CN114244822A - Message transmission system and transmission method based on communication protocol - Google Patents
Message transmission system and transmission method based on communication protocol Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The application discloses message transmission system and message transmission method based on communication protocol, the message transmission system based on communication protocol includes equipment receiving terminal, equipment sending terminal and communication protocol, communication protocol is used for controlling message transmission and management between equipment receiving terminal and the equipment sending terminal, communication protocol includes application layer, transmission layer, network layer, link layer and physical layer, the application layer includes message sending trigger instruction and message transmission instruction, the equipment receiving terminal is used for sending message sending trigger instruction to the equipment sending terminal, the equipment sending terminal is used for carrying out the message after receiving the message trigger instruction that the equipment receiving terminal sent. Through the mode, the problems that in the traditional technology, the devices are inconvenient to integrate in low-end devices, the compatibility is poor, the safety is not high, the reliability is not high, and the real-time performance is poor are solved. Meanwhile, the protocol structure is simple and efficient, flexible, small in occupied bandwidth and capable of transmitting HEX and text data.
Description
Technical Field
The present application relates to the field of communications, and in particular, to a message transmission system and method based on a communication protocol.
Background
In the traffic field, most of existing inter-device communication protocols are low in safety degree and poor in communication reliability, are not friendly to low-end embedded devices (storage space and memory are high in occupation and integration difficulty), and along with popularization of the MaaS concept, the real-time requirement for data is gradually improved, meanwhile, financial payment also gradually relates to the traffic field, and the requirements for flexibility, safety and reliability of financial related data are higher.
Disclosure of Invention
The application mainly provides a message transmission system and a message transmission method based on a communication protocol, which are suitable for an inter-device communication protocol in the field of transportation travel and solve the problems that the inter-device is inconvenient to integrate in low-end devices, and the inter-device communication protocol is poor in compatibility, unsafe, unreliable and poor in real-time performance in the traditional technology. Meanwhile, the protocol structure is simple and efficient, flexible, small in occupied bandwidth and capable of transmitting HEX and text data.
In order to solve the technical problem, the application adopts a technical scheme that:
a message transmission system based on a communication protocol, characterized by: the device comprises a device receiving end, a device sending end and a communication protocol, wherein the communication protocol is used for controlling message transmission and management between the device receiving end and the device sending end, the communication protocol comprises an application layer, a transmission layer, a network layer, a link layer and a physical layer, the application layer comprises a message sending triggering instruction and a message transmission instruction,
the device receiving end is used for sending a message sending triggering instruction to the device sending end, and the device sending end is used for carrying out message after receiving the message triggering instruction sent by the device receiving end.
Preferably, the message sending triggering instruction includes a request online instruction, a message sending instruction, and a recovery instruction, where the request online instruction is used to request online message data, the message sending instruction is used to request the online message to be sent from a specified location, and the recovery instruction is used to request the recovery message.
Preferably, the application layer further comprises a message reception confirmation instruction, a transmission termination instruction, a rejection processing instruction, a connection instruction, a disconnection instruction,
the message receiving confirmation instruction is used for confirming after receiving the message, the transmission termination instruction is used for terminating the message transmission process, the connection instruction is used for establishing connection for the application layer, and the disconnection instruction is used for dismantling the connection between the application layers at the two ends.
Preferably, the transmission state of the receiving end of the device comprises a receiving end idle state, a receiving end receiving state and a ready-to-acknowledge state,
the receiving end idle state is used for converting the transmission state from the receiving end idle state to the receiving end receiving state after the equipment receiving end sends a message sending trigger instruction to the equipment sending end;
the receiving state of the equipment receiving end is used for converting into a ready-to-confirm state after the equipment receiving end receives the message transmission instruction, and is also used for converting into an idle state after receiving a rejection processing instruction or a transmission termination instruction;
the ready confirmation state is used for converting to the receiving end idle state if the data transmission is finished after the equipment receiving end sends the confirmation information to the equipment sending end, and converting to the receiving end receiving state if the data transmission is not finished, and is also used for converting the transmission state to the receiving end idle state if the equipment sending end sends a transmission termination instruction.
Preferably, the device sending end includes a sending end idle state, a sending end sending state, a waiting confirmation state,
the transmitting end idle state is used for converting into the transmitting end transmitting state after the device transmitting end receives a message transmitting trigger instruction of the device receiving end;
the sending end sending state is used for converting to a waiting confirmation state after the equipment sending end receives a message receiving confirmation instruction sent by the equipment receiving end, and is also used for converting to the sending end idle state after receiving a rejection processing instruction or a transmission termination instruction;
the confirmation state of the receiving end is used for converting to the idle state of the sending end when the transmission data is finished or the message receiving confirmation instruction count is not matched or a transmission termination instruction is received, and converting to the sending state of the sending end if the transmission data is not finished.
