An analytical packet/flow-level modelling approach for wireless LANs with Quality-of-Service support

S.K. Cheung, J.L. van den Berg, R.J. Boucherie, R. Litjens, F. Roijers

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We present an analytical packet/flow-level modelling approach for the performance analysis of IEEE 802.11e WLAN, where we explicitly take into account QoS differentiation mechanisms based on minimum contention window size values and Arbitration InterFrame Space (AIFS) values, as included in the Enhanced Distributed Channel Access (EDCA) protocol of the 802.11e standard. We first enhance the packet-level approach previously used for best-effort WLANs to include traffic classes with different QoS requirements. The packet-level model approach yields service weights that discriminate among traffic classes. From these observations, the packet/flow-level model for 802.11e is the generalized discriminatory processor-sharing (GDPS) queueing model where the state-dependent system capacity is distributed among active traffic classes according to state-dependent priority weights. Extensive simulations show that the discriminatory processor-sharing model closely represents the flow behavior of 802.11e.
Original languageEnglish
Place of PublicationEnschede
PublisherUniversity of Twente
Number of pages12
Publication statusPublished - 2005

Publication series

NameMemorandum Faculty of Mathematical Sciences
PublisherUniversity of Twente, Department of Applied Mathematics
ISSN (Print)0169-2690


  • MSC-90B18
  • MSC-90B22
  • MSC-60K25
  • IEEE 802.11e Wireless LAN
  • EDCA
  • Quality-of-Service
  • Flow-level performance
  • File transfer times
  • Generalized Discriminatory Processor-Sharing (GDPS)


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