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WSN03-5: Load-balancing and Inter-domain Mobility for Wireless Mesh Networks

WSN03-5: Load-balancing and Inter-domain Mobility for Wirele...

引用

IEEE Globecom 2006

作者： Bin Xie Yingbing Yu Anup Kumar Dharma Parkash Agrawal Computer Engineering and Computer Science Dept University of Louisville Louisville KY USA Division of Natural and Mathematical Sciences LeMoyne-Owen College Memphis TN USA Center for Distributed and Mobile Com Department of ECECS University of Cincinnati Cincinnati OH USA

This paper proposes a scheme for domain partition to achieve the tradeoff between load-balancing and inter-domain mobility to reduce the negative impact of the host mobility. The load-balancing scheme for domains includes: an initialization procedure to divide a mesh network into domains, and a load adjustment procedure to rebalance the traffic load of neighboring domains when required. Moreover, the proposed scheme provides inter-domain mobility in support of multi-hop communication with the multi-hop cellular IP (MCIP) mobility protocol. Our experimental results show that the proposed protocol effectively controls the migration of mesh routers as well as mobile stations.

关键词： Wireless mesh networks Mesh networks IP networks Telecommunication traffic Spread spectrum communication Internet Spine Computer networks Protocols mobile ad hoc networks

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Energy efficiency evaluation of wireless LAN over bursty error channel

Energy efficiency evaluation of wireless LAN over bursty err...

引用

GLOBECOM'05: IEEE Global Telecommunications Conference, 2005

作者： Yin, Jun Wang, Xiaodong Agrawal, Dharma P. Center of Distributed and Mobile Computing Department of ECECS Univ. of Cincinnati

ISBN: (纸本)0780394143

This paper evaluates the energy efficiency of the IEEE 802.11 distributed coordinated function (DCF) over bursty error channel. Most existing works in the literature assume ideal channel or a simple uniform error model. These existing analysis can hardly capture the impact of fading on the energy efficiency accurately. In this paper, a Markov channel model is adopted, and the impact of bursty channel errors is characterized to obtain the energy efficiency of DCF. In our analysis, many factors that affect the energy efficiency of 802.11 DCF have been considered. Simulations in ns-2 are also performed to validate the analysis. © 2005 IEEE.

关键词： Local area networks

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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...

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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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Minimizing re-authentication overheads in infrastructure IEEE 802.11 WLAN networks

Minimizing re-authentication overheads in infrastructure IEE...

引用

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

作者： Mukherjee, Anindo Joshi, Tarun Agrawal, Dharma P. Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH 45221-0030 United States

ISBN: (纸本)0780389662

Authentication delays of the order of 1s are a severe bottleneck in maintaining QoS guarantees over WLANs. Preauthentication schemes have been proposed to reduce these delays. However, most of these schemes suffer from an increased message overhead on the network. The primary reason for this is that mobility modeling is not on a per-user basis. In this paper, we exploit the notion of predictability in user mobility patterns and propose a set of novel proactive key distribution algorithms to achieve low latencies while minimizing the message overhead in the network. We further provide a model to measure the responsiveness of our schemes to randomness in user motion. Simulation results indicate up to 60% message reduction in comparison to existing schemes, while maintaining similar latency values. © 2005 IEEE.

关键词： Telecommunication networks

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

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

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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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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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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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Energy aware routing for spatio-temporal queries in sensor networks

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

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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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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...

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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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