CN110958048A - Low earth orbit satellite network fault processing method, system, controller and medium - Google Patents
Low earth orbit satellite network fault processing method, system, controller and medium Download PDFInfo
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Abstract
The invention relates to a low orbit satellite network fault processing method, a system, a controller and a medium, wherein the method comprises the steps of connecting low orbit satellites by adopting physical links to establish a physical topological structure of a low orbit satellite network; establishing a logical topology structure of a control channel based on the physical topology structure, wherein the logical topology structure can traverse all low-orbit satellites and has no logical loop; and monitoring whether a port of each low-orbit satellite connected with the upstream low-orbit satellite in the logic topological structure is closed, if so, trying to establish communication connection with the low-orbit satellite adjacent to the low-orbit satellite in each preset direction one by one according to a preset sequence, and finishing fault processing when the connection is successful or the connection is tried in all preset directions. The invention can quickly find and repair the low-orbit satellite network fault, increases the robustness of the whole low-orbit satellite network, improves the service supporting capability and greatly reduces the management and control cost.
Description
Technical Field
The invention relates to the technical field of low-earth-orbit satellite communication, in particular to a low-earth-orbit satellite network fault processing method, a low-earth-orbit satellite network fault processing system, a low-earth-orbit satellite network fault processing controller and a low-earth-orbit satellite network fault processing medium.
Background
The Low Earth Orbit (LEO) Low Earth Orbit network is a space network formed by a plurality of Low Earth Orbit (LEO) Low Earth Orbit satellites, and the height of the Low Earth Orbit satellites is 500KM-1000KM from the ground. Low earth orbit satellites cover an area on earth with radio, and users in the area can access the low earth orbit satellites to achieve various forms of communication. The low-earth-orbit satellite network can provide interconnection services with high bandwidth, low time delay and almost global coverage, and is considered as an important technical solution for the next generation of global mobile networks.
A conventional low-earth satellite network is shown in fig. 1, and generally one low-earth satellite is provided with one ground station, a plurality of low-earth satellites are not directly physically connected in space, each low-earth satellite interacts with the ground station when the low-earth satellite has to pass through the ground station, and the ground station can acquire information of the low-earth satellite or form control over the low-earth satellite, such as an iridium satellite system. The cost is increased rapidly due to the arrangement of a large number of ground stations, and when one low-orbit satellite fails, the ground station corresponding to the low-orbit satellite cannot acquire information, the control flexibility is poor, the failure cannot be found in time, and the failure recovery time is long.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method, a system, a controller and a medium for processing a low earth orbit satellite network fault, which can quickly find and repair the low earth orbit satellite network fault, increase the robustness of the whole low earth orbit satellite network, improve the service support capability, and greatly reduce the management and control cost.
In order to solve the above technical problem, according to an aspect of the present invention, there is provided a method for processing a low earth orbit satellite network fault, including:
connecting low-orbit satellites by adopting physical links to establish a physical topological structure of a low-orbit satellite network, wherein all the low-orbit satellites in the physical topological structure can communicate with one or more ground stations;
establishing a logical topology structure of a control channel based on the physical topology structure, wherein the logical topology structure can traverse all low-orbit satellites and has no logical loop;
and monitoring whether a port of each low-orbit satellite connected with the upstream low-orbit satellite in the logic topological structure is closed, if so, trying to establish communication connection with the low-orbit satellite adjacent to the low-orbit satellite in each preset direction one by one according to a preset sequence, and finishing fault processing when the connection is successful or the connection is tried in all preset directions.
Furthermore, each low earth orbit satellite is provided with a plurality of switching systems and a plurality of transceivers, the low earth orbit satellites are connected through the connecting transceivers, and control information is forwarded through the switching systems and the transceivers through inter-satellite links.
Further, the physical topological structure is a lattice topological structure, and the logical topological structure is a comb-shaped topological structure.
