Telecommunications – Transmitter and receiver at separate stations
Patent
1981-03-05
1983-07-05
Ng, Jin F.
Telecommunications
Transmitter and receiver at separate stations
455 34, 455 56, 455 62, 34082544, H04B 100
Patent
active
043922422
ABSTRACT:
There is provided a mobile transmission system wherein a plurality of radio zones, each including one radio base station, the base stations of all radio zones being controlled by a control center which controls a paging and an origination of a mobile, are arranged to form a service area, and each radio zone is provided with at least one mobile access channel and a single mobile paging channel assigned with radio frequency common to all radio zones, thus establishing speech channels for the mobiles. The frequency of the mobile access channel is made to be different for adjacent radio zones and one or more frequencies are allocated to each base station. The control center is provided with a system for controlling an origination signal of the mobile for selecting at least one channel among available channels allocated to a radio base station associated with the mobile, circuit switching system operatively connected to the origination control system, for establishing the mobile access channel, and a system for broadcasting a channel number of the established mobile access channel to all radio zones through the mobile paging channel. Each mobile is provided with a receiver for receiving the channel number of the mobile access channel, means for updating and storing the received channel number, and a system for sequentially receiving radio waves transmitted through the stored access channel and for comparing received field intensities from the radio zones with each other to select a mobile access channel adapted to send out an origination signal of the mobile.
REFERENCES:
patent: 3663762 (1972-05-01), Joel, Jr.
patent: 3913017 (1975-10-01), Imaseki
patent: 3983492 (1976-09-01), Fisher et al.
patent: 4127744 (1978-11-01), Yoshikawa et al.
patent: 4144412 (1979-03-01), Ito et al.
patent: 4308429 (1981-12-01), Kai et al.
Ng Jin F.
Nippon Electric Co. Ltd.
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