Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
1997-11-19
2001-06-12
Hunter, Daniel (Department: 2684)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S090300, C455S097000, C455S575100
Reexamination Certificate
active
06246891
ABSTRACT:
TECHNICAL FIELD
The invention relates to mobile communication units as well as to radio transmitters for communicating with such mobile communication units.
BACKGROUND OF THE INVENTION
The radio parts of mobile communication units, e.g. mobile phones or more advanced, intelligent mobile phones also having a computer part of some kind, may interfere in a hazardous way with electronic equipment in e.g. airplanes, airport terminal buildings, hospitals and other buildings having a demand on high margins against radio frequency interference.
Today, it is up to the individual users of such mobile communication units to switch off the units upon entering such restricted areas.
By switching off the units, also the computer part, if any, will of course be switched off. However, it may be desirable to use the computer part of such units in such restricted areas without running the risk of disturbing sensitive electronic equipment even if the radio parts have been switched off.
BRIEF DESCRIPTION OF THE INVENTION
One object of the invention is to bring about a mobile communication unit in which e.g. the computer part, if any, can be used also in areas having restrictions on radio frequency emission.
This is attained by means of the mobile communication units according to the invention by providing them with means for actively preventing the radio frequency emitting parts of the unit from causing disturbances at the same time as non-radio frequency emitting parts of the unit may be used by a user.
Another object is, on the one hand, to bring about mobile communication units in which at least the radio part is automatically switched off upon entering an area with restrictions on radio frequency emission, and, on the other hand, to bring about a radio transmitter cooperating with such mobile communication units to switch them off upon entering such restricted areas.
This is attained in accordance with the invention by providing the mobile communication units with a detector for detecting a power shut-down signal emitted by a radio transmitter located in or near an area having restrictions on radio frequency emission. The power shut-down signal is emitted in order to turn off the power to at least the radio parts of mobile communication units entering the restricted area.
Hereby, it will be possible for a user to use other parts such as the computer part of such mobile communication units also in restricted areas without the risk of disturbing sensitive electronic equipment in such areas.
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Björkengren Ulf C.
Dahlkvist Mikael
Isberg B. Johanna
Khullar Anders
Liljegren L. Fredrik
Hunter Daniel
Nguyen Thuan T.
Nixon & Vanderhye P.C.
Telefonaktiebolaget LM Ericsson
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