CN107509166B - Method and system for multi-link switching synchronous gateway based on ground-to-air communication - Google Patents
Method and system for multi-link switching synchronous gateway based on ground-to-air communication Download PDFInfo
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- CN107509166B CN107509166B CN201710655788.3A CN201710655788A CN107509166B CN 107509166 B CN107509166 B CN 107509166B CN 201710655788 A CN201710655788 A CN 201710655788A CN 107509166 B CN107509166 B CN 107509166B
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- H04W4/02—Services making use of location information
- H04W4/023—Services making use of location information using mutual or relative location information between multiple location based services [LBS] targets or of distance thresholds
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
- H04W28/065—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information using assembly or disassembly of packets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The invention relates to the technical field of communication, in particular to a method and a system for switching a synchronous gateway by multiple links based on ground-air communication, wherein the method comprises the following steps: the airborne communication server switches a communication link with the ground network system; the airborne communication server sends link switching information to the ground network system; changing an empty gateway of the ground network system according to the link switching information analyzed by the ground network system; the invention realizes the synchronization of the airborne network ground gateway and the ground-to-air gateway, and ensures that the two-way communication always uses the same communication link; compared with the prior art, the communication link used by the ground network is approximately synchronously consistent with the communication link of the cabin network, so that the airborne network and the ground network can communicate in two directions.
Description
Technical Field
The invention relates to the field of communication, in particular to a method and a system for multilink intelligent switching of a synchronous gateway based on ground-air communication.
Background
The ground-air communication refers to the two-way communication between the ground and the cabin of the airplane, and with the advancement of technology and the rapid development of communication technology, the ground-air communication no longer isolates people from the world when people are on the airplane. As shown in fig. 2, there are many technologies for supporting ground-air communication, and the technologies can be specifically classified into three categories: terrestrial airport WiFi, ATG communication technologies, and satellite communication technologies. Since each air-ground communication technology has its own limitations, for example: the WiFi coverage of a ground airport is small, the ATG communication technology has to rely on a ground base station and a satellite communication technology to provide small communication bandwidth and expensive technology, and therefore, in order to provide more economical and stable airborne network services, ground-air multi-link switching communication technical methods are introduced by airborne network link research departments. The method uses three different communication links, so that the airplane can switch the links based on the limitation of the ground-air communication technology in different flight states, thereby greatly solving the defect of using a single ground-air communication technology. However, the air-ground communication network with multiple links has the problem that the gateway switching is not synchronous when the links are switched. Aiming at the problems that the airborne communication link and the ground communication link cannot always keep communicating on the same link and the airborne communication link cannot be confirmed to be switched to which communication link after the airborne communication link is switched.
In the prior art, a ground server uses a window system, and a plurality of gateways are added in the high-level TCP/IP setting in network setting; however, due to the IP limitation of the ground-air communication system, only one default air gateway of the ground network system can be set, so that the method does not play a substantial role after the cabin switches the link, and the problem of gateway switching cannot be solved. In the prior art, a router is used at a ground access end of a communication link, and the change of a gateway is carried out on the router; this approach also does not address the gateway handoff problem because the ground server cannot know whether the cabin link has changed and which link has been handed off.
Disclosure of Invention
The invention provides a method and a system for switching a synchronous gateway by multiple links based on ground-to-air communication, aiming at the technical problems, the method and the system are used for synchronizing an airborne link switching gateway and a ground-to-air gateway, so that a communication link used by a ground network is approximately synchronous and consistent with a communication link of an engine room network, and smoothness and stability of communication on two sides are ensured.
The invention relates to a multilink switching synchronous gateway method based on ground-air communication, which comprises the following steps:
the airborne communication server switches a communication link with the ground network system;
the airborne communication server sends link switching information to the ground network system;
and changing the empty gateway of the ground network system according to the link switching information analyzed by the ground network system.
Preferably, the on-board server switches the communication link with the ground communication according to the aircraft GPS information, including:
when the flying height of the airplane is 0 meter, the airborne communication server switches the communication link into a first communication link;
when the flying height of the airplane is greater than 0 m and the longitude and latitude of the airplane are in a specified longitude and latitude interval, the airborne communication server switches the communication link into a second communication link;
and when the longitude and latitude of the airplane flies away from the specified longitude and latitude interval, the airborne communication server switches the communication link to a third communication link.
