CN113660029B

CN113660029B - System and method for realizing compatibility of airborne IPS router and ACARS end system

Info

Publication number: CN113660029B
Application number: CN202110948437.8A
Authority: CN
Inventors: 林静; 夏大旺; 崔诗娴; 赵倩隆; 周鑫平; 林瑞琦; 周桢沛
Original assignee: CETC Avionics Co Ltd
Current assignee: CETC Avionics Co Ltd
Priority date: 2021-08-18
Filing date: 2021-08-18
Publication date: 2022-11-01
Anticipated expiration: 2041-08-18
Also published as: CN113660029A

Abstract

The invention discloses a system and a method for an airborne IPS router to be compatible with an ACARS end system, wherein the airborne ACARS end system and a ground IPS application communicate through the airborne IPS router and the ground IPS router; the ACARS adapter module is arranged between the ACARS application and the airborne IPS router and used for realizing mutual mapping between data message information transmitted by the airborne IPS router and GPBOP information transmitted by the ACARS application, establishing a communication peer end between the airborne ACARS end system and a ground DS user, and communicating between the resident airborne application developed based on the ACARS protocol stack and the ground application developed based on the IPS without updating the ACARS end system, so that the cost of upgrading and transforming the airplane is reduced, the complexity of deploying an airborne IPS network is reduced, and the deployment time is shortened.

Description

System and method for realizing compatibility of airborne IPS router and ACARS end system

Technical Field

The invention relates to the technical field of aviation communication, in particular to a system and a method for an airborne IPS router to be compatible with an ACARS end system.

Background

After explicitly using an IP-based network to provide aviation ground services, the International Civil Aviation Organization (ICAO) is considering building an air-ground communication domain using an IP network, and a corresponding industry standard is being established. A set of standards selected from the IP protocol suite that meet the requirements of aviation security communications is known as the IP Suite (IPs). In an air-ground communication domain constructed based on IPS, an airborne IPS router replaces an existing Aircraft Communication Addressing Reporting System (ACARS) router, and IPS network layer and transmission layer services are provided for airborne applications. ACARS routers are also known in some models as Communication Management Units (CMUs) or Air Traffic Service Units (ATSU). The interface provided by the IPS router to the upper layer on-board application follows the dialogue Service (Dialog Service) definition defined by the ICAO Doc 9869, while the communication between the ACARS router and the upper layer on-board application follows the general bit-oriented communication protocol (GPBOP) protocol defined by ARINC 619. The difference between the two is large, after the airborne IPS router replaces the ACARS router, the original airborne application developed based on the ACARS router needs to be updated according to the ICAO Doc 9869 if the service provided by the IPS router needs to be used.

However, many applications developed based on ACARS routers reside in ACARS end systems. ACARS end systems include Flight Management Systems (FMS), on-board maintenance systems (OMS), electronic Flight Bag (EFB), and the like. Therefore, updating the onboard application developed based on the ACARS router means that the ACARS end systems need to be updated, which is a huge and complex project.

Therefore, there is a need for a method that enables compatibility of ACARS end systems within an onboard IPS router, such that onboard ACARS applications residing in ACARS end systems do not need to be updated, but adaptation to different ACARS end systems is achieved by the IPS router.

Disclosure of Invention

The invention aims to solve the technical problem of how to realize the communication between the ACARS application and the ground IPS application under the condition that an ACARS end system is not updated, and aims to provide a system and a method for realizing the compatibility of an airborne IPS router and the ACARS end system.

The invention is realized by the following technical scheme:

the system of the airborne IPS router compatible with the ACARS end system comprises an ACARS application installed in the airborne ACARS end system, an airborne IPS router, a ground IPS application and a ground IPS router, wherein,

the airborne IPS router and the ground IPS router communicate through an IPS network;

the airborne ACARS end system and the ground IPS application communicate through an airborne IPS router and a ground IPS router;

an ACARS adapter module is arranged between the ACARS application and the airborne IPS router and used for realizing mutual mapping between data message information transmitted by the airborne IPS router and GPBOP information transmitted by the ACARS application and establishing a communication peer end between the airborne ACARS end system and a ground DS user.

