A rate separation mechanism for performance improvements of multi-rate WLANs

  • Authors:

  • Chae-Tae Im;Dong-Hee Kwon;Young-Joo Suh

  • Affiliations:

  • Department of Computer Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Korea;Department of Computer Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Korea;Department of Computer Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Korea

  • Venue:
  • ICCSA'05 Proceedings of the 2005 international conference on Computational Science and its Applications - Volume Part I
  • Year:
  • 2005

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Abstract

The fundamental access mode of the IEEE 802.11 MAC protocol is contention based. If the traffic load is heavy or the number of contending station is large, the number of collisions is increased and it leads to the performance degradation. In this paper, we propose a mechanism that tries to reduce the number of collisions by separating and grouping the contending stations and distributing those groups over time in multi-rate WLANs. For this, we issue the trade-off relationship between the throughput fairness and temporal fairness in multi-rate WLANs. Considering the trade-off relationship, we propose a Rate Separation (RS) mechanism in which the grouping is done based on the current transmission rates of contending stations. From our simulation study, we show that the proposed mechanism reduces the number of collisions and achieves improved performance over the IEEE 802.11b WLANs.