CN111651288B - ARINC628 discrete quantity real-time transmission method and application thereof - Google Patents
ARINC628 discrete quantity real-time transmission method and application thereof Download PDFInfo
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Abstract
The invention discloses an ARINC628 discrete quantity real-time transmission method and application thereof, wherein the method comprises the following steps: network information containing ARINC628 discrete quantity data enters a network port and enters Linux interrupt context; analyzing network information in the Linux interrupt context, and identifying whether the message is ARINC628 discrete quantity information or not according to ARINC628 discrete quantity packet characteristic values; if not, the message is directly transmitted to a Linux network protocol stack and processed by an application program; if yes, analyzing and extracting ARINC628 discrete quantity in the Linux interrupt context, and repacking according to ARINC628 protocol format; after the package, the related function is called in the context of Linux interruption to directly send the data packet to the second system, and the data packet is forwarded to the application layer of the first system.
Description
Technical Field
The invention relates to the technical field of airplane airborne equipment, in particular to an ARINC628 discrete quantity real-time transmission method based on a Linux system and application thereof.
Background
ARINC628 (ARINC is an Aeronautical Radio Inc, an Aeronautical Radio, which is a general name and is mainly responsible for coordinating management and certifying the Radio communication work of airlines, independently of the government) protocol is a standard that defines characteristics of communication specifications, interface parameters, and appliance compatibility, etc. related to the IFE system. The ARINC628 protocol is studied for the specification of discrete quantity transmission when the CCS communicates with the IFE system. With the development of information technology, the Linux System is widely applied to a CCS (bin Core System, hereinafter, referred to as CCS) and an IFE (In-Flight integrity System, hereinafter, referred to as IFE) System, and there is a problem that an ARINC628 packet and a forwarding delay cannot meet protocol standards when implementing an ARINC628 communication protocol under Linux. In communication between the CCS and the IFE system, discrete quantities such as PA broadcasts, smoke alarms, etc. in the CCS system need to be collected on the CCS system by using ethernet, repackaged according to ARINC628 protocol, and then transmitted to the IFE system. Meanwhile, the IFE system reports the information of the audio broadcasting channel, the PA broadcasting channel and the like to the CCS, and the information needs to be collected by the Ethernet, repackaged according to the ARINC628 protocol and then sent to the CCS. In the scenario where the CCS system communicates with the IFE system, the ARINC628 protocol has strict requirements on data forwarding delay. For example, when a CCS system delivers a message to an IFE system, it is required to deliver the message to the IFE system within 25ms after the audio control level information is changed; while passing information to the IFE system within 100ms when other discrete quantities change. When an IFE system passes a message to a CCS system, it is required to forward discrete amounts out within 100 ms.
FIG. 2 is a conventional mode implemented based on ARINC628 protocol in Linux system; the scheme is to reassemble the discrete quantities into ARINC628 data packets and send them on the application. However, the time requirement for the reassembly and delivery of the ARINC628 packet is strict, and the partial type data delivery must satisfy the worst 25ms reaching the peer device, that is, the forwarding time is less than 25ms. Considering that the Linux system is a non-hard real-time operating system, the reliability and stability of completing the ARINC628 data packet reassembly and forwarding in the application layer 25ms cannot be guaranteed.
Disclosure of Invention
The invention aims to solve the technical problem that stable and reliable packaging and forwarding of ARINC628 data packets in 25ms cannot be guaranteed when CCS based on a Linux system communicates with IFE airborne equipment in the prior art, and provides an ARINC628 discrete quantity real-time transmission method and application thereof for solving the problem.
The invention realizes ARINC628 data packet recombination in Linux interrupt context (the invention can be realized at the upper part of interrupt, and also can be realized at the lower part of interrupt), directly sends out data in the interrupt context, and simultaneously monitors ACK signals of corresponding ARINC628 data packets at an application layer; the method can ensure that all ARINC628 data packets are stably and reliably forwarded within 25ms, and is a real-time ARINC628 discrete quantity transmission method under a Linux system platform. The invention improves the forwarding stability and transmission rate of ARINC628 data packets between CCS and IFE airborne equipment, provides a Linux system-based ARINC628 discrete quantity real-time transmission method, and has higher application value.
