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Mitigating the effects of intermittent interference on Bluetooth ad hoc networks

Mitigating the effects of intermittent interference on Bluet...

引用

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

作者： C. de M Cordeiro D.P. Agrawal Center for Distributed and Mobile Computing ECECS University of Cincinnati Cincinnati OH USA

Bluetooth is a promising wireless technology aiming at supporting electronic devices to be instantly interconnected into short-range ad hoc networks. Previous studies show that since Bluetooth operates in the unlicensed 2.45 GHz frequency band, the presence of multiple piconets in the vicinity creates intermittent interference on signal reception which, in turn, degrades the overall throughput of the network. In order to cope up with this interference source, this paper proposes a sophisticated interference aware Bluetooth segmentation algorithm (IBLUES), where Bluetooth packet types are selected depending on the packet success probability, which is calculated based on the interference generated by multiple piconets. Among other things, we show that when the number of bridge nodes are larger than five the propagation delay between piconets increases rapidly. We have also observed a drastic overhead in the current Bluetooth piconet switching procedure and conclude that future enhancements to this procedure are crucial to efficiency of Bluetooth-based ad hoc networking.

关键词： Interference Bluetooth Ad hoc networks Personal area networks Frequency Degradation Throughput Probability Bridges Propagation delay

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TEEN: A routing protocol for enhanced efficiency in wireless sensor networks 15

TEEN: A routing protocol for enhanced efficiency in wireless...

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15th International Parallel and distributed Processing Symposium, IPDPS 2001

作者： Manjeshwar, A. Agrawal, D.P. Center for Distributed and Mobile Computing ECECS Department University of Cincinnati CincinnatiOH45221-0030 United States

ISBN: (纸本)0769509908

Wireless sensor networks are expected to find wide applicability and increasing deployment in the near future. In this paper, we propose a formal classification of sensor networks, based on their mode of functioning, as proactive and reactive networks. Reactive networks, as opposed to passive data collecting proactive networks, respond immediately to changes in the relevant parameters of interest. We also introduce a new energy efficient protocol, TEEN (Threshold sensitive Energy Efficient sensor Network protocol) for reactive networks. We evaluate the performance of our protocol for a simple temperature sensing application. In terms of energy efficiency, our protocol has been observed to outperform existing conventional sensor network protocols. © 2001 IEEE.

关键词： Wireless sensor networks

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TEEN: a routing protocol for enhanced efficiency in wireless sensor networks

TEEN: a routing protocol for enhanced efficiency in wireless...

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International Symposium on Parallel and distributed Processing (IPDPS)

作者： A. Manjeshwar D.P. Agrawal Center for Distributed and Mobile Computing ECECS Department University of Cincinnati Cincinnati OH USA

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Modeling and analysis of preemptive priority based handoffs in integrated wireless mobile networks

Modeling and analysis of preemptive priority based handoffs ...

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IEEE Conference on Vehicular Technology (VTC)

作者： Qing-An Zeng D.P. Agrawal Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA

In this paper, we propose an analytical modeling for integrated wireless networks with priority reservation and preemptive priority procedures. In our scheme, calls are separated into four different classes: originating voice calls, originating data calls, voice and data handoff request calls. In the proposed scheme, there are queues for handoff request calls. Some number of channels in each cell are reserved exclusively for handoff request calls. Out of this number of channels, some are reserved exclusively for voice handoff requests. The remaining channels are shared by both originating and handoff request calls. Higher priority is given to voice handoff requests over data handoff requests and can preempt the service of ongoing data calls if on arrival it finds no free channels. A three-dimensional Markov chain model is used to determine system performance in terms of blocking probabilities of originating calls, forced termination probability of voice handoff requests calls, and average transmission delay of data calls.

关键词： Intelligent networks Quality of service Real time systems mobile computing Microcell networks Traffic control Computer networks distributed computing Analytical models Wireless networks

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Recent advances in wireless networking

Recent advances in wireless networking

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International Conference on Parallel Processing Workshops (ICPPW)

作者： D.P. Agrawal Center for Distributed and Mobile Computing ECECS Department University of Cincinnati Cincinnati OH USA

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Modeling of handoffs and performance analysis of wireless data networks

Modeling of handoffs and performance analysis of wireless da...

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International Conference on Parallel Processing Workshops, ICPPW 2001

作者： Zeng, Qing-An Agrawal, D.P. Center for Distributed and Mobile Computing Department of Electrical and Computer Engineering and Computer Science University of Cincinnati OH45221-0030 United States

ISBN: (纸本)0769512607

In this paper, we introduce a handoff scheme for data mobile cellular radio systems. A steady-stale traffic model is established and an analytical model of the system performance is presented. Average queue length and transmission delay are evaluated. Although mobile users holding channels move from one cell to another, there is almost no packet loss except for the negligibly small blocking probability because a channel request can be transferred from the queue of one base station to another. © 2001 IEEE.

