This white paper examines the types of overload scenarios encountered within traditional networks and concludes that similar traffic behaviour, requiring overload management, will be required within Next Generation Networks (NGNs). It looks at the principals of overload protection within real-time communications servers and the types of overload management methods that are available to optimise server performance. The paper notes that the distributed computing nature of NGN architectures such as the 3GPP IMS, has an increased detrimental impact on overload behaviour and looks at the overload management capability of the main protocols that are commonly used. It finally comments on the work in progress within ETSI TISPAN to address the issues discussed.
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