CN106253964A - Mobile communication system based on Constellation of Low Earth Orbit Satellites network and method - Google Patents
Mobile communication system based on Constellation of Low Earth Orbit Satellites network and method Download PDFInfo
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- CN106253964A CN106253964A CN201510374600.9A CN201510374600A CN106253964A CN 106253964 A CN106253964 A CN 106253964A CN 201510374600 A CN201510374600 A CN 201510374600A CN 106253964 A CN106253964 A CN 106253964A
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- 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
- H04B7/195—Non-synchronous stations
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- 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
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- 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
- H04B7/18521—Systems of inter linked satellites, i.e. inter satellite service
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Abstract
The present invention proposes a kind of mobile communication system based on Constellation of Low Earth Orbit Satellites network, including at least one low orbit satellite, provides the user narrow band communication based on L/S wave band and broadband connections based on Ku/Ka wave band/laser；When user terminal is positioned at different satellite, described system also provides for the inter satellite link transmission between the plurality of low orbit satellite.The present invention also proposes corresponding communication means.The present invention can provide the user broadband data service in conjunction with the feature that the coverage of L/S wave band is big and Ku/Ka wave band/laser bandwidth is high.
Description
Technical field
The present invention relates to technical field of satellite communication, particularly relate to movement based on Constellation of Low Earth Orbit Satellites network and lead to
Communication system and method.
Background technology
ITU is that the working frequency range that satellite communication divides has: L, S, C, X, Ku, Ka；On this basis,
Carry out the business such as arrowband or the voice in broadband, data.Ka frequency range has available bandwidth width, and interference is few,
The advantage that equipment volume is little, is generally used for the high speed satellite communication of satellite communication system, including HDTV,
Gigabit level broadband data transmission, and individual's satellite communication field, it is adaptable to high speed data transfer business.
L, S frequency range has that frequency range is low, the feature of wide coverage, is generally used for voice or low-speed data service.
In current satellite system, broadband satellite typically uses Ku, Ka audio range frequency, such as IPStar,
Live magnitude system；Ku/Ka wave band is owing to frequency range is high, broader bandwidth, and wave beam subtended angle is less compared to S/L,
It is generally used for GEO system.Satellite laser communications is the technology that development in recent years is got up, and laser frequency ratio is micro-
More than about 4 orders of magnitude of wave height, there is bigger bandwidth data transmission speed, had high rail, low rail to defend
Some successful techniques test of star.Satellite laser communications be generally used between satellite (GEO-GEO,
GEO-LEO etc.) and satellite and earth station between high-speed data communication.Narrow band service satellite is typically adopted
By L, S frequency range, such as iridium satellite, Globalstar, sub-magnitude system, GEO/MEO/LEO system all has extensively
General application, in low orbit satellite, Ka/Ku wave band is generally used for feeding link or inter satellite link, rather than
User link.
Broadband satellite system based on GEO, it is provided that during IP data service, due to star distance remote
(36000km), propagation delay time is big, when being applied to traditional ICP/IP protocol stack, it may appear that " flesh up pipe
Road " problem.The reception window buffering generally 64KB of TCP, and transmitted in both directions time delay reaches 500～600ms,
Handling capacity end to end is caused to be limited in about 1Mbps.So, in the IP broadband services of GEO, one
As all TCP/IP can be carried out adaptive optimization or transformation, by adjusting the means such as window, selective acknowledgment,
Solve this transmission bottleneck problem.Such algorithm, patent also have a lot.LEO system is run track and is existed
Between 800～1400km, its transmitted in both directions time delay is only 10～50ms, there is not handling up of above-mentioned TCP/IP
Amount problem.
Summary of the invention
For the problems referred to above, the present invention proposes a kind of mobile communication system based on Constellation of Low Earth Orbit Satellites network,
It is based on L/S wave band narrow that described system includes that at least one low orbit satellite, described low orbit satellite provide the user
Band communication and broadband connections based on Ku/Ka wave band/laser.
Preferably, when user terminal is positioned at different satellite, described system also provides for the plurality of low orbit satellite
Between inter satellite link transmission.
