Rethinking mobile ad hoc networks

• Main Author: Huang, E.
• Published: University of Cambridge 2006
• Subjects: 621.382
• Online Access: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.604708

This thesis explores the physical layer feasibility, performance and limitations of MANETs through simulation and evaluation of a novel application scenario. The results of the work are intended to help researchers understand how and where MANETs can be used in the future, as well as to better understand physical layer considerations and methods of improving the physical layer performance of large scale, highly mobile MANETs. The thesis also investigates the effect and feasibility of using fixed relay or dispatch points that act as intermediate relays or source/sinks for messages. The results show the relative benefits of using relays vs. dispatch points, as well as the differences owing to the position, configuration and number of fixed points. We are then able to deduce the optimum configuration and type of fixed nodes to use to achieve the best results under various circumstances. Given the limited unlicensed spectrum available and the potentially high number of nodes in a bounded area, it is likely that interference will become a significant limiting factor for performance. The thesis explores this and other related issues to discover the significance of their effects and the necessary bounds for reasonable performance. We also explore the use of various techniques to mitigate these effects. The thesis concludes by investigating the issue of cooperation incentives. Without sufficient nodes cooperating to provide relaying functions, a MANET cannot function properly. Consequently various proposals have been made which provide incentives for individual users of a MANET to cooperate with each other. We examine the drawbacks of currently proposed incentive systems and propose a new solution.