CN106850537B - Method for realizing RSSP-I railway signal safety communication protocol - Google Patents
Method for realizing RSSP-I railway signal safety communication protocol Download PDFInfo
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Abstract
The invention provides a method for realizing RSSP-I railway signal safety communication protocol, which utilizes object-oriented C + + programming language to encapsulate a protocol class HH _ RSSP _ I and a pure virtual class DataInterface which is responsible for data processing, wherein the HH _ RSSP _ I class is responsible for establishing and maintaining the safety communication protocol, and the DataInterface class is responsible for receiving and sending bottom layer data and processing service data. Pure imaginary functions SendData, receData and PushData in the DataInterface class need to be realized by a user in combination with the actual software and hardware environment of the user, after the realization, the object is transmitted into the HH _ RSSP _ I class through the Init (DataInterface pDI) in the HH _ RSSP _ I through an instantiation object, and the protocol class HH _ RSSP _ I and the DataInterface of the data processing class are linked and operated by the method. The implementation method has the advantages of good universality, high stability and clear structure.
Description
Technical Field
The invention relates to a method for realizing a secure communication protocol, in particular to a method for realizing a RSSP-I railway signal secure communication protocol.
Background
The train operation control system is an important component of a high-speed railway signal system. The CTCS-2 level train operation control system is a train-ground integrated train operation control system. Due to the fact that the running speed of the motor train unit train is high, requirements on data timeliness, data integrity, data packet sequence and data accuracy of communication between devices in the train control system are high. The RSSP-I railway signal safety communication protocol is designed aiming at the possible problems of train signal communication and can meet the communication control requirements.
In most railway train control systems, the implementation of the RSSP-I railway signal safety communication protocol is tightly combined with the railway train control systems, a unified interface does not exist, and when a communication mode (such as CAN communication is changed into RS422 communication) or a service data protocol is changed, the implementation method of the whole protocol is changed, so that the implementation of the safety protocol becomes complicated, and the repeated workload is large.
In order to solve the above problems, people are always seeking an ideal technical solution.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, thereby providing a method for realizing the RSSP-I railway signal safety communication protocol, and solving the problems of complex safety protocol realization process and large repeated development amount.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for realizing RSSP-I railway signal safety communication protocol comprises the following steps:
step 1, a data sending end and a data receiving end respectively package a protocol class HH _ RSSP _ I and a user interface class DataInterface, and a secure communication protocol initialization function Init, a link establishment and maintenance function DoReceWork, a reconnection request function SendSSE and a reestablishment link response function SendSSR are packaged in the HH _ RSSP _ I; a bottom layer is packaged in a DataInterface class to receive pure virtual function receData, send pure virtual function SendData and process pure virtual function PushData;
step 2, the HH _ RSSP _ I class of the data sending end calls a bottom layer to send a pure virtual function SendData to send original data;
step 3, the bottom layer of the data receiving end receives pure imaginary function receData to receive original data;
and 4, the data receiving end transmits the original data to an HH _ RSSP _ I class, the HH _ RSSP _ I class judges whether the original data is lost, complete, time-efficient and correct or not by analyzing check bits and time stamp marks in the original data, and if the original data is complete, time-efficient and correct, the business data in the original data is stripped and transmitted to a business data processing function in a DataInterface class for processing.
Based on the above, the specific steps of step 4 are:
step 4.1, defining a DataInterface object DataInterface DI by the DataInterface class of the data receiving end, calling an initialization function Init by the HH _ RSSP _ I class, and transmitting the DataInterface DI into the HH _ RSSP _ I class;
step 4.2, the data receiving end establishes and maintains the function DoReceWork function and establishes the safe protocol link with the data sending end through calling the link;
4.3, the data receiving end calls a bottom layer receiving pure imaginary function receData to receive the original data and judges the type of the original data, and if the type of the original data is the reconnection request response data SSR, the step 4.3 is executed in a circulating mode; if the type of the original data is the reconnect request data SSE, directly executing the step 4.4; if the type of the original data is the service processing data RSD, directly executing the step 4.5;
step 4.4, the data receiving end calls a reconstructed link response function SendSSR and a data transmitting end to reconstruct a link response, and the data transmitting end calls a bottom layer to transmit a pure virtual function SendData to retransmit the original data;
step 4.5, the data receiving end checks the original data, if correct, continue to judge whether the frame number of the original data is continuous, whether the sequence of the frame number is disordered, if the frame number is continuous and the sequence of the frame number is correct, call the pure virtual function pushData of the service data processing to process the incoming original data; if the check error or the frame number is discontinuous or the sequence of the frame number is disordered, the reconnect request function SendSSE is called to reestablish the link relation with the data sending end, and the data sending end sends the pure virtual function SendData to resend the original data by calling the bottom layer.
