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Snap and spread: A self-deployment algorithm for mobile sensor networks 1

引用

4th ieee international conference on distributed computing in sensor systems

作者： Bartolini, N. Calamoneri, T. Fusco, E. G. Massini, A. Silvestri, S. Univ Roma La Sapienza Dept Comp Sci Rome Italy

ISBN: (数字)9783540691709

ISBN: (纸本)9783540691693

The use of mobile sensors is motivated by the necessity to monitor critical areas where sensor deployment cannot be performed manually. In these working scenarios, sensors must adapt their initial position to reach a final deployment which meets some given performance objectives such as coverage extension and uniformity, total moving distance, number of message exchanges and convergence rate. We propose an original algorithm for autonomous deployment of mobile sensors called SNAP & SPREAD. Decisions regarding the behavior of each sensor are based on locally available information and do not require any prior knowledge of the operating conditions nor any manual tuning of key parameters. We conduct extensive simulations to evaluate the performance of our algorithm. This experimental study shows that, unlike previous solutions, our algorithm reaches a final stable deployment, uniformly covering even irregular target areas. Simulations also give insights on the choice of some algorithm variants that may be used under some different operative settings.

关键词： sensor networks

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Mobility control for complete coverage in wireless sensor networks

Mobility control for complete coverage in wireless sensor ne...

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28th international conference on distributed computing systems Workshops, ICDCS Workshops 2008

作者： Jiang, Zhen Wu, Jie Kline, Robert Krantz, Jennifer Computer Sci. Dept. West Chester University West Chester PA 19383 United States Computer Sci. and Eng. Dept. Florida Atlantic University Boca Raton FL 33431 United States

ISBN: (纸本)9780769531731

In this paper, we propose a new control method to cover the "holes" in wireless sensor networks. Many applications often face the problem of holes when some sensor nodes are disabled from the collaboration due to their failures and misbehavior. These holes may occur dynamically, and such a problem cannot be solved completely by simply deploying more redundant sensors. With a synchronization around each hole using the directed Hamilton cycle, one (and only one) snake-like cascading replacement process will be initiated in the local area in order to fill in that vacant area with a spare node. In this way, network connectivity and coverage can be guaranteed. Our analytical and experimental results show substantial improvements of such a replacement compared with the best result known to date. © 2008 ieee.

关键词： sensor nodes

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LiveNet: Using passive monitoring to reconstruct sensor network dynamics 1

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4th ieee international conference on distributed computing in sensor systems

作者： Chen, Bor-rong Peterson, Geoffrey Mainland, Geoff Welsh, Matt Harvard Univ Sch Engn & Appl Sci Cambridge MA 02138 USA

ISBN: (数字)9783540691709

ISBN: (纸本)9783540691693

We describe LiveNet, a set of tools and analysis methods for reconstructing the complex behavior of a deployed sensor network. LiveNet is based on the use of multiple passive packet sniffers co-located with the network, which collect packet traces that are merged to form a global picture of the network's operation. The merged trace can be used to reconstruct critical aspects of the network's operation that cannot be observed from a single vantage point or with simple application-level instrumentation. We address several challenges: merging multiple sniffer traces, determining sniffer coverage, and inference of missing information for routing path reconstruction. We perform a detailed validation of LiveNet's accuracy and coverage using a 184-node sensor network testbed, and present results from a real-world deployment involving physiological monitoring of patients during a disaster drill. Our results show that LiveNet is able to accurately reconstruct network topology, determine bandwidth usage and routing paths, identify hot-spot nodes, and disambiguate sources of packet loss observed at the application level.

关键词： sensor networks

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CaliBree: A self-calibration system for mobile sensor networks 1

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4th ieee international conference on distributed computing in sensor systems

作者： Miluzzo, Emiliano Lane, Nicholas D. Campbell, Andrew T. Olfati-Saber, Reza Dartmouth Coll Dept Comp Sci Hanover NH 03755 USA Dartmouth Coll Thayer Sch Engn Hanover NH 03755 USA

