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An adaptive communication architecture for wireless sensor networks 07

An adaptive communication architecture for wireless sensor n...

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proceedings of the 5th international conference on embedded networked sensor systems

作者： Dunkels, Adam Österlind, Fredrik He, Zhitao Swedish Institute of Computer Science Box 1263 SE-164 29 Kista Sweden

ISBN: (纸本)9781595937636

As sensor networks move towards increasing heterogeneity, the number of link layers, MAC protocols, and underlying transportation mechanisms increases. System developers must adapt their applications and systems to accommodate a wide range of underlying protocols and mechanisms. However, existing communication architectures for sensor networks are not designed for this heterogeneity and therefore the system developer must redevelop their systems for each underlying communication protocol or mechanism. To remedy this situation, we present a communication architecture that adapts to a wide range of underlying communication mechanisms, from the MAC layer to the transport layer, without requiring any changes to applications or protocols. We show that the architecture is expressive enough to accommodate typical sensor network protocols. Measurements show that the increase in execution time over a non-adaptive architecture is small. Copyright 2007 acm.

关键词： Wireless sensor networks

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Meeting Lifetime Goals with Energy Levels 07

Meeting Lifetime Goals with Energy Levels

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5th acm conference on embedded networked sensor systems

作者： Lachenmann, Andreas Marron, Pedro Jose Minder, Daniel Rothermel, Kurt Univ Stuttgart D-70569 Stuttgart Germany

ISBN: (纸本)9781595937636

In this paper we present Levels, a programming abstraction for energy-aware sensor network applications. Unlike most previous work it does not try to maximize network lifetime but rather helps to meet user-defined lifetime goals while maximizing application quality. Levels is targeted to applications where there is no redundancy and no node should fail early. With our programming abstraction the application developer defines so-called energy levels. these energy levels form a stack and can be deactivated from top to bottom if the lifetime goal cannot be met otherwise. Each code block within an energy level contains information about its energy consumption, which can be obtained from simulation tools without much effort. the runtime system then uses the data about the energy consumption of the different levels to compute an optimal level assignment for the time remaining. As we show in the evaluation, applications using Levels can accurately meet given lifetime goals and offer good application quality. In addition, the runtime overhead of our system is almost negligible.

关键词： Wireless sensor network energy lifetime goal programming abstraction

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Demo abstract: Multi-user data sharing in radar sensor networks

Demo abstract: Multi-user data sharing in radar sensor netwo...

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5th acm International conference on embedded networked sensor systems, SenSys'07

作者： Li, Ming Yan, Tingxin Ganesan, Deepak Lyons, Eric Shenoy, Prashant Venkataramani, Arun Zink, Michael Department of Computer Science University of Massachusetts Amherst MA 01003 United States

ISBN: (纸本)9781595937636

the emerging of rich sensor networks poses very different design challenges from traditional "mote-class" sensor networks. One important challenge is that these networks are designed to handle the diverse requirements of multiple users. In this work, we demonstrate how multiple end user needs are handled in rich sensor networks using a utility-driven architecture. We instantiate this architecture in the context of geographically distributed wireless radar sensor networks for weather, and demonstrate the real-time operation of the prototype on a radar testbed in Oklahoma.

关键词： Network architecture

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RCRT: Rate-Controlled Reliable Transport for Wireless sensor Networks 07

RCRT: Rate-Controlled Reliable Transport for Wireless Sensor...

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5th acm conference on embedded networked sensor systems

作者： Paek, Jeongyeup Govindan, Ramesh Univ So Calif Embedded Networks Lab Los Angeles CA 90089 USA

ISBN: (纸本)9781595937636

Emerging high-rate applications (imaging, structural monitoting, acoustic localization) will need to transport large volumes of data concurrently from several sensors. these applications are also loss-intolerant. A key requirement for such applications, then, is a protocol that reliably transport sensor data from many sources to one or more sinks without incurring congestion collapse. In this paper, we discuss RCRT, a rate-controlled reliable transport protocol suitable for constrained sensor nodes. RCRT uses end-to-end explicit loss recovery, but places all the congestion detection and rate adaptation functionality in the sinks. this has two important advantages: efficiency and flexibility. Because sinks make rate allocation decisions, they are able to achieve greater efficiency since they have a more comprehensive view of network behavior. For the same reason, it is possible to alter the rate allocation decisions (for example, from one that ensures that all nodes get the same rate, to one that ensures that nodes get rates in proportion to their demands), without modifying sensor code at all. We evaluate RCRT extensively on a 40-node wireless sensor network testbed and show that RCRT achieves more than twice the rate achieved by a recently proposed interference-aware distributed rate-control protocol, IFRC [23].

