Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B7/00—Radio transmission systems, i.e. using radiation field
  • H04B7/14—Relay systems
  • H04B7/15—Active relay systems
  • H04B7/185—Space-based or airborne stations; Stations for satellite systems
  • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
  • H04B7/18539—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B7/00—Radio transmission systems, i.e. using radiation field
  • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
  • H04B7/12—Frequency diversity
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B7/00—Radio transmission systems, i.e. using radiation field
  • H04B7/14—Relay systems
  • H04B7/15—Active relay systems
  • H04B7/185—Space-based or airborne stations; Stations for satellite systems
  • H04B7/18523—Satellite systems for providing broadcast service to terrestrial stations, i.e. broadcast satellite service
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B7/00—Radio transmission systems, i.e. using radiation field
  • H04B7/14—Relay systems
  • H04B7/15—Active relay systems
  • H04B7/185—Space-based or airborne stations; Stations for satellite systems
  • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
  • H04B7/18532—Arrangements for managing transmission, i.e. for transporting data or a signalling message
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04B—TRANSMISSION
  • H04B7/00—Radio transmission systems, i.e. using radiation field
  • H04B7/14—Relay systems
  • H04B7/15—Active relay systems
  • H04B7/185—Space-based or airborne stations; Stations for satellite systems
  • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
  • H04B7/18539—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
  • H04B7/18541—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection for handover of resources

Definitions

• the invention relates to a method for managing the telecommunication data traffic of a very high speed satellite communication system.
• VHTS Very High Throughput Satellites
• the strategy of spatial or geographical diversity is based on the assumption that the spatial correlation of rainfall events decreases very strongly if we consider a distance between two sites of a few kilometers (typically 15 to 50 km). In other words, it is very unlikely to have heavy rain at the same time at two sites spaced by such a distance. For a light rain, it is between 200 and 1000 km, and for a storm 10 km. It is then possible to use one or more redundancy sites so that they support the feeder link between a ground station and a satellite when a station on the ground and in the rain.
• This spatial diversity strategy can take different forms depending on the type of redundancy chosen and its mode of realization.
• the diversity or load-sharing strategy is based on the principle that a user spot (geographical area on the surface of the earth) is served simultaneously by several baseband gateways or hubs in the English language. When one of the hubs suffers too much attenuation, all the terminals managed by the hub is switched to the other hubs serving these spots.
• This load sharing can be achieved by time or frequency multiplexing of the spectral resource.
• this technique can be performed either by assuming a loss of capacity of the system during the rain event or by allowing to maintain the system capacity (at the price of a greater number of hubs).
• n + p The diversity of sites n + p is for example described in the documents: - "Gateway Diversity Scheme for a Future Broadband Satellite System", by Argyrios Kyrgiazos, Barry Evans, Paul Thompson, and Jean Jeannin, 2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications Workshop (SPSC); and
• RF redundancy as illustrated in the example of Figure 1, consists of having for each hub 1 two RF ground stations 2, 3 sufficiently distant to decorrelate the rain events (at least 15 km, and typically 50 km).
• the corresponding RF gateway 4 or gateway in English language is also represented.
• This technique also meets the requirement of system availability. It is also relatively simple to implement since it has no impact on the high layers and does not require specific switching on board. It nevertheless requires a strong synchronization of the two RF paths, obtained by pre-compensation techniques. However, it appears relatively expensive in terms of connection cost in order to interconnect the two sites (n times), and of number of RF stations which are doubled, which significantly increases the operating expenses or OPEX and the expenses of investment or CAPEX of the ground segment.
• n + p sites can be presented as the reference redundancy scheme for very high speed systems called THD systems.
• the principle consists of having redundancy sites redundant to p sites simultaneously among the n nominal sites.
• This technique is extremely efficient in terms of availability, making it possible to reach availability significantly higher than the requirement (typically 99.9%) with a very small number of hubs (1 to 3 for systems with a few dozen hubs).
• This solution involves a hand-over of the hub (the redundant hub 5 can be considered as a clone of the nominal hub 6) and a rerouting of the traffic to the hub.
