CN113037363B - Communication system - Google Patents

Communication system Download PDF

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CN113037363B
CN113037363B CN202110531394.3A CN202110531394A CN113037363B CN 113037363 B CN113037363 B CN 113037363B CN 202110531394 A CN202110531394 A CN 202110531394A CN 113037363 B CN113037363 B CN 113037363B
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inter
satellite link
satellite
cost
modulation scheme
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CN113037363A (en
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任维佳
杨峰
杜志贵
陈险峰
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Hunan Hangxing Hanyu Space Technology Co ltd
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Hunan Hangxing Hanyu Space Technology Co ltd
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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
    • H04B7/1851—Systems using a satellite or space-based relay
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/118—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum specially adapted for satellite communication

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  • Engineering & Computer Science (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Electromagnetism (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Radio Relay Systems (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The invention relates to a communication system provided with a system for inter-satellite spatial communication, the system being configured to: the optimal effective inter-satellite link and the optimal code modulation scheme are determined by combining a plurality of pre-stored code modulation schemes of a communication system, namely a set Z, with the analysis of the operation influence characteristics of the preset channel condition and the preset transmission condition obtained by counting the channel quality of at least one effective inter-satellite link. The invention can avoid occupying part of the computing power of the satellite where the current node is positioned to calculate a new effective inter-satellite link and a new effective coding modulation scheme for the current transmission data packet so as to improve the accuracy and timeliness of the transmission information quality of the whole communication network.

Description

Communication system
The invention discloses a split application of a space communication system and a space communication method between satellites, wherein the application number is CN201910286947.6, the application date is 2019, namely 04 and 10 months, and the application type is the invention.
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a communication system.
Background
At present, the ground mobile communication infrastructure can provide good mobile communication service for the main land area, but the satellite mobile communication system (MSS) is still the only reliable choice in special conditions such as marine, aerial, remote land or extreme areas, especially in emergency and rescue and relief of heavy natural disasters, military application and the like. The satellite mobile communication system can provide mobile communication services such as voice, data, short messages and the like in a region or even a global range for users by using mobile communication satellites with different high and low orbits; the satellite mobile communication has the outstanding advantages of large coverage area, long operating distance, flexible networking, basically unrelated communication cost with distance, no limitation of the existing ground equipment, small influence of terrain and ground objects and the like. As a satellite communication system oriented to mobile communication, the main markets for satellite mobile communication include marine users, aviation users, and terrestrial users. Providing services such as high-speed data, crew communication, shipping management and the like for offshore users; providing services such as front cabin communication, track monitoring, safety service, high-speed data and the like for aviation users; communication of relevant activities such as emergency rescue, disaster relief, travel exploration and mining exploration is provided for land users. In particular, the M2M application of the satellite mobile communication system can provide vehicle and fleet management, container monitoring, oil and gas monitoring and meteorological data acquisition related services; government applications may provide communication and data services such as training and daily activities, military communications, unattended data, logistics, etc.
Global primary satellite mobile communication systems can be classified into synchronous orbital satellite mobile communication systems (high-orbit satellite mobile communication systems) and non-synchronous orbital satellite mobile communication systems (mainly low-orbit satellite mobile communication systems) according to the difference in the orbit of the satellite. Among them, the mobile communication system of the geostationary orbit satellite is represented by a maritime system, a Thuraya system, etc., and the mobile communication system of the non-geostationary orbit satellite is represented by an iridium satellite, a globalstar, an Orbcomm system, etc. In China, about 8 million satellite mobile communication users exist, and mainly include emergency communication users, maritime users and village communication users. In the aspect of emergency communication, the satellite mobile communication system plays a great role, provides a good guarantee for communication under emergency conditions, and makes great contribution to the economy and the livelihood of China.
The key technology of the mobile communication satellite technology mainly focuses on the aspects of multi-beam forming technology, on-satellite processing and switching technology and the like, and for the inter-satellite link technology: an inter-satellite link refers to a link used for communication between satellites, and is also referred to as an inter-satellite link or cross link (Crosslink). Information transmission and exchange between satellites can be realized through the inter-satellite link. A plurality of satellites are interconnected through inter-satellite links to form a space communication network with the satellites as switching nodes. For a large-scale low-orbit satellite system, due to the small information coverage area, the technology needs to realize effective control of the ground to the satellite and information interconnection between mobile users by means of an inter-satellite link technology. At present, the inter-satellite link technology can be mainly divided into two implementation modes, namely microwave communication and laser communication. The existing microwave communication technology is mainly used, the technology has the defect that the high efficiency and the practicability of a satellite mobile communication system cannot be realized due to the influence of frequency bandwidth, weight, volume, price, power consumption and the like, the laser communication mode has obvious advantages, the potential capacity of satellite communication can be effectively improved due to the ultra-wide frequency spectrum bandwidth, the satellite load volume and weight are reduced, and the information confidentiality is improved while the time delay of information transmission can be reduced.
An inter-satellite link refers to a communication link established between satellites, also referred to as an interstellar link or a cross-link. Information transmission and exchange among the satellites are realized through the inter-satellite link, a plurality of satellites can be interconnected together to form a space communication network with the satellites as exchange nodes, and dependence of a satellite communication system on a ground network is reduced. By means of the advantages of the inter-satellite link, the communication system can reduce the number of ground gateway stations, enlarge the coverage area, realize global measurement and control and the like, and signals can effectively avoid attenuation caused by atmosphere and rainfall when transmitted through the inter-satellite link, so that a relatively independent communication constellation system or a data relay system is formed.
The coding efficiency and the modulation index are the most critical factors affecting the data carrying rate in all wireless systems. The coding efficiency is high, the modulation index is large, and the natural data transmission rate is high. However, the key to the problem is that coding and modulation are greatly related to the quality of the wireless environment and the quality of the received signal, and certainly, the receiving performance of the receiver. The HSDPA realizes the function of dynamically adjusting the coding efficiency and the modulation index according to the quality of wireless signals, thereby greatly improving the throughput of the HSDPA. For example, when the CQI value is lower than 10, which indicates that the channel condition is poor, the weak is protected by more than a factor, and an 1/3 coding mode with higher redundancy and a QPSK modulation mode with lower order are adopted, and correspondingly, the data rate is lower; a CQI value greater than 20 indicates better channel conditions and more effort, and 3/4 coding schemes with less redundancy and 16QAM with higher order modulation schemes correspond to relatively higher data rates. Interference and fading in a line channel are time-varying, and a certain signal-to-noise ratio of a receiving end is maintained by dynamically adjusting forward and reverse transmitting power, so that the transmission quality of a link can be ensured. When the channel quality is poor, the transmission power is increased, and when the channel quality is good, the transmission power is decreased, thereby ensuring a constant transmission rate. Interference between users can be well avoided by adopting power control. However, the power resource is not infinite, the total transmission power of the base station is constant, and the AMC technology is used to fully utilize all the power. AMC is a rate control technique. Under the condition of ensuring that the transmitting power is constant, the transmission quality of the link is ensured by adjusting the modulation mode and the coding rate of the wireless link transmission. When the channel quality is poor, a smaller modulation mode and a lower coding rate are selected, and when the channel quality is good, a larger modulation mode is selected, so that the transmission rate is maximized.
