Biao Biao Chen

US Patent:

54044243, Apr 4, 1995

Filed:

Sep 22, 1992

Appl. No.:

7/949043

Inventors:

Wei Zhao - College Station TX
Gopal Agrawal - College Station TX
Biao Chen - College Station TX
Sadegh Davari - Webster TX

Assignee:

The Texas A&M University System - College Station TX
University of Houston-Clear Lake - Houston TX

International Classification:

G06F 1500

US Classification:

370 855

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.

US Patent:

53134664, May 17, 1994

Filed:

Sep 22, 1992

Appl. No.:

7/949450

Inventors:

Wei Zhao - College Station TX
Biao Chen - College Station TX
Gopal Agrawal - College Station TX

Assignee:

The Texas A&M University System - College Station TX

International Classification:

H04J 316

US Classification:

370 854

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 for node i such that ##EQU1## where C. sub. i is the transmission time of a message in a message stream, P. sub. i is the period length of the message stream, and a is a non-negative constant between zero and one. 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 ##EQU2## of available utilization.