Further, described low orbit satellite includes: arrowband module, for providing wireless access for user terminal；
Realize narrow band service；Monitoring system business also receives and dispatches signaling；User exact position is indicated for broadband beams, and
Dynamically distribution is realized according to user's request；Wideband module, is used for providing broadband services, according to described arrowband mould
The signaling of block carries out broadband services networking, and broadband beams Real-time and Dynamic is pointed to user terminal；Inter satellite link mould
Block is for providing base for described narrow band communication module and described broadband communicating module between described low orbit satellite
Transparent transmission in base band.Further, described Wideband module is closed when no user business.
Preferably, described Constellation of Low Earth Orbit Satellites network provides Global coverage based on L/S wave band.
Preferably, described system also includes ground network administrative center, is used for according to teleservice, really
Surely form the satellite list of space propagation subnet, and indicate described low orbit satellite to set up described space propagation
Net.It is additionally operable to the topology at the described space propagation subnet of maintenance of described space propagation subnet duration, specifically
Including: after described satellite switches with track motion, change described space propagation subnet topology, notice
Described space propagation subnet change link layer parameter, completes the satellite switching of user's switching and subnet.It is additionally operable to
According to service conditions, described low orbit satellite is indicated to close its Wideband module.
According to identical design, the present invention also proposes a kind of mobile communication side based on Constellation of Low Earth Orbit Satellites network
Method, including: described Constellation of Low Earth Orbit Satellites network provide the user narrow band communication based on L/S wave band and based on
The broadband connections of Ku/Ka wave band/laser；The operation collaborative with broadband connections of described narrow band communication.
Preferably, described collaborative operation includes: described narrow band communication is responsible for signalling and guiding, by narrow
The networking of broadband data service is completed with signaling；Described broadband connections completes broadband by the guide of narrow band communication
The transmission of data service.Described narrow band communication based on L/S wave band is used for providing wireless access for user terminal,
Voice, short data and the transmission of signaling are provided；Described broadband connections based on Ku/Ka wave band/laser is used for
Provide the user wideband data transmission.
Preferably, user accesses Constellation Network by described narrow band communication, obtains from ground network administrative center
IP parameter；User sends broadband data service transmission request by narrow band communication, and described transmission request is forwarded
To floor control center, floor control center addresses other-end or data forwarding channel according to business information,
Determining the satellite list of space propagation subnet, the satellite in list sends networking request；Receive described networking
The satellite of request opens Wideband module, controls its inter satellite link module, its in described space propagation subnet
His satellite sets up base band transparent transmission channel.
Preferably, when needs carry out paging to terminal, narrow band communication based on S/L is used to carry out paging,
The exact position of instruction terminal.
Preferably, when forwarding when there being data to need, the satellite in described space propagation subnet is according to described satellite
List, calculates the forwarding route of packet, sets up converting route on star.
Preferably, broadband beams is pointed in service process by the serving satellite of described terminal by narrow band information
Adjust in real time, described terminal is tracked.When described serving satellite flies away from terminal, described terminal
It is switched to the next one and crosses top satellite.
Preferably, described space propagation Subnet List is adjusted by described floor control center, described space
Each satellite update routing table of transmission subnet, and packet is switched to new route forwards.When described
When satellite in space propagation subnet switches, defending of service is exited in the instruction of described ground network administrative center
Star closes its Wideband module.
Preferably, described narrow band communication technology based on L/S wave band includes but not limited to: TDMA, FDMA
And CDMA；Broadband communications technologies based on Ku/Ka wave band includes but not limited to: DVB-S2/DVB-RCS.
Preferably, described Constellation of Low Earth Orbit Satellites network provides Global coverage based on L/S wave band.
The present invention combines Ka/Ku/ laser broadband and the advantage of L/S arrowband satellite and feature: LEO Satellite
Propagation delay time is low, can be with conventional TCP protocols seamless combination；And combine the coverage of L/S wave band
Big and that Ku/Ka wave band/laser bandwidth is high feature, provides the user broadband data service.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to enforcement
In example or description of the prior art, the required accompanying drawing used is briefly described, it should be apparent that, retouch below
Accompanying drawing in stating is some embodiments of the present invention, for those of ordinary skill in the art, is not paying
On the premise of creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the mobile communication system schematic diagram that the embodiment of the present invention 1 proposes；
Fig. 2 is the point-to-point communication application scenarios schematic diagram of the mobile communication system that the present invention proposes；
Fig. 3 is the point-to-point configuration application scenarios schematic diagram of the mobile communication system that the present invention proposes；、
Fig. 4 is Star Network (Star) the application scenarios schematic diagram of the mobile communication system that the present invention proposes；
Fig. 5 is the Mesh network application scenarios schematic diagram of the mobile communication system that the present invention proposes；
Fig. 6 is the mobile communication system schematic diagram of the embodiment of the present invention 2；
Fig. 7 is the embodiment of the present invention 2 middle width strip communication protocol stack schematic diagram.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the present invention
Accompanying drawing in embodiment, is clearly and completely described the technical scheme in the embodiment of the present invention, it is clear that
Described embodiment is a part of embodiment of the present invention rather than whole embodiments；It should be noted that
In the case of not conflicting, the embodiment in the application and the feature in embodiment can be mutually combined.Based on
Embodiment in the present invention, those of ordinary skill in the art are obtained under not making creative work premise
Every other embodiment, broadly fall into the scope of protection of the invention.
