Device for broadcasting digital information via satellite from a plurality of earth stations
AssigneesOrganisation Europeenne de Telecommunications par Satellite Eutelsat, Agence Spatiale Europeenne
InventorsHuu Nghia Pham, Carlo Elia, Maria Gouta
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Abstract
In the device: at least one set of links sends packet formated digital information to the satellite, on at least two different frequencies; at least one satellite-borne module receives, multiplexes and re-formates the information on only one downlink; at least one of the links works in a Time Division Multiple Access (TDMA) mode.
Claims28
A device for broadcasting digital information via satellite from a plurality of earth stations, comprising:
- at least one set of links sending packet formatted digital information to the satellite, on at least two different frequencies;
- at least, one satellite-borne module which receives, multiplexes and re-formats the information on only one downlink;
- at least one of the links which works in a Time Division Multiple Access (TDMA) mode;
- wherein the structure of MPEG2 packets of the signal transmitted via the satellite is used as follows for a definition of the TDMA frames, these TDMA frames being generated on board the satellite:
- in lack of received data, the multiplexer generates jamming packets, the program identification (PID) of which takes a single value corresponding to each uplink;
- when an going uplink is configured in TDMA mode, the multiplexer makes a numbering, in a cyclic manner, of the order of the generated packets, a 5-bit field for numbering the jamming packets, in the useful part of the MPEG2 packet, is used for this purpose;
- when a burst in an going up station, among n stations, comes to the satellite in phase with a portion of TDMA frame, the DVB packets of this burst will be substituted to the jamming packets for this portion of TDMA frame.
A device for broadcasting digital information via satellite from a plurality of earth stations, comprising:
- at least one set of links sending packet formatted digital information to the satellite, on at least two different frequencies;
- at least, one satellite-borne module which receives, multiplexes and re-formats the information on only one downlink;
- at least one of the links which works in a Time Division Multiple Access (TDMA) mode;
- wherein a 52/48 ratio is used for the flow rate increase on the uplinks that are re-configured in TDMA mode.
A device for broadcasting digital information via satellite from a plurality of earth stations, comprising:
- at least one set of links sending packet formatted digital information to the satellite, on at least two different frequencies;
- at least, one satellite-borne module which receives, multiplexes and re-formats the information on only one downlink;
- at least one of the links which works in a Time Division Multiple Access (TDMA) mode;
- wherein a management of the TDMA mode is ensured by an indicator field, called PID field.
A device for broadcasting digital information via satellite from a plurality of earth stations, comprising:
- at least one set of links sending packet formatted digital information to the satellite, on at least two different frequencies;
- at least, one satellite-borne module which receives, multiplexes and re-formats the information on only one downlink;
- at least one of the links which works in a Time Division Multiple Access (TDMA) mode;
- wherein the PID field is used in a telemetry protocol.
A device for broadcasting digital information via satellite from a plurality of earth stations, comprising:
- at least one set of links sending packet formatted digital information to the satellite, on at least two different frequencies;
- at least, one satellite-borne module which receives, multiplexes and re-formats the information on only one downlink;
- at least one of the links which works in a Time Division Multiple Access (TDMA) mode;
- wherein the PID field is used for synchronization management.
A device for broadcasting digital information via satellite from a plurality of earth stations, comprising:
- at least one set of links sending packet formatted digital information to the satellite, on at least two different frequencies;
- at least, one satellite-borne module which receives, multiplexes and re-formats the information on only one downlink;
- wherein at least one of the links of a going up path (1a, 1b, . . . , 1n) of a transmission system of an earth station is configured in a Time Division Multiple Access (TDMA) transmission mode while at least one other link is configured in the continuous transmissions made.
Dependencies are inferred from the claim text.