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For any IT transformation with significant investment, economic analysis is essential for justifying the risks and expenditures. Much cost modeling has been done for various types of IT transformations, each looks into the unique aspects of the concerned domains. This paper takes a different direction and proposes a general methodology named UROI for quickly constructing ROI/TCO models to be used...
To provide an integrated and optimized management of network modeling and simulation tools is a complex task. Indeed, the underlying information structures used by these tools are, most of the times, very distinct and it is not simple to relate them. Moreover, the re-utilization of network descriptions and other network related data among tools is not current. The use of a standard data structure,...
As multimedia services may consist of several media flows with varying importance to the users, it is beneficial to consider the relative flow importance while negotiating flow parameters. By regarding all service flows at once, a session can be described by creating the optimal session configuration and several alternative ones the resources of which are decreased with respect to user preferences...
One of the important issues for telecom carrier is that the time required to identify the root cause of a failure has increased since the number and types of alarms caused by network or service failures has increased in a fixed-mobile convergence network environment,. To address this issue, this paper proposes a root cause analysis (RCA) mechanism which classifies alarms based on their types of failures,...
One of the main challenges in the Future Internet era will be the increase of QoS-demanding applications that need to be supported. Unavoidably, this will lead to increased traffic that has to be served by the deployed networks. Moreover, the energy consumption and the configuration/management complexity will be significantly increased, too. Current network infrastructures and their associated management...
In this paper, we are proposing a four-layer enterprise architecture model for service management. The aim of the proposed architecture is to provide a framework for the automated, centralized, real-time enterprise service management solution. We developed a component model to address the functional requirements for different integrated service management functions.
With research on Wireless Sensor Networks (WSNs) becoming more and more mature in the past five years, researchers from universities all over the world have set up testbeds of wireless sensor networks, in most cases to test and evaluate the real-world behavior of developed WSN protocol mechanisms. Although these testbeds differ heavily in the employed sensor node types and the general architectural...
Networking services are increasingly being provided by peer-to-peer service overlay networks (P2P SON), allowing service providers to cooperatively offer and run a flexible set of services. In this respect, the selection of peers is a key issue for improving resource usage and end users Quality of Experience (QoE). This paper presents an approach to best peer selection in a three-tier P2P SON architecture,...
This paper presents a methodology for the automatic detection of sub-optimal performance in UMTS networks based on drive-test measurements. The proposed methodology can be seen as a first step towards the more ambitious objective of implementing Self-Organising Network (SON) concepts in future wireless networks. In fact, the lessons learnt from real UMTS case studies enable the identification of key...
We propose the managed self-organizing network concept considering the unexpected network changes caused by the future applications, and implement the control and visualization system for it. In the managed self-organizing network, multiple virtual networks are accommodated on a single optical infrastructure. Each virtual network is controlled based on self-organizing mechanism by attractor selection...
Openflow splits the control plane from the data plane and move it to a centralized remote controller that dictates the forwarding behaviour to multiple Openflow switches. OpenFlow 1.1, introduces pipeline processing of the flow tables. This helps to improve flexibility and performance. This paper presents an implementation of the version 1.1 of OpenFlow capable to achieve a good performance. Knowing...
In recent years, significant research has been conducted to boost the performance and increase the reliability of high performance computing (HPC) clusters. As the number of compute nodes in modern HPC clusters continues to grow, it is critical to design clusters with low power consumption and low failure rate. In particular, it is widely known that the internal disk drives of compute nodes (in the...
Nowadays broadband technologies have been introduced in millions of homes worldwide. They allow Services Providers to offer services with high bandwidth requirements, as IPTV. Essential for these services is the Quality of Experience (QoE) as it is perceived by the user. This paper presents a low cost device and a procedure to measure on-line the quality of a video streaming according to the end user...
Grids can be considered as dominant platforms for large-scale parallel/distributed computing in science and engineering. Clouds allow users to acquire and release resources on-demand. Next generation computing environments will benefit from the combination of Grid and Cloud paradigms providing frameworks that integrate traditional Grid services with on-demand Cloud services. Nowadays, workflows are...
Adaptation mechanisms, such as transmission power control (TPC) techniques, cognitive radio technology and intelligent antenna, have been applied to efficiently manage the use of resources on wireless ad hoc networks. However, these mechanisms open doors for Reduction of Quality (RoQ) attacks. Those attacks damage network services exploiting adaptation capability and they can be easily launched on...
Future cellular systems demand higher throughput as an important requirement, along with smaller cell sizes to characterize the performance of network services. This paper purposes a way to optimize the multihop cellular network (MCN) deployment in LTE-A/Mobile WiMAX broadband wireless access systems. A simple way to optimize the MCN is to associate direct and multihop users based on maximum channel...
For a Carrier Ethernet or MPLS-TP service provider the determination of a multipoint-to-multipoint (mp2mp) virtual connection must be done in an efficient way in order to maximise network performance. This problem can be formulated as a Steiner tree problem which is a very complex combinatorial problem, being NP-complete. In general, any transport network ideal management system should seek to balance...
With the advances in voice recognition and synthesis, voice-interactive applications are reaching the mass mobile market. However, creating, deploying or managing context-rich voice-driven applications is complicated due to the scattered and highly diverse nature of specific pieces of software, tools and skills required for a complete system solution. To overcome this, we propose a novel unifying...
This paper provides a mathematical formulation for Downlink Inter-Cell Interference Coordination (ICIC), in the context of a 3GPP Long-Term Evolution (LTE) Self-Organizing Network (SON). SON concepts have been introduced in LTE standardization in order to increase the network performance and reduce the operational expenditure for operators. Among the proposed SON use cases, ICIC is of utmost importance,...
Policies have the potential of playing a key role in Service Oriented Computing (SOC) providing many useful features for service creation, execution and management. However, so far the Policy-Based Management area has had a limited adoption and the result is that its advocated benefits still remain unproven in a broader sense. In this paper we show that the integration of policies with services using...
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