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A multiadaptive sampling technique for cost-effective network measurements
Silva, João Marco C.; Carvalho, Paulo; Lima, SolangeThe deployment of efficient measurement solutions to assist network management tasks without interfering with normal network operation assumes a prominent role in today’s high-speed networks attending to the huge amounts of traffic involved. From a myriad of proposals for traffic measurement, sampling techniques are particularly relevant contributing effectively for this purpose as only a subset of the overall ...
Enhancing traffic sampling scope and efficiency
Silva, João Marco C.; Carvalho, Paulo; Lima, SolangeTraffic Sampling is a crucial step towards scalable network measurements, enclosing manifold challenges. The wide variety of foreseeable sampling scenarios demands for a modular view of sampling components and features, grounded on a consistent architecture. Articulating the measurement scope, the required information model and the adequate sampling strategy is a major design issue for achieving an encompassing...
A multidimensional model for monitoring cloud services
Palhares, Nuno; Carvalho, Paulo; Lima, SolangeThe complexity of monitoring cloud environments and the lack of standards so far urge for a careful analysis, systematizing and understanding of key points involved when assessing the services provided. In this context, this paper proposes a layered model for Cloud Services monitoring, identifying the multiple dimensions of monitoring, while combining the perspectives of service providers and customers. This pr...
An ontology for managing network services quality
Rodrigues, Carlos; Carvalho, Paulo; Álvarez-Sabucedo, Luis M.; Lima, SolangeThe evolution of IP networks to a service-oriented paradigm poses new challenges to service providers regarding the management and auditing of network services. The upward trend in ubiquity, heterogeneity and virtualization of network services and resources demands for a formal and systematic approach to network management tasks. In this context, the semantic characterization and modeling of services provided ...
Enabling self-adaptive QoE/QoS control
Lima, Solange; Carvalho, PauloHandling quality requirements of multimedia services and the expectations of end-users regarding the perceived service quality is currently a major issue for service providers in order to sustain service diversity and improve competitiveness. In this context, this paper presents ongoing work toward a service-oriented architecture for QoE/QoS evaluation and control, which can be deployed to assist the provision ...
Characterising University WLANs within Eduroam Context
Mulhanga, Maraganze; Lima, Solange; Carvalho, PauloThe eduroam initiative is assuming an ever growing relevance in providing a secure, worldwide roaming access within the university WLAN context. Although several studies have focused on educational WLAN traffic characterisation, the increasing variety of devices, mobility scenarios and user applications, motivate assessing the effective use of eduroam in order to sustain consistent network planning and deployme...
A Cooperative Network Monitoring Overlay
Castro, Vasco; Carvalho, Paulo; Lima, SolangeThis paper proposes a flexible network monitoring overlay which resorts to cooperative interaction among measurement points to monitor the quality of network services. The proposed overlay model, which relies on the definition of representative measurement points, the avoidance of measurement redundancy and a simple measurement methodology as main design goals, is able to articulate intra- and inter-area measurem...
A Semantic Model for Enhancing Network Services Management and Auditing
Rodrigues, Carlos; Carvalho, Paulo; Álvarez-Sabucedo, Luis M.; Lima, SolangeThe road toward ubiquity, heterogeneity and virtualization of network services and resources urges for a formal and systematic approach to network management tasks. In particular, the semantic characterization and modeling of services provided to users assume an essential role in fostering autonomic service management, service negotiation and auditing. This paper is centered on the definition of an ontology ...
Characterising Eduroam WLANs Usage Trends: A Case Study
Mulhanga, Maraganze; Lima, Solange; Carvalho, PauloThe recent commitment of European Universities to join a global wireless access and roaming infrastructure through the eduroam initiative has brought many advantages to the academic community. In a new environment of increasing user mobility, it is useful to study and understand the users' behaviour when accessing the wireless network infrastructure. This paper is focused on characterising the real network usag...
Toward a scalable and collaborative network monitoring overlay
Castro, Vasco; Carvalho, Paulo; Lima, SolangeThis paper presents ongoing work toward the definition of a new network monitoring model which resorts to a cooperative interaction among measurement entities to monitor the quality of network services. Exploring (i) the definition of representative measurement points to form a network monitoring overlay; (ii) the removal of measurement redundancy through composition of metrics; and (iii) a simple active mea...
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