CN115396532A - Low-cost aviation Ethernet implementation method and system based on Ethernet udp protocol - Google Patents

Abstract

The invention provides a low-cost aviation Ethernet implementation method and a system based on an Ethernet udp protocol, wherein a response type communication mechanism is adopted by a client and a server, the client sends a data packet to the server and then enters a packet loss retransmission judgment mode, the server waits for a response returned by the server, the client judges the packet loss retransmission mechanism of the returned data packet after receiving the response, and if the current data packet is not lost, the client sends the next data packet to the server; and if the current data packet is lost, the client resends the current data packet to the server. The invention improves the reliability of data transmission based on the Ethernet udp protocol and realizes the purpose that the Ethernet udp protocol can transmit high-capacity, real-time and reliable data.

Description

Implementation method and system of low-cost aviation Ethernet based on Ethernet UDP protocol

technical field

The invention relates to the technical field of aviation Ethernet, in particular to a low-cost aviation Ethernet implementation method and system based on the Ethernet UDP protocol.

Background technique

Ethernet is the most widely used data bus with simple specifications, easy maintenance, and easy upgrade and expansion. In Ethernet-based data transmission, reliable delivery services can be provided for data transmission through the "three-way handshake, four-way handshake" mechanism of the TCP (Transmission Control Protocol, Transmission Control Protocol) protocol. This transmission method is not suitable for taking up too many system resources Real-time, large-capacity data transmission. The udp (User Datagram Protocol, User Datagram Protocol) protocol does not need to establish a connection, has good real-time performance, and is suitable for large-capacity data transmission, but this transmission method does not provide congestion control and flow control, and cannot guarantee reliable delivery of data. Therefore, it is necessary to provide a low-cost aviation ethernet implementation method based on ethernet udp protocol to ensure real-time and reliability of transmission.

Contents of the invention

In view of this, the embodiment of the present application provides a low-cost aviation Ethernet implementation method and system based on the Ethernet udp protocol, so as to improve the reliability of data transmission based on the Ethernet udp protocol, and realize that the Ethernet udp protocol can transmit The purpose of large capacity, real-time and reliability data.

The embodiment of the present application provides the following technical solutions: a low-cost aviation Ethernet implementation method based on the Ethernet udp protocol, the client and the server adopt a response-response communication mechanism, and the client sends a data packet to the server and enters packet loss Resend judgment mode, and wait for the server to send back a response. After the client receives the response, it will judge the packet loss and resend mechanism for the returned data packet. If the current data packet is not lost, the client will send the next one to the server. Data packet; if the current data packet is lost, the client resends the current data packet to the server.

According to an implementation manner of the embodiment of the present application, before sending the data packet to the server, the client splits the data to be sent and generates a udp data packet with identification information.

According to an implementation manner of an embodiment of the present application, the packet loss retransmission mechanism includes that the client uses a time blocking method to determine whether a data packet is lost, and the client sends a udp data packet to the server and waits for the server to return a response , if the client does not receive a response from the server within the preset time, the client resends the current data packet to the server.

According to an implementation manner of the embodiment of the present application, after receiving the udp data packet, the server side splits the current udp data packet, packs the identification information of the current udp data packet, and uses the packed data packet as The return response is sent to the client.

According to an implementation manner of the embodiment of the present application, the packet loss retransmission mechanism further includes: after the client receives the reply from the server, it parses and detects the identification information carried in the current data packet, and if it is the same as When the identification information of the data packet sent this time is inconsistent, the client resends the current data packet to the server.

According to an implementation manner of the embodiment of the present application, the udp data packet includes a header part and a payload data part, and the header part includes identification information of total packet number, sequence number, time stamp, and total packet length.

According to an implementation manner of the embodiment of the present application, when the client resends the current data packet to the server, if the cumulative number of resends exceeds a preset value, the client outputs a failure message.

