Multiplex communications – Wide area network – Packet switching
Patent
1992-09-22
1995-04-04
Bowler, Alyssa H.
Multiplex communications
Wide area network
Packet switching
370 854, 370 8512, 370 8515, 34082505, 395800, 3642222, 3642293, 3642418, 364DIG1, G06F 1500
Patent
active
054044243
ABSTRACT:
A method for real time message transmission in a token ring network is provided. The method initializes each node in the network, including setting a maximum message transmission time H.sub.i such that ##EQU1## is the transmission time of a message in a message stream, P.sub.i is the period length of the message stream, TTRT is the target token rotation time, and .tau. is the portion of TTRT that is unavailable to transmit messages. The messages are then transmitted when a token arrives at a node for the duration of H.sub.i. Using this method with the timed token protocol, the synchronous messages are guaranteed to be transmitted before their deadlines if the utilization of synchronous messages is no more than 33% of available utilization.
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"Guaranteeing Synchronous Message Deadlines with the Timed Token Protocol" by Gopal Agrawal, Biao Chen, Wei Zhao and Sadegh Davari, IEEE International Conference on Distributed Computing Systems, dated Jun. 1992.
"Asymmetric Prioritized Token Ring"; IEEE Pacific Rim Conference on Communications Computer & Signal Processing, Jun. 1989; by B. Grela-M'Poko, Mehmet Ali and J. F. Hayes.
"Some Properties of timed token medium access protocols"; IEEE Transaction, Aug. 1990, by Adriano Valenzano et al.
Agrawal Gopal
Chen Biao
Davari Sadegh
Zhao Wei
An Meng-Ai T.
Bowler Alyssa H.
The Texas A&M University System
University of Houston-Clear Lake
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