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检索条件"机构=OBR Distributed and Mobile Computing"

共 103 条记录，以下是41-50 订阅

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Channel Assignment with Route Discovery (CARD) using Cognitive Radio in Multi-channel Multi-radio Wireless Mesh Networks

Channel Assignment with Route Discovery (CARD) using Cogniti...

引用

IEEE Workshop on Networking Technologies for Software Defined Radio Networks (SDR)

作者： Chittabrata Ghosh Dharma P. Agrawal Department of ECECS University of Cincinnati Cincinnati Ohio USA OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati Ohio - 45219. Email: dpa@ececs.uc.edu

For better spectrum utilization, efficient channel allocation in multi-radio wireless mesh networks has become an active research area. Our proposed CARD algorithm deals with the application of cognitive mesh routers for fixed channel assignments to mesh clients under each router's domain. The farthest channel assignment by the cognitive radio in mesh routers ensures minimum inter-router and intra-router interference. Initial fixed assignment of channels to clients supporting k-connectivity (k = 3 and 5 sub-channels) shows substantial increase with 15 concurrent transmissions when compared to 4 in case of the CCA scheme with k=3 and 3 channels to choose, i.e., a factor of almost 4. The improvement in communication delay is about a factor of 80 when compared to SC and a factor of 35 compared to CCA.

关键词： Cognitive radio Wireless mesh networks Interference Wireless LAN Communication switching Wireless application protocol Access protocols Switches Mesh networks mobile computing

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Mitigating Deafness in Multiple Beamforming Antennas

Mitigating Deafness in Multiple Beamforming Antennas

引用

IEEE Sarnoff Symposium

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

ISBN: (纸本)9781424400027;1424400023

Deafness is considered as a major medium access problem arising due to directional communication in beamforming antennas. In this paper, we provide a novel algorithm for mitigating deafness (AMD) in such antennas. The algorithm extends the directional virtual carrier sensing mechanism by dynamically maintaining parameters for every beam. AMD can easily be implemented with the existing medium access control (MAC) protocols for multiple beamforming antennas. Simulation results show that considerable performance gains can be achieved when the proposed algorithm is employed by the existing MAC schemes.

关键词： Beamforming antennas Deafness Medium access control Wireless ad hoc networks

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Efficient pairwise key establishment and management in static wireless sensor networks

Efficient pairwise key establishment and management in stati...

引用

2nd IEEE International Conference on mobile Ad-hoc and Sensor Systems, MASS 2005

作者： Cheng, Yi Agrawal, Dharma P. OBR Center Distributed and Mobile Computing Lab. University of Cincinnati Cincinnati OH 45221

ISBN: (纸本)0780394666

Key establishment and management is the core of security protocols for wireless sensor networks deployed in the hostile environment. Due to the strict resource constraints, traditional asymmetric key cryptosystems, such as public/private key based schemes, are infeasible for large-scale wireless sensor networks. Research shows that pre-distributing pairwise keys into wireless sensor nodes before deployment is a practical way to deal with the key establishment problem. Existing random key based key pre-distribution schemes only provide probabilistic connectivity of the network and some level of network resilience. In this paper, we propose an efficient pairwise key establishment and management scheme to achieve both network connectivity and resilience for static wireless sensor networks. Compared with current key pre-distribution schemes, our scheme supports large network size, and has lower communication and computational overhead. © 2005 IEEE.

关键词： Wireless telecommunication systems

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A cross-layer approach for efficient flooding in wireless sensor networks

A cross-layer approach for efficient flooding in wireless se...