Chinese patent (publication No. CN101860417A) discloses a method for determining modulation and coding schemes, which comprises the following steps: sending signals by different modulation and coding schemes, and adjusting the weight of each modulation and coding scheme according to the receiving quality of the sent signals; adjusting weights of the modulation and coding schemes according to suggested values of the modulation and coding schemes; and determining a modulation and coding scheme according to the weight of the modulation and coding scheme.
Chinese patent (publication number CN107508659A) discloses a self-adaptive code modulation method for inter-satellite link data transmission of a satellite navigation system, the distance between any two satellites in a constellation is measured and calculated through an inter-satellite distance measuring and calculating device, the signal-to-noise ratio of a signal received by a receiving end is estimated, a coding modulation scheme selector selects a corresponding LDPC-CPM scheme based on a target bit error rate algorithm and a ratio algorithm of throughput to bandwidth and sends the scheme to a receiver through a pilot frequency, a data signal generates a modulated signal through an LDPC code encoder, a random interleaver and a CPM modulator and sends the modulated signal to an additive white Gaussian noise channel, the pilot signal is analyzed by a code modulation scheme estimator, the data signal superposed with the additive white Gaussian noise channel noise is subjected to iterative detection by a CPM demodulator, a de-interleaver, an LDPC decoder and a random interleaver, and the LDPC decoder performs hard decision to output data. The self-adaptive coding modulation method provided by the patent can effectively improve the reliability and effectiveness of the inter-satellite self-adaptive coding modulation system.
The self-adaptive coding modulation method provided by the patent designs five coding modulation schemes with different parameters based on LDPC codes and CPM modulation, forms a coding modulation scheme library based on CPM modulation, and a coding modulation scheme selector selects a corresponding LDPC-CPM scheme based on a target bit error rate algorithm and a Throughput-bandwidth ratio (Throughput/B) algorithm. However, the coding modulation method provided by the patent does not consider that the delay sensitivities of different services to coding modulation and inter-satellite link establishment are not consistent, the coding modulation modes for all services are determined comprehensively only based on the local factor signal-to-noise ratio, and the optimal inter-satellite link path is not considered from the perspective of the whole communication network, so that the quality loss of transmitted information or the communication delay of the transmitted information can be caused.
Chinese patent (publication No. CN102571202A) discloses a laser communication link loss calculation method under a complex weather condition, which includes the following steps: establishing a simplified laser signal transmission model; establishing attenuation models under various weather conditions; establishing a power loss model; establishing a signal-to-noise ratio (SNR) model; establishing a bit error rate model; calculating a power loss numerical analysis result; calculating a signal-to-noise ratio numerical analysis result; calculating the bit error rate numerical analysis result; making a data table; and comparing the power margins. The invention applies a series of models including a transmission model, an attenuation coefficient, power loss, signal-to-noise ratio, bit error rate and the like, makes full use of the associated parameters of the attenuation coefficient to systematically combine the power loss, the signal-to-noise ratio, the bit error rate and the transmission model, introduces the typical weather condition after the meteorology definition division, and realizes the purposes of carrying out quantitative analysis on the loss of the power, the signal-to-noise ratio, the bit error rate and the like of laser communication under specific weather conditions and even intuitively judging whether a link is unblocked.
The laser communication link loss calculation method provided by the patent determines whether a laser communication link can be established or not by combining a mode considering weather conditions, and inevitably receives the influence of random media such as turbulent atmosphere on the operation of a satellite-ground link laser communication system, however, the laser communication link establishment method provided by the patent is not suitable for an inter-satellite link laser communication system, and because the inter-satellite link laser communication system does not generally pass through the atmosphere but is compiled outside the atmosphere to form an inter-satellite communication network, the inter-satellite communication network is hardly influenced by atmospheric attenuation and various climate factors.
Disclosure of Invention
In view of the deficiencies of the prior art, the present invention provides an inter-satellite spatial communication system configured to: obtaining a relative position track relationship between the first satellite and any other satellite presumed at each sampling moment t in a future period L according to the received satellite ephemeris information, and determining at least one other satellite and at least one effective inter-satellite link which can establish an effective inter-satellite link with the first satellite; placing the generated probability distribution for the predetermined channel condition of at least one of the active inter-satellite links into a set X based on channel quality statistics for that active inter-satellite link, and determining and placing the predetermined transmission condition into a set Y based on a currently transmitted packet received by the communication system; operating with said predetermined channel conditions and said predetermined transmission conditions by combining a plurality of pre-stored coded modulation schemes, set Z, for said communication systemAnalyzing response characteristics to determine P containing optimal effective inter-satellite link and optimal code modulation schemebest＝XrYsZtAnd P comprising alternative active inter-satellite links and alternative coded modulation schemesalter＝XiYjZkAnd determining a coding modulation mode of one of the optimal coding modulation scheme and the alternative effective coding modulation scheme at the node according to a queue management strategy of the length of the determined maintenance queue, and establishing data transmission through an inter-satellite link of one of the optimal effective inter-satellite link and the alternative effective inter-satellite link.
According to a preferred embodiment, when the inter-satellite link determined by the current transmission data packet fails or the target node is invalid, the current node transmits failure information or target node invalid information to the relay node through the communication system and substitutes into the cost model to obtain an updated optimal effective inter-satellite link and an updated optimal coding modulation scheme, and the coding modulation mode or the data transmission link is dynamically reset or partially reset according to the obtained updated optimal effective inter-satellite link and the optimal coding modulation scheme.