• redundant 5 network failover).
• this diversity scheme is similar to hot redundancy techniques, with the difference that the decision takes into account the level of attenuation.
• the switching from one hub 6 to another 5 is generally performed by electromechanical switches or switches, which leads to interruptions of service of several seconds.
• This solution has a higher cost but without loss of capacity in case of rain.
• n + p sites The diversity of n + p sites is for example described in the documents "Gateway diversity scheme for a future broadband satellite system” (Nicolas Jeannin, Argyrios Kyrgiazos, Barry Evans, Paul Thompson, 2012 6th Advanced Satellite Multimedia Systems Conference (ASMS) and 12th Signal Processing for Space Communications), and “Smart gateways for satellite satellites” (Nicolas Jeannin, Laurent Castanet, Jose Radzik, Michel Bousquet, Paul Evans, Paul Thompson, International Journal of Satellite, Communications and Networking, Vol 32 (no. 2), pp. 93-106, ISSN 1542-0973).
• a conventional solution is to manage a spot by means of several hubs simultaneously, each of them supporting a frequency sub-band. the frequency band of the spot.
• the objective is to be able to have the capacity provided by the hubs that are not in the rain, to ensure the service of the users of a hub that has an attenuation exceeding its power margin.
• This solution is also called "smart diversity" in English or diversity n + 0, since no additional hub is needed.
• This technique has the main advantage of not requiring an additional hub (and the associated interconnection) to achieve system availability.
• This scheme involves a more complex payload to separate and recombine the different subbands per spot.
• This solution has a reduced cost, but with a loss of capacity in case of rain.
• An object of the invention is to overcome the problems mentioned above, especially in case of rain, at reduced cost, to limit the loss of capacity.
• a method for managing the telecommunication data traffic of a very high-speed satellite communication system in which, for each satellite, it is implemented in a digital processor.
• transparent (DTP) in the satellite managing a variety of so-called n + p sites and / or load diversity to guarantee the availability of the very high speed communication system.
• Such a method avoids impacts on the payload, and does not add RF strings to handle additional RF gateways for diversity. It also avoids the need for additional footbridges on the ground.
• This method is also generic and benefits from the functions offered by the transparent digital processor DTP (flexible RF connectivity in the satellite). Finally, this method allows a fast reconfiguration in case of hub transfer and with very low losses at the satellite level (compared to solutions based on embedded switches). In one implementation mode, it implements in the transparent digital processor the management of transitions between the so-called n + p site diversity and / or the load diversity.
• transition between the two diversities is meant a transition from one to the other regardless of the meaning.
• a so-called n + p site diversity is implemented by the transparent digital processor, by switching from a nominal site to a diversity site, by rerouting the input ports of the nominal site. switched to said diversity site, whose output ports are those of the nominal site switched.
• a load-sharing diversity for serving a user spot by several sites is implemented by the transparent digital processor by cutting the frequency bandwidth into frequency sub-bands. and allocating these subbands to any set of output ports to multiplex them frequently on the one hand to the same site for the forward channel and on the other hand to different sites for the return channel.
• transitions of diversity are implemented in the transparent digital processor of the satellite so that:
• n + p sites or a load sharing diversity is implemented, a site corresponding to a gateway / hub / antenna assembly, p representing the number of sites; of diversity that can simultaneously redundant the n nominal sites in diversity of sites;
• a diversity of sites is implemented when the first period implements a load sharing diversity or maintained when the first period already implements a diversity of sites, and Nominal sites are added and n increases;
• a load sharing diversity is implemented, and the p diversity sites are used as nominal sites.
• Such a method allows in case of rain, at reduced cost, to have no loss of capacity.
• p is initially 1 or 2.
• a transition is made from the first period to the second period when the bandwidth managed by the initial nominal sites deployed during the first period is less than the total bandwidth required to serve all the terminals. using the communication system.