Preferably, the message format of the request presence instruction includes a protocol data unit length and a protocol data unit identifier,
the message format of the message sending instruction comprises a protocol data unit length, a protocol data unit identifier and a starting sequence number,
the message format of the recovery instruction comprises a protocol data unit length, a protocol data unit identifier, a starting sequence number and a starting number, the message transmission instruction comprises a protocol data unit length, a protocol data unit identifier, a data type identifier, an identification parameter and message data,
the message format of the message receipt acknowledgement command comprises a protocol data unit length, a protocol data unit identifier, a data type identification and an acknowledgement number,
the message format of the terminate transmission instruction includes a protocol data unit length, a protocol data unit identifier and a data type identification,
the message format of the rejection processing instruction comprises a protocol data unit length, a protocol data unit identifier, a data type identifier, a rejection reason, a confirmation identifier and a standby.
The technical scheme is that the message transmission method based on the communication protocol is provided, the method is that the equipment receiving end and the equipment sending end carry out message transmission based on the communication protocol, the message transmission comprises normal message transmission and abnormal message transmission,
the normal message transmission comprises the following steps: the equipment receiving end sends a message sending trigger instruction to the equipment sending end, the equipment receiving end and the equipment sending end respectively enter a receiving state and a sending state, the equipment sending end sends a message to the data sending end, the equipment receiving end sends a waiting confirmation instruction to the equipment sending end, and the equipment sending end enters an idle state after the message is transmitted;
the message sending triggering instruction comprises a request online instruction, a message sending instruction and a recovery instruction, wherein the request online instruction is used for requesting online message data, the message sending instruction is used for requesting the online message to be sent from a specified position, and the recovery instruction is used for requesting the recovery message.
Further, the abnormal message transmission comprises transmission of no available data, termination of transmission process, discontinuous termination of sequence number, termination of count mismatch and communication timeout.
Further, the device receiving end and the device sending end record a packet sequence number and a packet count for prompting whether message transmission is normal or not, the packet sequence number is synchronous with the packet count value when the message transmission is normal, and the packet sequence number is asynchronous with the packet count value when the message transmission is abnormal.
Further, when the message transmission is abnormal, the data receiving and sending are terminated, the equipment receiving end sends a message recovery instruction to the equipment sending end for message recovery, and if the message recovery is completed, the equipment receiving end and the equipment sending end enter an idle state; if the message is recovered to be abnormal, the equipment sending end sends a rejection processing instruction to the equipment receiving end, and after the equipment sending end receives the rejection processing instruction sent by the equipment receiving end, the equipment sending end and the equipment receiving end respectively carry out an idle state.
The beneficial effect of this application is: the method and the device solve the problems that in the prior art, devices are inconvenient to integrate in low-end devices, compatibility is poor, and the method and the device are unsafe, unreliable and poor in real-time performance. Meanwhile, the protocol structure is simple and efficient, flexible, small in occupied bandwidth and capable of transmitting HEX and text data.
Drawings
FIG. 1 is a schematic diagram of a communication protocol model of the present application;
FIG. 2 is a schematic diagram of the communication protocol architecture of the present application;
fig. 3 is a schematic diagram of three data transmission states at the sending end of the device;
FIG. 4 is a diagram illustrating three data transmission states at the receiving end of the device;
FIG. 5 is a schematic diagram of a normal data transfer process;
FIG. 6 is a schematic diagram of a no available data transmission process
FIG. 7 is a schematic representation of a termination of a transmission process;
FIG. 8 is a schematic diagram of sequence number discontinuous termination;
FIG. 9 is a schematic of count discontinuity matching;
FIG. 10 is a diagram of a device sender communication timeout;
FIG. 11 is a schematic diagram of a device receive end communication timeout;
FIG. 12 is a schematic diagram of data recovery;
fig. 13 is a diagram of denial of data recovery.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example of an embodiment
The invention provides a message transmission system based on a communication protocol, which is characterized in that: the device comprises a device receiving end, a device sending end and a communication protocol. As shown in fig. 1, the communication method proposed by the present invention is defined as S & MTP (Signal & Message transfer protocol), and the model of S & MTP protocol is: and the CDN node device A and the CDN node device B carry out message transmission through an S & MTP protocol. The invention regards the equipment (including service end, edge end, terminal, etc.) in the system as the end entity, the end is used as the concrete control object of the protocol, and realizes the protocol content in S & MTP. The method comprises key technical points such as sequence number reporting, packet counting, response, rejection and the like, maintains the communication state and the line state of the system, and realizes mechanisms such as sending, confirmation, breakpoint transmission, retransmission and the like.
