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

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IEEE 802.11 DCF based MAC protocols for multiple beam antennas and their limitations

IEEE 802.11 DCF based MAC protocols for multiple beam antenn...

引用

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

作者： Jain, Vivek Gupta, Anurag Lalf, Dhananjay Agrawal, Dharma P. OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Research and Technology Center Robert Bosch Corporation

ISBN: (纸本)0780394666

Multiple beam antennas can receive (or transmit) data on multiple beams simultaneously. The aim of this paper is to show the limitations of using IEEE 802.11 distributed coordination function (DCF) based schemes for medium access control (MAC) in such antennas. We provide four different variants of IEEE 802.11 DCF based on-demand protocols to study this phenomenon. Our simulation results and analyses emphasize the need to develop a novel MAC protocol to fully exploit the capabilities of multiple beam antennas. We further provide some embryonic guidelines for the development of such a protocol. © 2005 IEEE.

关键词： Network protocols

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Energy aware routing for spatio-temporal queries in sensor networks

Energy aware routing for spatio-temporal queries in sensor n...

引用

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

作者： Jain, Neha Biswas, Ratnabali Nandiraju, Nagesh Agrawal, Dharma P. OBR Research Center for Distributed and Mobile Computing ECECS Department University of Cincinnati Cincinnati OH 45221-0030 United States

ISBN: (纸本)0780389662

Wireless sensor networks is an emerging technology that can significantly improve the quality of spatio-temporal data monitoring because of their untethered operation and potential for large scale deployment. In this paper, we define a communication architecture that supports distributed query processing to evaluate spatio-temporal queries within the network. We represent these queries by query trees and distribute query operators to appropriate sensor nodes. As operator execution demands high computation capability, we propose use of a heterogenous sensor network where query operators are assigned to sparsely deployed resource-rich nodes within a dense network of low power sensor nodes. We design an adaptive, decentralized, low communication overhead algorithm to determine an operator placement on the resource-rich nodes in the network to minimize cost of transmitting data along a routing tree constructed to continuously retrieve data at the sink, from a set of spatially distributed geographical regions. To the best of our knowledge, this is the first attempt to build an energy aware routing infrastructure to enable in-network processing of spatio-temporal queries. © 2005 IEEE.

关键词： Routers

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A cross layer MAC with explicit synchronization through intelligent feedback for multiple beam antennas

A cross layer MAC with explicit synchronization through inte...

引用

GLOBECOM'05: IEEE Global Telecommunications Conference, 2005

作者： Jain, Vivek Gupta, Anurag Lal, Dhananjay Agrawal, Dharma P. OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Research and Technology Center Robert Bosch Corporation

ISBN: (纸本)0780394143

This paper introduces a novel cross layer medium access control protocol for multiple beam antennas to fully utilize their multiple-beam-forming capability. Our protocol, Explicit Synchronization via Intelligent Feedback (ESIF), uses feedback from neighboring nodes to synchronize data communication at multiple beams. ESIF exploits routing information to guarantee long-term fairness and minimize the energy and latency overheads. Unlike previous works on directional antennas that discuss range extension, we focus on optimal spatial reuse. Simulation results demonstrate that ESIF outperforms other ondemand access schemes based on IEEE 802.11 DCF for multiple beam antennas.

关键词： Antenna arrays

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Attribute allocation in large scale sensor networks 05

Attribute allocation in large scale sensor networks

引用

2nd International Workshop on Data Management for Sensor Networks, DMSN 2005, Held in Conjunction with Very Large Data Bases

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 United States

ISBN: (纸本)1595932062

Wireless sensor network is an emerging technology that enables remote monitoring of large geographical regions. In this paper, we address the problem of distributing attributes over such a large-scale sensor network so that the cost of data retrieval is minimized. The proposed scheme is a data-centric storage scheme where the attributes are distributed over the network depending on the correlations between them. The problem addressed here is similar to the Allocation Problem of distributed databases. In this paper, we have defined the Allocation Problem in the context of sensor networks and have proposed a scheme for finding a good distribution of attributes to the sensor network. We also propose an architecture for query processing given such a distribution of attributes. Finally, we present simulations results to illustrate the conditions under which our proposed architecture is beneficial. To the best of our knowledge, this is the first attempt to study the attribute allocation problem of distributed databases in the context of sensor networks. Copyright 2005 ACM.

关键词： Geographical regions

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

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

引用

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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Tree based data aggregation in sensor networks using polynomial regression

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

引用

International Conference on Information Fusion

作者： T. Banerjee K. Chowdhury D.P. Agrawal OBR Center for Distributed and Mobile Computing University of Cincinnati Cincinnati OH USA

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.

关键词： Intelligent networks Polynomials Regression tree analysis Function approximation Data compression Binary trees mobile computing distributed computing Wireless sensor networks Sensor phenomena and characterization

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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

IEEE Conference on Wireless Communications and Networking

作者： Xiaodong Wang Jun Yin D.P. Agrawal OBR center for Distributed and mobile computing ECECS University of Cincinnati Cincinnati OH USA

The paper introduces an analytical model to investigate the energy efficiency of the IEEE 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. The 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.

关键词： Energy efficiency Wireless LAN Analytical models Batteries Throughput Power control Protocols Multiaccess communication Performance analysis Delay

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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

Wireless Telecommunications Symposium, WTS

作者： H. Wang W. Li D.P. Agrawal OBR Center for Distributed and Mobile Computing ECECS University of Cincinnati Cincinnati OH USA

IEEE 802.16 wireless MAN is expected to revolutionize of the broadband wireless access technology. The grant/request mechanism in IEEE 802.16 MAC provides 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 system performance. Some numerical results are included to provide a better understanding of our scheme.

关键词： Admission control Bandwidth Quality of service Control systems Wireless LAN Broadband antennas Wireless networks mobile computing distributed computing System performance

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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

IEEE Conference on Wireless Communications and Networking

作者： Xiaodong Wang Jun Yin Qi Zhang D.P. Agrawal OBR Center for Distributed and Mobile Computing ECECS University of Cincinnati Cincinnati OH USA

Due to the high node density and stringent constraints on the energy consumption in wireless sensor networks, designing an 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 onto 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.

关键词： Wireless sensor networks Energy efficiency Broadcasting Floods Energy consumption Ad hoc networks mobile radio mobility management Redundancy Delay Estimation error

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