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Schedule Reparability: Increasing Time-Triggered Network Recovery from Link Failures
Publication Type:
Conference/Workshop Paper
Venue:
24th IEEE International Conference on Embedded and Real-Time Computing Systems and Applications
Abstract
The time-triggered communication paradigm has
been shown to satisfy temporal isolation while providing end
to end delay guarantees through the synthesis of an offline
schedule. However, this paradigm has severe flexibility limitations
as any unpredicted change not anticipated by the schedule, such
as a component failure, might result in a loss of frames. A
typical solution is to use redundancy or replace and update
the schedule offline anew. With the ever increase in size of
networks and the need to reduce costs, supplementary solutions
that enhance the reliability of such networks are also desired. In
this paper, we introduce a repair algorithm capable of reacting
to unpredicted link failures. The algorithm quickly modifies the
schedule such that all frames are transmitted again within their
timing guarantees. We found that the success of our algorithm
increases significantly with the existence of empty slots spread
over the schedule, an opposite approach compared to packing
frames, commonly used in the literature. We propose a new
ILP formulation that includes a maximization of frame and
link intermissions to stretch empty slots over the schedule. Our
results show that we can repair with 90% success rate within
milliseconds to a valid schedule compared to a few minutes
needed to re-schedule the whole network.
Bibtex
@inproceedings{Pozo5174,
author = {Francisco Pozo and Guillermo Rodriguez-Navas and Hans Hansson},
title = {Schedule Reparability: Increasing Time-Triggered Network Recovery from Link Failures},
month = {September},
year = {2018},
booktitle = {24th IEEE International Conference on Embedded and Real-Time Computing Systems and Applications},
url = {http://www.es.mdu.se/publications/5174-}
}