Radio system

Details Radio system Radio system

2007-05-29

2007-05-29

Nguyen, Duc M. (Department: 2617)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C340S010100, C340S425500, C340S539230, C340S870030, C455S059000, C455S069000, C455S070000, C455S078000, C455S092000, C455S099000, C455S134000, C455S152100, C455S161300, C455S226200, C455S227000, C455S456200, C455S456300, C455S456400, C455S522000

Reexamination Certificate

active

09941732

ABSTRACT:
A stationary device20sends a portable-device finding signal to a portable device10from a plurality of stationary-device side antennae24and25, which are located at different positions. Upon receipt of the portable-device finding signal from the stationary device20, the portable device10sends a reception intensity data signal to the stationary device20. The stationary device20determines the current position of the portable device10by using reception intensity data of the portable-device finding signals, which are received at the stationary-device side antennae, from the portable device10.

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