Further, the encapsulating the link switching information of the onboard communication server into a network transmission protocol frame includes: reading the digital identification of the currently used link, packaging the digital identification into a network transmission protocol frame, and sending the network transmission protocol frame with link switching information.
Preferably, the changing the empty gateway of the ground network system according to the link switching information analyzed by the ground network system includes:
receiving the network transmission protocol frame, analyzing the link switching information of the airborne communication server in the network transmission protocol frame, and storing the link switching information to the local;
reading current ground-to-air gateway information, comparing the current ground-to-air gateway information with link switching information stored locally, and judging whether a current ground-to-air communication link and an airborne communication server use link are the same communication link according to a comparison result; if the communication links are the same, the ground air gateway is not changed;
and if the communication links are different, setting the ground-to-air gateway as the link switching information stored in the local. The invention discloses a system for a multilink switching synchronous gateway based on ground-to-air communication, which comprises an engine room network and a ground network, wherein the airborne network comprises an airborne network system and an airborne network server, the ground network comprises a ground network interface, and the airborne communication server is connected to the ground network interface through a communication link;
the onboard network server includes:
the link switching module is used for switching a communication link with the ground network system;
the link switching information processing module is used for sending link switching information to the ground network system;
the ground network interface comprises:
and the ground-to-air gateway setting module is used for changing the air gateway of the ground network system according to the analyzed link switching information in the network protocol frame.
Preferably, the link switching module is configured to switch the communication link with the ground communication by the onboard server according to the aircraft GPS information, that is:
when the flying height of the airplane is 0 meter, the airborne communication server switches the communication link into a first communication link;
when the flying height of the airplane is greater than 0 m and the longitude and latitude of the airplane are within a specified longitude and latitude interval, the airborne communication server switches the communication link into a second communication link;
and when the longitude and latitude of the airplane flies out of the specified longitude and latitude interval, the airborne communication server switches the communication link into a third communication link.
Preferably, the link switching information processing module includes a link switching information detecting unit and a link switching information encapsulating unit, where the link switching information detecting unit is configured to detect a link switching state of the airborne communication server in real time, and if it is detected that the link switching information detecting state is switched, encapsulate the link switching information of the airborne communication server into a network communication protocol frame.
Further, encapsulating the link switching information of the onboard communication server into a network communication protocol frame includes: reading the digital identification of the currently used link, packaging the digital identification into a network transmission protocol frame, and sending the network transmission protocol frame with link switching information. Preferably, the above-mentioned ground-to-air gateway setting module is configured to analyze the link switching information in the network protocol frame to change the air gateway of the ground network system, and includes:
receiving the network transmission protocol frame, analyzing the link switching information of the airborne communication server in the network transmission protocol frame, and storing the link switching information to the local;
reading current ground-to-air gateway information, comparing the current ground-to-air gateway information with link switching information stored locally, and judging whether a current ground-to-air communication link and an airborne communication server use link are the same communication link according to a comparison result;
if the communication links are the same, the ground-to-air gateway is not changed;
and if the communication links are different, setting the ground-to-air gateway as the link switching information stored in the local.
Compared with the prior art, the invention has the beneficial effects that:
(1) the airborne communication server switches the ground-air communication link through the GPS information of the airborne communication server, and the switching intelligence of the airborne communication link is realized.
(2) The switching link of the onboard communication server can be monitored in real time, and the ground server can synchronously know the condition of the communication link used by the cabin.
(3) After receiving the link switching information, the ground network intelligently compares the link switching information with the local gateway information and automatically switches the gateways, so that the automation of gateway switching is realized.
(4) The ground server automatically switches the gateways, so that the airborne communication link is consistent with the communication link corresponding to the ground-to-air gateway all the time, the synchronization of the two-place gateways is realized, and the stability and smoothness of the two-way communication are ensured.
Drawings
FIG. 1 is a schematic flow chart of a preferred embodiment of a ground-to-air communication-based multilink handover synchronization gateway method according to the present invention;
FIG. 2 is a network topology diagram of the air-ground communication system of the present invention;
FIG. 3 is a flowchart of an embodiment of the link switch detect module detecting a variable value of 0;
FIG. 4 is a flow chart of an embodiment of a link switch information encapsulation transmission module of the present invention;
fig. 5 is a flowchart of an embodiment of a ground-to-air gateway setting module according to the present invention;
fig. 6 is a schematic structural diagram of a ground-to-air communication-based multilink handover synchronization gateway system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly and completely apparent, the technical solutions in the embodiments of the present invention are described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a multilink switching synchronous gateway method based on ground-air communication, which specifically comprises the following steps as shown in figure 1:
and S1, switching the communication link with the ground network system by the airborne communication server.