The present invention proposes a kind of mobile communication system based on Constellation of Low Earth Orbit Satellites network, described system include to
A few low orbit satellite, described low orbit satellite provide the user narrow band communication based on L/S wave band and based on
The broadband connections of Ku/Ka wave band/laser.
Preferably, when user terminal is positioned at different satellite, described system also provides for the plurality of low orbit satellite
Between inter satellite link transmission.
Further, described low orbit satellite includes: arrowband module, for providing wireless access for user terminal；
Realize narrow band service；Monitoring system business also receives and dispatches signaling；User exact position is indicated for broadband beams, and
Dynamically distribution is realized according to user's request；Wideband module, is used for providing broadband services, according to described arrowband mould
The signaling of block carries out broadband services networking, and broadband beams Real-time and Dynamic is pointed to user terminal；Inter satellite link mould
Block is for providing base for described narrow band communication module and described broadband communicating module between described low orbit satellite
Transparent transmission in base band.Further, described Wideband module is closed when no user business.
Preferably, described system also includes ground network administrative center, is used for according to teleservice, really
Surely form the satellite list of space propagation subnet, and indicate described low orbit satellite to set up described space propagation
Net.It is additionally operable to the topology at the described space propagation subnet of maintenance of described space propagation subnet duration, specifically
Including: after described satellite switches with track motion, change described space propagation subnet topology, notice
Described space propagation subnet change link layer parameter, completes the satellite switching of user's switching and subnet.It is additionally operable to
According to service conditions, described low orbit satellite is indicated to close its Wideband module.
According to identical design, the present invention also proposes a kind of mobile communication side based on Constellation of Low Earth Orbit Satellites network
Method, including: described Constellation of Low Earth Orbit Satellites network provide the user narrow band communication based on L/S wave band and based on
The broadband connections of Ku/Ka wave band/laser；The operation collaborative with broadband connections of described narrow band communication.
Preferably, described collaborative operation includes: described narrow band communication is responsible for signalling and guiding, by narrow
The networking of broadband data service is completed with signaling；Described broadband connections completes broadband by the guide of narrow band communication
The transmission of data service.Described narrow band communication based on L/S wave band is used for providing wireless access for user terminal,
Voice, short data and the transmission of signaling are provided；Described broadband connections based on Ku/Ka wave band/laser is used for
Provide the user wideband data transmission.
Preferably, user accesses Constellation Network by described narrow band communication, obtains from ground network administrative center
IP parameter；User sends broadband data service transmission request by narrow band communication, and described transmission request is forwarded
To floor control center, floor control center addresses other-end or data forwarding channel according to business information,
Determining the satellite list of space propagation subnet, the satellite in list sends networking request；Receive described networking
The satellite of request opens Wideband module, controls its inter satellite link module, its in described space propagation subnet
His satellite sets up base band transparent transmission channel.
Preferably, when needs carry out paging to terminal, narrow band communication based on S/L is used to carry out paging,
The exact position of instruction terminal.
Preferably, when forwarding when there being data to need, the satellite in described space propagation subnet is according to described satellite
List, calculates the forwarding route of packet, sets up converting route on star.
Preferably, broadband beams is pointed in service process by the serving satellite of described terminal by narrow band information
Adjust in real time, described terminal is tracked.When described serving satellite flies away from terminal, described terminal
It is switched to the next one and crosses top satellite.
Preferably, described space propagation Subnet List is adjusted by described floor control center, described space
Each satellite update routing table of transmission subnet, and packet is switched to new route forwards.When described
When satellite in space propagation subnet switches, defending of service is exited in the instruction of described ground network administrative center
Star closes its Wideband module.
