Multiplex communications – Duplex – Communication over free space
Patent
1995-04-12
1997-04-01
Blum, Russell W.
Multiplex communications
Duplex
Communication over free space
455 332, 455 341, 455 541, 455 571, 379 60, 379 63, 370344, 370496, 370522, H04B 7208
Patent
active
056174128
ABSTRACT:
In a digital half-duplex frequency division multiple access radio system a mobile station is either sending or receiving. For each call between a mobile station and a base station, a first frequency is allocated for the up link direction (from the mobile station to the base station) and a second frequency is allocated for the down link direction (from the base station to the mobile station). The signals exchanged by the stations are organized in frames of predetermined fixed duration grouped into multiframes comprising a predetermined number of frames including at least one control frame. At least some of the control frames are listening frames during which the sending mobile station interrupts sending, switches to receive mode and (if appropriate) reverts to send mode.
REFERENCES:
patent: 4549293 (1985-10-01), Christian et al.
patent: 4573207 (1986-02-01), Smith et al.
patent: 5235598 (1993-08-01), Sasuta
patent: 5479410 (1995-12-01), Paavonen
French Search Report FR 9404556.
Andrieu Vianney
Delprat Marc
Gaydu Gladys
Gourgue Frederic
Nouchi Charles
ALCATEL N.V.
Blum Russell W.
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