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Energy-Efficient and Reliable Medium Access in Sensor Networks

Energy-Efficient and Reliable Medium Access in Sensor Networ...

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IEEE International Symposium on World of Wireless mobile and Multimedia Networks (WoWMoM)

作者： Vivek Jain Ratnabali Biswas Dharma P. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati USA

Energy efficiency and reliable data delivery are the two most important parameters for designing wireless sensor network protocols. Wireless communication is inherently unpredictable and error-prone. Hence, reliability is required to ensure that a packet reaches its desired destination; otherwise the energy expended in forwarding the packet is wasted On the other hand, energy-saving mechanisms are required for battery-constrained sensor networks. In this paper, we have designed an on-demand energy-efficient and reliable medium access control (E2RM: AC) protocol that enables reliable data delivery and energy conservation without affecting packet latency. We have demonstrated the superior performance of E2RMAC over existing energy-efficient and reliability-enforcing approaches in terms of reliability, latency, scalability and energy-efficiency.

关键词： Energy efficiency Telecommunication network reliability Access protocols Delay Wireless sensor networks Wireless application protocol Wireless communication Media Access Protocol Energy conservation Scalability

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Efficient mesh router placement in wireless mesh networks

Efficient mesh router placement in wireless mesh networks

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2007 IEEE Internatonal Conference on mobile Adhoc and Sensor Systems, MASS

作者： Wang, Junfang Xie, Bin Cai, Kan Agrawal, Dharma P. OBR Center of Distributed and Mobile Computing Department of Computer Science University of Cincinnati Cincinnati OH 45221-0030 United States Department of Computer Science University of British Columbia Vancouver BC Canada

ISBN: (纸本)1424414555

The placement of mesh routers (MRs) in building a wireless mesh network (WMN) is the first step to ensure the desired network performance. Given a network domain, the fundamental issue in placing MRs is to find the minimal configuration of MRs so as to satisfy the network coverage, connectivity, and Internet traffic demand. In this paper, the problem is addressed under a constraint network model in which the traffic demand is non-uniformly distributed and the candidate positions for MRs are pre-decided. After formulating the MR placement problem, we first provide the theoretical analysis to validate the traffic demand and determine the optimal position of Internet gateway (IGW). To reduce complexity of determining the locations of MRs while satisfying the traffic constraint, we propose an effective heuristic algorithm to obtain an close-to-optimal solution. Finally, our simulation results verify our analytical model and show the effectiveness of our proposed algorithm. ©2007 IEEE.

关键词： Heuristic algorithms

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LIMOC: Enhancing the Lifetime of a Sensor Network with mobile Clusterheads

LIMOC: Enhancing the Lifetime of a Sensor Network with Mobil...

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IEEE Conference on Vehicular Technology (VTC)

作者： Torsha Banerjee Bin Xie Jung Hyun Jun Dharma P. Agrawal OBR Center for Distributed and Mobile Computing University of Cincinnati Cincinnati OH USA

This paper proposes a scheme for enhancement of network Lifetime using mobile Clusterheads (LIMOC) in a wireless sensor network (WSN). The low energy, static sensor nodes sense physical parameters and route the data to the highly energy-rich nodes called ClusterHeads (CHs) which are mobile and can transmit data directly to the base station (BS). A collaborative strategy among the CHs increases the lifetime (hence residual energy) of the network further. Simulation has shown that residual energy of the network can be improved by 45% by making the CHs always move towards the event in an event-driven network. For general cases, increased energy savings is obtained by making the CH move towards the center of equilibrium w.r.t. to both the total residual energy and data flow of the network.

关键词： Wireless sensor networks mobile computing Collaboration Relays Routing Computer networks distributed computing Base stations Discrete event simulation Decision making

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Active Cache Based Defense against DoS Attacks in Wireless Mesh Network

Active Cache Based Defense against DoS Attacks in Wireless M...

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International Symposium on Wireless Pervasive computing (ISWPC)

作者： Lakshmi Santhanam Deepti Nandiraju Nagesh Nandiraju Dharma P. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA

Wireless mesh network (WMN) is evolving to be a new paradigm for wireless Internet connectivity as it obviates the need for wired infrastructure at every access point (AP) a.k.a mesh router (MR). The MRs collaboratively forward the traffic towards the Internet gateway (IGW). The self-configurable architecture of MRs paves way for malicious intruders to conduct a denial-of-service attack (DoS) on the MRs by flooding the network with a large volume of traffic; thus rendering the system inaccessible to the real users. In this paper, we present a cache based defense at the MRs to identify flooding style DoS attacks. We use a most frequently used cache mechanism to identify such flows and raise an early alert to curb them. We effectively avert any performance degradation by dropping the identified attack flows along the forwarding routers. Simulation results indicate that our scheme offers an active line of defense against DoS attacks

关键词： Computer crime Wireless mesh networks Telecommunication traffic Internet Spine Floods Degradation Traffic control Bandwidth Spread spectrum communication

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Exploiting Spatial Correlation in a three dimensional Wireless Sensor Network

Exploiting Spatial Correlation in a three dimensional Wirele...