The application also provides a low-cost aviation Ethernet implementation system based on the Ethernet udp protocol, including:

The client, the client includes a data packet sending module, a response reception judgment module, and a data packet retransmission module;

The server end, the server end includes a data packet receiving module, a data packet parsing module, and a response packet return module;

The data packet sending module is used to send a data packet to the server, the data packet receiving module is used to wait for and receive the data packet sent by the data packet sending module, and the data packet parsing module is used to analyze the received data The packet is analyzed, and the response packet return module is used to return the analyzed data packet to the response reception judgment module; the response reception judgment module is used to perform a packet loss retransmission mechanism judgment on the returned data packet , if the current data packet is not lost, the data packet sending module sends the next data packet to the data packet receiving module; if the current data packet is lost, the data packet retransmission module sends the data packet to the data packet receiving module Resend the current packet.

According to an implementation manner of the embodiment of the present application, when the response receiving and judging module judges the packet loss retransmission mechanism, time blocking is used to judge whether the data packet is lost, and after the data packet sending module sends the udp data packet to the server Waiting for a response from the server, if the response receiving judgment module does not receive a response from the server within a preset time, the data packet retransmission module resends the current data packet to the server.

According to an implementation manner of the embodiment of the present application, when the response reception judgment module judges the packet loss retransmission mechanism, it also includes: after using the time blocking method to judge whether the data packet is lost, if the response reception judgment module is within the preset After receiving the return response from the server within the specified time, continue to analyze the return response from the server, and detect the identification information carried in the current data packet. If it is inconsistent with the identification information of the data packet sent this time, the data packet The resending module resends the current data packet to the server.

Compared with the prior art, a low-cost aviation Ethernet implementation method and system based on the Ethernet udp protocol proposed by the present invention, based on the udp protocol, adopts a self-defined packet loss retransmission mechanism, which can reduce the delay caused by packet loss Reduce to the minimum, realize the ethernet udp protocol can transmit large capacity, real-time and reliable data transmission. Its beneficial effects are as follows:

1. The client and server adopt a response-response communication mechanism based on the UDP protocol, which can ensure the reliable delivery and real-time transmission of the sent data packets at the application layer.

2. There are two triggering conditions for the client’s data packet retransmission mechanism: first, the client does not receive the data packet sent back by the server within the blocking time; second, the reply packet received by the client identifies the The information is not the currently sent data identification packet information. When one of the above two occurs, it will trigger the client data retransmission, which effectively guarantees the correctness of the data.

3. The client completes the unpacking and sending of the sent data, and judges whether the udp packet is sent successfully. The server is transparently transmitted, and only extracts and returns the data packet identification information. There is no need to add any judgment, and the data packet loss judgment and retransmission The transmission mechanism is decoupled from the server side to facilitate the implementation of this method.

4. This method is a pure software implementation method, without changing the hardware and configuration of the implementation system, without adding new equipment, and can be well compatible with the network of the existing system.

5. The access and exit of network nodes in the system will not affect the interactive communication between the system and other nodes, and can be accessed and exited at any time, which is easy to realize network expansion.

6. The method and system are developed based on standard C language, support mainstream operating systems Windows, Linux, and VXworks, are easy to transplant, different operating systems can realize intercommunication, and network nodes can be flexibly deployed.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings that need to be used in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

Fig. 1 is the work flowchart of the method for the embodiment of the present invention;

Fig. 2 is a system structure block diagram of an embodiment of the present invention.

Detailed ways

Embodiments of the present application will be described in detail below in conjunction with the accompanying drawings.

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and embodiments, and the technical solution of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

The embodiment of the present invention provides a low-cost aviation Ethernet implementation method based on the Ethernet udp protocol. The client and the server adopt a response-response communication mechanism; The data is split, and a udp data packet with identification information is generated. After the client sends the udp data packet to the server, it enters the packet loss retransmission judgment mode, and waits for the server to send back a response. The server receives the udp data packet Afterwards, the current udp data packet is split, and the identification information of the current udp data packet is packaged, and the packaged data packet is sent to the client as the return response; after the client receives the response, the The returned data packet is judged by the packet loss and resend mechanism. If the current data packet is not lost, the client sends the next data packet to the server; if the current data packet is lost, the client resends the current data packet to the server. . When the client resends the current data packet to the server, if the cumulative number of resends exceeds the preset value, the client will output a fault message.

The udp data packet includes a header part and a payload data part, and the header part includes total packet number, sequence number, time stamp, and total packet length identification information.

