CN106612139A - Method for coexistence of multiple satellite mobile communication systems - Google Patents
Method for coexistence of multiple satellite mobile communication systems Download PDFInfo
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- CN106612139A CN106612139A CN201510708489.2A CN201510708489A CN106612139A CN 106612139 A CN106612139 A CN 106612139A CN 201510708489 A CN201510708489 A CN 201510708489A CN 106612139 A CN106612139 A CN 106612139A
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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
- H04B7/1853—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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- Aviation & Aerospace Engineering (AREA)
- General Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Relay Systems (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The present invention provides a method for coexistence of multiple satellite mobile communication systems. A satellite mobile communication system B is set at the same band of a satellite mobile communication system A. The method comprises the steps that the satellite mobile communication system B builds a transmission channel by using a broadband spread spectrum technology; a communication signal between a satellite and a ground terminal and spectrum sensing results of a forward channel and a reverse channel are transmitted by using the transmission channel; and spectrum resources are configured or adjusted in real time by using the communication signal according to the spectrum sensing results. Through adoption of the method, the newly built satellite mobile communication system and an existing satellite mobile communication system can coexist under the condition of no harmful interference, so that a major problem of building of the new system is solved.
Description
Technical field
The present invention relates to field of satellite mobile communication, more particularly to a kind of satellite mobile communication condition of multi-system coexistence
Method.
Background technology
The frequency spectrum resource for being adapted to carry out Global Satellite mobile communication is very limited, with satellite mobile communication demand
Increase, frequency spectrum resource contradiction in short supply, in addition become restriction satellite mobile communication development master
Want bottleneck.Existing satellite mobile communication system design is most to adopt the pattern that radio frequency is forwarded on star, this side
Although formula simplifies the design of space segment, but as signal processing means are single, can only be provided using exclusive frequency
The mode in source carries out the deployment of satellite mobile communication system.Iridium satellite is the low of Base-Band Processing on only employing star
Rail mobile communication constellation systems, multi-access mode of its air interface using TDMA, this design are still needed
Frequency resource to be monopolized.
According to the radio regulation(s) that ITU is formulated, the suitable development that can be used alone has been can not find at present complete
The frequency resource of ball satellite mobile communication service, using traditional frequency isolation, time isolation or spatial separation
It also is difficult to realize coexisting between different satellite mobile communication systems.
Satellite mobile communication is in the neck such as emergency repair, process local accident and navigation and aviation safety guarantee
Domain plays irreplaceable important function.Satellite mobile communication carries the important mission of national security, together
When satellite mobile communication, particularly low orbit satellite mobile communication system constellation systems again with Global coverage attribute,
Therefore build satellite mobile communication network demand covering the whole world urgent.But by frequency spectrum resource system covering the whole world
About, new satellite mobile communication system of building is difficult to find the frequency resource not used, frequency spectrum resource into
Distinct issues the most are built for new system.
In the radio regulation(s) that ITU is formulated, it is allowed to interference less than thermal noise power 6% outside system, i.e.,
Other communication system signals for allowing less than thermal noise power 6% enter existing satellite mobile communication system.
With developing rapidly for electronic technology, particularly integrated circuit technique, had using complex system design
There is the probability of Project Realization.Satellite mobile communication is mainly used in emergency repair, processes local burst at present
Event and the field such as navigation and aviation safety guarantee, form and cover complementary situation with land mobile communication.Cause
This, in different satellite mobile communication systems, has that business is uneven, reaches the likelihood ratio of design capacity
Relatively low phenomenon, this is to be created in condition using the frequency usage cavity of finding of frequency spectrum perception technology Real-time and Dynamic.
The content of the invention
For the problems referred to above, the present invention proposes a kind of method of satellite mobile communication condition of multi-system coexistence, in satellite
The same frequency range of mobile communication system A arranges satellite mobile communication system B, including：
The satellite mobile communication system B sets up transmission channel using wideband spread spectrum techniques；By the transmission
Communication signaling and forward and reverse channel spectrum sensing results between channel transfer satellite and ground based terminal；According to institute
Frequency spectrum perception result is stated, frequency spectrum resource is configured by the communication signaling or real-time adjustment.
Further, the information of the transmission channel transmission, with satellite mobile communication system A transmission
Information configuration is in identical frequency range, and/or the information configuration with satellite mobile communication system B transmission
In identical frequency range.
