CN107509166B - Method and system for multi-link switching synchronous gateway based on ground-to-air communication - Google Patents

Abstract

The present invention relates to the field of communication technologies, and in particular to a method and system for switching a synchronization gateway based on multi-link communication between ground and air. The method includes: an airborne communication server switches a communication link with a ground network system; an airborne communication server The link switching information is sent to the ground network system; the air-to-air gateway of the ground network system is changed according to the link switching information parsed by the ground network system; the invention realizes the synchronization of the airborne network-to-ground gateway and the ground-to-air gateway, and ensures the The two-way communication always uses the same communication link; compared with the prior art, the present invention makes the communication link used by the ground network almost synchronously consistent with the communication link of the cabin network, so that the airborne network and the ground network can communicate in both directions.

Description

Method and system for multi-link switching synchronization gateway based on ground-air communication

technical field

The invention relates to the field of communication, in particular to a method and system for a multi-link intelligent switching synchronization gateway based on ground-air communication.

Background technique

Ground-air communication refers to the two-way communication between the ground and the aircraft cabin. With the advancement of science and technology and the rapid development of communication technology, ground-air communication makes people's time on the plane no longer "isolated from the world". As shown in Figure 2, at present, there are many technologies supporting ground-air communication, which can be divided into three categories: ground airport WiFi, ATG communication technology and satellite communication technology. Since each ground-to-air communication technology has its own limitations, such as: small ground airport WiFi coverage, ATG communication technology must rely on ground base stations and satellite communication technology to provide small communication bandwidth, and the technology is expensive, so in order to provide more economical , Stabilized airborne network services, the relevant airborne network link research department has launched the ground-space multi-link switching communication technology method. The method uses three different communication links, so that the aircraft can perform link switching based on the limitations of ground-air communication technology in different flight states, thus greatly solving the insufficiency of using a single ground-air communication technology. However, in this multi-link ground-air communication network, the problem of asynchronous switching of gateways occurs when the links are switched. In view of the fact that the airborne communication link and the ground communication link cannot always communicate on the same link, and when the airborne communication link is switched, it is impossible to confirm which communication link the airborne communication link is switched to.

In the prior art, the ground server uses the window system to add multiple gateways in the advanced TCP/IP settings in the network settings; but due to the IP limitation of the ground-air communication system, only one default air-to-air gateway can be set in the ground network system, As a result, this method does not play a substantial role after switching links in the engine room, and cannot solve the problem of gateway switching. In addition, the current technology uses a router at the ground access end of the communication link, and the gateway is changed on the router; since the ground server cannot know whether the cabin link has changed and which link has been switched, this method cannot solve the gateway switching. question.

SUMMARY OF THE INVENTION

In view of the above technical problems, the present invention provides a method and system for a multi-link switching synchronization gateway based on ground-air communication. The synchronization between the airborne link switching gateway and the ground-to-air gateway makes the communication link used by the ground network It is almost synchronous with the communication link of the cabin network, which ensures the smoothness and stability of the communication on both sides.

A multi-link switching synchronization gateway method based on ground-air communication of the present invention includes:

The onboard communication server switches the communication link with the ground network system;

The airborne communication server sends the link switching information to the ground network system;

Change the air-to-air gateway of the ground network system according to the link switching information parsed by the ground network system.

Preferably, the onboard server switches the communication link with the ground communication according to the GPS information of the aircraft, including:

When the flight altitude of the aircraft is 0 meters, the onboard communication server switches the communication link to the first communication link;

When the flight altitude of the aircraft is greater than 0 meters and the longitude and latitude of the aircraft are within the specified longitude and latitude interval, the onboard communication server switches the communication link to the second communication link;

When the longitude and latitude of the aircraft flies away from the specified longitude and latitude interval, the onboard communication server switches the communication link to the third communication link.

Further, the encapsulating the link switching information of the airborne communication server into the network transmission protocol frame includes: reading the digital identifier of the currently used link, encapsulating the digital identifier into the network transmission protocol frame, and sending the digital identifier to the network transmission protocol frame. A network transport protocol frame with link switching information.

