Using 802.11 MAC retransmissions for path selection in multi-homed transport layer protocols

Sheila Fallon, Paul Jacob, Yuansong Qiao, Austin Hanley, Liam Murphy

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Citations (Scopus)

Abstract

The Stream Control Transmission Protocol (SCTP) is a transport layer protocol which can support mobility through its multi-homing feature. One of the key parameters used by SCTP to manage path selection is Retransmission Time Out (RTO). We illustrate that SCTP's evaluation of underlying paths using end to end metrics, results in the calculation of excessive RTO for degraded wireless paths. This excessive RTO causes SCTP to behave in a counter intuitive manner which delays path switchover. Our investigation shows that the increased Round Trip Time (RTT) is as a result of retransmissions at the 802.11 MAC. We illustrate that when a connectionless 802.2 LLC service is utilized, 802.11 independently implements positive frame acknowledgement resulting in significantly increased RTT. We propose a cross layer path selection algorithm, which recognizes increased 802.11 MAC retransmissions as an indicator of imminent path failure. Results presented indicate that our cross layer approach has excellent performance in comparison to standard SCTP strategies.

Original languageEnglish
Title of host publicationGLOBECOM 2009 - 2009 IEEE Global Telecommunications Conference
DOIs
Publication statusPublished - 2009
Event2009 IEEE Global Telecommunications Conference, GLOBECOM 2009 - Honolulu, HI, United States
Duration: 30 Nov 20094 Dec 2009

Publication series

NameGLOBECOM - IEEE Global Telecommunications Conference

Conference

Conference2009 IEEE Global Telecommunications Conference, GLOBECOM 2009
Country/TerritoryUnited States
CityHonolulu, HI
Period30/11/094/12/09

Keywords

  • MAC retransmissions
  • Mobility
  • RTO
  • SCTP

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