CN113472652A - Topological information synchronization method of low-earth-orbit satellite network and related equipment - Google Patents
Topological information synchronization method of low-earth-orbit satellite network and related equipment Download PDFInfo
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- CN113472652A CN113472652A CN202110536195.1A CN202110536195A CN113472652A CN 113472652 A CN113472652 A CN 113472652A CN 202110536195 A CN202110536195 A CN 202110536195A CN 113472652 A CN113472652 A CN 113472652A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/32—Flooding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18558—Arrangements for managing communications, i.e. for setting up, maintaining or releasing a call between stations
- H04B7/1856—Arrangements for managing communications, i.e. for setting up, maintaining or releasing a call between stations for call routing
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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
- H04B7/18584—Arrangements for data networking, i.e. for data packet routing, for congestion control
Abstract
The present disclosure provides a topology information synchronization method of a low earth orbit satellite network and a related device, wherein the method comprises the following steps: the receiving node determines the link state information of the latest version of the corresponding link according to the link state information flooded by other nodes; the receiving node determines a flooding mode according to the link state information source of the latest version; and the receiving node forwards the link state information of the latest version according to the flooding mode. According to the embodiment of the invention, by improving a flooding mechanism, a large amount of transmission of topology information in a network is avoided, meanwhile, the calculation burden of a satellite during topology synchronization is reduced, and the efficiency of topology information synchronization is further improved.
Description
Technical Field
The present disclosure relates to the field of satellite communications technologies, and in particular, to a topology information synchronization method and related devices for a low earth orbit satellite network.
Background
According to the difference of the orbit heights, the satellite network can be divided into a low orbit satellite network, a medium orbit satellite network and a high orbit satellite network, wherein the low orbit satellite network has the advantages of short transmission delay and small path loss, so that the low orbit satellite network is widely applied to the field of satellite communication. According to whether the network topology changes or not, the satellite network routing algorithm can be divided into a static routing protocol and a dynamic routing protocol, wherein the dynamic routing protocol is more in line with the high dynamics of the satellite network.
The traditional flooding mechanism used by the dynamic routing protocol requires that when a node detects a link state change, the node forwards the information to all nodes in the network; in a large-scale and high-dynamic satellite network, the same link state information is largely repeated in the network, so that the processing and calculation difficulty on the satellite is increased, and the synchronization speed of the topology information becomes slower along with the enlargement of the network scale. In addition, the synchronization speed of the topology information is slow, so that a huge time difference is generated between the topology information grasped by the nodes and the real-time topology information of the network, and a fault link is very easy to be calculated into a transmission path when service routing calculation is carried out, and finally, service interruption or blocking is caused, so that the service performance of the satellite network is greatly influenced, and the requirements of transmission quality, time delay and the like of various services are difficult to meet.
Disclosure of Invention
In view of the above, an object of the present disclosure is to provide a method and related device for synchronizing topology information of a low earth orbit satellite network.
Based on the above purpose, the present disclosure provides a topology information synchronization method for a low earth orbit satellite network, including:
the receiving node determines the link state information of the latest version of the corresponding link according to the link state information flooded by other nodes;
the receiving node determines a flooding mode according to the link state information source of the latest version;
and the receiving node forwards the link state information of the latest version according to the flooding mode.
Further, the determining, by the receiving node, the link state information of the latest version of the corresponding link according to the link state information flooded by other nodes includes:
in response to determining that the received version of link state information is higher than the version of link state information local to the corresponding link, the receiving node updates the link state information local to the corresponding link.
Further, the determining, by the receiving node, a flooding manner according to the source of the link state information of the latest version includes:
the receiving node analyzes the source node ID of the link state information of the latest version and judges the source of the link state information of the latest version according to the routing snapshot;
in response to determining that the latest version of link state information is from an adjacent track, the receiving node determining that the flooding pattern is a first flooding pattern;
in response to determining that the latest version of link state information is from the same track, the receiving node determines that the flooding pattern is a second flooding pattern.