Preferably, described narrow band communication technology based on L/S wave band includes but not limited to: TDMA, FDMA
And CDMA；Broadband communications technologies based on Ku/Ka wave band includes but not limited to: DVB-S2/DVB-RCS.
Present invention narrow band communication based on L/S wave band, it is provided that the covering of global range, and relative industry
Business speed is relatively low, suitably transmits voice, short data, signaling etc.；Broadband connections based on Ka/Ku/ laser,
In low orbit height, higher rail (GEO) system, link budget can be saved, it is easier to offer broadband number
According to communication, but wave beam subtended angle is little, and coverage is less, and the difficulty doing continuous Ku/Ka wave cover is the biggest.
Based on These characteristics, maintaining LEO Satellite height constant, user first passes through L/S wave band access system,
And (IP/MAC/ eats dishes without rice or wine parameter to obtain the relevant parameter of Ku/Ka/ laser broadband business and configuration by this system
Deng), when having broadband services demand, sending signaling by narrow band communication, it is logical that broadband data transmission is set up in request
Road (such as Internet, VPN etc.) or subnet (such as IP subnet).In satellite system, according to user's
Narrow band signalling, by inter satellite link, forms a transmission subnet by the multi-satellite in Constellation of Low Earth Orbit Satellites,
Inter satellite link carries out base band transparent forwarding, thus provides the user a broadband data transmission business/network.
Embodiment 1: mobile communication system based on Constellation of Low Earth Orbit Satellites network
Referring to Fig. 1, described mobile communication system includes: ICBM SHF satellite terminal 1, low orbit satellite 2, inter satellite link
5 and be positioned at the network management center 6 on ground, its medium and low earth orbit satellites 2 provides Ku/KA/ laser as depicted
Broadband beams 3 and L/S narrow-band beam 4.
The IP application scenarios that this system can be supported, as shown in Fig. 2～Fig. 5, includes but not limited to: point-to-point
Communication, point-to-point configuration communication, Star Network (Star) communication, Mesh network communication.
Embodiment 2
1), in system as shown in Figure 6,1,2,3 are respectively terminal 1, terminal 2 and terminal 3,4 is
Low orbit satellite, 5 is inter satellite link, and 6 is ground network administrative center, and 7 is S/L narrow-band beam, and 8 are
Ku/Ka/ laser broadband wave beam.
Narrow band communication based on L/S can use the many generals such as TDMA, FDMA, CDMA or
Special standard；Broadband connections based on Ku/Ka can use DVB-S2/DVB-RCS or other standards.
Assume at Ka wave band, up use DVB-RCS, descending use DVB-S2, ICBM SHF satellite terminal broadband services
Module supports the encapsulation to IP and forward process.
2) satellite constellation supports Global coverage, and all terminal initials pass through S/L narrow-band beam access network；
3) terminal 1 broadband data service to be used, first passes through S/L narrow band signalling and service request is turned
Issue ground network administrative center；
Broadband services is divided into two kinds, and one is data access service, such as access ground Internet network or
Person ground dedicated network；One is Satellite subnetwork, the virtual subnet of multiple ICBM SHF satellite terminals composition；
4) according to terminal traffic attribute, ground network administrative center determines that Aerospace Satellite transmits Subnet List.
For data access business, terminal data bag forwards gateway station by inter-satellite link；For satellite
Network service, ground network administrative center determines the satellite list at the terminal place with terminal 1 same subnet, so
Rear transmission networking is asked to all satellites in list；
5) after satellite receives broadband data service request, distribute broadband resource, open broadband beams, and defend
Star terminal networking；When needing paging terminal, use S/L narrow-band communications links to carry out paging, indicate terminal
Exact position, it is simple to Ka wave beam follow the tracks of.Satellite, according to transmission Subnet List, calculates the forwarding of packet
Route, sets up forward table on star.Forward route may need to get to target satellite through multi-hop.
6) data forwarding process: UT supports IP protocol stack and DVB protocol stack, receives IP from PC side
Bao Hou, is sent to DVB protocol stack, IP bag uses MPE encapsulation, then carries out MPEG2TS and tear open
Point, mutual with satellite through air interface；Satellite Ka signal of terminal use being eated dishes without rice or wine is demodulated, and recovers
For base band data, according to forward table, base band data is transparently forwarded to down hop satellite；Down hop satellite pair
These data carry out link layer forwarding.
