Queuing Model for SIP Server Hysteretic Overload Control with Bursty Traffic
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In this paper, we develop a mathematical model of a load control mechanism for SIP server signaling networks based on a hysteretic technique. We investigate loss-based overload control, as proposed in recent IETF documents. The queuing model takes into account three types of system state – normal load, overload, and discard. The hysteretic control is made possible by introducing two thresholds, L and H, in the buffer of total size R. We denote the mathematical model using the modified Kendall notation as an \(MMPP|M|1|\left\langle L,H\right\rangle |R\) queue with hysteretic load control and bursty input flow. Algorithms for computation the key performance parameters of the system were obtained. 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.
KeywordsSIP server hop-by-hop overload control loss-based overload control hysteretic control return time queuing model MMPP flow
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