Research On QoS Routing Protocols Of Ad Hoc Networks And NS2 Simulations

Ad Hoc networks composed of mobile nodes with wireless communication device are typically characterized by their multi-hop, temporary and un-center. With the nodes in Ad Hoc networks moving fast, the topologies of Ad Hoc networks are constantly changing.The traditional routing protocols used in Internet can not adapt to the need of Ad Hoc networks.Adaptive routing algorithms must be designed to solve the routing question in Ad Hoc networks. The researches on the routing protocols and QoS routing protocols are important research issues of Ad Hoc networks.Firstly, this thesis introduces the concept and characteristic of Ad Hoc networks.Then it introduces the two kinds of routing protocols of Ad Hoc networks including the table driven protocols and on demand protocols. We research deeply in the routing protocols such as DSDV, DSR, AODV, and TORA. With Ad Hoc networks developing fast, some applications need guarantee of the service quality. The research in the QoS support is just to solve the problem among which the QoS routing protocols are the important factors. This thesis introduces the QoS routing protocols and researches deeply in some typical QoS routing protocols. Then the network simulation and NS2 software are presented in detailThis thesis puts forward a new protocol, which can provide QoS guarantee. The protocol chooses the QoS routing path based on the end-to-end delay of the link, if there are more than one stream in the network, it will choose the best routing which has the miximum delay as the main routing,the others will be saved as the candidate routing. In all, QAODV will choose the most optimized delay restriction as the final routing and have a candidate routing mechanism in order to provide QoS guarantee.In this thesis, the author design this protocol on the NS2 platform, and compares its performance with AODV. The result shows that QAODV improve the packet delivery rate, throughput and decreases the end-to-end delay.Finally the conclusions of this thesis and suggestions for future research of the field are given. This thesis is supported by National Natural Science Foundation of China (90304018, 60672137) and the Ph. D. Programs Foundation of Ministry of Education of China (2006049710S).