JP4804162B2 - Transponder device and transmission information amount expansion method - Google Patents

Description

  The present invention relates to a transponder device that transmits information between a vehicle upper element mounted on a vehicle and a ground element installed on the ground.

  Conventionally, as shown in FIG. 4, this type of transponder device uses an on-board antenna 51 installed under the floor on the vehicle and an on-ground antenna 61 or an on-ground antenna 64 installed on the ground side. Digital information is transmitted by wirelessly connecting the vehicle and the ground (for example, see Patent Document 1).

  A device on the upper side of the vehicle is composed of an on-board antenna 51 and a transponder transmitter / receiver 52. The transponder transmitter / receiver 52 is connected to another device 53 that supplies transmission data and uses received data. The equipment on the ground side includes a ground element antenna 64 or a ground element antenna 61 that supplies preset transmission data, and a transponder transceiver 62. Other devices 63 are connected to the transponder transceiver 62 in the same manner as the vehicle upper side.

  In the transponder device, since the upper arm is mounted on the moving vehicle, it is not known when transmission / reception is performed with the counterpart station. Further, transmission / reception is performed only for a moment when the vehicle upper element mounted on the vehicle passes over the ground element. For this reason, the information transmitting side repeatedly transmits data of a fixed information amount called a telegram continuously, and the receiving side is configured to obtain information only when the vehicle upper element and the ground element are combined. .

  FIG. 5 exemplifies a data string (message output state) repeatedly transmitted from an existing transponder device. In the transponder device, information is transmitted and received in a format compliant with HDLC (High-level Data Link Control Procedure) in order to ensure the reliability of data to be transmitted and received. In this example, fixed-length data 73 including a message 71 in an HDLC format having a basic length of 80 bits and an adjustment bit 72 for absorbing a change in the number of information due to insertion of “0” is continuously repeated. Has been sent.

  The transmission side repeatedly transmits a message having the same contents, and is set so that a message is transmitted and received a plurality of times between the vehicle and the ground during the moment when the vehicle element passes over the ground element. The receiving side determines that the electronic message has been normally received when the electronic message having the same content is received a plurality of times (for example, see Non-Patent Document 1).

Utility Model Registration No. 2500396 Yuzo Hirose, Kahisa Hirano, “Standard Description (Security Information Transmission Device)”, Signal Safety, Signal Safety Association, March 10, 1987, Vol. 42, No. 3, p. 170

  As described above, the existing transponder device is configured to repeatedly transmit information of a fixed length defined in the basic design a few decades ago. It is desired to expand the amount of information transmitted over the network. The expansion of the information amount can be realized by increasing the length of the fixed length information that is repeatedly transmitted and received.

  However, a new type of transponder device that has expanded the amount of information by this method has been installed by a line segment where the conventional transponder device is installed and a vehicle of another company's line equipped with the conventional transponder device. If it is introduced into a line section, the information transmitted by the new transponder device cannot be received normally by a conventional device.

  The present invention is intended to solve the above-described problem, and a transponder device and a transmission information amount expansion method capable of extending the amount of information that can be transmitted between the vehicle and the ground without affecting conventional equipment. The purpose is to provide.

  The above object is achieved by the inventions of the following items.

(1) In a transponder device that repeatedly transmits a message in HDLC format between a vehicle child mounted on a vehicle and a ground child installed on the ground,
The data is included in the extended information using a bit array that starts with a process stop code that is an array code that cannot be used on the receiving side of the message and that does not hold the message start flag in the HDLC format internally. ,
The transponder device, wherein the extension information is inserted between a telegram to be repeatedly transmitted.

  In the above invention, the extension information of the bit arrangement that starts with the processing stop code and does not hold the start flag of the message in the HDLC format between the messages in the HDLC format that are repeatedly transmitted is included in the extension information. Include data and insert. In the HDLC procedure, the receiving side does not determine that the information is normal after receiving a processing stop code (data in which “1” is 7 bits or more), and then receives a start flag (data of “7E”). It operates to resume receiving the message from the point of time. Therefore, by inserting an extended information part with a bit sequence that starts with a processing stop code and does not hold the start flag of the message between the messages in the HDLC format, the conventional type of receiving the message in the HDLC format is inserted. Since the transponder device does not perform processing on the extended information in response to the reception of the processing stop code, the amount of information can be expanded between the new transponder devices without affecting the conventional device.