Preferably, the modification of the air-to-air gateway of the ground network system according to the link switching information parsed by the ground network system includes:

Receive the network transmission protocol frame, parse out the airborne communication server link switching information in the network transmission protocol frame, and save the link switching information locally;

Read the current ground-to-air gateway information, compare it with the link switching information stored locally, and judge whether the current ground-to-air communication link and the link used by the airborne communication server are the same communication link according to the comparison result If it is the same communication link, the ground-to-air gateway does not change;

If it is a different communication link, set the ground-to-air gateway to save the link switching information locally. A multi-link switching synchronization gateway system based on ground-air communication of the present invention includes a cabin network and a ground network, the on-board network includes an on-board network system and an on-board network server, and the ground network includes a ground network interface , the onboard communication server is connected to the ground network interface with a communication link;

The onboard network server includes:

The link switching module switches the communication link with the ground network system;

The link switching information processing module sends the link switching information to the ground network system;

The ground network interface includes:

The ground-to-air gateway setting module is used to change the air-to-air gateway of the ground network system according to the link switching information in the parsed network protocol frame.

Preferably, the link switching module is used for the onboard server to switch the communication link with the ground communication according to the GPS information of the aircraft, namely:

When the flight altitude of the aircraft is 0 meters, the onboard communication server switches the communication link to the first communication link;

When the flight altitude of the aircraft is greater than 0 meters and the longitude and latitude of the aircraft are within a specified longitude and latitude interval, the onboard communication server switches the communication link to the second communication link;

When the longitude and latitude of the aircraft flies out of the specified longitude and latitude interval, the onboard communication server switches the communication link to the third communication link.

Preferably, the link switching information processing module includes a link switching information detection unit and a link switching information encapsulation unit, the link switching information detection unit is used for real-time detection of the link switching status of the airborne communication server, if a link is detected If the detected state of the switching information is switched, the link switching information of the airborne communication server is encapsulated into a network communication protocol frame.

Further, the encapsulating the link switching information of the airborne communication server into the network communication protocol frame includes: reading the digital identifier of the currently used link, encapsulating the digital identifier into the network transmission protocol frame, and sending the digital identifier to the network transmission protocol frame. A network transport protocol frame with link switching information. Preferably, the ground-to-air gateway setting module used to parse out the link switching information in the network protocol frame and change the air-to-air gateway of the ground network system includes:

Receive the network transmission protocol frame, parse out the airborne communication server link switching information in the network transmission protocol frame, and save the link switching information locally;

Read the current ground-to-air gateway information, compare it with the link switching information stored locally, and judge whether the current ground-to-air communication link and the link used by the airborne communication server are the same communication link according to the comparison result road;

If it is the same communication link, do not change the ground-to-air gateway;

If it is a different communication link, set the ground-to-air gateway to save the link switching information locally.

Compared with the prior art, the beneficial effects of the present invention are:

(1) The airborne communication server switches the ground-air communication link through the local GPS information, and realizes the intelligent switching of the airborne communication link.

(2) The switching link of the airborne communication server can be monitored in real time, and the ground server can synchronously understand the use of the communication link in the cabin.

(3) After receiving the link switching information, the ground network intelligently compares it with the local gateway information and switches the gateway automatically, realizing the automation of the gateway switching.

(4) The ground server automatically switches the gateway, so that the airborne communication link and the communication link corresponding to the ground-to-air gateway are always consistent, realize the synchronization of the two gateways, and ensure the stability and smoothness of the two-way communication.

Description of drawings

1 is a schematic flowchart of a preferred embodiment of a method for a multi-link switching synchronization gateway based on ground-air communication according to the present invention;

Fig. 2 is the network topology diagram of the ground-air communication system of the present invention;

FIG. 3 is a flowchart of an embodiment of the present invention in which the value of the detection variable of the link switching detection module is 0;

4 is a flowchart of an embodiment of a link switching information encapsulation and transmission module according to the present invention;

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 multi-link switching synchronization gateway system based on ground-air communication according to the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and Not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

A multi-link switching synchronization gateway method based on ground-air communication proposed by the present invention, as shown in Figure 1, specifically includes the following steps:

S1. The onboard communication server switches the communication link with the ground network system.

