Multiplex communications – Wide area network – Packet switching
Patent
1992-05-29
1994-04-05
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 853, 370 93, 370 953, 3701041, 375111, 371 32, 371 35, H04B 7212
Patent
active
053011945
ABSTRACT:
The present invention provides a packet re-transmitting system for a slotted-ALOHA type satellite communication system wherein communications are effected between a central office and a large number of local offices by way of a communications satellite and which decreases a packet re-transmitting time remarkably. The central office transmits a frame synchronizing signal, manages a reception slot number in a predetermined phase relationship with the frame synchronizing signal, detects a condition of a reception signal from any of the local offices and sends back a receiving condition signal including a reception slot number and detection information of a receiving condition at the point of time. Each of the local offices manages a transmission slot number in a predetermined phase relationship with a received frame synchronizing signal, compares a transmission slot number at a point of time when a packet was transmitted with a reception slot number in the receiving condition signal and re-transmits, when the transmission slot number corresponds to the reception slot number in the receiving condition signal and detection information of a received condition indicates irregularity, the transmission packet.
REFERENCES:
patent: 4398289 (1983-08-01), Schoute
patent: 4766599 (1988-08-01), Miyazaki
patent: 4817089 (1989-03-01), Paneth et al.
patent: 5172375 (1992-12-01), Kou
Blum Russell
Fujitsu Limited
Olms Douglas W.
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