Further, the radio-frequency power of the transmission channel less than thermal noise power 6%.
Further, the satellite mobile communication system B monitors the satellite mobile communication system at one's leisure
The idle carrier wave of A；Information transfer is carried out using the idle carrier wave for monitoring when having business to transmit.
Further, the satellite mobile communication system B monitors the satellite mobile communication system at one's leisure
The idle carrier wave of A, carries out information transfer using the idle carrier wave for monitoring when there is business to transmit and specifically includes：
The satellite and ground based terminal of the satellite mobile communication system B, monitors the satellite in the same frequency range and moves
The carrier wave service condition of dynamic communication system A；The satellite mobile communication system is linked up by the transmission channel
The front/rear carrier informations used to channel of B；It is corresponding it is front/rear to channel using carrier position send/connect
The collection of letters number.
Further, also include：It is in the transmission frame of the satellite mobile communication system B, dry using leaving and taking
The mode of observation time window is disturbed, real-time Interference Detection in message transmitting procedure is carried out.
Further, also include：In the real-time Interference Detection, if it is logical to detect the satellite movement
Letter system A and satellite mobile communication system B have used identical carrier resource, the satellite mobile communication
System B then carries out carrier resource by the transmission channel and quickly matches somebody with somebody again.
Further, when the disturbance-observer time window takes same or different in different transmission frames
Gap position.
Further, the satellite mobile communication system A and the satellite mobile communication system B are adopted respectively
Polarization isolation is realized with circular polarisation dextrorotation antenna and the left-handed antenna of circular polarisation.
The present invention can realize the satellite mobile communication system and existing satellite mobile communication system of new construction
Coexisting under the conditions of without harmful interference, solves the key issue of new system construction.
Description of the drawings
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 implementing
Example or accompanying drawing to be used needed for description of the prior art are 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 being paid
On the premise of creative work, can be with according to these other accompanying drawings of accompanying drawings acquisition.
Fig. 1 is the spectrum diagram of system A in the embodiment of the present invention 1；
Fig. 2 be the embodiment of the present invention 1 in system A be superimposed with system B signaling-information after spectrum diagram；
Power and carrier wave distribution schematic diagram when Fig. 3 is coexisted for system A in the embodiment of the present invention 1 and system B；
Fig. 4 is system B signaling information and the shared schematic diagram with frequency range of carrier information in the embodiment of the present invention 1；
Power and carrier wave distribution schematic diagram when Fig. 5 is coexisted for A systems in the embodiment of the present invention 2 and B system；
Frame format schematic diagrams of the Fig. 6 for the B system in the embodiment of the present invention 2.
Specific embodiment
To make purpose, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the present invention
Accompanying drawing in embodiment, is clearly and completely described to the technical scheme in the embodiment of the present invention, it is clear that
Described embodiment is a part of embodiment of the invention, rather than the embodiment of whole；It should be noted that
In the case where not conflicting, the feature in embodiment and embodiment in the application can be mutually combined.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained under the premise of creative work is not made
Every other embodiment, belong to the scope of protection of the invention.
One embodiment of the present of invention proposes a kind of method of satellite mobile communication condition of multi-system coexistence, moves in satellite
The same frequency range of dynamic communication system A arranges satellite mobile communication system B, including：The satellite mobile communication system
System B sets up transmission channel using wideband spread spectrum techniques；By the transmission channel transmitting satellite and ground based terminal
Between communication signaling and forward and reverse channel spectrum sensing results；According to the frequency spectrum perception result, by institute
State communication signaling to configure frequency spectrum resource or real-time adjustment.
In one alternate embodiment, the information of transmission channel transmission, with the satellite mobile communication system A
The information configuration of transmission is in identical frequency range, and/or the letter with satellite mobile communication system B transmission
Breath is configured in identical frequency range.
In one alternate embodiment, the radio-frequency power of transmission channel less than thermal noise power 6%.
In one alternate embodiment, satellite mobile communication system B monitors the satellite movement at one's leisure and leads to
The idle carrier wave of letter system A；Information transfer is carried out using the idle carrier wave for monitoring when having business to transmit.
