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Efficient global allocation of synchronous bandwidths for hard real-time communication with the timed token MAC protocol

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2 Author(s)
Sijing Zhang ; Center for Commun. Syst. Res., Cambridge Univ., UK ; E. S. Lee

This paper presents an efficient global synchronous bandwidth allocation (SBA) scheme for guaranteeing synchronous message deadlines in a timed token network (such as FDDI) where the timed token medium access control (MAC) protocol is used. A local SBA scheme allocates synchronous bandwidth to a node using only information available locally to that node while a global scheme uses network wide information from all nodes. A local SBA scheme may be preferred for practical use to a global one due to its lower network management overhead. However, a global SBA scheme can greatly outperform a local scheme due to a more appropriate allocation resulted from the more complete global information. That is, use of a global SBA scheme may largely enhance the network ability of guaranteeing synchronous traffic. The global scheme proposed in this paper outperforms all existing SBA schemes for guaranteeing synchronous messages with deadlines equal to periods. Numerical examples are given to demonstrate the superiority of the proposed scheme to previously-proposed SBA schemes

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Real-Time Computing Systems and Applications, 1999. RTCSA '99. Sixth International Conference on

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