关键词： Quality of service

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Modeling and evaluation of Bluetooth MAC protocol

Modeling and evaluation of Bluetooth MAC protocol

引用

International Conference on Computer Communications and Networks (ICCCN)

作者： C. de Morais Cordeiro D. Sadok D.P. Agrawal Centro Informatica UFPE Cidade Universitaria Recife Pernambuco Brazil Center for Distributed and Mobile Computing ECECS University of Cincinnati Cincinnati OH USA

The emergence of Bluetooth as a default radio interface allows handheld electronic devices to be instantly interconnected into ad hoc networks. These short range ad-hoc wireless networks, called piconets, operate in the unlicensed 2.45 GHz ISM (Industrial-Scientific-Medical) band where up to eight devices may be used to configure single or overlapping piconets. This creates interference on the device from other devices operating in the same frequency band including microwaves and devices enabling various wireless LAN standards. This paper uses a signal capture model to study piconet MAC performance. Furthermore, simulations are used to validate the throughput obtained from this model. These results reveal important performance implications of the effect of inter-piconet interference on throughput.

关键词： Bluetooth Media Access Protocol Personal area networks Interference Throughput Ad hoc networks Wireless networks Frequency Microwave devices Wireless LAN

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Piconet interference modeling and performance evaluation of Bluetooth MAC protocol

Piconet interference modeling and performance evaluation of ...

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： C. de Morais Cordeiro D. Sadok D.P. Agrawal Centro de Informática UFPE Cidade Universitária Recife Pernambuco Brazil Center for Distributed and Mobile Computing ECECS University of Cincinnati Cincinnati OH USA

The emergence of Bluetooth as a default radio interface has allowed handheld electronic devices to be instantly interconnected as ad-hoc networks. These short range ad-hoc wireless networks, called piconets, operate in the unlicensed 2.45 GHz ISM (industrial-scientific-medical) band where up to eight devices may be used to configure single or overlapping piconets. As all piconets operating in the same frequency band, the presence of multiple piconets creates interference on signal reception. This paper employs a signal capture model to study the piconet MAC performance, taking inter-piconet interference into consideration. Furthermore, extensive simulation is performed to validate the throughput obtained from our model. These results indicate that Bluetooth throughput is sensibly affected by multiple piconet interference.

关键词： Personal area networks Interference Bluetooth Media Access Protocol Throughput Wires Access protocols Analytical models Ad hoc networks Wireless networks

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Modeling of handoffs and performance analysis of wireless data networks

Modeling of handoffs and performance analysis of wireless da...

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International Conference on Parallel Processing Workshops (ICPPW)

作者： Qing-An Zeng D.P. Agrawal Center for Distributed and Mobile Computing Department of Electrical & Computer Engineering and Computer Science University of Cincinnati OH USA

关键词： Performance analysis Land mobile radio cellular systems Quality of service mobile computing Computer networks distributed computing Delay Personal communication networks Phase detection Standards organizations

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Performance analysis of preemptive handoff scheme for integrated wireless mobile networks

Performance analysis of preemptive handoff scheme for integr...

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GLOBECOM'01. IEEE Global Telecommunications Conference (Cat. No.01CH37270)

作者： Jingao Wang Qing-An Zeng D.P. Agrawal Center of Distributed and Mobile Computing Department of Electrical & Computer Engineering and Computer Science University of Cincinnati Cincinnati OH USA

We propose and analyze a preemptive handoff scheme for an integrated real-time and non real-time service wireless mobile network. The total channels of each cell are divided into three parts, one is for real-time service calls only, the second is for non real-time service calls only, and the last one is for overflowed handoff requests that can not be served in the first two parts. Out of third part, a few channels are reserved exclusively for the real-time handoffs service. To give the real-time service handoff requests higher priority over non-real-time service handoff requests, the real-time service handoff request is allowed to preempt the non-real-time service call when it finds no channel available on its arrival. The interrupted non-real-time service call returns back to the non-real-time service handoff request queue. The system is modeled by a multi-dimensional Markov chain and a numerical analysis is presented to estimate blocking probabilities of originating calls, forced termination probability of real-time service handoff requests calls, and average transmission delay of non-real-time service calls. This scheme is also simulated using extensive runs and both results are observed to agree fairly well. It is seen that the forced termination probability of real-time service calls is significantly reduced with our scheme while the probability of packet loss of non-real-time transmission is made to be negligibly small, as a non- real-time service handoff request can be transferred from the queue of current base station to another one.

关键词： Performance analysis Telecommunication traffic Delay estimation Traffic control mobile computing Computer science Numerical analysis Delay effects Propagation losses Base stations

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