Mobile communication system having a small base station and equipment for its system
First Claim
1. A mobile communication system comprising a base station and a central station, said base station being connected to said central station via an optical transmission line, said base station time-divisionally performing a transmitting operation and a receiving operation using a transmit timeslot and a receive timeslot at the same frequency between the base station and a mobile station;
- wherein;
said central station comprises;
modulation means for modulating a time-division multiple signal;
electric/optic converter means for converting an output signal of said modulation means to an optical signal during said transmit timeslot for said mobile station, and sending the optical signal to said optical transmission line;
optic/electric converter means for receiving an optical signal from said base station via said optical transmission line during said receive timeslot for said mobile station, and converting the received optical signal to an electrical signal; and
demodulation means for demodulating an output signal from said optic/electric converter means; and
said base station comprises;
optic/electric converter means for receiving the optical signal from said central station via said optical transmission line, and converting the received optical signal to an electrical signal;
transmit amplifier means for amplifying an output signal from said optic/electric converter means;
receive amplifier means for amplifying a received signal from the mobile station;
electric/optic converter means for converting an output signal of said receive amplifier means to an optical signal, and sending the optical signal to said central station via said optical transmission line; and
switching control means, coupled to said transmit amplifier means and said receive amplifier means, for detecting the output signal of said optic/electric converter means, and discriminating said transmit timeslot for said mobile station, and time-divisionally switching said transmitting operation and said receiving operation based on the discriminated transmit timeslot for said mobile station.
1 Assignment
0 Petitions
Accused Products
Abstract
A mobile communication system having a small base station provides radio communications between the small base station and a mobile station. The small base station is connected with a central station via an optical transmission line. The central station includes a modulation section which modulates a time-division multiple signal, an electric/optic converter section which converts an output signal of the modulation section to an optical signal, and sends the optical signal to the optical transmission line. The central station further includes an optic/electric converter section which receives an optical signal from the small base station via the optical transmission line, and converts a received optical signal to an electrical signal, and a demodulation section which demodulates an output signal from the optic/electric converter section. The small base station includes an optic/electric converter section which receives the optical signal from the central station via the optical transmission line, and converts the received optical signal to an electrical signal, a transmit amplifier section which amplifies an output signal from the optic/electric converter section, a receive amplifier section which amplifies a received signal from the mobile station. The small base station further includes an electric/optic converter section which converts an output signal from the receive amplifier section to an optical signal, and sends the optical signal to the central station via the optical transmission line, and a transmit/receive switching control section for the mobile station.
-
Citations
26 Claims
-
1. A mobile communication system comprising a base station and a central station, said base station being connected to said central station via an optical transmission line, said base station time-divisionally performing a transmitting operation and a receiving operation using a transmit timeslot and a receive timeslot at the same frequency between the base station and a mobile station;
wherein; said central station comprises; modulation means for modulating a time-division multiple signal; electric/optic converter means for converting an output signal of said modulation means to an optical signal during said transmit timeslot for said mobile station, and sending the optical signal to said optical transmission line; optic/electric converter means for receiving an optical signal from said base station via said optical transmission line during said receive timeslot for said mobile station, and converting the received optical signal to an electrical signal; and demodulation means for demodulating an output signal from said optic/electric converter means; and said base station comprises; optic/electric converter means for receiving the optical signal from said central station via said optical transmission line, and converting the received optical signal to an electrical signal; transmit amplifier means for amplifying an output signal from said optic/electric converter means; receive amplifier means for amplifying a received signal from the mobile station; electric/optic converter means for converting an output signal of said receive amplifier means to an optical signal, and sending the optical signal to said central station via said optical transmission line; and switching control means, coupled to said transmit amplifier means and said receive amplifier means, for detecting the output signal of said optic/electric converter means, and discriminating said transmit timeslot for said mobile station, and time-divisionally switching said transmitting operation and said receiving operation based on the discriminated transmit timeslot for said mobile station. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
8. A mobile communication system comprising a central station and a base station connected to said central station via an optical transmission line, said base station time-divisionally performing a transmitting operation and a receiving operation using a transmit timeslot and a receive timeslot at the same frequency between the base station and a mobile station;
-
wherein; said central station comprises; modulation means for modulating a time-division multiple signal; electric/optic converter means for converting an output signal of said modulation means to an optical signal during said transmit timeslot for said mobile station, and sending the optical signal to said optical transmission line; optic/electric converter means for receiving the optical signal from said base station via said optical transmission line during said receive timeslot for said mobile station, and converting a received optical signal to an electrical signal; demodulation means for demodulating an output signal from said optic/electric converter means; and control-signal multiplex means for multiplexing a control signal which indicates said transmit timeslot and said receive timeslot to the output signal of said modulation means at a different frequency from that of the output signal; and said base station comprises; optic/electric converter means for receiving the optical signal from said central station via said optical transmission line, and converting the received optical signal to an electrical signal; transmit amplifier means for amplifying an output signal from said optic/electric converter means; receive amplifier means for amplifying a received a signal from the mobile station; electric/optic converter means for converting an output signal of said receive amplifier section to an optical signal, and sending the optical signal to said central station via said optical transmission line; and switching control means, coupled to said transmit amplifier means and said receive amplifier means, for deriving said control signal from the output signal of said optic/electric converter, and time-divisionally switching said transmitting operation and said receiving operation for said mobile station by the derived control signal. - View Dependent Claims (9, 10, 11, 12, 13)