Further, the first flooding manner includes: the receiving node forwards the link state information of the latest version to nodes of the same track and adjacent tracks;
the second flooding manner comprises the following steps: and the receiving node forwards the link state information of the latest version to the nodes on the same track.
Based on the same inventive concept, the present disclosure also provides a topology information synchronization apparatus for a low earth orbit satellite network, comprising:
a first determination module: the receiving node is configured to determine the link state information of the latest version of the corresponding link according to the link state information flooded by other nodes;
a second determination module: configured to determine a flooding pattern for the receiving node based on the source of the latest version of link state information;
a node forwarding module: configured to forward the latest version of the link state information by the receiving node according to the flooding manner.
Based on the same inventive concept, the present disclosure also provides an electronic device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor implements the method according to any one of the above aspects when executing the program.
Based on the same inventive concept, the present disclosure also provides a non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the method as described in any one of the above.
As can be seen from the foregoing, the topology information synchronization method and related device for a low earth orbit satellite network provided by the present disclosure improve a flooding mechanism of a dynamic routing protocol, and select different flooding manners according to a source of link state information; in addition, the topological characteristics of a low-orbit satellite constellation are combined, the link state information is flooded to any node on each orbit, a large amount of transmission of the topological information in a network is avoided, the frequency of receiving the same piece of topological information by the node is reduced, the calculation burden of the satellite during topological synchronization is greatly reduced, and the efficiency of the topological information synchronization is improved.
Drawings
In order to more clearly illustrate the technical solutions in the present disclosure or related technologies, the drawings needed to be used in the description of the embodiments or related technologies are briefly introduced below, and it is obvious that the drawings in the following description are only embodiments of the present disclosure, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of a topology information synchronization method for a low earth orbit satellite network according to an embodiment of the disclosure;
FIG. 2 is a schematic diagram of a low earth orbit satellite topology according to an embodiment of the disclosure;
fig. 3 is a schematic diagram of node a flooding in accordance with an embodiment of the present disclosure;
fig. 4 is a schematic diagram of a node B flooding scheme according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of a flooding manner of a node F according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a topology information synchronization path according to an embodiment of the disclosure;
fig. 7 is a schematic structural diagram of a topology information synchronization apparatus of a low earth orbit satellite network according to an embodiment of the disclosure;
fig. 8 is a schematic structural diagram of an electronic device according to an embodiment of the disclosure.
Detailed Description
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
It is to be noted that technical terms or scientific terms used in the embodiments of the present disclosure should have a general meaning as understood by those having ordinary skill in the art to which the present disclosure belongs, unless otherwise defined. The use of "first," "second," and similar terms in the embodiments of the disclosure is not intended to indicate any order, quantity, or importance, but rather to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items.
As described in the background section, in the related art, a dynamic routing protocol is generally selected to satisfy the high dynamic performance of the satellite network by using a technical scheme of synchronizing topology information through a satellite network routing algorithm. The flooding mechanism of the dynamic routing protocol enables the nodes to forward the link state information to all nodes in the network when the nodes receive the information.
The applicant finds that the low earth orbit satellite network topological structure rule can be generally abstracted to a mesh structure in the process of realizing the disclosure, and certain phase difference exists between orbits; however, while the topological structure is kept relatively stable, the problem of inter-satellite link interruption caused by difficult inter-satellite communication due to the invariance force factors can occur due to the complexity of the space. In addition, with the expansion of the scale of the low-earth orbit satellite network, the link interruption can cause the generation of a large amount of link state information, and when the synchronization speed of the topology information is too low, the service interruption is easily caused by a failed route, and finally the service performance of the satellite network is reduced.
In view of the above, the present disclosure provides a method for synchronizing topology information of a low earth orbit satellite network, which improves a flooding mechanism of a dynamic routing protocol, selects different flooding manners according to a source of link state information, is more suitable for a large-scale low earth orbit satellite network, and can effectively reduce transmission times of topology information in network transmission, thereby reducing waste of low earth orbit satellite network resources and significantly improving a synchronization speed of the topology information.
Hereinafter, the technical means of the present disclosure will be described in detail by specific examples.
