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IEEE Workshop on Local and Metropolitan Area Networks (LANMAN)

作者： D. Lal T. Joshi D.P. Agrawal OBR Research Center of Distributed and Mobile Computing ECECS University of Cincinnati Cincinnati OH USA

In our paper, we investigate some MAC layer issues associated with the use of multiple-beam smart antennas at nodes in a distributed wireless ad-hoc network. We propose a transmitter-initiated on-demand MAC protocol that exploits the spatial parallelism in the transmission of packets at a node. We devise two MAC scheduling strategies in the one-hop neighborhood of a node, largest edge first (LEF) and largest degree node first (LDNF), that allow spatial parallelism to be exploited in the transmission as well as reception of packets. Our simulation results indicate that significant gain may be achieved through our scheduling strategies in a one-hop traffic bottleneck.

关键词： Transmitting antennas Intelligent networks Ad hoc networks Optimal scheduling Media Access Protocol Array signal processing mobile antennas Parallel processing Directional antennas Directive antennas

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Mobility of a Base Station for Simultaneous Multiple Events in a Static Wireless Sensor Network

Mobility of a Base Station for Simultaneous Multiple Events ...

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IEEE National Conference on Aerospace and Electronics (NAECON)

作者： Smita Toshniwal Amit Gaur Demin Wang Dharma P. Agrawal OBR Research Center for Distributed and Mobile Computing CS Department University of Cincinnati Cincinnati OH USA

Energy constrained nature and unattended deployment of sensors motivates the need of special techniques for designing reliable wireless sensor networks. Recently many approaches are considering mobile sensor nodes to deal with this problem. But making all the sensors mobile involves more signaling overhead for network maintenance. It is energy efficient to move the base station which has no power limitations. Also, there are many real life applications in which event based approach is more appropriate. In this paper, we propose an adaptive scheme for a mobile base station that moves according to the occurrence of events. We propose two optimization schemes: moving the BS towards the event centroid and moving the BS towards distance based weighted centroid. Simulation results show that moving the base station adaptively significantly prolongs the network lifetime.

关键词： Base stations Wireless sensor networks Monitoring Surveillance Relays Medical services Network topology mobile agents mobile computing Computer networks

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PERD: Polynomial-based Event Region Detection in Wireless Sensor Networks

PERD: Polynomial-based Event Region Detection in Wireless Se...

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IEEE International Conference on Communications (ICC)

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

We propose a polynomial-based scheme that addresses the problem of event region detection (PERD) for wireless sensor networks (WSNs). Nodes of an aggregation tree perform function approximation of the event using multivariate polynomial regression. Only the coefficients of this polynomial are then transmitted up the tree instead of aggregated data. PERD includes two components: event recognition and event report with boundary detection. In addition, PERD is capable of detecting single event or multiple events simultaneously occurring in the WSN. Since PERD is implemented over a polynomial tree on a WSN in a distributed manner, it is easily scalable and computation overhead is very light. Results reveal that event(s) can be detected by PERD with error in detection remaining almost constant achieving a percentage error within a threshold of 10% with increase in communication range.

关键词： Polynomials Event detection Wireless sensor networks Sensor phenomena and characterization distributed computing Spatiotemporal phenomena Collaboration Image edge detection Function approximation Communications Society

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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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Differentiated Service Classes over Multiple Beam Antennas

Differentiated Service Classes over Multiple Beam Antennas

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Consumer Communications and Networking Conference, CCNC IEEE

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

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On-demand reliable medium access in sensor networks

On-demand reliable medium access in sensor networks

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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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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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An enhanced and energy efficient communication architecture for Bluetooth wireless PANs

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Ad Hoc Networks 2005年第2期3卷 119-140页

作者： Cordeiro, Carlos De M. Abhyankar, Sachin Agrawal, Dharma P. Networking Technologies Lab. Nokia Research Center Tampere Finland Qualcomm Incorporated San Diego CA United States OBR Ctr. Distributed Mobile Comp. Department of ECECS University of Cincinnati Cincinnati OH United States

Bluetooth is a radio technology for Wireless Personal Area Networking (WPAN) operating in the 2.4 GHz ISM frequency band, and allows devices to be connected into short-range ad hoc networks. The Bluetooth medium access control protocol is based on the Master/Slave paradigm wherein any communication between slave devices has to go through the Master. While this model provides for simplicity, it incurs a longer delay between any two slave devices due to far from optimal packet forwarding, the use of double the bandwidth, and also additional energy wastage at the Master. Moreover, if more than two devices want to communicate as a group, this can only be achieved by either multiple unicast transmissions or a piconet-wide broadcast, clearly resulting in inefficiency. In this paper, we propose a novel Dynamic Slot Assignment (DSA) scheme whereby the Master device dynamically assigns slots to Slaves so as to allow them to communicate directly with each other without any Master intervention. This proposed communication architecture also provides for Quality of Service (QoS) requests, admission control, and multi-device conversation by which a multicast-like communication is implemented within a piconet. Through extensive simulation, we observe that DSA drastically enhances Bluetooth performance in terms of delay and throughput, while significantly reducing power consumption at the master and the overall piconet. © 2004 Elsevier B.V. All rights reserved.

关键词： Radio systems

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A novel priority based scheduling scheme for ad hoc networks

A novel priority based scheduling scheme for ad hoc networks

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IEEE Conference on Vehicular Technology (VTC)

作者： Jun Yin Qing-An Zeng D.P. Agrawal OBR center for Distributed and mobile computing ECECS University of Cincinnati Cincinnati OH USA

Since ad hoc networks provide users convenient access to information anytime anywhere, they have many applications. However, scheduling packet based on assigned priority is challenging. This paper presents design and analysis of a priority request to send (RTS) packet scheduling (PRPS), a distributed MAC protocol which can ensure priority based packet scheduling for multiple traffic flows when different priority classes of traffic are present. For PRPS, nodes send their requests in a contention period and send data packets in a contention-free period and a state transition mechanism supports a change between contention and contention-free phases. An analytical model is introduced to determine the system performance when the traffic is in saturated region. The results of PRPS are compared with that of the IEEE 802.11 standard. Extensive simulations indicate that the system performances such as throughput and the average delay etc, are improved with respect to the IEEE 802.11 distributed coordination function (DCF).

关键词： Ad hoc networks Scheduling algorithm Delay Media Access Protocol Access protocols Traffic control Quality of service Processor scheduling Throughput Multiaccess communication

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