Achieving per-flow and weighted fairness for uplink and downlink in IEEE 802.11 WLANs

Chiapin Wang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


In this article, we investigate a fairness issue between uplink and downlink flows in IEEE 802.11 Wireless Local Area Networks (WLANs). We propose a cross-layer adaptive algorithm which dynamically adjusts the minimum contention window size of access point according to the amount of downlink users and channel conditions to achieve per-flow fairness. In case that uplink and downlink transmissions are with different bandwidth demands for various applications, our algorithm can efficiently find the optimal minimum contention window size which provides weighted fairness based on their resource requirements. The simulation results demonstrate that our scheme can effectively provide both per-flow fairness and weighted fairness in a varying WLAN environment.

Original languageEnglish
Article number239
JournalEurasip Journal on Wireless Communications and Networking
Publication statusPublished - 2012


  • Bandwidth allocation
  • Fairness
  • IEEE 802.11 WLAN
  • MAC contention control

ASJC Scopus subject areas

  • Signal Processing
  • Computer Science Applications
  • Computer Networks and Communications


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