JP4652300B2 - Transmitter, receiver, program, and communication method - Google Patents

Description

  The present invention relates to a transmitter or the like that repeatedly transmits a packet having an ID part and a data part, in which transmission data having the same content is stored in the data part.

  An electronic code (which means a packet. Since the term “electronic message” is common in the field of railways, it is hereinafter referred to as “electronic message”) has an identification code (ID) for identifying the source and destination of the electronic message. Is generally stored and transmitted. The same applies to railway systems such as ATS and ATC transmission systems.

  However, in railway systems, etc., the same contents of telegrams should be used for the purpose of ensuring that telegrams are sent and received by communication using proximity communication and track circuits, and that equipment failures are prevented from becoming latent. Continue to transmit repeatedly. And when the message content is changed, the message of the changed content is repeatedly transmitted.

  Specifically, in an automatic train control (ATC) system (for example, Patent Document 1), an identification code of the track circuit and a blockage section where a preceding train is on the track circuit provided for each block section. A message storing information such as the number of open sections is repeatedly transmitted.

The train receives a message from the track circuit in the blocked section while passing through the blocked section, and controls the operation of the brake according to the brake pattern generated based on the received message, thereby realizing vehicle speed control. .
JP 2004-80912 A

  In a transmission system represented by an automatic train control system, higher reliability of transmission is required in order to realize safe operation of the railway. This includes verification capabilities for error messages such as how to verify a message in which a bit error has occurred due to noise or the like (hereinafter referred to as an “error message”) and not to use an error message. Improvement is an unavoidable issue.

  However, in the conventional transmission system, since the identification code stored in the message does not change for each message, the number of bits changing for each message is small, and the Hamming distance between each message tends to be small. For this reason, depending on the generated bit error, it can be interpreted as a correct electronic message, and therefore, an event similar to the so-called “spoofing” of a device in which the correctness of the electronic message cannot be determined (hereinafter referred to as “electronic message impersonation”) may occur. There was a big barrier to improving the verification capability against error messages.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to improve the verification capability against an error message by reducing the possibility of occurrence of message spoofing.

The first invention for solving the above problems is:
A packet (for example, a telegram in FIG. 18) having an ID portion (for example, the transmission source ID portion in FIG. 18) and a data portion (for example, the data portion in FIG. 18), and transmission data having the same content in the data portion. A transmitter that repeatedly transmits stored packets (for example, the signal handling station control device 70 of FIG. 17),
Storage means (for example, storage unit 720 in FIG. 17; operation command-specific circulation sequence data 723) that stores a numerical sequence defined for each ID capable of identifying an ID with two or more consecutive numerical values;
ID selection means (for example, the processing unit 700 in FIG. 17; step C9 in FIG. 22) for selecting an ID alternatively from the plurality of IDs;
A numerical value that newly selects a numerical value constituting a numerical value sequence corresponding to the selected ID among the numerical value sequences stored in the storage means each time a packet is transmitted in the order of the numerical value sequence. Selection means (for example, the processing unit 700 in FIG. 17; steps C11 and C13 in FIG. 22);
Each time a packet is transmitted, a numerical value newly selected by the numerical value selection means is stored in the ID part, and a transmission means for repeatedly transmitting a packet in which transmission data of the same content is stored in the data part (for example, FIG. Processing unit 700; step C15 in FIG. 22;
It is a transmitter provided with.

As another invention,
A packet having an ID part and a data part in a computer having a storage means and a communication means for storing a numerical string defined for each ID capable of identifying an ID by two or more consecutive numerical values. There is a program for repeatedly transmitting packets storing transmission data of the same content in the data portion,
ID selection means for selecting an ID alternatively from the plurality of IDs;
A numerical value that newly selects a numerical value constituting a numerical value sequence corresponding to the selected ID among the numerical value sequences stored in the storage means each time a packet is transmitted in the order of the numerical value sequence. Selection means,
A transmission means for storing a numerical value newly selected by the numerical value selection means every time a packet is transmitted in the ID part, and repeatedly transmitting a packet in which transmission data of the same content is stored in the data part,
A program for causing the computer to function (for example, the signal processing program 721 in FIG. 17) may be configured.

  According to the first invention, etc., a numerical sequence defined for each ID that can identify an ID by two or more consecutive numerical values is stored, and can be selected from a plurality of IDs. The numerical value constituting the numerical sequence corresponding to the ID selected in (1) is newly selected every time a packet is transmitted in the order of the numerical sequence. A newly selected numerical value is stored in the ID part, and a packet in which transmission data having the same content is stored in the data part is repeatedly transmitted.

  Since a unique numerical sequence is defined for each ID, the order of numerical values stored in the ID portion of a packet that is repeatedly transmitted changes according to its own rule for each ID. In addition, since the numerical value stored in the ID part changes for each packet, the Hamming distance between the packets increases. Therefore, the possibility of occurrence of message spoofing is reduced, and the verification capability for an error message can be improved.

As a second invention,
A transmitter having an ID part and a data part, wherein the transmitter repeatedly transmits a packet storing transmission data of the same content in the data part,
Storage means for storing a numerical string defined for each ID capable of identifying the ID with two or more consecutive numerical values;
ID selection means for alternatively selecting an ID from the plurality of IDs;
Each time a packet is transmitted, a predetermined number of numerical values that are consecutive in the numerical value sequence among the numerical values corresponding to the selected ID among the numerical value sequences stored in the storage means are transmitted. A numerical selection means to be newly selected;
Transmission in which the predetermined number of numerical values newly selected by the numerical value selection means is stored in the ID part in the selection order every time a packet is transmitted, and packets having the same content stored in the data part are repeatedly transmitted. Means,
You may comprise the transmitter provided with.

As another invention,
A packet having an ID part and a data part in a computer having a storage means and a communication means for storing a numerical string defined for each ID capable of identifying an ID by two or more consecutive numerical values. There is a program for repeatedly transmitting packets storing transmission data of the same content in the data portion,
ID selection means for selecting an ID alternatively from the plurality of IDs;
Each time a packet is transmitted, a predetermined number of numerical values that are consecutive in the numerical value sequence among the numerical values corresponding to the selected ID among the numerical value sequences stored in the storage means are transmitted. Numerical value selection means to be newly selected,
Transmission in which the predetermined number of numerical values newly selected by the numerical value selection means is stored in the ID part in the selection order every time a packet is transmitted, and packets having the same content stored in the data part are repeatedly transmitted. means,
A program for causing the computer to function may be configured.

  According to the second invention, etc., a numerical value sequence defined for each ID capable of identifying an ID by two or more consecutive numerical values is stored, and can be selected from a plurality of IDs. Each time a packet is transmitted, a predetermined number of numerical values that are consecutive in the numerical value sequence are newly selected from the numerical values constituting the numerical value sequence corresponding to the selected ID. A predetermined number of numerical values to be newly selected are stored in the ID part in the order of selection, and packets in which transmission data having the same contents are stored in the data part are repeatedly transmitted.

  Therefore, the same effect as in the first invention is exhibited, and when two or more numerical values are selected and stored in the packet ID part, the receiving side specifies the ID by receiving the packet once. It becomes possible.

Further, as a third invention, the transmitter of the second invention,
Each time the numerical value selection means transmits a packet by a predetermined number in the order of numerical values constituting the numerical value sequence from the numerical values constituting the numerical value sequence corresponding to the ID selected by the ID selecting means. A transmitter to be selected may be configured.

  According to the third aspect of the present invention, a new number is newly added each time a packet is transmitted in the order of the numerical value constituting the numerical value sequence from the numerical value value corresponding to the selected ID. Selected. Accordingly, a packet in which the determined number of numerical values is stored in the ID part is repeatedly transmitted.

As a fourth invention, a transmitter according to the third invention,
A transmitter for selecting a numerical value may be configured so that the numerical value selecting means selects a part of a predetermined number of numerical values selected last time.

  According to the fourth aspect of the invention, the numerical values are selected such that some of the predetermined numerical values selected last time overlap this time.

As a fifth invention,
A packet having an ID part (for example, the transmission source ID part in FIG. 18) and a data part (for example, the data part in FIG. 18), and having the same transmission data stored in the data part and repeatedly transmitted (for example, , A receiver (for example, the signal control device 80 in FIG. 17) that receives the transmission source ID portion in FIG.
Storage means (for example, the storage unit 820 in FIG. 17; number-of-operations sequence data 723 in FIG. 17) that stores a numerical sequence defined for each ID that can identify an ID with two or more consecutive numerical values;
The numerical value stored in the ID part of the continuously received packet and the order of reception are compared with each of a plurality of numerical values stored in the storage unit, and the numerical value sequence including the numerical value is corresponding to the order. ID specifying means (for example, the control unit 800 in FIG. 17; step D33 in FIG. 23) for specifying the ID to be performed;
You may comprise the receiver provided with.

