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Demo: PotatoScope - Scalable and Dependable Distributed Energy Measurement for WSNs

Demo: PotatoScope - Scalable and Dependable Distributed Ener...

引用

IEEE Communications Society Conference on Sensor and Ad Hoc Communications and networks (SECON)

作者： Robert Hartung Ulf Kulau Lars Wolf Institute of Operating Systems and Computer Networks Technische Universität Braunschweig Braunschweig Germany

ISBN: (纸本)9781509017331

This demo paper describes the usability and effectiveness of our distributed energy measurement system for WSNs. The system is composed of several micro-controller-based oscilloscopes - named PotatoScope. The intention of PotatoScope was to enable a scalable and dependable energy measurement for challenging environmental conditions, e.g., WSN outdoor deployments. We will present the general architecture by using two of our nodes and demonstrate how to measure energy consumption of nodes in our testbed. Certainly, the PotatoScope can be used standalone to measure energy comsumption of other devices, such as other micro controllers or single-board computers, e.g. Raspberry Pis. The demo will introduce a GUI, that displays information directly on a computer. Both the PotatoScope, including the hardware layout and the firmware, as well as the distributed energy measurement system is free to be used in own projects.

关键词： Energy measurement Current measurement Wireless sensor networks Servers Graphical user interfaces Universal Serial Bus computer architecture

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Amphisbaena: A Two-Platform DTN Node

Amphisbaena: A Two-Platform DTN Node

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IEEE Internatonal Conference on Mobile Adhoc and Sensor systems (MASS)

作者： Stephan Rottmann Robert Hartung Jan Käberich Lars Wolf Institute of Operating Systems and Computer Networks Technische Universität Braunschweig Braunschweig Germany

In most Wireless Sensor Network deployments, the energy supply is a major challenge. Especially for nodes with high computational power or high bandwidth communication interfaces, the required size of batteries might increase to infeasible levels, even if the option of energy harvesting exists. For many use cases, some nodes are idling most of the time and transmitting only a few bytes from time to time. In this paper, we present a two-platform node consisting of a high-power and a low-power platform. Both platforms are using the same Delay-Tolerant Networking (DTN) architecture and the same protocols. A novel concept offers the opportunity for both platforms to appear as a single node to communication partners. The high-power part is running a full-featured Linux operating system, the low power platform is built around an energy-efficient 32-bit microcontroller and is able to fulfill tasks, which would have required to wake up the high power node in a conventional setup. Our system can increase the energy efficiency in WSN scenarios where the demand of bandwidth and computational performance is strongly fluctuating.

关键词： Linux Batteries Wireless LAN IEEE 802.15 Standard Microcontrollers Universal Serial Bus Monitoring

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Demo: Automated valet parking and charging

Demo: Automated valet parking and charging

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IEEE Vehicular Networking Conference (VNC)

作者： Stephan Rottmann Julian Timpner Lars Wolf Institute of Operating Systems and Computer Networks Technische Universität Braunschweig Braunschweig Germany

A model electric vehicle performing automated valet parking and charging is demonstrated. The vehicle's missions are transmitted using WLAN based vehicle-to-infrastructure communications by a server back-end which... 详细信息

关键词： Vehicles Servers Sensors Batteries Pulse width modulation Wireless LAN Energy management

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Demo: A Node's Life -- Increasing WSN Lifetime by Dynamic Voltage Scaling

Demo: A Node's Life -- Increasing WSN Lifetime by Dynamic Vo...

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International Conference on Distributed Computing in Sensor systems (DCOSS)

作者： Ulf Kulau Wolf-Bastian Pöttner Felix Büsching Lars Wolf Institute of Operating Systems and Computer Networks Technische Universität Braunschweig Braunschweig Germany

In mobile applications, like wireless sensor networks, it is often inevitable to use a location-independent source of energy. Wherever the batteries capacity or inefficient energy harvesting limits the lifetime, other solutions have to be implemented to increase the energy efficiency. Dynamic Voltage Scaling (DVS) is a well known technique with the ability to adapt the voltage level to the actual system load to save energy. While it has been used in many application areas, DVS has not been studied sufficiently for wireless sensor nodes. In this demo, we show the benefits of DVS. We were able to optimize DVS for an 8-Bit ULP micro controller by a combination of DVS and dynamic power management (DPM). Moreover, we analyzed the effect of voltage scaling on other components of the sensor node (transceiver, sensors and memory).

关键词： Voltage control Clocks Wireless sensor networks Software Wireless communication Potentiometers Batteries

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Architecture and evaluation of INGA an inexpensive node for general applications

Architecture and evaluation of INGA an inexpensive node for ...

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IEEE SENSORS

作者： Felix Büsching Ulf Kulau Lars Wolf Technische Universität Braunschweig Institute of Operating Systems and Computer Networks (IBR) Braunschweig

ISBN: (纸本)9781457717666

INGA is a cost-efficient and universal wireless sensor node for activity monitoring and for general applications. INGA's architecture bases on an 8-bit Atmel microcontroller and runs Contiki OS and TinyOS “out of the box”. The motivation to develop INGA was driven by the need for a reasonable, cheap and expandable node for several use cases: On the one hand, in a research project, we intend to do a gait analysis of elderly persons with it, on the other hand we want to equip our student WSN lab with new nodes. For the first case none of the existing nodes fulfilled our requirements concerning assembled sensors and functionality. In this paper, we present the motivation and design for “yet another sensor node” furthermore, we present the detailed architecture and its benefits in comparison to other nodes. The first measurement results using INGA show its characteristics and usability. INGA is completely under open-source license and all resources are provided to the community.