Preferably, GPS positioning can be used to determine the location information of the aircraft, for example: the flying height of the airplane, the longitude and latitude of the airplane and the like; the communication links used by the onboard network are divided according to the GPS information, for example: when the flying height of the airplane is 0 meter, the airborne communication server switches the communication link into a first communication link; when the flying height of the airplane is greater than 0 m and the longitude and latitude of the airplane are in a specified longitude and latitude interval, the airborne communication server switches the communication link into a second communication link; and when the longitude and latitude of the airplane flies away from the specified longitude and latitude interval, the airborne communication server switches the communication link to a third communication link.
The first communication link, the second communication link and the third communication link can be any one of a WiFi (wireless fidelity) link of a ground airport, an ATG (automatic train control) communication link or a satellite communication link.
And S2, the onboard communication server sends link switching information to the ground network system.
And detecting the link switching state of the airborne communication server in real time, and if the detected link switching information is detected to be switched, packaging the link switching information of the airborne communication server into a network transmission protocol frame.
Preferably, the flow of the link handover detection as shown in fig. 3 includes: creating a detection variable and assigning an initial value (0 or 1 can be used, and the assignment of the embodiment is 0) to the detection variable, monitoring the value of the detection variable in real time, and assigning the value of the detection variable to 1 after the link is switched; when the value is 1, the link switching information is encapsulated and transmitted; after the encapsulation and transmission are completed, the value of the variable is set to 0 (set to 0) to continue monitoring the link for handover information. Obviously, if the initial value of the detected variable is 1, the above similar method can be adopted, and the description is omitted. Preferably, the link handover information encapsulation process as shown in fig. 4 includes: reading the digital identification of the currently used link, packaging the digital identification into a network transmission protocol frame, and sending the network transmission protocol frame with link switching information.
Preferably, in order to facilitate the identification of the communication link used by the onboard communication server, the same and unique numerical identifier is set for the same communication link in the onboard communication server software and the ground-related server software, for example, the numerical identifier of the first communication link shown in fig. 2 may be 0x01 hexadecimal number, the numerical identifier of the second communication link may be 0x02 hexadecimal number, and the numerical identifier of the third communication link may be 0x03 hexadecimal number; reading the digital identifier of the link switching information, packaging the digital identifier of the link switching information, and sending the packaged digital identifier of the link switching information to a ground network through a network transmission protocol, as shown in fig. 4;
preferably, the network transport protocol may be a TCP transport protocol, and the encapsulation process of the protocol includes: when the airborne communication server transmits data by using TCP, the data is sent into a protocol stack, and an application layer, a transport layer, a network layer and a link layer process the data layer by layer (mainly adding some head information and tail information); the data units that TCP threads to IP are called TCP segments; the data unit which is transmitted by the IP as a network interface layer is called an IP datagram; the bit stream transmitted over the ethernet is called a frame.
And S3, changing the empty gateway of the ground network system according to the link switching information analyzed by the ground network system.
Preferably, the process of receiving the network protocol frame, analyzing the link switching information in the network protocol frame, and modifying the air gateway of the ground network system according to the link switching information includes, as shown in fig. 5: the ground server software receives the network transmission protocol frame from the airborne communication server, analyzes the cabin using link digital identification in the network transmission protocol frame and stores the analyzed cabin using link digital identification to the local; reading current ground-to-air gateway information; comparing the current ground-to-air communication link with the link switching information stored in the local area, and judging whether the current ground-to-air communication link and the airborne communication server use link are the same communication link according to the comparison result; if the communication links are the same, the ground air gateway is not changed; and if the communication links are different, setting the ground-to-air gateway as the link switching information stored in the local. As one embodiment, the link switching information of the present invention includes a digital identification of the link.
Preferably, the parsing process includes: after the ground network receives the network transmission protocol frame from the airborne communication server, the data is sent into a protocol stack, and the data is analyzed layer by a link layer, a network layer, a link layer and an application layer (mainly, some head information and tail information are removed).