Further, for the GPBOP message received from the ACARS application, the ACARS adapter module maps the Origin Code field in the GPBOP message into a source port number and a destination port number of a UDP user datagram header so as to realize the association between the airborne ACARS application and the ground IPS application; mapping a Dest Code field in the GPBOP message to a Diffserv value in an IP data header; the purpose of selecting an air-ground communication subnet according to the application requirement of the airborne ACARS is achieved; judging whether a Message Content field in the GPBOP Message contains a supplement Address or not, if not, filling a destination Address field of an IP datagram header by the ACARS adapter module according to the flight number; if the Message Content field contains supplement Address, the ACRSSS adapter module fills a destination Address field of the IP datagram according to the supplement Address and maps the flight number into a destination Address of the IP datagram header, thereby supporting the addressing operation between the airborne ACARS end system and the ground peer end.

Furthermore, when the ACARS adapter module sends the GPBOP Message received from the ACARS application to the airborne IPS router, the Content of the Message Content field in the GPBOP Message is compressed and loaded into the User Data field in the datagram ATNPKT to be transmitted to the airborne IPS router, and therefore the air-ground communication efficiency is improved.

Further, the ACARS adapter module maps a source port number and a destination port number of a UDP user datagram header received from the airborne IPS router to a Dest Code field in the GPBOP message, so as to implement association between the ground IPS application and the airborne ACARS application; the Diffserv value in the IP data header is mapped to the Origin Code field in the GPBOP message to feed back to the onboard ACARS application from which air-to-ground communication subnet the upstream message was received.

Further, when the ACARS adapter module transmits the datagram received from the airborne IPS router to the ACARS application, the Content of the User Data field in the received datagram ATNPKT is decompressed and is loaded into the Message Content field of the GPBOP Message, and the Message Content field is stored in the GPBOP Message to be transmitted according to the format, so that the airborne ACARS application can identify the Message Content.

Further, when the ACARS adapter module sends and receives messages between the ACARS application and the IPS router, the ACARS adapter module manages the IPS DS state machine according to the requirements of the ICAO Doc 9886.

In the method for the airborne IPS router to be compatible with the ACARS end system, for the downlink message transmitted from the ACARS application to the airborne IPS router, the ACARS adapter module maps the received GPBOP message to the data message of the airborne IPS router;

for the uplink message transmitted from the onboard IPS router to the ACARS application, the ACARS adapter module maps the received data message into the GPBOP message of the ACARS application.

Further, for the downlink message, the ACARS adapter module maps the Origin Code field in the GPBOP message into a source port number and a destination port number of a UDP user datagram header and stores the source port number and the destination port number in the UDP datagram to be transmitted according to a message format, so as to realize association between the airborne ACARS application and the ground IPS application;

the ACARS adapter module maps a Dest Code field in the GPBOP message into a Diffserv value in an IP data header and stores the Diffserv value in an IP datagram to be transmitted according to a message format so as to achieve the purpose of selecting an air-ground communication subnet according to the application requirement of an airborne ACARS;

the ACARS adapter module judges whether the Message Content field in the GPBOP Message contains a supplement Address or not, if not, the ACARS adapter module fills a destination Address field of the IP datagram header according to the flight number and stores the destination Address field into the IP datagram to be transmitted according to the Message format; if the Message Content field contains a supplement Address, the ACRSS adapter module fills a destination Address field of the IP datagram according to the supplement Address and stores the destination Address field into the IP datagram to be transmitted according to a Message format, so that the addressing operation between the airborne ACARS end system and the ground peer end is supported;

the ACARS adapter module compresses the Content of the Message Content field in the GPBOP Message and loads the User Data field of the UDP datagram ATNPKT to be transmitted, thereby improving the air-ground communication efficiency;

the ACARS adapter module transmits UDP datagram to be transmitted and IP datagram to be transmitted to the airborne IPS router;

and the airborne IPS router transmits the analyzed data to the ground IPS router by analyzing the UDP datagram to be transmitted and the IP datagram to be transmitted.

Further, for the uplink message, the ACARS adapter module maps the source port number and the destination port number of the header of the received UDP user datagram to a Dest Code field in the GPBOP message and stores the Dest Code field in the to-be-transmitted GPBOP message according to a GPBOP message format, so as to realize association between a ground IPS application and an airborne ACARS application;

the ACARS adapter module maps a Diffserv value in an IP data header into an Origin Code field in a GPBOP message and stores the Diffserv value in the GPBOP message according to a GPBOP message format to the GPBOP message to be transmitted, so that the airborne ACARS application feeds back the air-to-ground communication subnet from which the uplink message is received;

the ACARS adapter module decompresses the Content of the User Data field of the UDP User Data Message ATNPKT, loads the User Data field into the Message Content field of the GPBOP Message and stores the Message Content field into the GPBOP Message to be transmitted according to the format, so that the airborne ACARS application can identify the Message Content;

the ACARS adapter module transmits the GPBOP message to be transmitted to the ACARS application; the ACARS application completes communication with the ground IPS application by analyzing the GPBOP message to be transmitted.

