CN113965252A - Multi-satellite networking method for joint control of link layer and network layer - Google Patents
Multi-satellite networking method for joint control of link layer and network layer Download PDFInfo
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
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- H04B7/18528—Satellite systems for providing two-way communications service to a network of fixed stations, i.e. fixed satellite service or very small aperture terminal [VSAT] system
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18539—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
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- H—ELECTRICITY
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- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
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Abstract
The invention discloses a multi-satellite networking method for joint control of a link layer and a network layer, and relates to the field of satellite communication. According to the method, when a satellite terminal applies for accessing a satellite network, a link layer dynamically selects an access beam and a port, and triggers a network layer to execute registration and whole network diffusion of user routing, so that interaction times and bandwidth overhead of a networking protocol are reduced, and rapid routing convergence and rapid terminal access are realized. The invention can reduce the network access time and the route convergence time of the multi-satellite networking system and improve the random access network capability.
Description
Technical Field
The invention relates to the technical field of satellite communication, in particular to a multi-satellite networking method for joint control of a link layer and a network layer.
Background
Satellite communications have been developed for over half a century. Satellite communication has become one of the irreplaceable core communication means because it has a series of advantages of global coverage, no restriction by ground obstacles, rapid deployment and the like, can provide stable communication capability for multiple users crossing the intercontinental region and the ocean, and can also provide effective information transmission in sudden events of regions with unpredictable places, times and intensities. Satellite communication technology also becomes an important index for measuring the core competitiveness of a country.
Nowadays, with the promotion and development of on-satellite loading technology, satellite communication systems gradually develop towards on-satellite processing, space networking and world fusion. The multi-satellite cooperation gradually replaces a single satellite to become a mainstream satellite network topology. However, in a multi-satellite networking scenario, the prior art also has the problems that the route cannot be converged quickly, and the terminal is difficult to access the network quickly.
Disclosure of Invention
In view of this, the invention provides a multi-satellite networking method with joint control of a link layer and a network layer, which can enable network routing to be converged quickly and a satellite terminal to access the network quickly.
In order to achieve the purpose, the invention adopts the technical scheme that:
a multi-satellite networking method for link layer and network layer joint control is realized by joint control of satellite-borne network control of a link layer and access routing service and backbone routing service of the network layer, and comprises the following steps:
A. the method comprises the following steps that satellites and ground gateway stations of a multi-satellite system form a space-based backbone network through inter-satellite links and feeder links, backbone routing protocols are interacted between backbone routing services of adjacent satellites and ground gateway stations, a unicast forwarding table and a broadcast forwarding table of inter-satellite paths are generated and are configured to switching equipment of each satellite or ground gateway station;
B. setting at least one access routing service in a multi-satellite system, wherein each access routing service is responsible for managing routing mapping information of one or more satellites, and the routing mapping information of the service is mutually diffused among the access routing services to complete the learning of the routing mapping information of the whole network and periodically broadcast the routing mapping information to satellite terminals of satellites under the jurisdiction of the service;
C. the satellite network operation and maintenance system configures access route service addresses of all the satellites and broadcasts the access route service addresses to the satellite terminals under the satellites of all the satellites through satellite-to-ground announcement;
D. the satellite terminal is started, one network-accessing satellite is selected from a multi-satellite system, and the synchronous acquisition of global signaling beams of the network-accessing satellite is executed; then, the satellite terminal receives the satellite-ground announcement to obtain an access routing service address of the network-accessing satellite;
E. the satellite terminal sends a random access application to a satellite-borne network control of the network-accessing satellite through a signaling wave beam; after receiving the application, the satellite-borne network control selects a temporary wave beam and a port for network access for the satellite terminal and allocates a terminal special control channel under the temporary wave beam; the information of the temporary wave beam, the port and the special control channel of the terminal is informed to the satellite terminal through the network access allowing signaling;