According to a preferred embodiment, the cost model is the existing operation data and/or fault information and/or target node invalid information passing through the communication system, data analysis is performed on the cost model based on at least one influence characteristic, an analysis result is output, and under the condition that a local constraint incidence relation cannot be established between the analysis result and a preset transmission condition, a cost weight coefficient of the preset channel condition is updated, and an optimal effective inter-satellite link and an optimal code modulation scheme, and an alternative effective inter-satellite link and an alternative code modulation scheme are re-determined; and under the condition that a local constraint incidence relation can be established between the analysis result and the transmission result, maintaining the cost weight coefficient of the predetermined channel condition, and re-determining the optimal effective inter-satellite link and the optimal code modulation scheme as well as the alternative effective inter-satellite link and the alternative code modulation scheme based on the current node.
According to a preferred embodiment, the plurality of coding schemes comprise at least one or more of Reed-solomon (rs) coding, Convolutional Code (CC) coding, Golay coding, Hamming coding, or Bose, Ray-Chaudhuri, hocquenghem (bch) coding, and the plurality of modulation schemes comprise at least one or more of Binary Phase Shift Keying (BPSK) mapping, Quadrature Phase Shift Keying (QPSK) mapping, 8 phase shift keying (8PSK) mapping, 16 Quadrature Amplitude Modulation (QAM) mapping, 64 Quadrature Amplitude Modulation (QAM) mapping, or 256 Quadrature Amplitude Modulation (QAM) mapping.
According to a preferred embodiment, said queue management policy comprises at least the following steps: acquiring a plurality of service data volumes to be distributed and judging the service type of the current service to be distributed according to a preset transmission condition, wherein the service type at least comprises one or any combination of the following: HTTP (Hyper Text Transfer Protocol) service, P2P (Peer to Peer) service, instant messaging service, routing network management information service, and other types of services, or determining the service types as at least four service types ordered in sequence from large to small according to the importance degree according to a predetermined transmission condition; and traversing the distributable effective inter-satellite links and judging the availability of the current effective inter-satellite links according to preset channel conditions, wherein the preset channel conditions are that at least one effective inter-satellite link which is sequenced from large to small according to priority in importance degree levels of different service types is determined according to the weighted judgment of the time delay, the packet loss rate, the geographical position of the node, the hop count between two ends and the congestion condition of the inter-satellite links in sequence.
According to a preferred embodiment, said queue management policy further comprises the steps of: the method comprises the steps of randomly combining a plurality of coding schemes and a plurality of modulation schemes to obtain a plurality of coding modulation schemes, respectively judging scheme estimation parameters of different influence characteristics corresponding to the coding modulation schemes under the condition that the current service type is distributed through a current effective inter-satellite link, determining a coding modulation mode of one of an optimal coding modulation scheme and an alternative effective coding modulation scheme when the obtained scheme estimation parameters meet target parameters corresponding to a current transmission data packet, and establishing data connection for the current transmission data packet through an inter-satellite link of the optimal effective inter-satellite link and the alternative effective inter-satellite link.
According to a preferred embodiment, a preset waiting time of the current transmission data packet is preset based on a target parameter corresponding to the current transmission data packet, and for the current transmission data packet belonging to the first class of service types, the current transmission data packet is subjected to top arrangement under the condition that a first queue waiting time of the current transmission data packet exceeds the preset waiting time;
and for the current transmission data packet which does not belong to the first class service type, performing packet loss processing on the current transmission data packet under the condition that the waiting time of the second queue exceeds the preset waiting time and the node queue is full, or performing top arrangement on the current transmission data packet when the waiting time of the second queue exceeds the preset waiting time and the descending times of the second queue exceeds a preset descending threshold.
A method of inter-satellite spatial communication, the method comprising at least the steps of: obtaining a relative position track relation between the first satellite and any other satellite in the future period L presumed at each sampling moment t according to the received satellite ephemeris information, and determining at least one other satellite and at least one effective inter-satellite link which can establish an effective inter-satellite link with the first satellite;
based on statistics of channel quality of at least one of the active inter-satellite links, placing the generated probability distribution for the predetermined channel conditions for that active inter-satellite link into a set X ', i.e., X' is { X '1, X' 2, X '3.... X' i }, and determining and placing the predetermined transmission conditions into a set Y based on currently transmitted packets received by the communication system, i.e., the set Y is { Y1, Y2, Y3..... Yj };
determining an optimal effective inter-satellite link and an optimal coding modulation scheme as well as an alternative effective inter-satellite link and an alternative coding modulation scheme by analyzing a plurality of coding modulation schemes prestored in the communication system in combination with the operation influence characteristics of the preset channel condition and the preset transmission condition, determining a coding modulation mode of one of the optimal coding modulation scheme and the alternative effective coding modulation scheme at the node according to a queue management strategy for maintaining the length of the queue, and establishing data transmission through the inter-satellite link of one of the optimal effective inter-satellite link and the alternative effective inter-satellite link.
According to a preferred embodiment, the method further comprises the steps of: when the inter-satellite link determined by the current transmission data packet fails or the target node is invalid, the current node transmits failure information or target node invalid information to the relay node through the communication system and substitutes the failure information or the target node invalid information into the cost model to obtain an updated optimal effective inter-satellite link and an updated optimal coding modulation scheme, and the coding modulation mode or the data transmission link is dynamically reset or partially reset according to the obtained updated optimal effective inter-satellite link and the optimal coding modulation scheme.
According to a preferred embodiment, the cost model is the existing operation data and/or fault information and/or target node invalid information passing through the communication system, data analysis is performed on the cost model based on at least one influence characteristic, an analysis result is output, and under the condition that a local constraint incidence relation cannot be established between the analysis result and a preset transmission condition, a cost weight coefficient of the preset channel condition is updated, and an optimal effective inter-satellite link and an optimal code modulation scheme, and an alternative effective inter-satellite link and an alternative code modulation scheme are re-determined;
and under the condition that the local constraint incidence relation can be established between the analysis result and the transmission result, maintaining the cost weight coefficient of the predetermined channel condition, and re-determining the optimal effective inter-satellite link and the optimal code modulation scheme as well as the alternative effective inter-satellite link and the alternative code modulation scheme based on the current node.
The beneficial technical effects of the invention comprise one or more of the following:
(1) the invention mainly determines the optimal effective inter-satellite link and obtains a queue management strategy in the inter-satellite link establishment process on the basis by analyzing the inter-satellite link communication environment, the service type initiated by an initiating terminal and the like, and the alternative effective inter-satellite link can be immediately replaced by the alternative effective inter-satellite link as the optimal effective inter-satellite link when the target node corresponding to the optimal effective inter-satellite link is in a blocked state, a fault state or an invalid state, thereby avoiding the need of occupying part of the computing capacity of the satellite where the current node is positioned to compute a new effective inter-satellite link and a new effective coding modulation scheme for the current transmission data packet, namely improving the accuracy and timeliness of the transmission information quality of the whole communication network.