(2) In a transponder device that receives a message in HDLC format that is repeatedly transmitted between an on-board child mounted on a vehicle and a ground child installed on the ground,
A transponder device, wherein the extension information transmitted from the transponder device according to (1) is detected from received information, and data included in the extension information is extracted.

  In the above invention, the extension information is detected from the received information, and the data included in the extension information is extracted. The extension information is detected based on, for example, detection of a process stop code. In the message reception function in the HDLC format, information from the detection of the processing stop code until the next detection of the flag is not determined as normal information.

(3) The transponder device according to (1), wherein the extended information is made into a bit array in which the flag is not established by unconditionally inserting “0” for each fixed number of bits.

  In the above invention, the occurrence of a flag in the extended information is prevented by unconditionally inserting a “0” bit for each fixed bit number. Thereby, generation | occurrence | production of a flag can be prevented with a simple process. Further, since the number of inserted “0” s does not change depending on the contents of the extension information, the extension information can be easily set to a fixed length.

(4) The transponder device according to (1) or (3), wherein the extension information has a fixed length.

  In the above invention, the extension information has a fixed length, so that no special identification information is added to the end of the extension information, or data indicating the data length is not added to the beginning of the extension information. Can be recognized, and transmission / reception processing related to the extended information can be simplified and the amount of information can be improved.

(5) In a method for extending the amount of transmission information in a transponder device that repeatedly transmits and receives HDLC format messages between a vehicle child mounted on a vehicle and a ground child installed on the ground,
On the transmitting side, in the extended information using a bit array that starts with a processing stop code, which is an array code that no longer adopts information on the receiving side of the message, and internally does not hold a message start flag in the HDLC format In addition to including the data, the extended information is inserted between the telegrams to be repeatedly transmitted and transmitted.
A transmission information amount expansion method characterized in that the reception side detects the extension information from the received information and extracts data contained in the extension information.

  According to the transponder device and the transmission information amount expansion method according to the present invention, a bit array that begins with a processing stop code and does not hold a start flag of an HDLC format message between HDLC format messages that are repeatedly transmitted. Therefore, it is possible to extend the amount of information that can be transmitted between transponder devices corresponding to the extended information without affecting conventional devices that transmit and receive HDLC format messages. it can.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a configuration of an example of a transmission unit of a transponder device 2 according to an embodiment of the present invention. The transponder device 2 includes a CPU (Central Processing Unit) 3, a ROM (Read Only Memory) 4, a RAM (Random Access Memory) 5, and a data element output from the CPU 3 as an onboard or ground unit. The communication unit 7 supplies power to the antenna 6 and an input / output I / F 8. The information to be transmitted is stored in advance in the ROM 4 and may be set from an external device via the input / output I / F 8.

  FIG. 2 shows an example of the data string 10 transmitted by the transponder device 2 according to the embodiment of the present invention. The transponder device 2 executes a program stored in the ROM 4 to generate a data string 10 as shown in FIG. 2 and outputs the data string 10 to the communication unit 7. The communication unit 7 amplifies the power and transmits the data string from the antenna 6. It is supposed to send.

  The data string 10 to be transmitted has a configuration in which an extension unit 12 is inserted between the telegram 11 in the HDLC format (format conforming to the HDLC procedure). The message 11 includes a flag F indicating the start of a message, a flag F indicating the end of the message, and a data part D sandwiched between the flags F. The data part D includes a CRC (Cyclic Redundancy Check) code, and can detect data errors. In the HDLC procedure, the flag F is defined by data having a bit arrangement of '01111110' ('7E' in hexadecimal notation).

  Here, the valid information included in the message 11 has a fixed length of 80 bits, and the message 11 having the same contents is repeatedly transmitted across the extension unit 12. However, in the data part D, “0” is forcibly inserted when “1” continues for 5 bits so that the same bit arrangement as the flag (7E) does not appear, and the length of the message 11 is “ It varies depending on the insertion amount of 0 ′ (depending on the content of the message). Between the rear end of the expansion unit 12 and the next telegram 11, there is provided an adjustment unit 13 for absorbing fluctuations in the length of the telegram 11 due to the insertion of “0”. The total is adjusted to a fixed length.

