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IEICE Transactions on Communications 2008 E91-B(2):437-445; doi:10.1093/ietcom/e91-b.2.437
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Regular Section -- Papers -- Network Management/Operation

A Study of Control Plane Stability with Retry Traffic: Comparison of Hard- and Soft-State Protocols

Masaki AIDA1, Chisa TAKANO1,2, Masayuki MURATA3 and Makoto IMASE3

1 The authors are with the Graduate School of System Design, Tokyo Metropolitan University, Hino-shi, 191-0065 Japan. E-mail: maida{at}sd.tmu.ac.jp, 2 The author is with the Traffic Engineering Division, NTT Advanced Technology Corporation (NTT-AT), Musashino-shi, 180-0006 Japan., 3 The authors are with the Graduate School of Information Science and Technology, Osaka University, Suita-shi, 565-0871 Japan.


  Abstract

Recently problems with commercial IP telephony systems have been reported one after another, in Japan. One of the important causes is congestion in the control plane. It has been recognized that with the current Internet it is important to control not only congestion caused by overload of the data plane but also congestion caused by overload of the control plane. In particular, "retry traffic," such as repeated attempts to set up a connection, tends to cause congestion. In general, users make repeated attempt to set up connections not only when the data plane is congested but also when the control plane in the network is overloaded. The latter is caused by user behavior: an increase in the waiting time for the processing of connection establishment to be completed tends to increase his or her initiation of reattempts. Thus, it is important to manage both data plane and control-plane resources effectively. In this paper, we focus on RSVP-based communication services including IP telephony, and introduce a model that takes account of both data-plane and control-plane systems, and we examine the behavior of retry traffic. In addition, we compare the system stability achieved by two different resource management methods, the hard-state method and the soft-state method.

Key Words: IP telephony, VoIP, retry traffic, control plane, soft-state, stability

Manuscript received March 22, 2007. Manuscript revised July 17, 2007.


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