In one alternate embodiment, satellite mobile communication system B monitors the satellite movement at one's leisure and leads to
The idle carrier wave of letter system A, carries out information transfer tool using the idle carrier wave for monitoring when there is business to transmit
Body includes：The satellite and ground based terminal of the satellite mobile communication system B, monitors institute in the same frequency range
State the carrier wave service condition of satellite mobile communication system A；The satellite movement is linked up by the transmission channel
The front/rear carrier information used to channel of communication system B；In the corresponding front/rear carrier wave position used to channel
Put transmission/reception signal.
In one alternate embodiment, also include：In the transmission frame of the satellite mobile communication system B,
By the way of disturbance-observer time window is left and taken, real-time Interference Detection in message transmitting procedure is carried out.
In one alternate embodiment, also include：In the real-time Interference Detection, if detected described
Satellite mobile communication system A and satellite mobile communication system B have used identical carrier resource, described to defend
Star mobile communication system B then carries out carrier resource by the transmission channel and quickly matches somebody with somebody again.
In one alternate embodiment, the disturbance-observer time window takes identical in different transmission frames
Or different time slot positions.
In one alternate embodiment, satellite mobile communication system A and satellite mobile communication system B difference
Polarization isolation is realized using circular polarisation dextrorotation antenna and the left-handed antenna of circular polarisation.
The various embodiments described above adopt wide-band spread spectrum communication system, design to lead to less than the signaling of noise power 6%
Road, transmits the communication system necessary signaling of work and forward and reverse channel spectrum sense between satellite and ground based terminal
The result known, according to the result of frequency spectrum perception, accomplishes the real-time adjustment of frequency spectrum resource using signaling channel, from
And realize that different satellite mobile communication systems are coexisted in the band of same frequency resources.
Embodiment 1
Current many GMR-1 or GMR-2 protocol architectures of existing satellite mobile communication system, the agreement are adopted
The multi-access mode of FDMA/TDMA, the requirement of general its C/N are above 5dB.If existing satellite is moved
Dynamic communication system is system A, if it is system B to need with the new system that system A coexists.The frequency of system A
Spectrum is as shown in Figure 1., by the way of wide-band spread spectrum, on the frequency spectrum of system A, superposition one is low for the present embodiment
The signaling-information (dotted line is represented) of system B that the employing spread spectrum mode of power spectral density is launched, two signals
Shown in frequency spectrum Fig. 2 after superposition.
According to the radio regulation(s) that ITU is formulated, as long as the signal power of superposition is less than the 6% of thermal noise,
It is treated as the permission signal power not interfered to original system A.The system B signal C/N being superimposed
To be less than -12.2dB.It is one dry the system B signaling-information being superimposed to be received in view of original system a-signal
Disturb signal, and the high 5dB of strength ratio thermal noise of this signal, then using wide-band spread spectrum system B C/I
For -18dB.If using 512 times of spread spectrum, spreading gain is up to 27dB, after so de-spreading is
The SNR of system B will be up to 9dB.After considering that despreading is paid no attention to and thinks of and leave certain engineering surplus, this
The extremely weak system B signaling-information of superposition possesses the ability of transmission signaling.
, after with most basic interference-free signalling ability, satellite and ground based terminal can for system B
To detect the idle carrier wave not used respectively in the band limits of system A, and before and after being carried out by signaling
The information communication of concrete carrier wave, corresponding system B receiver is used to receive in specified carrier position to channel
Signal, as shown in Figure 3.The carrier wave that wherein carrier wave of dotted line is not taken for system A that system B finds
By signaling channel, position, notifies that recipient receives signal at this carrier wave.
System B can be specially to reserve disturbance-observer time window in the frame format of oneself, and this disturbs
Whether observation window can slide in different time slots, for observation system A using this carrier wave, when being
When system B monitors that system A takes this carrier wave, system B can enter line frequency by signaling channel immediately
The quick of resource is matched somebody with somebody again, purpose is not coexisted by under harmful disturbed condition so as to reach two systems.
System B can also be with oneself system with FDMA side using the signaling information of wide-band spread spectrum system transmission
The information configuration of formula transmission in identical frequency range, as shown in Figure 4.Certainly, in actual system design,
Can be according to particular situations such as frequency spectrum resource, signal transmission power, user density, using different configurations.