Referring to fig. 1, a topology information synchronization method for a low earth orbit satellite network according to an embodiment of the present disclosure includes the following steps:
step S101: and the receiving node determines the link state information of the latest version of the corresponding link according to the link state information flooded by other nodes.
In this step, the link state information flooded by other nodes is obtained in the following manner:
each node monitors the state of an adjacent link through a periodic handshake mechanism;
and responding to the determination that the adjacent link state changes, and sending the current link state information of the corresponding link to all ports by the node monitoring the adjacent link state change.
Further, the determining, by the receiving node, the link state information of the latest version of the corresponding link specifically includes:
in response to determining that the received version of link state information is higher than the version of link state information local to the corresponding link, the receiving node updates the link state information local to the corresponding link.
Specifically, for example, the receiving node receives the link state information of the version V1 sent by another node, the version of the link state information of the corresponding link stored in the local node is V2, and the receiving node determines the link state information of the two versions. When the link state information of which the version is V1 is the latest version, updating the local link state information version to V1; when the link state information of the version V2 is the latest version, no processing is performed on the local link state information.
Step S102: and the receiving node determines a flooding mode according to the link state information source of the latest version.
In this step, the receiving node parses the source node ID of the link state information of the latest version, and determines the source of the link state information of the latest version according to the route snapshot.
In response to determining that the latest version of link state information is from an adjacent track, the receiving node determines that the flooding pattern is a first flooding pattern.
In response to determining that the latest version of link state information is from the same track, the receiving node determines that the flooding pattern is a second flooding pattern.
Correspondingly, the first flooding manner is that the receiving node forwards the link state information of the latest version to nodes of the same track and adjacent tracks. And the second flooding mode is that the receiving node forwards the link state information of the latest version to the nodes on the same track.
Step S103: and the receiving node forwards the link state information of the latest version according to the flooding mode.
Next, a specific application scenario of the topology information synchronization method for the low-earth orbit satellite network according to the embodiment is given.
Referring to fig. 2 and 3, node a monitors the state of the adjacent link through a periodic handshake mechanism, and at a certain time, monitors that the link connected to node H is disconnected, and at this time, node a starts to flood the link state information at this time.
Further, the node B receives the link state information from the node a, compares the version of the link state information with the local link state information version of the corresponding link, obtains that the link state information from the node a is the latest version, and updates the version of the local link state information.
Further, with reference to fig. 4 and 5, the node B analyzes the source node ID of the link state information of the latest version, and determines that the source node a is a node of an adjacent track according to the route snapshot, that is, the link state information is from the adjacent track. Thus, node B determines that the flooding pattern is the first flooding pattern and forwards the latest version of the link state information to node C, D, E. It is easy to understand that when the node F is a receiving node, the latest version of the link state information can be obtained from the node in the same track, and when the flooding manner is determined to be the second flooding manner by the node F, the latest version of the link state information is forwarded to the node G in the same track by the node F.
Finally, referring to fig. 6, the receiving node forwards the latest version of the link state information to the nodes in the same track and the adjacent tracks according to the first flooding manner, i.e., the latest version of the link state information is forwarded by the node B to the node C, D, E. And the node F forwards the link state information of the latest version to the nodes on the same track according to the second flooding mode, namely the node F forwards the link state information of the latest version to the node G.
It can be seen that, in this embodiment, by combining with the topological structure characteristics of the low-earth orbit satellite network, when the link state changes, the receiving node selects a corresponding flooding manner to forward according to the source of the received link state information of the latest version, so as to avoid a large amount of transmission of the topological information in the low-earth orbit satellite network, reduce the number of times that the same piece of topological information is received by the node, greatly reduce the computational burden of the satellite during topological synchronization, and simultaneously, the whole constellation can flood at the fastest speed, thereby improving the efficiency of the topological information synchronization.
It should be noted that the method of the embodiments of the present disclosure may be executed by a single device, such as a computer or a server. The method of the embodiment can also be applied to a distributed scene and completed by the mutual cooperation of a plurality of devices. In such a distributed scenario, one of the devices may only perform one or more steps of the method of the embodiments of the present disclosure, and the devices may interact with each other to complete the method.