Compared with the prior art, the invention has the following advantages and beneficial effects:

1. the system and the method have the advantages that the ACARS adapter module is arranged in the airborne IPS router, so that mutual mapping between data message information transmitted by the airborne IPS router and GPBOP information transmitted by ACARS application is realized, a peer end of communication is established between the airborne ACARS end system and a ground DS user, the ACARS end system is compatible in the airborne IPS router, communication between the airborne application which is resident in the ACARS end system and developed based on the ACARS protocol stack and the ground application developed based on the IPS can be realized without updating the ACARS end system, the cost of upgrading and transforming an airplane is reduced, the complexity of deploying the airborne IPS network is reduced, and the deployment time is shortened;

2. the ACARS adapter module manages the DS state machine according to the requirements of ICAO Doc 9886 when the ACARS application and the IPS router send and receive messages, so that the states of the IPS DS state machine in the ACARS adapter and the IPS DS state machine in the ground IPS router are kept synchronous.

Drawings

In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort. In the drawings:

FIG. 1 is a schematic diagram of a system framework in one embodiment;

fig. 2 is a mapping relationship diagram in an embodiment, where (a) shows a mapping relationship between messages when an ACARS adapter module sends a downlink message, and (b) shows a mapping relationship between messages when an ACARS adapter module receives an uplink message.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.

Example 1

As shown in fig. 1, embodiment 1 a system of an airborne IPS router compatible with an ACARS end system includes an ACARS application installed in the airborne ACARS end system, an airborne IPS router, a ground IPS application, and a ground IPS router, wherein,

the airborne IPS router communicates with the ground IPS router through an IPS network;

For a GPBOP message received from the ACARS application, the ACARS adapter module maps an Origin Code field in the GPBOP message into a source port number and a destination port number of a UDP user datagram header so as to realize the association between the airborne ACARS application and the ground IPS application; mapping a Dest Code field in the GPBOP message to a Diffserv value in an IP data header; the purpose of selecting an air-ground communication subnet according to the application requirement of the airborne ACARS is achieved; judging whether a Message Content field in the GPBOP Message contains a complementary Address, if not, filling a destination Address field of an IP datagram header by the ACARS adapter module according to the flight number; if the Message Content field contains supplement Address, the ACRSSS adapter module fills a destination Address field of the IP datagram according to the supplement Address and maps the flight number into a destination Address of the IP datagram header, thereby supporting the addressing operation between the airborne ACARS end system and the ground peer end.

When the ACARS adapter module sends the GPBOP Message received from the ACARS application to the airborne IPS router, the Content of the Message Content field in the GPBOP Message is compressed and is loaded into the User Data field in the datagram ATNPKT to be transmitted to the airborne IPS router, and therefore the air-ground communication efficiency is improved.

The ACARS adapter module maps a source port number and a destination port number of a UDP user datagram header received from the airborne IPS router into a Dest Code field in the GPBOP message so as to realize the association between the ground IPS application and the airborne ACARS application; the Diffserv value in the IP data header is mapped to the Origin Code field in the GPBOP message to feed back to the onboard ACARS application from which air-to-ground communication subnet the upstream message was received.

When the ACARS adapter module transmits the datagram received from the airborne IPS router to the ACARS application, the Content of the User Data field in the received datagram ATNPKT is decompressed and is packed into the Message Content field of the GPBOP Message and is stored into the GPBOP Message to be transmitted according to the format, so that the airborne ACARS application can identify the Message Content.

When the ACARS adapter module sends and receives messages between the ACARS application and the IPS router, the ACARS adapter module manages the IPS DS state machine according to the requirements of ICAO Doc 9886.

