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Concurrent packet reception bounds of on-demand MAC protocols for multiple beam antennas

Concurrent packet reception bounds of on-demand MAC protocol...

引用

2006 IEEE 17th International Symposium on Personal, Indoor and mobile Radio Communications, PIMRC

作者： Jain, Vivek Agrawal, Dharma P. OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH 45221 United States

ISBN: (纸本)1424403294

Multiple beam antennas can initiate several data communications concurrently by forming spatially separable beams. However, their concurrent packet reception (CPR) capability is largely governed by the underlying medium access control (MAC) protocol. In this paper, we present an analytical framework to calculate CPR upper bounds of multiple beam antennas using on-demand MAC protocols. The model can be used for adaptively changing transmission probability of the nodes so as to achieve optimal performance. We consider both transmitter-initiated and receiver initiated medium access protocols with uniform and random distribution of nodes. Using the developed model, we compute CPR capability of IEEE 802.11 DCF and ESIF based mechanisms for multiple beam antennas. We verify our model using simulations. © 2006 IEEE.

关键词： Medium access control

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Attribute allocation and retrieval scheme for large-scale sensor networks

Attribute allocation and retrieval scheme for large-scale se...

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

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. 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. © Springer Science+Business Media, LLC 2006.

关键词： Wireless telecommunication systems

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Improved Pairwise Key Establishment for Wireless Sensor Networks

Improved Pairwise Key Establishment for Wireless Sensor Netw...

引用

IEEE International Conference on Wireless and mobile computing, Networking And Communications (WiMob)

作者： Yi Cheng D.P. Agrawal OBR Center for Distributed and Mobile Computing Laboratory University of Cincinnati Cincinnati OH USA

Due to the resource constraints, pre-distributing secret keys into sensor nodes before they are deployed is an applicable approach to achieve information security in wireless sensor networks. Several key pre-distribution schemes have been proposed in literature to establish pairwise keys between sensor nodes; they are either too complicated, or insecure for some common attacks. To address these weaknesses, we propose an improved pairwise key establishment mechanism for wireless sensor networks in this paper. Compared with existing approaches, our scheme has better network resilience against node capture attack. Analysis and simulation results show that our scheme performs better than earlier proposed schemes in terms of network connectivity, key storage overhead, maximum supported network size, computational and communication overheads

关键词： Wireless sensor networks Cryptography Sensor phenomena and characterization Computer networks Data security Resilience Data processing Public key Authentication distributed computing

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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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Localization Algorithm using Expected Hop Progress in Wireless Sensor Networks

Localization Algorithm using Expected Hop Progress in Wirele...

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

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

In this paper, we propose a novel localization algorithm using expected hop progress (LAEP) to predict the positions of sensor nodes in WSNs. Our algorithm is based on a hop progress analytical model for a given network topology. By deriving relationship between node connectivity and expected-hop progress from the model, the distance between any two nodes can be accurately computed. As the distance estimation is a key issue in positioning system of WSNs, our expected-hop progress based localization algorithm also achieves reasonable performance in anchor-based WSNs with very few anchors. In addition, we considered the impact of deterministic anchor placement on the algorithm performance when the sensors are random deployed. Both grid and triangular placement of anchor nodes have been examined in this paper. Simulation results are seen to be in good agreement with the theoretical analysis and substantiate the validity of our proposed scheme LAEP

关键词： Wireless sensor networks Analytical models Network topology Sensor phenomena and characterization Algorithm design and analysis mobile computing Computer networks distributed computing Monitoring Surveillance

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Wireless Sensor based Dynamic Channel Selection in Cellular Communication by Cognitive Radio Approach

Wireless Sensor based Dynamic Channel Selection in Cellular ...

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International Conference on Cognitive Radio Oriented Wireless Networks and Communications

作者： Torsha Banerjee Chittabrata Ghosh Dharma P. Agrawal OBR Center for Distributed and Mobile Computing University of Cincinnati Cincinnati OH USA