Embodiment 2
The satellite mobile communication system of maximum covering the whole world at present is Inmarsat, is advised according to ITU radio
Then, its frequency range that can be used is：To satellite 1626.5-1660.5MHz, satellite is to ground on ground：
1525-1559MHz；In addition, Inmarsat on the ground of WRC-03 newly extensions to satellite 1668-1675MHz,
Satellite has also transmitted satellite to ground 1518-1525MHz frequency ranges.In this case, increase satellite newly to move
Dynamic communication system will realize that Global coverage is faced with the available predicament of no frequency resource.Ground is arrived with satellite
As a example by downlink design, actual available frequency resource is 1518-1559MHz, altogether bandwidth 41MHz.
If Inmarsat satellite mobile communication systems are A, intend moving in the satellite that same frequency range coexists with Inmarsat
Dynamic communication system is B.
The signaling of B system adopts 512 times of spread spectrum, and after spread spectrum, signal occupied bandwidth is 5MHz, spreads and increases
Benefit is 27dB.According to the regulation that M.1183 ITU-R is coexisted with band frequency, the transmission power of other systems
The 6% of thermal noise is should be less than, i.e. the C/N0 of B system signaling channel is up to -12.2dB.Signaling channel solution
Pitch limit is designed as SNR=4dB, then the design margin of signaling channel is -12.2+27-4=10.8dB, and this sets
Meter surplus can meet satellite mobile communication system engineering design requirements completely.
In view of the FDMA systems that already present A systems are frequency interval 200KHz, 41MHz's
205 carrier frequency are had in band limits, A systems carry out networking by frequency reuse 4.Newly-designed B
System in order to preferably with existing A coexistence of systems, design carrier bandwidths be not more than 200KHz.
The 5MHz bandwidth of 1518-1523MHz is configured in using the B system signaling channel that spread spectrum mode sends
Interior, the terminal of B system searches for the idle carrier wave of A systems in the range of 41M, when there is business to transmit,
The idle carrier wave that utilizes of Real-time and Dynamic carries out information transfer.Power and carrier wave point when A systems are coexisted with B system
It is as shown in Figure 5 with relation schematic diagram.
The frame length of B system is designed as 10 milliseconds, and frame format design is as shown in fig. 6, wherein DT is interference inspection
Time window is surveyed, the B system not sending signal in this time window.In order to ensure to FDAM/TDMA's
A system not missing inspections, DT take different time slot positions in different frames, as taken TS0 in the 0th frame
Position, takes the position of TS1, by that analogy, continuous circulating repetition in the 1st frame.
Find have interference level increase by detection time window DT when B system transmission services, then show A
System occupies the carrier wave of correlation, and the signaling channel by spread spectrum is notified communication payload on star by B system terminal
Change carrier wave.The frame length of B system is 10 milliseconds, notifies communication payload on star from finding that A systems take to
Change carrier wave most to complete in two frame times soon, i.e., quickly matching somebody with somebody again for carrier frequency resources can be in tens millis
The order of magnitude of second is completed, and now the interference to A systems is very limited, M.1183 regular according to ITU-R,
Within the range of permission.
If 20% idle carrier wave can be found in A systems, will imply that and can find 8MHz bandwidth
Frequency resource for used by B system, the capacity of such B system just has practical value.
A system antennas are designed with circular polarisation dextrorotation, and B system Antenna Design is left-handed using circular polarisation, so
There to be at least polarization isolation of 9dB in down channel two systems, B is being met using this polarization isolation
System is to the interference of A systems less than on the premise of thermal noise 6%, it is possible to achieve B system spreading part spreads
C/N0 is promoted to -3.2dB, and this is effectively lifted the transmittability of B system spreading part spreads, makes B system exist
Most basic communication support can also be realized when merely using wide-band spread spectrum.
By the various embodiments described above as can be seen that the present invention adopts wideband spread spectrum techniques to be less than thermal noise power
6% ultra low power spectrum transmission signaling-information, is not constituted to existed system in ITU radio regulation(s)s are met
On the premise of interference, solve to set up without communication system during exclusive frequency resource situation and frequency resource is quickly matched somebody with somebody again
The demand of middle signalling；When system is idle, using frequency spectrum perception technology, the situation that carrier wave is used is monitored,
By the Macro or mass analysis of multiple terminals multizone monitoring result, it is to avoid monitoring blind spot；In transmission frame, adopt and stay
The mode of disturbance-observer time window is taken, real-time Interference Detection in message transmitting procedure is realized；Arrive in real-time detection
Two systems realize by any system transfers do not affected using wide-band spread spectrum using after identical carrier resource
Fast resource is matched somebody with somebody again.It is uneven in satellite business development, in the case of there is the available free surplus in more region,
Can realize condition of multi-system coexistence being realized on the premise of ITU radio regulation(s)s are met using the present invention, effectively solve
Current satellite communication system of having determined builds the difficult bottleneck of medium frequency resource coordination.