The multilink intelligent switching synchronous gateway system based on ground-to-air communication provided by the invention, as shown in fig. 6, specifically comprises:
the airborne communication server switches a communication link with the ground network system according to the link switching module; the airborne communication server packages the link switching information into frames and sends the frames to the ground network system; and changing the empty gateway of the ground network system according to the link switching information analyzed by the ground network system.
Preferably, the link switching module determines the flight altitude and the latitude and longitude of the airplane by using the information of the GPS positioning; the communication links used by the onboard network are divided according to the GPS information, for example: when the flying height of the airplane is 0 meter, the airborne communication server switches the communication link into a first link; when the flying height of the airplane is greater than 0 m and the longitude and latitude of the airplane are in a specified longitude and latitude interval, the airborne communication server switches the communication link into a second link; and when the longitude and latitude of the airplane flies away from the specified longitude and latitude interval, the airborne communication server switches the communication link to a third link.
Preferably, the link switching information processing module includes a link switching information detection unit and a link switching information encapsulation unit, where the link switching information detection unit is configured to detect a link switching state of the airborne communication server in real time, and if it is detected that the link switching information detection state is switched, encapsulate the link switching information of the airborne communication server into a network communication protocol frame.
A detection variable can be created in the link switching detection module and is assigned to an initial value (0 or 1 is possible, and the assignment of the embodiment is assumed to be 0), the value of the detection variable is monitored in real time, and the value of the detection variable is assigned to be 1 after the link is switched; when the value is 1, the link switching information is encapsulated and transmitted; after the encapsulation and transmission are completed, the value of the variable is set to 0 (set to 0) to continue monitoring the link for handover information. Obviously, if the initial value of the detected variable is 1, the above similar method can be adopted, and the description is omitted.
Preferably, the encapsulating the link switching information of the onboard communication server into a network communication protocol frame includes: reading the digital identification of the currently used link, packaging the digital identification into a network transmission protocol frame, and sending the network transmission protocol frame with link switching information. Specifically, in the airborne communication server software and the ground related server software, the same communication link is provided with an identical and unique digital identifier, for example: the number of the first communication link shown in fig. 2 may be identified as hexadecimal number 0x01, the number of the second communication link may be identified as hexadecimal number 0x02, the number of the third communication link may be identified as hexadecimal number 0x03, the number identification of the link switching information may be read, the number identification of the link switching information may be encapsulated, and the encapsulated number identification may be transmitted to the ground network via a network transmission protocol, as shown in fig. 4;
preferably, in the link switching information encapsulation transmission module, the network transmission protocol may select a TCP transmission protocol.
In the link switching information receiving and analyzing module, the ground server software receives the network transmission protocol frame from the airborne communication server, analyzes the cabin using the link digital identifier in the network transmission protocol frame and stores the analyzed cabin into the local.
The ground-to-air gateway setting module reads the current ground-to-air gateway information and compares the current ground-to-air gateway information with the link switching information stored locally, and judges whether the current ground-to-air communication link and the airborne communication server use link are the same communication link and the ground-to-air gateway is not changed according to the comparison result; and if the communication links are different, setting the ground-to-air gateway as the link switching information stored in the local. As one embodiment, the link switching information of the present invention includes a digital identification of the link.
In summary, according to the embodiments of the present invention, a scheme for implementing a synchronous gateway in an air-ground communication scenario with multiple links switched is provided, so as to solve the problem that the gateway switching is not synchronous when the links are switched in an air-ground communication network with multiple links, eliminate the influence of the link switching on bidirectional communication, enable the bidirectional communication to always use the same communication link, and ensure the stability and smoothness of communication.
It should be understood that the multilink intelligent switching synchronous gateway method and system based on ground-to-air communication are different implementations of the same concept, and parts which are not described in the embodiment of the device can refer to the description of corresponding parts in the embodiment of the method, and vice versa.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
The above-mentioned embodiments, which further illustrate the objects, technical solutions and advantages of the present invention, should be understood that the above-mentioned embodiments are only preferred embodiments of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The multilink switching synchronous gateway method based on the ground-air communication is characterized in that:
the airborne communication server switches a communication link with the ground network system, namely when the flying height of the airplane is 0 meter, the airborne communication server switches the communication link into a first communication link; when the flying height of the airplane is greater than 0 m and the longitude and latitude of the airplane are in a specified longitude and latitude interval, the airborne communication server switches the communication link into a second communication link; when the longitude and latitude of the airplane flies away from the specified longitude and latitude interval, the airborne communication server switches the communication link to a third communication link;
the airborne communication server sends link switching information to the ground network system;
changing an empty gateway of the ground network system according to the link switching information analyzed by the ground network system;
wherein, the same and unique digital identifier is set for the same communication link in the onboard communication server software and the ground related server software.