Specifically, the format of the aforementioned GPBOP message is stored as follows:

Origin Code

Purpose/Nature

Dest Code

Reserved

Message Content

the description of each field in the GPBOP message format is as in table 1:

table 1 description of the GPBOP message fields

Specifically, the above-mentioned ATNPKT represents: the information passed between peer DS users during DS primitive processing according to ICAO Doc 9869 is called ATNPKT, which carries the data part in the transport protocol (TCP or UDP). ATNPKT is used to convey service primitive parameters that cannot be mapped to existing IP or transport protocol header fields. The ATNPKT will also deliver information indicating the functionality of the DS protocol, e.g. a DS primitive type.

To improve bandwidth usage efficiency, ATNPKT uses a variable length format to allow for optimized processing of DS primitives. The ATNPKT format includes two parts, a fixed length and a variable length. The variable length part is an optional parameter (option field) of the ATNPKT, and which options are present in the ATNPKT are indicated by corresponding flag bits of the "present flag" field of the fixed length part. The ATNPKT format is represented as follows:

wherein the ATNPKT version indicates a version of the ATNPKT header;

the DS primitive is set by ACARS adapter module in airborne IPS router and IPS DS module in ground IPS router, indicating the packet DS primitive type, and the DS primitive field value and corresponding DS primitive in ATNPKT are as shown in table 2:

TABLE 2 DS primitive field values in ATNPKT

Value of	DS primitive
		1	D-START
2	D-STARTCNF
		3	D-END
4	D-ENDCNF
		5	D-DATA
6	D-ABORT
		7	D-UNIT-DATA
8	D-ACK
		9	D-KEEPALIVE

The application technology type represents the type of the application program information carried by the identifier;

m (more) indicates M bits for fragmentation and reassembly of UDP datagrams, a value of 0 indicates a single or last segment; the value 1 represents a first or intermediate segment;

the presence flag indicates that the field is a series of flag bits indicating whether an option field exists in the variable length portion of ATNPKT, a flag bit value of 0 indicates that the corresponding option field does not exist, and a value of 1 indicates that the corresponding option field exists.

The option field indicates that it will be provided based on the DS primitive being called and the current state of the application, and the location of the option field in the ATNPKT variable section should match its relative location in the presence flag field (i.e., the option is in the same order as the presence flag);

each option field may be either V format (value) or LV format (length + value), as shown in table 3, listing all optional fields.

Table 3 presence flags and options field

Example 2

As shown in fig. 2, embodiment 2 provides a method for an airborne IPS router to be compatible with an ACARS end system, where, for a downlink message transmitted from an ACARS application to the airborne IPS router, an ACARS adapter module maps a received GPBOP message to a data message of the airborne IPS router;

for the uplink messages transmitted from the onboard IPS router to the ACARS application, the ACARS adapter module maps the received data message into a GPBOP message of the ACARS application.

As shown in fig. 2 (a), for the downlink message, the ACARS adapter module maps the Origin Code field in the GPBOP message into a source port number and a destination port number of a UDP user datagram header, and stores the source port number and the destination port number in the UDP datagram to be transmitted according to a message format, so as to implement association between an airborne ACARS application and a ground IPS application;

As shown in fig. 2 (b), for the uplink message, the ACARS adapter module maps the source port number and the destination port number of the received UDP user datagram header to a Dest Code field in the GPBOP message and stores the Dest Code field in the GPBOP message to be transmitted according to the GPBOP message format, so as to implement association between the ground IPS application and the airborne ACARS application;

the ACARS adapter module maps a Diffserv value in an IP data header into an Origin Code field in a GPBOP message and stores the Origin Code field in the GPBOP message to be transmitted according to the GPBOP message format, so that the airborne ACARS application feeds back the air-ground communication subnet from which the uplink message is received;

the ACARS adapter module decompresses the Content of the User Data field of the UDP User datagram ATNPKT, loads the decompressed User Data field into the Message Content field of the GPBOP Message and stores the Message Content field into the GPBOP Message to be transmitted according to the format, so that the airborne ACARS application can identify the Message Content;

