Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2006-07-13
2010-10-19
Trost, IV, William (Department: 2472)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S403000, C455S422100, C455S454000, C370S431000
Reexamination Certificate
active
07818011
ABSTRACT:
The radio frequency (RF) environment is scanned and analyzed prior to entering a building or otherwise non-ideal propagation path environment. Upon entering the building or non-ideal propagation path environment, the mobile unit will scan the RF environment from within the building. An attenuation factor is determined for various frequencies. A channel then chosen to operate on in the cognitive system based on the attenuations of the various frequencies.
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patent: 2007/0133482 (2007-06-01), Grannan
Dajana Cassioli, “The role of path loss on the selection of the operating bands of UWB systems”, Personal, Indoor and Mobile Radio Communication, 2004, PIMRC 2004, 15th IEEE international Symposium on, vol. 4, Sep. 5-8, 2004 pp. 2789-2791.
Greg Durgin, “Measurments and Models for Radio Path Loss and Penetration Loss In and Around Homes and Trees at 5.85 GHz”, IEEE Transactions on Communications, vol. 46, No. 11, Nov. 1998.
Y.P.Zhang, “Measurements of the Characteristics of Inddor Penetration Loss”, Vehicular Technology Conference, 1994 IEEE 44th.
Buchwald Gregory J.
Ecklund Lawrence M.
Kuffner Stephen L.
Doutre Barbara R.
Haas Kenneth
Liu Siming
Motorola Inc.
Trost, IV William
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