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Finding the minimum available transmission time for the timed token medium access control protocol

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4 Author(s)
Sijing Zhang ; Centre for Commun. Syst. Res., Cambridge Univ., UK ; Stewart Lee, E. ; Burns, A. ; Yang, H.

Exactly capturing the minimum available time for a network node to transmit its synchronous messages during any given length of time is important for guaranteeing the transmission of synchronous messages before their deadlines in a timed token ring network (such as FDDI) where the timed token medium access control protocol is used. Previous results which only give a lower bound on the minimum transmission time could be too pessimistic for supporting the timely delivery of synchronous traffic in a hard real-time communication environment. This paper presents an O(n)-time algorithm for exactly determining the minimum available transmission time. The algorithm can be used to test whether or not a given allocation of synchronous bandwidths can guarantee a synchronous message set with message deadlines no more than periods; the test so formed is better than any previous testing method whose test is sufficient only, in the sense that it is both sufficient and necessary and therefore optimal

Published in:

Real-Time Systems, 1999. Proceedings of the 11th Euromicro Conference on

Date of Conference:

1999

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