Method for very high throughput satellite data transmission

Patent metadata

Field	Value
Publication number	US-2017366372-A1
Application number	US-201715619179-A
Country	US
Kind code	A1
Filing date	Jun 9, 2017
Priority date	Jun 16, 2016
Publication date	Dec 21, 2017
Grant date	—

Abstract

A method comprises a preprocessing step consisting, in the gateway station, in pre-segmenting the data as a function of the carrier frequency which is dedicated to them on the downlink DL, in reassembling and in encapsulating the pre-segmented data in successive basic frames DL BB-Frames, that can be transmitted over the downlink, each basic frame DL BB-Frame of the downlink being encapsulated by addition of a specific transport header DL BB-TH on the downlink and a data field, and a step consisting, in the gateway station, in incorporating the different basic frames DL BB-Frames of the downlink in the data field of the different basic frames UL BB-Frames of the uplink.

First claim

1 . A method for transmitting data by satellite between a gateway station and user terminals, the data being transmitted to the satellite by the gateway station over an uplink UL in the form of a succession of frames and retransmitted by the satellite over a downlink DL to the user terminals, the retransmission of the data over the downlink DL being performed after modulation with a carrier frequency dedicated to the corresponding downlink DL, the method consisting, in the gateway station, in segmenting, assembling and encapsulating the data in different successive basic frames UL BB-Frames, that can be transmitted over the uplink, each basic frame UL BB-Frame comprising a header field UL BBHeader, dedicated to the uplink UL, and a data field UL DATAFIELD to be sent over the uplink UL, then in coding and in modulating the data of each basic frame UL BB-Frame to construct frames UL PL-Frames and in sending the UL PL-Frames over the uplink UL, wherein the method further comprises:
a first additional preprocessing step consisting, in the gateway station, in pre-segmenting the data as a function of the carrier frequency which is dedicated to them on the downlink DL and in encapsulating the pre-segmented data in successive basic frames DL BB-Frames, that can be transmitted over the downlink, the encapsulation of each basic frame DL BB-Frame of the downlink consisting in adding a transport header DL BB-TH dedicated to the downlink, and a second additional step consisting, in the gateway station, in incorporating the different basic frames DL BB-Frames of the downlink, associated with their respective transport headers DL BB-TH, in the data field of the different basic frames UL BB-Frames of the uplink.

2 . The transmission method according to claim 1 , wherein the transport header DL BB-TH of each frame DL BB-Frame of the downlink comprises instructions intended for an OBP processor mounted on board the satellite, the instructions comprising at least one identification parameter DL Id of a modulator/coder to be used on the downlink, an identifier of the carrier frequency to be used, a start parameter and an end parameter indicating the start and the end of the corresponding frame DL BB-Frame, and a length parameter of the corresponding frame DL BB-Frame.

3 . The transmission method according to claim 2 , wherein when a frame DL BB-Frame has a length greater than the length of the data field available in the UL BB-Frame of the uplink, the first additional preprocessing step further consists in fragmenting the corresponding frame DL BB-Frame into several fragments, then in encapsulating each fragment with a corresponding transport header DL BB-TH, and, the second additional step consists in incorporating the different fragments of the fragmented frame DL BB-Frame in different consecutive frames UL BB-Frames of the uplink.

4 . The transmission method according to claim 3 , further comprising, on board the satellite, in receiving the UL PL-Frames, in demodulating and decoding the data of the frames UL PL-Frames received to extract from them the UL BB-Frames then, from each UL BB-Frame, in extracting the fragments of DL BB-Frames and in reassembling the fragments to reconstruct the complete DL BB-Frames, in routing each DL BB-Frame to the modulator/coder corresponding to the identifier DL Id indicated in the specific header DL BB-TH of said DL BB-Frame, then in transmitting the modulated and coded frames over the downlink DL.

Assignees

• Thales Sa

Inventors

• Arnaud Mathieu
• Baudoin Cédric
• Niddam David
• Lautier Patrick

Classifications

• H04L12/66

  Arrangements for connecting between networks having differing types of switching systems, e.g. gateways · CPC title

• H04L12/4633 Primary

  Interconnection of networks using encapsulation techniques, e.g. tunneling · CPC title

• H04L69/22

  Parsing or analysis of headers · CPC title

• H04B7/15

  Active relay systems · CPC title

• H04B7/18517 Primary

  Transmission equipment in earth stations · CPC title