关键词： sensor networks Transport protocol Reliable Centralized End-to-end

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CountTorrent: Ubiquitous Access to Query Aggregates in Dynamic and Mobile sensor Networks 07

CountTorrent: Ubiquitous Access to Query Aggregates in Dynam...

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5th acm conference on embedded networked sensor systems

作者： Kamra, Abhinav Misra, Vishal Rubenstein, Dan Columbia Univ Dept Comp Sci New York NY 10027 USA

ISBN: (纸本)9781595937636

We study the problem of aggregate querying over sensor networks where the network topology is continuously evolving. We develop scalable data aggregation techniques that remain efficient and accurate even as nodes move, join or leave the network. We present a novel distributed algorithm called CountTorrent, that enables fast estimation of certain classes of aggregate queries such as COUNT and SUM. CountTorrent does not require a static routing infrastructure, is easily implemented in a distributed setting, and can be used to inform all network nodes of the aggregate query result, instead of just the query initiator as is done in traditional query aggregation schemes. We evaluate its robustness and accuracy compared to previous aggregation approaches through simulations of dynamic and mobile sensor network environments and experiments on micaz motes. We show that in networks where the nodes are stationary, CountTorrent can provide 100% accurate aggregate results even in the presence of lossy links. In mobile sensor networks where the nodes constantly move and hence the network topology changes continuously, CountTorrent provides a close (within 10 - 20%) estimate of the accurate aggregate query value to all nodes in the network at all times.

关键词： sensor networks Aggregate querying TinyOS micaz

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Simulation-Based Augmented Reality for sensor Network Development 07

Simulation-Based Augmented Reality for Sensor Network Develo...

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5th acm conference on embedded networked sensor systems

作者： Wen, Ye Zhang, Wei Wolski, Rich Chohan, Navraj UC Dept Comp Sci Santa Barbara CA USA

ISBN: (纸本)9781595937636

Software development For sensor network is made difficult by resource constrained sensor devices, distributed system complexity, communication unreliability, and high labor cost. Simulation, as a useful tool, provides an affordable way to study algorithmic problems with flexibility and controllability. However, in exchange for speed simulation often trades detail that ultimately limits its utility. In this paper, we propose a new development paradigm, simulation-based augmented reality. in which simulation is used to enhance development on physical hardware by seamlessly integrating a running simulated network with a physical deployment in a way that is transparent to each. the advantages of such an augmented network include the ability to study a large sensor network with limited hardware and the convenience of studying a part of the physical network with simulation's debugging, profiling and tracing capabilities. We implement the augmented reality system based on a sensor network simulator with high fidelity and high scalability. Key to the design are "super" sensor nodes which are half virtual and half physical that interconnect simulation and physical network with fine-grained traffic forwarding and accurate time synchronization. Our results detail the overhead associated with integrating live and simulated networks and the timing accuracy between virtual and physical parts of the network. We also discuss various application scenarios for our system.

关键词： sensor Network Simulation Debugging

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Fountain Reprogramming Protocol (FRP): A reliable data dissemination scheme for wireless sensor networks using fountain codes 07

Fountain Reprogramming Protocol (FRP): A reliable data disse...

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5th acm International conference on embedded networked sensor systems, SenSys'07

作者： Crepaldi, Riccardo Harris III, Albert Rossi, Michele Zanca, Giovanni Zorzi, Michele Department of Computer Science University of Illinois at Urbana-Champaign United States Department of Information Engineering University of Padova Italy

ISBN: (纸本)9781595937636

Wireless sensor network technologies enable a wide variety of applications (e.g., environmental monitoring). Such sensor networks are often deployed in regions that make it difficult to collect and redistribute the nodes for maintenance. However, there is often a need to reprogram all of the nodes in the network, either during application test phases on deployed networks, or to support software upgrades. therefore, a reliable method of sending a relatively large amount of data to each node in the network is required to support these functions.

