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Achieving fault tolerance in data aggregation in wireless sensor networks

Achieving fault tolerance in data aggregation in wireless se...

引用

50th Annual IEEE Global Telecommunications Conference, GLOBECOM 2007

作者： Banerjee, Torsha Bin, Xie Agrawal, Dharma P. OBR Center for Distributed and Mobile Computing Dept. of Computer Science University of Cincinnati Cincinnati OH 45221-0030

ISBN: (纸本)1424410436

This paper identifies faulty sensor(s) in a polynomial-based data aggregation scenario, TREG proposed in our earlier work. In TREG, function approximation is performed over the entire range of data and only coefficients of a polynomial (P) are passed instead of aggregated data. Performing further mathematical operations on the calculated P can identify the maximum (max) and minimum (min) values of the sensed attribute and their locations. Therefore, if any sensor reports a data value outside the [min, max] range, it can be identified as a faulty sensor. We achieve the following goals: (1) uncorrelated readings from a specific sensor helps in detecting a faulty sensor, (2) faulty sensors are detected near the source and isolated preventing them from affecting the accuracy of the overall aggregated data and reducing the overall delay. Results show that a faulty sensor can be detected with an average accuracy of 94%. With increase in node density, accuracy in faulty sensor detection improves as more nodes are able to report the information to their nearest tree node. © 2007 IEEE.

关键词： Fault tolerant computer systems

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The deafness problems and solutions in wireless ad hoc networks using directional antennas

The deafness problems and solutions in wireless ad hoc netwo...

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IEEE Global Telecommunications Conference Workshops, GLOBECOM 2004

作者： Gossain, Hrishikesh Cordeiro, Carlos Cavalcanti, Dave Agrawal, Dharma P. OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH 45221-0030 Nokia Research Center Networking Technologies Lab. Tampere Finland

This paper addresses the issue of deafness in directional antennas for wireless ad hoc networks. Deafness is caused when a node X repeatedly attempts to communicate with node Y but is unsuccessful, because Y is presently tuned to some other antenna beam. In this paper, we first outline different factors which contribute to such deafness in directional antennas and its significant impact on network performance. We then propose two schemes to overcome deafness scenarios which are transparent to the underlying directional MAC protocol in use. In addition, we also claim that IEEE 802.11 Short Retry Limit (SRL) needs a special handling in directional environment because of the presence of deafness. We have done a detailed performance evaluation of our schemes with different directional MAC protocols running over switched beam antennas and the initial results are found to be very promising. © 2004 IEEE.

关键词： Wireless telecommunication systems

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Broadcasting over switched single beam antennas

Broadcasting over switched single beam antennas

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2004 12th IEEE International Conference on Networks, ICON 2004 - Unity in Diversity

作者： Joshi, Tarun Cordeiro, Carlos Vogety, Sasidhar Yin, Jun Gossain, Hrishikesh Agrawal, Dharma P. OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH 45221-0030 United States Nokia Research Center Networking Technologies Lab Tampere Finland

ISBN: (纸本)078038783X

In switched single beam directional antenna model, broadcasting is achieved by sequentially steering the antenna beam across all pre-defined directions resulting in a sweeping delay. In this paper we study suggested techniques to alleviate broadcast storm problems in ad hoc networks with directional antennas, point out their shortcomings, and propose two new schemes, namely, the New Enhanced Directional Flooding (NEDF) and the Probabilistic Relay Broadcasting (PRB). We thoroughly compare the performance of these protocols with present directional broadcast schemes including omni directional flooding over six, twelve and eighteen antenna beam models. The results indicate that directional broadcasting provides excellent connectivity in the regions of sparse density as compared to omni directional broadcasting. © 2004 IEEE.

关键词： Broadcasting

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Probabilistic broadcasting based on coverage area and neighbor confirmation in mobile ad hoc networks

Probabilistic broadcasting based on coverage area and neighb...

