Apparatus for expanding coverage area of base station

Details Apparatus for expanding coverage area of base station Apparatus for expanding coverage area of base station

2001-01-26

2004-04-13

Maung, Nay (Department: 2684)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C455S557000, C455S502000, C455S525000

Reexamination Certificate

active

06721576

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an apparatus for generating a base station clock; and more particularly, to an apparatus for controlling a global positioning system (GPS) reference signal to be provided to a base station modem to thereby expand a coverage area of the base station.
DESCRIPTION OF THE PRIOR ART
In general, a base station modem is operated based on a reference signal /pp2s (pulse per 2 seconds) and a system clock (19.6608 MHz) provided thereto from a global positioning system (GPS). In this case, a terminal transmits signals in synchronism with a Sync channel provided from the base station.
However, the signal provided from the terminal in the base station modem is delayed than time of the GPS reference signal/pp2s, and the base station modem can demodulate (call) signals with less delay than about 512PN chip (416.67 &mgr;sec), wherein 416.67 &mgr;sec will come to about 60 km in length.
In short, if signals transmitted from a terminal are received by the base station, the terminal being positioned at a distance more than about 60 km from the base station, the base station modem fails to demodulate the received signals to fail calling. In addition, a limited call coverage allows calling in a location at which the base station cannot be installed to be failed.
SUMMARY OF THE INVENTION
It is, therefore, a primary object of the present invention to provide an apparatus, which is capable of delaying a GPS reference signal to be forwarded to a base station modem for a certain time period and transmitting a delayed signal to the modem, to thereby establish calling between the base station and a terminal located at a certain distance from the base station.
In accordance with a preferred embodiment of the present invention, there is provided an apparatus for generating a clock signal used to expand a coverage area of a base station, which comprises: a clock reception means for generating a system clock and a pp2s (pulse per 2 seconds) signal based on a reference time provided from a global positioning system (GPS); a clock distribution means for distributing the system clock received from the clock reception means; a clock generation means for generating clock signals as base station synchronous signals to expand the coverage area by receiving the pp2s signal from the clock reception means; a multiplicity of base station modems for modulating/demodulating data in synchronism with the clock signal transmitted from the clock generation means; a control signal generation means for generating control signals; and a control means for allowing the data to be transmitted to a selected base station modem among the base station modems in response to a corresponding control signal from the control signal generation means.


REFERENCES:
patent: 5459728 (1995-10-01), Yoshioka et al.
patent: 5544171 (1996-08-01), Godecker
patent: 5819181 (1998-10-01), Kotzin et al.
patent: 6421330 (2002-07-01), Chung et al.
patent: 6483817 (2002-11-01), Antonio et al.

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