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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...
Change management in a cloud environment is often complicated by the different needs of the cloud clients. Changes are not applied all at once. For example, a client may require that a change to the Platform-as-Service (PaaS) instance assigned to it must only be done on the weekend while another client allows for the change to be done at any time. The time periods at which changes can be applied may...
Node failures may be frequent in MANETs, but there can be many different causes for those failures. Nodes may lose power, crash, or simply move out of range of other nodes in the network. Identifying the root cause is complicated by a lack of fixed monitoring and analysis infrastructure. Past research has focused on monitoring using either ping, heartbeat, or gossip-based approaches, which can incur...
AMF (Availability Management Framework) is a middleware service that manages the availability of applications. AMF has been defined by the Service Availability Forum (SA Forum). An AMF configuration for an application running on top of AMF is a logical organization of hardware and software resources to provide and protect services. Resources, namely components, are grouped into logical entities such...
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...
Changes that are operated by autonomic networks and systems may generate vulnerabilities and increase the exposure to security attacks. We present in this paper a new approach for increasing vulnerability awareness in such self-managed environments. Our objective is to enable autonomic networks to take advantage of the knowledge provided by vulnerability descriptions in order to maintain safe configurations...
We describe a method for policy refinement. The refinement process involves stages of decomposition, operationalization, deployment and re-refinement, and operates on policies expressed in a logical language flexible enough to be translated into many different enforceable policy dialects. We illustrate with examples from a coalition scenario, and describe how the stages of decomposition and operationaliztion...
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...
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,...
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...
CloudOpt is a comprehensive approach to find optimal deployments for large service centers and clouds. It uses a combination of bin-packing, mixed integer programming and performance models to make decisions affecting diverse and strongly interacting goals, including satisfaction of different service level agreements for many different applications (involving response time, workload, throughput),...
Managing workload for large scale web applications is a fundamental task for satisfactory quality of service, low management and operation cost. In this paper, we present SCOPS, a system of distributed workload management to achieve service differentiation and overload protection in such large scale deployment. Our system splits the workload management logic into distributed components on each back-end...
Relay stations are an important component of heterogeneous networks (HetNets) introduced in the LTE-Advanced technology as a means to provide very high capacity and QoS all over the cell area. This paper develops a self-organizing network (SON) feature to optimally allocate resources between backhaul and station to mobile links. Static and dynamic resource sharing mechanisms are investigated. In the...
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,...
Scientific workflows are an enabler of complex scientific analyses. They provide both a portable representation and a foundation upon which results can be validated and shared. Large-scale scientific workflows are executed on equally complex parallel and distributed resources, where many things can fail. Application scientists need to track the status of their workflows in real time, detect execution...
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...
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...
Today, service provisioning suggests reserving network and equipment resources to satisfy a user request, but in the Next Generation Network and Next Generation Service (NGN / NGS) context the user's needs are becoming increasingly complex and need to take account the user mobility and preferences changes in the behavior of the service. Thus, it is necessary to reserve the “Service Resource” as well...
Home NodeB Gateway (HNB-GW) is a mobile operator's equipment through which Home NodeB (HNB) gets access to the core network. Without a Load Balancing (LB) mechanism, HNB-GWs' load distribution is determined by the random access of HNBs. HNB-GWs with too many HNBs may become overloaded easily. Once a HNB-GW is overloaded, other entering HNBs cannot be accepted and serviced due to the one-to-many relationship...
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