It should be noted that the above describes some embodiments of the disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments described above and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
Based on the same inventive concept, corresponding to the method of any embodiment, the disclosure also provides a topology information synchronization device of the low-orbit satellite network.
Referring to fig. 7, the topology information synchronization apparatus of the low earth orbit satellite network includes:
a first determination module: configured to determine, by the receiving node, the latest version of the link state information of the corresponding link based on the link state information flooded by the other nodes.
A second determination module: configured to determine a flooding pattern for the receiving node based on the latest version of the link state information source.
A node forwarding module: configured to forward the latest version of the link state information by the receiving node according to the flooding manner.
For convenience of description, the above devices are described as being divided into various modules by functions, and are described separately. Of course, the functionality of the various modules may be implemented in the same one or more software and/or hardware implementations of the present disclosure.
The apparatus of the foregoing embodiment is used to implement the topology information synchronization method of the corresponding low-earth orbit satellite network in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiment, which are not described herein again.
Based on the same inventive concept, corresponding to the method of any embodiment described above, the present disclosure further provides an electronic device, including a memory, a processor, and a computer program stored in the memory and running on the processor, where when the processor executes the program, the method for synchronizing topology information of a low-earth orbit satellite network according to any embodiment described above is implemented.
Fig. 8 is a schematic diagram illustrating a more specific hardware structure of an electronic device according to this embodiment, where the electronic device may include: a processor 1010, a memory 1020, an input/output interface 1030, a communication interface 1040, and a bus 1050. Wherein the processor 1010, memory 1020, input/output interface 1030, and communication interface 1040 are communicatively coupled to each other within the device via bus 1050.
The processor 1010 may be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits, and is configured to execute related programs to implement the technical solutions provided in the embodiments of the present disclosure.
The Memory 1020 may be implemented in the form of a ROM (Read Only Memory), a RAM (Random Access Memory), a static storage device, a dynamic storage device, or the like. The memory 1020 may store an operating system and other application programs, and when the technical solution provided by the embodiments of the present specification is implemented by software or firmware, the relevant program codes are stored in the memory 1020 and called to be executed by the processor 1010.
The input/output interface 1030 is used for connecting an input/output module to input and output information. The i/o module may be configured as a component in a device (not shown) or may be external to the device to provide a corresponding function. The input devices may include a keyboard, a mouse, a touch screen, a microphone, various sensors, etc., and the output devices may include a display, a speaker, a vibrator, an indicator light, etc.
The communication interface 1040 is used for connecting a communication module (not shown in the drawings) to implement communication interaction between the present apparatus and other apparatuses. The communication module can realize communication in a wired mode (such as USB, network cable and the like) and also can realize communication in a wireless mode (such as mobile network, WIFI, Bluetooth and the like).
It should be noted that although the above-mentioned device only shows the processor 1010, the memory 1020, the input/output interface 1030, the communication interface 1040 and the bus 1050, in a specific implementation, the device may also include other components necessary for normal operation. In addition, those skilled in the art will appreciate that the above-described apparatus may also include only those components necessary to implement the embodiments of the present description, and not necessarily all of the components shown in the figures.
The electronic device of the foregoing embodiment is used to implement the topology information synchronization method of the corresponding low-earth orbit satellite network in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiment, which are not described herein again.
Based on the same inventive concept, corresponding to any of the above-described embodiment methods, the present disclosure also provides a non-transitory computer-readable storage medium storing computer instructions for causing the computer to execute the topology information synchronization method of the low-earth orbit satellite network according to any of the above embodiments.
Computer-readable media of the present embodiments, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device.
The computer instructions stored in the storage medium of the above embodiment are used to enable the computer to execute the topology information synchronization method for a low-earth orbit satellite network according to any of the above embodiments, and have the beneficial effects of corresponding method embodiments, which are not described herein again.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the present disclosure, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present disclosure as described above, which are not provided in detail for the sake of brevity.