Meanwhile, the invention can use a modulation scheme with higher stability degree to protect the data to be transmitted with higher importance degree, use a scheme with general stability degree to protect the data to be transmitted with lower importance degree, and can simultaneously meet different requirements of different service communication qualities corresponding to a plurality of service types to the maximum extent by setting a queue management strategy through the mode of judging the service types and adjusting the transmission strategy in real time according to the channel quality of the inter-satellite link, thereby reducing the processing load influence of each node in the whole communication network system and simultaneously meeting different service requirements to the maximum extent.
(2) The invention can avoid the continuous descending processing of the current transmission data packet by setting the optimized queue management strategy, and particularly can seriously affect the transmission rate of the transmission data of non-delay sensitive service types even if the transmission data is non-delay sensitive, and the distribution waiting time is too long.
Drawings
Fig. 1 is a simplified structural connection diagram of a preferred embodiment of a communication system provided by the present invention.
List of reference numerals
101: the originating terminal 102: initiating terminal access satellite
103: the ground station 104: target terminal access satellite
105: the target terminal 106: laser communication terminal between satellites
107: satellite-ground laser communication terminal
Detailed Description
The following detailed description is made with reference to the accompanying drawings.
In describing the present invention, it is to be understood that, to facilitate understanding, identical reference numerals have been used, where possible, to designate similar elements that are common to the figures.
As used throughout this application, the word "may" is used in a permissive sense (i.e., meaning having the potential to), rather than the mandatory sense (i.e., meaning must). Similarly, the word "including" means including but not limited to.
The phrases "at least one," "one or more," and/or "are open-ended expressions that encompass both association and isolation in operation. For example, each of the expressions "at least one of A, B and C", "at least one of A, B or C", "one or more of A, B and C", "A, B or C" and "A, B and/or C" refers to a alone a, B alone, C, A and B together, a and C together, B and C together, or A, B and C together, respectively.
The term "a" or "an" entity refers to one or more of that entity. As such, the terms "a" (or "an"), "one or more," and "at least one" can be used interchangeably herein. It should also be noted that the terms "comprising," "including," and "having" may be used interchangeably.
The embodiment discloses a space communication method between satellites, which can also be a satellite laser communication method, and can also be a communication method used for communication between an aircraft and the satellites. The preferred embodiments of the present invention are described in whole and/or in part in the context of other embodiments, which can supplement the present embodiment, without resulting in conflict or inconsistency.
A method for inter-satellite space communication, the method comprising at least the steps of: and obtaining the relative position track relationship between the first satellite and any other satellite in the future time period L, which is presumed at each sampling moment t, by the first satellite according to the received satellite ephemeris information. The satellite ephemeris information is also referred to as satellite orbit data, and parameters such as time, coordinates, azimuth, speed and the like of the satellite can be determined with high precision by using the relationship among six orbit parameters of the kepler law, so that the satellite ephemeris information can be used for accurately calculating, predicting, describing and tracking the running states such as the satellite, the flight time, the position, the speed and the like. Preferably, the relative position track relationship between two satellites is obtained through satellite ephemeris information. And acquiring an inter-satellite distance observed quantity between two satellites by a radio ranging method. Since the operation of the satellite is periodic, the change of the network topology is also periodic, and therefore the satellite network has predictability, and therefore the satellite link to be established can be predicted. At least one other satellite that can establish a valid inter-satellite link with the first satellite is determined. The effective inter-satellite link is a single-layer satellite network or a double-layer satellite network which can mutually establish a network topology structure with the first satellite. By inferring a relative position-trajectory relationship between the two satellites over a future time period L, an effective connection of at least one inter-satellite link including the first satellite over the future time period L can be determined.
Based on the statistics of the channel quality of at least one of the effective inter-satellite links. Preferably, the channel quality at least includes a received power parameter of the inter-satellite link receiver, a carrier-to-noise ratio parameter of the propagation signal, an error rate parameter of the propagation signal, a doppler shift parameter of the propagation signal, a threshold parameter of the inter-satellite link system, and the like, which determine the channel quality of the effective inter-satellite link. The generated probability distribution for the predetermined channel condition for the active inter-satellite link is placed into the set X'. I.e., set X 'is { X' 1, X '2, X' 3. Each effective intersatellite link has a corresponding preset channel condition XiAnd the predetermined channel condition is that at least one effective inter-satellite link in the importance degree levels of different service types and sequentially ordered from large to small according to the priority is determined according to the weighted judgment of the time delay, the packet loss rate, the geographic position of the node, the hop count between two ends and the congestion condition of the inter-satellite link in sequence. And based on reception by the communication systemDetermines the predetermined transmission condition and places it in set Y. I.e., the set Y is { Y1，Y2，Y3...Ys...Yj}. An impact signature is run by combining the predetermined channel condition and the predetermined transmission condition for a plurality of coded modulation schemes pre-stored by the communication system. The multiple coded modulation schemes, i.e., set Z, are { Z }1，Z2，Z3...Zt...Zk}. Determining the optimal effective inter-satellite link and the optimal coded modulation scheme, i.e. Pbest＝XrYsZt. Determining alternative effective inter-satellite links and alternative coded modulation schemes, i.e. Palter＝XiYjZk. And determining the optimal code modulation scheme as a code modulation mode at the node according to a queue management strategy for maintaining the length of the queue. And determining the alternative effective code modulation scheme as a code modulation mode at the node according to a queue management strategy for maintaining the length and the size of the queue. And determining the coding modulation mode of one of the optimal coding modulation scheme and the alternative effective coding modulation scheme at the node according to a queue management strategy of the determined size of the maintenance queue length. And determining the optimal effective inter-satellite link as an inter-satellite link and establishing data transmission. Or determining the alternative effective inter-satellite link as the inter-satellite link and establishing data transmission. Preferably, when the target node corresponding to the optimal effective inter-satellite link is in a blocked state, a fault state or an invalid state, the alternative effective inter-satellite link is preferably immediately replaced by the optimal effective inter-satellite link, so that the problem that a part of computing capacity of a satellite where the current node is located is required to be occupied to calculate a new effective inter-satellite link and a new effective coding modulation scheme for the current transmission data packet is avoided, and the accuracy and timeliness of the transmission information quality of the whole communication network are improved.
