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Home    Mηχανισμοί και Αλγόριθμοι Διαφοροποίησης Ποιότητας Υπηρεσιών στο Πρωτόκολλο Ασύρματων Δικτύων ΙΕΕΕ 802.11  

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Identifier uch.csd.msc//2003kavouridou
Title Mηχανισμοί και Αλγόριθμοι Διαφοροποίησης Ποιότητας Υπηρεσιών στο Πρωτόκολλο Ασύρματων Δικτύων ΙΕΕΕ 802.11
Alternative Title Service Differentiation Μechanisms and Αlgorithms in IEEE 802.11 Wireless LAN Protocol
Creator Kavouridou, Matina
Abstract The mobile wireless LAN area is a domain of wide development and great activity over the last years. The two main WLAN standards are the ETSI High Performance European Radio (HIPERLAN) and the IEEE 802.11 WLAN; however, the latter appears to be dominating the market, with its most popular version currently at 11Mbps. The standards focus mainly on the Physical and Medium Access Control (MAC) layers. For IEEE 802.11, the MAC layer is responsible for controlling medium access, hence for sharing wireless channel resources. This is achieved by using the CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) protocol. In the first part of this work we briefly describe the CSMA/CA protocol and the parameters of the protocol that influence the provided quality of services, hence can be used for providing service differentiation. Additionally, we present the results from our investigations on how each parameter of 802.11 affects service differentiation In the second part, we propose a mechanism for dynamically assigning explicit values for one of these parameters to various stations, in order to achieve service differentiation and fairness in wireless bandwidth allocation, as well as maximizing total throughput achieved in a congested channel. The latter is often necessary in order to achieve the highest possible utilization of the scarce wireless resources. The proper functionality of our mechanism is investigated and verified through simulations.
Issue date 2003-04-01
Date available 2003-06-24
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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