Packet re-transmitting system for satellite communication system of the slotted-aloha type
US5301194A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 29, 1992 |
| Grant date | Apr 5, 1994 |
| Priority date | — |
| Expiry date | May 29, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/18528
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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 …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.