Master of Science / Department of Computing and Information Sciences / Gurdip Singh / As the network bandwidth and delay increase, TCP becomes inefficient. Data intensive applications over high-speed networks need new transport protocol to support them. This project describes a general purpose high performance data transfer protocol as an application level solution. The protocol Reliable UDP-based data transfer works above UDP with reliability. Reliable Data Transfer protocol provides reliability to applications using the Sliding Window protocol (Selective Repeat). UDP uses a simple transmission model without implicit handshaking techniques for providing reliability and ordering of packets. Thus, UDP provides an unreliable service and datagrams may arrive out of order, appear duplicated, or go missing without notice. Reliable UDP uses both positive acknowledgements and negative acknowledgements to guarantee data reliability. Both simulation and implementation results have shown that Reliable UDP provides reliable data transfer. This report will describe the details of Reliable UDP protocol with simulation and implementation results and analysis.

MediaSense is an EU funded platform that is an implementation of an Internet-of-Things framework. This project adds two fundamental functions to it, namely, a new lookup service based on a peer-to-peer Distributed Hash Table (DHT) called Chord and a reliable communication protocol based on UDP (RUDP). The lookup service makes the use of a central server, that can be a single point of failure or get compromised, unnessecary. Reliable UDP transmits data from the very first packet onwards and avoids any connection management as itis packet based. The methodology for both functions was to develop a simulation environment, compatible to MediaSense, at its initiation, at which point its functionality can be tested and measurements can betaken. The resulting DHT simulation environment enables there to be deep insight into and a control of the state and action of the DHT. The resulting graphs show the performance properties of both the DHT and RUDP. In conclusion, the MediaSense platform has been extended by means of two usable functionalities and which also leaves space for further development such as for security enhancements and performance increases. / MediaSense