Furthermore, each low orbit satellite comprises four ports, namely a first port, a second port, a third port and a fourth port, wherein the first port is a port connected with an upstream low orbit satellite, the fourth port is a port connected with a lower low orbit satellite,
the method includes the steps of monitoring whether a port of each low-orbit satellite connected with an upstream low-orbit satellite in the logic topological structure is closed, if the port is closed, trying to establish communication connection with the low-orbit satellite adjacent to the low-orbit satellite in each preset direction one by one according to a preset sequence, and ending the method when connection is successful or connection trying in all preset directions is completed, wherein the method includes the following steps:
step S101, periodically detecting the state of the first port, or starting to close the first port to inform monitoring, or monitoring a message from failure of recovery of an upstream low-orbit satellite, if the first port is found to be closed, entering step S102, otherwise, staying at step S101;
step S102, judging whether the second port is connected to the first direction, if not, entering step S103, otherwise, entering step S104;
step S103, connecting to the first direction through the second port in an attempt mode, judging whether the connection is successful or not, if the connection is successful, jumping to step S108, and if not, entering step S105;
step S104, connecting in a second direction through a fourth port is tried, whether the connection is successful or not is judged, if the connection is successful, the step S108 is skipped, otherwise, the connection is marked as a lost state of the group living point, and the step S108 is skipped;
s105, attempting to connect to the second direction through the fourth port, judging whether the connection is successful, if so, jumping to the S108, otherwise, entering the S106;
step S106, detecting whether the third port is closed, if so, judging whether the third port is the last low-orbit satellite, and entering step S107, otherwise, sending recovery failure information to the downstream low-orbit satellite, marking the recovery failure information as a lost state of a group living point, and skipping to step S108;
step S107, judging whether the satellite is a last low-orbit satellite, if so, trying to establish connection to the first low-orbit satellite, returning to the step S101 after the connection is successful, marking the satellite as a single-activity-point lost state and returning to the step S108 if the satellite fails, and marking the satellite as a single-activity-point lost state and returning to the step S108 if the satellite is not the last low-orbit satellite;
and S108, waiting for the state recovery or the upstream recovery information of the first port, if so, sending the recovery information to a downstream low-orbit satellite, resetting and returning to execute the step S101, and otherwise, stopping at the step S108.
According to another aspect of the present invention, there is also provided a system for processing a low earth orbit satellite network fault, including:
the physical topological structure establishing module is configured to connect low-orbit satellites by adopting physical links to establish a physical topological structure of a low-orbit satellite network, and all the low-orbit satellites in the physical topological structure can communicate with one or more ground stations;
a logical topology structure establishing module configured to establish a logical topology structure of a control channel based on the physical topology structure, the logical topology structure being capable of traversing all low-earth orbit satellites and having no logical loop;
and the network fault processing module is configured to monitor whether a port of each low-orbit satellite connected with the upstream low-orbit satellite in the logic topological structure is closed, if so, try to establish communication connection with the low-orbit satellites adjacent to the low-orbit satellite in each preset direction one by one according to a preset sequence, and finish fault processing when the connection is successful or the connection attempt in all preset directions is completed.
Furthermore, each low earth orbit satellite is provided with a plurality of switching systems and a plurality of transceivers, the low earth orbit satellites are connected through the connecting transceivers, and control information is forwarded through the switching systems and the transceivers through inter-satellite links.
Further, the physical topological structure is a lattice topological structure, and the logical topological structure is a comb-shaped topological structure.
Furthermore, each low orbit satellite comprises four ports, namely a first port, a second port, a third port and a fourth port, wherein the first port is a port connected with an upstream low orbit satellite, the fourth port is a port connected with a lower low orbit satellite,
the network fault handling module is specifically configured to perform the following steps:
step S101, periodically detecting the state of the first port, or starting to close the first port to inform monitoring, or monitoring a message from failure of recovery of an upstream low-orbit satellite, if the first port is found to be closed, entering step S102, otherwise, staying at step S101;
step S102, judging whether the second port is connected to the first direction, if not, entering step S103, otherwise, entering step S104;
step S103, connecting to the first direction through the second port in an attempt mode, judging whether the connection is successful or not, if the connection is successful, jumping to step S108, and if not, entering step S105;
step S104, connecting in a second direction through a fourth port is tried, whether the connection is successful or not is judged, if the connection is successful, the step S108 is skipped, otherwise, the connection is marked as a lost state of the group living point, and the step S108 is skipped;
s105, attempting to connect to the second direction through the fourth port, judging whether the connection is successful, if so, jumping to the S108, otherwise, entering the S106;
step S106, detecting whether the third port is closed, if so, judging whether the third port is the last low-orbit satellite, and entering step S107, otherwise, sending recovery failure information to the downstream low-orbit satellite, marking the recovery failure information as a lost state of a group living point, and skipping to step S108;
step S107, judging whether the satellite is a last low-orbit satellite, if so, trying to establish connection to the first low-orbit satellite, returning to the step S101 after the connection is successful, marking the satellite as a single-activity-point lost state and returning to the step S108 if the satellite fails, and marking the satellite as a single-activity-point lost state and returning to the step S108 if the satellite is not the last low-orbit satellite;
and S108, waiting for the state recovery or the upstream recovery information of the first port, if so, sending the recovery information to a downstream low-orbit satellite, resetting and returning to execute the step S101, and otherwise, stopping at the step S108.
According to yet another aspect of the invention, a controller is provided comprising a memory and a processor, the memory storing a computer program enabling the implementation of the steps of the method when the program is executed by the processor.
According to yet another aspect of the invention, a computer-readable storage medium is provided for storing a computer program, which when executed by a computer or processor, performs the steps of the method.
