Michelle Sibilla

QoCIM: A Meta-model for Quality of Context

In the last decade, several works proposed their own list of quality of context QoC criteria. This article relates a comparative study of these successive propositions. The result is that no consensus has been reached about the semantic and the comprehensiveness of QoC criteria. Facing this situation, the QoCIM meta-model offers a generic, computable and expressive solution to handle and to exploit any QoC criterion within distributed context managers and context-aware applications. For validation purposes, QoCIM is successfully applied to the modelling of a set of simple and composite QoC criteria.

A Contextual GRID Monitoring by a Model Driven Approach

This paper presents our approach for grid monitoring: A contextual grid monitoring by a model driven approach. Our approach consists in supervising an entity by taking into account the events occurring on its environment of execution and by automating the update of these influences. In this context, we propose a unified grid model by extending the standardized DMTF/CIM model. We formalized influences between the grid components and their execution context by integrating UML Statechart diagram into CIM.

Managing polling adaptability in a CIM/WBEM infrastructure

Nowadays, new management paradigms are based on more and more autonomous and decentralized decision-making. Thus, an adaptive management of the volume and the quantity of information supplied by the monitorisng mechanisms is essential. This paper presents works in progress carried out to facilitate the automation of the monitoring processes adaptation. It focuses on a control-oriented characterization of polling mechanisms that leads to the specification of a set of parameters affecting the polling execution, and to a formal representation of the polling mechanism and of the monitoring adaptability. An “adaptable poller” module, based on a unified algorithm which is able to consider, initially and at run-time, the variations of the polling parameters, has been designed, developed and tested in a CIM/WBEM environment. This module offers a polling service that can be controlled by any business management component that would wish to act both on the quality of the information collected and on the performances of the polling mechanism itself.

The QoCIM Framework: Concepts and Tools for Quality of Context Management

In the last decade, several works proposed their own list of quality of context (QoC) criteria. This chapter relates a comparative study of these successive propositions and shows that no consensus has been reached about the semantic and the comprehensiveness of QoC criteria. Facing this situation, the QoCIM meta-model offers a generic, computable and expressive solution to handle and exploit any QoC criterion within distributed context managers and context-aware applications. For validation purposes, the key modelling features of QoCIM are illustrated as well as the tool chain that provides developers with QoCIM based models editor and code generator. With the tool chain, developers are able to define and use their own QoC criteria within context and quality aware applications.

Extending Ambient Intelligence to the Internet of Things: New Challenges for QoC Management

Quality of Context (QoC) awareness is recognized as a key point for the success of context-aware computing solutions. At a time where the Internet of Things, Cloud Computing, and Ambient Intelligence paradigms bring together new opportunities for more complex context computation, the next generation of Multiscale Distributed Context Managers (MDCM) is facing new challenges concerning QoC management. This paper presents how our QoCIM framework can help application developers to manage the whole QoC life-cycle by providing genericity, openness and uniformity. Its usages are illustrated, both at design time and at runtime, in the case of an urban pollution context- and QoC-aware scenario.

Towards a validation framework for dynamic reconfiguration

Regardless of the management functional domains, autonomous reconfiguration activities are the principal means through which self-management is carried out. However, the presence of dynamic reconfiguration should not endanger the systems operation, otherwise it would nullify the underlying expected benefits. Hence, management systems should include a validation capability to guarantee the correctness and the safety of reconfiguration activities. This paper presents work in progress in building a validation framework that covers the entire reconfiguration scenario - from the validation of proposed changes to the validation of their application.

Interworking Components for the end-to-end QoS into IMS-based architecture mono provider

The users wish to communicate through collections of networks using different protocols, rendering service mapping from one network to another with the similar QoS is a complex issue thereby. The heterogeneous networks are collections of communication platforms using different protocols. This heterogeneity implies the need to offer many different services on the market within short time. With the emergence of IMS and the introduction of IP and SIP protocols as a means for achieving network homogeneity, service interoperability has become primordial. Regarding this issue, the present paper proposes a solution for homogenizing IMS networks with respect to the utilized QoS settings and charging policy. Therefore, we suggest solutions to both problems of mapping QoS on heterogeneous networks and implementing service level charging independently of the underlying network. Particularly with regard to these problems, our method presents a mechanism which can be deployed in heterogeneous networks to preserve the original QoS values of the user session and thus eliminate the cumulative effect of QoS rounding across the entire communication path. And it is feasible via the “Interworking QoS Management Subnetwork” while adding the new interworking management components, namely: SICs, DIC and HSS+.

A Control of a Mono and Multi Scale Measurement of a Grid

The capacity to ensure the seamless mobility with the end-to-end Quality of Service (QoS) represents a vital criterion of success in the grid use. In this paper we hence posit a method of monitoring interconnection network of the grid (cluster, local grid and aggregate grids) in order to control its QoS. Such monitoring can guarantee a persistent control of the system state of health, a diagnostic and an optimization pertinent enough for better real time exploitation. A better exploitation is synonymous with identifying networking problems that affect the application domain. This can be carried out by control measurements as well as mono and multi scale for such metrics as: the bandwidth, CPU speed and load. The solution proposed, which is a management generic solution independently from the technologies, aims to automate human expertise and thereby more autonomy.

An active CIM dependency pattern for a consistent service state monitoring

Before significant effects may be felt in service utilization by the user, detection of QoS degradation is a desirable requirement of service management. Management approaches define management information for each managed resource in a distributed environment, but a problem occurring on a resource denies access to its management information. A service has dependency relationships with all the components in the system, software or hardware. The paper focuses on the service level that is influenced by the subjacent levels, network and system, and elements, and investigates how to express these influences known by management experts in order to automate their processing. Our solution is to focus on the informational model independently from the other ones. The network and service management (NSM) domain is now on the way towards a unified and technology independent information model thanks to the CIM/DMTF specification of the WBEM initiative. This is to ensure both interoperability and the federation of management platforms from an informational point of view in the sense that the communication point of view is abstracted. This tendency opens new management modeling capabilities that the paper develops for consistent service monitoring.