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Identifier 000323120
Title Σύστημα παρακολούθησης και μέτρηση της απόδοσης Ασύρματου Μητροπολιτικού Δικτύου
Alternative Title Monitoring System and Performance Measurement of Wireless Metropolitan Network
Author Μαθιουδάκης, Κωνσταντίνος Ι
Thesis advisor Σύρης, Βασίλειος
Abstract Wireless multi-radio multi-channel mesh networks, such as the experimental wireless metropolitan multi-radio mesh network in Heraklion, have the potential to provide ubiquitous and ultra high-speed broadband access in urban and rural areas, to both fixed and mobile users with low operation and management costs. In this thesis we first present the implementation of a continuous and an on-demand monitoring system for wireless metropolitan links, which allow us to quickly and easily identify and help understand anomalous link behavior. Some of the observations using the monitoring systems include the asymmetry in the performance of a link in its two directions, and the variations of link quality and transmission rate throughput the day, which is different for different links. Second, in this thesis we study the interaction of wireless interfaces on the same node, in both an indoor and metropolitan environment. Our results confirm that the mesh nodes’ hardware is able to support the simultaneously running of the four wireless cards. Interference among interfaces takes place when they operate on the same channel or on neighboring channels. Moreover, interference is higher when the distance of the respective antennas is smaller. Finally, in this thesis we investigate the performance of wireless links in terms of throughput, packet loss, and http latency as function of transmission rate and transmission power, which shows that for every link in the metropolitan network there is a specific transmission rate that optimizes the link’s performance. An important conclusion is that the performance for all three metrics is higher, when the link transmission rate is fixed to an appropriate value, compared to when the autorate algorithm operates.
Physical description xviii, 72 σ. : εικ. ; 30 cm.
Language Greek
Issue date 2008-04-11
Collection   School/Department--School of Sciences and Engineering--Department of Computer Science--Post-graduate theses
  Type of Work--Post-graduate theses
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