Provisioning QoS for WiFi-enabled portable devices in home networks

Eun Chan Park, Nojun Kwak, Suk Kyu Lee, Jong Kook Kim, Hwangnam Kim

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Wi-Fi-enabled portable devices have recently been introduced into the consumer electronics market. These devices download or upload content, from or to a host machine, such as a personal computer, a laptop, a home gateway, or a media server. This paper investigates the fairness among multiple Wi-Fi-enabled portable devices in a home network when they are simultaneously communicated with the host machine. First, we present that, a simple IEEE 802.11-based home network suffers from unfairness, and the fairness is exaggerated by the wireless link errors. This unfairness is due to the asymmetric response of the TCP to data-packet loss and to acknowledgment-packet loss, and the wireless link errors that occur in the proximity of any node; the errors affect other wireless devices through the interaction at the interface queue of the home gateway. We propose a QoS-provisioning framework in order to achieve per-device fairness and service differentiation. For this purpose, we introduce the medium access price, which denotes an aggregate value of network-wide traffic load, per-device link usage, and per-device link error rate. We implemented the proposed framework in the ns-2 simulator, and carried out a simulation study to evaluate its performance with respect to fairness, service differentiation, loss and delay. The simulation results indicate that the proposed method enforces the per-device fairness, regardless of the number of devices present and regardless of the level of wireless link errors; furthermore it achieves high link utilization with only a small amount of frame losses.

Original languageEnglish
Pages (from-to)720-740
Number of pages21
JournalKSII Transactions on Internet and Information Systems
Issue number4
Publication statusPublished - 2011 Apr 29


  • Home network
  • IEEE 802.11
  • Service differentiation
  • TCP congestion control

ASJC Scopus subject areas

  • Information Systems
  • Computer Networks and Communications


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