CN114124192A - Coverage extension system and method based on satellite network - Google Patents

Coverage extension system and method based on satellite network Download PDF

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Publication number
CN114124192A
CN114124192A CN202111241448.9A CN202111241448A CN114124192A CN 114124192 A CN114124192 A CN 114124192A CN 202111241448 A CN202111241448 A CN 202111241448A CN 114124192 A CN114124192 A CN 114124192A
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satellite
communication
coverage
communication device
network
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CN114124192B (en
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许晓东
董晴
韩书君
张雪菲
刘睿
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Beijing University of Posts and Telecommunications
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Beijing University of Posts and Telecommunications
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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
    • H04B7/18578—Satellite systems for providing broadband data service to individual earth stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/18521—Systems of inter linked satellites, i.e. inter satellite service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/18—Network planning tools

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Radio Relay Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention provides a coverage extension system and a method based on a satellite network, which relate to the technical field of satellite communication, and the system comprises: the ground area control center is in communication connection with the geosynchronous orbit satellite and is used for acquiring equipment data of communication equipment and establishing communication with the communication equipment based on an access strategy; the near-earth orbit satellite is used for acquiring equipment data of communication equipment and establishing communication with the communication equipment based on the access strategy; the geosynchronous orbit satellite is used for determining the coverage range of the communication equipment based on the equipment data, generating the access strategy based on the coverage range and the access strategy value, and issuing the access strategy to the ground area control center and the low earth orbit satellite. The invention can carry out network dynamic coverage expansion on the nodes with insufficient ground coverage, thereby improving the coverage quality.

Description

Coverage extension system and method based on satellite network
Technical Field
The invention relates to the technical field of satellite communication, in particular to a coverage extension system and method based on a satellite network.
Background
Good coverage is a guarantee to guarantee the quality and indexes of the mobile communication network. With the rapid development of mobile communication, more and more communication devices appear in the network, and in remote areas where ground base stations cannot be established, high-traffic demand areas (hot spot areas) such as the ocean, problems such as coverage holes and weak coverage are likely to occur, and the problems provide challenges for the traditional ground communication network. Compared with the traditional ground communication network, the satellite communication has many advantages, such as wide coverage, large communication system capacity, flexible networking mode, no limitation of geographical conditions and the like. In areas where it is difficult to build a ground base station, satellite communications can be used to provide seamless coverage; satellite communication can be used as coverage supplement when the traffic demand in the hot spot area is too high and the ground base station cannot provide enough service. The conventional satellite-ground cooperative communication research is mostly borne by a single-layer satellite network, but no matter a high-medium orbit and low-earth orbit satellite, the performances in the aspects of time delay, congestion, survivability, bandwidth and the like cannot be considered at the same time, and the double-layer satellite network of the high-low orbit cooperative networking can more effectively utilize satellite resources, has complementary advantages, improves the coverage and access capability and more efficiently meets different service requirements of various types of users.
At present, the satellite communication network has low intelligent degree, so that the utilization rate of communication resources is low, and multi-satellite and multi-beam joint cooperation, intelligent decision and the like are difficult to realize. Therefore, a coverage extension mechanism based on a satellite network, which can realize self-learning and self-optimization of the satellite network, is an important issue to be solved in the industry at present.
Disclosure of Invention
The invention provides a coverage extension system and a coverage extension method based on a satellite network, which are used for solving the defects that in the prior art, coverage holes and weak coverage are easy to occur in communication equipment such as oceans and the like which cannot establish remote areas and data explosive heating point areas of a ground base station, realizing network dynamic coverage extension on nodes with insufficient ground coverage and improving coverage quality.
The invention provides a coverage extension system based on a satellite network, which comprises:
a plurality of low earth orbit satellites and geosynchronous orbit satellites, a plurality of the low earth orbit satellites all with geosynchronous orbit satellites communication connection, this system still includes:
the ground area control center is in communication connection with the geosynchronous orbit satellite and is used for acquiring equipment data of communication equipment and establishing communication with the communication equipment based on an access strategy;
the near-earth orbit satellite is used for acquiring equipment data of communication equipment and establishing communication with the communication equipment based on the access strategy;
the geosynchronous orbit satellite is used for determining the coverage range of the communication equipment based on the equipment data, generating the access strategy based on the coverage range and the access strategy value, and issuing the access strategy to the ground area control center and the low earth orbit satellite;
the equipment data comprises physical space information data, service information data and network state information data; the access policy value is determined based on a distance of the low earth orbit satellite from the communication device, a time period in which the communication device can be serviced, an amount of remaining free resources, a signal-to-noise ratio of a channel, and an effect of implementing an improvement measure against an influence of a weather condition.
According to the coverage extension system based on the satellite network provided by the invention, the geosynchronous orbit satellite comprises:
a determining unit for determining a first coverage range and a second coverage range; the first coverage range is the coverage range of the ground area control center, and the second coverage range is the coverage range of the low earth orbit satellite.
A receiving unit for acquiring the device data from the ground area control center and the low earth orbit satellite;
an on-board control unit, configured to determine a coverage area to which the communication device belongs based on the device data, the first coverage area, and the second coverage area;
and the on-satellite decision unit is used for generating the access strategy based on the coverage range and the access strategy value and sending the access strategy to the ground area control center and the low earth orbit satellite.
According to the coverage extension system based on the satellite network provided by the invention, the on-satellite decision unit comprises:
a first decision unit, configured to issue the access policy to the ground area control center when the communication device is in the first coverage area, and at this time, the communication device establishes communication with the ground area control center;
and a second decision unit, configured to issue the access policy to the low earth orbit satellite whose access policy value is the maximum value when the communication device is in a second coverage range and not in the first coverage range, and at this time, the communication device establishes communication with the low earth orbit satellite whose access policy value is the maximum value.
According to the coverage extension system based on the satellite network provided by the invention, the geosynchronous orbit satellite further comprises:
the demand forecasting unit is used for inputting the equipment data into a cognitive network model to obtain a forecasting service demand output by the cognitive network model; the cognitive network model is obtained by training based on sample equipment data and basic information of the low earth orbit satellite;
correspondingly, the on-satellite decision unit is further configured to generate the access policy based on the coverage area, the access policy value, and the predicted service, and send the access policy to the ground area control center and the low earth orbit satellite.