The communication protocol is used for controlling message transmission and management between the device receiving end and the device sending end, and includes an application layer, a transport layer, a network layer, a link layer, and a physical layer, as shown in fig. 2. The S & MTP is in application layer, based on UDP/IP protocol, providing service for transmission and management of message data, and providing reliable and efficient means for transmission of message data; when the message data center finds that the transmitted data is lost or corrupted, recovery information may be sent to request this portion of data again.
The first embodiment:
the application layer has 9 message instructions:
1) s & MTP-CONNECT: establishing a connection for the application layer;
2) s & MTP-DISCONNECT: removing a connection between the application layers at the two ends;
3) s & MTP-POLL: requesting online message data;
4) s & MTP-REWIND: requesting the online message data to be transmitted from a specified position;
5) s & MTP-RECOVERY: requesting recovery of message data;
6) s & MTP-DATA: transmitting message data;
7) s & MTP-ACK: acknowledgement after receiving the message data;
8) s & MTP-RESET: terminating the message data transmission process;
9) s & MTP-REJECT: refuse to process the service;
wherein, S & MTP-POLL: requesting online message data; message format:
| BYTE 1 | |
| BYTE | |
| 2 | PDU length |
| BYTE 3 | PDU identifier |
S & MTP-REWIND: requesting online message data and starting to transmit from a specified position; message format:
| BYTE 1 | |
| BYTE | |
| 2 | PDU length |
| BYTE 3 | PDU identifier |
| BYTE 4 | Starting sequence number |
| BYTE 5 | Starting sequence number |
| BYTE 6 | Starting sequence number |
| BYTE 7 | Starting sequence number |
S & MTP-RECOVERY: requesting recovery of message data; message format:
s & MTP-DATA: transmitting message data; message format:
| BYTE 1 | |
| BYTE | |
| 2 | PDU length |
| BYTE 3 | PDU identifier |
| BYTE 4 | Data type identification |
| BYTE 5 | Identifying parameters |
| BYTE n | Message data |
S & MTP-ACK: acknowledgement after receiving the message data; message format:
| BYTE 1 | |
| BYTE | |
| 2 | PDU length |
| BYTE 3 | PDU identifier |
| BYTE 4 | Data type identification |
| BYTE 5 | Number of acknowledgements |
| BYTE 6 | Number of acknowledgements |
S & MTP-RESET terminates the message data transmission process; message format:
| BYTE 1 | |
| BYTE | |
| 2 | PDU length |
| BYTE 3 | PDU identifier |
| BYTE 4 | Data type identification |
S & MTP-REJECT: refuse to process the service; message format:
one embodiment is as follows:
the invention provides a message transmission system based on a communication protocol, wherein the communication protocol is used for controlling message transmission and management between a device receiving end and a device Sending end, the device Sending end, namely the A end, has three Data transmission states, namely an Idle State, a Data Sending State and a waiting acknowledgement State, and a State diagram is shown in figure 3.
1) In an idle state
In an idle state, the application program at the A end can receive and process a POLL, REWIND or RECOVERY request from the B end, and when the POLL, REWIND or RECOVERY request is received and processed, the transmission state is changed into a data sending state.
2) Data sending state
Under the state, the A end packs the online message data and uses PDU: DATA is transmitted to the B terminal; when the PDU: the state of DATA needing ACK or DATA transmission being completed is changed into a waiting confirmation state; meanwhile, if the A terminal sends a REJECT message or receives a RESET message at the moment, the state is changed into an idle state.
3) Wait for acknowledgement state
In this state, the a-side application waits for an acknowledgement message (ACK) from the B-side. After receiving the confirmation message, if the former DATA is the last group of DATA transmitted by the DATA or the ACK counts are not matched, the transmission state is changed into an idle state, otherwise, the state is changed into a DATA sending state, and the next group of DATA is continuously transmitted to the B terminal; if no acknowledgement is received after the timeout, the state also changes to an idle state.
The device receiving end, i.e. the B end, also has three data transmission states: an Idle State (Idle State), a Data Receiving State (Data Receiving State), and a Ready acknowledge State (Ready for Ack State), the State diagram is shown in fig. 4.
1) In an idle state
In an idle state, the application program at the B terminal can send a POLL, REWIND or RECOVERY request to the A terminal at regular time, and after the POLL, REWIND or RECOVERY request is sent, the transmission state is changed into a data receiving state.
