Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1995-12-22
1998-08-11
Vo, Nguyen
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
454 63, 454426, H04M 1100, H04Q 730
Patent
active
057941513
ABSTRACT:
A shared spectrum communications unit and system provides communications without interfering with incumbent point-to-point receivers. This system includes a transmitter (e.g., of a PCS device) and a geographical location device which is operatively associated with the transmitter. The geographical locating device determines the position of the transmitter, and provides position information to a frequency authorization device. Geographical information pertaining to the PCS device is compared with the locations of the incumbent point-to-point receivers, using a database of the frequency authorization device including the locations of the point-to-point receivers, and a frequency allocation/authorization is generated to the PCS device when the PCS device is located outside of a predetermined range associated with local point-to-point receivers. An authorized frequency is stored and employed by the frequency authorization device for control of the operating frequency of the PCS device.
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"Personal Communications Services Spectrum Sharing with Private Microwave Services at 1850-1990MHz", Motorola, Inc., Jun. 1991.
D'Amico Thomas V.
Freeburg Thomas A.
McDonald James A.
Ruthenberg Ross E.
Dunlop Hugh C.
Kincaid Lester G.
Motorola Inc.
Vo Nguyen
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