7) just constitute IP subnet between multiple ICBM SHF satellite terminals, can carry out data transmission, use with ground
There is no difference.
8) serving satellite of terminal is in service process, and broadband beams is adjusted in real time, carries out user
Follow the tracks of；
9), when terminal is left in serving satellite flight, terminal is switched to next satellite crossing top.During switching,
Transmission subnet is adjusted by ground network administrative center, each satellite update routing table of transmission subnet, and will
Packet is switched to new route and forwards.
In above-described embodiment, satellite supports narrow band service based on L/S and width based on Ku/Ka/ laser simultaneously
Band business.Narrow band communication and the collaborative operation of broadband connections, narrow band communication is responsible for signalling and guiding, is utilized
The coverage advantage of narrow band service makes up the shortcoming that the coverage of broadband connections is little, by the signaling of L/S
Complete the networking of Ku/Ka/ laser data business；Ku/Ka/ laser provides broadband data transmission business.Satellite
Communication payload supports to support between base band exchange, and satellite inter satellite link, enables user data at satellite
Base band forwarding is carried out between subnet；Network topology is managed by ground network administrative center, supports broadband number
According to networking maintenance and terminal mobility management.When satellite motion leaves user, and user link switches,
Ground network administrative center and Onboard switching module change satellite transmission subnet link layer route, it is ensured that number of users
According to seamless switching.
By above example it can be seen that it is an advantage of the current invention that:
When 1, using low orbit satellite to provide IP broadband services, star ground propagation delay time is little, it is not necessary to TCP
Agreement is transformed, it is not necessary to use special protocol adaptation equipment, and the business that simplifies uses pattern；
2, low orbit is compared with high orbit, and from 800km to 36000km, link budget can save tens
Individual dB, can be used for improving signal quality or saving power on star；
3, advantage 1 and the acquisition of advantage 2, has no effect on bandwidth and the system of users of customer service
Continuous service experience.Compared to GEO/MEO system, L/S arrowband constellation systems can accomplish whole world nothing
Seam covers, and GEO system can only cover 1/3rd areas, and for high latitude area covering power relatively
Difference；L/S system then can accomplish Global coverage, and the broadband services being equivalent to extend Ku/Ka/ laser covers
Scope.
One of ordinary skill in the art will appreciate that: all or part of step realizing said method embodiment can
Completing with the hardware relevant by programmed instruction, aforesaid program can be stored in an embodied on computer readable and deposit
In storage media, this program upon execution, performs to include the step of said method embodiment；And aforesaid storage
Medium includes: the various media that can store program code such as ROM, RAM, magnetic disc or CD.
Last it is noted that above example is only in order to illustrate technical scheme, rather than it is limited
System；Although the present invention being described in detail with reference to previous embodiment, those of ordinary skill in the art
It is understood that the technical scheme described in foregoing embodiments still can be modified by it, or to it
Middle part technical characteristic carries out equivalent；And these amendments or replacement, do not make appropriate technical solution
Essence departs from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (22)
1. a mobile communication system based on Constellation of Low Earth Orbit Satellites network, described system includes at least one
Low orbit satellite, it is characterised in that described low orbit satellite provide the user narrow band communication based on L/S wave band and
Broadband connections based on Ku/Ka wave band/laser.
System the most according to claim 1, it is characterised in that when user terminal is positioned at different satellite
Time, described system also provides for the inter satellite link transmission between the plurality of low orbit satellite.
System the most according to claim 2, it is characterised in that described low orbit satellite includes arrowband mould
Block, Wideband module and inter satellite link module；
Described arrowband module is for providing wireless access for user terminal；Realize narrow band service；Monitoring system industry
It is engaged in and receives and dispatches signaling；Indicate user exact position for broadband beams, and realize dynamically distribution according to user's request；
Described Wideband module is used for providing broadband services, carries out broadband services according to the signaling of described arrowband module
Networking, points to user terminal by broadband beams Real-time and Dynamic；
Described inter satellite link module for for described narrow band communication module and described broadband communicating module described
Transparent transmission based on base band is provided between low orbit satellite.
System the most according to claim 3, it is characterised in that described Wideband module is in no user industry
Close during business.
System the most according to claim 2, it is characterised in that also include ground network administrative center,
Described ground network administrative center is for according to teleservice, determining composition space propagation subnet
Satellite list, and indicate described low orbit satellite to set up described space propagation subnet.