引用

IEEE Global Telecommunications Conference Workshops, GLOBECOM 2004

作者： Kim, Jae-Soo Zhang, Qi Agrawal, Dharma P. Department of Computer Engineering Sangju National University Sangju Korea Republic of OBR Center for Distributed and Mobile Computing ECECS University of Cincinnati Cincinnati OH

Broadcasting is a fundamental and effective data dissemination mechanism for route discovery, address resolution and many other network services in ad hoc networks. While data broadcasting has many advantages, it also causes some problems such as the broadcast storm problem, which is characterized by redundant retransmission, collision, and contention. Although many approaches have been proposed to solve them, none of them guarantees the lowest bound. In this paper, we propose a probabilistic broadcasting based on coverage area and neighbor confirmation in mobile ad hoc networks. We use the coverage area of a node to adjust the rebroadcast probability. If a mobile node is located in the area closer to sender, which means it has small additional coverage and rebroadcast from this node can reach less additional nodes, so its rebroadcast probability will be set lower. On the other hand, if a mobile node is located in the area far from sender, which means that the additional coverage from this node is large, its rebroadcast probability will be set higher. The coverage area can be estimated from the distance between sender and receiver and the distance can be estimated by signal strength or global positional system. Our approach combines the advantages of probabilistic and area based approach. Simulation results show that our approach can improve the average performance of broadcasting in various network scenarios. Our approach is simple and can be easily implemented in MANET. © 2004 IEEE.

关键词： mobile telecommunication systems

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Connectivity in multi-radio, multi-channel heterogeneous ad hoc networks

Connectivity in multi-radio, multi-channel heterogeneous ad ...

引用

2005 IEEE 16th International Symposium on Personal, Indoor and mobile Radio Communications, PIMRC 2005

作者： Cavalcanti, Dave Gossain, Hrishikesh Agrawal, Dharma OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH 45221-0030 United States Mesh Research and Development Group Motorola Inc. Maitland FL

ISBN: (纸本)3800729091

Future wireless networks are expected to integrate heterogeneous devices equipped with multiple radios and different characteristics. Therefore, it is important to understand how these heterogeneous radios can affect connectivity and overall multi-hop network performance. In this paper, we study the connectivity of a heterogeneous ad hoc network. We consider two types of nodes: nodes equipped with a single communication interface with communication range r, and Dual-Mode (DM) nodes, equipped with two communication interfaces with two different communication ranges r and rf, respectively, where r f>r. We assume the radios in the DM nodes operate in two different channels. We provide a theoretical analysis of connectivity in a linear network and we present simulation results for the two-dimensional case that show the impact of DM nodes on connectivity, broadcast latency and robustness in static scenarios. © 2005 IEEE.

关键词： Ad hoc networks

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Throughput enhancement in wireless ad hoc networks with spatial channels a MAC layer perspective

Throughput enhancement in wireless ad hoc networks with spat...

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IEEE Symposium on Computers and Communications (ISCC)

作者： D. Lal R. Gupta D.P. Agrawal OBR Research Center for Distributed and Mobile Computing University of Cincinnati Cincinnati USA

The use of directional antennas in cellular wireless networks offers many advantages such as range extension, reduced interference for signal detection and improved throughput. MAC protocols using directional antennas for wireless ad hoc networks that are based on and similar to IEEE 802.11 type WLANs have been proposed. We explore 'multiplexing in space' with directional antennas to enhance the total throughput at a bottleneck node in the network. We develop an access protocol for antenna systems that can transmit to multiple destinations simultaneously (and possibly receive from multiple sources as well). Some issues enabling multiple access in space for ad hoc network nodes are discussed. Our simulation results show that the current 802.11 MAC scheme using omnidirectional antennas for channel access fairs very poorly as the bandwidth demand increases. In contrast, we see substantial improvement when spatial multiplexing is employed.