The packet loss retransmission mechanism includes that the client uses a time blocking method to determine whether the data packet is lost, and the client sends the udp packet to the server and waits for the server to send back a response. If the client does not receive the packet within a preset time If the response is returned to the server, the client resends the current packet to the server. The packet loss retransmission mechanism further includes: after the client receives the response from the server, it parses and detects the identification information carried by the current data packet, and if it is inconsistent with the identification information of the currently sent data packet, then The client resends the current packet to the server.

The client and the server in the embodiment of the present invention adopt a response communication mechanism. After the client sends the data packet, it waits for the server to send back a response. After receiving the response, the client sends the next packet of data; the server always waits for the data packet sent by the client. After receiving the data packet, it returns a response to the client. The data packet is received successfully, waiting to receive the next packet of data.

Both the client and the server can configure the size of the network buffer based on the udp protocol to increase the communication rate.

As shown in Figure 1, the Ethernet implementation method process of the embodiment of the present invention specifically includes the following steps:

In step P1, the data packet encapsulation module of the client splits the total data packet to be sent into the maximum data packet length supported by the udp protocol. This embodiment divides 65535 bytes and generates a udp data packet with identification information. Each data packet contains header and payload data, and the content of the header includes identification information, including the total number of packets, sequence number, timestamp, and total packet length;

Step P2, the data packet sending module of the client sends the encapsulated udp data packets sequentially based on the Ethernet udp protocol format in the form of a single packet;

Step P3, the data packet receiving module on the server side continues to wait for receiving the udp data packet, and automatically receives it;

Step P4, the server-side data packet parsing module parses the received udp data packet out of the payload data packet and the data packet header containing the identification information, and extracts the identification information of the current data packet;

Step P5, the server side puts the payload data extracted from the udp data packet into the preset storage area, and returns the identification information, and keeps waiting to receive the data after the return;

Step P6, the client's response receiving judgment module judges whether the udp data packet is lost, first adopts the time blocking mode, if the return data packet of the server end is not received within the predetermined time after sending the data packet, then it is judged that the current udp data packet is lost; If the client receives the data packet returned by the server at the scheduled time, it will parse out the returned identification information and check whether the identification information is correct. If it is inconsistent with the currently sent data packet identification information, it will be judged that the current udp data packet has been lost. If consistent, call the data packet sending module to continue sending the next packet;

Step P7, optionally, is used for the client to call the data packet resending module to resend the current data packet based on the identification information of the current udp data packet when judging that the udp data packet is lost.

As shown in Figure 2, the low-cost aviation Ethernet implementation system based on the Ethernet udp protocol of the embodiment of the present invention, the client 51 includes:

The packet encapsulation module 21 is used for the client 51 to split the total packet to be sent into the maximum length supported by the udp protocol packet, and generate a udp packet with identification information, each packet Contains header and payload data, the content of the header is the identification information, including the total number of packets, serial number, timestamp, total packet length, etc.;

Packet sending module 22 is used for client 51 to send encapsulated udp packets in the form of a single packet based on the Ethernet udp protocol format;

Response reception judging module 23 is used for the client 51 to judge whether the udp data packet is lost, first adopts the time blocking mode, if the return data packet of the server end 52 is not received within the predetermined time after sending the data packet, then judge the current The udp data packet has been lost; further, if the returned data packet is received, the returned identification information is parsed out, and whether the identification information is checked is correct. If it is inconsistent with the current data packet identification information, it is judged that the current udp data packet has been lost. If consistent then call data packet sending module 22 and continue to send next bag;

The data packet resending module 24 is used for the client 51 to resend the current data packet when it has been judged that the udp data packet is lost.

The server end 52 of the embodiment of the present invention includes:

The packet receiving module 31 is used for the server end 52 to receive data based on the udp protocol, and the server end 52 continues to wait for receiving the udp packet after starting, and is automatically received;

The data packet analysis module 32 is used for the server end 52 to parse the received udp data packet out of the payload data packet and the data packet header containing the identification information, and extract the identification information of the current data packet;

The response packet return module 33 is used for the server 52 to put the payload data extracted from the udp data packet into the cache, and return the identification information, and keep waiting for receiving data after the return.