Compared with the prior art, the invention has obvious advantages and beneficial effects. By means of the technical scheme, the low earth orbit satellite network fault processing method, the system, the controller and the medium can achieve considerable technical progress and practicability, have wide industrial utilization value and at least have the following advantages:
according to the invention, complicated information interaction is not required, the low-orbit satellite network fault is rapidly discovered and repaired by adopting the independent operation strategy of each low-orbit satellite node, and the whole network broadcasting is avoided, so that the recovery speed is greatly improved, and the problem of live point loss can be effectively avoided; in addition, the invention increases the robustness of the whole low-orbit satellite network, improves the supporting capability of the service and greatly reduces the management and control cost.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a diagram of a conventional low earth orbit satellite network;
fig. 2 is a schematic diagram of a method for handling a low earth orbit satellite network fault according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a low earth orbit satellite network according to an embodiment of the invention;
fig. 4(a) is a schematic diagram of a physical topology of a low-earth orbit satellite network according to an embodiment of the present invention;
FIG. 4(b) is a schematic diagram of a low-earth orbit satellite network control channel comb topology according to an embodiment of the present invention;
FIG. 5(a) is a schematic diagram of an initial topology provided by an embodiment of the present invention;
fig. 5(b) is a schematic diagram of the topology fault repairing based on fig. 5(a) according to an embodiment of the present invention;
FIG. 6(a) is a schematic diagram of a false activity point loss according to an embodiment of the present invention;
FIG. 6(b) is a schematic diagram of a loss of live points according to an embodiment of the present invention;
FIG. 6(c) is a schematic diagram of preventing false activity point loss according to an embodiment of the present invention;
FIG. 7 is a diagram illustrating the failure recovery preventing false live point loss according to an embodiment of the present invention;
FIG. 8 is a flowchart illustrating a process for handling a failure of each satellite in the low earth orbit satellite network according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a system for handling a low earth orbit satellite network fault according to an embodiment of the present invention.
[ notation ] to show
1: physical topology establishment module 2: logic topological structure building module
3: network fault processing module
Detailed Description
To further illustrate the technical means and effects of the present invention for achieving the predetermined objects, the following detailed description of the embodiments and effects of a method, a system, a controller and a medium for processing a low earth orbit satellite network fault according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.
The embodiment of the invention provides a method for processing a low earth orbit satellite network fault, which comprises the following steps as shown in figure 2:
step S1, connecting the low-orbit satellites by adopting physical links to establish a physical topological structure of the low-orbit satellite network, wherein all the low-orbit satellites in the physical topological structure can communicate with one or more ground stations;
as shown in fig. 3, in the single ground station low-orbit satellite network, the low-orbit satellites are connected by physical links and communicate with the same ground station, and as long as the ground station is ensured to have the low-orbit satellite to pass the top at the moment, the information interaction of the control system of the ground station to all the low-orbit satellites can be ensured, so that the whole network control is realized. The network control of the single ground station low-orbit satellite specifically adopts a soft definition control scheme, namely, a software system and a corresponding protocol are utilized to complete information acquisition, attitude control, system control, network control and the like of each low-orbit satellite in the network. The low-orbit satellite network not only can reduce the cost and the complexity, but also has more flexibility in network operation, fault recovery and the like due to the unified control of the whole network. It should be noted that fig. 3 is only an example, and as a variation of fig. 3, a plurality of ground stations may be included, and each ground station may implement full-network control.
As an example, each of the low earth orbit satellites carries a plurality of switching systems and a plurality of transceivers, the low earth orbit satellites are connected through the connecting transceivers, and control information is forwarded through the switching systems and the transceivers via inter-satellite links. The states of the switching system, the transceiver and the inter-satellite link all affect the forwarding of control information, and whether the control information is successfully forwarded or not determines whether the network can normally operate or not. Therefore, when one or more of the switching system, the transceiver, and the inter-satellite link fails, it will cause the low earth orbit satellite network to fail.
In step S1, the physical topology of the low-earth satellite network established based on fig. 2 is shown in fig. 4(a), and the physical topology is a lattice topology, where each circle represents an LEO low-earth satellite, and the connecting line between two circular dots represents inter-satellite links, in the example of fig. 4(a), the number of low-earth satellites in orbit is strictly consistent, each low-earth satellite includes 4 ports, it should be noted that a port may be regarded as a software entity, and a network protocol stack may be run and mapped onto a physical transceiver (mapping may be one port to one transceiver, or may be multiple ports to one transceiver). It is understood that fig. 4(a) is only an example, and the number of the low-orbit satellites in the orbit is not required to be strictly consistent, and may be abstracted as an incomplete lattice when the number of the low-orbit satellites in the orbit is not strictly consistent.