As another invention, a computer having a storage means and a communication means for storing a numerical string defined for each ID capable of identifying an ID by two or more consecutive numerical values, an ID section and data A program for receiving a packet repeatedly transmitted with the same content of transmission data stored in the data portion,
The numerical value stored in the ID part of the continuously received packet and the order of reception are compared with each of a plurality of numerical values stored in the storage unit, and the numerical value sequence including the numerical value is corresponding to the order. A program (for example, the signal control program 821 in FIG. 17) for causing the computer to function as ID specifying means for specifying the ID to be performed may be configured.

  According to the fifth invention and the like, a numerical sequence defined for each ID capable of identifying an ID by two or more continuous numerical values is stored, and an ID portion of a packet received continuously The numerical values stored in and the received order are checked against each of a plurality of stored numerical sequences, whereby the ID corresponding to the numerical sequence including the numerical values is specified in the order. Therefore, the ID can be specified by receiving two or more consecutive packets.

As a sixth invention,
A receiver having an ID part and a data part, receiving a packet in which transmission data of the same content is stored in the data part and repeatedly transmitted;
Storage means for storing a numerical string defined for each ID capable of identifying the ID with two or more consecutive numerical values;
A plurality of numerical values stored in the ID part of the received packet and their order are compared with each of the plurality of numerical values stored in the storage means, and an ID corresponding to the numerical value string including the numerical values in that order. ID specifying means for specifying
You may comprise the receiver provided with.

As another invention,
A computer having a storage means and a communication means for storing a numerical value sequence defined for each ID capable of identifying an ID by two or more consecutive numerical values, has an ID part and a data part, A program for receiving a packet repeatedly transmitted with the same content of transmission data stored in the data portion,
A plurality of numerical values stored in the ID part of the received packet and their order are compared with each of the plurality of numerical values stored in the storage means, and an ID corresponding to the numerical value string including the numerical values in that order. A program for causing the computer to function as ID specifying means for specifying the ID may be configured.

  According to the sixth invention, etc., a numerical sequence defined for each ID that can identify an ID by two or more consecutive numerical values is stored and stored in the ID portion of the received packet. The plurality of numerical values and the order thereof are compared with each of the stored plurality of numerical sequences, whereby the ID corresponding to the numerical sequence including the numerical values in the order is specified. Therefore, it is possible to specify an ID by receiving one packet.

Further, as a seventh invention, the receiver of the sixth invention,
When each ID specified by the ID specifying means based on each successively received packet is the same ID, a predetermined process is performed on transmission data stored in the data portion of the received packet Data processing means (for example, control unit 800 in FIG. 17; step D35 in FIG. 23);
You may comprise the receiver provided with.

  According to the seventh aspect, when the IDs identified based on the continuously received packets are the same ID, the predetermined transmission data stored in the data portion of the received packet is determined. The process is executed.

As a twelfth invention,
A communication method in which a transmitter is a packet having an ID part and a data part, repeatedly transmits a packet in which transmission data having the same content is stored in the data part, and a receiver receives the transmitted packet. Because
An ID selection step in which the transmitter selectively selects an ID from a plurality of predetermined IDs;
A numerical value constituting a numerical value sequence corresponding to the selected ID among the numerical value sequences defined for each of the plurality of IDs capable of identifying the ID by two or more consecutive numerical values. A numerical value selection step for newly selecting each time a packet is transmitted in the order of the numerical value sequence;
A transmitter stores a numerical value newly selected by the numerical value selection step every time a packet is transmitted in the ID part, and repeatedly transmits a packet in which transmission data of the same content is stored in the data part;
The receiver checks the numerical value stored in the ID part of the continuously received packets and the order of reception with each of the plurality of defined numerical sequences, and corresponds to the numerical sequence including the numerical values in the order. An ID specifying step for specifying an ID to be performed;
A communication method including the above may be configured.

  According to the twelfth aspect of the present invention, the transmitter is alternatively selected from among a numerical string defined for each of a plurality of IDs capable of identifying the ID by two or more consecutive numerical values. A numerical value constituting a numerical sequence corresponding to the ID is newly selected every time a packet is transmitted in the order of the numerical sequence. A newly selected numerical value is stored in the ID part, and a packet in which transmission data having the same content is stored in the data part is repeatedly transmitted.

  In addition, the receiver stores the numerical values stored in the ID part of the continuously received packets and the order of reception with each of a plurality of predefined numerical sequences so that the numerical values are included in the order. An ID corresponding to the numeric string is specified.

As a thirteenth invention,
A communication method in which a transmitter is a packet having an ID part and a data part, repeatedly transmits a packet in which transmission data having the same content is stored in the data part, and a receiver receives the transmitted packet. Because
An ID selection step in which the transmitter selectively selects an ID from a plurality of predetermined IDs;
Among the numerical values constituting the numerical value sequence corresponding to the selected ID among the numerical value sequences defined for each of the plurality of IDs, in which the transmitter can identify the ID with two or more consecutive numerical values. A numerical value selection step for newly selecting a predetermined number of numerical values consecutive in the order of the numerical value sequence each time a packet is transmitted;
The transmitter stores the predetermined number of numerical values newly selected by the numerical value selection step every time a packet is transmitted in the ID part in the order of selection, and a packet in which transmission data of the same content is stored in the data part. A sending step for sending repeatedly;
The receiver checks the plurality of numerical values stored in the ID part of the received packet and the order thereof with each of the plurality of defined numerical sequences, and the ID corresponding to the numerical sequence including the numerical values in the order. ID identifying step for identifying
A communication method including the above may be configured.

  According to the thirteenth aspect, the transmitter is alternatively selected from among a numerical string defined for each of a plurality of IDs that can identify the ID by two or more consecutive numerical values. A predetermined number of numerical values that are consecutive in the numerical value sequence are newly selected from the numerical values constituting the numerical value sequence corresponding to the ID every time a packet is transmitted. A predetermined number of numerical values to be newly selected are stored in the ID part in the order of selection, and packets in which transmission data having the same contents are stored in the data part are repeatedly transmitted.

  In addition, a plurality of numerical values stored in the ID part of the received packet and their order are checked against each of a plurality of predefined numerical sequences by the receiver, whereby a numerical sequence including the numerical values in the order. ID corresponding to is identified.

  According to the present invention, a numerical sequence defined for each ID that can identify an ID with two or more consecutive numerical values is stored, and is selected alternatively from a plurality of IDs A numerical value constituting a numerical sequence corresponding to the ID is newly selected every time a packet is transmitted in the order of the numerical sequence. A newly selected numerical value is stored in the ID part, and a packet in which transmission data having the same content is stored in the data part is repeatedly transmitted.

  Since a unique numerical sequence is defined for each ID, the order of numerical values stored in the ID portion of a packet that is repeatedly transmitted changes according to its own rule for each ID. In addition, since the numerical value stored in the ID part changes for each packet, the Hamming distance between the packets increases. Therefore, the possibility of occurrence of message spoofing is reduced, and the verification capability for an error message can be improved.

1. Principle First, the principle will be described. Hereinafter, the unit of data flowing through the transmission line is referred to as a “message”. However, the hierarchy of the communication protocol may be any, for example, “frame” used in the second layer (layer 2) communication or “packet” used in the third layer (layer 3) communication. . The term “packet” described in the claims is used as a representative of these, and “telegram” and “frame” are also synonymous (at least equivalent).

  FIG. 1 is a diagram illustrating an example of a data structure of a message. The electronic message includes a header part (H), an ID part (ID), and a data part (D).

  The header part (H) is a part that is provided at the head of the message and stores control information such as the data length and protocol identifier of the message. The ID part (ID) is a part in which various IDs such as a transmission source / destination device identification code and a telegram identification code are stored. The data part (D) is a part in which information on transmission contents is stored.

  FIG. 2 is a diagram illustrating a conventional method for transmitting a message and the principle of specifying an ID. In the figure, the horizontal axis represents the time axis, and shows a state in which a message with the same content is repeatedly transmitted in the left direction.