According to the coverage extension system based on the satellite network provided by the invention, the ground area control center comprises:
the registration marking unit is used for performing network access registration and marking on the communication equipment to obtain registration information; wherein the communication device comprises an on-sea communication device and/or a hotspot area communication device;
the first sensing unit is used for acquiring the device data of the communication device;
a first sending unit, configured to send the device data and the registration information to the receiving unit;
and the first communication unit is used for acquiring the access strategy and establishing communication with the communication equipment based on the access strategy.
According to the coverage extension system based on the satellite network provided by the invention, the on-satellite decision unit further comprises:
a first determination unit configured to determine the access policy value based on a distance from a communication apparatus, a time period in which the communication apparatus can be serviced, a remaining amount of free resources, a signal-to-noise ratio of a channel, and an effect of implementing an improvement measure against an influence of a weather condition, when the communication apparatus is the on-sea communication apparatus;
a second determining unit, configured to determine the access policy value based on a distance from the communication device, a time period in which the communication device can be served, a remaining amount of idle resources, and a signal-to-noise ratio of a channel when the communication device is the hotspot area communication device.
According to the coverage extension system based on the satellite network provided by the invention, the first determining unit specifically comprises:
the access policy value is determined based on weight values respectively corresponding to a distance from the communication device, a time capable of serving the communication device, a remaining amount of idle resources, a signal-to-noise ratio of a channel, and an implementation effect of an improvement measure against the influence of weather conditions, and a sum of the weight values respectively corresponding to the distance from the communication device, the time capable of serving the communication device, the remaining amount of idle resources, the signal-to-noise ratio of the channel, and the implementation effect of the improvement measure against the influence of weather conditions is 1.
According to the coverage extension system based on the satellite network provided by the invention, the second determining unit specifically comprises:
and determining the access strategy value based on weighted values respectively corresponding to the distance to the communication equipment, the time capable of serving the communication equipment, the residual idle resource amount and the signal-to-noise ratio of the channel, wherein the sum of the weighted values respectively corresponding to the distance to the communication equipment, the time capable of serving the communication equipment, the residual idle resource amount and the signal-to-noise ratio of the channel is 1.
According to the coverage extension system based on the satellite network provided by the invention, the low earth orbit satellite comprises:
the second sensing unit is used for acquiring the device data of the communication device;
a second sending unit, configured to send the device data to the receiving unit;
and the second communication unit is used for acquiring the access strategy and establishing communication with the communication equipment based on the access strategy.
The invention also provides a coverage extension method based on the satellite network, which is applied to the high orbit satellite side and comprises the following steps:
determining the first coverage area and the second coverage area;
acquiring the device data and the registration information of the communication device;
inputting the equipment data into the cognitive network model to obtain a predicted service demand output by the cognitive network model;
determining a coverage area to which the communication device belongs based on the device data, the first coverage area and the second coverage area;
generating the access strategy based on the coverage range, the access strategy value and the predicted service requirement, and sending the access strategy to the ground area control center and the low earth orbit satellite; wherein each parameter in the access policy value is determined based on the registration information.
The present invention also provides an electronic device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the satellite network-based coverage extension method as described in any of the above when executing the program.
The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when being executed by a processor, carries out the steps of the satellite network based coverage extension method as set forth in any of the above.
The invention also provides a computer program product comprising a computer program which, when executed by a processor, performs the steps of the method for satellite network based coverage extension as described in any of the above.
The coverage extension system and method based on the satellite network, which are provided by the invention, aim at the problems that communication equipment in remote areas and high-flow demand areas, such as hot spot areas, which cannot establish ground base stations, such as the ocean, is easy to have coverage holes, weak coverage and the like, and provide a satellite-ground integrated network scene combining wide-area coverage, the system and method include a ground area control center, a plurality of low earth orbit satellites and geosynchronous orbit satellites, the ground area control center is connected with the geosynchronous orbit satellite, a plurality of near-earth orbit satellites are connected with the geosynchronous orbit satellite, the method comprises the steps of obtaining equipment data of communication equipment through the network coverage characteristics of high and low earth orbit satellites, wherein the equipment data include but are not limited to physical space-time information, service demand information and network state information, carrying out network dynamic coverage expansion on nodes with insufficient ground coverage, and improving coverage quality.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a coverage extension system based on a satellite network provided by the invention;
FIG. 2 is a schematic structural diagram of a geosynchronous orbit satellite in the coverage extension system based on the satellite network provided by the present invention;
fig. 3 is one of specific structural diagrams of a decision unit on the earth satellite in the coverage extension system based on the satellite network provided by the present invention;
FIG. 4 is a second schematic structural diagram of a geosynchronous orbit satellite in the coverage extension system based on the satellite network according to the present invention;
fig. 5 is a specific structural diagram of a ground area control center in the coverage extension system based on the satellite network according to the present invention;
fig. 6 is a second specific structural diagram of a terrestrial satellite decision unit in the coverage extension system based on the satellite network according to the present invention;
fig. 7 is a specific structural diagram of a low earth orbit satellite in the coverage extension system based on the satellite network provided by the invention;
FIG. 8 is a flowchart illustrating a method for coverage extension based on a satellite network according to the present invention;
FIG. 9 is a schematic diagram of a high-sea scenario in which the coverage extension system and method based on a satellite network according to the present invention are applied to a ground base station;
fig. 10 is a schematic structural diagram of an electronic device provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The cognitive network is a network technology proposed in the academic world in recent years, and introduces a plurality of artificial intelligence technologies into the network to enable the network to have intelligence. Cognitive networks can sense network conditions and then plan, make decisions, and take actions based on these conditions. The method has the self-adaptive capacity to the network environment, the learning capacity of judging the previous decision and judging the future decision, and the learned knowledge is used for guiding the future decision.
At present, the satellite communication network adopted in the prior art has low intelligent degree, so that the utilization rate of communication resources is low, and multi-satellite and multi-beam joint cooperation, intelligent decision and the like are difficult to realize. The coverage extension method based on the satellite network introduces the artificial intelligence technology into the satellite network through the cognitive satellite network, so that the satellite network has the capabilities of self-learning, self-optimization and the like, and the ground coverage supplement is realized.
The coverage extension system based on the satellite network according to the present invention is described below with reference to fig. 1, and the system includes a plurality of low earth orbiting satellites 200 and a geosynchronous orbiting satellite 100, the plurality of low earth orbiting satellites 200 are all communicatively connected to the geosynchronous orbiting satellite 100, and the system further includes:
a ground area control center 300 in communication connection with the geosynchronous orbit satellite 100, the ground area control center 300 configured to obtain device data for the communication device and establish communication with the communication device based on the access policy.