ISBN: (数字)9783540691709

ISBN: (纸本)9783540691693

We propose CaliBree, a self-calibration system for mobile wireless sensor networks. sensors calibration is a fundamental problem in a sensor network. If sensor devices are not properly calibrated, their sensor readings are likely of little use to the application. distributed calibration is challenging in a mobile sensor network, where sensor devices are carried by people or vehicles, mainly for three reasons: i) the sensing contact time, i.e., the amount of time nodes are within the sensing range of each other, can be very limited, requiring a quick and efficient calibration technique;ii) for scalability and ease of use, the calibration algorithm should not require manual intervention;iii) the computational burden must be low since some sensor platforms have limited capabilities. In this paper we propose CaliBree, a distributed, scalable, and lightweight calibration protocol that applies a discrete average consensus algorithm technique to calibrate sensor nodes. CaliBree is shown to be effective through experimental evaluation using embedded wireless sensor devices, achieving high calibration accuracy.

关键词： sensor nodes

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Optimal rate allocation for rate-constrained applications in wireless sensor networks 1

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4th ieee international conference on distributed computing in sensor systems

作者： Lin, Chun Lung Wang, Hai Fu Chang, Sheng Kai Wang, Jia Shung Natl Tsing Hua Univ Dept Comp Sci Hsinchu 30043 Taiwan

ISBN: (数字)9783540691709

ISBN: (纸本)9783540691693

This paper addresses the optimal rate allocation (ORA) problem as follows: given a target bit rate constraint, determine an optimal rate allocation among sensors such that the overall distortion of the reproduction data is minimized. Optimal rate allocation algorithms are proposed to determine the coding bit rate of each sensor in single hop and multi-hop sensor networks, given a target rate constraint. Extensive simulations are conducted by using temperature readings of the real world dataset. The results show that at low bit rates the optimal rate allocation improves about 2.745 dB on the uniform rate allocation in terms of SNR, and improves nearly 7.602 in terms of MSE. Spatial-temporal range queries are also evaluated to confirm that our approach is often sufficient to provide approximate statistics for range queries.

关键词： wireless sensor networks optimal rate allocation range query linear regression Embedded Zerotree Wavelet (EZW) coding

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Priority-based coverage-aware congestion control for multihop wireless sensor networks

Priority-based coverage-aware congestion control for multiho...

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28th international conference on distributed computing systems Workshops, ICDCS Workshops 2008

作者： Qiu, Xiaoling Ghosal, Dipak Mukherjee, Biswanath Yick, Jennifer Li, Deshi University of California Davis CA United States Qualcomm Inc. San DiegoCA United States Electronic Information Wuhan University China

ISBN: (纸本)9780769531731

Congestion in a Wireless sensor Network (WSN) can lead to buffer overflow, resource waste and delay or loss of critical information from the sensors. In this paper, we propose the Priority-based Coverage-aware Congestion Control (PCC), which is a distributed, priority-distinct, and fair mechanism. PCC provides higher priority to packets with event information, which the sink is more interested in. PCC employs a queue scheduler which can selectively drop any packet in the queue. PCC gives fair chance to all sensors to transmit packets to the sink, irrespective of their specific locations, and therefore enhances the coverage fidelity of WSNs. Based on a detailed simulation analysis, we show that PCC can efficiently relieve congestion and significantly improve the system performance based on multiple metrics such as event throughput and coverage fidelity. © 2008 ieee.

关键词： Wireless sensor networks

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Real-time routing in wireless sensor networks

Real-time routing in wireless sensor networks

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28th international conference on distributed computing systems Workshops, ICDCS Workshops 2008

作者： Ali, A. Latiff, L.A. Sarijari, M.A. Fisal, N. Faculty of Electrical Engineering University Technology Malaysia 81310 Johor Bahru Johor Darul Ta'zim Malaysia

ISBN: (纸本)9780769531731

In Wireless sensor Networks (WSNs), sensors gather information about the physical world and base station makes appropriate decision upon the environment. This technology enables users to effectively sense and monitor from a distance. WSN are slated to become very popular in the near future. It allows video/audio streaming to be transferred between sensor nodes in real-time. WSN can use real-time forwarding which means messages in the network are delivered according to their end-to-end deadlines (packet lifetime). This paper proposes a novel real-time routing protocol based on link quality, packet velocity over one-hop and remaining power in the sensor devices. The proposed routing has been successfully studied and verified through simulation and real test bed implementation. The results in this paper show that the proposed routing protocol has efficient power consumption, high packet delivery ratio and minimum control packet overhead in WSNs. © 2008 ieee.