F. the satellite terminal performs synchronous acquisition on the temporary wave beam; then, sending a network access authentication application to the satellite-borne network control through a terminal dedicated control channel; the satellite-borne network control organizes the authentication and key agreement process of the satellite terminal; after all the processes are finished, a successful network access authentication signaling is sent to the satellite terminal; if a VLAN virtual subnet or a working beam is configured for the satellite terminal, the related working parameters are carried in a successful network access authentication signaling and are issued to the satellite terminal;
G. the satellite terminal checks whether a working beam is configured, if the working beam exists, the satellite terminal tries to execute synchronous acquisition of the working beam, and if the synchronous acquisition is successful, the satellite terminal continues to execute the synchronous acquisition of the working beam; otherwise, jumping to the step I;
H. the satellite terminal sends a position updating application to the satellite-borne network control through a terminal special control channel of the temporary wave beam to request to switch to the working wave beam; the satellite-borne network control reserves a special control channel for the satellite terminal under the working beam and responds to accept signaling by position updating; then, the satellite terminal is switched to a working beam, and a position updating confirmation signaling is sent to the satellite-borne network control through a reserved special control channel; after receiving the position updating confirmation signaling, the satellite-borne network control releases the temporary wave beam and the special control channel resource thereof;
I. the satellite terminal carries the information of the current satellite, the wave beam, the port and the virtual subnet in the network access notification and sends the information to the access routing agent of the terminal, and the access routing agent generates the routing mapping information of the terminal;
J. the satellite terminal applies for sending resources through a special control channel of a current beam; the satellite-borne network control allocates a service channel under the current beam; the satellite terminal sends the route mapping information of the terminal to the access route service of the network-accessing satellite through a service channel, and executes route registration;
K. the access routing service of the network-accessing satellite updates the whole network routing mapping information of the service, sends routing registration response to the satellite terminal and simultaneously diffuses the update notification of the routing mapping information to other access routing services in the system; other access routing services in the system update the whole network routing mapping information of the service and broadcast the information to the satellite terminals under jurisdiction of the satellite;
l, the satellite terminal receives broadcast information mapped by the whole network route, and sends a resource release application to the satellite-borne network control after confirming that the route registration is successful; the satellite-borne network control releases the service channel and checks whether the current wave beam of the terminal is a temporary wave beam, if so, the operation is continued; otherwise, jumping to the step O;
m, the satellite-borne network controls to release the temporary wave beam of the satellite terminal and informs the access routing service of the satellite to update the wave beam and the port of the satellite terminal to 'none'; the access routing service updates the whole network routing mapping information of the service, and simultaneously diffuses the updating notice of the routing mapping information to other access routing services in the system; other access routing services in the system update the whole network routing mapping information of the service and broadcast the information to the satellite terminals under jurisdiction of the satellite;
n, the satellite terminal is switched to a signaling beam;
and O, the satellite terminal is switched into a standby state.
In step B, the route mapping information mainly includes user route information of the satellite terminal, the MAC address, the satellite, the port, and the like.
In step B, step K and step M, each access routing service realizes the diffusion of routing mapping information based on the broadcast forwarding table generated in step A.
The invention has the beneficial effects that:
1. according to the invention, when the satellite terminal applies for accessing the satellite network, the link layer dynamically selects the network access beam and the port, and triggers the network layer to execute the registration and the whole network diffusion of the user route, so that the interaction times and the bandwidth overhead of the networking protocol are reduced, and the rapid convergence of the route and the rapid network access of the terminal are realized.
2. The method can be used in a multi-satellite networking application scene with on-satellite processing, can reduce the network access time and the route convergence time of a multi-satellite networking system, and improves the random access network capability.
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FIG. 1 is a schematic diagram of a scenario of an embodiment of the present invention.
Fig. 2 is a flow chart of an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description.
Fig. 1 shows an application scenario of a satellite terminal accessing a network in a multi-satellite networking system, where the system includes the satellite terminal, a satellite load, and a ground gateway station. Wherein: deploying a network control agent and an access routing agent in the satellite terminal; deploying satellite-borne switching, satellite-borne network control, backbone routing service and access routing service in the satellite load; and deploying the backbone routing service, the switching equipment and the satellite network operation and maintenance system in the ground gateway station. The satellite terminal is connected with the satellite load through a satellite-ground link; all satellite loads are connected through inter-satellite links; the satellite load is connected with the ground gateway through a feeder link.