Preferably, GPS positioning can be used to determine the position information of the aircraft, such as the flight altitude of the aircraft, the latitude and longitude of the aircraft, etc.; the communication link used by the airborne network is divided according to the GPS information, for example: when the flight altitude of the aircraft is 0 meters , the airborne communication server switches the communication link to the first communication link; when the flight altitude of the aircraft is greater than 0 meters and the longitude and latitude of the aircraft is in the specified longitude and latitude interval, the airborne communication server switches the communication link to the second communication link; When the longitude and latitude of the aircraft flies away from the specified longitude and latitude interval, the onboard communication server switches the communication link to the third communication link.

The first communication link, the second communication link, and the third communication link of the present invention may be any one of a ground airport WiFi link, an ATG communication link or a satellite communication link.

S2. The airborne communication server sends the link switching information to the ground network system.

The link switching status of the airborne communication server is detected in real time, and if the detected link switching information detection status is switched, the link switching information of the airborne communication server is encapsulated into a network transmission protocol frame.

Preferably, the process of link switching detection is shown in FIG. 3 , including: creating a detection variable and assigning an initial value to the variable (either 0 or 1 is acceptable, assuming that the value of the detection variable is set to 0 in this embodiment), and monitoring the value of the detection variable in real time , when the link is switched, the value of the detection variable is set to 1; when the value is 1, the link switching information is encapsulated and transmitted; after the encapsulation and transmission are completed, the value of this variable is set to 0 (set to 0) to continue monitoring Link handover information. Obviously, if the detection variable is assigned an initial value of 1, a method similar to the above can be used, and details are not repeated here. Preferably, the process of link switching information encapsulation, as shown in FIG. 4 , includes: reading the digital identifier of the currently used link, encapsulating the digital identifier into a network transmission protocol frame, and sending the network with link switching information. Transport protocol frames.

Preferably, in order to facilitate the identification of the communication link used by the airborne communication server, the same and unique digital identifier is set for the same communication link in the airborne communication server software and the ground related server software, for example: It shows that the digital identification of the first communication link is hexadecimal number 0x01, the digital identification of the second communication link is hexadecimal number 0x02, and the digital identification of the third communication link is hexadecimal number 0x03; read Take the digital identifier of the link switching information, encapsulate the digital identifier of the link switching information, and send it to the ground network through the network transmission protocol, as shown in Figure 4;

Preferably, the network transmission protocol can select the TCP transmission protocol, and the encapsulation process of the protocol includes: when the airborne communication server transmits data using TCP, the data is sent into the protocol stack, and the application layer, transport layer, network layer and chain The road layer processes the data layer by layer (mainly adding some header information and tail information); the data unit sent by TCP to IP is called TCP segment; the data unit transmitted by IP to the network interface layer is called IP datagram ; the stream of bits transmitted over Ethernet is called a frame.

S3. Change the air-to-air gateway of the ground network system according to the link switching information parsed by the ground network system.

Preferably, the process of receiving the network protocol frame, parsing out the link switching information in the network protocol frame, and changing the air-to-air gateway of the ground network system according to the link switching information is shown in FIG. The network transmission protocol frame of the server, and parse the engine cabin using the link digital identifier in the network transmission protocol frame, and save it locally; read the current ground-to-air gateway information; compare it with the link switching information stored locally, And according to the comparison result, judge whether the current ground-to-air communication link and the link used by the airborne communication server are the same communication link; if it is the same communication link, the ground-to-air gateway will not change; if it is a different communication link route, set the ground-to-air gateway to save the link switching information locally. As an embodiment, the link switching information of the present invention includes the digital identification of the link.

Preferably, the parsing process includes: when the ground network receives the network transmission protocol frame from the airborne communication server, the data is sent into the protocol stack, and the link layer, the network layer, the link layer and the application layer compare the data layer by layer. Data is parsed (mainly to remove some header information and tail information).

