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Architecture of achieving QoS for multiple flows per node in WLANs

Research output: Chapter in Book/Report/Conference proceedingConference contribution

  • W Xi
  • ATD Munro
  • MH Barton
Original languageEnglish
Title of host publicationIEEE International Workshop on Quality of Service (IWQoS), Enschede, Netherlands
Publisher or commissioning bodyInstitute of Electrical and Electronics Engineers (IEEE)
Pages191 - 198
Number of pages8
StatePublished - Jun 2008
Event16th International Workshop on Quality of Service - Enschede, Netherlands

Publication series

ISSN (Print)1548615X


Conference16th International Workshop on Quality of Service
Period1/06/08 → …


This paper proposes an effective architecture to achieve QoS in distributed WLANs when multiple traffic streams are present and flowing through every single station. The 802.11e standard specifies a multiple-state-machine (MSM) structure in the medium access control (MAC) to address this QoS concern. However, our research indicates that the MSM structure was suboptimal. It increases the collision rate and weakens the stability of the network. Instead, we propose a QoS scheduler over the MAC state machine (called local scheduler multi flow, LSMF): the proposed LSMF architecture prevents every flow in a node from initiating its own contention simultaneously, consequently, improves the overall network throughput and stability. We evaluate the performance of our LSMF model through mathematical analysis and simulations in comparison with the 802.11e MSM model, and prove the LSMF architecture is superior in both QoS effectiveness and flexibility for multiple flows per node case.

Additional information

Rose publication type: Conference contribution Sponsorship: The work reported in this paper has formed part of the OSIRIS project within the 3C Research programme of convergent technology research for digital media processing and communications, whose funding and support is gratefully acknowledged. For more information please visit The authors would like to thank Dr E.J. Collins from the Statistics Group in Department of Mathematics in the University of Bristol for his help on the mathematical modelling. Terms of use: Copyright © 2008 IEEE. Reprinted from 16th International Workshop on Quality of Service, 2008 (IWQoS 2008). This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Bristol's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to By choosing to view this document, you agree to all provisions of the copyright laws protecting it.


16th International Workshop on Quality of Service

Duration1 Jun 2008 → …

Event: Conference

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