In the embodiment of the present invention: based on the client 51 and the server 52 using a response communication mechanism, the data packet sending module 22 of the client 51 sends data, the data packet receiving module 31 of the server 52 receives data, and the response packet of the server 52 The return module sends back immediately, the response receiving judgment module 23 of the client 51 receives the response return packet of the server 52 , and the client 51 invokes the data packet sending module 22 or the data packet retransmission module 24 .

The above is only a specific embodiment of the application, but the scope of protection of the application is not limited thereto. Any person familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application. All should be covered within the scope of protection of this application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims (10)

1. A low-cost aviation Ethernet implementation method based on the Ethernet udp protocol is characterized in that: the client and the server end adopt a response-response communication mechanism, and the client enters packet loss and retransmission judgment after sending a data packet to the server end mode, and wait for the server to send back a response. After the client receives the response, it will judge the packet loss and retransmission mechanism for the returned data packet. If the current data packet is not lost, the client will send the next data packet to the server; If the current data packet is lost, the client resends the current data packet to the server. 2. the low-cost aviation Ethernet implementation method based on Ethernet udp protocol according to claim 1, is characterized in that: before the client sends data packets to the server end, the data to be sent is split, and the data with A udp packet of identification information. 3. the low-cost aviation Ethernet implementation method based on Ethernet udp protocol according to claim 2, is characterized in that: described packet loss retransmission mechanism comprises, described client adopts time blocking mode to judge whether data packet is lost , the client sends a udp data packet to the server and waits for the server to return a response. If the client does not receive the server’s return response within the preset time, the client resends the current data packet to the server. 4. the low-cost aviation Ethernet implementation method based on Ethernet udp protocol according to claim 3, is characterized in that: after the server end receives the udp data packet, the current udp data packet is split, and The identification information of the current udp data packet is packaged, and the packaged data packet is sent to the client as the return response. 5. The low-cost aviation Ethernet implementation method based on Ethernet udp protocol according to claim 3, characterized in that: the packet loss retransmission mechanism also includes, when the client receives the reply from the server end After the response is transmitted, the identification information carried by the current data packet is analyzed and detected. If it is inconsistent with the identification information of the currently sent data packet, the client resends the current data packet to the server. 6. the low-cost aviation Ethernet implementation method based on Ethernet udp protocol according to claim 2, is characterized in that: described udp data packet comprises header part and payload data part, and described header part comprises total number of packets, Sequence number, time stamp, total packet length identification information. 7. the low-cost aviation Ethernet implementation method based on Ethernet udp protocol according to claim 1, is characterized in that: when the client resends the current data packet to the server end, if the number of times of resending exceeds the preset value , the client outputs the fault information. 8. A low-cost aviation Ethernet implementation system based on Ethernet udp protocol, characterized in that: comprising: The client, the client includes a data packet sending module, a response reception judgment module, and a data packet retransmission module; The server end, the server end includes a data packet receiving module, a data packet parsing module, and a response packet return module; The data packet sending module is used to send a data packet to the server, the data packet receiving module is used to wait for and receive the data packet sent by the data packet sending module, and the data packet parsing module is used to analyze the received data The packet is analyzed, and the response packet return module is used to return the analyzed data packet to the response reception judgment module; the response reception judgment module is used to perform a packet loss retransmission mechanism judgment on the returned data packet , if the current data packet is not lost, the data packet sending module sends the next data packet to the data packet receiving module; if the current data packet is lost, the data packet retransmission module sends the data packet to the data packet receiving module Resend the current packet. 9. the low-cost aviation Ethernet implementation system based on Ethernet udp protocol according to claim 8, characterized in that: when the response receiving judgment module judges the packet loss retransmission mechanism, the time blocking mode is used to judge the data packet Whether it is lost, the data packet sending module sends the udp data packet to the server and waits for the server to send back a response. If the response receiving judgment module does not receive the server’s return response within the preset time, the data packet The resending module resends the current data packet to the server. 10. the low-cost aviation Ethernet implementation system based on Ethernet udp protocol according to claim 9, characterized in that: when the response receiving judgment module performs packet loss and retransmission mechanism judgment, it also includes, when adopting the time blocking mode After judging whether the data packet is lost, if the response reception judgment module receives the return response from the server within the preset time, continue to analyze the return response from the server, and detect the identification information carried by the current data packet, If it is inconsistent with the data packet identification information sent this time, the data packet resending module resends the current data packet to the server.

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