Overload control in SIP servers: Evaluation and improvement

Maryam Homayouni, M. Jahanbakhsh, S. V. Azhari, A. Akbari
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引用次数: 16

Abstract

The Session Initiation Protocol (SIP) has gained momentum and is being widely used both in the Internet and Next Generation Telecommunications network as the core signaling protocol. SIP operation relies on SIP servers which are responsible for forwarding of SIP messages. It has been shown that the performance of SIP servers is largely degraded during overload conditions due to the built in message retransmission mechanism of SIP. This is an obstacle in wide deployment of SIP for a realistic situation. In this paper we propose a distributed and adaptive window based overload control algorithm, which controls the amount of calls that are forwarded to a downstream SIP server in an attempt to prevent it from being overloaded. Our scheme uses the call establishment delay as a measure of the amount of load on the downstream server and unlike other methods does not rely on explicit feedback. Using simulations we show that our proposed method performs better than a commonly used overload control algorithm and exhibits fast convergence and is stable.
SIP服务器中的过载控制:评价与改进
会话发起协议(SIP)作为核心信令协议在互联网和下一代电信网中得到了广泛的应用。SIP操作依赖于SIP服务器,SIP服务器负责SIP消息的转发。研究表明,由于SIP内置的消息重传机制,在过载条件下,SIP服务器的性能会大大降低。这是在实际情况下SIP广泛部署的一个障碍。在本文中,我们提出了一种基于分布式和自适应窗口的过载控制算法,该算法控制转发到下游SIP服务器的呼叫数量,以防止其过载。我们的方案使用呼叫建立延迟作为下游服务器上负载量的度量,并且与其他方法不同,它不依赖于显式反馈。仿真结果表明,该方法优于常用的过载控制算法,收敛速度快,稳定性好。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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