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

作者： Anurag Sharma Torsha Banerjee Dharma P. Agrawal OBR Center for Distributed and Mobile Computing Department of Computer Science University of Cincinnati Cincinnati OH USA

Physical attributes such as temperature exhibit gradual change in value with space. Observations from the sensor nodes are thus highly correlated. In this paper, we propose a scheme to exploit the spatial correlation of data in a three dimensional wireless sensor network (WSN), in a way so as to reduce the number of transmissions in the network, thereby saving energy. The presented work is an extension of the earlier proposed TREG scheme which is only applicable to two dimensional WSN. Our scheme involves formation of binary tree and transmission of data along the tree nodes. Simulation has been carried out for different tree heights. Simulation results show that a tree height of four provides results with optimal values.

关键词： Wireless sensor networks Sensor phenomena and characterization Intelligent sensors Temperature sensors Batteries Costs Protocols Energy consumption mobile computing Computer networks

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Achieving Fault Tolerance in Data Aggregation in Wireless Sensor Networks

Achieving Fault Tolerance in Data Aggregation in Wireless Se...

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IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference

作者： Torsha Banerjee Bin Xie Dharma P. Agrawal OBR Center for Distributed and Mobile Computing Department of Computer Science University of Cincinnati Cincinnati OH USA

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.

关键词： Fault tolerance Wireless sensor networks Sensor phenomena and characterization Fault detection Fault diagnosis Polynomials Delay estimation mobile computing Computer networks distributed computing

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Optimizing the Internet Gateway Deployment in a Wireless Mesh Network

Optimizing the Internet Gateway Deployment in a Wireless Mes...

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

作者： Bing He Bin Xie Dharma P. Agrawal OBR Center of Distributed and Mobile Computing Department of Computer Science University of Cincinnati Cincinnati OH USA

In a wireless mesh network (WMN), mesh routers (MRs) are interconnected by wireless links and form a wireless backbone to provide ubiquitous high-speed Internet connectivity for mobile clients. The wireless backbone is tightly integrated with the Internet by nodes called as Internet gateways (IGWs). In this paper, we address the IGW deployment problem which is shown to be NP-hard. We first formulate it as a linear program (LP) issue, then develop two heuristic algorithms for the purpose of cost-efficient IGW deployment. We further compare our algorithms with a leading approach by extensive simulations. Our analysis shows the effectiveness of the proposed algorithms.

关键词： IP networks Wireless mesh networks Internet Spine Throughput mobile computing Protocols Telecommunication traffic Tree graphs Spread spectrum communication

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Optimal Transmission Range with Delay Constraints for Homogeneous MANETs

Optimal Transmission Range with Delay Constraints for Homoge...

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IEEE International Symposium on World of Wireless mobile and Multimedia Networks (WoWMoM)

作者： Younghwan Yoo Dharma P. Agrawal School of Computer Science and Engineering Pusan National University South Korea OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA

In a wireless ad hoc networks where all mobile nodes (MNs) have the same transmission range and the MN density is sufficiently high, the actual hop count between any two MNs is proportional to the distance between them. This paper shows the relation between distance and hop count first. Then, based on the relation, the required hop count between two given MNs is estimated. With the distribution of distance between pairs of MNs, this paper also suggests the optimal transmission power of MNs, which can guarantee delay constraints of a requested ratio of connections in an entire network. All problems are investigated in both a two-dimensional and a three-dimensional area. Simulation results substantiate the accuracy of the proposed approximation methods. The errors of the hop count estimation method are just 0.88% and 2.33% in a 2D and 3D area.

关键词： Delay mobile computing distributed computing mobile ad hoc networks Wireless sensor networks Computer science Computer networks Approximation methods Energy efficiency Computational modeling

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Design of a Medium Access Control Protocol for Dynamic Spectrum Access Networks

Design of a Medium Access Control Protocol for Dynamic Spect...

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IEEE International Conference on Communications (ICC)

作者： A. Mishra D. P. Agrawal Bradley Department of Electrical And Computer Engineering Virginia Polytechnic Institute and State University USA OBR Center for Distributed & Mobile Computing Department of ECECS University of Cincinnati USA

In this paper we present a design of a medium access control protocol that allows the utilization of unused licensed spectrum of deployed wireless cellular systems (Primary System) by an overlaid multi-hop ad hoc network (Secondary System). The basic design principle is that the secondary operates in a non-intrusive manner and does not interact with the primary. We address a number of architectural challenges pertinent to this networking environment, and evaluate the performance of the MAC. Our performance evaluation results show that, in a single-hop ad hoc network, the proposed MAC transparently utilizes 75% of the bandwidth left unused by the primary, while, in the multi-hop cases, due to spatial reuse, the bandwidth utilization can be significantly higher.

关键词： Media Access Protocol Access protocols GSM Spread spectrum communication Bandwidth Ad hoc networks Wireless application protocol Communications Society Wireless cellular systems mobile computing

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Efficient Mesh Router Placement in Wireless Mesh Networks

Efficient Mesh Router Placement in Wireless Mesh Networks

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

作者： Junfang Wang Bin Xie Kan Cai Dharma P. Agrawal OBR Center of Distributed and Mobile Computing Department of Computer Science University of Cincinnati Cincinnati OH USA Department of Computer Science University of British Columbia Vancouver BC Canada

关键词： Wireless mesh networks Traffic control Telecommunication traffic Internet Throughput Computer science Heuristic algorithms Analytical models Interference constraints Costs

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