引用

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

作者： Wang, Xiaodong Yin, Jim Zhang, Qi Agrawal, Dharma P. OBR Center for Distributed and Mobile Computing ECECS University of Cincinnati Cincinnati OH 45221-0030

Due to the high node density and stringent constraint on the energy consumption in wireless sensor networks, designing energy efficient flooding scheme with high reachability is critical for the operation and the lifetime of sensor networks. Many existing flooding approaches address the needs of general ad hoc networks. In contrast, this paper presents a cross-layer approach tailored specifically to the needs of sensor networks. Without assuming location awareness, a novel MAC layer access-deferring scheme based on the received signal power is proposed to reduce the collision possibility and broadcast redundancy. Local neighborhood information is piggybacked in the broadcast packet, and exploited to enhance the reachability. Simulation results show that compared with probabilistic flooding, this scheme has good performance in terms of reachability, average delay and energy efficiency. Moreover, we examine how the range estimation error and neighborhood information inaccuracy introduced by the fading environment affects the performance of our flooding scheme. © 2005 IEEE.

关键词： Wireless telecommunication systems

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distributed data aggregation in sensor networks by regression based compression

Distributed data aggregation in sensor networks by regressio...

引用

2nd IEEE International Conference on mobile Ad-hoc and Sensor Systems, MASS 2005

作者： Banerjee, Torsha Chowdhury, Kaushik Agrawal, Dharma P. IEEE University of Cincinnati OBR Center for Distributed and Mobile Computing Cincinnati OH 45221-0030

ISBN: (纸本)0780394666

In this paper we propose a method for data compression and its subsequent regeneration using a polynomial regression technique. We approximate data received over the considered area by fitting it to a function and communicate this by passing only the coefficients that describe the function. In this paper, we extend our previous algorithm TREG to consider non-complete aggregation trees. The proposed algorithm DUMMYREG is run at each parent node and uses information present in the existing child to construct a complete binary tree. In addition to obtaining values in regions devoid of sensor nodes and reducing communication overhead, this new approach further reduces the error when the readings are regenerated at the sink. Results reveal that for a network density of 0.0025 and a complete binary tree of depth 4, the absolute error is 6%. For a non-complete binary tree, TREG returns an error of 18% while this is reduced to 12% when DUMMYREG is used. © 2005 IEEE.

关键词： Data structures

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Dynamic admission control and QoS for 802.16 wireless MAN

Dynamic admission control and QoS for 802.16 wireless MAN

引用

2005 Wireless Telecommunications Symposium, WTS

作者： Wang, Haitang Li, Wei Agrawal, Dharma P. OBR Center for Distributed and Mobile Computing ECECS University of Cincinnati Cincinnati OH 45221-0030

ISBN: (纸本)0780388569

IEEE 802.16 wireless MAN is expected to revolutionize of the broadband wireless access technology. The grant/request mechanism in IEEE 802.16 MAC povides different Quality of Service (QoS)for different service flows. In the paper, we discuss the QoS issue in IEEE 802.16 wireless MANs and propose an admission control scheme for services defined in the 802.16 specifications. Our proposed scheme provides the highest priority for UGS flows and maximizes the bandwidth utilization by bandwidth borrowing and degradation. We also develop an analytical model to evaluate the svstem performance. Some numerical results are included to provide a better understanding of our scheme. © 2005 IEEE.

关键词： Wireless telecommunication systems

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MDA: An efficient directional MAC scheme for wireless ad hoc networks

MDA: An efficient directional MAC scheme for wireless ad hoc...

引用

GLOBECOM'05: IEEE Global Telecommunications Conference, 2005

作者： Gossain, Hrishikesh Cordeiro, Carlos Agrawal, Dharma P. OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH 45221-0030

ISBN: (纸本)0780394143

This paper addresses the issue of deafness and hidden terminal problem in a mobile Ad Hoc Networks (MANETs) using directional antennas. To minimize these effects, we propose a MAC protocol for directional Antennas (MDA) which employs an enhanced directional network allocation vector (NA V) scheme and, a novel technique of Diametrically Opposite Directions (DOD) transmission of RTS and CTS. We compare MDA with IEEE 802.11 and two recently proposed directional MAC protocols and results show that MDA outperforms these protocols in the majority of scenarios investigated. We also point out that the performance does depend on the network topology and the truffle pattern.