Based on the above, the SSE data and the SSR data include handshake information such as heartbeat, timestamp, and frame number required for reconstructing a secure communication protocol.
Compared with the prior art, the invention has outstanding substantive characteristics and remarkable progress, and particularly, the invention comprises two classes called by an upper layer and a lower layer, namely a protocol processing class HH-RSSP-I and a data processing class DataInterface, so that the universality of the realization of a secure communication protocol is realized; when the user realizes the safe communication protocol, the SendData function is realized only by combining with an actual communication mode (CAN or RS422 or other modes), and the ReceData function and the PushData function are realized by combining with an actual data protocol format, so that the method has the advantages of good universality, high stability and clear structure.
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FIG. 1 is a schematic flow chart of step 4 of the present invention.
Detailed Description
The technical solution of the present invention is further described in detail by the following embodiments.
A method for realizing RSSP-I railway signal safety communication protocol comprises the following steps:
step 1, a data sending end and a data receiving end respectively adopt an object-oriented C + + programming language to package two classes, namely an HH-RSSP-I class responsible for security protocol processing and a DataInterface class responsible for data processing; meanwhile, a secure communication protocol initialization function Init, a link establishment and maintenance function DoReceWork, a reconnection request function SendSSE and a reestablishment link response function SendSSR are encapsulated in the HH-RSSP-I class; the data interface class is encapsulated with a bottom layer receiving pure virtual function receData, a bottom layer sending pure virtual function SendData and a business data processing pure virtual function PushData;
step 2, the HH _ RSSP _ I class of the data sending end calls a bottom layer to send a pure virtual function SendData to send original data;
step 3, the bottom layer of the data receiving end receives pure imaginary function receData to receive original data;
and 4, the data receiving end transmits the original data to an HH _ RSSP _ I class, the HH _ RSSP _ I class judges whether the original data is lost, complete, time-efficient and correct or not by analyzing check bits and time stamp marks in the original data, and if the original data is complete, time-efficient and correct, the business data in the original data is stripped and transmitted to a business data processing function in a DataInterface class for processing.
When the method is adopted to realize the RSSP-I railway signal safety communication protocol, only three pure virtual functions in the DataInterface class need to be realized.
When the data sending end needs to send data, the data is transmitted to the DataInterface class through the HH _ RSSP _ I class and is sent out.
As shown in fig. 1, the specific steps of step 4 are:
step 4.1, defining a DataInterface object DataInterface DI by the DataInterface class of the data receiving end, calling an initialization function Init by the HH _ RSSP _ I class, and transmitting the DataInterface DI into the HH _ RSSP _ I class;
step 4.2, the data receiving end establishes and maintains the function DoReceWork function and establishes the safe protocol link with the data sending end through calling the link;
4.3, the data receiving end calls a bottom layer receiving pure imaginary function receData to receive the original data and judges the type of the original data, and if the type of the original data is the reconnection request response data SSR, the step 4.3 is executed in a circulating mode; if the type of the original data is the reconnect request data SSE, directly executing the step 4.4; if the type of the original data is the service processing data RSD, directly executing the step 4.5;
step 4.4, the data receiving end calls a reconstructed link response function SendSSR and a data transmitting end to reconstruct a link response, and the data transmitting end calls a bottom layer to transmit a pure virtual function SendData to retransmit the original data;
step 4.5, the data receiving end checks the original data, if correct, continue to judge whether the frame number of the original data is continuous, whether the sequence of the frame number is disordered, if the frame number is continuous and the sequence of the frame number is correct, call the pure virtual function pushData of the service data processing to process the incoming original data; if the check error or the frame number is discontinuous or the sequence of the frame number is disordered, the reconnect request function SendSSE is called to reestablish the link relation with the data sending end, and the data sending end sends the pure virtual function SendData to resend the original data by calling the bottom layer.
