Detection of traffic congestion based on link-level metrics in IEEE 802.11 networks

Jong Ok Kim, Peter Davis, Tetsuro Ueda, Sadao Obana

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


In this paper, we address adaptive link switching over heterogeneous wireless access networks including IEEE 802.11. When an IEEE 802.11 link is congested, the transmission link of a terminal with multi-RATs (radio access technologies) is switched to another radio access systems. To this end, we propose link-level metrics of LC (link cost) and AC (access cost) for quantifying TCP congestion over IEEE 802.11 networks. The proposed metric can be easily measured at a local wireless terminal, and that enables each multi-RAT terminal to work in a distributed way. Through various indoor and outdoor experiments using a test-bed system, we verify that the proposed link level metrics are good indicators of TCP traffic congestion. Experimental results show that the proposed metrics can detect congestion occurrence quickly, and avoid the TCP throughput degradation of other neighboring terminals, when they are used for transmission link switching.

Original languageEnglish
Pages (from-to)1043-1052
Number of pages10
JournalIEICE Transactions on Communications
Issue number4
Publication statusPublished - 2011 Apr


  • Congestion metric
  • Heterogeneous wireless network
  • IEEE 802.11
  • Link-level measurement
  • Transmission link switching

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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