The low earth orbiting satellite 200 is used to acquire device data for the communication device and establish communication with the communication device based on the access policy.
The geosynchronous orbit satellite 100 is configured to determine a coverage area to which the communication device belongs based on the device data, generate an access policy based on the coverage area to which the communication device belongs and the access policy value, and issue the access policy to the ground area control center 300 and the low earth orbit satellite 200.
The low earth orbit satellite 200 intelligently and real-timely senses the device data of the communication devices in a cognitive network manner, and the ground area control center 300 collects the device data of the communication devices in the coverage area as much as possible.
In the system, the device data comprises physical space information data such as position, density and space-time distribution of communication equipment, service information data such as service category and network topology, network state information data such as channel information and the like; the access policy value is determined based on the distance of the low earth orbiting satellite 200 from the communication device (or base station), the time that the communication device can be serviced, the amount of free resources remaining, the signal-to-noise ratio of the channel, and the effectiveness of the implementation of the improvement measures to combat the effects of weather conditions.
The coverage extension system based on the satellite network of the invention provides a satellite-ground integrated network scene combining wide area coverage aiming at the problems that communication equipment in remote areas and high-flow demand areas such as hot spot areas, which cannot establish ground base stations, such as ocean, is easy to have coverage holes and weak coverage, the system and the system include a ground area control center 300, a number of low earth orbiting satellites 200 and geosynchronous orbiting satellites 100, and the ground area control center 300 is connected to the geosynchronous orbit satellite 100, a plurality of the low earth orbit satellites 200 are connected to the geosynchronous orbit satellite 100, the method comprises the steps of obtaining equipment data of communication equipment through the network coverage characteristics of high and low earth orbit satellites, wherein the equipment data include but are not limited to physical space-time information, service demand information and network state information, carrying out network dynamic coverage expansion on nodes with insufficient ground coverage, and improving coverage quality.
The coverage extension system based on a satellite network of the present invention is described below with reference to fig. 2, and a geosynchronous orbit satellite 100 includes:
the determining unit 110 is configured to determine a first coverage area and a second coverage area, in the system, the first coverage area is a coverage area of the ground area control center 300, and the second coverage area is a coverage area of the low earth orbiting satellite 200. It is understood that each of the plurality of low earth orbiting satellites 200 has its corresponding second coverage area, and there may be overlapping coverage areas for the second coverage areas of the plurality of low earth orbiting satellites 200.
A receiving unit 120 for acquiring device data from the ground area control center 300 and the low earth orbiting satellite 200;
the on-satellite control unit 130 is configured to determine, based on the device data, the first coverage area and the second coverage area, a coverage area to which the communication device belongs by combining the acquired real-time first coverage area and the acquired real-time second coverage area, specifically, the communication device may be covered by the first coverage area of the ground area control center 300, may also be covered by the second coverage area of the low earth orbit satellite 200, and may also be covered by the ground area control center 300 and the low earth orbit satellite 200 in the system at the same time.
And the on-board decision unit 140 is configured to generate an access policy based on the coverage area and the access policy value to which the access policy belongs, and issue the access policy to the ground area control center 300 and the low earth orbit satellite 200. The satellite decision unit 140 allocates resources to the communication device or base station with insufficient resources according to conditions such as service requirements and the like and a comprehensive weighted access strategy of multi-attribute decision, provides a satellite-ground communication link, and implements an intelligent coverage strategy according to user service requirements.
It should be noted that, in the coverage extension system based on the satellite network provided by the present invention, the on-board decision unit 140 only generates and issues an optimal access policy corresponding to each communication device, and the access policy instructs the ground area control center 300 or one of the low earth orbiting satellites 200 to establish a communication link with the communication device.
In the following, referring to fig. 3, a coverage extension system based on a satellite network according to the present invention is described, where the on-board decision unit 140 specifically includes:
the first decision unit 141 is configured to issue an access policy to the ground area control center 300 when the communication device is in the first coverage area, and at this time, the communication device establishes communication with the ground area control center 300.
And a second decision unit 142, configured to issue an access policy to the low earth orbiting satellite 200 with the maximum access policy value when the communication device is in the second coverage range and not in the first coverage range, and at this time, the communication device establishes communication with the low earth orbiting satellite 200 with the maximum access policy value.
Because the communication equipment usually belongs to the overlapping coverage area of a plurality of near-earth orbiting satellites 200 at the same time, under the condition of insufficient coverage, different decision parameters need to be considered when the access selection of the near-earth orbiting satellites 200 is carried out, namely, the fact that the access satellite is not far away from the communication equipment is ensured, and the time delay requirement is met; it is also desirable to enable the communication device to have a longer access time to the low earth orbit satellite 200, to handle the traffic data size, and to reduce the loss due to handover; meanwhile, the residual resource amount of the satellite is also considered, all satellite resources are balanced, and the utilization rate of the satellite resources is improved; the signal-to-noise ratio of the received signal should also be considered to ensure quality of service. Therefore, in the system, in order to flexibly select the access strategy according to the service requirements of the communication equipment under each scene, a comprehensive weighted access strategy of multi-attribute decision is adopted.
The coverage extension system based on a satellite network of the present invention is described below with reference to fig. 4, and the geosynchronous orbit satellite 100 further includes:
the demand prediction unit 150 is configured to input the device data into the cognitive network model to obtain a predicted service demand output by the cognitive network model, in the system, the access policy may also be generated based on the coverage area to which the access policy belongs, the access policy value, and the predicted service demand, and the cognitive network model is obtained based on the device data of the sample and the basic information of the low earth orbit satellite 200. The basic information of the low earth orbiting satellite 200 is the distance between the low earth orbiting satellite 200 and the communication device (or the base station), the time for which the communication device can be serviced, the amount of the remaining idle resources, the signal-to-noise ratio of the channel, and the implementation effect of the improvement measure against the influence of the weather condition.
The coverage extension system based on the satellite network extracts and analyzes the data characteristics of the sensed data through a cognitive network model based on deep learning, big data and the like, obtains the change modes and the distribution rules of the service requirements and the position information of the communication equipment under various coverage conditions, can predict the information such as the time period of busy hot spot areas or the position of ocean users, can reserve resources in advance by the satellite, and provides a link establishment application for a ground base station or communication equipment so as to reduce the interaction flow and the user access delay.
