Abstract
Although the importance of the signalling performance of ATM networks has been recognized as a potential bottleneck (Gelenbe, 1997a), very few papers address the congestion situation in switches due to signalling message flow.
In this paper the overload generated by signalling message flow in ATM networks is investigated by measurements and simulation. The results obtained by measurements*** on a university campus network highlight the strong influence of call attempts arriving in a burst on setup time, and form a basis for the simulation model. We simulate the flow of call establishment messages to estimate the queue lengths of signalling messages at access and intermediate nodes, the call blocking probability of different traffic classes and the average round trip time delay (RTT) of connection establishment in two cases with or without wide-band Blocked Call Queueing (BCQ).
In B-ISDN the call blocking probability (CBP) of wide-band (WB) calls is much higher than that of narrow-band (NB) calls’. The introduction of queueing the WB calls rather than reject is going to reduce the CBP of WB calls, at the expense of a small increase in setup time and an increase in CBP of NB calls. The signalling overload associated with WB BCQ and questions related to grade of service are also investigated. The main contribution of the second part of this paper is to show, that the WB BCQ mechanism does not cause congestion of signalling message flow at the network level, when it is applied for moderate overload conditions.
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Additional reading
Onvural, R.O. and Cherukuri, R. (1997) Signaling in ATM Networks, Artech House, ISBN 0–89006–871–2
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Székely, S., Moldován, I., Simon, C. (1998). Overload generated by signalling message flows in ATM networks. In: Körner, U., Nilsson, A.A. (eds) Performance of Information and Communication Systems. IFIP — The International Federation for Information Processing. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-35355-5_5
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DOI: https://doi.org/10.1007/978-0-387-35355-5_5
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