Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/3610
Título: Adding local priority-based dispatching mechanisms to P-NET networks: a fixed priority approach
Autor: Tovar, Eduardo
Vasques, Francisco
Burns, Alan
Data: 1999
Editora: IEEE
Relatório da Série N.º: Real-Time Systems;
Resumo: In this paper we address the real-time capabilities of P-NET, which is a multi-master fieldbus standard based on a virtual token passing scheme. We show how P-NET’s medium access control (MAC) protocol is able to guarantee a bounded access time to message requests. We then propose a model for implementing fixed prioritybased dispatching mechanisms at each master’s application level. In this way, we diminish the impact of the first-come-first-served (FCFS) policy that P-NET uses at the data link layer. The proposed model rises several issues well known within the real-time systems community: message release jitter; pre-run-time schedulability analysis in non pre-emptive contexts; non-independence of tasks at the application level. We identify these issues in the proposed model and show how results available for priority-based task dispatching can be adapted to encompass priority-based message dispatching in P-NET networks.
Peer review: yes
URI: http://hdl.handle.net/10400.22/3610
ISBN: 0-7695-0240-7
ISSN: 1068-3070
Versão do Editor: http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=777464&abstractAccess=no&userType=inst
Aparece nas colecções:ISEP – CISTER – Comunicações em eventos científicos

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