Two Alternative Schemes to EY-NPMA for Medium Access in High Bitrate Wireless LANs

  • Authors:
  • G. Dimitriadis;F.-N. Pavlidou

  • Affiliations:
  • Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece E-mail: gedimitr@eng.auth.gr;Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece E-mail: niovi@eng.auth.gr

  • Venue:
  • Wireless Personal Communications: An International Journal
  • Year:
  • 2004

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Abstract

The growing penetration of WLANs in the market, as well as the widerspectrum of applications that these kinds of networks are called tosupport, demands the introduction of new methods for efficient mediumaccess. Today, the two dominating paradigms in medium access control arethose of dynamic assignment and contention based ones. EY-NPMA is acontention based scheme that exhibits very low collision rates, whilebeing quality of service aware. In this paper, we propose a solution tothe highly criticised drawback of the EY-NPMA protocol – the increasedoverhead. Towards this end, we propose and evaluate the performance of twomedium access schemes that are based on EY-NPMA and compare them to thebase protocol. The theoretical analysis of the proposed schemes shows thatthey make better utilization of the common medium. It also allows us todetermine the optimal working parameters for each one. Furthermore,extended simulation trials validate these results and confirm the goodcharacteristics of the proposed protocols.