  The extension unit 12 is arranged following the end flag F of the telegram 11 and has a configuration in which the extension data 15 is added after the process stop code 14 and starts with the process stop code 14. The process stop code 14 is code data for causing an ABORT state in the HDLC procedure, and “1” is data in which 7 bits or more are continuous. In the transmission of the HDLC procedure, when seven or more pieces of data “1” continue, “synchronization loss” is recognized, and normal data is not captured. Hereinafter, this state is referred to as “ABORT”. Here, as the processing stop code 14, 1-byte code data obtained by adding 1 bit of “0” after 7 bits of “1” is used.

  The extension data 15 is a field for inserting arbitrary extension additional information data 15a. By inserting “0” unconditionally for each fixed bit number (here, 5 bits), the extension data 15 The start flag F (7E) of the message in the HDLC format is not established.

  Further, a bit sequence in which the flag F at the end of the telegram 11 and the processing stop code 14 are continuous is defined as a recognition code 16 for the reception side to recognize the start of the extension unit 12. The recognition code 16 is not limited to the bit arrangement of (flag F + processing stop code 14), and may be information of a bit arrangement that cannot exist in a message in the HDLC format. For example, a combination of the process stop code 14 and predetermined code information following the process stop code 14 may be used, or the process stop code 14 itself may be used as the recognition code 16.

  Here, the extension unit 12 is set to a fixed length so that the data of a predetermined fixed length can be recognized as the extension unit 12 after the recognition code 16 is recognized on the receiving side. In addition, a CRC code (not shown) is added after the extension data 15 to enable the extension unit 12 to detect data errors.

  FIG. 3 shows an example of the configuration of the transponder device 30 on the receiving side as an on-board device. The reception-side transponder device 30 includes a reception demodulation circuit 32 connected to a vehicle upper 31 serving as a reception antenna, and a message detection logic unit 33 that detects a message in HDLC format from information received by the reception demodulation circuit 32. The CPU 35 includes an extended information detection logic unit 34 for detecting the extended unit 12 (extended information) transmitted from the transponder device 2 on the transmission side from the information received by the reception demodulation circuit 32.

  The message detection logic unit 33 performs reception in accordance with the HDLC procedure, and identifies and receives a message based on the detection of the flag F. Further, when a state in which “1” continues for 7 bits or more is detected, the operation enters the ABORT state, and the information until the flag F is detected next is not taken in as normal data.

  The extension information detection logic unit 34 monitors the data string output from the reception demodulation circuit 32 and, when detecting the recognition code 16, recognizes the data string for a fixed length thereafter as the extension unit 12. The extended information detection logic unit 34 extracts the extended additional information data 15a that is the original data from the extended data 15 processed so that the flag F is not established. Here, since “0” is unconditionally inserted for each fixed bit number (here, 5 bits) on the transmission side, “0” inserted for each fixed bit number is reversed. The extended additional information data 15a is extracted by performing the operation.

  The CPU 35 processes information input from the message detection logic unit 33 as a conventional message, and processes information input from the extended information detection logic unit 34 as expanded data. Note that the functions of the electronic message detection logic unit 33 and the extended information detection logic unit 34 may be configured to be realized by the CPU 35 by software processing. If the above function is provided, the configuration of the apparatus is not limited.

  Next, the operation of the extension unit 12 inserted between the telegram 11 and the telegram 11 repeatedly transmitted will be described.

  The receiving unit of the conventional transponder device is configured on the assumption that the telegram 11 having the same content in the HDLC format is repeatedly transmitted, and the extension unit 12 or the like is provided between the telegram 11 having the same content. It is not assumed that different information exists. However, since the conventional transponder device is configured to follow the HDLC procedure, when the processing stop code 14 at the head of the extension unit 12 following the telegram 11 is received, the “synchronization loss” is detected and the ABORT state is detected. Thereafter, the bits until the next flag F (7E) is detected are not determined as valid information.

  Since the extension unit 12 has a bit arrangement in which the flag (7E) is not established internally (a data configuration in which “0” is unconditionally inserted every 5 bits), the reception unit of the conventional transponder device has the extension unit 12 Is recognized as no normal data and is not captured as valid data. For this reason, even if the extension unit 12 is inserted between the telegrams 11 having the same contents that are repeatedly transmitted, the insertion of the extension unit 12 does not affect the conventional reception unit. The receiving unit recognizes that the telegram 11 has been normally received normally and continues processing. The telegram detection logic unit 33 of the transponder device 30 on the receiving side that can handle the extended information performs the same operation as the receiving unit of such a conventional transponder device.

