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.
|Translated title of the contribution||Architecture of achieving QoS for multiple flows per node in WLANs|
|Title of host publication||IEEE International Workshop on Quality of Service (IWQoS), Enschede, Netherlands|
|Publisher||Institute of Electrical and Electronics Engineers (IEEE)|
|Pages||191 - 198|
|Number of pages||8|
|Publication status||Published - Jun 2008|
|Event||16th International Workshop on Quality of Service - Enschede, Netherlands|
Duration: 1 Jun 2008 → …
|Conference||16th International Workshop on Quality of Service|
|Period||1/06/08 → …|
Bibliographical noteRose 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 www.3cresearch.co.uk.
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.
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