Therefore, in the coverage extension system based on the satellite network, the data characteristics of marine users or hot spot areas are analyzed and obtained by using a trained cognitive network model through the intelligent learning capability of the cognitive satellite network, the change modes and the distribution rules of key information of various coverage conditions are obtained, so that the user requests are predicted, the control instruction is generated, the satellite reserves resources, the ground communication is supported in advance, and the coverage quality is improved.
In the following, the coverage extension system based on the satellite network according to the present invention is described with reference to fig. 5, and the ground area control center 300 includes:
the registration marking unit 310 is configured to perform network entry registration and marking on the communication device to obtain registration information, where in the system, the communication device includes an on-sea communication device and/or a hot spot area communication device according to the registration information.
When the communication equipment is registered to access the network, the general communication equipment manages the access information in a ground area control center; communication devices in a remote area where a ground base station cannot be established and a high-traffic demand area (hot spot area) such as the ocean are regarded as special communication devices, and the registration marking unit 310 of the ground area control center 300 marks the special communication devices and then transfers the registration information to the onboard control unit 130 through the first sending unit 330 for cooperative management.
A first sensing unit 320, configured to obtain device data of the communication device.
The first sending unit 330 is configured to send the device data and the registration information to the receiving unit 120, and the receiving unit 120 forwards the corresponding data to the onboard control unit 130.
The first communication unit 340 is configured to acquire the access policy, and establish communication with the communication device based on the access policy.
In the following, referring to fig. 6, a coverage extension system based on a satellite network according to the present invention is described, where the on-board decision unit 140 specifically includes:
a first determination unit 143, configured to determine an access policy value based on a distance from the communication apparatus, a time during which the communication apparatus can be serviced, a remaining amount of free resources, a signal-to-noise ratio of a channel, and an effect of implementing an improvement measure against an influence of a weather condition, when the communication apparatus is an on-sea communication apparatus;
a second determining unit 144, configured to determine, when the communication device is a hotspot area communication device, an access policy value based on a distance from the communication device, a time that the communication device can be served, and a signal-to-noise ratio of the remaining amount of idle resources in your channel.
Specifically, the first determining unit specifically includes:
determining an access strategy value based on weighted values respectively corresponding to the distance from the communication equipment, the time capable of serving the communication equipment, the residual idle resource amount and the signal-to-noise ratio of the channel, wherein the sum of weighted values respectively corresponding to the distance from the communication equipment, the time capable of serving the communication equipment, the residual idle resource amount, the signal-to-noise ratio of the channel and the implementation effect of an improvement measure for resisting the influence of meteorological conditions is 1;
the second determining unit specifically includes:
the access policy value is determined based on weighted values respectively corresponding to the distance from the communication device, the time capable of serving the communication device, the amount of the remaining idle resources, the signal-to-noise ratio of the channel, and the implementation effect of the improvement measure against the influence of the weather condition, and the sum of the weighted values respectively corresponding to the distance from the communication device, the time capable of serving the communication device, the amount of the remaining idle resources, and the signal-to-noise ratio of the channel is 1.
The coverage extension system based on the satellite network of the present invention is described below with reference to fig. 7, and the low earth orbit satellite 200 includes:
a second sensing unit 210, configured to obtain device data of the communication device.
The second sending unit 220 is configured to send the device data to the receiving unit 120, and the receiving unit 120 forwards the corresponding data to the onboard control unit 130.
And a second communication unit 230, configured to acquire the access policy and establish communication with the communication device based on the access policy.
The coverage extension method based on the satellite network according to the present invention is described below with reference to fig. 8, the method includes a ground area control center 300, a plurality of low earth orbit satellites 200, and geosynchronous orbit satellites 100, the ground area control center 300 is connected to the geosynchronous orbit satellites 100, and the plurality of low earth orbit satellites 200 are all connected to the geosynchronous orbit satellites 100, the method is applied to a high earth orbit satellite side, i.e., the geosynchronous orbit satellites 100, and specifically includes the following steps:
s100, determining a first coverage range and a second coverage range.
S200, acquiring the device data and the registration information of the communication device.
S300, inputting the equipment data into the cognitive network model to obtain the predicted service requirement output by the cognitive network model.
S400, determining the coverage range of the communication equipment based on the equipment data, the first coverage range and the second coverage range.
S500, generating an access strategy based on the coverage area, the access strategy value and the predicted service requirement, and sending the access strategy to a ground area control center and a low earth orbit satellite.
In step S500, each parameter in the access policy value is determined based on the registration information. When the registration information of the communication equipment is the maritime communication equipment, the parameters of the access strategy value comprise the distance between the near-earth orbiting satellite 200 and the communication equipment, the time for serving the communication equipment, the amount of the residual idle resources, the signal-to-noise ratio of a channel, the implementation effect of improvement measures for resisting the influence of meteorological conditions and the like; when the registration information of the communication device is the hotspot area control device, the parameters of the access policy value include the distance between the low earth orbit satellite 200 and the communication device, the time for which the communication device can be served, the amount of remaining idle resources, the signal-to-noise ratio of the channel, and the like.
The coverage extension method based on the satellite network of the invention provides a satellite-ground integrated network scene combining wide area coverage aiming at the problems that communication equipment in remote areas and high-flow demand areas such as hot spot areas, which can not establish ground base stations, such as ocean, is easy to have coverage holes and weak coverage, the system and method includes a ground area control center 300, a number of low earth orbiting satellites 200 and geosynchronous orbiting satellites 100, and the ground area control center 300 is connected to the geosynchronous orbit satellite 100, a plurality of the low earth orbit satellites 200 are connected to the geosynchronous orbit satellite 100, the method comprises the steps of obtaining equipment data of communication equipment through the network coverage characteristics of high and low earth orbit satellites, wherein the equipment data include but are not limited to physical space-time information, service demand information and network state information, carrying out network dynamic coverage expansion on nodes with insufficient ground coverage, and improving coverage quality.
