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Journal of Information Science and Engineering, Vol. 24 No. 5, pp. 1537-1550 (September 2008)

Provisioning Erlang-B Model Based Flow Admission Control for Packet Networks

L. Senthilkumar and V. Sankaranarayanan
B.S.A. Crescent Engineering College
Vandalur, Chennai, 600 048, India

An admission control based QoS scheme for IP networks which extends the telephone networks QoS model is proposed in this paper. The basic call admission employed in telephone network is the Erlang-B model. It derives the traffic-QoS relationship through network capacity, its current utilization and future traffic demand. The same principle is been remodeled here to suit the IP network. It is used as the flow admission decision parameter for the proposed endpoint admission control strategy in a DiffServ modeled IP network. The effectiveness of the scheme over other variants such as the conventional packet drop and the inter-packer delay based endpoint admission control is also determined here. Detailed simulations shows that the proposed admission scheme results in a higher bottleneck link utilization at a reduced overhead traffic.

Keywords: admission control, probing, QoS, DiffServ, blocking probability, packet delay, Erlang

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Received August 18, 2006; revised January 15, 2007 & April 7, 2008; accepted April 24, 2008.
Communicated by Yu-Chee Tseng.