Proposal and evaluation of time critical communication protocol on LAN

Abstract

In the field of control and communication using LAN, such as plant control, there exists a requirement for the time critical property that the data transfer should be completed in the specified time (time window), in addition to the requirement for the high speed. In the timed token protocol ('lTP) that has been used in FDDI and other systems, however, the transfer time increases when the input traffic exceeds the system specification, making it impossible to maintain the time-critical property * This paper proposes an extension of TTP where only the data that can be transferred within the time window are allowed to transverse by applying dynamic distributed management to the data transmission queue In each node. To demonstrate the performance of the proposed protocol, simulations are executed under various conditions; and it is verified that the protocol is effective when applied to the time-critical communication.

Proposal and evaluation of time critical communication protocol with two‐level data queues

“…In Japan, a resource management method [ 121 that calculates and manages bandwidth at the application layer to support time critical communication, and a time critical communication protocol [13] that discards data whose time window is up have been proposed. Bandwidth control methods on datalink layer [9-111 assume that data generation is always cyclic and the transmission deadline is defined as a data generation cycle.…”