Step S2, establishing a logical topological structure of a control channel based on the physical topological structure, wherein the logical topological structure can traverse all low-orbit satellites and has no logical loop;
in order to meet the compatibility with the existing ground internet, the control information of the low earth orbit satellite network can be carried by a TCP/IP protocol family, and is required to be simply and effectively transmitted to each LEO in the whole network, which requires that the topology of the control information can not generate a logical loop, namely the whole topology must be ensured to be in a tree shape. Therefore, based on the physical topology of fig. 4(a), a comb topology can be cut out as the logical topology of the control channel, which is called the control topology for short, as shown in fig. 4(b), which is essentially tree-shaped. It should be noted that the logical topology of the control channel is a comb topology, which is only an example, and may also be other topologies as long as the logical topology can traverse all low-earth orbit satellites and there is no logical loop. Therefore, no matter the switching system, the transceiver or the inter-satellite link fails, the control topology can be abstracted to control the disconnection of the vertex or the edge in the topology, and the failure recovery can be converted into reestablishment of a new edge to quickly establish a tree in the graph, so that all LEOs in the whole network can be traversed as far as possible in the control topology, and meanwhile, the topology is ensured to be tree-shaped at any time.
In the prior art, the spanning tree protocol STP can be used to construct the tree, but when a network failure occurs, the discovery and recovery of the failure takes tens of seconds due to the periodic and network-wide readjustment requirements, and the time consumption is further increased as the network is scaled up. In the low-orbit satellite network scenario of the embodiment of the present invention, the spatial environment of the network is complex, the probability of equipment and link failure is much higher than that of a ground network, the network is relatively independent, the granularity of the bearer service is richer, the equipment cost and the control method have more limiting factors, and the time delay caused by the STP protocol is intolerable to the control information of the low-orbit satellite network, so that the step S3 can be adopted to repair the network failure.
Step S3, monitoring whether a port of each low-orbit satellite connected to an upstream low-orbit satellite in the logical topology is closed, if so, performing fault recovery by using a fault recovery strategy in a certain direction and consistency, where the fault recovery strategy in the certain direction and consistency is: when the low-orbit satellite monitors that a port connected with an upstream low-orbit satellite is closed, the low-orbit satellite tries to establish communication connection with the low-orbit satellite adjacent to the low-orbit satellite in each preset direction one by one according to a preset sequence, when the connection is successful or the connection is tried in all the preset directions, fault treatment is finished, fault repair is finished if the connection is successful, when the connection is tried in all the preset directions, if the connection is successful finally, the fault repair is finished, and if the connection is not successful, the low-orbit satellite cannot be reconnected to the low-orbit satellite network temporarily.
The step S3 has real-time performance for network fault recovery, increases the robustness of the whole low-orbit satellite network, improves the service supporting capability, and greatly reduces the management and control cost.
Fig. 5(a) shows an initial control topology, and fig. 5(b) shows a low earth orbit satellite node failure on the initial control topology shown in fig. 5 (a). Whether the low-orbit satellite node failure or the link failure has basically the same influence on a low-orbit satellite in a normal state, the corresponding port is closed. As shown in fig. 5(b), when the low-earth satellite x fails (here, the low-earth satellite fails as a whole), the upper and lower links related thereto fail inevitably, and the two low-earth satellites at the other ends of the two links naturally close the corresponding ports due to the detection of the disconnection of the physical link. Similarly, failure of a link can also lead to the same consequences. Therefore, the detection of the low earth orbit satellite network failure can be completely realized by detecting whether the normally opened port is accidentally closed. When a satellite node or a link fails, the original tree topology is not complete, and the low orbit satellite network failure recovery target is obtained by avoiding the failure point or the link to reconstruct the tree topology.
When a fault occurs, the ground control system loses contact with a plurality of affected low-orbit satellites, so that the low-orbit satellites are required to be independently recovered; under the condition of failure, under the condition that certain affected low-orbit satellites do not know the state and the strategy of each other, a new tree can still be constructed in a coordinated and consistent manner; the strategy of the affected low-earth satellites should also guarantee the effectiveness of the action of reestablishing the connection itself, even if it is not lost. Therefore, in step S3, recovery is completed according to a certain direction and a consistent policy selection method. For example, when the y node in fig. 5(b) fails, y +1 and its downstream nodes are entirely disconnected from the original tree, and in principle, a new tree can be formed as long as one of y +1 and its downstream low-earth satellites can establish a connection to the left or right. To obey a certain direction, let y +1 low earth orbit satellite complete a new connection (y +1 low earth orbit satellite is also a low earth orbit satellite that detects a possible failure of y).
As an example, when x fails, x +1 detects that the failure occurs, and connection to the left and the right is not successful, it indicates that the corresponding low-orbit satellite fails, and then connection is established to the left or the right through the x +2 low-orbit satellite, although the x +2 low-orbit satellite may also fail.