Preferably, when the inter-satellite link determined by the current transmission data packet fails or the target node is invalid. And transmitting fault information or target node invalid information to the relay node by the current node through the communication system and substituting the fault information or the target node invalid information into the cost model. And obtaining an updated optimal effective inter-satellite link and an updated optimal coding modulation scheme. And dynamically resetting or partially resetting the code modulation mode or the data transmission link according to the obtained updated optimal effective inter-satellite link and the optimal code modulation scheme. And dynamically and partially resetting the code modulation mode or the data transmission link according to the obtained updated optimal effective inter-satellite link and the optimal code modulation scheme. When the inter-satellite link determined by the current transmission data packet is in failure or the target node is invalid, the current node transmits failure information or target node invalid information to the relay node through the communication system and substitutes the failure information or target node invalid information into the cost model, and the selected coding modulation scheme is combined with the updated effective inter-satellite link obtained after the failure information node and/or the invalid target node are removed from the current node and substitutes the updated effective inter-satellite link into the cost model for analysis, so that the updated optimal effective inter-satellite link and the updated optimal coding modulation scheme can be obtained. Preferably, the updated optimal coded modulation scheme is only indicated to correspond to the updated optimal effective inter-satellite link, and substantially the coded modulation scheme is not updated and the originally selected coded modulation scheme is maintained for data transmission, i.e. the originally selected coded modulation scheme is maintained for dynamically resetting the data transmission link.
The cost model is the existing operation data and/or fault information and/or target node invalid information of the communication system, and data analysis is carried out on the cost model based on at least one influence characteristic and an analysis result is output. And under the condition that the local constraint incidence relation cannot be established between the analysis result and the preset transmission condition, updating the cost weight coefficient of the preset channel condition and re-determining the optimal effective inter-satellite link and the optimal coding modulation scheme as well as the alternative effective inter-satellite link and the alternative coding modulation scheme. Preferably, the Cost model is Costs,r,t＝Ys—(a*Xr+b*Zt) I.e. selecting a certain code modulation scheme Z for the currently transmitted data packettCode modulated and conditioned to a predetermined channel condition XrAfter being used as the selected inter-satellite link, the predetermined transmission condition YsOptimal data transmission cost Co obtained by cost estimationsts,r,t. Wherein the optimal data transmission Costs,r,tThe data transmission cost is lower than that obtained by carrying out cost estimation on any other coding modulation scheme and any predetermined channel condition. Where a + b is 1, a is the cost weight coefficient of the predetermined channel condition, and b is the cost weight coefficient of the coded modulation scheme.
The preferred Cost model is Costi,j,k＝β*Yj—(a*Xi+b*Zk) I.e. selecting a certain code modulation scheme Z for the currently transmitted data packetkCode modulated and conditioned to a predetermined channel condition XiAfter the selected inter-satellite link, the predetermined transmission condition Y after the convergence is expectedjAlternative data transmission Cost obtained by carrying out Cost estimationi,j,kAlternative data transmission Costi,j,kIs only greater than the optimal data transmission Costs,r,t. Where a + b is 1, a is the cost weight coefficient of the predetermined channel condition, and b is the cost weight coefficient of the coded modulation scheme. Where β is the desired convergence factor and β<1, i.e. the expectation of converging the transmission result through the predetermined transmission condition corresponding to the currently transmitted data packet by the loss part, beta is only used to represent Costi,j,kThe transmission Cost of the alternative data is only greater than the optimal data transmission Costs,r,tAt the selected alternative data transmission Costi,j,kThen, the best data transmission Cost can be combineds,r,tA desired convergence factor, β, is determined, which in turn determines a desired magnitude of convergence to the transmission result. The expected convergence factor β can be used to show the transmission quality condition corresponding to the current transmission data packet to the user after the user receives the current transmission data packet. Therefore, the alternative effective inter-satellite link and the coding modulation scheme can be selected, and the optimal effective inter-satellite link and the optimal coding modulation scheme P are selectedbest(XrYsZt) When data transmission is carried out and the determined inter-satellite link fails or the target node is invalid, preferably, when the feedback is data packet loss information, the established alternative effective inter-satellite link and the alternative coding modulation scheme P are adoptedalter(XiYjZk) Reset Pbest(XrYsZt) And thus carry on the secondary data transmission; and when the feedback target node is invalid, performing data analysis on the feedback target node based on at least one influence characteristic and outputting an analysis result.
Wherein at a certain predetermined channel condition XrHas a channel estimation parameter x associated with the timeliness requirement influence characteristic and at least comprises the time delay of the effective inter-satellite link and the congestion condition of the inter-satellite link1(ii) a Under a certain predetermined channel condition XrThe channel estimation parameter x at least comprises the packet loss rate of the effective inter-satellite link and is associated with the reliability requirement influence characteristic2(ii) a Under a certain predetermined channel condition XrAssociated with a security requirement affecting feature and comprising at least a number of hops between two ends of said active inter-satellite link and a channel estimation parameter x of the geographical location of the node3. I.e. a certain predetermined channel condition XrMay be a parameter y associated with the purpose of influencing the characteristic1，y2，y3} one-to-one correspondence of { x1，x2，x3}. Preferably, the respective impact characteristics y are based on different traffic types1，y2，y3The difference of the levels is that the importance degree levels of different service types are distinguished, and the importance degree levels in different levels are according to { x }1，x2，x3And { y }and { y1，y2，y3The proximity between them determines the priority with which at least one valid inter-satellite link can be ordered sequentially from large to small.
Wherein, at a certain code modulation scheme ZtHaving a scheme estimation parameter z associated with a time-dependent requirement impact characteristic and including at least the computational complexity of the coded modulation scheme1(ii) a At a certain coded modulation scheme ZtHaving a scheme prediction parameter z associated with a reliability requirement impact characteristic and comprising at least a bit error rate of the coded modulation scheme2(ii) a At a certain coded modulation scheme ZtScheme pre-coding associated with a security requirement impact characteristic and including at least the encryption complexity of said coded modulation schemeEstimate parameter z3. I.e. a certain coded modulation scheme ZtMay be a parameter y associated with the purpose of influencing the characteristic1，y2，y3{ z } one-to-one correspondence1，z2，z3}. Preferably according to respective predetermined channel conditions XrDifferent signal-to-noise ratios of (A) and (B) can obtain different predetermined channel conditions XrThe corresponding code modulation scheme Zt. Whereby the Cost model Costs,r,t＝Ys—(a*Xr+b*Zt) Into the row matrix (y)1，y2，y3)、(x1，x2，x3) And (z)1，z2，z3) After that, it can be converted to Costs,r,t＝(y1，y2，y3)—{a*(x1，x2，x3)+b*(z1，z2，z3)}. Preferably, the Cost model Cost is obtained from thisi,j,k＝β*Yj—(a*Xi+b*Zk) Into the row matrix (y)1，y2，y3)、(x1，x2，x3) And (z)1，z2，z3) After that, it can be converted to Costi,j,k＝β*(y1，y2，y3)—{a*(x1，x2，x3)+b*(z1，z2，z3)}. Therefore, data analysis based on at least one influence characteristic can be completed, and the output data contains the optimal data transmission Costs,r,tAnd/or alternative data transmission Costi,j,kThe analysis result of (3).