2. The ground-to-air communication-based multilink switching synchronization gateway method according to claim 1, wherein the airborne communication server sending the link switching information to the ground network system includes detecting the link switching information and encapsulating the link switching information, that is, detecting the link switching state of the airborne communication server in real time, and encapsulating the link switching information of the airborne communication server into a network transmission protocol frame if the detected link switching information state is switched.
3. The ground-to-air communication based multilink handover synchronization gateway method of claim 2, wherein encapsulating the link handover information of the onboard communication server into a network transport protocol frame comprises: reading the digital identification of the currently used link, packaging the digital identification into a network transmission protocol frame, and sending the network transmission protocol frame with link switching information.
4. The method for multi-link switching synchronization gateway based on ground-to-air communication according to claim 1, wherein the modifying the air gateway of the ground network system according to the link switching information analyzed by the ground network system comprises:
receiving the network transmission protocol frame, analyzing the link switching information of the airborne communication server in the network transmission protocol frame, and storing the link switching information to the local;
reading current ground-to-air gateway information, comparing the current ground-to-air gateway information with link switching information stored locally, and judging whether a current ground-to-air communication link and an airborne communication server use link are the same communication link according to a comparison result;
if the communication links are the same, the ground air gateway is not changed;
and if the communication links are different, setting the ground-to-air gateway as the switched link recorded in the local link switching information.
5. The system for the multilink switching synchronous gateway based on the ground-air communication comprises an airborne network and a ground network, wherein the airborne network comprises an airborne network system and an airborne network server, the ground network comprises a ground network interface, and the airborne communication server is connected to the ground network interface through a communication link, and is characterized in that:
the onboard network server includes:
the link switching module is used for switching a communication link with the ground network system, namely when the flying height of the aircraft is 0 meter, the airborne communication server switches the communication link into a first communication link; when the flying height of the airplane is greater than 0 m and the longitude and latitude of the airplane are in a specified longitude and latitude interval, the airborne communication server switches the communication link into a second communication link; when the longitude and latitude of the airplane flies away from the specified longitude and latitude interval, the airborne communication server switches the communication link to a third communication link;
the link switching information processing module is used for sending link switching information to the ground network system;
the ground network interface comprises:
and the ground-to-air gateway setting module is used for changing the air gateway of the ground network system according to the analyzed link switching information in the network protocol frame.
6. The system of the multi-link switching synchronization gateway based on the ground-to-air communication as claimed in claim 5, wherein the link switching information processing module comprises a link switching information detection unit and a link switching information encapsulation unit, the link switching information detection unit is configured to detect a link switching status of the airborne communication server in real time, and encapsulate the link switching information of the airborne communication server into a network communication protocol frame if the detected link switching information detection status is switched.
7. The system of the ground-to-air communication based multi-link switching synchronization gateway of claim 6, wherein the encapsulating the link switching information of the onboard communication server into a network communication protocol frame comprises: reading the digital identification of the currently used link, packaging the digital identification into a network transmission protocol frame, and sending the network transmission protocol frame with link switching information.
8. The system of claim 5, wherein the terrestrial-to-air gateway setting module is configured to analyze the link switching information in the network protocol frame to modify an air gateway of the terrestrial network system, and the system comprises:
if the communication links are the same, the ground-to-air gateway is not changed;
and if the communication links are different, setting the ground-to-air gateway as the switched link recorded in the local link switching information.
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| CN109672574B (en) * | 2019-01-29 | 2021-04-09 | 四川九洲电器集团有限责任公司 | Multilink self-adaptive switching module for unmanned platform measurement and control communication |
| CN116506927B (en) * | 2020-03-06 | 2024-04-26 | 华为技术有限公司 | Energy saving method and communication device applied to multi-link communication |
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