Thorough Analysis of IEEE 802.11 EDCA in Ring Topology Scenarios with Hidden and Exposed Nodes

Authors:
Katarzyna Kosek;Marek Natkaniec;Luca Vollero
Affiliations:
Department of Telecommunications, AGH University of Science and Technology, Krakow, Poland 30-056;Department of Telecommunications, AGH University of Science and Technology, Krakow, Poland 30-056;Consorzio Interuniversitario Nazionale per l'Informatica, University of Naples, Naples, Italy
Venue:
ICCSA '09 Proceedings of the International Conference on Computational Science and Its Applications: Part I
Year:
2009

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Abstract

In this paper the authors present a simulation study of five different ring networks with hidden and exposed nodes in which the IEEE 802.11 EDCA function is used as the MAC protocol. The presented analysis is crucial for understanding how the theoretically simple ring topology can be degraded by the presence of hidden and exposed nodes. Configurations with equal and mixed priorities are considered. Additionally, the usefulness of the four-way handshake mechanism is argued. Furthermore, the achieved results are compared with the results obtained for several star and line topology networks. Finally, the authors signalize the need for a better MAC protocol.