High Level B-ISDN/ATM Traffic Management in Real Time

Document type: Bookchapters
Full text:
Author(s): Åke Arvidsson
Title: High Level B-ISDN/ATM Traffic Management in Real Time
Book: Performance Modelling and Evaluation of ATM Networks
Year: 1995
Volume: 1
Pagination: 177-207
Editor: Demetres Kouvatsos
ISBN: 0-412-71140-0
Publisher: Chapman & Hall
City: London
Organization: Blekinge Institute of Technology
Department: Dept. of Telecommunications and Mathematics (Institutionen för telekommunikation och matematik)
Dept. of Telecommunications and Mathematics S-371 79 Karlskrona
+46 455 780 00
Authors e-mail: ake.arvidsson@itm.hk-r.se
Language: English
Abstract: We study real time traffic management in the perspective of a four-level model of traffic
variations: cells, bursts, sessions, and links. Our interest is focused on the two latter levels:
Using virtual channels (VCs) and virtual paths (VPs) as the managed entities on the two
levels respectively, we put forward a simple and robust strategy for traffic management
in real time: All nodes simultaneously monitor offered traffics and forward the result to a
network management centre (NMC); The NMC computes a new set of optimal VPs and
compares the result to the existing network; If a change appears profitable, the necessary
information is sent back to the nodes and the new design is implemented.
Applying our strategy to control general networks subject to traffics which in advance
are known only as expectations, we develop simple methods for traffic observation, the
optimal observation interval, a fast and efficient algorithm to compute VP networks, a
test to determine whether to implement a new design in which costs related to lost traffic
are compared to processing costs, and the optimal updating interval.
Running our strategy in a simulator, we discover a considerable adaptivity, large savings
in transmission capacity, and a performance far better than achieved by fixed redesign
according to forecasts. Finally we discuss limits to the range of variations within which
our strategy can be applied.
The present work applies both to networks using SDH/SONET and/or networks based
on ATM, i.e. both to present public switched telephony networks and broadband inte-
grated services digital networks, and is a summary and extension of earlier works within
this area [3{9].
Subject: Telecommunications\VP and VC Assignment and Routing
Keywords: Network Architecture and Design; Network Operations
Note: This article is written under the Project "VP and VC Assignment and Routing"