Patent
1977-04-22
1978-06-20
Griffin, Robert L.
325 55, 325 64, 179 2E, H04B 100
Patent
active
040964400
ABSTRACT:
A control system for mobile radio communication, in which the whole service area is composed of a plurality of small radio service zones in each of which communication is sufficiently possible with the transmitting power of any of mobile stations belonging to the service zone, a base station of each of the small radio service zones and a control station for controlling the whole service area are interconnected through a binary code transmission line, and in order to prevent simultaneous transmission of the control signal from a plurality of mobile stations when the mobile stations in the whole service area achieve transmission and reception of the control signal between each of them and the control station over a common control channel, the control station transmits to the mobile stations information representative of the busy or idle status of the common control channel from the mobile stations by the interruption and transmission of an idle line indication signal. By reversing the signal state of the binary code transmission line to its normal state, information of the detection of transmission from the mobile stations by the base stations is transmitted to the control station, and in the control station, the idle channel indication signal is interrupted by the earliest one of the reversed signals arriving from the plurality of base stations. The start of the control signal is indicated by restoring the signal state of the binary code transmission line to its normal state. The control station resumes transmission of the idle channel indication signal upon completion of the reception of the control signal.
REFERENCES:
patent: 3173996 (1965-03-01), Rypinski, Jr.
patent: 3376509 (1968-04-01), Willcox et al.
patent: 3582787 (1971-06-01), Muller
patent: 3663762 (1972-05-01), Joel, Jr.
patent: 3819872 (1974-06-01), Hamrick
patent: 3913017 (1975-10-01), Imaseki
Adams Bruce L.
Burns Robert E.
Griffin Robert L.
Lobato Emmanuel J.
Ng Jin F.
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