The single direction can reduce the possibility of newly building a connecting ring as much as possible, and can effectively cushion the consistency of strategies. Policy consistency may guarantee that all nodes affected by the failure are connected as far as possible. A loss of live is defined if a low earth orbit satellite affected by a fault (which itself has no fault) does not complete an active connection, causing it to leave the control system of the ground station. The case of the live point loss can be divided into a false live point loss and a true live point loss. A lost false activity point is a control system where the affected low earth orbiting satellites are not successfully connected to the ground station because of an improper recovery strategy, whereas a lost true activity point is a control system where one or several low earth orbiting satellites are always not connected to the ground station regardless of the recovery strategy. The single-live-point loss refers to a control system in which one low-earth orbit satellite cannot communicate with the ground station, the group-live-point loss refers to a control system in which more than one low-earth orbit satellite cannot communicate with the ground station, and the false-true-live-point loss examples are respectively shown in fig. 6(a) and 6 (b). False activity point loss can be overcome, and the improper strategy of fig. 6(a) (e.g., all connections to the left) results in the loss of low earth orbit satellites in the virtual circle to a cluster activity point, but can be avoided if connections are established in the manner of fig. 6 (c).
Fig. 7 shows the partial scenario of fig. 6(a), in which only z +2 is connected to the right to avoid false live point loss. But any node cannot know the global condition, and it cannot know the behavior of itself or what effect it causes. False live point loss is traceable, and z +2 causes the live point loss because there is a failed satellite in either the left or right direction, specifically in this example z left satellite. According to the one-way principle, z first tries to establish a connection to the left or to the right, succeeding to the right. z +1 also has two options, where it will find that there is already a connection to the left (and z), where it can choose to either not establish a connection anymore or to establish a connection to the right. Therefore, only selecting to establish a connection to the right can guarantee avoidance of false activity point loss, and z +2 is the same.
In the example shown in fig. 7, each of the low-orbit satellites includes four ports, namely a first port, a second port, a third port and a fourth port, wherein the first port is a port connected with an upstream low-orbit satellite, the fourth port is a port connected with a low-orbit satellite below, the first port is represented by β port, the second port is represented by α port, the third port is represented by delta port, and the fourth port is represented by gamma port.
As shown in fig. 8, in this example, the first direction is a direction with a small ID number, the second direction is a direction with a large ID number, and the preset sequence is to try the first direction first and try the second direction again, where the step S3 specifically includes the following steps:
step S101, periodically detecting the β port state, or starting to notify and monitor β port closing, or monitoring a message from failure of recovery of an upstream low-orbit satellite, if finding that the β port is closed, entering step S102, otherwise, staying at step S101;
step S102, determining α whether the port is connected in the direction of small ID number (leftward in the figure), if not, going to step S103, otherwise, going to step S104;
step S103, trying to connect in the direction with the small ID number through the port α, judging whether the connection is successful, if so, jumping to step S108, otherwise, entering step S105;
step S104, connecting in the direction (rightward in the figure) with large ID number through a gamma port, judging whether the connection is successful, if so, jumping to step S108, otherwise, marking the connection as a lost state of the cluster living point, and jumping to step S108;
step S105, connecting in the direction of large ID number through a gamma port, judging whether the connection is successful, if so, jumping to step S108, otherwise, entering step S106;
step S106, detecting whether the delta port is closed, if so, judging whether the delta port is the last low-orbit satellite, and entering step S107, otherwise, sending recovery failure information to the downstream low-orbit satellite, marking the recovery failure information as a lost state of a group living point, and skipping to step S108;
step S107, judging whether the satellite is a last low-orbit satellite, if so, trying to establish connection to the first low-orbit satellite, returning to the step S101 after the connection is successful, marking the satellite as a single-activity-point lost state and returning to the step S108 if the satellite fails, and marking the satellite as a single-activity-point lost state and returning to the step S108 if the satellite is not the last low-orbit satellite;
and S108, waiting for the α port state recovery or upstream recovery information, if so, sending the recovery information to the downstream low-orbit satellite, resetting and returning to execute the step S101, otherwise, staying at the step S108.
The method of the embodiment of the invention can realize the quick recovery under the control plane fault of the single ground station soft definition low orbit satellite network, does not need complex information interaction and effectively avoids the problem of the loss of the live point; compared with the traditional STP method, the method has the advantages that the strategy that each satellite node operates independently is adopted, so that the whole network broadcasting is avoided, and the recovery speed is greatly improved.
The embodiment of the invention also provides a low-earth satellite network fault processing system, as shown in fig. 9, which comprises a physical topological structure establishing module 1, a logical topological structure establishing module 2 and a network fault processing module 3, wherein the physical topological structure establishing module 1 is configured to connect low-earth satellites by adopting physical links to establish a physical topological structure of a low-earth satellite network, and all low-earth satellites in the physical topological structure can communicate with one or more ground stations; the logical topology structure establishing module 2 is configured to establish a logical topology structure of a control channel based on the physical topology structure, wherein the logical topology structure can traverse all low-orbit satellites and has no logical loop; the network fault processing module 3 is configured to monitor whether a port of each low-orbit satellite connected to an upstream low-orbit satellite in the logical topology structure is closed, and if the port is closed, fault recovery is performed by using a fault recovery strategy in a certain direction and consistency, where the fault recovery strategy in the certain direction and consistency is as follows: when the low-orbit satellite monitors that a port connected with an upstream low-orbit satellite is closed, the low-orbit satellite tries to establish communication connection with the low-orbit satellite adjacent to the low-orbit satellite in each preset direction one by one according to a preset sequence, when the connection is successful or the connection is tried in all the preset directions, fault repair is finished, if the connection is successful, the fault repair is finished, when the connection is tried in all the preset directions, if the connection is successful finally, the fault repair is finished, and if the connection is not successful, the low-orbit satellite cannot be reconnected to the low-orbit satellite network temporarily.
