Tdma point-to-multipoint communications system

Details Tdma point-to-multipoint communications system Tdma point-to-multipoint communications system

H - Electricity

04

J

363/10

H04J 3/16 (2006.01) H04J 3/06 (2006.01) H04L 5/14 (2006.01) H04L 12/40 (2006.01)

Patent

CA 1234435

ABSTRACT OF THE DISCLOSURE A TDMA point-to-multipoint communications system composed of a central station and a plurality of substations, with multiple utilization of a transmission band and with the transmission time between the central station and the substations having a different value for each substation, is operated to effect transmission between the central station and the substations in a succession of time frames, by the steps of: transmitting from the central station, during a first time period, a succession of signal groups, each directed to a respective substation in a sequence such that the first transmitted signal group is directed to the substation having the longest associated transmission time and the last transmitted signal group is directed to the substation having the shortest associated transmission time: transmitting a respective signal group from each substation to the central station during a second time period following the first time period, the respective signal group being transmitted from each substation at a selected time after completion of transmission to that substation of a signal group from the central station during -1- the first time period, the selected times being such that transmission from the substations during the second time period is in an order inverse to the order in which signal groups are transmitted to the substations during the first time period, and the selected times including the time required for each substation to switch from a receiving state to a transmitting state. - 1a -

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