The invention is realized by the following technical scheme:
an ARINC628 discrete quantity real-time transmission method comprises the following steps:
the discrete quantity of the airborne equipment sends discrete quantity information to a designated port of a first system application program through Ethernet;
network information containing ARINC628 discrete quantity data enters a network port and enters Linux interrupt context through Ethernet;
analyzing network information in the Linux interrupt context, and identifying whether the message is ARINC628 discrete quantity information or not according to ARINC628 discrete quantity packet characteristic values;
if the information is not ARINC628 discrete quantity, the information is directly transmitted to a Linux network protocol stack and is processed by an application program;
if the ARINC628 discrete quantity exists, analyzing and extracting the ARINC628 discrete quantity in the network data packet in the Linux interrupt context, and repacking the ARINC628 discrete quantity according to the ARINC628 protocol format;
after ARINC628 packaging is completed, the related function is called in the Linux interrupt context to directly send ARINC628 data packets to the second system, and the data packets are forwarded to the application layer of the first system.
The working principle is as follows:
based on the traditional mode of ARINC628 protocol implementation in Linux system; the scheme is to reassemble the discrete quantity into ARINC628 data packets on the application program and transmit the data packets. However, the time requirement for the reassembly and delivery of the ARINC628 packet is strict, and the partial type data delivery must satisfy the worst 25ms reaching the peer device, that is, the forwarding time is less than 25ms. Considering that the Linux system is a non-hard real-time operating system, the reliability and stability of completing the ARINC628 data packet reassembly and forwarding in the application layer 25ms cannot be guaranteed.
The method mainly utilizes the Linux interrupt context to directly realize the recombination and the forwarding of the ARINC628 data packet, completes the extraction of the ARINC628 discrete quantity and the recombination and the forwarding of the ARINC628 data packet in the Linux interrupt context, does not need to report the data to an application layer through the layer of a Linux kernel network protocol stack for the recombination and the forwarding of the data, and simultaneously does not need to consider the influence of the Linux system time-sharing scheduling on the ARINC628 data packet forwarding time delay; therefore, the forwarding delay of ARINC628 data packets in the invention is controllable and is less than 25ms, which not only meets the requirement of partial discrete quantity on the forwarding delay, but also improves the forwarding rate of all the rest ARINC628 messages.
The method realizes the recombination and the forwarding of the ARINC628 data packets in the system, and meanwhile, the method is applied to the ARINC628 discrete quantity data packet transmission when the Linux-based CCS system is communicated with the IFE system, thereby improving the forwarding stability and the transmission rate of the ARINC628 data packets between the CCS and the IFE airborne equipment.
Further, still include:
the application layer of the first system receives the ARINC628 data packet forwarded by the Linux interrupt context and then does not forward the ARINC628 data packet to the IFE system, but analyzes the ARINC628 data packet information and monitors the ACK signal of the ARINC628 message according to the information of the message sequence counting MSC field and the like in the data packet.
Further, the ARINC628 message comprises a periodic signal;
if the first system sends a periodic signal, the application layer of the first system waits for an ACK signal of a data packet within 100ms after receiving the ARINC628 data packet forwarded by the driving layer; if the ACK signal is received, the data transmission is successful; if a NAK signal is received or no signal is received within 100ms, the message is discarded and the application layer associated traffic module is notified.
Further, the ARINC628 message includes an aperiodic signal;
if the first system sends a non-periodic signal, the application layer of the first system is set to wait for an ACK signal of a data packet within 100ms after receiving the ARINC628 data packet forwarded by the driving layer; if the ACK signal is received, the data transmission is successful; if NAK signal is received or no signal is received within 100ms, the application layer informs Linux to interrupt the context for retransmission, and if the retransmission times is more than 3 times, the message is discarded and the application layer is informed of the related service.
Further, the method also comprises the following steps:
when the second system receives ARINC628 data packets and other network information, the information is directly uploaded to an application layer through a Linux kernel protocol stack;
the application layer analyzes the network data information, if the network data information is an ARINC628 data packet, the data packet is analyzed, and an ACK signal is replied according to the ARINC628 protocol requirement; if it is a non-ARINC 628 packet, then the parsing process will be performed by other applications.