关键词： Throughput Monitoring Ash Wireless sensor networks Packet loss Wireless communication

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Performance Enhancement in AODV with Accessibility Prediction

Performance Enhancement in AODV with Accessibility Predictio...

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IEEE Internatonal Conference on Mobile Adhoc and Sensor systems (MASS)

作者： Habib-ur Rehman Lars Wolf Institute of Operating Systems and Computer Networks (IBR) Technische Universität Brunswick Germany

The need for mobility awareness in ad hoc routing protocols is widely proclaimed. In this paper we present AODV-AP, a scheme to make AODV nodes aware of the accessibility of the neighbor nodes in the network. Nodes acquire the accessibility information of the other nodes through routine routing operations and keep it in their routing tables. later, this information can be utilized to enhance routing operations. One possible use of this accessibility information, restrict the route discoveries for inaccessible nodes, is also evaluated in this paper. Simulation results show that the use of accessibility knowledge in the route discovery process largely reduces the MAC and Routing overhead. Similarly, the Normalized Throughput with respect to MAC overhead is up to 3 times higher than that in standard AODV which reflects the effective use of network resources.

关键词： Routing protocols Ad hoc networks Network topology operating systems computer networks Throughput Analytical models Performance analysis Accreditation Telecommunication traffic

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RATFAT: Real-Time FAT for Cooperative Multitasking Environments in WSNs

RATFAT: Real-Time FAT for Cooperative Multitasking Environme...

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International Conference on Distributed Computing in Sensor systems (DCOSS)

作者： Sebastian Schildt Wolf-Bastian Pöttner Felix Büsching Lars Wolf Institute of Operating Systems and Computer Networks Technische Universität Braunschweig Braunschweig Germany

Today, many sensor nodes are equipped with a microSD slot to provide a cost effective way to store large amounts of data. When using the FAT file system, data collected by a node can be easily read by a PC without the need for any special software or communication protocol. While several FAT implementations for microcontrollers do exist, they are not suited for real-time applications. For a WSN in an industrial scenario where a node needs to run a closed loop control program, logging to a non-real-time capable persistent storage system is not an option. In this paper we present RATFAT, an efficient implementation of a flexible real-time capable FAT file system for Contiki, that can be used for applications requiring real-time guarantees.

关键词： Real-time systems Writing Wireless sensor networks Microcontrollers Multitasking Distributed databases Ash

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Impact of Perspectives on Collective Perception

Impact of Perspectives on Collective Perception

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International Conference on Intelligent Transportation

作者： Alexander Willecke Cengiz Yazici Lars C. Wolf Technische Universität Braunschweig Institute of Operating Systems and Computer Networks Braunschweig Germany

ISBN: (数字)9798331505929

ISBN: (纸本)9798331505936

Collective Perception (CP) is the key technology for integrating non-connected road users into the Cooperative-Intelligent Transportation System. Thereby, ITS-Stations share locally perceived object data with others via broadcast communication. Previous studies on CP focused on the trade-off between resource usage and Environmental Awareness Ratio, assuming that atomic objects are either known or unknown. However, Perceived Objects consist of multiple attributes describing their state, such as position, speed, and dimensions. Stations perceive the traffic situation and objects from different perspectives, influencing which attributes can be observed. This study shows the performance of CP in three different traffic scenarios and analyzes the completeness of objects and availability of object attributes. It shows that completeness and availability depend on the traffic situation and are influenced by average speed, traffic, building density, and road layouts. Furthermore, results indicate that important object attributes, such as dimensions, are often missing, and the object's center point is often unknown.

关键词： Measurement Layout Buildings Transportation Ear Traffic control Road safety Safety

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Demonstration of the Wireless Two-Platform DTN Node Amphisbaena

Demonstration of the Wireless Two-Platform DTN Node Amphisba...

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IEEE Internatonal Conference on Mobile Adhoc and Sensor systems (MASS)

作者： Stephan Rottmann Björn Gernert Lars Wolf Institute of Operating Systems and Computer Networks Technische Universität Braunschweig Braunschweig Germany

In this paper, we present the usage of our two-platform DTN node "Amphisbaena". It is designed for wireless outdoor operation without the need of an external energy supply. A Low Power Platform is running continuously and is able to power up a Linux based SBC on demand. Both parts are using the same communication protocol and appear as a single node to neighbors. In this demonstration we show the system in an example application, which allows to capture an image from a webcam attached to the High Power Platform. The request for the image is sent using a low power link while the answer is transferred using WiFi from the SBC.

关键词： IEEE 802.11 Standard IEEE 802.15 Standard Ad hoc networks Batteries Wireless sensor networks Cameras Wireless communication

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Probe-Based Transmission Power Control for Dependable Wireless Sensor networks

Probe-Based Transmission Power Control for Dependable Wirele...

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International Conference on Distributed Computing in Sensor systems (DCOSS)

作者： Wolf-Bastian Pöttner Lars Wolf Institute of Operating Systems and Computer Networks (IBR) Technische Universität Braunschweig Braunschweig Germany

Dependable Wireless Sensor networks for industrial process automation, monitoring and control applications have high demands regarding network reliability in terms of timely delivery and packet loss. In large industrial facilities, interference between neighboring networks is a major problem that can be mitigated by reducing the radio transmission power to the necessary minimum. However, reliability of the network should not be compromised even in spite of packet loss bursts. In this paper we aim at keeping the link within certain burstiness bounds while still minimizing the transmission power. We present evaluation results showing that the burstiness changes with the receiver signal strength. Based on this observation we present two mechanisms for dependable wireless sensor networks and study the performance in our testbed.

关键词： Receivers Probes Time division multiple access Schedules Packet loss Attenuation

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