A multi-satellite networking method for link layer and network layer joint control is realized by joint control of satellite-borne network control of the link layer and access routing service and backbone routing service of the network layer. In the method, a network control agent in a satellite terminal is responsible for initiating network access authentication, and an access routing agent is responsible for initiating routing registration; satellite-borne exchange in satellite loads is responsible for forwarding of routing information and signaling, satellite-borne network control is responsible for distribution and release of network access beams, control channels and service channels of satellite terminals, backbone routing service is responsible for routing calculation of paths among satellites, and access routing service is responsible for collection and diffusion of routing mapping information; the satellite network operation and maintenance system in the ground gateway station is responsible for configuring access routing service addresses of all satellites, virtual subnets of satellite terminals and working beams, and the backbone routing service and switching equipment have the same functions as those of the backbone routing service and switching equipment in satellite loads. A global beam, a phased array beam and a mechanical spot beam are respectively configured in the satellite payload. Wherein: the global beam is used as a signaling beam of the satellite terminal; the phased array wave beam is used as a temporary wave beam of the satellite terminal in the network access stage; the mechanical spot beam is used as the operating beam for the satellite terminal.
Specifically, as shown in fig. 2, the method includes the steps of:
A. the satellite and ground gateway stations of the multi-satellite system form a space-based backbone network through inter-satellite links and feeder links. An IS-IS routing protocol IS adopted between backbone routing services of adjacent satellites and ground gateway stations to generate a unicast forwarding table and a broadcast forwarding table of an inter-satellite path, and the unicast forwarding table and the broadcast forwarding table are configured to switching equipment of each satellite or ground gateway station.
B. And setting access routing service in the satellite load of each satellite, and managing the routing mapping information of the satellite, wherein the routing mapping information comprises user routing and information of a satellite terminal MAC address, a satellite, a port, a virtual subnet and the like corresponding to the routing. And mutually diffusing the route mapping information of the access route services among the access route services, finishing the learning of the whole network route mapping information, and periodically broadcasting the route mapping information to the satellite terminals of the satellites governed by the access route services.
C. The satellite network operation and maintenance system configures the access routing service address of each satellite and broadcasts the access routing service address to the satellite terminals under each satellite through the satellite-ground announcement.
D. The satellite terminal is started, one network-accessing satellite is selected in the multi-satellite system, and the synchronous acquisition of the global signaling wave beam of the network-accessing satellite is executed. And then, the satellite terminal receives the satellite-ground announcement to obtain an access routing service address of the network-accessing satellite.
E. The satellite terminal sends a random access application to a satellite-borne network control of the network-accessing satellite through a global beam; after receiving the application, the satellite-borne network control selects an available phased array wave beam as a temporary wave beam for network access for the satellite terminal and allocates a terminal special control channel under the phased array wave beam; information such as beams, ports, and terminal-specific control channels is notified to the satellite terminal through the network-access-allowed signaling.
F. The satellite terminal performs synchronous acquisition of the phased array beam. Then, sending a network access authentication application to the satellite-borne network control through a terminal dedicated control channel; the satellite-borne network control organizes the authentication and key agreement process of the satellite terminal; and after all the processes are finished, sending a network access authentication success signaling to the satellite terminal. If a virtual subnet (VLAN) or a mechanical spot beam for subsequent work is configured for the satellite terminal, the related working parameters are carried in a successful network access authentication signaling and are issued to the satellite terminal.
G. The satellite terminal checks whether a mechanical spot beam for subsequent work is configured, if yes, synchronous acquisition of the mechanical spot beam is tried to be executed, and if the synchronous acquisition is successful, the synchronous acquisition is continued; otherwise, jumping to I.
H. The satellite terminal sends a position updating application to the satellite-borne network control through a terminal special control channel of the phased array wave beam to request to switch to the mechanical spot wave beam; the satellite-borne network control reserves a special control channel for the satellite terminal under the mechanical spot beam and responds to accept signaling by position updating; then, the satellite terminal is switched to the mechanical spot beam, and a position updating confirmation signaling is sent to the satellite-borne network control through a reserved special control channel; and after the satellite-borne network control receives the position updating confirmation signaling, the phased array wave beam and the special control channel resource thereof are released.
I. The satellite terminal carries information such as a satellite, a beam, a port, a virtual subnet and the like which is currently located in the network access notification and sends the information to an access routing agent of the terminal, and the access routing agent generates routing mapping information of the terminal.
