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In this paper we address the problem of creating a remote testbed for distance learning. The area we focused on is the study of the problems involved in managing quality of service in networks for real-time applications, like those to be found in a factory, testing various ways of handling traffic in routers and controlling congestion. The testbed incorporates various operating modes that the user...
Energy is a scarce resource in wireless sensor networks. Usually, during the deployment phase an appropriate duty cycle has to be found to adjust the trade-off between energy consumption and transmission delay. In this paper an adaptation algorithm for the duty cycle adjustment during runtime of the sensor network is proposed. Thereby, the traffic originating from sensor nodes is monitored in the...
OPC-XML defines a standard method for accessing automation data in the industry field. This protocol relies on Web service communications allowing a great compatibility and a software/hardware independent definition. Nevertheless, this underlying protocol does not take into account temporal Quality of Service. Therefore, when a contract is defined between the client and the server, its execution has...
This paper presents an architecture to build distributed embedded real-time systems in the RTLinux-GPL platform. The architecture (built in a layered fashion) has being built around open source projects ranging from Ethernet drivers to a CORBA environment. The paper focuses on those layers that give support for QoS and real-time networking over Ethernet networks. The main ideas are: to accomplish...
Industrial communication systems (ICS) are specifically designed for deterministic communication between sensors, actuators, programmable logic controllers, monitoring systems, and operator workstations. These networks are traditionally based on wired technology and a deterministic medium access control. Nowadays, the emerging trend is the availability of wireless technology for ICS, since this leads...
For supporting applications with different timing constraints, a PLC (power line communication) system must provide differentiated QoS (quality of service). In this paper a traffic dispatching policy is specified and implemented which guarantees both required periodic data update and short end-to-end delay of aperiodic data request services. This policy is compared with the classic dual-priority one...
The approach presented in the paper deals with the analytical evaluation of the performance of predictive p-CSMA with no collision detection under saturation conditions, when all the nodes have always packets to send. Predictive p-CSMA employed in the MAC sublayer of LonTalk/EIA 709.1 protocol is the heart of communication capability of Lon Work's networks. It is displayed that the behavior of the...
Traditional shared Ethernet networks have a non-deterministic behaviour, which impairs the support of real-time communication. In this paper, it is proposed a shared Ethernet deterministic architecture, able to interconnect sensors, controllers and actuators at the field level, allowing the coexistence of standard devices with enhanced (real-time) devices. Such solution is based on the control of...
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