A multi-link intelligent switching synchronization gateway system based on ground-air communication proposed by the present invention, as shown in Figure 6, specifically includes:

The airborne communication server switches the communication link with the ground network system according to the link switching module; the airborne communication server encapsulates the link switching information into frames and sends it to the ground network system; changes the ground network system according to the link switching information parsed by the ground network system The air gateway for the network system.

Preferably, the link switching module uses the GPS positioning information to determine the flight altitude and the latitude and longitude of the aircraft; according to the GPS information, the communication link used by the airborne network is divided, for example: when the flight altitude of the aircraft is 0 meters, the airborne communication server Switch the communication link to the first link; when the flight altitude of the aircraft is greater than 0 meters and the latitude and longitude of the aircraft is within the specified range of latitude and longitude, the onboard communication server switches the communication link to the second link; when the latitude and longitude of the aircraft leaves the When the specified latitude and longitude interval is specified, the onboard communication server switches the communication link to the third link.

Preferably, the link switching information processing module includes a link switching information detection unit and a link switching information encapsulation unit, the link switching information detection unit is used to detect the link switching status of the airborne communication server in real time, if the link is detected If the detected state of the switching information is switched, the link switching information of the airborne communication server is encapsulated into a network communication protocol frame.

A detection variable can be created in the link switching detection module and assigned an initial value (either 0 or 1, assuming the value is 0 in this embodiment), and the value of the detection variable can be monitored in real time. When the link is switched, the detection variable will be detected. The value of the variable is set to 1; when the value is 1, the link switching information is encapsulated and transmitted; after the encapsulation and transmission are completed, the value of this variable is set to 0 (set to 0) to continue monitoring the link switching information. Obviously, if the detection variable is assigned an initial value of 1, a method similar to the above can be used, and details are not repeated here.

Preferably, the encapsulating the link switching information of the airborne communication server into the network communication protocol frame includes: reading the digital identifier of the currently used link, encapsulating the digital identifier into the network transmission protocol frame, and sending the digital identifier to the network transmission protocol frame. A network transport protocol frame with link switching information. Specifically, in the airborne communication server software and the ground-related server software, a same and unique digital identifier is set for the same communication link. For example, the digital identifier of the first communication link shown in FIG. 2 may be ten The hexadecimal number is 0x01, the digital identifier of the second communication link is hexadecimal number 0x02, and the digital identifier of the third communication link is hexadecimal number 0x03. The digital identification encapsulation of the channel switching information is sent to the ground network through the network transmission protocol, as shown in Figure 4;

Preferably, in the link switching information encapsulation and transmission module, the network transmission protocol may select the TCP transmission protocol.

In the link switching information receiving and parsing module, the ground server software receives the network transmission protocol frame from the airborne communication server, parses the cabin using the link digital identifier in the network transmission protocol frame, and saves it locally.

The ground-to-air gateway setting module reads the current ground-to-air gateway information and compares it with the link switching information stored locally, and judges whether the current ground-to-air communication link is used with the airborne communication server according to the comparison result. Whether the link is the same communication link ground-to-air gateway does not change; if it is a different communication link, set the ground-to-air gateway as the link switching information stored locally. As an embodiment, the link switching information of the present invention includes the digital identification of the link.

To sum up, according to the above-mentioned embodiments of the present invention, there is provided a synchronization gateway implementation solution in a ground-air communication scenario with multiple links switching, which solves the problem of gateway switching in a ground-air communication network with multiple links when the links are switched. The problem of asynchronous switching eliminates the influence of link switching on two-way communication, so that two-way communication always uses the same communication link, which ensures the stability and smoothness of communication.

It should be understood that the multi-link intelligent handover synchronization gateway method and system based on ground-air communication of the present invention are different implementations of the same concept, and the parts not described in the device embodiments may refer to the descriptions of the corresponding parts of the method embodiments, and vice versa. .

Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage medium can include: ROM, RAM, magnetic disk or optical disk, etc.

