Improving TSN Simulation Accuracy in OMNeT++: A Hardware-Aligned Approach

Paper

• Please see the paper for details: Improving TSN Simulation Accuracy in OMNeT++: A Hardware-Aligned Approach,
• And, please cite this paper as a reference when using our modified INET.

  @ARTICLE{10549887,
  author={Liu, How-Hang and Senk, Stefan and Ulbricht, Marian and Nazari, Hosein K. and Scheinert, Tobias and Reisslein, Martin and Nguyen, Giang T. and Fitzek, Frank H. P.},
  journal={IEEE Access}, 
  title={Improving {TSN} Simulation Accuracy in {OMNeT++}: A Hardware-Aligned Approach}, 
  year={2024},
  volume={12},
  number={},
  pages={79937-79956},
  keywords={Hardware;Protocols;Clocks;Switches;Delays;Time factors;Synchronization;Open source software;Sensitivity analysis;Frame preemption (FP);hardware testbed;measurement;OMNeT++;open-source software;simulation;time-aware shaper (TAS);time-sensitive networking (TSN);time synchronization},
  doi={10.1109/ACCESS.2024.3410109}}

version

• We used version 6.0 of OMNeT++ and version 4.5.2 of INET.

Modified in INET

• For CT test
  • src/inet/queueing/common/PacketDelayer.cc
• For gPTP test
  • src/inet/linklayer/ieee8021as/Gptp.cc
• The changes.patch file shows the difference between the original INET repo branch v4.4.x.
• Please remember to run: git submodule update --init --recursive to gain the content of the submodule.

TO configure modified INET in the .ini file

• SF mode: *.switch1*.eth[4].processingDelayLayer.egress.delay = [SET THE DELAY VALUES]
• CT mode:
  • *.switch2*.eth[1].processingDelayLayer.egress.interbuff_alpha = [ALPHA VALUE]
  • *.switch2*.eth[1].processingDelayLayer.egress.interbuff_beta = [BETA VALUE]
  • *.switch2*.eth[1].processingDelayLayer.egress.threshold_pktsize = [PKT THRESHOLD]
• gPTP New Introduced parameters.
  • *.switch1*.gptp.clockResetThreshold = 10ns
  • *.switch1*.gptp.delta = 0.7 # related to the previous oscillator compensation
  • *.switch1*.gptp.gamma = 1.0 # realted to the nr-1

HW measurement

• Please see our TSN-FlexTest

Acknowledgement

• Funded in part by the German Federal Ministry for Economic Affairs and Climate Action (BMWK) projects “TICCTEC” – grant 01MC22007A