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In this paper we present QOMB, a testbed we designed and implemented for the evaluation of wireless network systems, protocols and applications. The testbed uses the wireless network emulation set of tools QOMET so as to reproduce in a wired network, in real time, the wireless network conditions corresponding to a given scenario. In this context QOMET also provides support for features such as realistic...
In this paper, we introduce a distributed emulator for a pedestrian tracking system using active tags that is currently being developed by the authors. The emulator works on StarBED, which is a network testbed consisting of hundreds of PCs connected to each other by Ethernet. The three major components of the emulator (the processor emulator of the active tag micro-controller, RUNE, and QOMET) are...
Several choices have to be made during the design process of active tag based systems. Since the number of properties that must be decided before production and wide-scale deployment is relatively high, the use of real experiments in the design phase may be prohibitive. We propose the use of emulation for performing large-scale experiments with active tag based systems easily and in a repeatable manner...
Recently mobile robots act in various situations such as disaster areas, office buildings, factories and homes. When these new mobile robots are released, they should be confirmed to work correctly and safety from evaluation. In this paper, we propose large-scale simulation environment of mobile robots on StarBED which is a large-scale networked testbed. By using the simulation environment, we could...
In this paper we present an active tag emulation system that is used to carry out live experiments with active tag applications. Its two main components are the wireless communication emulator QOMET, and an active tag processor emulator. Experiments are performed using the experiment-support software RUNE on StarBED, the large-scale network testbed at the Hokuriku Research Center of the National Institute...
Research on wireless sensor networks has recently received much attention as they offer an advantage of monitoring various kinds of environment by sensing physical phenomenon. Among various issues, energy consumption is one of the most important criteria for routing protocol in wireless sensor networks (WSNs). This paper introduces an energy efficient clustering algorithm for mobile sensor network...
In this paper we introduce a distributed emulator for a pedestrian tracking system using active tags that is currently being developed by the authors. The emulator works on StarBED which is a network testbed consisting of hundreds of PCs connected to each other by Ethernet. The three major components of the emulator (the processor emulator of the active tag micro-controller, RUNE, and QOMET) are all...
Routing metrics play a critical role in wireless mesh networks (WMNs). Several metrics have already been proposed but none of them can effectively capture both local traffic load and hidden node issues. This paper proposes a load and interference-aware routing metric for wireless mesh networks, named contention window based (CWB) metric. Our metric assigns weights to individual links based on both...
Active tags are currently used for various tasks in transport and distribution industries, for factory automation or asset tracking. Pedestrian localization is another application of active tags, for which we develop a technique and a practical system. Following preliminary real-world experiments with a system prototype, we continued to develop our active tag based pedestrian localization technique...
We develop an emulation system for performing experiments related to active tag based pedestrian localization. We use emulation as an integral part of our development approach so as to be able to carry out large-scale experiments with ease, and in a repeatable manner. Our demonstration will show how to perform live emulation experiments on a remote network testbed located in Ishikawa, Japan. The experimental...
In this paper we present the design and usage of the multi-purpose wireless network emulator that we develop, QOMET. QOMET implements a two-stage scenario-driven approach to wireless network emulation. We give here the details of the improved model and additional functionality that make it currently possible to use QOMET to convert a real- world scenario to a sequence of network-condition descriptors...
In disaster areas, office buildings, or at home, multiple autonomous networked mobile robots may act instead of human beings. These robots have to move to their destiantion so as to perform their function. For this purpose they need to be able to recognize the changes in the surrounding environment. They are equipped with a motion-planning method in order to avoid in real time collisions with other...
We perform a demonstration of our research on sensor systems through the use of emulation on the particular case of network-enabled sensing robots. The experiment was performed remotely using virtual private network (VPN) technology on StarBED, the large-scale experiment environment of the National Institute of Information and Communications Technology (NICT), Hokuriku Research Center in Ishikawa,...
Nowadays many new technologies are being developed and introduced for Internet, home networks, and sensor networks. The new technologies must be evaluated in detail before deployment. However the above mentioned networks have a large number of nodes, and a complicated topology. We developed a large-scale, realistic and real-time network testbed, StarBED, using hundreds of PCs, and switched networks...
Nowadays many new technologies are being developed and introduced for Internet, home networks, and sensor networks. The new technologies must be evaluated in detail before deployment. However the above mentioned networks have a large number of nodes and a complicated topology. Therefore it is difficult to analyze such networks using typical network simulators. Accordingly testbeds for these networks...
In this paper we present the design of QOMET, the wireless LAN (WLAN) emulator that we develop. Our approach to WLAN emulation is a versatile two-stage scenario-driven design. In the first stage a real-world scenario representation provided by the user is converted successively into physical, data link and network layer effects that correspond to the emulated WLAN scenario. The output of the first...
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