  For example, when a transmitter with ID “1” transmits a message, the transmitter transmits a message in which ID “1” is stored in the ID part (ID). Then, the receiver refers to the ID part (ID) of the received message (hereinafter referred to as “received message”), and the received message is transmitted from the transmitter with ID “1”. Know that. In other words, the receiver specifies the ID of the transmitter with one message.

  In this embodiment, instead of storing the ID in the ID part (ID), the numerical value of one term constituting a cyclic sequence (hereinafter referred to as “circulation sequence”) preset for each ID is expressed as “ Stored as “number of rounds”. The number of cycles is set so that the numerical values of two consecutive terms are unique to each other for all IDs.

  Now, for the sake of simplicity, consider a case where a circulation sequence is set for eight IDs “1” to “8”. This corresponds to a case where there are eight transmitters, and IDs “1” to “8” are assigned to the transmitters.

The circulation sequence can be created using various methods, but can be easily created by using a random number generation algorithm called “linear congruential method”.
In the linear congruential method, a random number “X” is generated according to the following recurrence formula (1).
X _{n + 1} = mod (aX _n + c, M) (1)
However, “mod (x, y)” is the remainder when “x” is divided by “y”.

  Here, “a” and “c” are integers that satisfy “0 ≦ a <M” and “0 ≦ c <M”, and are referred to as a multiplier and an increment, respectively. “M” is an integer called a modulus.

  It is known that the random number “X” generated by the expression (1) becomes a uniform random number with a period “M” by appropriately selecting the value of each parameter. Therefore, for example, by dividing the uniform random number with the period “M” into N, it is possible to create N circulation sequences in which the numerical values of the two consecutive terms are unique from each other.

Actually, the random numbers “X ₁ ” to “i” in the case of (i) “M = 16, a = 13, c = 1” and (ii) “M = 16, a = 13, c = 3” Two sets of “X ₁₆ ” were generated, and each set was divided into four to create eight circulation sequences. FIG. 3 shows a result of assigning the created eight circulation sequences to IDs “1” to “8”. However, the four numbers included in each circulation number sequence are cyclic, for example, “1” is next to “12” in the circulation number sequence of ID “1”.

  From this result, it can be seen that the numerical values of the two consecutive terms in the circulation sequence are unique to each other for all IDs. For example, the term follows “1” and “14” only for the circulation sequence with ID “1”, and the term follows “4” and “9” only for the circulation sequence with ID “5”. It is.

FIG. 4 is a diagram showing a method for transmitting a message and the principle of ID discrimination in the present embodiment.
In the ID part of the message, the numerical value of one term of the circulation sequence set in the corresponding ID is selected in the order of the circulation sequence and stored as the circulation value. For example, when a transmitter with ID “1” transmits a message, “1” is assigned to the ID part of the first message, “14” is assigned to the ID part of the second message, and “7” is assigned to the ID part of the third message. ”Is selected and stored in the order of“ ”.

  Then, the receiver transmits the received message from the transmitter having the ID “1” based on the circulation value stored in the ID part of the two consecutive messages and the order (for example, “14” → “7”). Know that it is. Specifically, the number of visits stored in the ID part of the continuously received message and the order of receipt are compared with each of the number of visits set in the ID (see FIG. 3), so that The ID corresponding to the circulation sequence including the circulation value is specified. In other words, the receiver specifies the ID of the transmitter with a plurality of continuous messages.

  Since a unique circulation number sequence is set for each ID, the order of the circulation value values stored in the ID part (ID) of the repeatedly transmitted message varies according to its own rule for each ID. . Further, since the number of rounds stored in the ID part (ID) is different for each message, the Hamming distance between each message is increased. Therefore, the possibility of occurrence of message spoofing is reduced, and the verification capability for an error message can be improved.

2. Modification 2-1. In the above-described example, a case has been described in which a numerical sequence in which the numerical values of two consecutive terms are unique for all IDs is set as the cyclic sequence, but what is unique in the numerical values of two consecutive terms? Although not necessarily, a sequence that is unique among the numerical values of three or more consecutive terms may be set as the circulation sequence.

2-2. Identification of ID based on 3 or more consecutive tournament values In the above-mentioned example, for example, the tournament value included in the second message transmitted by the transmitter with ID “1” was originally “14”, but the noise It is assumed that it has changed to “0” due to the influence. In this case, since the cycle number value continues with “1” and “0” only in the cycle sequence with ID “6” (see FIG. 3), the receiver receives the message from the transmitter with ID “6”. I mistakenly determine that it was sent.

  In order to prevent such a situation, the ID may be specified by three or more continuous messages instead of specifying the ID by two continuous messages. For example, even if the number of tours included in the second message is “0”, if the number of tours included in the first message is “1” and the number of tours included in the third message is “7”, Since there is no circulation sequence with numerical values “1”, “0”, “7” (see FIG. 3), the receiver determines that an error message is included in one of these three messages, Discard these messages.

2-3. Storing multiple tour number values in one message If only one tour number value is stored in one message, two or more messages must be received from the same transmitter in order to specify the ID. There must be. However, there is a case where only one electronic message is received (cannot be performed) due to time restrictions at the time of reception. In this case, the ID cannot be specified. Therefore, two or more tour number values may be stored in one message.

5 and 6 are diagrams showing a transmission method of a message in which two circulation values are stored in one message, and a principle of specifying an ID.
In FIG. 5, “1” and “14” are assigned to the ID part of the first message, “14” and “7” are assigned to the ID part of the second message, and “7” and “12” are assigned to the ID part of the third message. "Is stored as the number of rounds. In other words, two lap count values are selected and stored so that a part of the lap count values of two consecutive messages overlaps.

  In FIG. 6, “1” and “14” are assigned to the ID part of the first message, “7” and “12” are assigned to the ID part of the second message, and “1” and “12” are assigned to the ID part of the third message. “14” is stored as the circulation count value. That is, the number of circulation values is selected and stored two by two so that the number of circulations of two consecutive messages is not duplicated.

  The receiver is a message transmitted from the transmitter whose ID is “1” based on the number of circulations stored in the ID part of each received message and its order (for example, “7” → “12”). Know that there is. Specifically, a plurality of numerical values stored in the ID part of the received message and their order are checked against each of the circulation sequence set in the ID (see FIG. 3), and the numerical values are set in that order. An ID corresponding to the number of cycles included is specified. That is, the receiver can specify the ID with one message.

  Although not described here, the same applies to the case where three or more circulation values are stored in one electronic message. Further, the number of the number of circulation values to be stored can be varied for each message, such as storing “2” number of circulation values in the first message and storing “3” number of values in the second message. Anyway.

2-4. Data ID Conversion Data stored in the data portion (D) of the electronic message may be converted into an ID, and the content (type) of the data may be determined by specifying the ID based on the same principle. Specifically, a data ID is assigned to each content (type) of data that can be stored in the data part (D), and a circulation sequence is preset for each data ID.

  And a transmitter transmits the message | telegram which stored the circulation value in the data part (D), and a receiver specifies data ID based on the circulation value stored in the data part (D) of a reception message. Thus, the content (type) of the data is discriminated.

3. First Example Next, an example in which the present invention is applied to an automatic train control (ATC) system will be described.

3-1. System Configuration First, the system configuration will be described.
FIG. 7 is a diagram showing a schematic configuration of the automatic train control system 1 in the present embodiment.
The track r traveled by the train is divided into a plurality of closed sections (for example, H1 to H5), and a track circuit is laid in each closed section. Each track circuit is connected to the ATC equipment room.

  The ATC equipment room detects the presence of a train for each track circuit. Specifically, since the track circuit is short-circuited by the train axle in the closed section where the train is present, the presence of the train is detected by determining the short circuit of the track circuit.

  For example, in the figure, trains are present in the closed sections H1 and H5, and the track circuits corresponding to the respective closed sections are short-circuited. Thereby, the ATC equipment room detects that a train is present in the closed sections H1 and H5.

  The ATC equipment room creates a telegram for train speed control for each track circuit, and transmits the created telegram to the corresponding track circuit. And when a train passes a blockade section, a train receives a message from a track circuit corresponding to the blockage section concerned. However, as in the case of the conventional ATC system, it is assumed that the train is designed to receive at least three telegrams in one blocked section because of the relationship between the maximum speed of the train and the length of the blocked section.

An example of the data structure of a message transmitted from the ATC equipment room to the track circuit is shown in FIG.
In the telegram, an ID assigned to each track circuit (hereinafter referred to as “track circuit ID”) is stored, and the number of sections to the blockage section where the preceding train is located (hereinafter referred to as “opening”). A data section in which data such as “number of sections” is stored is provided.