The above-mentioned embodiments further describe the purpose, technical solutions and advantages of the present invention in detail. It should be understood that the above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made to the present invention within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (8)

1. based on the multi-link switching synchronization gateway method of ground-air communication, it is characterized in that: The airborne communication server switches the communication link with the ground network system, that is, when the flight altitude of the aircraft is 0 meters, the airborne communication server switches the communication link to the first communication link; when the flight altitude of the aircraft is greater than 0 meters and the longitude and latitude of the aircraft In the specified longitude and latitude interval, the airborne communication server switches the communication link to the second communication link; when the longitude and latitude of the aircraft leaves the specified longitude and latitude interval, the airborne communication server switches the communication link to the third communication link road; The airborne communication server sends the link switching information to the ground network system; Change the air gateway of the ground network system according to the link switching information parsed by the ground network system; Wherein, the same and unique digital identification is set for the same communication link in the airborne communication server software and the ground related server software. 2 . The multi-link switching synchronization gateway method based on ground-air communication according to claim 1 , wherein the sending of the link switching information by the airborne communication server to the ground network system comprises detecting and comparing the link switching information. 3 . Encapsulation of link switching information, that is, real-time detection of the link switching status of the airborne communication server. If the detection status of the information on the detected link switching is switched, the link switching information of the airborne communication server is encapsulated into a network transmission protocol frame. middle. 3. The multi-link switching synchronization gateway method based on ground-air communication according to claim 2, wherein the encapsulating the link switching information of the airborne communication server into the network transmission protocol frame comprises: reading the currently used The digital identifier of the link is encapsulated into a network transmission protocol frame, and a network transmission protocol frame with link switching information is sent. 4. The multi-link switching synchronization gateway method based on ground-air communication according to claim 1, characterized in that, changing the air-to-air gateway of the ground network system according to the link switching information parsed by the ground network system, comprising: Receive the network transmission protocol frame, parse out the airborne communication server link switching information in the network transmission protocol frame, and save the link switching information locally; Read the current ground-to-air gateway information, compare it with the link switching information stored locally, and judge whether the current ground-to-air communication link and the link used by the airborne communication server are the same communication link according to the comparison result road; If it is the same communication link, the ground-to-air gateway does not change; If it is a different communication link, the ground-to-air gateway is set as the link after switching recorded in the link switching information stored locally. 5. A multi-link switching synchronization gateway system based on ground-air communication, comprising an airborne network and a ground network, the airborne network comprising an airborne network system and an airborne network server, the ground network comprising a ground network interface, and the The airborne communication server is connected to the ground network interface with a communication link, and is characterized in that: The onboard network server includes: The link switching module switches the communication link with the ground network system, that is, when the flight altitude of the aircraft is 0 meters, the onboard communication server switches the communication link to the first communication link; when the flight altitude of the aircraft is greater than 0 meters and the aircraft When the longitude and latitude are within the specified longitude and latitude interval, the onboard communication server switches the communication link to the second communication link; when the longitude and latitude of the aircraft leaves the specified longitude and latitude interval, the onboard communication server switches the communication link to the third communication link link; The link switching information processing module sends the link switching information to the ground network system; The ground network interface includes: The ground-to-air gateway setting module is used to change the air-to-air gateway of the ground network system according to the link switching information in the parsed network protocol frame. 6. The system of the multi-link switching synchronization gateway based on ground-air communication according to 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 The path switching information detection unit is used to detect the link switching status of the airborne communication server in real time. If the information detection status of the detected link switching is switched, the link switching information of the airborne communication server is encapsulated into the network communication protocol frame. . 7. The system of the multi-link switching synchronization gateway based on ground-air communication according to claim 6, wherein the encapsulating the link switching information of the airborne communication server into the network communication protocol frame comprises: reading the current The digital identification of the used link is encapsulated into a network transmission protocol frame, and a network transmission protocol frame with link switching information is sent. 8. The system of the multi-link switching synchronization gateway based on ground-to-air communication according to claim 5, wherein the ground-to-air gateway setting module is used to parse out the link switching information in the network protocol frame to change the ground The air gateway of the network system includes: If it is the same communication link, do not change the ground-to-air gateway; If it is a different communication link, the ground-to-air gateway is set as the link after switching recorded in the link switching information stored locally.

Images