System the most according to claim 5, it is characterised in that described ground network administrative center is also
For safeguarding the topology of described space propagation subnet in the described space propagation subnet duration, specifically include:
After described satellite switches with track motion, change described space propagation subnet topology, notify institute
State space propagation subnet change link layer parameter, complete the satellite switching of user's switching and subnet.
System the most according to claim 5, it is characterised in that described ground network administrative center is also
For according to service conditions, described low orbit satellite is indicated to close its Wideband module.
8. according to the system described in claim 1～7 any one, it is characterised in that described low orbit satellite
Constellation Network provides Global coverage based on L/S wave band.
9. a method of mobile communication based on Constellation of Low Earth Orbit Satellites network, it is characterised in that including: described
Constellation of Low Earth Orbit Satellites network provide the user narrow band communication based on L/S wave band and based on Ku/Ka wave band/swash
The broadband connections of light；The operation collaborative with broadband connections of described narrow band communication.
Method the most according to claim 9, it is characterised in that described collaborative operation includes: described
Narrow band communication is responsible for signalling and guiding, is completed the networking of broadband data service by narrow band signalling；Described
Broadband connections completes the transmission of broadband data service by the guide of narrow band communication.
11. methods according to claim 10, it is characterised in that defend when user terminal is positioned at difference
During star, described Constellation Network also provides for the inter satellite link transmission between the plurality of low orbit satellite.
12. methods according to claim 11, it is characterised in that described based on L/S wave band narrow
Band communication is for providing wireless access for user terminal, it is provided that the transmission of voice, short data and signaling；Described
Broadband connections based on Ku/Ka wave band/laser is used for providing the user wideband data transmission.
13. methods according to claim 12, it is characterised in that including:
User accesses Constellation Network by described narrow band communication, obtains IP parameter from ground network administrative center
User sends broadband data service transmission request by narrow band communication, and described transmission request is forwarded to ground
Face administrative center, floor control center, according to business information addressing other-end or data forwarding channel, determines
The satellite list of space propagation subnet, the satellite in list sends networking request；
The satellite receiving described networking request opens Wideband module, controls its inter satellite link module, to described sky
Between other satellites of transmitting in subnet set up base band transparent transmission channel.
14. methods according to claim 13, it is characterised in that described IP parameter includes but do not limits
In: IP address, subnet parameter, service priority and/or service bandwidth.
15. methods according to claim 13, it is characterised in that also include: when needs are to terminal
When carrying out paging, narrow band communication based on S/L is used to carry out paging, the exact position of instruction terminal.
16. methods according to claim 13, it is characterised in that also include: when there being data needs
During forwarding, the satellite in described space propagation subnet, according to described satellite list, calculates the forwarding road of packet
By, set up converting route on star.
17. methods according to claim 13, it is characterised in that the serving satellite of described terminal exists
In service process by narrow band information to broadband beams point to adjust in real time, described terminal is carried out with
Track.
18. methods according to claim 17, it is characterised in that also include: when described service is defended
When star flies away from terminal, described terminal is switched to the next one and crosses top satellite.
19. methods according to claim 13, it is characterised in that also include: when described space passes
When satellite in defeated subnet switches, described space propagation Subnet List is carried out by described floor control center
Adjust, each satellite update routing table of described space propagation subnet, and packet is switched to new route enters
Row forwards.
20. methods according to claim 19, it is characterised in that also include: when described space passes
When satellite in defeated subnet switches, the instruction of described ground network administrative center is exited the satellite of service and is closed
Its Wideband module.
21. methods according to claim 9, it is characterised in that described arrowband based on L/S wave band
Communication technology includes but not limited to: TDMA, FDMA and CDMA；Based on Ku/Ka wave band/laser
Broadband communications technologies includes but not limited to: DVB-S2/DVB-RCS.
22. according to the method described in claim 9～21 any one, it is characterised in that described low rail is defended
Star Constellation Network provides Global coverage based on L/S wave band.
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106850034A (en) * | 2017-02-20 | 2017-06-13 | 上海微小卫星工程中心 | Low orbit satellite data transmission system |
| CN106888047A (en) * | 2017-02-20 | 2017-06-23 | 上海微小卫星工程中心 | Low orbit satellite data transmission method |
| CN108337041A (en) * | 2018-04-20 | 2018-07-27 | 宁波光舟通信技术有限公司 | A kind of vehicular communication system |
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