-
-
14. A mobile communication system comprising a central station and a base station connected to said central station via an optical transmission line, said base station providing radio communications between the base station and a mobile station;
-
wherein; said central station comprises; modulation means for modulating a time-division multiple signal; automatic-gain-control amplifier means for amplifying an output signal of said modulation means; electric/optic converter means for converting an output signal of said automatic-gain-control amplifier means with gain-control information in the automatic-gain-control amplifier means to an optical signal, and sending the optical signal to said optical transmission line; optic/electric converter means for receiving an optical signal from said base station via said optical transmission line, and converting the received optical signal to an electrical signal; gain-control amplifier means for amplifying an output signal of said optic/electric converter means according to gain-control information from said base station; and demodulation means for demodulating an output signal of said gain-control amplifier means; said base station comprises; optic/electric converter means for receiving the optical signal from said central station via said optical transmission line, and converting the received optical signal to an electrical signal; gain-control amplifier means for amplifying an output signal of said optic/electric converter means according to the gain-control information from said central station; automatic-gain-control amplifier means for amplifying a received signal from said mobile station; and electric/optic converter means for converting an output signal of said automatic-gain-control amplifier means with gain-control information in the automatic-gain-control amplifier means to an optical signal, and sending the optical signal to said central station via said optical transmission line. - View Dependent Claims (15, 16, 17)
-
-
18. A base station equipment for time-divisionally transmitting or receiving a time-division multiple signal to or from a mobile station using a transmit timeslot or a receive timeslot of a signal frame format, the base station equipment comprising:
-
optic/electric converter means for receiving said time-division multiple signal as an optical signal from a central station coupled to the base station equipment via an optical transmission line, and converting the received optical signal to an electrical signal; transmit amplifier means for amplifying an output signal from said optic/electric converter section means; receive amplifier means for amplifying a received signal from said mobile station; electric/optic converter means for converting an output signal of said receive amplifier means to an optical signal, and sending the optical signal to said central station via said optical transmission line; and switching control means, coupled to said transmit amplifier means and said receive amplifier means, for detecting the output signal of said optic/electric converter means, discriminating said transmit timeslot for said mobile station, and switching a transmitting operation and a receiving operation, based on the discriminated timeslot, for said mobile station. - View Dependent Claims (19, 20)
-
-
21. Central station equipment for time-divisionally transmitting or receiving a time-division multiple signal to or from a base station connected to the central station equipment via an optical transmission line using a transmit timeslot or a receive timeslot of a signal frame format for a mobile station, the central station equipment comprising:
-
modulation means for modulating said time-division multiple signal; electric/optic converter means for converting an output signal of said modulation means to an optical signal during said transmit timeslot for said mobile station, and sending the optical signal to said optical transmission line; optic/electric converter means for receiving the optical signal from said base station via said optical transmission line during said receive timeslot for said mobile station, and converting a received optical signal to an electrical signal; demodulation means for demodulating an output signal from said optic/electric converter means; and control-signal multiplex means for multiplexing a control signal which indicates said transmit timeslot and said receive timeslot to the output signal of said modulation means at a different frequency from that of the output signal.
-
-
22. A base station equipment for time-divisionally transmitting or receiving a time-division multiple signal to or from a mobile station using a transmit timeslot or a receive timeslot of a signal frame format, the base station equipment comprising:
-
optic/electric converter means for receiving said time-division multiple signal as an optical signal from a central station connected to the base station equipment via an optical transmission line, and converting the received optical signal to an electrical signal; transmit amplifier means for amplifying an output signal from said optic/electric converter means; receive amplifier means for amplifying a received signal from the mobile station; electric/optic converter means for converting an output signal of said receive amplifier means to an optical signal, and sending the optical signal to said central station via said optical transmission line; and switching control means, coupled to said transmit amplifier means and said receive amplifier means, for deriving a control signal which indicates one of said transmit timeslot and said receive timeslot from the output signal of said optic/electric converter means, and for time-divisionally switching a transmitting operation and a receiving operation for said mobile station by the derived control signal. - View Dependent Claims (23, 24)
-
-
25. Central station equipment, for transmitting or receiving a time-division multiple signal to or from a base station connected to the central station equipment via an optical transmission line using a transmit timeslot or a receive timeslot of a signal frame format for a mobile station, the central station equipment comprising:
-
modulation means for modulating said time-division multiple signal; automatic-gain-control amplifier means for amplifying an output signal of said modulation means; electric/optic converter means for converting an output signal of said automatic-gain-control amplifier means with gain-control information in the automatic-gain-control amplifier means to an optical signal, and sending the optical signal to said optical transmission line; optic/electric converter means for receiving an optical signal from said base station via said optical transmission line, and converting the received optical signal to an electrical signal; gain-control amplifier means for amplifying an output signal of said optic/electric converter means according to gain-control information from said base station; and demodulation means for demodulating an output signal of said gain-control amplifier means.
-
-
26. A base station equipment for transmitting or receiving a time-division multiple signal to or from a mobile station using a transmit timeslot or a receive timeslot of a signal frame format, the base station equipment comprising:
-
optic/electric converter means for receiving a time-division multiple signal as an optical signal from a central station connected to the base station equipment via an optical transmission line, and converting the received optical signal to an electrical signal; gain-control amplifier means for amplifying an output signal of said optic/electric converter means according to the gain-control information from said central station, and transmitting an amplified signal; automatic-gain-control amplifier means for amplifying a received signal from said mobile station; and electric/optic converter means for converting an output signal of said automatic-gain-control amplifier means with gain-control information in the automatic-gain-control amplifier means to an optical signal, and sending the optical signal to said central station via said optical transmission line.
-
Specification