Testbed

About: Testbed is a research topic. Over the lifetime, 10858 publications have been published within this topic receiving 147147 citations. The topic is also known as: test bed.

Mobility in WSNs for critical applications

Abstract: Recent critical application sectors of sensor networks like military, health care, and industry require the use of mobile sensor nodes, something that poses unique challenges in aspects like handoff delay, packet loss, and reliability. In this paper we propose a novel mobility model that handles those challenges effectively by providing on-time mobility detection and handoff triggering. In that way soft handoffs and controlled disconnections are assured. The proposed solution uses cross-layer information from the MAC and Network layers. Our solution was implemented and evaluated in an experimental testbed, in the context of the European FP7 GINSENG project.

Light-trail testbed for IP-centric applications

Abstract: The Internet transport infrastructure is evolving toward a model of high-speed routers interconnected by intelligent optical networks. In this article we review current optical networking architectures and describe a new concept proposed in A. Gumaste and I. Chlamtac [2003]: light-trails. We develop light-trails as a novel and amenable control and management solution to address IP-centric communication problems at the optical layer. We implement a testbed to demonstrate light-trail feasibility. We also present three medium access control protocols for light-trails and evaluate their performance. The goal of light-trails and our solution is to combine commercially available components with emerging network technologies to provide a transparent, reliable, and highly scalable communication network.

Modellus: Automated modeling of complex internet data center applications

Abstract: The rising complexity of distributed server applications in Internet data centers has made the tasks of modeling and analyzing their behavior increasingly difficult. This article presents Modellus, a novel system for automated modeling of complex web-based data center applications using methods from queuing theory, data mining, and machine learning. Modellus uses queuing theory and statistical methods to automatically derive models to predict the resource usage of an application and the workload it triggers; these models can be composed to capture multiple dependencies between interacting applications.Model accuracy is maintained by fast, distributed testing, automated relearning of models when they change, and methods to bound prediction errors in composite models. We have implemented a prototype of Modellus, deployed it on a data center testbed, and evaluated its efficacy for modeling and analysis of several distributed multitier web applications. Our results show that this feature-based modeling technique is able to make predictions across several data center tiers, and maintain predictive accuracy (typically 95p or better) in the face of significant shifts in workload composition; we also demonstrate practical applications of the Modellus system to prediction and provisioning of real-world data center applications.

Mobile Ad Hoc Network emulation environment

Abstract: To support research in wireless mobile ad hoc networks, the U.S. Army Research Laboratory (ARL) and Naval Research Laboratory (NRL) have worked jointly to establish an advanced emulation environment. A key component is a Mobile Ad-Hoc Network emulation testbed where algorithms and applications can be subjected to representative wireless network conditions. The testbed is based on a version of the “MANE” (Mobile Ad hoc Network Emulator) software originally developed by the Naval Research Laboratory (NRL). Consulting & Engineering Next Generation Networks (CENGEN) has enhanced MANE by implementing a modular, extensible architecture which allows advanced modeling methods and computing technologies to be incorporated into the environment. This paper discuses the current capabilities of Mobile Network Emulation for conducting empirical evaluation and demonstration of MANET technologies and is organized into 5 sections: (1) introduction to the role of emulation in network modeling, (2) mobile network emulators background (3) emulation system components (4) future plans and (5) conclusions.

The real-time ObjectAgent software architecture for distributed satellite systems

Abstract: The ObjectAgent system is being developed to create an agent-based software architecture for autonomous distributed systems. Agents are used to implement all of the software functionality and communicate through simplified natural language messages. Decision-making and fault detection and recovery capabilities are built-in at all levels. During the first phase of development, ObjectAgent was prototyped in Matlab. A complete, GUI-based environment was developed for the creation, simulation, and analysis of multiagent multisatellite systems. Collision avoidance and reconfiguration simulations were performed for a cluster of four satellites. ObjectAgent is now being ported to C++ for demonstration on a real-time, distributed testbed and deployment on TechSat 21 in 2003. The present architecture runs on a PowerPC 750 running Enea's OSE operating system. A preliminary demonstration of using ObjectAgent to perform a cluster reconfiguration of three satellites was performed in November 2000.