Ericsson Gmbh

Sony Ericsson Mobile Communications Ab

Norbert Donald Ingram

Jacobus Cornelis Haartsen

William O Camp, Jr

Seung Kil Kim

Phillip Marc Johnson

Light sources are affixed at appropriate positions in a multilevel structure or in an obstructed environment. The light sources generate modulated light signals, such as controlled light-emitting diodes, which identify the positions of the light sources by their three-dimensional global positioning coordinates and/or equivalent representation that specifies their in situ locations in the environment. Mobile communication devices, upon receiving the light signals, can derive spatial positioning information and transmit such information to a remote location, such as an emergency response system.

System and method for determining positioning information via modulated light

A circuit is disclosed for switching power to a battery operated device, particularly a portable radio transceiver. The power control circuit uses an on/off switch that remains in a fixed 'on' or 'off' position instead of using a momentary push button switch. The circuit allows powering down the radio to prevent deep discharging of the battery even though the switch remains in the 'on' position. Also, the circuit allows the radio to continue to be powered up under microprocessor control after the switch is placed in the 'off' position.

Growing community of inventors

Cary, NC, United States of America

Norbert Donald Ingram