresholds on remaining lifetime of a node. After the first threshold isreached, the node re-routes some of its flows so that the traffic load on the nodeis reduced. This helps to an even distribution of traffic to nodes of an ad hocnetwork. After the second threshold is reached, the node has very few energyand therefore redirects all its traffic to some other routes so that the flows arenot disturbed by the route failure when the node depletes all of its energy andcan not route anymore. We implemented the protocol as part of an ns2-basedsimulator and proved that it works correctly. Additionally, we compared theprotocol against some other similar protocols. The results show that CFR canindeed help supporting multimedia flows better.Keywords: Ad-Hoc Networking, Route Maintanence, Multimedia Streaming.iii