关键词： Network protocols

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Tree based data aggregation in sensor networks using polynomial regression

Tree based data aggregation in sensor networks using polynom...

引用

2005 8th International Conference on Information Fusion, FUSION

作者： Banerjee, Torsha Chowdhury, Kaushik Agrawal, Dharma P. University of Cincinnati OBR Center for Distributed and Mobile Computing Cincinnati OH 45221-0030 United States OBR Center for Distributed and Mobile Computing Department of Electrical and Computer Engineering and Computer Science University of Cincinnati Cincinnati OH 45221-0030 United States

ISBN: (纸本)0780392868

In this paper, we propose a tree based regression algorithm, (TREG) that addresses the problem of data compression in wireless sensor networks. By function approximation based on multivariable polynomial regression and passing only the coefficients returned by the regression function instead of aggregated data, TREG achieves the following goals: (1) the sink can get attribute values in regions devoid of sensor nodes for attribute values that show smooth spatial gradation (2) readings over any portion of the region can be obtained at one time by querying the root instead of flooding those regions, thus incurring significant energy savings. As size of the data packet transmitted from one tree node to another remains constant, the proposed scheme scales well with growing network density. Extensive simulations are performed on real world data to demonstrate the effectiveness of our aggregation algorithm. Results reveal that for a network density of 0.0025, the optimal tree-depth should be 4 in order to restrict the absolute error to less than a threshold of 6%. A data compression ratio of about 0.02 is achieved using our proposed algorithm, which is almost independent of tree depth. © 2005 IEEE.

关键词： Data reduction

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Effects of contention window and packet size on the energy efficiency of wireless local area network

Effects of contention window and packet size on the energy e...

引用

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

作者： Wang, Xiaodong Yin, Jun Agrawal, Dharma P. OBR Center for Distributed and Mobile Computing ECECS University of Cincinnati Cincinnati OH 45221-0030 United States

ISBN: (纸本)0780389662

This paper introduces an analytical model to investigate the energy efficiency of 802.11 distributed coordinated function (DCF). Many factors, such as the number of contending nodes, packet size, contention window, packet transmission collision probability and channel condition, that affect the energy efficiency of 802.11 DCF have been considered. We determine the packet transmission probability by a method simpler than the existing Markov chain model. This paper identifies the tradeoff in choosing packet size to optimize the energy efficiency of DCF in error-prone environments. The effects of contention window and packet size on the energy efficiency are obtained for both DCF basic mode and DCF with four-way handshaking. It is shown that under error-prone environments optimal packet size can improve more on the energy efficiency than optimal contention window. Combining both optimal contention window and optimal packet size can achieve the maximum optimization. To validate our analytical results, we have done extensive simulations, and they seem to match very well with the presented analytical results. © 2005 IEEE.

关键词： Wireless telecommunication systems

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Data-Centric Attribute Allocation and Retrieval (DCAAR) scheme for wireless sensor networks

Data-Centric Attribute Allocation and Retrieval (DCAAR) sche...

引用

2nd IEEE International Conference on mobile Ad-hoc and Sensor Systems, MASS 2005

作者： Biswas, Ratnabali Chowdhury, Kaushik Agrawal, Dharma P. OBR Research Center for Distributed and Mobile Computing Dept. of ECECS University of Cincinnati Cincinnati OH 45221-0030

ISBN: (纸本)0780394666

Wireless sensor networks have enabled information gathering from a large geographical region and present unprecedented opportunities for a broad spectrum of monitoring applications. In this paper, we propose a data-centric storage scheme to determine a distribution of attributes over a large-scale sensor network such that the cost of retrieving data is minimized. We analytically determine the conditions under which the proposed architecture is beneficial and present simulation results to demonstrate the same. To the best of our knowledge, this is the first attempt to determine an allocation of attributes over a sensor network based on the correlations between attributes. © 2005 IEEE.

关键词： Resource allocation

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