Concept and Feasibility Study of Wide Area Ubiquitous Network for Sensors and Actuators

Umehira, Masahiro; Saitō, Hiroshi; Kagami, Osamu; Fujita, Takafumi; Fujino, Yosuke

doi:10.1109/vetecs.2007.46

Cited by 24 publications

(7 citation statements)

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“…The WAUN is worth discussing as a candidate system using those bands. (2) Course 2: Residential area Figure 8 PER performance in field experiments [6] …”

Section: Resultsmentioning

confidence: 99%

“…The block diagram of the experimental wireless system .for WAUNs developed for the field experiments is shown in Figure 5. We have conducted field experiments in Kanazawa city, Japan to confrrm the technical feasibility of the wireless system for WAUNs [6]. A map of Kanazawa city, which includes business areas, residential areas, and rural areas, is shown in Figure 6.…”

Section: Field Experimentalmentioning

confidence: 99%

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Design and experiments of wide area wireless network for sensors and actuators

Umehira

Saitō

Kagami

et al. 2008

2008 7th Asia-Pacific Symposium on Information and Telecommunication Technologies

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“…The WAUN is worth discussing as a candidate system using those bands. (2) Course 2: Residential area Figure 8 PER performance in field experiments [6] …”

Section: Resultsmentioning

confidence: 99%

Section: Field Experimentalmentioning

confidence: 99%

Design and experiments of wide area wireless network for sensors and actuators

Umehira

Saitō

Kagami

et al. 2008

2008 7th Asia-Pacific Symposium on Information and Telecommunication Technologies

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“…Existing networks, such as mobile networks, may be available but they may not be suitable for sensor networking or machine-to-machine communication. We have already proposed a network dedicated to such an objective [27], [28], but it may not be the final solution. In addition to the transport network, name resolution and ID remain important issues [29].…”

Section: Remaining Research Issuesmentioning

confidence: 99%

Local Information, Observable Parameters, and Global View

Saitō

2013

IEICE Trans. Commun.

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SUMMARYThe "Blind Men and an Elephant" is an old Indian story about a group of blind men who encounter an elephant and do not know what it is. This story describes the difficulties of understanding a large concept or global view based on only local information. Modern technologies enable us to easily obtain and retain local information. However, simply collecting local information does not give us a global view, as evident in this old story. This paper gives a concrete model of this story on the plane to theoretically and mathematically discuss it. It analyzes what information we can obtain from collected local information. For a convex target object modeling the elephant and a convex sensing area, it is proven that the size and perimeter length of the target object are the only parameters that can be observed by randomly deployed sensors modeling the blind men. To increase the number of observable parameters, this paper argues that nonconvex sensing areas are important and introduces composite sensor nodes as an approach to implement non-convex sensing areas. The paper also derives a model on the discrete space and analyzes it. The analysis results on the discrete space are applicable to some network related issues such as link quality estimation in a part of a network based on end-to-end probing.

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“…To overcome these problems and realize sensor network services, NTT has proposed a large cell-based cost-effective public sensor network; the Wide Area Ubiquitous Network (WAUN) [4] [5]. WAUN achieves a large cell radius of about 3.5-5km with wireless terminals that have low power consumption and simple configuration.…”

Section: Introductionmentioning

confidence: 99%

Cell Range Extension Techniques for Wide-Area Ubiquitous Network

Fujino

Kuwano

Ohmori

et al. 2011

2011 Tenth International Symposium on Autonomous Decentralized Systems

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This paper describes a newly developed wireless access system for the wide area ubiquitous network (WAUN), a large cell-based public sensor network. It introduces two key technologies to achieve WAUN with wide area coverage. The first is a digitalized radio over optical fiber (DROF) subsystem that allows cost-effective commercial packet based networks to transfer wireless RF signals among distributed access points. The second is a frequency offset transmitter diversity scheme that achieves suboptimal diversity gain without rate loss, regardless of the number of antennas, by using intentional and orderly frequency offset. Finally, we have devoloped a prototype system that implements the proposed techniques and confirm the feasibility of wide area coverage, i.e., cell radius of 3.5 km, through field trials.Keywords-sensor network, wide area ubiquitous network, digitized radio over fiver, frequency offset diversity

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Concept and Feasibility Study of Wide Area Ubiquitous Network for Sensors and Actuators

Cited by 24 publications

References 0 publications

Design and experiments of wide area wireless network for sensors and actuators

Design and experiments of wide area wireless network for sensors and actuators

Local Information, Observable Parameters, and Global View

Cell Range Extension Techniques for Wide-Area Ubiquitous Network

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