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In distributed Smart Farming applications, a reliable communication is often crucial, in particular during collaborating operations. In rural areas, the network connectivity via Public Land Mobile Networks is, however, not always sufficient. Network disruptions may occur hindering reliable transmissions. For the delivery of periodic sensor data streams of agricultural machines, several modern communication...
In this paper we introduce framework for implementation of automatically reconfigurable middleware layer for the system represented as a network of devices. The middleware enables communication between passive heterogeneous components of such distributed system by introducing dedicated service agents. Service agents establish run-time configurable data paths and they enable quality of service based...
Mobile operators are today facing the daunting challenge of providing cheap and valuable services to ever more demanding customers. As a matter of fact, mobile standards have not yet really addressed this expectation of open, cheap and flexible web oriented internet access. As an alternative, we introduced an IP-centric QoS model mainly inspired by IP policies commonly found in fixed networks. In...
Software Defined Networks are intended to be less complex, more flexible, and free of vendor-lock-ins. Therefore the Software Defined Networking (SDN) instantiation OpenFlow has been designed according to these properties. The efforts are expected to result in lower expenditure and operational costs. To reach these objectives, mechanisms of classical networks that provide established functionalities...
Garbage collection (GC) and resource contention on I/O buses (channels) are among the critical bottlenecks in Solid State Disks (SSDs) that cannot be easily hidden. Most existing I/O scheduling algorithms in the host interface logic (HIL) of state-of-the-art SSDs are oblivious to such low-level performance bottlenecks in SSDs. As a result, SSDs may violate quality of service (QoS) requirements by...
Distributed systems can be characterized by processes that communicate with each other by message passing, through communication channels, and may be located at several computers spread over a communication network. These processes and communication channels are usually characterized by synchronous or asynchronous timeliness behavior, according to the characteristics of underlying system (operating...
This paper presents the design and validation of an RFID module for the Network Simulator 2 which implements the ISO/IEC 18000-6C Class 1 Generation 2 standard, Schoute and Eom-Lee anti-collisions protocols in order to evaluate the performance of RFID systems and Internet of Things environments. The module includes mechanisms for the definition of parameters related to the standards and for QoS provision...
OpenFlow is the most promising architecture for future Software Defined Networks (SDNs). However, from the aspects of large-scale or carrier-grade networks, it still lacks some key components. For example, QoS (Quality of Service) provisioning is an indispensable part of such production networks. During the evolution of the OpenFlow standard, some QoS capabilities have been added to the protocol,...
QoS-aware service composition intends to integrate services from different providers and maximize the global QoS in order to increase the user's satisfaction degree while subjecting to dynamic context constraints. Current composition approaches only focus on optimizing a single process to maximize the satisfaction degree for one party. When multiple processes are performed concurrently by their selfish...
The paper discusses the infusion of context awareness in the management of data quality in a replicated sensor based data collection network. Given a 2-phase voting protocol to decide on data delivery from sensors to the end-user, the paper discusses the impact of environment parameters (such as fault severity and network message loss) and resource parameters (such as network bandwidth and number...
In this paper we introduce a reliable multicast concept for Device-to-Device (D2D) communication integrated into cellular network. In addition to the introduction of the basic concept, initial simulation results are presented as well. Clustering closely located devices which have local communication needs is a feasible and efficient way of solving the increasing data traffic requirements in the future...
In Internet networks, monitoring is necessary to guarantee the performance of the services. In this paper, we review the state-of-the-art monitoring architectures proposed for multi-domain networks. We note that these architectures do not support measurement configuration that enables the providers to perform flexible multi-domain measurements. Therefore, we present our proposal for the configuration...
Numerous studies based on complex measurement platforms have been carried out for over ten years now in order to discover the Internet topology on domain level. It turns out that this topology exhibits certain invariant properties such as a distribution of node degree. This distribution follows a power law. Moreover, the revealed topology is hierarchical. The hierarchy is caused by commercial contracts...
A widespread methodology for performance analysis in the field of communication systems engineering is network simulation. Network Simulator 2 (NS2) is one of the most popular tools in academia for evaluation of network, protocols and topologies. It has become virtually the standard of network simulation. It represents a discrete, event-based simulator that has an ability to be easily extendible and...
Research conducted at Morgan State University (MSU) has proposed a new approach for modeling and managing Quality of Service (QoS) in a cellular and ad-hoc mixed wireless network. This paper focuses on two key areas. It first introduces the “power” performance measure to model and manage the QoS requirements for wireless nodes with time critical applications as a function of the traffic level. It...
The spread use of wireless sensor networks (WSNs) in a variety of fields, ranging from the military to environmental protection, has drawn the attention of researchers to this type of networks. Despite their use in interesting applications, such as healthcare and surveillance, many shortcomings derived from their small size and constrained batteries limit their use, calling for solutions to enhance...
This article proposes an Active-Fault-Alarm (AFA) based Dynamic Temporary Protection Mechanism (DTPM) that is applied into the multi-protocol label switching transport profile (MPLS-TP) optical network. The new DTPM, by using the AFA function, can establish dynamically the so called temporary protection path (TPP) for the work path in advance before possible fault occurs and keep flexibly the TPP...
The QoS provisioning in home networks is being more often considered for future use cases, where multiple high bandwidth flows are accommodated in the home environment. This paper investigates chosen characteristics of one of the home network control and management protocol suites, namely UPnP. Using network modeling tools, we evaluate UPnP QoS Architecture and its resource management influence on...
Internet Advanced Technology Attachment (iATA) is a lightweight block-level protocol developed to transmit ATA commands over Internet. With the mass storage demand increasingly in mobile appliances, iATA provides an alternative cost-effective solution for clients to access and control remote storage devices freely. Number of Sectors per Command (NSPC) is the parameter contributes to iATA performance,...
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