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Title: Quantifying multi-user diversity in ad hoc networks
Author: Royds, P. L.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 2006
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The purpose of this thesis is to expound and extend the most recently evolved area of ad hoc networks: multi-user diversity. These networks make use of the mobility of nodes in order to forward packets: the original proposal is that the source broadcasts a packet to as many other nodes as possible as they come within sufficiently close range, and these intermediate relay nodes likewise buffer the packet until they come within close range of the destination, at which point the destination receives the packet. The effect of this method is that the network is scalable in terms of the number of mobile nodes, whereas conventional ad hoc networks are not. Since the work completed to-date on this topic is highly theoretical, this thesis aims to study diversity in ad hoc networks in a more realistic setting. The thesis researches for the first time the effects which different network parameters have on packet delay and dropping probability, such as node communication range, node density, node buffer size and different packet generation rates. A further routing method is also suggested and likewise fully analysed. With this new method, relay nodes forward packets amongst each other, thereby speeding the process of packet dissemination, and decreasing delay. The novel use of immobile nodes to improve packet delivery is also explored. Original and standard mathematical models as well as custom-built computer simulations are used in the analysis of these network parameters. Key to a deeper understanding of these networks is an appreciation for how long mobile nodes might remain in contact with each other. This is explored for the first time in Chapter 7 and can lead to further work in terms of developing a suitable protocol stack for diverse ad hoc networks. The thesis concludes with a description of future possibilities for research.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available