A New Distributed Scheduling Algorithm to Guarantee QoS Parameters for 802.11e WLAN

  • Saeid Montazeri
  • Reza Berangi
  • Mahmood Fathy
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 3961)


The existing distributed QoS mechanisms for WLAN MAC layer are only able to differentiate between various traffic streams without being able to guarantee QoS. On the other hand, most of the centralized QoS mechanisms are only able to guarantee QoS parameters for CBR traffic effectively. This paper addresses these deficiencies by proposing a new distributed QoS scheme that guarantees QoS parameters such as delay and throughput for both CBR and VBR traffics. The proposed scheme can also adapt to the various conditions of the network. To achieve this, three fields are added to the RTS/CTS frames that their combination with the previously existing duration field of RTS/CTS frames, guarantees the periodic access of a station to the channel. The performance of the proposed method has been evaluated with a specific simulator. The result are compared with IEEE 802.11e HCCA mechanism, and shown that it outperforms HCCA.


Distribute Coordination Function Traffic Stream Beacon Frame Contention Period Channel Load 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Saeid Montazeri
    • 1
  • Reza Berangi
    • 1
  • Mahmood Fathy
    • 1
  1. 1.Department of Computer EngineeringIran University of Science and TechnologyTehranIran

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