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Worst-case response time of aperiodc message in WorldFIP and its improvement in realtime capability

Zhi Wang Ye-Qiong Song 1 Hai-Bin Yu 2 Youxian Sun
1 TRIO - Real time and interoperability
INRIA Lorraine, LORIA - Laboratoire Lorrain de Recherche en Informatique et ses Applications
Abstract : How to support real-time traffic of aperiodic messages using WorldFIP is investigated in this paper. Transmission of aperiodic message within WorldFIP is a very complicated procedure because it is concerned with left time in a microcycle and must successively experience three different stages, indicating, identifying, and transmitting aperiodic message. This paper presents an integrated approach to analyze the worst-case responding time (WCRT) of aperiodic message, through integrating transmission of periodic message and these stages of aperiodic message together. To decrease pessimistic factors in WCRT of aperiodic message, priority of aperiodic message is considered. Detail analysis of the WCRT of aperiodic message indicates that the current scheduling method cannot effectively utilize priority to guarantee important aperiodic messages. Then improved scheduling methods, one adding priority and another adjusting the schedule table, are proposed. The improved methods are finally validated by case studies.
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Submitted on : Tuesday, September 26, 2006 - 10:14:58 AM
Last modification on : Tuesday, March 16, 2021 - 5:42:05 PM

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Zhi Wang, Ye-Qiong Song, Hai-Bin Yu, Youxian Sun. Worst-case response time of aperiodc message in WorldFIP and its improvement in realtime capability. ISA Transactions, Elsevier, 2004, 43 (4), pp.623-637. ⟨inria-00100164⟩

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