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Real-time communication in multihop networks

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3 Author(s)
Kandhlur, D.D. ; IBM Thomas J. Watson Res. Center, Yorktown Heights, NY, USA ; Shin, K.G. ; Ferrari, D.

Communication in real-time systems has to be predictable, because unpredictable delays in the delivery of messages can adversely affect the execution of tasks dependent on these messages. We develop a scheme for providing predictable interprocess communication in real-time systems with (partially connected) point-to-point interconnection networks, which provide guarantees on the maximum delivery time for messages. This scheme is based on the concept of a real-time channel, a unidirectional connection between source and destination. A real-time channel has parameters that describe the performance requirements of the source-destination communication, e.g., from a sensor station to a control site. Once such a channel is established, the communications subsystem guarantees that these performance requirements will be met. We concentrate on methods to compute guarantees for the delivery time of messages belonging to real-time channels. We also address problems associated with allocating buffers for these messages and develop a scheme that preserves delivery time guarantees

Published in:

Parallel and Distributed Systems, IEEE Transactions on  (Volume:5 ,  Issue: 10 )

Date of Publication:

Oct 1994

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