Device for broadcasting digital information via satellite from a plurality of earth stations
First Claim
Patent Images
1. 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.
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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.
16 Citations
28 Claims
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1. A device for broadcasting digital information via satellite from a plurality of earth stations, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device for broadcasting digital information via satellite from a plurality of earth stations, comprising:
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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. - View Dependent Claims (21)
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10. A device for broadcasting digital information via satellite from a plurality of earth stations, comprising:
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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.
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11. A device for broadcasting digital information via satellite from a plurality of earth stations, comprising:
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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. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A device for broadcasting digital information via satellite from a plurality of earth stations, comprising:
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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.
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20. A device for broadcasting digital information via satellite from a plurality of earth stations, comprising:
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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. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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Specification