Preferably, in a case that a local constraint incidence relation cannot be established between the analysis result and a predetermined transmission condition, the cost weight coefficient of the predetermined channel condition is updated, and the optimal effective inter-satellite link and the optimal modulation scheme as well as the alternative effective inter-satellite link and the alternative modulation scheme are re-determined. And under the condition that the local constraint incidence relation can be established between the analysis result and the transmission result, maintaining the cost weight coefficient of the predetermined channel condition, and re-determining the optimal effective inter-satellite link and the optimal code modulation scheme as well as the alternative effective inter-satellite link and the alternative code modulation scheme based on the current node. And updating the cost weight coefficient of the preset channel condition. And re-determining the optimal effective inter-satellite link and the optimal coding modulation scheme. And re-determining the alternative effective inter-satellite link and the alternative coding modulation scheme. The cost weighting factor for the predetermined channel condition is maintained. And re-determining the optimal effective inter-satellite link and the optimal code modulation scheme based on the current node. And re-determining the alternative effective inter-satellite link and the alternative code modulation scheme. Therefore, the use of the inter-satellite link can be limited to avoid the random establishment of the inter-satellite link, the effective inter-satellite link is only limited to be established between the first satellite and the adjacent satellite by improving the cost weight coefficient which has the influence on the effective inter-satellite link, or the effective inter-satellite link is established by limiting the rotation angle of the movable beam of the first satellite, and the complexity of the whole satellite communication network is favorably reduced, so that the large fluctuation of the background noise is avoided.
Judging whether the analysis result and the preset transmission condition can establish the local constraint incidence relation, namely judging Costs,r,tWhether the data transmission cost interval is locally included by an acceptable data transmission cost interval preset in a preset transmission condition. In Costs,r,tUnder the condition that the analysis result is locally included by an acceptable data transmission cost interval preset in a preset transmission condition, namely a local constraint incidence relation can be established between the analysis result and the preset transmission condition; in Costs,r,tAnd if the data transmission cost interval is not locally included by the acceptable data transmission cost interval preset in the preset transmission condition, that is, the local constraint association relationship cannot be established between the analysis result and the preset transmission condition. Under the condition that the local constraint incidence relation cannot be established between the analysis result and the preset transmission condition, because the current cost weight coefficient is no longer suitable for the preset transmission condition of the current transmission data packet after the data transmission environment changes, the cost weight coefficient of the preset channel condition is updated, wherein the updating at least comprises the step of increasing the cost weight of the preset channel conditionAnd the effective inter-satellite link closest to the preset transmission condition is selected under the node to be updated in a mode of synchronously reducing the cost weight coefficient of the coded modulation scheme, so that the use of the inter-satellite link can be limited in the mode, and the inter-satellite link is prevented from being arbitrarily established under the unconstrained condition. The acceptable data transmission cost interval preset in the predetermined transmission condition may be a destination parameter { y } of the predetermined transmission condition of the current transmission data packet1，y2，y3In the preceding, y is a numerical interval rather than a fixed number1、y2、y3Thus, the obtained Cost can be judgeds,r,tWhether the local constraint association relation is locally contained by an acceptable data transmission cost interval preset in a preset transmission condition and whether the local constraint association relation can be established between the analysis result and the preset transmission condition.
Preferably the plurality of coding schemes comprise at least one or more of Reed-solomon (rs) coding, Convolutional Code (CC) coding, Golay coding, Hamming coding, or Bose, Ray-Chaudhuri, hocquenghem (bch) coding, and the plurality of modulation schemes comprise at least one or more of Binary Phase Shift Keying (BPSK) mapping, Quadrature Phase Shift Keying (QPSK) mapping, 8 phase shift keying (8PSK) mapping, 16 Quadrature Amplitude Modulation (QAM) mapping, 64 Quadrature Amplitude Modulation (QAM) mapping, or 256 Quadrature Amplitude Modulation (QAM) mapping. Among them, Quadrature Amplitude Modulation (QAM) mapping is a modulation scheme that transfers data by modulating the amplitude of two carriers. The two carriers, which are typically sinusoidal signals, are offset from each other by 90 phases and are thus referred to as quadrature carriers. The number 16 or 64 before QAM indicates the total number of symbols the mapper can map the data-bit group. For example, a 16 Quadrature Amplitude Modulation (QAM) mapping converts 4 bits of data into 24/16 bits.
Preferably, the queue management policy comprises at least the following steps: obtaining a plurality of service data volumes to be distributed and judging the service type of the current service to be distributed according to a preset transmission condition, wherein the service type at least comprises one or any combination of the following: HTTP hypertext transfer protocol service, P2P point-to-point service, instant communication service, routing network management information service and a plurality of other types of services, or determining the service types as at least four service types which are sequenced from large to small according to the importance degree according to the preset transmission condition; and traversing the distributable effective inter-satellite links and judging the availability of the current effective inter-satellite links according to preset channel conditions, wherein the preset channel conditions are that at least one effective inter-satellite link which is sequenced from large to small according to priority in importance degree levels of different service types is determined according to the weighted judgment of the time delay, the packet loss rate, the geographical position of the node, the hop count between two ends and the congestion condition of the inter-satellite links in sequence. Preferably, the currently transmitted data packet includes at least predetermined transmission conditions having time-dependent characteristics, such as reliability requirements and security requirements. The plurality of predetermined transmission conditions have destination parameters corresponding thereto, respectively. For a coded modulation scheme, under the influence characteristics corresponding to a plurality of predetermined transmission conditions, scheme estimation parameters corresponding to a plurality of influence characteristics are provided. The service types can be determined as at least four service types which are sequentially ordered from large to small according to the importance degree according to the preset transmission condition. For example, the service type may include at least four service types, i.e., a service type with high delay sensitivity and fault tolerance, a service type with low delay sensitivity and fault tolerance, a service type with high non-delay sensitivity and fault tolerance, and a service type with low non-delay sensitivity and fault tolerance. Similarly, for a service type with low audio/video fault tolerance requirement but sensitive delay, an inter-satellite link with short delay and a corresponding code modulation scheme with general stability and relatively high decoding rate are required to be selected. By the method of adjusting the transmission strategy in real time according to the judgment of the service types and the channel quality of the inter-satellite link, the modulation scheme with higher stability can be used for protecting the data to be transmitted with higher importance, the scheme with common stability can be used for protecting the data to be transmitted with lower importance, and different requirements of different service communication qualities corresponding to multiple service types can be met to the maximum extent by setting the queue management strategy, so that the different service requirements can be met to the maximum extent while the processing load influence of each node in the whole communication network system is reduced.
