1,721,070 research outputs found
Microservices From Cloud to Edge: An Analytical Discussion on Risks, Opportunities and Enablers
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Performance evaluation of a new technique for IP support in a WDM optical network: Optical composite burst switching (OCBS)
No full textIn this paper, the optical composite burst switching (OCBS) technique is proposed to be implemented in an all-optical backbone network to support Internet protocol (IP) traffic. The OCBS is based on two main features. First, several IP packets are assembled in a single macropacket, called burst. Second, the burst contention in an optical switch is handled by means of two techniques, the wavelength dimension and the burst-dropping (BD) technique. Different from traditional optical burst switching, where an entire burst is discarded when all of the output wavelengths are engaged at the arrival instant of the burst, a switch adopting the BD technique discards only the initial part of a burst finding all of the engaged output wavelengths while forwarding the final part of the burst, beginning at the instant in which one wavelength becomes free. The OCBS allows an increase in the switch throughput in terms of number of accepted IP packets because a burst contains a given number of IP packets. We introduce the analytical model that allows us to evaluate the effectiveness of the technique and, in particular, the obtained saving; furthermore, a sensitivity analysis of the saving, with respect to both the optical burst switch parameters and the traffic load, is carried out
Network layer solutions for a content-centric internet
Full text linkNowadays most people exploit the Internet to get contents such as web pages, music or video files. These users only value “what” they download and are not interested about “where” content is actually stored. The IP layer does the opposite and cares about the “where” and not about the “what”. This contrast between the actual usage of the Internet and the service offered by the IP layer is deemed to be the source of several problems concerning usability, performance, security and mobility issues. To overcome this contrast, research on the Future Internet is exploring novel so-called content-centric architectures, where the network layer directly provides users with contents, instead of providing communication channels between hosts. In this paper, we identify the main functionalities of a content-centric network (CONET), we discuss pros and cons of literature proposals for an innovative, content-centric network layer and we draw our conclusions, stating some general requirements that, in our opinion, a CONET should satisfy
Overlay, Borůvka-based, Ad-hoc multicast protocol: description and performance analysis
No full textThis paper presents a novel Mobile Ad-hoc NETworks (MANET) multicast protocol, named Overlay Borůvka-based Ad-hoc Multicast Protocol (OBAMP), and evaluates its performance. OBAMP is an overlay protocol: it runs only in the end-systems belonging to the multicast group. OBAMP has three distinctive features, which give to the protocol a good performance in terms of distribution efficiency: (i) its distribution tree closely resembles the minimum spanning tree; (ii) it exploits broadcast communications; (iii) its design limits not only overlay signaling but also network-layer signaling. In addition, OBAMP can cope with node failures in a very short time. As a consequence, OBAMP has a low latency and a high delivery ratio, even when the group size increases. To prove these statements, we analyze the performance of OBAMP with ns-2 and compare it with three state-of-the-art protocols, namely ODMRP (a network-layer protocol), ALMA, and AMRoute (two overlay protocols). The overlay protocols are assumed to use AODV as underlying routing protocol. Also, we stress that we have implemented OBAMP, in Java, and we have tested it on the field, to prove its feasibility; to allow fellow researchers to reproduce and test our work we published all simulation and implementation codes
ThingVisor factory: Thing virtualization platform for things as a service
No full textIn order to provide interoperability of cross-domain IoT applications involving different IoT platforms, the authors previously proposed a virtual IoT system called VirIoT. The proposed system is composed of two functionalities: ThingVisor and vSilo, and it aims at decoupling IoT device providers and IoT application developers. ThingVisor enables to produce virtual IoT devices, or Virtual Things, from physical IoT devices for sharing the physical devices among cross-domain IoT applications. In addition, vSilo enables to bridge between such Virtual Things and IoT applications for the interoperability of cross-domain IoT devices. In this paper, in order to enhance the VirIoT system, we propose ThingVisor Factory that helps to design ThingVisors in a user-friendly way and deploy them on demand autonomously by following container orchestration methodologies, such as Kubernetes. ThingVisor Factory is based on two concepts: Dataflow programming-based Graphical User Interface (GUI) and service function chaining-based ThingVisor development
Distributed tracing for Service Function Chaining in Named Data Networking
No full textWith the rapid expansion of IoT, there is a growing demand for efficient data processing and network load optimization. Service Function Chaining (SFC) has emerged as a key technology for distributed processing, particularly in edge computing environments. While SFC is traditionally implemented over IP networks, recent research has explored Named Data Networking (NDN) as a more flexible alternative, leveraging its content caching and name-based forwarding. However, NDN's inherent request aggregation and multicast mechanisms introduce unique challenges in applying conventional distributed tracing techniques, which are crucial for SFC applications to understand potential root causes of problems.This paper proposes a distributed tracing method for NDN-based SFC (NDN SFC) that enables packet flow visualization and network latency analysis. Our method introduces logging agents on NDN routers to capture request flows and inter-node delays, which are then formatted using OpenTelemetry for seamless integration with visualization tools such as Grafana® and Jaeger.Our tracing method helps to optimize service chains, to enhance network performance evaluation, and to streamline debugging, making NDN SFC deployment more practical. By offering a more efficient alternative to traditional IP-based SFC, our method supports the practical adoption of NDN SFC in IoT and edge computing environments
The Bluetooth Technology: State of the Art and Networking Aspects
No full textBluetooth is considered as a low-cost short-range wireless technology to provide communication functionalities, ranging from wire replacement to simple personal area network. In Bluetooth local networking applications a critical issue still under study is the evaluation of the network capacity when multiple piconets are simultaneously active in the same area, while providing mutual interference. In this paper we first provide a review of the main characteristics of the Bluetooth technology then we propose a semi-analytical approach to calculate the packet loss probability, and the aggregate network throughput. The analytical approach was validated by extensive comparison with simulation results showing a good agreement
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