According to the coverage extension method based on the satellite network, the communication equipment is marked when the communication equipment is registered in the network, and the communication equipment in a remote area where a ground base station cannot be established, such as the sea, and a high-flow demand area is marked as special communication equipment. Specifically, the coverage extension method based on the satellite network of the present invention manages the network access information and the location of the general communication device in the ground area control center 300; after the special communication device is registered in the ground area control center 300, the ground area control center 300 allocates an Identity Document (ID) number to the special communication device, marks the ID number, and then transfers the ID number to the corresponding geosynchronous orbit satellite 100 (high orbit satellite) to perform network access information and position cooperative management, so as to avoid an authentication process when the near earth orbit satellite 200 (low orbit satellite) accesses later. The high-Low Orbit double-layer satellite Network adopts Software Defined Network (SDN) technology, a control plane is separated from a data plane, a control layer is deployed on a Geosynchronous Orbit (GEO) satellite, and GEO manages and controls a Low Orbit (LEO) satellite and each ground area control center 300 in the Network, so that the ground area control center 300 in the coverage extension method based on the satellite Network is divided into a sea area control center and a hotspot area control center, wherein:
ocean area control center: the method is responsible for the network access registration mark of the communication equipment in the coverage sea area; controlling each ocean shore-based communication system and carrying out information interaction with the ocean shore-based communication systems; the marine communication devices are cooperatively managed with the corresponding geosynchronous orbit satellite 100 for information interaction.
Hot spot area control center: the method is responsible for the communication equipment network access registration mark in the high-flow demand area covered by the communication equipment network access registration mark; performing information interaction with each base station in the area and reporting the base station requirements to the corresponding geosynchronous orbit satellite 100; the hot spot area communication devices are managed in cooperation with the corresponding geosynchronous orbit satellite 100.
Referring to fig. 9, a marine user a belongs to a special communication device, and when registering to access the network, the marine user a first performs network access information and location management in a marine regional control center, including communicationCritical information such as demand and air route, and the like, and the data are uploaded to the corresponding geosynchronous orbit satellite 100 by the ocean area control center. Key information IaComprises the following steps:
Ia＝{Na，Sa，Ra}
wherein N isaID number, S, representing marine user aaFor a predetermined course of a marine user a, RaAnd representing the communication demand initially reported to the center of the ocean area by the marine user a.
Then, the ground area control center 300 acquires and analyzes physical space information data such as the position, density and space-time distribution of the communication equipment, service information data such as the service type and network topology, and network state information data such as channel information in real time; the low earth orbit satellite 200 with sensing function senses physical space information data such as position, density, space-time distribution and the like, service information data such as service type, network topology and the like, and network state information data such as channel information and the like of communication equipment in a coverage area in real time. The ground area control center 300 and the low earth orbit satellite 200 screen the data, sort and sort the data to obtain a data set of the equipment space-time distribution information and key information such as service characteristics of the data set, and upload the key information to the controller of the geosynchronous orbit satellite 100. The interlayer link between the LEO-GEO cognitive satellite networks is mainly used for interaction of key information and operation control information, and can be used as a one-hop arrival transmission path of emergency service requirements when necessary. The coverage extension method based on the satellite network comprises the following specific steps of marine communication equipment and hotspot area communication equipment:
marine communication device: the ocean area control center collects the equipment data of the communication equipment in the coverage range as much as possible; the low earth orbit satellite 200 above the sea area senses and acquires data of the offshore communication equipment in the coverage area in real time and uploads the analysis result to the geosynchronous orbit satellite 100. The perception data of the sea area control center is mainly a sea user track, and sea users mostly follow a certain route, so that different sea user communication equipment has correlation in the determined position and the determined environment; weather conditions such as marine weather and sea surface fluctuation are adopted to estimate or predict the channel condition of marine communication; the network state of the communication equipment is used for judging whether the communication equipment is in a weak coverage or coverage hole state; traffic class and demand.
Hotspot area communication equipment: the method comprises the steps that a hot spot area ground control center obtains equipment data and base station requirements of communication equipment in a coverage area of the hot spot area ground control center in real time; the low earth orbit satellite 200 located above the hot spot region senses and acquires various data of the communication device and base station requirements in real time, and uploads the analysis result to the geosynchronous orbit satellite 100. Sensing data of a ground control center of a hot spot area mainly meet communication requirements of each base station in the area, and the network state of each communication device is the queuing and packet loss condition so as to judge whether the hot spot area is in a weak coverage state or not; physical information such as location, density, spatial-temporal distribution, etc. of the communication device; traffic class and demand, and traffic busy periods, etc.
The geosynchronous orbit satellite 100 analyzes the acquired data of the marine communication devices and the hot spot area communication devices, and prepares for a later access decision.
The coverage extension method based on the satellite network according to the present invention will be described below by taking a remote area where a ground base station cannot be established, such as the ocean, as an example.
Referring to fig. 9, fig. 9 is a schematic diagram of an open sea scene where a ground base station cannot cover, a sea area control center, such as a sea area base station (shore-based communication base station), collects the service requirements, network states, motion trajectories, etc. of a sea user a as much as possible within a coverage area, and reports these information to the sea area control center in real time, and the sea area control center reports these information to a corresponding geosynchronous orbit satellite 100. The near-earth orbiting satellite 200 above the far-sea area senses and acquires information such as sea surface conditions, meteorological conditions, navigation tracks, network states, service requirements, user ID numbers and the like of the sea area where the marine user a is located in real time, screens data, and uploads the screened data to the corresponding geosynchronous orbiting satellite 100. The data set after screening is:
I′a＝{Na，S′a，Wa，La，Pa}
wherein N isaID number, S 'of marine user a'aIs the actual airline line of marine user a, S'a＝{(t1，p1)(t2，p2)...(tn，pn)}，(tn，pn) Representing marine user a at time tnAt the sea surface pnW isaRepresenting a set of sea-surface meteorological conditions, Wa＝{wt1，wt2...wtn}，wtnRepresents the time tnWeather conditions, La＝{da，TaDenotes the sea user a service, daData size, T, representing a serviceaFor maximum delay tolerance of traffic, PaRepresenting the received Signal Power (Reference Signal Receiving Power, RSRP) of user a.
When the offshore user a navigates away from the coverage area of the control center of the marine area and the RSPP thereof is less than or equal to-105 dBm, the marine area base station (shore-based communication base station) reports the information to the control center of the marine area and the corresponding geosynchronous orbit satellite 100. Meanwhile, the low earth orbit satellite 200 above the sea area also monitors that the RSRP of the maritime user a is less than or equal to-105 dBm, which indicates that the maritime user a enters the open sea area.
