CN115396261A - World protocol conversion gateway supporting instant use - Google Patents
World protocol conversion gateway supporting instant use Download PDFInfo
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- CN115396261A CN115396261A CN202210838607.1A CN202210838607A CN115396261A CN 115396261 A CN115396261 A CN 115396261A CN 202210838607 A CN202210838607 A CN 202210838607A CN 115396261 A CN115396261 A CN 115396261A
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- 238000005538 encapsulation Methods 0.000 claims description 7
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/08—Protocols for interworking; Protocol conversion
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Abstract
The invention provides a world protocol conversion gateway supporting connection and use, which can support protocol conversion of a world heterogeneous link and support connection and use of a satellite-to-ground link, and ground does not need manual configuration. A world protocol conversion gateway supporting instant use comprises a protocol conversion processing module and an Ethernet hardware address management module; the protocol conversion processing module is used for completing the conversion between a ground link Ethernet protocol and a satellite-ground link advanced on-orbit system protocol, and comprises a downlink direction and an uplink direction; the Ethernet hardware address management module is used for completing the acquisition of a source hardware address and a destination hardware address required by data transmission on a ground Ethernet link by the world protocol conversion gateway.
Description
Technical Field
The invention relates to the technical field of space network information transmission, in particular to a world protocol conversion gateway supporting instant use.
Background
Space networks generally need to utilize satellite-ground links, and realize measurement, control, operation and data transmission service support for nodes such as satellites in the space networks by means of ground stations. The ground generally interconnects various ground stations for measurement, control, operation and data transmission through a ground network to form a ground station network.
Since the satellite-ground link and the ground link have different characteristics in terms of transmission media, transmission distance, transmission delay and the like, the satellite-ground link and the ground link generally adopt different link layer protocols, for example, the satellite-ground link generally adopts an advanced on-orbit system protocol proposed by the consulting committee of the space data system, and the ground link generally adopts an ethernet protocol. In order to realize the interconnection between the space network and the ground network, a space-ground protocol conversion gateway is needed to realize the protocol conversion of different link layer protocols of the satellite-ground link and the ground link and realize the intercommunication between the space network and the ground network.
In addition, due to the relative motion between the space node and the ground node and the shielding of the earth, the satellite-ground link between the space node and the ground node cannot be continuously maintained, but is dynamically switched, and the space-ground protocol conversion gateway needs to be capable of flexibly adapting to the dynamic switching.
Disclosure of Invention
The invention provides a world protocol conversion gateway supporting connection and use, which can support protocol conversion of a world heterogeneous link and support connection and use of a satellite-to-ground link without manual configuration on the ground.
The invention is realized by the following technical scheme.
A world protocol conversion gateway supporting instant use comprises a protocol conversion processing module and an Ethernet hardware address management module;
the protocol conversion processing module is used for completing the conversion between a ground link Ethernet protocol and a satellite-ground link advanced on-orbit system protocol, and comprises a downlink direction and an uplink direction;
the Ethernet hardware address management module is used for completing the acquisition of a source hardware address and a destination hardware address required by data transmission on a ground Ethernet link by the world protocol conversion gateway.
The invention has the beneficial effects that:
1. the satellite-ground link and the ground link have different characteristics in the aspects of transmission media, transmission distance, transmission delay and the like, so that the satellite-ground link and the ground link generally adopt different link layer protocols;
2. according to the invention, through the protocol conversion processing module and the Ethernet hardware address management module, the link layer protocol conversion of the satellite-ground link and the ground link can be realized, and the integrated networking of a space network and a ground network at a network layer is realized;
3. the invention can realize the instant use of the satellite-ground link by acquiring the source hardware address and the destination hardware address, and supports the automatic configuration under the condition of dynamic switching of the satellite-ground link.
Drawings
FIG. 1 is a schematic diagram of a protocol conversion processing module of the present invention;
fig. 2 is a schematic diagram of an ethernet hardware address management module according to the present invention.