On the other hand, the invention also provides application of the ARINC628 discrete magnitude real-time transmission method, and software and a system which are realized on the Linux-based CCS system and the IFE system and contain the ARINC628 discrete magnitude real-time transmission method are deployed on the Linux-based CCS system and the IFE system to transmit ARINC628 discrete magnitude data packets when the Linux-based CCS system is communicated with the IFE system.
Among them, an IFE (In-Flight Entertainment System, hereinafter abbreviated as IFE) System is a Flight Entertainment System, and a CCS (Cabin Core System, hereinafter abbreviated as CCS) System is a Cabin Core System.
The method can also be applied to data packet forwarding between any Linux-based systems, realizes a real-time ARINC628 discrete quantity transmission method, and has higher application value.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the method mainly utilizes the Linux interrupt context to directly realize the recombination and forwarding of the ARINC628 data packet, extracts the ARINC628 discrete quantity and recombines and forwards the ARINC628 data packet in the Linux interrupt context, does not need to report the data to an application layer by layer through a Linux kernel network protocol stack for data recombination and forwarding, and does not need to consider the influence of the Linux system time-sharing scheduling on the ARINC628 data packet forwarding delay; therefore, the forwarding delay of ARINC628 data packets in the invention is controllable and less than 25ms, which not only meets the requirement of partial discrete quantity on the forwarding delay, but also improves the forwarding rate of all the other ARINC628 messages;
2. the method realizes the recombination and the forwarding of ARINC628 data packets in the system, and meanwhile, the method is applied to ARINC628 discrete quantity data packet transmission when a Linux-based CCS system is communicated with an IFE system, thereby improving the forwarding stability and the transmission rate of the ARINC628 data packets between CCS and IFE airborne equipment; the method can also be applied to data packet forwarding between any Linux-based systems in airplane airborne equipment, realizes a real-time ARINC628 discrete quantity transmission method, and has high application value.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic diagram of ARINC628 discrete quantity real-time forwarding based on Linux system.
Fig. 2 is a schematic diagram of prior art ARINC628 discrete quantity non-real-time forwarding based on Linux system.
Fig. 3 is a flowchart of an ARINC628 discrete quantity real-time forwarding method based on the Linux system in the embodiment of the present invention.
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 to fig. 3, the method for real-time transmitting ARINC628 discrete quantities according to the present invention includes, in combination with the schematic diagram of real-time forwarding ARINC628 discrete quantities based on the Linux system in fig. 1, and the flowchart of the method for real-time forwarding ARINC628 discrete quantities based on the Linux system in fig. 3, which will be described in detail below:
the procedures of transmitting ARINC628 data packets from the CCS system to the IFE system and from the IFE system to the CCS system are the same as the system design, and the embodiment of the invention discusses the design idea of the real-time transmission method by taking the example of data transmission from the CCS system to the IFE system.
As shown in fig. 3, this includes the following steps:
sending discrete quantity information to a designated port of a CCS system application program by the discrete quantity of the airborne equipment through Ethernet;
network information containing ARINC628 discrete quantity data enters a network port and enters Linux interrupt context through Ethernet;
analyzing network information in the Linux interrupt context, and identifying whether the message is ARINC628 discrete quantity information or not according to ARINC628 discrete quantity packet characteristic values;
if the quantity is not ARINC628 discrete quantity, the message is directly transmitted to a Linux network protocol stack, and the application program processes the message;
if the ARINC628 discrete quantity exists, analyzing and extracting the ARINC628 discrete quantity in the network data packet in the Linux interrupt context, and repacking the ARINC628 discrete quantity according to the ARINC628 protocol format;
after ARINC628 packaging is completed, the related function is called in the Linux interrupt context to directly send an ARINC628 data packet to the IFE system, and the data packet is forwarded to the application layer of the CCS system.