At this time, the low earth orbiting satellite 200 accesses the marine user a for auxiliary communication. Taking fig. 9 as an example, the marine user a is in the overlapping coverage area of two low earth orbit satellites 200, and the geosynchronous orbit satellite 100 flexibly selects an access strategy according to the business requirements of the marine user a. According to the user service requirement, adopting a multi-attribute decision-making comprehensive weighted access strategy, and adopting an access strategy LEOAccessComprises the following steps:
Figure BDA0003319679050000171
wherein the access policy value
Figure BDA0003319679050000172
The largest value satellite accesses the marine user a,
Figure BDA0003319679050000173
the value is determined by the distance between the satellite i and the marine user a, the time for serving the marine user a, the amount of the spare resources left by the satellite i, the signal-to-noise ratio of the channel from the satellite i to the marine user a, and the implementation effect of the improvement measure for resisting the influence of the meteorological condition by the satellite i. Each factor has its own weight and the sum is 1, and the geosynchronous orbit satellite 100 can dynamically adjust each weighting coefficient according to the demand and actual situation of the marine user a. The geosynchronous orbit satellite 100 calculates according to each parameter of the maritime user a service and the ephemeris information
Figure BDA0003319679050000174
Figure BDA0003319679050000175
The most valuable low earth orbiting satellite 200 provides coverage support for accessing marine user a.
Since the sea area channel is affected by the sea condition and the weather condition, the coverage extension method based on the satellite network can estimate or predict the channel condition of the sea area channel by analyzing historical data by using a decision tree algorithm, and then selects the accessed low earth orbit satellite 200 to match the channel condition and guarantee the service quality. Most of the users of the open sea large ship follow a certain air route, the navigation routes of different users have overlapping performance, and the positions and service requirements of the users can be predicted by utilizing the overlapping performance, so that a communication link is provided. The cognitive network model of the LEO-GEO cognitive satellite network analyzes accumulated historical data by using a decision tree algorithm, and the general route rule, weather condition, channel condition, service requirement and the like of a user can be obtained.
Prediction scheme for analyzing historical data using decision tree algorithm
Figure BDA0003319679050000176
Comprises the following steps:
Figure BDA0003319679050000177
wherein, each key information estimation value of the offshore user a at n moments is obtained from historical data with the length order of m, and a data set is predicted
Figure BDA0003319679050000181
ta1Indicating the time of insufficient a coverage of the marine user, pa1Indicating a location of insufficient coverage by the marine user a, wa1Indicating the weather and sea situation of the marine user a when the coverage is insufficient, La1Representing the business needs of marine user a.
According to the prediction data obtained by the Q learning algorithm and the decision tree algorithm, before the marine user a reaches the corresponding open sea position with insufficient coverage, the geosynchronous orbit satellite 100 sends a control instruction to the marine user a according to the ephemeris information and the user information
Figure BDA0003319679050000182
The low earth orbit satellite 200 with the maximum value indicates the reserved resource, matches the sea channel condition, provides a communication link for the marine user a, and modifies the action according to the coverage signal receiving strength of the marine user a and the feedback given by the access satellite time delay until finding the optimal strategy of the access selection decision under the dynamic environment, so as to realize the blind compensation of the high sea communication.
For a marine user a, which belongs to the overlapping coverage area of two low earth orbit satellites 200 at the same time, the updating formula of the Q learning algorithm value function is as follows:
Figure BDA0003319679050000183
wherein:
S＝{{D1，T1，B1，S1，W1，La}，{D2，T2 B2，S2，W2，La}，t1，p1，La1}，Direpresenting the distance, T, of the low earth orbiting satellite i from the user aiRepresenting the time at which the low earth orbiting satellite i can serve the marine user a, BiRepresenting a near-earth orbitSatellite i remaining free resource amount, SiSignal-to-noise ratio, W, representing signals of a low earth orbit satellite iiRepresenting the improvement made by the low-earth orbiting satellite i to resist the effects of changing the fundamental characteristics of the signal due to meteorological conditions, LaRepresenting the business needs of marine user a, La＝{da，Ta}; motion space a ═ { LEO ═ LEO1，LEO2And the A adopts an epsilon-greedy strategy to conduct action selection guidance; defining a feedback function r (s, a) ═ ωpPa+ωtTa，PaRepresenting the received signal-to-noise ratio, T, of the marine user a after accessing the low earth orbit satellite 200aRepresenting the time, omega, required for a marine user a to access the low earth orbit satellite 200pAnd ωtWeights corresponding to the relevant parameters respectively; alpha is the learning rate and gamma is the discount factor; maxa′∈AQt(s ', a') is the maximum of the median function for the next wheel state.
The coverage extension method based on the satellite network of the present invention is further described below by taking a business center as an example.
The communication equipment of the business center also belongs to special communication equipment, network access information and position management is firstly carried out in a hotspot area control center during network access registration, the hotspot area control center distributes ID numbers to the communication equipment, and the data are uploaded to the corresponding geosynchronous orbit satellite 100.
In the coverage area, the hotspot area control center, for example, a hotspot area base station, collects service requirements, network states, location information, etc. of each communication device, and reports the information to the hotspot area control center in real time, and the hotspot area control center reports the information to the corresponding geosynchronous orbit satellite 100. Specifically, the base stations in the hot spot region report the demand to the low earth orbiting satellite 200 when their resources are insufficient. The low earth orbit satellite 200 above the hot spot region acquires information such as base station resource requirements, network states of communication equipment, service requirements and the like of the hot spot region in real time, and uploads key information to the corresponding geosynchronous orbit satellite 100 after data screening.
Assuming that the number of the commercial center base stations is M, the formed set M is {1, 2.. M }, and the number of the communication devices is MN, the set of N ═ {1, 2.. N }; the information acquired by the geosynchronous orbit satellite 100 is I { { b { (b)1，b2...bm}，{L1，L2...Ln} in which b isiThe resource requirement reported by the base station i to the satellite is represented, i belongs to {1, 2.. m }, and L belongs toj＝{aj，Tj，NjDenotes the traffic demand of the communication device j, ajRepresenting the data size of the communication device j service; t isjMaximum delay tolerance for traffic; n is a radical ofjAnd numbering the ID of the communication equipment, wherein j belongs to {1, 2.. n }.
When the near-earth orbiting satellite 200 monitors that the resources of the base station are insufficient or some communication devices queue for packet loss, the access base station or the communication devices assist in communication. If the base station is accessed, the base station shares some services which have low requirements on time delay, so that the base station is reserved with the services which have high requirements on time delay and are processed by capacity; if the communication equipment is accessed, the communication equipment with low requirement on time delay of the service is selected to be accessed.