ISBN: (纸本)1424413804

In a cellular communication scenario, wireless sensors can be deployed to sense the interference power of the frequency band. In an ideal channel, interference temperature (IT) which is directly proportional to the interference power can be assumed to vary spatially with the frequency of the sub channel. We propose a scheme for approximating ITs over an extended C-band (licensed and unused television band) by fitting sub channel frequencies and corresponding ITs to a regression model. Using this model, IT of a random sub channel can be calculated by the base station (BS) for further analysis of the channel interference. Our proposed model based on readings reported by sensors helps in dynamic channel selection (S-DCS) in extended C-band for assignment to unlicensed secondary users. S-DCS maximizes channel utilization and proves to be economic from energy consumption point of view. It also exhibits substantial amount of accuracy with error bound within 6.8%. Again, users are assigned empty sub channels without actually probing them, incurring minimum delay in the process. Overall channel allocation efficiency is also maximized along with fairness to individual users

关键词： Wireless sensor networks Cognitive radio Interference Frequency Wireless communication Temperature sensors TV Base stations Power generation economics Energy consumption

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On-demand reliable medium access in sensor networks

On-demand reliable medium access in sensor networks

引用

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

作者： R. Biswas V. Jain C. Ghosh D.P. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati USA

A wireless sensor network typically consists of a dense deployment of sensor nodes to achieve higher resolution and better network coverage. Having a dense network increases the fault-tolerance and robustness of the system. However, if not properly handled, it can lead to more collisions during transmission and also network congestion. Furthermore, wireless communication is inherently unpredictable and error-prone. Hence, it is imperative to design an efficient medium access control (MAC) protocol that facilitates guaranteed delivery of data over unreliable wireless links. In this paper, we have designed an on-demand reliable MAC (RMAC) protocol that enables timely delivery of data. We have demonstrated its superior performance over existing reliability-enforcing approaches in terms of reliability, latency, scalability and energy-efficiency

关键词： Media Access Protocol Wireless sensor networks Access protocols Fault tolerant systems Robustness Wireless communication Wireless application protocol Telecommunication network reliability Delay Scalability

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CMAC - A multi-channel energy efficient MAC for wireless sensor networks

CMAC - A multi-channel energy efficient MAC for wireless sen...

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IEEE Conference on Wireless Communications and Networking

作者： K.R. Chowdhury N. Nandiraju D. Cavalcanti D.P. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati OH USA

Tins paper presents CMAC, a fully desynchronized MAC protocol that is designed to exploit the existing multi-channel support in sensor nodes. The hardware requirements of our protocol are minimal, requiring a single half-duplex transceiver and a low-power wake-up radio. CMAC takes into account the fundamental energy constraint in sensor nodes by placing them in a default sleep mode and waking them up only when necessary. As a contrast to other dual radio wake-up schemes, our protocol focuses on how communication and its preceding control message exchange mechanism can be undertaken in a multi-channel scenario without assuming a separate control channel. CMAC enables spatial channel re-use, nearly collision free communication, and addresses the deafness problem without incurring a tradeoff in fairness or latency. When compared with a recent MAC protocol SMAC, results show that CMAC obtains nearly 200% reduction in energy consumption, significantly improved throughput, and end-to-end delay values that are 50-150% better than SMAC for our simulated topologies

关键词： Energy efficiency Wireless sensor networks Media Access Protocol Radio control Communication system control Delay Tin Hardware Transceivers Deafness

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Analytical Modeling of the Link Delay Characteristics for IEEE 802.11 DCF Multi-Rate WLANs

Analytical Modeling of the Link Delay Characteristics for IE...

引用

Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： Tarun Joshi Anindo Mukherjee Dharma P Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA

Performance evaluation of IEEE 802.11 DCF has been widely studied under the assumption of a single transmission rate by all competing nodes. In practice, however, stations typically use different transmission rates. This is done to match to the changing channel conditions. Stations with poor channel conditions typically employ lower transmit rates in comparison to stations with better channel conditions. Under such scenarios, the throughput of each station becomes independent of its own transmit rate; rather it gets bounded by the slowest transmitting peer. This has been popularly classified as the performance anomaly problem. This paper provides a simple yet accurate analytical framework to study the link delay characteristics of such multi-rate networks

关键词： Analytical models Delay Throughput Peer to peer computing Counting circuits Performance analysis Monitoring Space stations Collision avoidance mobile computing

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Concurrent Packet Reception Bounds of On-Demand MAC Protocols for Multiple Beam Antennas

Concurrent Packet Reception Bounds of On-Demand MAC Protocol...

引用

IEEE International Symposium on Personal, Indoor and mobile Radio Communications (PIMRC)

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

关键词： Media Access Protocol Directional antennas Access protocols Scheduling Antenna arrays Data communication Upper bound Ad hoc networks Transmitting antennas Transmitters

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