Multiplex communications – Wide area network – Packet switching
Patent
1993-01-29
1994-10-11
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
3701051, 359136, 455 531, H04B 7212, H04B 724
Patent
active
053553683
ABSTRACT:
In a method of allocating time slots for transmission in a half-duplex time division multiple access point-to-multipoint bidirectional transmission system enabling transmission between a central station and a plurality of remote stations at least one time slot is allocated to each remote station and to each transmission direction. The set of all time slots used for transmission from the central station to the remote stations are grouped into downward frames and the set of all time slots used for transmission from the remote stations to the central station are grouped together in upward frames. The origin time of the upward frame is chosen in each remote station so that in the central station the origin time of the frame is separated from the end time of downward frames by a period less than twice the transmission time between the remote station and the central station, whereby there is defined in the remote station an overlap area between upward and downward frames. The time slots are allocated in such a way as to avoid any coincidence between time slots allocated to the same remote station in the upward and downward frames, respectively, in the overlap area.
REFERENCES:
patent: 4644534 (1987-02-01), Sperlich
patent: 5117423 (1992-05-01), Shepherd et al.
patent: 5173899 (1992-12-01), Ballance
Allaire Serge
Dore Pierre
Marcel Francois
Sallaerts Dany
Alcatel Cit
Kizou Hassan
Olms Douglas W.
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