Detailed Description
Exemplary embodiments of the present invention are described in detail below with reference to the accompanying drawings. It is to be understood that the embodiments shown and described in the drawings are merely exemplary and are intended to illustrate the principles and spirit of the invention, not to limit the scope of the invention.
The invention relates to a world protocol conversion gateway supporting instant use, which comprises a protocol conversion processing module and an Ethernet hardware address management module;
as shown in fig. 1, the protocol conversion processing module is configured to complete conversion between a ground link ethernet protocol and a satellite-to-ground link advanced on-orbit system protocol, and includes a downlink direction and an uplink direction;
in the downlink direction, the protocol conversion processing module receives a high-level on-orbit system data frame sent by a satellite through a satellite-to-ground link, extracts an encapsulation packet from the high-level on-orbit system data frame, extracts an internet protocol packet from the encapsulation packet, extracts an IPv6 message from the internet protocol packet, encapsulates the IPv6 message into an Ethernet data frame, fills a destination hardware address and a source hardware address of the Ethernet data frame, and finally sends the Ethernet data frame through a ground link;
in the uplink direction, the protocol conversion processing module receives an Ethernet data frame sent by a ground network through a ground link, extracts an IPv6 message from the Ethernet data frame, encapsulates the IPv6 message into an Internet protocol packet, further encapsulates the Internet protocol packet into an encapsulation packet, and finally encapsulates the encapsulation packet into a high-level on-orbit system data frame and sends the high-level on-orbit system data frame through a satellite-ground link.
As shown in fig. 2, the ethernet hardware address management module is configured to complete acquisition of a source hardware address and a destination hardware address required for data transmission by a space-ground protocol conversion gateway on a ground ethernet link;
in this embodiment, the following method is adopted to obtain the destination hardware address:
firstly, acquiring a source hardware address field of a received Ethernet data frame, recording the source hardware address field as MAC1, and then acquiring a frame type field of the received Ethernet data frame; if the frame type field is equal to 0x86DD, further acquiring the next header field of the IPv6 message; if the next header field is 0x3A, further acquiring a type field of an ICMPv6 message; if the ICMPv6 message type field is 0x87, the MAC1 is used as a destination hardware address when the MAC1 sends an Ethernet data frame; such as the destination MAC in fig. 2.
In this embodiment, the following method is adopted for obtaining the source hardware address:
firstly, acquiring a next head field of an IPv6 message received on a satellite-to-ground link, and further acquiring a type field of the ICMPv6 message if the next head field is 0x 3A; and if the type field of the ICMPv6 message is 0x88, acquiring a target link layer address in the neighbor advertisement message as a source hardware address when the target link layer address sends an Ethernet data frame.
The following describes the specific process of the invention when the world protocol conversion gateway establishes a communication link with a ground station through a satellite-ground link in detail:
when the router initially operates, the ground station router operates a duplicate address detection function and sends a neighbor request message to the heaven-earth protocol conversion gateway, and at the moment, the heaven-earth protocol conversion gateway acquires a destination hardware address for sending an Ethernet data frame by using the neighbor request message received from a ground link;
after an adjacency relation is established between the satellite node and the ground station router through a dynamic routing OSPFv3 protocol, the ground station router sends a neighbor request message to the satellite node through a ground link and a space-ground protocol conversion gateway to request a hardware address of the satellite node;
the heaven-earth protocol conversion gateway acquires the hardware address in the neighbor request message sent by the ground station router again, and updates the target hardware address of the Ethernet data frame sent by the heaven-earth protocol conversion gateway;
after receiving the neighbor request message, the satellite node replies a neighbor advertisement message to the ground station router through the satellite-ground link via the space-ground protocol conversion gateway, and the space-ground protocol conversion gateway extracts the neighbor advertisement message received from the satellite-ground link and extracts a target link layer address from the neighbor advertisement message as a source hardware address for sending an Ethernet data frame by the satellite node.
