Reliability and survivability methodologies for next generation networks
Proceedings of the 6th International Conference on Advances in Mobile Computing and Multimedia
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Next-generation networks (NGNs) offer several advantages, such as support for many application-rich new services, along with more traditional telephony applications, agnostic access, and improved economics. This paper presents a new design and engineering methodology that addresses areas where traditional design for reliability approaches will not work for NGNs. It introduces the service matrix as a tool to systematically represent the call paths of the more distributed NGN network and the multiple services it supports. The concept of significant point of failure (SgPoF) enables design-for-service reliability early in the design process. The traditional approach of reliability assessment and design after the initial design and economic optimization is much less efficient given the complexity of NGN reliability. The effect of non-traditional failure sources, such as those that may be introduced by new entrant service providers or simply new operating environments (e.g., alternating current (AC) power and non-central office deployment), is considered in the design for network reliability. The paper includes examples from implementation of the methodology to IP Multimedia Systems (IMS) networks. © 2008 Alcatel-Lucent.