As shown in fig. 3, in the single ground station low-orbit satellite network, the low-orbit satellites are connected by physical links and communicate with the same ground station, and as long as the ground station is ensured to have the low-orbit satellite to pass the top at the moment, the information interaction of the control system of the ground station to all the low-orbit satellites can be ensured, so that the whole network control is realized. The network control of the single ground station low-orbit satellite specifically adopts a soft definition control scheme, namely, a software system and a corresponding protocol are utilized to complete information acquisition, attitude control, system control, network control and the like of each low-orbit satellite in the network. The low-orbit satellite network not only can reduce the cost and the complexity, but also has more flexibility in network operation, fault recovery and the like due to the unified control of the whole network. It should be noted that fig. 3 is only an example, and as a variation of fig. 3, a plurality of ground stations may be included, and each ground station may implement full-network control.
As an example, each of the low earth orbit satellites carries a plurality of switching systems and a plurality of transceivers, the low earth orbit satellites are connected through the connecting transceivers, and control information is forwarded through the switching systems and the transceivers via inter-satellite links. The states of the switching system, the transceiver and the inter-satellite link all affect the forwarding of control information, and whether the control information is successfully forwarded or not determines whether the network can normally operate or not. Therefore, when one or more of the switching system, the transceiver, and the inter-satellite link fails, it will cause the low earth orbit satellite network to fail.
The physical topology of the low-earth satellite network established based on fig. 2 is shown in fig. 4(a), which is a lattice topology, where each circle represents one LEO low-earth satellite, and the connecting line between two circles represents inter-satellite links, in the example of fig. 4(a), the number of low-earth satellites in orbit is strictly consistent, each low-earth satellite includes 4 ports, it should be noted that the ports may be regarded as a software entity, a network protocol stack may be run, and the ports are mapped onto physical transceivers (mapping may be one port to one transceiver, or may be multiple ports to one transceiver). It is understood that fig. 4(a) is only an example, and the number of the low-orbit satellites in the orbit is not required to be strictly consistent, and may be abstracted as an incomplete lattice when the number of the low-orbit satellites in the orbit is not strictly consistent.
In order to meet the compatibility with the existing ground internet, the control information of the low earth orbit satellite network can be carried by a TCP/IP protocol family, and is required to be simply and effectively transmitted to each LEO in the whole network, which requires that the topology of the control information can not generate a logical loop, namely the whole topology must be ensured to be in a tree shape. Therefore, based on the physical topology of fig. 4(a), a comb topology can be cut out as the logical topology of the control channel, which is called the control topology for short, as shown in fig. 4(b), which is essentially tree-shaped. It should be noted that the logical topology of the control channel is a comb topology, which is only an example, and may also be other topologies as long as the logical topology can traverse all low-earth orbit satellites and there is no logical loop. Therefore, no matter the switching system, the transceiver or the inter-satellite link fails, the control topology can be abstracted to control the disconnection of the vertex or the edge in the topology, and the failure recovery can be converted into reestablishment of a new edge to quickly establish a tree in the graph, so that all LEOs in the whole network can be traversed as far as possible in the control topology, and meanwhile, the topology is ensured to be tree-shaped at any time.
In the prior art, the spanning tree protocol STP can be used to construct the tree, but when a network failure occurs, the discovery and recovery of the failure takes tens of seconds due to the periodic and network-wide readjustment requirements, and the time consumption is further increased as the network is scaled up. In the low-orbit satellite network scenario of the embodiment of the invention, the space environment of the network is complex, the failure probability of equipment and a link is higher than that of a ground network, the network is relatively independent, the granularity of the load-bearing service is richer, the limiting factors such as equipment cost and a control method are more, and the time delay caused by the STP protocol is intolerable to the control information of the low-orbit satellite network, so that the network failure can be repaired by adopting the network failure processing module 3. The network fault processing module 3 has real-time performance in repairing network faults, the robustness of the whole low-orbit satellite network is improved, the service supporting capability is improved, and the management and control cost is greatly reduced.
As an example, each of the low-earth orbit satellites includes four ports, namely a first port, a second port, a third port and a fourth port, wherein the first port is a port connected with an upstream low-earth orbit satellite, and the fourth port is a port connected with a lower low-earth orbit satellite.