• the total bandwidth is a functional feature of the system: if at the beginning we have deployed two GW gateways each managing 12 GHz bandwidth, if the need for the terminals becomes greater than 24 GHz bandwidth, then we must deploy a gateway GW extra, and this is done before system saturation.
• a transition is made from the second period to the third period when the number of nominal sites is equal to the number of on-board reception channels on board the satellites of the very high speed communication system.
• a very high speed satellite communication system comprising means for managing the operation of the telecommunication data traffic comprising a transparent digital satellite processor for implementing the method. as previously described.
• FIG. 1 diagrammatically represents a method for managing telecommunication data traffic of a very high-speed satellite communication system with RF redundancy, according to the state of the art
• FIG. 2 diagrammatically illustrates a method of managing the telecommunication data traffic of a very high-speed satellite communication system with so-called n + p site diversity, according to the state of the art
• FIG. 3 schematically illustrates a method of managing the telecommunication data traffic of a very high-speed satellite communication system with load sharing, according to the state of the art
• FIG. 4 schematically illustrates a transparent digital processor (DTP)
• FIG. 5 diagrammatically represents a method for managing the telecommunication data traffic of a data communication system. very high speed satellite communication according to one aspect of the invention.
• FIGS. 6 and 7 represent a system for managing the telecommunication data traffic of a very high-speed satellite communication system, respectively for the forward payload and the return payload, according to one aspect of the invention. invention.
• the present invention relates to a method for managing the telecommunication data traffic of a very high-speed satellite communication system in which, for each satellite, a DTP transparent digital processor is implemented in the satellite. managing a variety of so-called n + p sites and / or a load diversity to guarantee the availability of the very high speed communication system.
• the transparent digital processor DTP is used to manage transitions between the so-called n + p site diversity and the load diversity.
• n + p site diversity is implemented by the transparent digital processor DTP, by switching from a nominal site to a diversity site, by rerouting the input ports of the nominal site switched to said site.
• diversity site whose output ports are those of the nominal site switched.
• a load-sharing diversity for serving a multi-site user spot is implemented by the DTP transparent digital processor by splitting the rising frequency bandwidth into frequency sub-bands, and allocating them. sub-bands to any set of output ports to multiplex them frequently on the one hand to the same site for the forward channel and on the other hand to different sites for the return channel.
• Figure 4 shows a transparent digital processor or DTP present in each satellite.
• the signals of the RFinput input ports are respectively scanned and filtered by the ADC acronym digitizing function for the English-language "Analogie Digital Converter" of the RX receiver module.
• the digitized samples thus obtained are then amplified by the gain function of the reception module RX.
• the digitized and amplified signals are then demultiplexed by the Demux demultiplexing function of the reception module RX, to be transmitted to the port of the connectivity switching matrix of the DTP, for example if the frequency band coming from an RFinput input port is greater than the input frequency band of the connectivity switching matrix of the DTP then it needs to be separated into several sub-frequency bands.
• the connectivity switching matrix then makes it possible to connect any sub-frequency band of an RFinput input port to any frequency sub-band of the same size as a RFoutput output port.
• the switching matrix Connectivity thus provides the function of switching and transposing frequencies.
• the digital signals at the output of the connectivity switching matrix are then multiplexed by the multiplexing function Mux of the TX transmission module to be adapted to the frequency bands of the output RFoutput ports.
• the amplified digital samples are then converted into analog signals by the digital-to-analog conversion function DAC for the acronym "Digital to Analogie Converter” in English and transmitted to the RFoutput (amplification and antenna) output ports.
• DAC Digital to Analogie Converter
• the Clock function is in charge of the fine synchronization of the DTP which is required on the one hand for the dating of the configuration commands and on the other hand for the reconstruction of the analog signals from the scanned samples that have passed through the connectivity matrix. .
• the Command & Control command and control function is in charge of the application of remotes from the ground and the sending of telemetries.
• the configuration of the channels will consist of defining for each carrier or group of carriers from the GW gateway a logical channel to an output user spot for the forward channel, and vice versa in the return channel.