2) Data receiving state
In this state, the B-side continuously receives DATA packets. When the PDU: the DATA needs ACK or the transmission state is changed into a ready confirmation state when the DATA transmission is finished; meanwhile, if the B terminal sends a RESET message or receives a REJECT message at the moment, the state is changed into an idle state.
3) Ready to confirm state
In this state, the B-side application prepares an acknowledgement message (ACK) to the a-side. After sending the confirmation message, if the previous DATA is the Last group of DATA transmitted by the current DATA, namely the DATA has a DATA end mark (Last DATA Indication), the transmission state is changed into an idle state, otherwise, the transmission state is changed into a DATA receiving state, and the next group of DATA from the A end is continuously received; if the B end finds that the sequence number is not continuous, the B end sends a RESET message and the state is changed into an idle state.
Second embodiment:
the invention also provides a technical scheme, namely a message transmission method based on the communication protocol, which is characterized in that the message transmission is carried out between the receiving end of the device and the sending end of the device based on the communication protocol, the message transmission comprises normal message transmission and abnormal message transmission,
the normal message transmission steps are shown in fig. 5, and include: the equipment receiving end sends a message sending trigger instruction to the equipment sending end, the equipment receiving end and the equipment sending end respectively enter a receiving state and a sending state, the equipment sending end sends a message to the data sending end, the equipment receiving end sends a waiting confirmation instruction to the equipment sending end, and the equipment sending end enters an idle state after the message is transmitted;
the message sending triggering instruction comprises a request online instruction, a message sending instruction and a recovery instruction, wherein the request online instruction is used for requesting online message data, the message sending instruction is used for requesting the online message to be sent from a specified position, and the recovery instruction is used for requesting the recovery message.
Further, the abnormal message transmission includes transmission of no available data as shown in fig. 6, termination of transmission process as shown in fig. 7, discontinuous termination of sequence number as shown in fig. 8, termination of count mismatch as shown in fig. 9, communication timeout as shown in fig. 10 (communication timeout at device transmitting end) and fig. 11 (communication timeout at device receiving end).
Further, the device receiving end and the device sending end record a packet sequence number and a packet count for prompting whether message transmission is normal or not, the packet sequence number is synchronous with the packet count value when the message transmission is normal, and the packet sequence number is asynchronous with the packet count value when the message transmission is abnormal.
Further, when the message transmission is abnormal, the data transmission and reception are terminated, the device receiving end sends a message recovery instruction to the device sending end for message recovery, as shown in fig. 12, if the message recovery is completed, the device receiving end and the device sending end enter an idle state; if the message is recovered to be abnormal, the device sending end sends a rejection processing instruction to the device receiving end, and after the device sending end receives the rejection processing instruction sent by the device receiving end, the device sending end and the device receiving end respectively perform an idle state, as shown in fig. 13.
In the actual communication process, the data transmission process and abnormal conditions of both communication parties are initiated by a POLL, REWIND or RECOVERY instruction, and both communication parties are responsible for recording a packet sequence number (BSN) and a packet Count (CNT); when there is no abnormality, the BSN and CNT values are synchronous, and the BSN and CNT values caused by the abnormality are asynchronous, the data receiving and transmitting process is terminated; the interrupted data can be subsequently restored via the RECOVERY instruction.
The above embodiments are merely examples, and not intended to limit the scope of the present application, and all modifications, equivalents, and flow charts using the contents of the specification and drawings of the present application, or those directly or indirectly applied to other related arts, are included in the scope of the present application.
Claims (10)
1. A message transmission system based on a communication protocol, characterized by: the device comprises a device receiving end, a device sending end and a communication protocol, wherein the communication protocol is used for controlling message transmission and management between the device receiving end and the device sending end, the communication protocol comprises an application layer, a transmission layer, a network layer, a link layer and a physical layer, the application layer comprises a message sending triggering instruction and a message transmission instruction,
the device receiving end is used for sending a message sending triggering instruction to the device sending end, and the device sending end is used for carrying out message after receiving the message triggering instruction sent by the device receiving end.
2. The communication protocol based message transmission system according to claim 1, wherein: the message sending triggering instruction comprises a request online instruction, a message sending instruction and a recovery instruction, wherein the request online instruction is used for requesting online message data, the message sending instruction is used for requesting the online message to be sent from a specified position, and the recovery instruction is used for requesting the recovery message.
3. The communication protocol based message transmission system according to claim 2, wherein: the application layer also comprises a message receiving confirmation instruction, a transmission termination instruction, a processing rejection instruction, a connection instruction and a disconnection instruction,
the message receiving confirmation instruction is used for confirming after receiving the message, the transmission termination instruction is used for terminating the message transmission process, the connection instruction is used for establishing connection for the application layer, and the disconnection instruction is used for dismantling the connection between the application layers at the two ends.
