Reliability of next-generation networks with a focus on IMS architecture

Abstract

Next-generation networks (NGNs 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.of performance [9] and reliability [10] and systems which could measure them [15]. Then, even within the new packet networks, additional evolution was necessary, for example, to design multiprotocol label switching (MPLS) IP networks. In every case, there were questions about how reliable the networks could be, given that they embodied new hardware and software which did not enjoy the longer operational, development, and deployment experiences of their predecessor "legacy" technology networks. In the early stages of new hardware development, there is always a high degree of "infant mortality" [17]. Similarly, questions regarding reliability exist today for the nextgeneration networks [1,11].

Planning energy-efficient and eco-sustainable telecommunications networks

“…The total power usage for these lines is approximately 2.7 billion kilowatt hours (kWh) per year, based on Bell Labs TPE data. With the advent of next-generation networks [3], thousands of switches as well as numerous central offices serving these lines can be consolidated. In addition to this consolidation, energy initiatives such as replacing older rectifiers with newer, more efficient ones may be deployed.…”

Performance Evaluation of IMS-Based Core Networks in Presence of Failures

“…A typical CSCF server can be seen as composed by a service logic software part and a core part [10]. The former consists of a given number of concurrent instances of the same CSCF server, each of them able to serve a certain amount of call set-up requests; the latter represents the hardware setting (power plane and supply, processors, memories, operations/maintenance blades, switch cards, etc.)…”

“…In particular, we model core network signaling servers, namely the Call Session Control Functions (CSCFs), as multi-state elements (each state corresponds to a different performance level), whose performance figures can be described by Markov models [9]. For every telecommunication system, a typical performance metrics related to the signaling server functionalities is the number of packets in the time unit forwarded by a single CSCF server to the next node [10]. Given a constant demand profile, we discuss the problem of meeting typical requirements for an IMS-based NGN in terms of signaling service availability, that is defined as the probability that the multistate system is in one of the states where performance is not less than demand (acceptable states).…”

Optimal deployment of power reserves across telecom critical infrastructures

“…One example of a next-generation network layered architecture [17] for converged networks is based on the IP Multimedia Subsystem (IMS). It can be characterized by flexible data-driven session control, standardized interfaces, standardized and flexible applications, and common subscriber data.…”