关键词： sensor networks in-network programming

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Adaptive Sampling in the COlumbia RIvEr Observation Network 07

Adaptive Sampling in The COlumbia RIvEr Observation Network

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5th acm conference on embedded networked sensor systems

作者： Dang, thanh Bulusu, Nirupama Feng, Wu-chi Frolov, Sergey Baptista, Antonio Portland State Univ Dept Comp Sci Portland OR 97207 USA

ISBN: (纸本)9781595937636

the Columbia River (CoRie) Observation Network includes an extensive array of fixed stations monitoring the Columbia River estuary and nearby coastal ocean. At each station, variable combinations of in-situ sensors measure one or more physical properties of water or atmosphere. Using a multi-scale data assimilation model, the CORIE modeling system integrates models and field controls to produce a simulation of 3D circulation, in a region centered in the estuary and plume. the CORIE data assimilation framework [1] combines observational data with numerical data models to produce an estimated system state for the physical process. To augment the fixed observational network, additional data is collected during periodical cruises of a mobile sensor station. Because these cruises are expensive and rare, an important goal for scientists is to sample data at points that most reduce the uncertainty of the data assimilation model. this is challenging, since the estuary environment is very dynamic, and therefore the optimal cruise path cannot be determined in advance. the goal of our system is to move the mobile station as the data assimilation proceeds in order to maximally reduce the uncertainty in the data assimilation process.

关键词： sensor networks adaptive sampling data assimilation sigma point Kalman filter

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Flush: A Reliable Bulk Transport Protocol for Multihop Wireless Networks 07

Flush: A Reliable Bulk Transport Protocol for Multihop Wirel...

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5th acm conference on embedded networked sensor systems

作者： Kim, Sukun Fonseca, Rodrigo Dutta, Prabal Tavakoli, Arsalan Culler, David Levis, Philip Shenker, Scott Stoica, Ion Univ Calif Berkeley Div Comp Sci Berkeley CA 94720 USA

ISBN: (纸本)9781595937636

We present Flush, a reliable, high goodput bulk data transport protocol for wireless sensor networks. Flush provides end-to-end reliability, reduces transfer time, and adapts to time-varying network conditions. It achieves these properties using end-to-end acknowledgments, implicit snooping of control information, and a rate-control algorithm that operates at each hop along a flow. Using several real network topologies, we show that Flush closely tracks or exceeds the maximum goodput achievable by a hand-tuned but fixed rate for each hop over a wide range of path lengths and varying network conditions. Rush is scalable. its effective bandwidth over a 48-hop wireless network is approximately one-third of the rate achievable over one hop. the design of Rush is simplified by assuming that different flows do not interfere with each other, a reasonable restriction for many sensornet applications that collect bulk data in a coordinated fashion, like structural health monitoring, volcanic activity monitoring, or protocol evaluation. We collected all of the performance data presented in this paper using Flush itself.

关键词： Wireless sensor Networks Transport Interference

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Tracking Mobile Nodes Using RF Doppler Shifts 07

Tracking Mobile Nodes Using RF Doppler Shifts

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5th acm conference on embedded networked sensor systems

作者： Kusy, Branislav Ledeczi, Akos Koutsoukos, Xenofon Vanderbilt Univ Nashville TN 37203 USA

ISBN: (纸本)9781595937636

In this paper, we address the problem of tracking cooperative mobile nodes in wireless sensor networks. Aiming at a resource efficient solution, we advocate the use of sensors that maintain their location information and rely oil the tracking service only when their locations change. In the proposed approach, the tracked node transmits a signal and infrastructure nodes measure the Doppler shifts of the transmitted signal. We show that Mica2 motes can measure RF- Doppler shifts with 0.2 Hz accuracy corresponding to a 0.14 m/s error in relative speed estimates using radio interferometric technique. the tracking problem is modeled as a non-linear optimization problem and an extended Kalman filter is used to solve it accurately assuming Gaussian measurement errors. However, this approach may fail if the tracked node changes its speed or direction. We propose to update the Kalman filter state by performing constrained least-squares optimization when a maneuver is detected. the combined approach achieves almost a 50% accuracy improvement over the Kalman filter alone when the mobile node changes its direction and speed frequently. We describe our proof-of-concept implementation of the tracking service and evaluate its performance experimentally and ill simulation.

关键词： sensor Networks Doppler effect Tracking

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