  Also, a flag part as a header is provided at the head of the message, and a check code part for storing a check code such as CRC (Cyclic Redundancy Check) is provided at the end.

  In this embodiment, the ATC equipment room does not store the track circuit ID in the track circuit ID portion of the message, but stores the number of rounds for specifying the track circuit ID. Specifically, the ATC equipment room stores track sequence data for each track circuit in which a cycle sequence is set for each track circuit ID, and the track circuit ID section of the message transmitted to the track circuit includes the track circuit ID. The number of times of the number of times set in the track circuit ID is selected and stored in that order.

  Note that the number of circulation count values stored in the track circuit ID section may be any number, but the number of times a train can receive a message from one track circuit is limited. It is desirable to store the above number of rounds.

  The upper side of the car has track data that defines the starting and ending distances for each track circuit ID, the relationship between the number of open sections and distance, track curve restrictions, slope, etc., and the ATC equipment room (ground side). The same number of circulation sequence data and track circuit-specific circulation sequence data are stored.

  Then, when a telegram is received from the track circuit, the track circuit ID is specified based on the count value stored in the track circuit ID section of the received telegram with reference to the track sequence count data for each track circuit. Specifically, the circulation number value stored in the track circuit ID portion of the received message and the order thereof are checked with each of the circulation number sequences stored in the circulation number sequence data for each track circuit, and the number of circulation values is determined in that order. The track circuit ID corresponding to the circulation sequence including is specified.

  Then, referring to the track data, the distance from the train to the preceding train is calculated based on the specified track circuit ID and the data stored in the data portion of the received message. Then, a brake pattern is generated based on the calculated distance, and the vehicle speed is controlled by controlling the operation of the brake according to the generated brake pattern. In addition, since the process and speed control regarding generation | occurrence | production of a brake pattern are well-known, description is abbreviate | omitted.

  For example, in FIG. 7, the train T1 receives a telegram from the track circuit in the closed section H5 that is on the line. Then, the distance to the preceding train T2 existing in the closed section H1 is calculated based on the identified track circuit ID of the closed section H5 and data such as the number of open sections included in the received message. Based on the calculated distance, a brake pattern BP is generated that stops the vehicle before the closed section H1, and the speed of the vehicle is controlled according to the brake pattern BP.

3-2. Functional Configuration Next, the functional configuration will be described.
FIG. 9 is a block diagram showing a functional configuration relating to the present embodiment of the train. The train includes an on-board device 10, an in-car display 20, and a power receiver 30.

  The on-board device 10 is a device that generates a brake pattern and controls the speed of the vehicle, and is a computer that includes a control unit 100 and a storage unit 120. The control unit 100 is an arithmetic device such as a CPU, and performs a speed control process by executing the speed control program 121 of the storage unit 120. A functional unit that performs the speed control process is referred to as a speed control unit 101 for convenience.

  The storage unit 120 is realized by, for example, a hard disk, a ROM, a RAM, and the like, and a speed control program 121 for causing the control unit 100 to function as the speed control unit 101, track data 122, track circuit-specific circulation sequence data 123, Received telegram accumulation data 124, travel data 125, and brake pattern data 126 are stored.

  The track data 122 is data in which the start point / end point distance, the relationship between the number of open sections and the distance, the curve limit of the track, the gradient, and the like are associated with the track circuit ID of the track circuit for each track circuit.

  The track sequence data 123 for each track circuit is data in which a cycle sequence is set for each track circuit, and an example of the data configuration is shown in FIG. In the track circuit-by-track circuit sequence data 123, a track circuit ID 1231 and a circuit sequence 1232 are stored in association with each other. However, in the same figure, illustration of the specific contents of the circulation sequence is omitted.

  The received message accumulation data 124 is data in which messages received from the track circuit are stored and accumulated. The received message accumulation data 124 is added / updated as needed when a new message is received.

  The travel data 125 is data in which travel information such as a train speed and a travel position (about kilometer) is stored. The travel data 125 is updated at any time during travel.

  The brake pattern data 126 is data in which a brake pattern is stored. The brake pattern data 126 is updated as needed when a new brake pattern is generated.

  The in-vehicle display 20 is a display device that performs various displays based on display signals input from the on-board device 10, and is realized by hardware such as a CRT or LCD, for example. The in-vehicle display 20 is provided on the cab and displays a brake pattern generated by the control unit 100.

  The power receiver 30 measures the current (rail current) of the track circuit and receives a received telegram. The received telegram received by the power receiver 30 is processed by the on-board device 10.

3-3. Process Flow Next, the process flow will be described.
FIG. 11 is a flowchart showing a flow of speed control processing executed in the on-board device 10 by reading and executing the speed control program 121.

  First, the speed control unit 101 calculates travel information such as the current travel speed and travel position of the vehicle (step A1), and updates the travel data 125 in the storage unit 120.

  Then, the speed control unit 101 performs braking control according to the travel information stored in the travel data 125 and the brake pattern stored in the brake pattern data 126 (step A3).

  Next, the speed control unit 101 determines whether or not a message has been received from the track circuit (step A5). If it is determined that the message has not been received (step A5; No), the process returns to step A1. On the other hand, when it is determined that a message has been received (step A5; Yes), the received message is stored in the received message accumulation data 124 of the storage unit 120.

  Then, the speed control unit 101 identifies the track circuit ID of the received message (step A7). Specifically, the most recent message stored in the received message accumulation data 124 and the number of cycles stored in the track circuit ID portion of the message received this time and its order are stored in the track sequence count data for each track circuit. The track circuit ID is specified by checking each of the number of circulation sequences.

  When the track circuit ID can be specified in step A7 (step A7; OK), the speed control unit 101 determines the data stored in the data part of the received message (step A9).

  If the data can be discriminated (step A9; OK), the speed control unit 101 refers to the track data 122 in the storage unit 120 and specifies the track circuit ID specified in step A7 and the step A9. Based on the obtained data, the distance from the train to the preceding train is calculated (step A11).

  Next, the speed control unit 101 generates a brake pattern based on the distance to the preceding train calculated in Step A11 (Step A13). Then, the speed control unit 101 updates the brake pattern data 126 of the storage unit 120 with the generated brake pattern (step A15), returns to step A1, and repeats the processing of steps A1 to A15.

  On the other hand, when the track circuit ID cannot be specified in step A7 (step A7; NG), or when the data cannot be determined in step A9 (step A9; NG), the speed control unit 101 Returns to step A1.

3-4. Effects According to the present embodiment, a circulation sequence is preset for each track circuit, and a telegram in which a cycle value for specifying the track circuit ID is stored in the track circuit ID section is transferred from the ATC equipment room to the track. Transmitted to the circuit. Then, when the train passes through the blockage section, the train receives a message from the track circuit of the blockage section, and receives the track circuit ID specified based on the circuit number value stored in the track circuit ID section of the received message. A brake pattern is generated based on data stored in the data portion of the message. The vehicle speed is controlled by performing braking control according to the generated brake pattern.

  Since a unique sequence number is set for each track circuit ID, the order of the cycle value stored in the track circuit ID portion of the message repeatedly transmitted to the track circuit is a unique rule for each track circuit ID. Will change. Moreover, since the number of times of circulation stored in the track circuit ID section changes for each message, the Hamming distance between the messages increases. Therefore, the possibility of occurrence of message spoofing is reduced, and the verification capability for an error message can be improved.

3-5. Modified Example As described in “2-4. Data IDization”, data stored in the data portion of the message transmitted to the track circuit may be IDized. Specifically, an ID (hereinafter referred to as “opening section number ID”) is assigned for each number of open sections that can be stored in the data part, and a circulation sequence is set in advance.

  The ground side (ATC equipment room) and the vehicle upper side (train) store the data of the circulation sequence set for each opening section number ID as the circulation series data by the number of opening sections, and the ground side (ATC equipment room) Transmits a telegram in which the number of laps is stored in the data part to the track circuit. Then, the vehicle upper side (train) determines the number of open sections by specifying the number of open sections ID based on the circulation number value stored in the data portion of the message received from the track circuit.

4). Second Embodiment Next, an embodiment when the present invention is applied to an automatic train stop (ATS) system will be described.

4-1. System Configuration First, the system configuration will be described.
FIG. 12 is a diagram showing a schematic configuration of the automatic train stop system 3 in the present embodiment.
The track r on which the train travels is divided into a plurality of closed sections (for example, H1 to H3), and closed signals (for example, S1 to S3) are installed corresponding to the respective closed sections. Hereinafter, this block signal is appropriately referred to as “signal”.