• the configuration of the DTP consists for the nominal sites to connect the different groups of carriers sent by a gateway GW with the different user spots for the forward channel and vice versa for the return channel.
• Performing a nominal site switch n to a redundancy site p is performed by modifying the configuration of the logical channels of the gateway n to replace the input ports n by the input ports p (the frequency bands and transposition remaining identical).
• configuration consists of defining logical channels to a given user spot from multiple gateways.
• load-sharing diversity for example three gateways for a spot, three channels are defined for a given user spot on the one-way, each of them coming from a different gateway (and therefore from a port of RFinput input of different DTP).
• the definition of the channels via the transposition in frequency band then makes it possible to multiplex the different carriers to the same user spot.
• the configuration P2 is modified during the second period P2 to add additional gateways, and thus add additional channels that can be switched to the different user spots.
• FIG. 5 schematically represents a method for managing telecommunication data traffic of a very high-speed satellite communication system, according to one aspect of the invention.
• n + p sites or a load-sharing diversity is implemented, a site corresponding to a gateway / concentrator / antenna set, p representing the number of sites; diversity sites that can simultaneously redundant the n nominal sites in diversity of sites;
• a diversity of sites is implemented when the first period P1 implements a load sharing diversity or maintained when the first period P1 already implements a diversity of sites. , and nominal sites are added and n increases;
• a load-sharing diversity is implemented, and the p diversity sites are used as nominal sites.
• the present invention makes it possible to use two diversity techniques (n + p site diversity and load sharing), each in a moment when it is respectively the most suitable, and without adding equipment on board satellites or on the ground.
• DTP transparent digital processors
• the present invention has the advantages of n + p site diversity and charge sharing techniques while limiting their respective disadvantages.
• the principle of the invention is to manage the diversity for the high frequency bands (typically Q / V) by the transparent digital DTP processors of the satellites, and to combine the n + p site diversity and the load sharing diversity according to the system load so as not to introduce additional sites (on the ground) or antenna sources and associated RF chains (onboard satellites).
• n + p diversity is managed by modifying the channels of a DTP transparent digital processor on a specific date and synchronized with the ground segment (or Hub).
• Load-sharing diversity is managed through the flexibility and routing mechanisms offered by the transparent digital processors DTP (the carriers of two gateways are routed to the same spot).
• FIGS. 6 and 7 show a system for managing the telecommunication data traffic of a very high-level communication system. Satellite throughput, respectively for the forward payload and the return payload, according to one aspect of the invention.
• Figure 6 shows the forward or "forward" channel in English on board the satellite. It has N + p sources antennas, which are then filtered, amplified and converted into frequency before being routed in the DTP.
• the N-6 + 1 gateways GW6, GW7, ... GWN are not used during this first period P1 of implementation of the system.
• the N-6 + 1 gateways GW6, GW7, ... GWN become one after the other of the nominal gateways, depending on the deployment of new GW gateways to ensure the scalability of the system ( new users are using this system and therefore require more tape).
• the diversity gateways during the third period P3 the p gateways of diversities during the first and second periods P1 and P2 instantly become nominal gateways (n goes from N to N + p).
• Figure 7 shows the return channel or "return” in English on board the satellite. It has N sources antennas, which are then filtered, amplified, re-filtered and converted into frequency before being routed in the DTP.
• the N-6 + 1 gateways GW6, GW7, ... GWN are not used during this first period P1 of implementation of the system.
• the N-6 + 1 gateways GW6, GW7, ... GWN become one after the other of the nominal gateways, depending on the deployment of new GW gateways to ensure the scalability of the system ( new users are using this system and therefore require more tape).
• the diversity gateways during the third period P3 the p gateways of diversities during the first and second periods P1 and P2 instantly become nominal gateways (n goes from N to N + p).

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• 2019
  • 2019-03-19 US US17/054,502 patent/US11336365B2/en active Active
  • 2019-03-19 CA CA3100097A patent/CA3100097A1/en active Pending
  • 2019-03-19 WO PCT/EP2019/056780 patent/WO2019219275A1/fr active Application Filing
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