As an example, the network failure handling module 3 is specifically configured to perform the following steps:
step S101, periodically detecting the state of the first port, or starting to close the first port to inform monitoring, or monitoring a message from failure of recovery of an upstream low-orbit satellite, if the first port is found to be closed, entering step S102, otherwise, staying at step S101;
step S102, judging whether the second port is connected to the first direction, if not, entering step S103, otherwise, entering step S104;
step S103, connecting to the first direction through the second port in an attempt mode, judging whether the connection is successful or not, if the connection is successful, jumping to step S108, and if not, entering step S105;
step S104, connecting in a second direction through a fourth port is tried, whether the connection is successful or not is judged, if the connection is successful, the step S108 is skipped, otherwise, the connection is marked as a lost state of the group living point, and the step S108 is skipped;
s105, attempting to connect to the second direction through the fourth port, judging whether the connection is successful, if so, jumping to the S108, otherwise, entering the S106;
step S106, detecting whether the third port is closed, if so, judging whether the third port is the last low-orbit satellite, and entering step S107, otherwise, sending recovery failure information to the downstream low-orbit satellite, marking the recovery failure information as a lost state of a group living point, and skipping to step S108;
step S107, judging whether the satellite is a last low-orbit satellite, if so, trying to establish connection to the first low-orbit satellite, returning to the step S101 after the connection is successful, marking the satellite as a single-activity-point lost state and returning to the step S108 if the satellite fails, and marking the satellite as a single-activity-point lost state and returning to the step S108 if the satellite is not the last low-orbit satellite;
and S108, waiting for the state recovery or the upstream recovery information of the first port, if so, sending the recovery information to a downstream low-orbit satellite, resetting and returning to execute the step S101, and otherwise, stopping at the step S108.
The embodiment of the invention also provides a controller, which comprises a memory and a processor, wherein the memory stores a computer program, and the program can realize the steps of the low-earth orbit satellite network fault processing method when being executed by the processor.
Embodiments of the present invention further provide a computer-readable storage medium for storing a computer program, where the computer program is executed by a computer or a processor to implement the steps of the method for processing the low-earth orbit satellite network fault.
The embodiment of the invention does not need complex information interaction, and the low-orbit satellite network fault is quickly discovered and repaired by adopting the independent operation strategy of each low-orbit satellite node, so that the whole network broadcasting is avoided, the recovery speed is greatly improved, and the problem of the loss of live points can be effectively avoided; in addition, the invention increases the robustness of the whole low-orbit satellite network, improves the supporting capability of the service and greatly reduces the management and control cost.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A method for processing low earth orbit satellite network fault is characterized by comprising the following steps:
connecting low-orbit satellites by adopting physical links to establish a physical topological structure of a low-orbit satellite network, wherein all the low-orbit satellites in the physical topological structure can communicate with one or more ground stations;
establishing a logical topology structure of a control channel based on the physical topology structure, wherein the logical topology structure can traverse all low-orbit satellites and has no logical loop;
and monitoring whether a port of each low-orbit satellite connected with the upstream low-orbit satellite in the logic topological structure is closed, if so, trying to establish communication connection with the low-orbit satellite adjacent to the low-orbit satellite in each preset direction one by one according to a preset sequence, and finishing fault processing when the connection is successful or the connection is tried in all preset directions.
2. The method of low earth orbit satellite network failure handling of claim 1,
each low earth orbit satellite is provided with a plurality of switching systems and a plurality of transceivers, the low earth orbit satellites are connected through the connecting transceivers, and the switching systems and the transceivers are used for forwarding inter-satellite links of control information.
3. The method of low earth orbit satellite network failure handling of claim 1,
the physical topological structure is a lattice topological structure, and the logical topological structure is a comb-shaped topological structure.
