Aodv-of Qos Routing Swan Model, Ad Hoc Networks

Ad hoc networks are distributed and self-organizing. The networks are composed of wireless mobile nodes which must cooperate with others in order to dynamically establish communications. The emergence of real-time applications and the widespread use of wireless and mobile devices have generated a growing need of QoS support in wireless and mobile networking environments. Ad hoc networks are bandwidth constrained and time-varying due to radio link characteristics. The wireless topology that interconnects mobile hosts can change in unpredictable way. Therefore, QoS provisioning in mobile ad hoc networking is a difficult task. Although lots of research works have been done on supporting QoS in the Internet, they are not suitable for mobile ad hoc networks. The main task of the research is how to meet the bandwidth and delay requirements of real-time traffic in ad hoc networks which generate traffic mixes of real-time and best effort flows.Firstly, we introduce the AODV-QoS routing algorithm, the AODV routing protocol only try to find the shortest path without concerning about the QoS constrains. In AODV-QoS, the network has the privilege to generate paths according to its quality, and then an application selects a path with sufficient resources to satisfy a certain delay and bandwidth requirements. In order to guarantee QoS to real-time traffic, based on the QoS routing, we introduce SWAN, a stateless network model which uses distributed control algorithms to deliver service differentiation in mobile wireless ad hoc networks. SWAN uses feedback-based rate control mechanisms to control the best effort flows. The admission control and congestion control are strongly adaptive in their response to changes in topology and resource availability. Simulation results show that real-time traffic experiences low delay and high packet delivery ratio under various conditions.In this paper, Chapter 1 briefly introduces the basic characteristics and QoS support in ad hoc networks. Chapter 2 introduces AODV routing protocol and the QoS routing algorithm. Chapter 3 presents the architecture of SWAN. Chapter 4 discusses the method of building the simulation model. Then, Chapter 5 has a deep view of the simulation results which are helpful to network design and planning. Finally, Chapter 6 summarizes the work and proposes the improvements.