J. The satellite terminal applies for sending resources through a special control channel of a current beam; the satellite-borne network control allocates a service channel under the current beam; the satellite terminal sends the route mapping information of the terminal to the access route service of the network-accessing satellite through the service channel, and executes route registration.
K. The access routing service of the network-accessing satellite updates the whole network routing mapping information of the service, sends routing registration response to the satellite terminal and simultaneously diffuses the update notification of the routing mapping information to other access routing services in the system; other access routing services in the system update the whole network routing mapping information of the service and broadcast the information to the satellite terminals under the jurisdiction of the satellite.
L, the satellite terminal receives broadcast information mapped by the whole network route, and sends a resource release application to the satellite-borne network control after confirming that the route registration is successful; the satellite-borne network control releases a service channel and checks whether the current wave beam of the terminal is a phased array wave beam, and if the current wave beam of the terminal is the phased array wave beam, the operation is continued; otherwise, jumping to O.
M, the satellite-borne network controls and releases phased array wave beams of the satellite terminal, and informs an access routing service of the satellite to update the wave beams and ports of the satellite terminal to be 'none'; the access routing service updates the whole network routing mapping information of the service, and simultaneously diffuses the updating notice of the routing mapping information to other access routing services in the system; other access routing services in the system update the whole network routing mapping information of the service and broadcast the information to the satellite terminals under the jurisdiction of the satellite.
And N, switching the satellite terminal to the global beam.
And O, the satellite terminal is switched into a standby state.
In step B, the route mapping information mainly includes user route information of the satellite terminal, the MAC address, the satellite, the port, and the like.
In step B, step K and step M, each access routing service realizes the diffusion of routing mapping information based on the broadcast forwarding table generated in step A.
In summary, when the satellite terminal applies for accessing the satellite network, the link layer dynamically selects the access beam and the port, and triggers the network layer to execute the registration and the whole network diffusion of the user route, so as to reduce the interaction times and the bandwidth overhead of the networking protocol, and realize the quick convergence of the route and the quick access of the terminal. The method can be used in a multi-satellite networking application scene with on-satellite processing, can reduce the network access time and the route convergence time of a multi-satellite networking system, and improves the random access network capability.
Those of ordinary skill in the art will understand that: the multi-satellite networking method for realizing the joint control of the link layer and the network layer can be realized by hardware or software related to program instructions, and when the program is executed, the steps comprising the method embodiment are executed.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that modifications may be made to the above embodiments, or equivalent substitutions and modifications may be made to other features of the embodiments, and any modifications, equivalents, improvements, etc. within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (3)
1. A multi-satellite networking method for link layer and network layer joint control is realized by joint control of satellite-borne network control of a link layer and access routing service and backbone routing service of the network layer, and is characterized by comprising the following steps:
A. the method comprises the following steps that satellites and ground gateway stations of a multi-satellite system form a space-based backbone network through inter-satellite links and feeder links, backbone routing protocols are interacted between backbone routing services of adjacent satellites and ground gateway stations, a unicast forwarding table and a broadcast forwarding table of inter-satellite paths are generated and are configured to switching equipment of each satellite or ground gateway station;
B. setting at least one access routing service in a multi-satellite system, wherein each access routing service is responsible for managing routing mapping information of one or more satellites, and the routing mapping information of the service is mutually diffused among the access routing services to complete the learning of the routing mapping information of the whole network and periodically broadcast the routing mapping information to satellite terminals of satellites under the jurisdiction of the service;
C. the satellite network operation and maintenance system configures access route service addresses of all the satellites and broadcasts the access route service addresses to the satellite terminals under the satellites of all the satellites through satellite-to-ground announcement;
D. the satellite terminal is started, one network-accessing satellite is selected from a multi-satellite system, and the synchronous acquisition of global signaling beams of the network-accessing satellite is executed; then, the satellite terminal receives the satellite-ground announcement to obtain an access routing service address of the network-accessing satellite;