Preferably, the queue management policy further comprises the steps of: the method comprises the steps of obtaining a plurality of coding modulation schemes by combining a plurality of coding schemes and a plurality of modulation schemes randomly, judging scheme estimation parameters of different influence characteristics corresponding to the plurality of coding modulation schemes respectively under the condition that the current service type is distributed through a current effective inter-satellite link, determining a coding modulation mode of one of an optimal coding modulation scheme and an alternative effective coding modulation scheme when the obtained scheme estimation parameters meet target parameters corresponding to a current transmission data packet, and establishing data connection for the current transmission data packet through an inter-satellite link of the optimal effective inter-satellite link and the alternative effective inter-satellite link.
Preferably, a preset waiting time of the currently transmitted data packet is preset based on a destination parameter corresponding to the currently transmitted data packet, and for the currently transmitted data packet belonging to the first class of service type, the currently transmitted data packet is subjected to top-ranking arrangement when a first queue waiting time of the currently transmitted data packet exceeds the preset waiting time. Preferably, the first type of service type may be a delay-sensitive and low-fault-tolerance service type, and the importance degree of this type of service type is higher, so that the corresponding preset waiting tolerance degree is lower, when the waiting allocated time exceeds the preset waiting time, the first type of service type needs to be subjected to top-set arrangement processing, and an inter-satellite link is preferentially allocated to the first type of service type for data transmission.
Preferably, for the current transmission data packet not belonging to the first class service type, under the condition that the waiting time of the second queue exceeds the preset waiting time and the node queue is full, the current transmission data packet is subjected to packet loss processing, or when the waiting time of the second queue exceeds the preset waiting time and the descending times exceeds the preset descending threshold value, the current transmission data packet is subjected to top arrangement. Preferably, the service type not belonging to the first class may be a non-delay-sensitive and low-fault-tolerance service type, and when the waiting time of the second queue of the current transmission data packet exceeds the preset waiting time and the node queue is full, the packet loss processing is performed on the current transmission data packet, and meanwhile, the packet loss information is fed back to the initiating terminal to request retransmission in a manner different from the previous inter-satellite link and the previous coded modulation scheme, so as to avoid the condition of blocking faults due to excessive data volume of the node. Preferably, the service types not belonging to the first class may be non-delay-sensitive and high-fault-tolerance service types, and when the waiting time of the second queue of the currently transmitted data packet exceeds the preset waiting time and the descending frequency of the second queue exceeds a preset descending threshold, the currently transmitted data packet is arranged at the top. The descending times corresponding to the current transmission data packet of the service type is that after the current transmission data packet is arranged in the transmission queue, other transmission data packets are arranged in the queue in front of the current transmission data packet for queue insertion, and the descending times are recorded as the descending times when the sequence of the queue of the current transmission data packet is descending. In order to avoid that the current transmission data packet is continuously processed in a descending order, for the transmission data of the non-delay sensitive service type, even if the transmission data is non-delay sensitive, the transmission rate of the transmission data can be seriously influenced by overlong distribution waiting time, so that the transmission data can be effectively and sequentially transmitted according to the importance degree of different service types by setting the preset descending order threshold, and meanwhile, the maximum processing rate is provided for the service type with lower importance degree.
Preferably, the effective inter-satellite connection may be a double-layer satellite network such as a low-orbit/geostationary orbit relay type inter-satellite link, a relay relationship is established between the low-orbit satellite and the geostationary orbit satellite through the inter-satellite link, and data coverage transmission is performed to a medium-low latitude area through the geostationary orbit satellite, so that communication service of the low-orbit satellite outside a field of view of the ground station is realized, and the low-orbit satellite is mainly responsible for communication work in the high-latitude area.
According to a preferred embodiment, as shown in fig. 1, the effective inter-satellite link may be an inter-satellite link path composed of a plurality of nodes in a low orbit satellite network, such as: transmitting, by an originating terminal 101, a first data packet to an originating terminal access satellite 102, wherein the first data packet includes an originating terminal address, a target terminal address, and first communication information, determining, by an originating terminal access satellite 102, an associated ground station 103 and transmitting the address of the originating terminal access satellite 102 and the target terminal address to the ground station 103, determining, by the ground station 103, an address of a target terminal access satellite 104 associated with the target terminal address and transmitting the address of the target terminal access satellite 104 back to the originating terminal access satellite 102 according to the address of the originating terminal access satellite 102, transmitting, by an originating terminal access satellite 102, a second data packet to the target terminal access satellite 104 over an inter-satellite link, wherein the second data packet includes the address of the target terminal access satellite 104, The target terminal address and the first communication information are transmitted by the target terminal access satellite 104 to the target terminal 105 in a third data packet, wherein the third data packet includes the target terminal address and the first communication information. The initiating terminal access satellite 102 and the target terminal access satellite 104 respectively include: the system comprises at least two inter-satellite laser communication terminals 106 and a plurality of satellite-ground laser communication terminals 107, wherein the at least two inter-satellite laser communication terminals 106 are used for carrying out laser bidirectional communication with other satellites, the plurality of satellite-ground laser communication terminals 107 are used for carrying out bidirectional laser communication with a corresponding number of ground stations and/or aircrafts at the same time, and each satellite-ground laser communication terminal 107 can scan the ground opening angle of the satellite where the satellite is located. Preferably, by the method, the user communication data or the communication information is directly forwarded among satellites without falling to the ground, so that the user communication data is difficult to acquire by attacking the ground station, and the satellite communication safety is improved. And the satellite addressing route of the data packet exchange is separated from the user terminal addressing route, and each satellite accesses the satellite address and the calculated route to forward according to the terminal provided by the ground station, or forwards after independently calculating part of the route on the satellite, so that the satellite does not need or only needs to bear a small amount of route calculation work, the calculation task of the satellite is greatly reduced, and the cost effectiveness is improved.