  Further, on the track r, ground elements (for example, b1 to b3) are laid corresponding to each signal (for example, S1 to S3), and the ground elements are provided in a train passing on the ground element. Data communication is performed with the car upper. Specifically, the vehicle upper element receives a telegram including the current signal display information from the ground element. However, similar to the conventional ATS system, due to the relationship between the maximum speed of the train and the communicable distance between the vehicle child and the ground child, the proximity communication between the vehicle child and the ground child with one pass of the train is possible. Suppose that it is designed to receive at least three messages.

An example of the data structure of a message transmitted from the ground child to the vehicle upper child is shown in FIG.
The telegram includes a ground element ID portion for storing “ground element ID” which is an ID assigned to each ground element, a presenting data section for storing present information of a signal corresponding to the ground element, There is provided a stop signal distance data section in which distance information to a signal (stop signal) indicating a stop indication immediately before the traveling direction is stored. In addition, a flag part as a header is provided at the head of the electronic message, and a check code part in which a check code such as a CRC is stored at the end.

  In the present embodiment, the presenting information is not stored in the presenting data portion of the message, but the number of times of circulation for discriminating the presenting is stored. Specifically, a ground device (not shown) that controls the ground unit has a circulation sequence set for each ID assigned to each signal display (hereinafter referred to as “display ID”). The circulation sequence data is stored. Then, in the display data portion of the message transmitted from the ground element, the number of times of the number of circulations set in the current display ID of the signal corresponding to the ground element is selected and stored in that order. .

  Note that the number of tour count values stored in the current data section may be any number, but since the number of times a train can receive a telegram from one ground element is limited, two consecutive one telegrams can be stored. It is desirable to store the above number of rounds.

  The upper side of the vehicle stores the same number-of-turns circulation sequence data that is the same as the ground device. Then, when a message is received from the ground unit, the current ID is specified based on the number of circulations stored in the presenting data portion of the received telegram with reference to the presenting-specific number-of-turns sequence data. Specifically, the circulation number value stored in the display data portion of the received message and its order are checked with each of the circulation number sequences stored in the number-of-presentation circulation number sequence data, and the number of circulation values is determined in that order. A display ID corresponding to the number of cycles included is specified.

  Then, based on the identified indication ID and the distance data to the stop signal stored in the stop signal distance data part of the received message, a speed check pattern for stopping the vehicle by the stop signal is generated and generated. Vehicle speed control is executed by performing braking control according to the speed check pattern.

  For example, in FIG. 12, the train T1 receives a telegram from the ground element b3 corresponding to the blockage section H3 immediately before the blockage section H4 that is on the line. The ground element b3 corresponds to the signal S3 that informs whether or not it is possible to enter the closed section H3. Therefore, the indication of the signal S3 is specified from the message received from the ground element b3. Moreover, the information of the distance d1 to the signal indicating the stop indication nearest to the traveling direction is acquired from the stop signal distance data portion of the received message.

  Then, based on the distance data up to the stop signal, a speed check pattern VP that stops the vehicle before the stop signal is generated, and the speed of the vehicle is controlled according to the speed check pattern VP. In FIG. 12, since the latest stop signal of the train T1 is the signal S2, a speed check pattern VP for stopping before the signal S2 is generated. In addition, since the process and braking control regarding generation | occurrence | production of a speed check pattern are well-known, description is abbreviate | omitted.

4-2. Functional Configuration Next, the functional configuration will be described.
FIG. 14 is a block diagram showing a functional configuration related to the present embodiment of the train. The train includes an on-board device 40, an in-vehicle display 50, and an on-board element 60.

  The on-board device 40 is a device that generates a speed check pattern and controls the speed of the vehicle, and is a computer that includes a control unit 400 and a storage unit 420. The control unit 400 is an arithmetic device such as a CPU, and performs a second speed control process according to the second speed control program 421 in the storage unit 420. The functional unit that performs the second speed control process is referred to as a second speed control unit 401 for convenience.

  The storage unit 420 is realized by, for example, a hard disk, a ROM, a RAM, and the like, and a second speed control program 421 for causing the control unit 400 to function as the second speed control unit 401, line data 422, and number-by-present circulation sequence Data 423, received message accumulation data 424, travel data 425, and speed check pattern data 426 are stored.

  The track data 422 is data in which the starting point / ending point km, the relationship between the number of open sections and the distance, the curve limitation of the track, the gradient, and the like are associated with the track circuit ID of the track circuit for each track circuit.

  The circuit-by-track circuit circulation number sequence data 423 is data in which a circulation number sequence is set for each signal display, and FIG. 15 shows a data configuration example thereof. A type 4231, a current indication 4232, a current indication ID 4233, and a circulation number sequence 4244 are stored in the current-specific tour number sequence data 423 in association with each other. However, in the same figure, illustration of the specific contents of the circulation sequence is omitted.

  The type 4231 is a signal type, and stores “3 present”, “4 present”, “5 present”, and the like. The indication 4232 is a type of indication, and stores “stop”, “warning”, “caution”, “deceleration”, “progress”, and the like. The display ID 4233 is an ID assigned to each display 4232. The tour number sequence 4244 is a tour number sequence 4244 for uniquely identifying each display ID 4233.

  The received message accumulation data 424 is data in which messages received from the track circuit are stored and accumulated. The received message accumulation data 424 is added / updated as needed when a new message is received.

  The travel data 425 is data in which travel information such as a train speed and a travel position (about kilometer) is stored. The travel data 425 is updated at any time during travel.

  The speed check pattern data 426 is data in which a speed check pattern is stored. The speed check pattern data 426 is updated as needed by newly generating a speed check pattern.

  The in-vehicle display device 50 is a display device that performs various displays based on display signals input from the on-board device 40, and is realized by hardware such as a CRT or LCD. The in-vehicle display 50 is provided on the cab and displays a speed check pattern generated by the control unit 400.

  The on-board element 60 is a receiver that receives a message from the ground element, and outputs the received message to the on-board device 40.

4-3. Process Flow Next, the process flow will be described.
FIG. 16 is a flowchart showing the flow of the second speed control process executed in the on-board device 40 by reading and executing the second speed control program 521.

  First, the second speed control unit 401 calculates travel information such as the current travel speed and travel position of the vehicle (step B1), and updates the travel data 425 in the storage unit 420.

  Then, the second speed control unit 401 performs braking control according to the travel information stored in the travel data 425 and the speed verification pattern stored in the speed verification pattern data 426 (step B3).

  Next, the second speed control unit 401 determines whether or not an electronic message has been received from the ground unit (step B5), and if it is determined that it has not been received (step B5; No), returns to step B1. On the other hand, if it is determined that a message has been received (step B5; Yes), the received message is stored in the received message accumulation data 424 of the storage unit 420.

  And the 2nd speed control part 401 discriminate | determines the ground child ID of the said received telegram (step B7), and when it can discriminate | determine (step B7; OK), identification of presenting ID is performed (step B7). B9).

  Specifically, the latest telegram stored in the received telegram storage data 424, the tour number value stored in the present data portion of the telegram received this time and the order thereof are stored in the present-specific tour sequence data. The display ID is specified by checking each of the number of circulation sequences.

  If the display ID can be specified in step B9 (step B9; OK), the second speed control unit 401 determines the distance data stored in the stop signal distance data part of the received message (step S9). B11).

  If the distance data can be determined (step B11; OK), the second speed control unit 401 uses the track data 422 in the storage unit 420, the display ID specified in step B9, and the step B11. A speed check pattern is generated based on the specified distance data (step B13).

  Next, the second speed control unit 401 updates the speed check pattern data 426 in the storage unit 420 with the generated speed check pattern (step B15), returns to step B1, and repeats the processes of steps B1 to B15.

  On the other hand, if the ground ID cannot be determined in step B7 (step B7; NG), or if the current ID cannot be specified in step B9 (step B9; NG), the second The speed control unit 401 returns to Step B1. Moreover, also when distance data cannot be discriminate | determined in step B11 (step B11; NG), the 2nd speed control part 401 returns to step B1.

4-4. According to the present embodiment, a circulation sequence is set for each display, and a telegram in which a circulation value value for specifying the display is stored in the display data section is transferred from the ground unit to the vehicle unit. Sent to. And the train is the distance information to the latest stop signal stored in the stop signal distance data part stored in the stop signal distance data part of the received message, and the indication specified based on the number of tour times stored in the display data part of the received message The vehicle speed control is realized by generating a speed check pattern based on the above and performing braking control according to the generated speed check pattern.

