Radio telephone system and antenna device and base station for the same
First Claim
1. A TDMA system radio telephone system comprising:
- a base station having a transmit/receive operation;
an antenna being installed at a location away from said base station, said antenna having a transmit/receive operation;
an antenna device being provided between said base station and said antenna;
separate transmission lines for transferring a send signal and a receive signal between said antenna device and said base station, said send and receive signal establishing a control channel and a speech channel, and said control channel having prearranged slots therein;
said control channel being continuously monitored by the antenna device while said speech channel is being set; and
means for synchronizing transmit/receive switching of said antenna in said antenna device with the transmit/receive operation at said base station in accordance with the receiving timing of a particular slot of the control channel.
1 Assignment
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Accused Products
Abstract
A radio telephone system and an antenna device and a base station for the same which permit the expansion of a radio communication range and also further extension of the distance between the base station and an antenna. A single base station accommodates a plurality of antenna devices and the base station and the antenna devices are connected by optical fiber cables. Each of the antenna devices is equipped primarily with an optical-to-electrical converter, an electrical-to-optical converter, a distributor, frequency converters/amplifiers, local frequency oscillators, a control channel signal detector, a transmit/receive switcher, a controller, and antenna. The transmit/receive switching control is synchronized with the transmitting and receiving timings for send and receive signals transferred to and from the base station by using a slot number transmitted through a transmission control channel. The plurality of antenna devices connected to the single base station make it possible to expand the radio communication range to an arbitrary range in practical use; they also permit free selection of an area of radio communication range by connecting the base station with the antenna devices by optical fiber cables. In addition, the transmit/receive switching control of the antenna devices is carried out in accordance with the receiving timing of a slot number of a transmission control channel from the base station. This ensures accurate transmit/receive switching control.
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Citations
10 Claims
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1. A TDMA system radio telephone system comprising:
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a base station having a transmit/receive operation; an antenna being installed at a location away from said base station, said antenna having a transmit/receive operation; an antenna device being provided between said base station and said antenna; separate transmission lines for transferring a send signal and a receive signal between said antenna device and said base station, said send and receive signal establishing a control channel and a speech channel, and said control channel having prearranged slots therein; said control channel being continuously monitored by the antenna device while said speech channel is being set; and means for synchronizing transmit/receive switching of said antenna in said antenna device with the transmit/receive operation at said base station in accordance with the receiving timing of a particular slot of the control channel. - View Dependent Claims (2)
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3. An antenna device which is connected to the base station of the TDMA system radio telephone system, which exchanges optical signals with the base station optical signals, and which is linked to the base station by a first optical fiber cable for transmitting a send signal and by a second optical fiber cable for transmitting a receive signal, the antenna device comprising:
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optical-to-electrical converting means for convening the send signal transmitted by the first optical fiber cable from an optical signal to an electrical signal; distributing means for distributing the send signal issued by the optical-to-electrical converting means to a first signal path and a second signal path; an antenna; transmit/receive switching means having a switching operation for alternately connecting the antenna to the first signal path and a third signal path; electrical-to-optical converting means for converting the receive signal transmitted to the third signal path from an electrical signal to an optical signal before transmitting it to the second optical fiber cable when the antenna is connected to the third signal path by the transmit/receive switching means; and switching control means for isolating a control channel from the send signal transmitted to the second signal path and for analyzing the control channel to synchronize the switching operation of the transmit/receive switching means with the transmit/receive operation of a speech channel in accordance with a receiving timing of particular information of a particular slot written in the control channel. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10)
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Specification