4. The method of low earth orbit satellite network failure handling of claim 1,
each low-orbit satellite comprises four ports which are respectively a first port, a second port, a third port and a fourth port, wherein the first port is a port connected with an upstream low-orbit satellite, the fourth port is a port connected with a lower low-orbit satellite,
the method includes the steps of monitoring whether a port of each low-orbit satellite connected with an upstream low-orbit satellite in the logic topological structure is closed, if the port is closed, trying to establish communication connection with the low-orbit satellite adjacent to the low-orbit satellite in each preset direction one by one according to a preset sequence, and ending the method when connection is successful or connection trying in all preset directions is completed, wherein the method includes the following steps:
step S101, periodically detecting the state of the first port, or starting to close the first port to inform monitoring, or monitoring a message from failure of recovery of an upstream low-orbit satellite, if the first port is found to be closed, entering step S102, otherwise, staying at step S101;
step S102, judging whether the second port is connected to the first direction, if not, entering step S103, otherwise, entering step S104;
step S103, connecting to the first direction through the second port in an attempt mode, judging whether the connection is successful or not, if the connection is successful, jumping to step S108, and if not, entering step S105;
step S104, connecting in a second direction through a fourth port is tried, whether the connection is successful or not is judged, if the connection is successful, the step S108 is skipped, otherwise, the connection is marked as a lost state of the group living point, and the step S108 is skipped;
s105, attempting to connect to the second direction through the fourth port, judging whether the connection is successful, if so, jumping to the S108, otherwise, entering the S106;
step S106, detecting whether the third port is closed, if so, judging whether the third port is the last low-orbit satellite, and entering step S107, otherwise, sending recovery failure information to the downstream low-orbit satellite, marking the recovery failure information as a lost state of a group living point, and skipping to step S108;
step S107, judging whether the satellite is a last low-orbit satellite, if so, trying to establish connection to the first low-orbit satellite, returning to the step S101 after the connection is successful, marking the satellite as a single-activity-point lost state and returning to the step S108 if the satellite fails, and marking the satellite as a single-activity-point lost state and returning to the step S108 if the satellite is not the last low-orbit satellite;
and S108, waiting for the state recovery or the upstream recovery information of the first port, if so, sending the recovery information to a downstream low-orbit satellite, resetting and returning to execute the step S101, and otherwise, stopping at the step S108.
5. A system for handling a low earth orbit satellite network failure, comprising:
the physical topological structure establishing module is configured to connect low-orbit satellites by adopting physical links to establish a physical topological structure of a low-orbit satellite network, and all the low-orbit satellites in the physical topological structure can communicate with one or more ground stations;
a logical topology structure establishing module configured to establish a logical topology structure of a control channel based on the physical topology structure, the logical topology structure being capable of traversing all low-earth orbit satellites and having no logical loop;
and the network fault processing module is configured to monitor whether a port of each low-orbit satellite connected with the upstream low-orbit satellite in the logic topological structure is closed, if so, try to establish communication connection with the low-orbit satellites adjacent to the low-orbit satellite in each preset direction one by one according to a preset sequence, and finish fault processing when the connection is successful or the connection attempt in all preset directions is completed.
6. The low earth orbit satellite network fault handling system of claim 5,
each low earth orbit satellite is provided with a plurality of switching systems and a plurality of transceivers, the low earth orbit satellites are connected through the connecting transceivers, and the switching systems and the transceivers are used for forwarding inter-satellite links of control information.
7. The low earth orbit satellite network fault handling system of claim 5,
the physical topological structure is a lattice topological structure, and the logical topological structure is a comb-shaped topological structure.
8. The low earth orbit satellite network fault handling system of claim 5,
each low-orbit satellite comprises four ports which are respectively a first port, a second port, a third port and a fourth port, wherein the first port is a port connected with an upstream low-orbit satellite, the fourth port is a port connected with a lower low-orbit satellite,
the network fault handling module is specifically configured to perform the following steps:
step S101, periodically detecting the state of the first port, or starting to close the first port to inform monitoring, or monitoring a message from failure of recovery of an upstream low-orbit satellite, if the first port is found to be closed, entering step S102, otherwise, staying at step S101;
step S102, judging whether the second port is connected to the first direction, if not, entering step S103, otherwise, entering step S104;
step S103, connecting to the first direction through the second port in an attempt mode, judging whether the connection is successful or not, if the connection is successful, jumping to step S108, and if not, entering step S105;
step S104, connecting in a second direction through a fourth port is tried, whether the connection is successful or not is judged, if the connection is successful, the step S108 is skipped, otherwise, the connection is marked as a lost state of the group living point, and the step S108 is skipped;
s105, attempting to connect to the second direction through the fourth port, judging whether the connection is successful, if so, jumping to the S108, otherwise, entering the S106;
step S106, detecting whether the third port is closed, if so, judging whether the third port is the last low-orbit satellite, and entering step S107, otherwise, sending recovery failure information to the downstream low-orbit satellite, marking the recovery failure information as a lost state of a group living point, and skipping to step S108;
step S107, judging whether the satellite is a last low-orbit satellite, if so, trying to establish connection to the first low-orbit satellite, returning to the step S101 after the connection is successful, marking the satellite as a single-activity-point lost state and returning to the step S108 if the satellite fails, and marking the satellite as a single-activity-point lost state and returning to the step S108 if the satellite is not the last low-orbit satellite;
and S108, waiting for the state recovery or the upstream recovery information of the first port, if so, sending the recovery information to a downstream low-orbit satellite, resetting and returning to execute the step S101, and otherwise, stopping at the step S108.
9. A controller comprising a memory and a processor, wherein: the memory stores a computer program enabling to carry out the steps of the method of any one of claims 1 to 4 when executed by the processor.
10. A computer-readable storage medium storing a computer program, characterized in that: the program when executed by a computer or processor implements the steps of the method of any one of claims 1 to 4.
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