Using traffic phase shifting to improve AFDX link utilization

Renato Mancuso, Andrew V. Louis, Marco Caccamo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The Avionic Full-Duplex Switched Ethernet (AFDX) is a data network certified for avionic operations. AFDX closely follows the IEEE 802.3 (Ethernet) standard for packet forwarding. On top of that, bandwidth enforcement using traffic shaping is performed to provide deterministic delivery guarantees. The design of an AFDX network, however, imposes that bandwidth enforcement is performed at a coarse granularity. This, together with the tight requirements on transmission jitter, determines a low utilization of the physical links. In this work, we propose traffic phase shifting (TPS) as a way to increase the granularity of bandwidth assignment to nodes of an AFDX network using logic time synchronization among traffic sources. Specifically, we leverage the periodic nature of real-time traffic and use phase-shifing to prevent link congestion. This in turns allows a more fine-grained bandwidth control via the AFDX protocol. We show that TPS leads to significant improvements in terms of per-link utilization without violating predictability.

Original languageEnglish (US)
Title of host publication2015 Proceedings of the International Conference on Embedded Software, EMSOFT 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages256-265
Number of pages10
ISBN (Electronic)9781467380799
DOIs
StatePublished - Nov 4 2015
Event13th International Conference on Embedded Software, EMSOFT 2015 - Amsterdam, Netherlands
Duration: Oct 4 2015Oct 9 2015

Publication series

Name2015 Proceedings of the International Conference on Embedded Software, EMSOFT 2015

Other

Other13th International Conference on Embedded Software, EMSOFT 2015
CountryNetherlands
CityAmsterdam
Period10/4/1510/9/15

Keywords

  • Aerospace electronics
  • Aggregates
  • Bandwidth
  • Jitter
  • Mathematical model
  • Noise measurement
  • Standards

ASJC Scopus subject areas

  • Software

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