The base station or the communication equipment generally belongs to the overlapping coverage area of a plurality of low earth orbit satellites 200 at the same time, and the geosynchronous orbit satellite 100 adopts a comprehensive weighted access strategy LEO of multi-attribute decision according to the service requirement of the base station or the communication equipmentAccessIndicates to
Figure BDA0003319679050000191
The largest value of the low earth orbiting satellite 200 accesses a base station or communication device.
Figure BDA0003319679050000201
Wherein the access policy value
Figure BDA0003319679050000202
The satellite access user a with the largest value,
Figure BDA0003319679050000203
the value is determined by the distance of the satellite i from the communication device or base station, the time at which the service can be provided, the amount of free resources remaining in the satellite i and the amount of resources remaining in the satellite iAnd the signal-to-noise ratio of the satellite i to communication device or base station channel. Each factor has its own weight, and the sum is 1, and the geosynchronous orbit satellite 100 dynamically adjusts each weight coefficient according to the requirements and actual conditions of the communication equipment or base station. The GEO calculates according to each parameter of communication equipment or base station service and ephemeris information
Figure BDA0003319679050000204
Indication of
Figure BDA0003319679050000205
The largest value of the low earth orbiting satellite 200 access base stations or communication devices provide coverage support.
The cognitive network model of the LEO-GEO cognitive satellite network analyzes accumulated historical data by using a decision tree algorithm, analyzes the resource requirements of a base station and the queuing and packet loss conditions of communication equipment, and can obtain the distribution rule and corresponding service characteristics of the business center in busy time periods.
The prediction scheme for analyzing the historical data of the base station by using the decision tree algorithm is
Figure BDA0003319679050000206
Wherein, each key estimation value of the base station i at the time n is obtained by historical data with the length order of m, and a prediction data set X is obtained1＝{bi1，T1，Qd}，bi1Represents the resource requirement, T, reported by the base station i to the satellite1In busy periods, QdAnd queuing packet loss conditions for each communication device.
According to the Q learning algorithm, before the busy period arrives, the geosynchronous orbit satellite 100 sends a control instruction to the satellite according to ephemeris information and prediction data
Figure BDA0003319679050000207
The near-earth orbiting satellite 200 with the largest value indicates the reserved resource, shares the service with high delay tolerance for the ground base station, and reserves the service with high capacity processing requirement on delay for the base station; or access to servicesAnd communication equipment with low time delay requirement. The advantages of wide satellite coverage and low ground delay are fully utilized, the queuing delay and the packet loss rate of the user are reduced, and the service quality of the user is ensured. In the process, actions are modified according to average queuing delay of users in the hot spot area and feedback given by packet loss rate until an optimal strategy of access selection decision in a dynamic environment is found, so that coverage enhancement of the hot spot area is realized.
For example, for a particular base station m, assuming that it often belongs to the overlapping coverage area of two low earth orbiting satellites 200 at the same time, the update formula of the Q learning algorithm value function is as follows:
Figure BDA0003319679050000211
wherein:
S＝{{D1，T1，B1，S1，Lm}，{D2，T2，B2，S2，Lm}，t1，p1，Ln}，Direpresenting the distance, T, of the low earth orbit satellite i from the base station miRepresenting the time at which the low earth orbiting satellite i can serve the base station m, BiRepresenting the remaining amount of free resources, S, of the low earth orbit satellite iiRepresenting the signal-to-noise ratio of the received signal of the low earth orbit satellite i; l ismRepresenting base station m communication needs; motion space a ═ { LEO ═ LEO1，LEO2And the A adopts an epsilon-greedy strategy to conduct action selection guidance; defining a feedback function r (s, a) ═ ωpdm+ωtpm，dmRepresenting the average queuing delay, p, of users in the coverage area of base station mmRepresenting the packet loss rate of users in the coverage area of the base station m, omegapAnd ωtWeights corresponding to the relevant parameters respectively; alpha is the learning rate and gamma is the discount factor; maxa′∈AQt(s ', a') is the maximum of the median function for the next wheel state.
Therefore, in the coverage extension method based on the satellite network, the data characteristics of marine users or hot spot areas are analyzed and obtained by using a trained cognitive network model through the intelligent learning capability of the cognitive satellite network, the change mode and the distribution rule of key information of various coverage conditions are obtained, the user request is predicted, and therefore a control instruction is generated, resources are reserved for the satellite, ground communication support is given in advance, and the coverage quality is improved.
Fig. 10 illustrates a physical structure diagram of an electronic device, and as shown in fig. 10, the electronic device may include: a processor (processor)810, a communication Interface 820, a memory 830 and a communication bus 840, wherein the processor 810, the communication Interface 820 and the memory 830 communicate with each other via the communication bus 840. The processor 810 may invoke logic instructions in the memory 830 to perform a satellite network based coverage extension method comprising the steps of:
s100, determining the first coverage range and the second coverage range;
s200, acquiring the equipment data and the registration information of the communication equipment;
s300, inputting the equipment data into the cognitive network model to obtain a predicted service demand output by the cognitive network model;
s400, determining the coverage area of the communication equipment based on the equipment data, the first coverage area and the second coverage area;
s500, generating the access strategy based on the coverage area, the access strategy value and the predicted service requirement, and sending the access strategy to the ground area control center and the low earth orbit satellite; wherein each parameter in the access policy value is determined based on the registration information.
In addition, the logic instructions in the memory 830 may be implemented in software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product, the computer program product including a computer program, the computer program being stored on a non-transitory computer-readable storage medium, wherein when the computer program is executed by a processor, a computer is capable of executing the coverage extension method based on a satellite network provided by the above methods, and the method includes the following steps:
s100, determining the first coverage range and the second coverage range;
s200, acquiring the equipment data and the registration information of the communication equipment;
s300, inputting the equipment data into the cognitive network model to obtain a predicted service demand output by the cognitive network model;
s400, determining the coverage area of the communication equipment based on the equipment data, the first coverage area and the second coverage area;
s500, generating the access strategy based on the coverage area, the access strategy value and the predicted service requirement, and sending the access strategy to the ground area control center and the low earth orbit satellite; wherein each parameter in the access policy value is determined based on the registration information.