4. A messaging system based on a communication protocol according to claim 3, characterized in that: the transmission state of the receiving end of the device comprises a receiving end idle state, a receiving end receiving state and a ready confirmation state,
the receiving end idle state is used for converting the transmission state from the receiving end idle state to the receiving end receiving state after the equipment receiving end sends a message sending trigger instruction to the equipment sending end;
the receiving state of the equipment receiving end is used for converting into a ready-to-confirm state after the equipment receiving end receives the message transmission instruction, and is also used for converting into an idle state after receiving a rejection processing instruction or a transmission termination instruction;
the ready confirmation state is used for converting to the receiving end idle state if the data transmission is finished after the equipment receiving end sends the confirmation information to the equipment sending end, and converting to the receiving end receiving state if the data transmission is not finished, and is also used for converting the transmission state to the receiving end idle state if the equipment sending end sends a transmission termination instruction.
5. A messaging system based on a communication protocol according to claim 3, characterized in that: the device sending end comprises a sending end idle state, a sending end sending state and a waiting confirmation state,
the transmitting end idle state is used for converting into the transmitting end transmitting state after the device transmitting end receives a message transmitting trigger instruction of the device receiving end;
the sending end sending state is used for converting to a waiting confirmation state after the equipment sending end receives a message receiving confirmation instruction sent by the equipment receiving end, and is also used for converting to the sending end idle state after receiving a rejection processing instruction or a transmission termination instruction;
the confirmation state of the receiving end is used for converting to the idle state of the sending end when the transmission data is finished or the message receiving confirmation instruction count is not matched or a transmission termination instruction is received, and converting to the sending state of the sending end if the transmission data is not finished.
6. A messaging system based on a communication protocol according to claim 3, characterized in that: the message format of the request presence instruction includes a protocol data unit length and a protocol data unit identifier,
the message format of the message sending instruction comprises a protocol data unit length, a protocol data unit identifier and a starting sequence number,
the message format of the recovery instruction comprises a protocol data unit length, a protocol data unit identifier, a starting sequence number and a starting number, the message transmission instruction comprises a protocol data unit length, a protocol data unit identifier, a data type identifier, an identification parameter and message data,
the message format of the message receipt acknowledgement command comprises a protocol data unit length, a protocol data unit identifier, a data type identification and an acknowledgement number,
the message format of the terminate transmission instruction includes a protocol data unit length, a protocol data unit identifier and a data type identification,
the message format of the rejection processing instruction comprises a protocol data unit length, a protocol data unit identifier, a data type identifier, a rejection reason, a confirmation identifier and a standby.
7. A message transmission method based on a communication protocol, characterized by: the equipment receiving end and the equipment sending end carry out message transmission based on a communication protocol, the message transmission comprises normal message transmission and abnormal message transmission,
the normal message transmission comprises the following steps: the equipment receiving end sends a message sending trigger instruction to the equipment sending end, the equipment receiving end and the equipment sending end respectively enter a receiving state and a sending state, the equipment sending end sends a message to the data sending end, the equipment receiving end sends a waiting confirmation instruction to the equipment sending end, and the equipment sending end enters an idle state after the message is transmitted;
the message sending triggering instruction comprises a request online instruction, a message sending instruction and a recovery instruction, wherein the request online instruction is used for requesting online message data, the message sending instruction is used for requesting the online message to be sent from a specified position, and the recovery instruction is used for requesting the recovery message.
8. The message transmission method based on communication protocol according to claim 7, characterized in that: the abnormal message transmission comprises transmission of no available data, termination of a transmission process, discontinuous termination of sequence numbers, termination of count mismatching and communication timeout.
9. The message transmission method based on the communication protocol as claimed in claim 8, wherein: the equipment receiving end and the equipment sending end record a packet serial number and a packet count and are used for prompting whether message transmission is normal or not, the packet serial number is synchronous with the packet count value when the message transmission is normal, and the packet serial number is asynchronous with the packet count value when the message transmission is abnormal.
10. The message transmission method based on the communication protocol according to claim 9, characterized in that: when the message transmission is abnormal, the data receiving and sending are terminated, the equipment receiving end sends a message recovery instruction to the equipment sending end for message recovery, and if the message recovery is completed, the equipment receiving end and the equipment sending end enter an idle state; if the message is recovered to be abnormal, the equipment sending end sends a rejection processing instruction to the equipment receiving end, and after the equipment sending end receives the rejection processing instruction sent by the equipment receiving end, the equipment sending end and the equipment receiving end respectively carry out an idle state.
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