关键词： Throughput mobile ad hoc networks Directional antennas Access protocols Space exploration Cellular networks Wireless networks Interference Signal detection Media Access Protocol

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A cross-layer approach for designing directional routing protocol in MANETs

A cross-layer approach for designing directional routing pro...

引用

2005 IEEE Wireless Communications and Networking Conference, WCNC 2005: Broadband Wirelss for the Masses - Ready for Take-off

作者： Gossain, Hrishikesh Joshi, Tarun Cordeiro, Carlos Agrawal, Dharma P. OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH 45221-0030 United States Philips Research Wireless Communications and Networking Department Briarcliff Manor NY 10510 United States

ISBN: (纸本)0780389662

In this paper we propose a Directional Routing Protocol (DRP) for MANETs. DRP is an on-demand directional routing protocol which assumes a cross layer interaction between routing and MAC layer. The main features of DRP include an efficient route discovery mechanism, establishment and maintenance of directional routing and directional neighbor tables (DRT and DNT respectively), and novel directional route recovery mechanisms. We have implemented DRP on top of an existing MAC protocol for directional antennas and have compared its performance with the popular dynamic source routing (DSR) protocol over both omni-directional and directional antenna models. Preliminary simulation results are found to be very promising. © 2005 IEEE.

关键词： Network protocols

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A credit-payment scheme for packet forwarding fairness in mobile ad hoc networks

A credit-payment scheme for packet forwarding fairness in mo...

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2005 IEEE International Conference on Communications, ICC 2005

作者： Yoo, Younghwan Ahn, Sanghyun Agrawal, Dharma P. OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH 45221-0030 School of Computer Science University of Seoul Seoul 130-743 Korea Republic of

Routing protocols for mobile ad hoc networks (MANETs) have assumed that all nodes voluntarily participate in forwarding others' packets. This was a reasonable assumption because all nodes in previous MANETs belonged to a single authority. In the near future, however, a MANET may consist of nodes that belong to multiple organizations since various civilian applications are expected to appear. In this situation, mobile nodes may deliberately avoid packet forwarding to save their own energy, resulting in network partition. To make nodes volunteer in packet forwarding we suggest a payment scheme called Protocol-Independent Fairness Algorithm (PIFA). In this type of schemes, nodes need credits to transmit their own packets, and this credit can be earned by forwarding others' packets. PIFA can be utilized irrespective of the type of basic routing protocols, while previous methods are compatible only with source routing like DSR. Simulation results show that PIFA can prevent network partition and network performance degradation due to selfish nodes by inducing them to participate in forwarding packets. © 2005 IEEE.

关键词： Packet networks

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A novel distributed resource-aware scalable scheme for Scatternet formation

A novel distributed resource-aware scalable scheme for Scatt...

引用

IEEE International Conference on Networks

作者： S.I. Dharia D.P. Agrawal OBR Research Center for Distributed and Mobile Computing ECECS University of Cincinnati Cincinnati OH USA

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Lifetime Enhancement of Wireless Sensor Networks by Differentiable Node Density Deployment

Lifetime Enhancement of Wireless Sensor Networks by Differen...

引用

IEEE Internatonal Conference on mobile Adhoc and Sensor Systems (MASS)

作者： Demin Wang Yi Cheng Yun Wang Dharma P. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati USA

A wireless sensor network (WSN) is composed of wireless sensors using batteries with energy constraints, which limits the network lifetime. How to maximize the network lifetime is an important issue in the design of WSNs. We establish a relationship between node density and network lifetime in a periodically data delivery scenario of WSNs with sensors transmitting data to the sink node periodically. Based on our analysis, we propose a sensor node density deployment method that could implement a differential node density in WSNs so that the lifetime of the network could be maximized. Both theoretic analysis and simulation results show that our method outperforms the uniform node distribution method in terms of the network lifetime

关键词： Wireless sensor networks Telecommunication traffic Relays Batteries Traffic control Energy consumption mobile computing Computer networks distributed computing Analytical models

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