In the operation process of the system, if any end of the RSSP-I railway signal safety communication protocol finds that the original data packet has the conditions that the check error, the frame number is discontinuous, the sequence of the frame number is disordered and the like, and the data can not be ensured to be complete and correct, a SendSSE () function is immediately called to send the SSE data of a reconstruction protocol link request, after the SSE data is received by the other end of the RSSP-I railway signal safety communication protocol, SendSSR () function is immediately called to send and receive the SSR data of the reconstruction protocol link, and as the SSE data and the SSR data contain handshake information such as heartbeat, timestamp, frame number and the like required by the reconstruction safety communication protocol, the safety communication protocol can be re-linked after mutual exchange. The RSD is the type of effective service data frame sent by both ends of the protocol under the condition that the protocol is normally linked.
Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (2)
1. A method for realizing RSSP-I railway signal safety communication protocol is characterized by comprising the following steps:
step 1, a data sending end and a data receiving end respectively package a protocol class HH _ RSSP _ I and a user interface class DataInterface, and a secure communication protocol initialization function Init, a link establishment and maintenance function DoReceWork, a reconnection request function SendSSE and a reestablishment link response function SendSSR are packaged in the HH _ RSSP _ I; a bottom layer is packaged in a DataInterface class to receive pure virtual function receData, send pure virtual function SendData and process pure virtual function PushData;
step 2, the HH _ RSSP _ I class of the data sending end calls a bottom layer to send a pure virtual function SendData to send original data;
step 3, the bottom layer of the data receiving end receives pure imaginary function receData to receive original data;
step 4, the data receiving end transmits the original data to an HH _ RSSP _ I class, the HH _ RSSP _ I class judges whether the original data is lost, complete, time-efficient or correct by analyzing check bits and time stamp marks in the original data, if the original data is complete, time-efficient and correct, the service data in the original data is stripped and transmitted to a service data processing function in a DataInterface class for processing;
step 4.1, defining a DataInterface object DataInterface DI by the DataInterface class of the data receiving end, calling an initialization function Init by the HH _ RSSP _ I class, and transmitting the DataInterface DI into the HH _ RSSP _ I class;
step 4.2, the data receiving end establishes and maintains the function DoReceWork function and establishes the safe protocol link with the data sending end through calling the link;
4.3, the data receiving end calls a bottom layer receiving pure imaginary function receData to receive the original data and judges the type of the original data, and if the type of the original data is the reconnection request response data SSR, the step 4.3 is executed in a circulating mode; if the type of the original data is the reconnect request data SSE, directly executing the step 4.4; if the type of the original data is the service processing data RSD, directly executing the step 4.5;
step 4.4, the data receiving end calls a reconstructed link response function SendSSR and a data transmitting end to reconstruct a link response, and the data transmitting end calls a bottom layer to transmit a pure virtual function SendData to retransmit the original data;
step 4.5, the data receiving end checks the original data, if correct, continue to judge whether the frame number of the original data is continuous, whether the sequence of the frame number is disordered, if the frame number is continuous and the sequence of the frame number is correct, call the pure virtual function pushData of the service data processing to process the incoming original data; if the check error or the frame number is discontinuous or the sequence of the frame number is disordered, the reconnect request function SendSSE is called to reestablish the link relation with the data sending end, and the data sending end sends the pure virtual function SendData to resend the original data by calling the bottom layer.
2. The method of claim 1 for implementing a RSSP-I railway signal secure communication protocol, wherein: the SSE data and the SSR data comprise heartbeat, timestamp and frame sequence number handshake information required by a reestablishment secure communication protocol.
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