Performance analysis of IEEE 802.11 WLANs with saturated and unsaturated sources

Suong H. Nguyen, Hai L. Vu, Lachlan Andrew

Research output: Contribution to journalArticleResearchpeer-review

36 Citations (Scopus)


This paper proposes a comprehensive but tractable model of IEEE 802.11 carrying traffic from a mixture of saturated and unsaturated (Poisson) sources, with potentially different quality-of-service (QoS) parameters, i.e., TXOP limit, CWmin, and CWmax. The model is used to investigate the interaction between these two types of sources, which is particularly useful for systems seeking to achieve load-independent “fair” service differentiation.We show that, when the TXOP limit for unsaturated sources is greater than one packet, batches are distributed as a geometric random variable clipped to TXOP limit. Furthermore,we present asymptotic results for access delay distribution, which indicates that it is infeasible to obtain real-time service in the presence of eight or more saturated sources, regardless of the real-time traffic load, given that all stations use a CWmin of 32.
Original languageEnglish
Article number6062695
Pages (from-to)333 - 345
Number of pages13
JournalIEEE Transactions on Vehicular Technology
Issue number1
Publication statusPublished - Jan 2012
Externally publishedYes


  • Heterogeneous traffic
  • EEE 802.11e enhanced distributed channel access (EDCA)

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