Multiplex communications – Wide area network – Packet switching
Patent
1994-02-10
1996-04-09
Hsu, Alpus H.
Multiplex communications
Wide area network
Packet switching
370 951, 3701101, 379 60, 379 63, 455 332, 455 334, 455 542, 455 561, 34082547, H04B 726, H04L 516, H04Q 700
Patent
active
055068375
ABSTRACT:
Cellular mobile radio systems provide full-duplex communication between base stations and mobile stations and with the fixed public service network. Also known are trunked mobile radio systems wherein a group of mobile users can exchange information with each other in the half-duplex mode over a common channel, only one user transmitting to the others at any time. It has been proposed to provide mobile radio sets which are especially adapted to be switched for use in either of such systems. The present invention avoids the need for specific adaptation of a mobile radio set for that purpose. Instead, it enables a cellular mobile radio system to be selectively converted into a trunked mobile radio system by providing for the base station to couple an up-link radio channel of any mobile user to down-link radio channels of a selected group of mobile users. One or more such user groups can be formed, only one radio channel being used for each group.
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Eizenhofer Alfons
Sollner Michael
Hsu Alpus H.
Schmitt Michael E.
U.S. Philips Corporation
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