After receiving the ARINC628 data packet forwarded by the Linux interrupt context, the application layer of the CCS system does not forward the ARINC628 data packet to the IFE system, but analyzes the ARINC628 data packet information and monitors the ACK signal of the ARINC628 message according to the information such as the message sequence count MSC field in the data packet.
The ARINC628 message is a periodic signal and a non-periodic signal;
if the CCS system sends the periodic signal, the application layer of the CCS system is set to wait for the ACK signal of the data packet within 100ms after receiving the ARINC628 data packet forwarded by the driving layer; if the ACK signal is received, indicating that the data transmission is successful; if a NAK signal is received or no signal is received within 100ms, the message is discarded and the application layer associated traffic module is notified.
If the CCS system sends a non-periodic signal, an application layer of the CCS system is set to wait for an ACK signal of a data packet within 100ms after receiving the ARINC628 data packet forwarded by a driving layer; if the ACK signal is received, the data transmission is successful; if NAK signal is received or no signal is received within 100ms, the application layer informs Linux to interrupt the context for retransmission, and if the retransmission times is more than 3 times, the message is discarded and the application layer is informed of the related service.
When the IFE system receives ARINC628 data packets and other network information, the information is directly uploaded to an application layer through a Linux kernel protocol stack;
the application layer analyzes the network data information, if the network data information is an ARINC628 data packet, the data packet is analyzed, and an ACK signal is replied according to the ARINC628 protocol requirement; if it is a non-ARINC 628 packet, then the parsing process will be performed by other applications.
In the specific implementation: the present embodiment only uses PA broadcast as an example to discuss the implementation process of sending ARINC628 data packet to the IFE system by the CCS system;
the CCS system and the IFE system are started, and the PA broadcasting microphone is picked up. The CCS system detects the variation of the discrete quantity and sends a PA broadcast on signal to the IFE according to the ARINC628 protocol, and the IFE system receives the signal and then performs corresponding processing.
The PA broadcast microphone is dropped. The CCS system detects the variation of the discrete quantity and sends a PA broadcast shutdown signal to the IFE system according to the ARINC628 protocol, and the IFF system receives the PA broadcast shutdown signal and simultaneously performs corresponding processing.
In addition, the sending of ARINC628 packets from the IFE to the CCS is performed similarly.
The working principle is as follows:
fig. 2 is a schematic diagram of prior art ARINC628 discrete quantity non-real-time forwarding based on Linux system, which is based on a conventional manner of implementing ARINC628 protocol under Linux system; the method comprises the following steps that (1) network information containing ARINC628 discrete quantity data enters a network port and is transmitted to a Linux network port receiving driver, (2) the network information is further transmitted to a Linux kernel network protocol stack from the Linux network port receiving driver, and (3) the network information is further transmitted to an application program from the Linux kernel network protocol stack, the discrete quantity is recombined on the application program into an ARINC628 data packet and is transmitted, and the ARINC628 data packet is returned through (4), (5) and (6); obviously, the conventional method is to reassemble discrete quantities into ARINC628 packets and transmit the packets on an application program, but the time requirement for reassembly and transmission of the ARINC628 packets is strict, and partial type data transmission must meet the worst 25ms reaching the opposite device, that is, the forwarding time is less than 25ms. Considering that the Linux system is a non-hard real-time operating system, the reliability and stability of completing the ARINC628 data packet reassembly and forwarding in the application layer 25ms cannot be guaranteed.
The method mainly utilizes the Linux interrupt context to directly realize the recombination and forwarding of the ARINC628 data packet, extracts the ARINC628 discrete quantity and recombines and forwards the ARINC628 data packet in the Linux interrupt context, does not need to report the data to an application layer by layer through a Linux kernel network protocol stack for data recombination and forwarding, and does not need to consider the influence of the Linux system time-sharing scheduling on the ARINC628 data packet forwarding delay; therefore, the forwarding delay of ARINC628 data packets in the invention is controllable and is less than 25ms, which not only meets the requirement of partial discrete quantity on the forwarding delay, but also improves the forwarding rate of all the rest ARINC628 messages.
