On the adaptation of broadcast transactions in token-passing fieldbus networks with heterogeneous transmission media

• Type: Article in International Conference Proceedings Book
• Date: 2002

Authors

alves, m (Author) Other; tovar, e (Author) Other; vasques, f (Author) FEUP

Conference proceedings International

Title: FIELDBUS SYSTEMS AND THEIR APPLICATIONOS 2001 (FET'2001)

Pages: 305-311

4th IFAC Conference on Fieldbus Systems and Their Applications (FeT 2001)

NANCY, FRANCE, NOV 15-16, 2001

Indexing

ISI Web of Knowledge - 9 Citations

Other information

Authenticus ID: P-000-R60

Abstract (EN): Broadcast networks that are characterised by having different physical layers (PhL) demand some kind of traffic adaptation between segments, in order to avoid traffic congestion in linking devices. In many LANs, this problem is solved by the actual linking devices, either behaving like gateways or "intelligent bridges" that use some kind of congestion control/avoidance mechanism. In this paper, we address the case of token-passing fieldbus networks operating in a broadcast fashion and involving message transactions over heterogeneous (wired or wireless) physical layers. For the addressed case, real-time (bounded message response times) and reliability (loss of frames not allowed) requirements demand a new solution to the traffic adaptation problem. Our approach relies on the insertion of an appropriate idle time before a station issuing a request frame. In this way, we guarantee that the linking devices' queues do not increase in a way that the timeliness properties of the overall system turn out to be unsuitable for the targeted applications. Copyright (C) 2001 IFAC.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7