  Since a unique circulation sequence is set for each indication, the order of the circulation values stored in the indication data portion of the repeatedly transmitted message changes according to its own rule for each indication. Become. Moreover, since the number of times of circulation stored in the presenting data portion changes for each message, the Hamming distance between each message increases. Therefore, the possibility of occurrence of message spoofing is reduced, and the verification capability for an error message can be improved.

4-5. Modifications The ground element ID stored in the ground element ID part of the message transmitted from the ground element to the vehicle upper element may be specified based on the number of times of circulation.

  Specifically, a circulation sequence is preset for each ground element. The ground unit and the train store the data in which the circulation sequence is set for each ground unit as the circulation sequence data for each ground unit, and the ground unit transmits a message in which the circulation number value is stored in the ground unit ID part on the vehicle. Send to child. And a train pinpoints a ground child based on the number-of-trips value stored in the ground child ID part of the message | telegram received from the ground child.

5. Third Embodiment Next, an embodiment when the present invention is applied to a signal security system will be described.

5-1. System Configuration First, the system configuration will be described.
FIG. 17 is a diagram showing a schematic configuration of the signal security system 5 in the present embodiment.
The signal security system 5 is a network system in which a signal handling station control device 70 installed in a signal handling station and a plurality of signal control devices 80 are connected via a network N. The signal control device 80 is connected to a signal S to be controlled (hereinafter referred to as “control target signal”). In this embodiment, for the sake of simplicity, the description will be made assuming that all the signals S are three.

  The signal handling control device 70 transmits a telegram (hereinafter referred to as “present telegram”) that stores the present information of the control target signal of the signal control device 80 transmitted from each signal control device 80 via the network N. The display of all signals S is monitored. In addition, the signal handling control device 70 stores a message (hereinafter referred to as an “operation command message”) that stores an operation command instructing how the signal control device 80 changes the display of the control target signal. Create and send to network N.

  The signal control device 80 controls the display of the control target signal by receiving the operation command message transmitted from the signal handling control device 70. Also, a current telegram is created and sent to the network N.

FIG. 18 shows a data configuration example of a telegram transmitted to the network N in the signal security system 5.
In the electronic message, a transmission source ID portion storing “transmission source ID” that is an ID of a transmission source device, a transmission destination ID portion storing “transmission destination ID” that is an ID of a transmission destination device, A control target signal ID section storing a “control target signal ID” that is an ID of the control target signal and a data section are provided. In the data part of the operation command message transmitted from the signal handling control device 70, the operation command of the control target signal is stored, and in the data part of the present message transmitted from the signal control device 80, the control target signal of the control target signal is stored. Current display information is stored. In addition, a flag part as a header is provided at the head of the message, and a check code part for storing a check code such as CRC is provided at the end.

  In the present embodiment, the operation command and the current information are not stored in the data portion of the message, but the circulation value for determining the operation command and the current information is stored. Specifically, an ID (hereinafter referred to as “operation command ID”) is assigned to each operation command, and similarly, an ID (hereinafter referred to as “display ID”) is assigned to each display. . In addition, a circulation sequence is set in advance for each operation command ID and each display ID.

  Then, the signal handling station control device 70 selects and stores, in the order, the cycle value of the cycle sequence set in the operation command ID corresponding to the operation command of the control target signal in the data part of the operation command message. . Further, the signal control device 80 selects and stores, in the order, the cycle value of the cycle sequence set in the display ID corresponding to the display of the control target signal in the data portion of the display message.

  Note that the number of circulation value values stored in the data portion of the operation command message and the current message may be any number.

5-2. Functional Configuration Next, functional configurations of the signal handling station control device 70 and the signal control device 80 will be described.
The signal handling station control device 70 is a computer that includes a processing unit 700 and a storage unit 720. The processing unit 700 performs signal handling processing according to the signal handling processing program 721 stored in the storage unit 720. The function unit that performs the signal handling process is referred to as a signal handling process unit 701 for convenience.

  The storage unit 720 includes a signal processing program 721 for causing the processing unit 700 to function as the signal processing unit 701, ID data 722, operation command-specific cycle sequence data 723, and current-specific cycle sequence data 724. , Received message accumulation data 725 is stored.

  The ID data 722 stores an ID of the signal handling control device 70, an ID of each signal control device 80, and an ID of each signal S.

  The operation command-by-operation cycle number data 723 is data in which a cycle number sequence is set for each operation command, and a data configuration example is shown in FIG. The operation command-specific cycle number sequence data 723 stores an operation command 7231, an operation command ID 7232, and a cycle number sequence 7233 in association with each other. However, in the same figure, illustration of the specific contents of the circulation sequence is omitted.

  The circulation sequence number data 724 by indication is data in which a circulation sequence is set for each indication, and an example of the data configuration is shown in FIG. A current indication 7241, a current ID 7242, and a circulation number sequence 72432 are stored in the current-specific circulation number sequence data 724 in association with each other. However, in the same figure, illustration of the specific contents of the circulation sequence is omitted.

  The received message accumulation data 725 is data in which the received message is accumulated, and an example of the data configuration is shown in FIG. In the received message storage data 725, a received date 7251 indicating the date when the received message was received, received message data 7252 that is data of the received message, and a process determination flag 7253 are stored in association with each other.

  The processing determination flag 7253 is a flag indicating the processing status of the received message, and is “not yet” when the received message is unprocessed, “done” when the received message is processed, and “decided” when the discard is determined. “Waste” is set for each.

  The signal control device 80 is a computer that includes a control unit 800 and a storage unit 820. The control unit 800 performs signal control processing according to the signal control program 821 stored in the storage unit 820. A functional unit that performs this signal control processing is referred to as a signal control unit 801 for convenience.

  The storage unit 820 includes a signal control program 821 for causing the control unit 800 to function as the signal control unit 801, ID data 722, operation sequence-specific cycle number data 723, current-specific count sequence data 724, and received message accumulation. Data 725 is stored.

5-3. Process Flow Next, the process flow will be described.
FIG. 22 is a flowchart showing a flow of signal handling processing executed in the signal handling control device 70 by reading and executing the signal handling processing program 721.

  First, the signal handling unit 701 performs the process of loop A for each signal S (steps C1 to C17). In loop A, the signal handling unit 701 refers to the ID data 722 in the storage unit 720, and sets the ID of the signal handling unit control device 70 as the transmission source ID stored in the transmission source ID unit of the operation command message. (Step C3).

  Further, the signal handling unit 701 sets the ID of the signal control device 80 as a transmission destination as the transmission destination ID stored in the transmission destination ID unit of the operation command message (step C5), and stores it in the control target signal ID unit. The ID of the signal S is set as the control target signal ID to be performed (step C7).

  Next, the signal handling unit 701 determines whether or not to change the operation command (step C9). If it is determined to change the operation command (step C9; Yes), the circulation sequence data 723 classified by operation command in the storage unit 720 is determined. Referring to FIG. 4, the numerical value of the term in the number of cycles column 7233 associated with the new operation command 7231 is set as the number of times stored in the data part of the operation command message (step C11).

  If it is determined that the operation command is not changed (step C9; No), the signal handling unit 701 is associated with the same operation command 7231 as the previous time as the number of times to be stored in the data part of the operation command message. The numerical value of the term of the circulation number sequence 7233 is set (step C13).

  Then, the signal handling section processing unit 701 transmits an operation command message (step C15), and ends the processing of the loop A.

  When the processing of loop A is completed, the signal handling unit 701 determines whether or not a message has been received (step C19). If it is determined that the message has not been received (step C19; No), the process returns to step C1. .

  On the other hand, if it is determined that a message has been received (step C19; Yes), the signal handling unit 701 stores the received message in the received message storage data 725 in the storage unit 720 (step C21). Specifically, the reception date and time 7251, the received message data 7252 of the received message is stored in association with the process determination flag 7253, and “not yet” is set in the process determination flag 7253.

  Next, the signal handling unit 701 performs processing of the loop B in the order of the received message data 7252 in which the process determination flag 7253 of the received message accumulation data 725 is “not yet” and the reception date and time 7251 is newest (steps C23 to C41).

  In the loop B, the signal handling unit 701 refers to the ID data 722 in the storage unit 720 to determine steps C25 to C31. Specifically, the signal handling unit 701 determines the transmission source ID stored in the transmission source ID part of the received message (step C25), and if it can be determined (step C25; OK) ), And determines the transmission destination ID stored in the transmission destination ID portion of the received message (step C27).