The method realizes the recombination and the forwarding of the ARINC628 data packets in the system, and meanwhile, the method is applied to the ARINC628 discrete quantity data packet transmission when the Linux-based CCS system is communicated with the IFE system, thereby improving the forwarding stability and the transmission rate of the ARINC628 data packets between the CCS and the IFE airborne equipment.
Example 2
As shown in fig. 1 to fig. 3, the present embodiment is different from embodiment 1 in that the present invention further provides an application of an ARINC628 discrete quantity real-time transmission method, and software and a system implemented and including the ARINC628 discrete quantity real-time transmission method are deployed on the Linux-based CCS system and the IFE system by using the ARINC628 discrete quantity real-time transmission method, so as to perform ARINC628 discrete quantity data packet transmission when the Linux-based CCS system communicates with the IFE system.
The method can also be applied to data packet forwarding between any Linux-based systems in airplane airborne equipment, realizes a real-time ARINC628 discrete quantity transmission method, and has high application value.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only examples 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 (6)
1. An ARINC628 discrete magnitude real-time transmission method is characterized by comprising the following steps:
sending discrete quantity information to a designated port of a first system application program by the discrete quantity of the airborne equipment through Ethernet;
network information containing ARINC628 discrete quantity data enters a network port and enters Linux interrupt context through Ethernet;
analyzing network information in the Linux interrupt context, and identifying whether the message is ARINC628 discrete quantity information or not according to ARINC628 discrete quantity packet characteristic values;
if the quantity is not ARINC628 discrete quantity, the message is directly transmitted to a Linux network protocol stack, and the application program processes the message;
if the ARINC628 discrete quantity exists, analyzing and extracting the ARINC628 discrete quantity in the network data packet in the Linux interrupt context, and repacking the ARINC628 discrete quantity according to the ARINC628 protocol format;
after ARINC628 packaging is completed, the related function is called in the Linux interrupt context to directly send ARINC628 data packets to the second system, and the data packets are forwarded to the application layer of the first system.
2. The ARINC628 discrete magnitude real-time transmission method as claimed in claim 1, further comprising:
after receiving the ARINC628 data packet forwarded by the Linux interrupt context, the application layer of the first system analyzes the ARINC628 data packet information and monitors an ACK signal of the ARINC628 data packet information according to the information sequence counting MSC field information in the data packet.
3. The ARINC628 discrete magnitude real-time transmission method of claim 2, wherein said ARINC628 data packet information includes periodic signals;
if the first system sends a periodic signal, the application layer of the first system waits for an ACK signal of a data packet within 100ms after receiving the ARINC628 data packet forwarded by the driving layer; if the ACK signal is received, indicating that the data transmission is successful; if a NAK signal is received or no signal is received within 100ms, the message is discarded and the application layer associated traffic module is notified.
4. The ARINC628 discrete magnitude real-time transmission method of claim 2, wherein said ARINC628 data packet information includes non-periodic signals;
if the first system sends a non-periodic signal, the application layer of the first system waits for the ACK signal of the data packet within 100ms after receiving the ARINC628 data packet forwarded by the driving layer; if the ACK signal is received, indicating that the data transmission is successful; if NAK signal is received or no signal is received within 100ms, the application layer informs Linux to interrupt the context for retransmission, and if the retransmission times is more than 3 times, the message is discarded and the application layer is informed of the related service.
5. The ARINC628 discrete magnitude real-time transmission method as claimed in claim 1, further comprising:
when the second system receives ARINC628 data packets and other network information, the information is directly uploaded to an application layer through a Linux kernel protocol stack;
the application layer analyzes the network data information, if the network data information is an ARINC628 data packet, the data packet is analyzed, and an ACK signal is replied according to the ARINC628 protocol requirement; if it is a non-ARINC 628 packet, then the parsing process will be performed by other applications.
6. The ARINC628 discrete quantity real-time transmission method according to claim 1, wherein software and system for implementing and including said ARINC628 discrete quantity real-time transmission method are deployed on the Linux-based CCS system and the IFE system for the ARINC628 discrete quantity data packet transmission when the Linux-based CCS system communicates with the IFE system, using the ARINC628 discrete quantity real-time transmission method according to any one of claims 1 to 5.
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