Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
1998-05-13
2001-05-08
Maung, Nay (Department: 2681)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S466000
Reexamination Certificate
active
06230027
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a transmission system for transmitting information signals of a first type, said system comprising at least a base station including transmission means for transmitting to at least one satellite station at least one information signal of a second type which is a time information signal.
The invention also relates to a base station including transmission means for transmitting information signals of a first and a second type to at least one satellite station, the information signals of the second type being time information signals, and also relates to a satellite station intended to exchange information signals of a first type with a base station and which satellite station includes a device for issuing information signals of a second type, the information signals of said second type being time information signals.
The invention likewise relates to a “Local Control” message as defined by the ETACS and AMPS standards.
The invention finally relates to a method of issuing at least one information signal of a first type called time information by a satellite station intended to exchange information signals of a second type with a base station, and also to a method of transmitting a time information signal from a radio base station to a mobile radio station of a radio communications network.
BACKGROUND OF THE INVENTION
Japanese patent abstract no. 59-64939 describes a mobile radio system in which a radio base station transmits a time information signal to a mobile radio station. This time information signal is used for correcting an internal clock of the mobile radio station.
The use of an internal clock in a mobile radio station presents the drawback of taking up space and consuming energy, which reduces the time during which the station can operate autonomously. The cumbersomeness and the time during which mobile radio stations can operate autonomously are two essential criteria for the choice of the clients. It is thus particularly important to optimize these items.
SUMMARY OF THE INVENTION
Therefore, a transmission system according to the invention and as defined in the opening paragraph is characterized in that, whereas said time information is defined with a certain precision, said base station comprises means for activating said transmission means for a period of time shorter than or equal to said precision, and said satellite station comprises display means for displaying time information transmitted by said base station.
A base station according to the invention is characterized in that, whereas said time information signals are defined with a certain precision, said base station comprises means for activating said transmission means for a period of time shorter than or equal to said precision.
A satellite station according to the invention is characterized in that the device for issuing time information signals comprises:
means for receiving time information signals defined with a certain precision and transmitted by said base station for a period of time shorter than or equal to said precision,
display means for displaying received time information signals.
And a display method according to the invention and as described in the opening paragraph is characterized in that, whereas said time information signals are defined with a certain precision, the method comprises:
periodically transmitting a time information signal from the base station to the satellite station for a period of time shorter than or equal to said precision,
displaying the time information signals received by the satellite station on the display of said satellite station.
When said system is a radio communications system according to a standard of the ETACS or AMPS type, said time information signal is advantageously transmitted in a message entitled Local Control defined in said standards.
In accordance with these ETACS standards, the base radio stations of a radio telecommunications network issue messages called Local Control messages to the mobile radio stations which are located in their coverage area, whereas the use of these messages is not defined by the standard. These messages are not actually used by the network operators. The invention in this respect proposes here a particularly interesting application.
These and other aspects of the invention will be apparent from and elucidated with reference to the embodiments described hereinafter.
REFERENCES:
patent: 4204167 (1980-05-01), Liu
patent: 4466130 (1984-08-01), Sewerinson
patent: 4926446 (1990-05-01), Grover et al.
patent: 5105396 (1992-04-01), Ganter et al.
patent: 5347562 (1994-09-01), Candy
patent: 5363377 (1994-11-01), Sharpe
patent: 5367524 (1994-11-01), Rideout, Jr.
patent: 5448533 (1995-09-01), Owen
patent: 5548811 (1996-08-01), Kumagai et al.
patent: 5590092 (1996-12-01), Fehnel
patent: 5712867 (1998-01-01), Yokev et al.
patent: 5740129 (1998-04-01), Frampton
patent: 5774057 (1998-06-01), Kalbermatter
patent: 5943606 (1999-08-01), Kremm et al.
patent: 5995846 (1999-11-01), Jakobsen
patent: 59-64939 (1984-04-01), None
patent: WO9116670 (1991-10-01), None
ETACS Standard: Extended Total Access Communications Systems, —Mobile Station Land Station Compatibility Specification Issue 4—Amendment 2—Feb. 1995.
AMPS Standard: Mobile Station—Base Station Compatibility Standard for 800 MHZ Analog Cellular—TIA/EIA/IS-91.
Gelin Jean A
Halajian Dicran
Maung Nay
U.S. Philips Corporation
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