In addition, well-known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown in the provided figures for simplicity of illustration and discussion, and so as not to obscure the embodiments of the disclosure. Furthermore, devices may be shown in block diagram form in order to avoid obscuring embodiments of the present disclosure, and this also takes into account the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the embodiments of the present disclosure are to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the disclosure, it should be apparent to one skilled in the art that the embodiments of the disclosure can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.
While the present disclosure has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic ram (dram)) may use the discussed embodiments.
The disclosed embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalents, improvements, and the like that may be made within the spirit and principles of the embodiments of the disclosure are intended to be included within the scope of the disclosure.
Claims (7)
1. A topology information synchronization method of a low earth orbit satellite network comprises the following steps:
the receiving node determines the link state information of the latest version of the corresponding link according to the link state information flooded by other nodes;
the receiving node determines a flooding mode according to the link state information source of the latest version;
and the receiving node forwards the link state information of the latest version according to the flooding mode.
2. The method of claim 1, wherein the receiving node determining a latest version of link state information for a corresponding link from link state information flooded by other nodes comprises:
in response to determining that the received version of link state information is higher than the version of link state information local to the corresponding link, the receiving node updates the link state information local to the corresponding link.
3. The method of claim 1, wherein the receiving node determining a flooding pattern based on the latest version of the source of link state information comprises:
the receiving node analyzes the source node ID of the link state information of the latest version and judges the source of the link state information of the latest version according to the routing snapshot;
in response to determining that the latest version of link state information is from an adjacent track, the receiving node determining that the flooding pattern is a first flooding pattern;
in response to determining that the latest version of link state information is from the same track, the receiving node determines that the flooding pattern is a second flooding pattern.
4. The method of claim 3, wherein the first flooding pattern comprises: the receiving node forwards the link state information of the latest version to nodes of the same track and adjacent tracks;
the second flooding manner comprises the following steps: and the receiving node forwards the link state information of the latest version to the nodes on the same track.
5. A topology information synchronization apparatus of a low earth orbit satellite network, comprising:
a first determination module: the receiving node is configured to determine the link state information of the latest version of the corresponding link according to the link state information flooded by other nodes;
a second determination module: configured to determine a flooding pattern for the receiving node based on the source of the latest version of link state information;
a node forwarding module: configured to forward the latest version of the link state information by the receiving node according to the flooding manner.
6. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method of any one of claims 1 to 4 when executing the program.
7. A non-transitory computer readable storage medium storing computer instructions for causing a computer to perform the method of any one of claims 1 to 4.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110536195.1A CN113472652A (en) | 2021-05-17 | 2021-05-17 | Topological information synchronization method of low-earth-orbit satellite network and related equipment |
| AU2021103351A AU2021103351A4 (en) | 2021-05-17 | 2021-06-15 | Method and device for synchronizing topological information of low-orbit satellite network |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110536195.1A CN113472652A (en) | 2021-05-17 | 2021-05-17 | Topological information synchronization method of low-earth-orbit satellite network and related equipment |
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| CN113472652A true CN113472652A (en) | 2021-10-01 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107040470A (en) * | 2016-12-26 | 2017-08-11 | 北京邮电大学 | Update method and device based on low-orbit satellite link topology status data |
| CN107634793A (en) * | 2017-09-29 | 2018-01-26 | 北京空间飞行器总体设计部 | A kind of LEO/MEO double layer minipellets low overhead flooding method and satellite node |
-
2021
- 2021-05-17 CN CN202110536195.1A patent/CN113472652A/en active Pending
- 2021-06-15 AU AU2021103351A patent/AU2021103351A4/en not_active Ceased
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107040470A (en) * | 2016-12-26 | 2017-08-11 | 北京邮电大学 | Update method and device based on low-orbit satellite link topology status data |
| CN107634793A (en) * | 2017-09-29 | 2018-01-26 | 北京空间飞行器总体设计部 | A kind of LEO/MEO double layer minipellets low overhead flooding method and satellite node |
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| AU2021103351A4 (en) | 2021-07-29 |
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