The Application Of Network Coding To Multicast Routing In Wireless Networks
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The Application of Network Coding to Multicast Routing in Wireless Networks
This thesis considers the application of network coding and opportunistic routing to improve the performance of multicast flows in wireless networks. Network coding allows routers to randomly mix packets before forwarding them. This randomness ensures that routers that hear the same transmission are unlikely to forward the same packets, which permits routers to exploit wireless opportunism with minimal coordination. By mixing packets, network coding is able to reduce the number of transmissions necessary to convey packets to multiple receivers, which can lead to a large increase in throughput for multicast traffic. We discuss the design of a multicast enabled variant of MORE, a network coding based protocol for file transfer in wireless mesh networks, and evaluate this extension, which we call MORE-M, in a 20-node indoor wireless testbed. We compare MORE-M to a wireless multicast protocol that takes an approach similar to that of wired multicast by using the ETX metric to build unicast routing trees. We also compare MORE-M to a multicast enabled variant of the ExOR routing protocol. Experiments show that MORE-M's gains increase with the number of destinations, and are 35-200% greater than that of ExOR. We then consider the problem of video streaming in a wireless local area network for applications such as video conferencing. A network coding based protocol that uses opportunistic receptions at clients is proposed. We evaluate the design in our testbed and demonstrate that the use of network coding and, in particular, the use of wireless opportunism increase the quality of the video stream.
Network Coding at Different Layers in Wireless Networks
This book focuses on how to apply network coding at different layers in wireless networks – including MAC, routing, and TCP – with special focus on cognitive radio networks. It discusses how to select parameters in network coding (e.g., coding field, number of packets involved, redundant information ration) in order to be suitable for the varying wireless environments. The author explores how to deploy network coding in MAC to improve network performance and examine joint network coding with opportunistic routing to improve the successful rate of routing. In regards to TCP and network coding, the author considers transport layer protocol working with network coding to overcome the transmission error rate, particularly with how to use the ACK feedback of TCP to enhance the efficiency of network coding. The book pertains to researchers and postgraduate students, especially whose interests are in opportunistic routing and TCP in cognitive radio networks.
Protocols and Architectures for Wireless Sensor Networks
Learn all you need to know about wireless sensor networks! Protocols and Architectures for Wireless Sensor Networks provides a thorough description of the nuts and bolts of wireless sensor networks. The authors give an overview of the state-of-the-art, putting all the individual solutions into perspective with one and other. Numerous practical examples, case studies and illustrations demonstrate the theory, techniques and results presented. The clear chapter structure, listing learning objectives, outline and summarizing key points, help guide the reader expertly through the material. Protocols and Architectures for Wireless Sensor Networks: Covers architecture and communications protocols in detail with practical implementation examples and case studies. Provides an understanding of mutual relationships and dependencies between different protocols and architectural decisions. Offers an in-depth investigation of relevant protocol mechanisms. Shows which protocols are suitable for which tasks within a wireless sensor network and in which circumstances they perform efficiently. Features an extensive website with the bibliography, PowerPoint slides, additional exercises and worked solutions. This text provides academic researchers, graduate students in computer science, computer engineering, and electrical engineering, as well as practitioners in industry and research engineers with an understanding of the specific design challenges and solutions for wireless sensor networks. Check out www.wiley.com/go/wsn for accompanying course material! "I am deeply impressed by the book of Karl & Willig. It is by far the most complete source for wireless sensor networks...The book covers almost all topics related to sensor networks, gives an amazing number of references, and, thus, is the perfect source for students, teachers, and researchers. Throughout the book the reader will find high quality text, figures, formulas, comparisons etc. - all you need for a sound basis to start sensor network research." Prof. Jochen Schiller, Institute of Computer Science, Freie Universität Berlin