Multiplex communications – Wide area network – Packet switching
Patent
1991-07-12
1993-05-11
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
3701101, 379 59, 455 331, H04J 316, H04J 312, H04Q 700, H04B 700
Patent
active
052107523
ABSTRACT:
In a radio tele-communication system of this invention, each mobile station is designed to determine whether a control radio frequency can be used and to determine whether any free time slots are included in the time slots of a plurality of speech radio frequencies. A calling operation is performed by selecting a radio channel for the calling operation from the free time slots of the plurality of speech radio frequencies and the control radio frequency on the basis of the determination results.
REFERENCES:
patent: 4850033 (1989-07-01), Eizenhofer et al.
patent: 4949395 (1990-08-01), Rydbeck
patent: 5081623 (1992-01-01), Ainscow
patent: 5081704 (1992-01-01), Umeda et al.
Ito Koichi
Tanaka Masayuki
Umemoto Yuji
Jung Min
Kabushiki Kaisha Toshiba
Olms Douglas W.
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