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Those skilled in the art will appreciate that all or part of the steps of the above-described facts and methods can be implemented by a program instructing relevant hardware to perform the steps, and the related program or the described program can be stored in a computer-readable storage medium, and the program, when executed, includes the steps of: corresponding method steps are introduced here, and the storage medium may be a ROM/RAM, a magnetic disk, an optical disk, etc.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. The system for the airborne IPS router to be compatible with the ACARS end system is characterized by comprising an ACARS application, an airborne IPS router, a ground IPS application and a ground IPS router which are arranged in the airborne ACARS end system, wherein,

an ACARS adapter module is arranged between the ACARS application and the airborne IPS router, and is used for realizing mutual mapping between data message information transmitted by the airborne IPS router and GPBOP information transmitted by the ACARS application and establishing a communication peer end between the airborne ACARS end system and a ground DS user;

for a GPBOP message received from an ACARS application, the ACARS adapter module maps an Origin Code field in the GPBOP message into a source port number and a destination port number of a UDP user datagram header and maps a Dest Code field in the GPBOP message into a Diffserv value in an IP data header; judging whether a Message Content field in the GPBOP Message contains a complementary Address, if not, filling a destination Address field of an IP datagram header by the ACARS adapter module according to the flight number; if the Message Content field contains a complementary Address, the ACARS adapter module fills the destination Address field of the IP datagram according to the complementary Address.

2. The system of claim 1, wherein the ACARS adapter module is configured to transmit a Message Content field of a GPBOP Message received from an ACARS application to the airborne IPS router, wherein the Message Content field of the GPBOP Message is compressed and loaded into a User Data field of an ATNPKT datagram for transmission to the airborne IPS router.

3. The system of claim 1, wherein the ACARS adapter module maps a source port number and a destination port number of a UDP user datagram header received from the airborne IPS router to a Dest Code field in a GPBOP message and a Diffserv value in an IP data header to an Origin Code field in the GPBOP message.

4. The system of claim 3, wherein the onboard IPS router is compatible with an ACARS end-system,

when the ACARS adapter module transmits the datagram received from the airborne IPS router to the ACARS application, the Content of the User Data field in the received datagram ATNPKT is decompressed and is loaded into the Message Content field of the GPBOP Message, and the Message Content field is stored into the GPBOP Message to be transmitted according to the format.

5. The system of claim 1, wherein the ACARS adapter module manages the IPSDS state machine according to ICAO Doc 9886 requirements when the ACARS adapter module sends and receives messages between an ACARS application and the IPS router.

6. A method for enabling an airborne IPS router to be compatible with an ACARS end system is characterized in that,

for downlink messages transmitted from the ACARS application to the airborne IPS router, the ACARS adapter module maps the received GPBOP messages to data message messages of the airborne IPS router;

for the uplink message transmitted from the airborne IPS router to the ACARS application, the ACARS adapter module maps the received data message to the GPBOP message of the ACARS application;

for the said downstream message(s) it is,

the ACARS adapter module maps an Origin Code field in the GPBOP message into a source port number and a destination port number of a UDP user datagram header and stores the source port number and the destination port number into a UDP datagram to be transmitted according to a message format;

the ACARS adapter module maps a Dest Code field in the GPBOP message into a Diffserv value in an IP data header and stores the Diffserv value in an IP datagram to be transmitted according to a message format;

the ACARS adapter module judges whether the Message Content field in the GPBOP Message contains a supplement Address or not, if not, the ACARS adapter module fills a destination Address field of the IP datagram header according to the flight number and stores the destination Address field into the IP datagram to be transmitted according to the Message format; if the Message Content field contains a supplement Address, the ACARS adapter module fills a destination Address field of the IP datagram according to the supplement Address and stores the destination Address field into the IP datagram to be transmitted according to a Message format;

the ACARS adapter module compresses the Content of the Message Content field in the GPBOP Message and loads the Content into a User Data field of UDP datagram ATNPKT to be transmitted;

7. The method of claim 6, wherein for the upstream message,

the ACARS adapter module maps a source port number and a destination port number of a received UDP user datagram header into a Dest Code field in the GPBOP message and stores the Dest Code field in the GPBOP message to be transmitted according to a GPBOP message format;

the ACARS adapter module maps a Diffserv value in an IP data header into an Origin Code field in a GPBOP message and stores the Origin Code field in the GPBOP message to be transmitted according to a GPBOP message format;

the ACARS adapter module decompresses the Content of the User Data field of the UDP User datagram ATNPKT, loads the decompressed User Data field into the Message Content field of the GPBOP Message and stores the decompressed User Data field into the GPBOP Message to be transmitted according to the format;

8. The method of claim 6, wherein the ACARS adapter module manages the IPSDS state machine according to ICAO Doc 9886 requirements when the ACARS adapter module sends and receives messages between the ACARS application and the IPS router.