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Results confirm improved performance compared to commonly used random sector and last sector based directional MAC protocols.Further, we identify RTS/CTS collisions as our second problem which leads to appreciable throughput degradation in ad hoc networks.
First, we propose a novel cooperative ratio-based MAC scheduling scheme for finite horizon applications.
In this scheduling scheme, each node cooperatively adapts access probability in every window based on its own and neighbors‘ backlogs and channel states to enhance throughput, scalability and fairness performance.
In this section, we introduce problems that arise as a result of directional communication.
We consider two such problems and propose techniques that consequently lead to throughput, delay and scalability enhancement.
For the MANET to retain its efficiency, the ad hoc protocols at various layers may need to self-tune to adjust to environment, traffic and mission changes.
From these properties emerges the vision of the MANET as an extremely flexible, malleable and yet robust and formidable network architecture.Indeed, an architecture that can be deployed to monitor the habits of birds in their natural habitat, and which, in other circumstances, can be organized to interconnect rescue crews after a Tsunami disaster, or yet can be structured to launch deadly attacks onto unsuspecting enemies. Xiang-Yang Li, Department of Computer Science, Illinois Institute of Technology.A Mobile “Ad hoc” wireless NETwork (MANET) is a network established for a special, often extemporaneous service customized to applications.The ad hoc network is typically set up for a limited period of time, in an environment that may change from application to application.In this respect, we investigate and propose a fully distributed asynchronous polarization based DMAC protocol.In this protocol, each node senses its neighborhood on both linear polarization channels and adapts polarization to enhance throughput and scalability.As a difference from the Internet where the TCP/IP protocol suite supports a vast range of applications, in the MANET the protocols are tuned to a specific customer and application (eg, send a video stream across the battlefield; find out if there is a fire in the forest; establish a videoconference among several teams engaged in a rescue effort, etc).The customers move and the environment may change dynamically and unpredictably.Throughput and delay comparisons against the basic DMAC protocol clearly show throughput, scalability and delay improvements.The supplemental file or files you are about to download were provided to Pro Quest by the author as part of a dissertation or thesis.