When a satellite-ground link is switched, namely when another intra-satellite establishes the satellite-ground link with the ground station, the new intra-satellite and the ground station operate the OSPFv3 protocol again, and after the new intra-satellite and the ground station establish the adjacency relation, the ground station router sends a neighbor request message to the satellite node in the new environment through the ground link via the space-ground protocol conversion gateway to request the hardware address of the satellite node in the new environment;
the heaven-earth protocol conversion gateway acquires the hardware address in the neighbor request message sent by the ground station router again, and updates the destination hardware address of the Ethernet data frame sent by the ground station router;
after receiving the neighbor request message, the satellite node in the new border replies a neighbor advertisement message to the ground station router through the satellite-ground link via the protocol conversion gateway;
the heaven-earth protocol conversion gateway extracts the neighbor advertisement message received from the satellite-earth link and extracts a target link layer address from the neighbor advertisement message as a source hardware address for sending the Ethernet data frame by the heaven-earth protocol conversion gateway.
Through the method, the conversion of the space-ground protocol can be realized, and the dynamic switching of the satellite-ground link can be supported.
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art, having the benefit of this disclosure, may effect numerous modifications thereto and changes may be made without departing from the scope of the invention in its aspects.
Claims (5)
1. A world protocol conversion gateway supporting instant use is characterized by comprising a protocol conversion processing module and an Ethernet hardware address management module;
the protocol conversion processing module is used for completing the conversion between a ground link Ethernet protocol and a satellite-ground link advanced on-orbit system protocol, and comprises a downlink direction and an uplink direction;
the Ethernet hardware address management module is used for completing the acquisition of a source hardware address and a destination hardware address required by data transmission on a ground Ethernet link by the world protocol conversion gateway.
2. The gateway of claim 1, wherein in the downlink direction, the protocol conversion processing module receives a high-level on-orbit system data frame sent by a satellite through a satellite-to-ground link, extracts an encapsulation packet from the data frame, extracts an internet protocol packet from the encapsulation packet, extracts an IPv6 packet from the internet protocol packet, encapsulates the IPv6 packet into an ethernet data frame, fills a destination hardware address and a source hardware address of the ethernet data frame, and finally sends the packet out through a ground link.
3. The gateway of claim 1 or 2, wherein in an uplink direction, the protocol conversion processing module receives an ethernet data frame sent by a terrestrial network through a terrestrial link, extracts an IPv6 packet from the ethernet data frame, encapsulates the IPv6 packet into an internet protocol packet, further encapsulates the internet protocol packet into an encapsulation packet, and finally encapsulates the internet protocol packet into an advanced on-track system data frame and sends the advanced on-track system data frame through a satellite-to-ground link.
4. A gateway for supporting tandem-on-demand protocol conversion according to claim 1, 2 or 3, wherein the destination hardware address is obtained by:
firstly, acquiring a source hardware address field of a received Ethernet data frame, recording the source hardware address field as MAC1, and then acquiring a frame type field of the received Ethernet data frame; if the frame type field is equal to 0x86DD, further acquiring a next header field of the IPv6 message; if the next header field is 0x3A, further acquiring a type field of an ICMPv6 message; if the ICMPv6 message type field is 0x87, the MAC1 is used as a destination hardware address when the MAC1 sends an Ethernet data frame; such as the destination MAC in fig. 2.
5. A gateway for supporting tandem-on-demand protocol conversion according to claim 1, 2 or 3, wherein the source hardware address is obtained by:
firstly, acquiring a next head field of an IPv6 message received on a satellite-to-ground link, and further acquiring a type field of the ICMPv6 message if the next head field is 0x 3A; and if the type field of the ICMPv6 message is 0x88, acquiring a target link layer address in the neighbor advertisement message as a source hardware address when the target link layer address sends an Ethernet data frame.
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Cited By (2)
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CN116707616A (en) * | 2023-06-28 | 2023-09-05 | 四川大学 | Space network multi-protocol distributed datagram forwarding method |
CN117081640A (en) * | 2023-07-10 | 2023-11-17 | 武汉船舶通信研究所(中国船舶集团有限公司第七二二研究所) | Multi-protocol star warship-ground integrated gateway design method based on frame header compression |
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