In yet another aspect, the present invention also provides a non-transitory computer-readable storage medium having stored thereon a computer program, which when executed by a processor, implements a method for satellite network-based coverage extension provided by the above methods, the method comprising the steps of:
s100, determining the first coverage range and the second coverage range;
s200, acquiring the equipment data and the registration information of the communication equipment;
s300, inputting the equipment data into the cognitive network model to obtain a predicted service demand output by the cognitive network model;
s400, determining the coverage area of the communication equipment based on the equipment data, the first coverage area and the second coverage area;
s500, generating the access strategy based on the coverage area, the access strategy value and the predicted service requirement, and sending the access strategy to the ground area control center and the low earth orbit satellite; wherein each parameter in the access policy value is determined based on the registration information.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A satellite network-based coverage extension system, comprising:
a plurality of low earth orbit satellites and geosynchronous orbit satellites, a plurality of low earth orbit satellites all with geosynchronous orbit satellites communication connection, its characterized in that, this system still includes:
the ground area control center is in communication connection with the geosynchronous orbit satellite and is used for acquiring equipment data of communication equipment and establishing communication with the communication equipment based on an access strategy;
the near-earth orbit satellite is used for acquiring equipment data of communication equipment and establishing communication with the communication equipment based on the access strategy;
the geosynchronous orbit satellite is used for determining the coverage range of the communication equipment based on the equipment data, generating the access strategy based on the coverage range and the access strategy value, and issuing the access strategy to the ground area control center and the low earth orbit satellite;
the equipment data comprises physical space information data, service information data and network state information data; the access policy value is determined based on a distance of the low earth orbit satellite from the communication device, a time period in which the communication device can be serviced, an amount of remaining free resources, a signal-to-noise ratio of a channel, and an effect of implementing an improvement measure against an influence of a weather condition.
2. The satellite network-based coverage extension system of claim 1, wherein the geosynchronous orbit satellite comprises:
a determining unit for determining a first coverage range and a second coverage range; the first coverage range is the coverage range of the ground area control center, and the second coverage range is the coverage range of the low earth orbit satellite.
A receiving unit for acquiring the device data from the ground area control center and the low earth orbit satellite;
an on-board control unit, configured to determine a coverage area to which the communication device belongs based on the device data, the first coverage area, and the second coverage area;
and the on-satellite decision unit is used for generating the access strategy based on the coverage range and the access strategy value and sending the access strategy to the ground area control center and the low earth orbit satellite.
3. The satellite network-based coverage extension system of claim 2, wherein the on-board decision unit comprises:
a first decision unit, configured to issue the access policy to the ground area control center when the communication device is in the first coverage area, and at this time, the communication device establishes communication with the ground area control center;
and a second decision unit, configured to issue the access policy to the low earth orbit satellite whose access policy value is the maximum value when the communication device is in a second coverage range and not in the first coverage range, and at this time, the communication device establishes communication with the low earth orbit satellite whose access policy value is the maximum value.
4. The satellite network-based coverage extension system of claim 2, wherein the geosynchronous orbit satellite further comprises:
the demand forecasting unit is used for inputting the equipment data into a cognitive network model to obtain a forecasting service demand output by the cognitive network model; the cognitive network model is obtained by training based on sample equipment data and basic information of the low earth orbit satellite;
correspondingly, the on-satellite decision unit is further configured to generate the access policy based on the coverage area, the access policy value, and the predicted service, and send the access policy to the ground area control center and the low earth orbit satellite.
5. The satellite network-based coverage extension system of claim 3, wherein the ground area control center comprises:
the registration marking unit is used for performing network access registration and marking on the communication equipment to obtain registration information; wherein the communication device comprises an on-sea communication device and/or a hotspot area communication device;
the first sensing unit is used for acquiring the device data of the communication device;
a first sending unit, configured to send the device data and the registration information to the receiving unit;
and the first communication unit is used for acquiring the access strategy and establishing communication with the communication equipment based on the access strategy.
6. The satellite network-based coverage extension system of claim 5, wherein the on-board decision unit further comprises:
a first determination unit configured to determine the access policy value based on a distance from a communication apparatus, a time period in which the communication apparatus can be serviced, a remaining amount of free resources, a signal-to-noise ratio of a channel, and an effect of implementing an improvement measure against an influence of a weather condition, when the communication apparatus is the on-sea communication apparatus;
a second determining unit, configured to determine the access policy value based on a distance from the communication device, a time period in which the communication device can be served, a remaining amount of idle resources, and a signal-to-noise ratio of a channel when the communication device is the hotspot area communication device.
7. The coverage extension system based on the satellite network as claimed in claim 6, wherein the first determining unit specifically comprises:
the access policy value is determined based on weight values respectively corresponding to a distance from the communication device, a time capable of serving the communication device, a remaining amount of idle resources, a signal-to-noise ratio of a channel, and an implementation effect of an improvement measure against the influence of weather conditions, and a sum of the weight values respectively corresponding to the distance from the communication device, the time capable of serving the communication device, the remaining amount of idle resources, the signal-to-noise ratio of the channel, and the implementation effect of the improvement measure against the influence of weather conditions is 1.
8. The satellite network-based coverage extension system of claim 6, wherein the second determining unit specifically comprises:
and determining the access strategy value based on weighted values respectively corresponding to the distance to the communication equipment, the time capable of serving the communication equipment, the residual idle resource amount and the signal-to-noise ratio of the channel, wherein the sum of the weighted values respectively corresponding to the distance to the communication equipment, the time capable of serving the communication equipment, the residual idle resource amount and the signal-to-noise ratio of the channel is 1.
9. The satellite network-based coverage extension system of claim 3, wherein the low earth orbit satellite comprises:
the second sensing unit is used for acquiring the device data of the communication device;
a second sending unit, configured to send the device data to the receiving unit;
and the second communication unit is used for acquiring the access strategy and establishing communication with the communication equipment based on the access strategy.
10. A coverage extension method based on a satellite network, which is implemented by a coverage extension system based on a satellite network according to any one of claims 1 to 9, and is applied to the side of an elevated satellite, and is characterized by comprising the following steps:
determining the first coverage area and the second coverage area;
acquiring the device data and the registration information of the communication device;
inputting the equipment data into the cognitive network model to obtain a predicted service demand output by the cognitive network model;
determining a coverage area to which the communication device belongs based on the device data, the first coverage area and the second coverage area;
generating the access strategy based on the coverage range, the access strategy value and the predicted service requirement, and sending the access strategy to the ground area control center and the low earth orbit satellite; wherein each parameter in the access policy value is determined based on the registration information and ephemeris information.
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