  Since “0” is unconditionally inserted in the extension data 15 every 5 bits, the processing on the transmission side for preventing the flag F (7E) from being established, and the inserted “0” on the reception side. The removal process is simplified and the processing load is reduced.

  Further, since “0” is unconditionally inserted every fixed bit number (5 bits in this example), the number of insertions of “0” does not depend on the data content of the extension data 15, and the extension unit 12 is made to have a fixed length. Easy to do. Further, by setting the extension unit 12 to a fixed length, a special code is added to the end of the extension unit 12 in order to recognize the end of the extension unit 12, or data indicating the length of the extension unit 12 is added. Thus, information can be transmitted efficiently. Further, by setting the extension unit 12 to a fixed length, the extension information detection logic unit 34 of the transponder device 30 on the reception side can easily recognize the termination of the extension unit 12, thereby reducing the processing burden on the reception side. Can do.

  The embodiment of the present invention has been described with reference to the drawings. However, the specific configuration is not limited to that shown in the embodiment, and there are changes and additions within the scope of the present invention. Are also included in the present invention.

  The configuration of the transponder device 2 is not limited to that shown in FIG. 1, and any configuration that can transmit the data string shown in FIG. 2 may be used. For example, the transponder device 2 may be configured by a dedicated logic circuit.

  The method for preventing the flag from being established in the extension unit 12 is not limited to the method of inserting “0” every 5 bits shown in the embodiment, and may be every 4 bits or every 3 bits. Further, only when it is detected that ‘1’ continues for 5 bits, ‘0’ may be inserted, and any method may be used as long as the flag is not satisfied.

  The processing stop code 14 may be any data that can cause the ABORT state, and may be arbitrarily set as long as it is continuous data of 7 bits or more and “1”.

It is a block diagram which shows the structure of the transponder apparatus concerning embodiment of this invention. It is explanatory drawing which shows the data sequence which the transponder apparatus concerning embodiment of this invention transmits. It is a block diagram which shows the structure of the transponder apparatus of the receiving side concerning embodiment of this invention. It is explanatory drawing which shows the use condition example of a transponder apparatus. It is explanatory drawing which shows the data sequence which a conventional transponder apparatus transmits.

Explanation of symbols

F ... Flag D ... Data part 2 ... Transponder device 3 ... CPU
4 ... ROM
5 ... RAM
6 ... antenna 7 ... communication part 8 ... input / output I / F
DESCRIPTION OF SYMBOLS 10 ... Data sequence 11 ... Telegram of HDLC format 12 ... Extension unit 13 ... Adjustment unit 14 ... Processing stop code 15 ... Extension data 15a ... Extension additional information data 16 ... Recognition code 30 ... Receiving side transponder device 31 ... Vehicle onset 32 ... Reception demodulation circuit 33 ... Message detection logic unit 34 ... Extended information detection logic unit 35 ... CPU

Claims (5)

In a transponder device that repeatedly transmits a message in HDLC format between a vehicle child mounted on a vehicle and a ground child installed on the ground,
The data is included in the extended information using a bit array that starts with a process stop code that is an array code that cannot be used on the receiving side of the message and that does not hold the message start flag in the HDLC format internally. ,
The transponder device, wherein the extension information is inserted between a telegram to be repeatedly transmitted. In a transponder device that receives a message in HDLC format that is repeatedly transmitted between a vehicle onboard mounted on a vehicle and a ground unit installed on the ground,
The transponder device, wherein the extension information transmitted from the transponder device according to claim 1 is detected from the received information, and the data included in the extension information is extracted. The transponder device according to claim 1, wherein the extended information is made into a bit array in which the flag is not established by unconditionally inserting "0" for each fixed number of bits. The transponder device according to claim 1 or 3, wherein the extension information has a fixed length. In a transmission information amount expansion method in a transponder device that repeatedly transmits and receives HDLC format messages between a vehicle child mounted on a vehicle and a ground child installed on the ground,
On the transmitting side, in the extended information using a bit array that starts with a processing stop code, which is an array code that no longer adopts information on the receiving side of the message, and internally does not hold a message start flag in the HDLC format In addition to including the data, the extended information is inserted between the telegrams to be repeatedly transmitted and transmitted.
A transmission information amount expansion method characterized in that the reception side detects the extension information from the received information and extracts data contained in the extension information.

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