E. the satellite terminal sends a random access application to a satellite-borne network control of the network-accessing satellite through a signaling wave beam; after receiving the application, the satellite-borne network control selects a temporary wave beam and a port for network access for the satellite terminal and allocates a terminal special control channel under the temporary wave beam; the information of the temporary wave beam, the port and the special control channel of the terminal is informed to the satellite terminal through the network access allowing signaling;
F. the satellite terminal performs synchronous acquisition on the temporary wave beam; then, sending a network access authentication application to the satellite-borne network control through a terminal dedicated control channel; the satellite-borne network control organizes the authentication and key agreement process of the satellite terminal; after all the processes are finished, a successful network access authentication signaling is sent to the satellite terminal; if a VLAN virtual subnet or a working beam is configured for the satellite terminal, the related working parameters are carried in a successful network access authentication signaling and are issued to the satellite terminal;
G. the satellite terminal checks whether a working beam is configured, if the working beam exists, the satellite terminal tries to execute synchronous acquisition of the working beam, and if the synchronous acquisition is successful, the satellite terminal continues to execute the synchronous acquisition of the working beam; otherwise, jumping to the step I;
H. the satellite terminal sends a position updating application to the satellite-borne network control through a terminal special control channel of the temporary wave beam to request to switch to the working wave beam; the satellite-borne network control reserves a special control channel for the satellite terminal under the working beam and responds to accept signaling by position updating; then, the satellite terminal is switched to a working beam, and a position updating confirmation signaling is sent to the satellite-borne network control through a reserved special control channel; after receiving the position updating confirmation signaling, the satellite-borne network control releases the temporary wave beam and the special control channel resource thereof;
I. the satellite terminal carries the information of the current satellite, the wave beam, the port and the virtual subnet in the network access notification and sends the information to the access routing agent of the terminal, and the access routing agent generates the routing mapping information of the terminal;
J. the satellite terminal applies for sending resources through a special control channel of a current beam; the satellite-borne network control allocates a service channel under the current beam; the satellite terminal sends the route mapping information of the terminal to the access route service of the network-accessing satellite through a service channel, and executes route registration;
K. the access routing service of the network-accessing satellite updates the whole network routing mapping information of the service, sends routing registration response to the satellite terminal and simultaneously diffuses the update notification of the routing mapping information to other access routing services in the system; other access routing services in the system update the whole network routing mapping information of the service and broadcast the information to the satellite terminals under jurisdiction of the satellite;
l, the satellite terminal receives broadcast information mapped by the whole network route, and sends a resource release application to the satellite-borne network control after confirming that the route registration is successful; the satellite-borne network control releases the service channel and checks whether the current wave beam of the terminal is a temporary wave beam, if so, the operation is continued; otherwise, jumping to the step O;
m, the satellite-borne network controls to release the temporary wave beam of the satellite terminal and informs the access routing service of the satellite to update the wave beam and the port of the satellite terminal to 'none'; the access routing service updates the whole network routing mapping information of the service, and simultaneously diffuses the updating notice of the routing mapping information to other access routing services in the system; other access routing services in the system update the whole network routing mapping information of the service and broadcast the information to the satellite terminals under jurisdiction of the satellite;
n, the satellite terminal is switched to a signaling beam;
and O, the satellite terminal is switched into a standby state.
2. The method as claimed in claim 1, wherein in step B, the route mapping information includes user route information of the satellite terminal, MAC address, satellite, port information.
3. The method for multi-satellite networking jointly controlled by link layer and network layer as claimed in claim 1, wherein in step B, step K and step M, each access routing service implements routing mapping information diffusion based on the broadcast forwarding table generated in step a.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115314102A (en) * | 2022-09-29 | 2022-11-08 | 中国电子科技集团公司第五十四研究所 | Mobile switching management method suitable for multi-satellite networking |
| CN115314102B (en) * | 2022-09-29 | 2022-12-27 | 中国电子科技集团公司第五十四研究所 | Mobile switching management method suitable for multi-satellite networking |
| CN115474253A (en) * | 2022-11-07 | 2022-12-13 | 中国电子科技集团公司第五十四研究所 | Satellite network user cross-satellite cross-beam seamless mobile switching method |
| CN115474253B (en) * | 2022-11-07 | 2023-02-07 | 中国电子科技集团公司第五十四研究所 | Satellite network user cross-satellite cross-beam seamless mobile switching method |
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