关键词： Signal to noise ratio

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Preserving source-location privacy in energy-constrained wireless sensor networks

Preserving source-location privacy in energy-constrained wir...

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28th international conference on distributed computing systems Workshops, ICDCS Workshops 2008

作者： Yao, Jianbo Wen, Guangjun Chengdu Sichuan 610054 China Center of Information and Computation Zunyi Normal College Guizhou Zunyi 563002 China

ISBN: (纸本)9780769531731

As wide applications of wireless sensor networks, privacy concerns have emerged as the main obstacle to success. When wireless sensor networks are used to monitor sensitive objects, the privacy about monitored object' locations becomes an important issue. When a sensor node reports a monitored object to base station by sending a series of packets through multiple hops, an adversary may trace back the source's location. Flooding-based phantom has a problem that message latencies become larger and energy costs become higher for protecting source-location privacy. In this paper, DROW (Directed Random Walk) is proposed to make it difficult for an adversary to backtrack hop-by-hop to the origin of the sensor communication. In DROW, the source sensor sends out a packet, the packet is unicasted to its parent node. When intermediate node receives a packet, it forwards to one of its parent nodes in a directed random fashion. Compared to Flooding-based phantom, DROW has smaller message latencies and lower energy costs. Especially, DROW has better safety period when intermediate node has multi-parent node. © 2008 ieee.

关键词： Phantoms

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SAKE: Software Attestation for Key Establishment in sensor networks 1

引用

4th ieee international conference on distributed computing in sensor systems

作者： Seshadri, Arvind Luk, Mark Perrig, Adrian Carnegie Mellon Univ Pittsburgh PA 15213 USA

ISBN: (数字)9783540691709

ISBN: (纸本)9783540691693

This paper presents a protocol called SAKE (Software Attestation for Key Establishment), for establishing a shared key between any two neighboring nodes of a sensor network. SAKE guarantees the secrecy and authenticity of the key that is established, without requiring any prior authentic or secret information in either node. In other words, the attacker can read and modify the entire memory contents of both nodes before SAKE executes. Further, to the best of our knowledge, SAKE is the only protocol that can perform key re-establishment after sensor nodes are compromised, because the presence of the attacker's code in the memory of either protocol participant does not compromise the security of SAKE. Also, the attacker can perform any active or passive attack using an arbitrary number of malicious, colluding nodes. SAKE does not require any hardware modification to the sensor nodes, human mediation, or secure side channels. However, we do assume the setting of a computationally-limited attacker that does not introduce its own computationally powerful nodes into the sensor network. SAKE is based on ICE (Indisputable Code Execution), a primitive we introduce in previous work to dynamically establish a trusted execution environment on a remote, untrusted sensor node.

关键词： key establishment software attestation sensor networks

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Improving the data delivery latency in sensor networks with controlled mobility 1

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4th ieee international conference on distributed computing in sensor systems

作者： Sugihara, Ryo Gupta, Rajesh K. Univ Calif San Diego Dept Comp Sci & Engn San Diego CA 92103 USA

ISBN: (数字)9783540691709

ISBN: (纸本)9783540691693

Unlike traditional multihopforwarding among homogeneous static sensor nodes, use of mobile devices for data collection in wireless sensor networks has recently been gathering more attention. It is known that the use of mobility significantly reduces the energy consumption at each sensor, elongating the functional lifetime of the network, in exchange for increased data delivery latency. However, in previous work, mobility and communication capabilities are often underutilized, resulting in suboptimal solutions incurring unnecessarily large latency. In this paper, we focus on the problem of finding an optimal path of a mobile device, which we call "data mule," to achieve the smallest data delivery latency in the case of minimum energy consumption at each sensor, i.e., each sensor only sends its data directly to the data mule. We formally define the path selection problem and show the problem is NP-hard. Then we present an approximation algorithm and analyze its approximation factor. Numerical experiments demonstrate that our approximation algorithm successfully finds the paths that result in 10%-50% shorter latency compared to previously proposed methods, suggesting that controlled mobility can be exploited much more effectively.

关键词： Approximation algorithms

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