  If the transmission destination ID can be determined (step C27; OK), the signal handling unit 701 determines whether the determined transmission destination ID is the ID of the signal handling control device 70. Thus, it is determined whether or not the received message is addressed to the signal handling station (step C29).

  If it is determined that the signal is addressed (step C29; Yes), the signal handler processing unit 701 determines the control target signal ID stored in the control target signal ID portion of the received message ( Step C31).

  If the control target signal ID can be determined (step C31; OK), the signal handling unit 701 refers to the current-represented circulation sequence data 724 in the storage unit 720, so that the received message is received. The display information stored in the data portion is determined (step C33).

  If the present information can be determined (step C33; OK), the signal handling unit 701 performs a signal state monitoring process (step C35). Specifically, after monitoring the display of each signal S, it is calculated how to change the display of each signal S next.

  Then, the signal handling unit 701 sets the processing determination flag 7253 associated with the received message data 7252 of the received message in the received message accumulation data 725 of the storage unit 720 to “completed” (step C37). The process of loop B is terminated.

  On the other hand, if the transmission source ID cannot be determined in step C25 (step C25; NG), or if the transmission destination ID cannot be determined in step C27 (step C27; No), the signal The handling center processing unit 701 sets the processing determination flag 7253 associated with the received message data 7252 of the received message in the received message accumulation data 725 of the storage unit 720 to “waste” (step C39). End the process.

  Further, when it is determined in step C29 that the received message is not addressed to the signal handling station (step C29; No), the control target signal ID cannot be determined in step C31 (step C31; No), or step Even when the presenting information cannot be determined in C33 (step C33; NG), the signal handling unit 701 shifts the processing to step C39.

  FIG. 23 is a flowchart showing a flow of signal control processing executed in the signal control device 80 by reading and executing the signal control program 821.

  First, the signal control unit 801 performs loop C processing for each signal S (steps D1 to D17). In the loop C, the signal control unit 801 refers to the ID data 722 in the storage unit 820, and sets the ID of the signal control device 80 as the transmission source ID stored in the transmission source ID unit of the current message (step D3). ).

  In addition, the signal control unit 801 sets the ID of the signal handling control device 70 as the transmission destination ID stored in the transmission destination ID portion of the present message (step D5), and the control target stored in the control target signal ID portion The ID of the signal S is set as the signal ID (step D7).

  Next, the signal control unit 801 determines whether or not to change the display (step D9). If it is determined to change the display (step D9; Yes), refer to the circulation sequence data by display 724 in the storage unit 820. Then, the value of the term of the circulation sequence 7243 associated with the new representation 7241 is set as the circulation value stored in the data portion of the current message (step D11).

  If it is determined that the current indication is not changed (step D9; No), the signal control unit 801 is associated with the same current indication 7241 as the previous time as the number of times to be stored in the data portion of the current message. The numerical value of the term in the number of cycles column 7243 is set (step D13).

  Then, the signal control unit 801 transmits a current message (step D15), and ends the process of loop C.

  When the processing of the loop C is completed, the signal control unit 801 determines whether or not a message has been received (step D19). When it is determined that the message has not been received (step D19; No), the signal control unit 801 returns to step D1.

  On the other hand, if it is determined that a message has been received (step D19; Yes), the signal control unit 801 stores the received message in the received message storage data 725 of the storage unit 820 (step D21). Specifically, the reception date and time 7251, the received message data 7252 of the received message is stored in association with the process determination flag 7253, and “not yet” is set in the process determination flag 7253.

  Next, the signal control unit 801 performs the processing of the loop D in the order of the received message data 7252 in which the process determination flag 7253 of the received message accumulation data 725 is “not yet” and the reception date 7251 is the latest (steps D23 to D41).

  In the loop D, the signal control unit 801 refers to the ID data 722 stored in the storage unit 820 to determine steps D25 to D31. Specifically, the signal control unit 801 determines the transmission source ID stored in the transmission source ID portion of the received message (step D25), and if it can be determined (step D25; OK), The transmission destination ID stored in the transmission destination ID portion of the received message is determined (step D27).

  When the transmission destination ID can be determined (step D27; OK), the signal control unit 801 determines whether or not the determined transmission destination ID is the ID of the signal control device 80. Then, it is determined whether or not the received message is addressed to the own device (step D29).

  If it is determined that it is addressed to itself (step D29; Yes), the signal control unit 801 determines the control target signal ID stored in the control target signal ID part of the received message (step D31). .

  If the control target signal ID can be determined (step D31; OK), the signal control unit 801 refers to the operation command-by-operation-sequence number sequence data 723 in the storage unit 820, so that the data of the received message is received. The operation command stored in the unit is discriminated (step D33).

  If the operation command can be determined (step D33; OK), the signal control unit 801 performs a display change process (step D35). Specifically, the display of the control target signal of the control target signal ID determined in step D31 is changed based on the determined operation command.

  Then, the signal control unit 801 sets the processing determination flag 7253 associated with the received message data 7252 of the received message in the received message accumulation data 725 of the storage unit 820 to “completed” (step D37), and loop D Terminate the process.

  On the other hand, if the transmission source ID cannot be determined in step D25 (step D25; NG), or if the transmission destination ID cannot be determined in step D27 (step D27; No), the signal The control unit 801 sets the processing determination flag 7253 associated with the received message data 7252 of the received message in the received message accumulation data 725 of the storage unit 820 to “decommissioned” (step D39), and performs the processing of the loop D. finish.

  If it is determined in step D29 that the received message is not addressed to the own device (step D29; No), if the control target signal ID cannot be determined in step D31 (step D31; No), or step D33. Even in the case where the operation command cannot be determined in (Step D33; NG), the signal control unit 801 shifts the processing to Step D39.

5-4. Effects According to the present embodiment, a circulation sequence is set for each operation command for each signal and each display, and an operation command message in which a circulation value for specifying the operation command is stored in the data section is provided. The signal handling device 70 transmits the signal to the signal controller 80. Then, the signal control device 80 specifies the operation command based on the number of times of circulation stored in the data part of the received operation command message, and controls the display of the control target signal based on the specified operation command.

  In addition, a current telegram in which the number of circulations for identifying the current data is stored in the data portion is transmitted from the signal controller 80 to the signal handling station controller 70. And the signal handling center control apparatus 70 monitors the present of each signal by specifying the present based on the number of rounds stored in the data part of the received present telegram.

  Since a unique circulation sequence is set for each operation command and each indication, the order of the circulation value stored in the data portion of the message repeatedly transmitted is set for each operation command and each indication. It will change with its own rules. Further, since the number of rounds stored in the data part changes for each message, the Hamming distance between the messages increases. Therefore, the possibility of occurrence of message spoofing is reduced, and the verification capability for an error message can be improved.

5-5. Modified example The transmission source ID stored in the transmission source ID portion of the message transmitted to the network N, the transmission destination ID stored in the transmission destination ID portion, and the control target signal ID stored in the control target signal ID portion are circulated. You may decide to specify based on a numerical value.

  Specifically, a circulation sequence is preset for each ID, and the circulation sequence data for each ID is stored in each of the signal handling control device 70 and each signal control device 80. Then, the signal handling control device 70 transmits an operation command message storing the number of circulations to the transmission source ID portion, the transmission destination ID portion, and the control target signal ID portion, respectively. , The transmission source ID, transmission destination ID, and control target signal ID are specified.

  In addition, the signal control device 80 transmits a current message storing the number of times of circulation to each of the transmission source ID portion, the transmission destination ID portion, and the control target signal ID portion. , The transmission source ID, transmission destination ID, and control target signal ID are specified.

6). Others The system to which the present invention can be applied is not limited to the above-described embodiment, and can be applied to any system that repeatedly transmits a telegram storing transmission data having the same content.