One of ordinary skill in the art will appreciate that：Realize that all or part of step of said method embodiment can
Complete with by the related hardware of programmed instruction, aforesaid program can be stored in an embodied on computer readable and deposit
In storage media, the program upon execution, performs the step of including said method embodiment；And aforesaid storage
Medium includes：ROM, RAM, magnetic disc or CD etc. are various can be with the medium of store program codes.
Finally it should be noted that：Above example is only illustrating technical scheme, rather than which is limited
System；Although being described in detail to the present invention with reference to the foregoing embodiments, one of ordinary skill in the art
It should be understood that：Which still can be modified to the technical scheme described in foregoing embodiments, or to which
Middle some technical characteristics carry out equivalent；And these modifications 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 (9)
1. a kind of method of satellite mobile communication condition of multi-system coexistence, in the same frequency of satellite mobile communication system A
Section arranges satellite mobile communication system B, it is characterised in that include：
The satellite mobile communication system B sets up transmission channel using wideband spread spectrum techniques；By the transmission
Communication signaling and forward and reverse channel spectrum sensing results between channel transfer satellite and ground based terminal；According to institute
Frequency spectrum perception result is stated, frequency spectrum resource is configured by the communication signaling or real-time adjustment.
2. method according to claim 1, it is characterised in that the information of the transmission channel transmission,
The information configuration transmitted with the satellite mobile communication system A is in identical frequency range, and/or defends with described
The information configuration of star mobile communication system B transmission is in identical frequency range.
3. method according to claim 1, it is characterised in that the radio-frequency power of the transmission channel
Less than the 6% of thermal noise power.
4. the method according to claims 1 to 3 any one, it is characterised in that the satellite movement
Communication system B monitors the idle carrier wave of the satellite mobile communication system A at one's leisure；There is business to transmit
The idle carrier wave that Shi Liyong is monitored carries out information transfer.
5. method according to claim 4, it is characterised in that the satellite mobile communication system B
The idle carrier wave of the satellite mobile communication system A is monitored at one's leisure, when there is business to transmit using monitoring
To idle carrier wave carry out information transfer and specifically include：The satellite of the satellite mobile communication system B and ground
Terminal,
The carrier wave service condition of the satellite mobile communication system A is monitored in the same frequency range；
The front/rear carrier waves used to channel of the satellite mobile communication system B are linked up by the transmission channel
Information；
It is corresponding it is front/rear send to the carrier position that channel is used/receive signal.
6. method according to claim 4, it is characterised in that also include：Move in the satellite
In the transmission frame of communication system B, by the way of disturbance-observer time window is left and taken, message transmitting procedure is carried out
In real-time Interference Detection.
7. method according to claim 6, it is characterised in that also include：In the real-time interference
In detection, if detecting the satellite mobile communication system A and satellite mobile communication system B is used
Identical carrier resource, the satellite mobile communication system B then carry out carrier resource by the transmission channel
Quickly match somebody with somebody again.
8. the method according to claim 6 or 7, it is characterised in that the disturbance-observer time window
Same or different time slot position is taken in different transmission frames.
9. method according to claim 4, it is characterised in that the satellite mobile communication system A
Circular polarisation dextrorotation antenna is respectively adopted with the satellite mobile communication system B and the left-handed antenna of circular polarisation is realized
Polarization isolation.
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| CN109756283A (en) * | 2018-12-30 | 2019-05-14 | 清华大学 | The frequency spectrum sensing method and device of GEO satellite communicating system descending link |
| CN110224739A (en) * | 2019-06-04 | 2019-09-10 | 航天科工空间工程发展有限公司 | A kind of LEO Satellite communication link frequency interferences judgment method |
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| CN109756283B (en) * | 2018-12-30 | 2020-09-04 | 清华大学 | Spectrum sensing method, device and medium for downlink of GEO satellite communication system |
| CN110224739A (en) * | 2019-06-04 | 2019-09-10 | 航天科工空间工程发展有限公司 | A kind of LEO Satellite communication link frequency interferences judgment method |
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| Publication number | Publication date |
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| CN106612139B (en) | 2020-04-07 |
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