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The diversity in the way different cloud providers offer their services, give their SLAs, present their QoS, support different technologies, etc., complicates the portability and interoperability of cloud applications, and favors vendor lock-in. Standards like TOSCA, and tools supporting them, have come to help in the provider-independent description of cloud applications. After the variety of proposed...
Cognitive radio networks (CRNs) are composed of unprivileged users as called secondary users (SUs) that utilize the spectrum opportunities produced by the absence of co-located privileged primary users (PUs). Providing a certain level of quality of service (QoS) to these SUs is a very challenging problem as these users are constrained strictly by PU arrivals. Many existing works tackled this problem...
In the last years, several projects are emerged with the aim to addressing the challenge of providing solutions for deployment, monitoring, adaptation, and management of clouds belonging to different enterprises/organisations. In such scenarios the network connectivity is one of the key factors. SDN technologies represent a good solution to face this challenge. Separating the control plane from the...
Accommodating multiple different applications on a single sensor node or within the same wireless sensor network (WSN) offers numerous benefits including reduced deployment cost and improved utilization of the physical substrate. This paper presents a new middleware for WSNs, called Motley. Motley, enables a shared infrastructure and multi-application support for WSNs by providing services for the...
Adaptive content streaming is frequently used as an efficient and cheap solution to achieve a good quality for media streaming, in systems having light Over-the-Top architectures. The streaming system developed here makes an initial optimized server selection based on multi-criteria algorithms and then in-session media adaptation. The focus of this paper is on performance analysis (based on real-life...
This paper proposes an architecture for managing and distributing context information from an AAL (Ambient Assisted Living) environment to the cloud. The architecture, with semantic features, includes the processing of the sensed data using QoC (Quality of Context) parameters and data transport using SDN (Software-defined Networking). The experiments showed that the semantic context processing allows...
Software-Defined Networking (SDN) consists of two planes: the control and the forwarding plane. The control plane is moved out of the switch and into the separate, centralized controller, and is responsible for configuring the switch and programming the paths to be used by data flows. The controller hosting the applications collects information from the OpenFlow switch using the OpenFlow protocol...
As network complexity and heterogeneity have increased dramatically in the last decade, modern policy-based management techniques for adaptive routing decisions regarding path selection optimization and intelligent path control are necessary. In this paper, we analyze the application performance requirements, and the event-based management options for adaptive routing. Then, we propose an innovative...
We consider the problem of placing services in a telecommunication network in the presence of failures. In contrast to existing service placement algorithms that focus on optimizing the quality of service (QoS), we consider the performance of monitoring failures from end-to-end connection states between clients and servers, and investigate service placement algorithms that optimize the monitoring...
The trend towards more and more efficient computing resources, yet preserving quality of service, is particularly relevant in datacenters and in cloud infrastructures, where a rigorous and adequate management of resources is performed. Resource monitoring, optimization criteria, adaptive mechanisms are being intensively studied from constantly improving efficiency and reducing the environmental impact...
Cloud services span across geographically distributed data centers (DCs), between which a large amount of traffic is transfered. These DCs are interconnected via a wide area network (WAN) through statically set up Virtual Private Networks (VPNs), so they do not provide the flexibility offered by the modern cloud services. Moreover, the traffic over the WAN has many constraints (e.g., bandwidth, delay,...
In Software Defined Networks (SDN), intensive traffic monitoring is used to optimize the Quality-of-Service (QoS) of the network paths which are selected. Thus, we introduce the use of the Cognitive Packet Network (CPN) algorithm to SDN in order to optimize the search for new high-QoS paths. We install the CPN algorithm in the Cognitive Routing Engine (CRE), a new application software for SDN, and...
Telecom sector is in the middle of a global transformation. Drivers for this are changes in customer behavior and in the telecom industry itself. Today CSPs need a more sophisticated, real-time view of performance that provides a deeper understanding of how customers are using and experiencing specific services. Moving from network-centric toward customer-centric operations and introduction of Customer...
Resource allocation in multi-operator scenarios requires an estimate of the tenants' traffic needs. This is necessary in the scenario where a Mobile Network Operator (MNO) owns the Radio Access Network (RAN) and many Mobile Virtual Network Operators (MVNOs) act as resellers of their host network's capacity under their own brands, to their own customers. In such scenarios, the forecasted MVNO traffic...
In the present multipath transmission technology, lack of research on QoE evaluation mechanism, most of previous QoE evaluation mechanism applied to traditional p2p transmission, thus cannot give full play to the multipath QoE for path measurement, load distribution and congestion control management forecast monitoring function. Therefore, this paper from the current research situation and progress...
Nowadays, many companies have migrated their applications and data to the cloud. Among other benefits of this technology, the ability to answer quickly business requirements has been one of the main motivations. Thereby, in cloud environments, resources should be acquired and released automatically and quickly at runtime. This way, to ensure QoS, the major cloud providers emphasize ensuring of availability,...
The Arrowhead Framework is a European effort that aims to apply Service Oriented Architecture to the embedded systems' world. The Event Handler system is a component that supports the handling of events, and in that sense it enriches service-oriented applications with the capabilities of interacting via the publish/subscribe paradigm. In fact, the Event Handler system is in charge of the notification...
Software defined networking (SDN) provides a centralized control framework with real-time control of network components, residential customer routers in particular, that allows automated per-user bandwidth allocation. However, employing dynamic traffic shaping for efficient bandwidth utilization among residential users is a challenging task. In this context, understanding application usage requirements...
Reducing the energy consumed by wired computer networks is a challenge that has been actively investigated over the past few years. A popular mechanism proposed to reduce the consumption aims to put links and line cards to sleep mode during off-peak hours. Such a mechanism, however, decreases the available network capacity and increases the risk of congestion if traffic rises unexpectedly. This paper...
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