It should be noted that the above-mentioned embodiments are exemplary, and that those skilled in the art, having benefit of this disclosure, may devise various solutions which are within the scope of this disclosure and are within the scope of the invention. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not intended to be limiting on the claims. The scope of the invention is defined by the claims and their equivalents.
Although the present invention has been described in detail, modifications within the spirit and scope of the invention will be readily apparent to those of skill in the art. Such modifications are also considered part of the present disclosure. In view of the foregoing discussion, relevant knowledge in the art, and references or information discussed above in connection with the background, all of which are incorporated herein by reference, further description is deemed unnecessary. Further, it should be understood that aspects of the invention and portions of the various embodiments may be combined or interchanged both in whole or in part. Furthermore, those of ordinary skill in the art will appreciate that the foregoing description is by way of example only, and is not intended to limit the invention.
The foregoing discussion of the disclosure has been presented for purposes of illustration and description. It is not intended to be limited to the form disclosed herein. In the foregoing detailed description, for example, various features of the disclosure are grouped together in one or more embodiments, configurations, or aspects for the purpose of streamlining the disclosure. Features of the embodiments, configurations or aspects may be combined in alternative embodiments, configurations or aspects to those discussed above. This method of disclosure is not to be interpreted as reflecting an intention that the disclosure requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment, configuration, or aspect. Thus the following claims are hereby incorporated into the detailed description, with each claim standing on its own as a separate embodiment of the disclosure.
Moreover, although the description of the present disclosure has included description of one or more embodiments, configurations, or aspects and certain variations and modifications, other variations, combinations, and modifications are within the scope of the disclosure, e.g., as may be within the skill and knowledge of those in the art, after understanding the present disclosure. It is intended to obtain rights which include alternative embodiments, configurations, or aspects to the extent permitted, including alternate, interchangeable and/or equivalent structures, functions, ranges or steps to those claimed, whether or not such alternate, interchangeable and/or equivalent structures, functions, ranges or steps are disclosed herein, and without intending to publicly dedicate any patentable subject matter.

Claims (9)

1. A communication system, characterized in that the system is configured to:
determining P by combining a plurality of pre-stored coded modulation schemes, set Z, of the communication system with a predetermined channel condition and a predetermined transmission condition operational impact signature analysis derived by counting channel quality of at least one active inter-satellite linkbestAnd PalterSaid P isbestComprises an optimal effective inter-satellite link and an optimal code modulation scheme, PalterThe method comprises the steps of selecting an alternative effective inter-satellite link and an alternative coding modulation scheme;
when the target node corresponding to the optimal effective inter-satellite link is in a blocked state or a fault state or an invalid state, the alternative effective inter-satellite link can be immediately replaced by the optimal effective inter-satellite link;
when the inter-satellite link determined by the current transmission data packet fails, the current node transmits failure information or target node invalid information to the relay node through the communication system and substitutes the failure information or target node invalid information into the cost model, and the selected coding modulation scheme is combined with the updated effective inter-satellite link and the updated optimal coding modulation scheme to be analyzed according to the updated at least one effective inter-satellite link obtained after the failure information node and/or the invalid target node are removed from the current node, so that the updated optimal effective inter-satellite link and the updated optimal coding modulation scheme can be obtained, and the coding modulation mode or the data transmission link is dynamically reset or partially reset according to the obtained updated optimal effective inter-satellite link and the optimal coding modulation scheme.
2. The system of claim 1, wherein the active inter-satellite link is a single-layer satellite network or a dual-layer satellite network capable of establishing a network topology with the first satellite.
3. The system of claim 2, wherein the channel quality comprises at least the channel quality of the effective inter-satellite link determined by a received power parameter of an inter-satellite link receiver, a carrier-to-noise ratio parameter of the propagated signal, a bit error rate parameter of the propagated signal, a doppler shift parameter of the propagated signal, and an inter-satellite link system threshold parameter.
4. The system according to claim 3, wherein the predetermined channel condition is to determine at least one valid inter-satellite link within the importance level hierarchy of different service types according to the priority order from high to low by performing weighting judgment on the time delay, the packet loss ratio, the geographical location of the node, the number of hops between two ends, and the congestion of the inter-satellite link in sequence.
5. The system according to claim 4, wherein the cost model performs data analysis and outputs an analysis result based on at least one influence characteristic through existing operation data and/or fault information and/or target node invalid information of the communication system, and updates the cost weight coefficient of the predetermined channel condition and re-determines the optimal effective inter-satellite link and the optimal coded modulation scheme and the alternative effective inter-satellite link and the alternative coded modulation scheme in case that a local constraint association relation cannot be established between the analysis result and a predetermined transmission condition.
6. The system according to claim 5, wherein in case that a local constraint association relationship can be established between the analysis result and the transmission result, the cost weight coefficient of the predetermined channel condition is kept and the optimal effective inter-satellite link and the optimal coded modulation scheme and the alternative effective inter-satellite link and the alternative coded modulation scheme are re-determined based on the current node.
7. The system of claim 6, wherein after a certain modulation scheme Zt is selected for modulation coding of the currently transmitted data packet and a certain predetermined channel condition Xr is used as the selected inter-satellite link, the Cost of the predetermined transmission condition Ys is estimated to obtain an optimal data transmission Costs,r,tI.e., a Cost model, which can be Costs,r,t=Ys—（a*Xr+b*Zt) Wherein the optimal data transmission Costs,r,tThe data transmission cost is lower than that obtained by carrying out cost estimation on any other coded modulation scheme and any predetermined channel condition, wherein a + b =1, a is a cost weight coefficient of the predetermined channel condition, and b is the cost weight coefficient of the coded modulation scheme.
8. The system of claim 7, wherein the Cost model is further capable of being directed to Costi,j,k=β*Yj—（a*Xi+b*Zk) I.e. selecting a certain code modulation scheme Z for the currently transmitted data packetkCode modulation and adaptation of a predetermined channel condition XiAfter the selected inter-satellite link, the predetermined transmission condition Y after the convergence is expectedjAlternative data transmission Cost obtained by carrying out Cost estimationi,j,kAlternative data transmission Costi,j,kCost of only greater than optimal data transmission Costs,r,tWherein, Costi,j,kFor alternative data transmission cost, a + b =1, a is the cost weight coefficient of the predetermined channel condition, b is the cost weight coefficient of the coded modulation scheme, β is the desired convergence coefficient and β is<1。
9. The system of claim 8, wherein when the feedback is received with data packet loss information, adopting a predetermined P comprising an alternative effective inter-satellite link and an alternative coded modulation schemealter（XiYjZk) Reset Pbest（XrYsZt) And thus, the secondary data transmission is performed.
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