Simulation of overload control in SIP server networks

In this study, we investigated a signalling load control mechanism for SIP server networks and developed a corresponding queuing model. The so-called hop-by-hop overload control, known from recent IETF drafts and RFCs, was considered and a similar buffer overload control scheme which was developed for the SS7 signalling link in ITU-T Recommendation Q.704, was proposed. The mechanism is based on hysteretic load control with thresholds for reducing potential oscillations between the control-on and control-off states under certain loading conditions. Adjustment of three types of thresholds - the overload onset threshold, the overload abatement threshold, and the overload discard threshold - makes possible the regulation of signalling traffic to meet blocking requirements. In this study, we built and analyzed the M/M/1 queue with bi-level hysteretic input load control. A numerical example illustrating the control mechanism that minimizes the return time from overloading states satisfying the throttling and mean control cycle time constraints is also presented. © ECMS Klaus G. Troitzsch, Michael Möhring, Ulf Lotzmann (Editors).

Abaev P.O. 1 , Gaidamaka Y.V. 1 , Pechinkin A.V. 2 , Razumchik R.V. 2 , Shorgin S.Ya.2
Сборник материалов конференции
  • 1 Telecommunication Systems Department, Peoples' Friendship University of Russia, Miklukho-Maklaya str., 6, 117198, Moscow, Russian Federation
  • 2 Institute of Informatics Problems of RAS, Vavilova, 44-1, 119333, Moscow, Russian Federation
Ключевые слова
Hop-by-hop overload control; Hysteretic load control; Signalling network; SIP; Threshold
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