The figure which shows the data structural example of a message | telegram. Explanatory drawing of the transmission method of the conventional message | telegram, and an ID specific principle. The figure which shows an example of the rotation frequency sequence set to ID. Explanatory drawing of the transmission method of the message | telegram in this invention, and an ID specific principle. Explanatory drawing of the transmission method and ID specific principle of the message | telegram in a modification. Explanatory drawing of the transmission method of the message | telegram in this invention, and an ID specific principle. The schematic block diagram of an automatic train control system. The figure which shows the data structural example of the message | telegram transmitted in an automatic train control system. The block diagram which shows a function structure. The figure which shows the data structural example of the track | lap circuit count data by track circuit. The flowchart which shows the flow of a speed control process. The schematic block diagram of an automatic train stop system. The figure which shows the data structural example of the message | telegram transmitted in an automatic train stop system. The block diagram which shows a function structure. The figure which shows the data structural example of the circulation frequency sequence data according to presenting. The flowchart which shows the flow of a 2nd speed control process. The schematic block diagram of a signal security system. The figure which shows the data structural example of the message | telegram transmitted in a signal security system. The figure which shows the data structural example of the rotation frequency sequence data by operation command. The figure which shows the data structural example of the circulation frequency sequence data according to presenting. The figure which shows the data structural example of received message | telegram accumulation | storage data. The flowchart which shows the flow of a signal handling process. The flowchart which shows the flow of a signal control process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Automatic train control system 10 On-board apparatus 20 In-vehicle indicator 30 Power receiving device 100 Control part 101 Speed control part 120 Storage part 121 Speed control program 122 Track data 123 Track number data by track circuit 124 Received message accumulation data 125 Traveling data 126 Brake Pattern data

Claims (13)

A transmitter having an ID part and a data part, wherein the transmitter repeatedly transmits a packet storing transmission data of the same content in the data part,
Storage means for storing a numerical string defined for each ID capable of identifying the ID with two or more consecutive numerical values;
ID selection means for alternatively selecting an ID from the plurality of IDs;
A numerical value that newly selects a numerical value constituting a numerical value sequence corresponding to the selected ID among the numerical value sequences stored in the storage means each time a packet is transmitted in the order of the numerical value sequence. A selection means;
A transmission means for storing a numerical value newly selected by the numerical value selection means each time a packet is transmitted in the ID part, and repeatedly transmitting a packet in which transmission data of the same content is stored in the data part;
With transmitter. A transmitter having an ID part and a data part, wherein the transmitter repeatedly transmits a packet storing transmission data of the same content in the data part,
Storage means for storing a numerical string defined for each ID capable of identifying the ID with two or more consecutive numerical values;
ID selection means for alternatively selecting an ID from the plurality of IDs;
Each time a packet is transmitted, a predetermined number of numerical values that are consecutive in the numerical value sequence among the numerical values corresponding to the selected ID among the numerical value sequences stored in the storage means are transmitted. A numerical selection means to be newly selected;
Transmission in which the predetermined number of numerical values newly selected by the numerical value selection means is stored in the ID part in the selection order every time a packet is transmitted, and packets having the same content stored in the data part are repeatedly transmitted. Means,
With transmitter.   Each time the numerical value selection means transmits a packet by a predetermined number in the order of numerical values constituting the numerical value sequence from the numerical values constituting the numerical value sequence corresponding to the ID selected by the ID selecting means. The transmitter according to claim 2 to select.   4. The transmitter according to claim 3, wherein the numerical value selection means selects a numerical value so that a part of the predetermined number of numerical values selected last time is selected again this time. A receiver having an ID part and a data part, receiving a packet in which transmission data of the same content is stored in the data part and repeatedly transmitted;
Storage means for storing a numerical string defined for each ID capable of identifying the ID with two or more consecutive numerical values;
The numerical value stored in the ID part of the continuously received packet and the order of reception are compared with each of a plurality of numerical values stored in the storage unit, and the numerical value sequence including the numerical value is corresponding to the order. ID specifying means for specifying the ID to be performed;
With receiver. A receiver having an ID part and a data part, receiving a packet in which transmission data of the same content is stored in the data part and repeatedly transmitted;
Storage means for storing a numerical string defined for each ID capable of identifying the ID with two or more consecutive numerical values;
A plurality of numerical values stored in the ID part of the received packet and their order are compared with each of the plurality of numerical values stored in the storage means, and an ID corresponding to the numerical value string including the numerical values in that order. ID specifying means for specifying
With receiver. When each ID specified by the ID specifying means based on each successively received packet is the same ID, a predetermined process is performed on transmission data stored in the data portion of the received packet Data processing means,
The receiver according to claim 6, further comprising: A packet having an ID part and a data part in a computer having a storage means and a communication means for storing a numerical string defined for each ID capable of identifying an ID by two or more consecutive numerical values. There is a program for repeatedly transmitting packets storing transmission data of the same content in the data portion,
ID selection means for selecting an ID alternatively from the plurality of IDs;
A numerical value that newly selects a numerical value constituting a numerical value sequence corresponding to the selected ID among the numerical value sequences stored in the storage means each time a packet is transmitted in the order of the numerical value sequence. Selection means,
A transmission means for storing a numerical value newly selected by the numerical value selection means every time a packet is transmitted in the ID part, and repeatedly transmitting a packet in which transmission data of the same content is stored in the data part,
A program for causing the computer to function as A packet having an ID part and a data part in a computer having a storage means and a communication means for storing a numerical string defined for each ID capable of identifying an ID by two or more consecutive numerical values. There is a program for repeatedly transmitting packets storing transmission data of the same content in the data portion,
ID selection means for selecting an ID alternatively from the plurality of IDs;
Each time a packet is transmitted, a predetermined number of numerical values that are consecutive in the numerical value sequence among the numerical values corresponding to the selected ID among the numerical value sequences stored in the storage means are transmitted. Numerical value selection means to be newly selected,
Transmission in which the predetermined number of numerical values newly selected by the numerical value selection means is stored in the ID part in the selection order every time a packet is transmitted, and packets having the same content stored in the data part are repeatedly transmitted. means,
A program for causing the computer to function as A computer having a storage means and a communication means for storing a numerical value sequence defined for each ID capable of identifying an ID by two or more consecutive numerical values, has an ID part and a data part, A program for receiving a packet repeatedly transmitted with the same content of transmission data stored in the data portion,
The numerical value stored in the ID part of the continuously received packet and the order of reception are compared with each of a plurality of numerical values stored in the storage unit, and the numerical value sequence including the numerical value is corresponding to the order. A program for causing the computer to function as ID specifying means for specifying an ID to be performed. A computer having a storage means and a communication means for storing a numerical value sequence defined for each ID capable of identifying an ID by two or more consecutive numerical values, has an ID part and a data part, A program for receiving a packet repeatedly transmitted with the same content of transmission data stored in the data portion,
A plurality of numerical values stored in the ID part of the received packet and their order are compared with each of the plurality of numerical values stored in the storage means, and an ID corresponding to the numerical value string including the numerical values in that order. A program for causing the computer to function as ID specifying means for specifying the ID. A communication method in which a transmitter is a packet having an ID part and a data part, repeatedly transmits a packet in which transmission data having the same content is stored in the data part, and a receiver receives the transmitted packet. Because
An ID selection step in which the transmitter selectively selects an ID from a plurality of predetermined IDs;
A numerical value constituting a numerical value sequence corresponding to the selected ID among the numerical value sequences defined for each of the plurality of IDs capable of identifying the ID by two or more consecutive numerical values. A numerical value selection step for newly selecting each time a packet is transmitted in the order of the numerical value sequence;
A transmitter stores a numerical value newly selected by the numerical value selection step every time a packet is transmitted in the ID part, and repeatedly transmits a packet in which transmission data of the same content is stored in the data part;
The receiver checks the numerical value stored in the ID part of the continuously received packets and the order of reception with each of the plurality of defined numerical sequences, and corresponds to the numerical sequence including the numerical values in the order. An ID specifying step for specifying an ID to be performed;
Including a communication method. A communication method in which a transmitter is a packet having an ID part and a data part, repeatedly transmits a packet in which transmission data having the same content is stored in the data part, and a receiver receives the transmitted packet. Because
An ID selection step in which the transmitter selectively selects an ID from a plurality of predetermined IDs;
Among the numerical values constituting the numerical value sequence corresponding to the selected ID among the numerical value sequences defined for each of the plurality of IDs, in which the transmitter can identify the ID with two or more consecutive numerical values. A numerical value selection step for newly selecting a predetermined number of numerical values consecutive in the order of the numerical value sequence each time a packet is transmitted;
The transmitter stores the predetermined number of numerical values newly selected by the numerical value selection step every time a packet is transmitted in the ID part in the order of selection, and a packet in which transmission data of the same content is stored in the data part. A sending step for sending repeatedly;
The receiver checks the plurality of numerical values stored in the ID part of the received packet and the order thereof with each of the plurality of defined numerical sequences, and the ID corresponding to the numerical sequence including the numerical values in the order. ID identifying step for identifying
Including a communication method.

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