The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this work we report experimental tests on the performance of FTTX accesses using the mPlane measurement plane, including lab and field environments and above all we point out the role of such measurement plane in Software Defined Network architectures. For such an aim we show an experimental procedure based on a central unit (orchestrator) that automatically manages GbE links in a regional network...
Cloud services are gaining popularity with times. Service level agreement (SLA) serves a basic understanding between the clients and cloud service providers (CSP). Ensuring secured and adequate service is a basic need of the customers. In this work a set of compliance parameters for cloud service level agreement is identified. A generic rule base is designed to empower the process with an automated...
Service Assurance (SA) is a significant part of Network Function Virtualization (NFV) to enable automated and efficient service delivery from end to end (E2E). In NFV, SA should be integrated into the design and development loop from the beginning. However, it sees slower pace than other NFV management and orchestration (MANO) components. Most of present NFV-SA solutions are partial and do not provide...
The emergence of Internet of Things (IoT) promises to solve a wide range of issues that are related to the management of existing resources and delivery of new human-centric services in urban environments. IoT is being harnessed to benefit a wide range of Smart City applications including (but not limited to) holistic urban planning, tracking of city wide services, enhancing public transportation,...
Aiming at meeting the application requirements of low time delay and packet lose rate of wireless HD video PAN, an Video Point Coordination Function (VPCF) mechanism for MAC layer scheduling based on IEEE 802.11 PCF is proposed in this paper. TSP service periods are allocated to video station, which has burst video frames to transfer, and the number of needed CBAP (Slot Period Transmission), is evaluated...
Network Function Virtualization is an emerging paradigm to allow the creation, at software level, of complex network services by composing simpler ones. However, this paradigm shift exposes network services to faults and bottlenecks in the complex software virtualization infrastructure they rely on. Thus, NFV services require effective anomaly detection systems to detect the occurrence of network...
Quality of Service (QoS) in networking is a way of managing the network resources effectively. QoS has been widely used in traditional network and can also be implemented in Software Defined Network (SDN). Software Defined Network is a new network paradigm that decouples the control plane from the data plane in the network and thus create a network that is scalable, dynamic and easily manageable....
This paper sketches a service-oriented and hierarchical queuing mechanism designed to manage radio buffers while delivering web services. The goal is avoid buffer overflow implementing a three-level queuing mechanism. The first level is the message queue which stores messages from user-facing services. At the second level, the messages are fragmented into IP packets which are stored in the packet...
Large scale observatories are shared-use resources that provide open access to data from geographically distributed sensors and instruments. This data has the potential to accelerate scientific discovery. However, seamlessly integrating the data into scientific workflows remains a challenge. In this paper, we summarize our ongoing work in supporting data-driven and data-intensive workflows and outline...
The current and future trend in building and home automation sees an increasing pervasiveness of Internet of Things technologies, that allow to implement networks of low power sensors and actuators, and, at the same time, to enable advanced services and applications. In this paper we propose the use of a common protocol in the IoT domain, the MQTT, over a LoRa physical communication link, to jointly...
Streaming media applications generate a sizable part of network traffic and represent a significant proportion of network providers' income. The commitment to user satisfaction can be summarized by different concepts, content providers emphasizing quality of experience (QoE), whereas network providers are more focused on quality of service (QoS). Measuring QoS parameters, and understanding the relationship...
As demands on new software increase, new approaches are needed to help developers ensure Quality of Service (QoS) for their offered service. In this paper we present a QoS modeling approach that complements and extends the standard microservice and component-based software engineering tools by giving the software engineer information on what Non-Functional Requirements (NFRs) and quality constraints...
Virtualization technologies allow cloud providers to optimize server utilization and cost by co-locating services in as few servers as possible. Studies have shown how applications in multi-tenant environments are susceptible to systems anomalies such as abnormal resource usage due to performance interference. Effective detection of such anomalies requires techniques that can adapt autonomously with...
This paper addresses the shared resource contention problem associated with the auto-parallelization of running queries in distributed stream processing engines. In such platforms, analyzing a large amount of data often requires to execute user-defined queries over continues raw-inputs in a parallel fashion at each single host. However, previous studies showed that the collocated applications can...
The quality of service is one of challenges posed by the Cloud Computing. This issue plays an important role in making the Cloud services acceptable to customers, denotes the levels of performance, reliability, and availability offered by Cloud services. Literature has reported many implementations for measuring and ensuring QoS in Cloud Computing systems to achieve better results and meet the needs...
According to Forbes collected data, the public cloud services market will rise in 2016 and is expected to grow to $105 billions and, in fact, Virtual Machines (VMs) are one of the most popular tools for building “Cloud” services. But in service delivery such composition of multiple components greatly complicate analysis of product quality, especially if it is about Voice over IP (VoIP) set of services,...
The advances in wireless low-power sensors and the increasing demand for portable healthcare monitoring systems have inspired the realization of Wireless Body Sensor Networks (WBSNs). IEEE Std. 802.15.6 defines the communication protocol for WBSN applications in terms of physical and medium access layers. The high generality and flexibility of standard requirements poses the question of how WBSN parameters,...
The interconnection of several web services into single composite web services is known as Web Service Composition (WSC). WSC can be implemented in three different ways such as static, semi-dynamic and dynamic. In this research, the dynamic web service composition is accentuated as it is the most challenging method where it occurs during run time to fulfill the business process requirement. Too many...
In this paper, we elaborate an SDN orchestration solution aiming at the dynamic adaptation of service chain paths thereby addressing high-availability requirements of 5G applications. We present an SDN orchestrator that periodically monitors the availability of the network and, if necessary, promptly adapts service chain paths to recover from congestion events and to preserve network QoS performance...
We present a simple and low-cost method for estimating the symbol error rate (SER) and bit error rate (BER) for 4-ary pulse amplitude modulation (PAM-4) signals from the reconstructed eye diagrams obtained by using asynchronous sampling technique. The reconstructed PAM-4 eye diagram is divided into three separate sub-eyes. The optimal sampling position of the signal phase is obtained by overlapping...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.