JP6581553B2 - Railway security system - Google Patents

Description

  The present invention relates to a non-control data communication for a man-machine terminal or the like in a control network for a railway security system.

  In a communication network for railway security systems, particularly a control network that transmits and receives data used for train control, the fail-safeness of data, real-time performance, etc. are important in addition to the reliability of network communication. The real-time property mentioned here means that the process is executed at least once within one control cycle of a specified fixed time. In addition, with the increasing performance of computers and the speeding up of networks, the number of functions implemented in railway security systems is increasing, and the need to communicate a large amount of data with a large number of other parties has also increased.

  On the other hand, in the control network of the railway security system, if communication data dropout or delay occurs, real-time performance will be lost, so communication data that is not directly related to train control will be reduced as much as possible, and the network load will be reduced. It is necessary to prevent communication data loss and delay.

  For this reason, in a conventional network for railway security systems, man-machine terminals that perform system maintenance operations such as system status display, log collection, and software loading for devices on the network are used for communication data for train control. It was provided separately from the control network so as not to affect the system.

  Since it is costly to separate the networks, it is desirable that the control system network and the network for the man-machine terminal be shared if possible. With the recent increase in network speed, it has become possible to integrate the communication data of man-machine terminals into the control system network. However, it may occupy the bandwidth of the communication path for a long time, such as large-capacity soft loading. Regarding data communication, there is a problem that the possibility of affecting the communication of control data cannot be wiped out.

  On the other hand, a method for preferentially transmitting data by using the concept of QoS in the network and a method for stably transmitting only desired data using a dedicated band have been tried.

  According to Patent Document 1, “the criterion of the priority order is determined according to the determination position, and the position of the mobile device is first determined so as to enable data transmission from the mobile data exchange device 3 according to the priority order. The arrangement is intended and configured for the purpose of enabling communication according to the position. "

  Patent Document 2 states that “upstream signal transmission to a base station is performed at a frequency assigned to each mobile body so that it does not overlap with neighboring mobile bodies, and that the signal received from the base station side is addressed to itself. Base station side that performs downlink signal transmission to the mobile body at a common frequency and discards duplicates from signals received from the mobile body and transfers information to the backbone network And a selection device ”.

Special table 2011-503921 JP 2005-269069

  A control network for a railway security system often multiplexes communication paths in order to secure an operation rate. Therefore, if one of the multiplexed communication channels is occupied only when transmitting a large amount of communication data, the communication data for the man-machine terminal affects the communication of the control data while maintaining the real-time property of the train control. You can send without giving. However, if the communication path through which control data is exchanged fails, the control data cannot be exchanged until the communication data transmission for the man-machine terminal is completed and the occupation is released, thereby impairing real-time performance of train control. There is a problem that the operating rate of the entire system is lowered.

  Therefore, in the multiplexed control network for the railway security system, one communication path is dedicated to data communication for man-machine terminals, and the real-time performance of train control and operation of the entire system is possible even when another communication path fails. There is a problem in securing the rate.

  In order to solve the above-mentioned problems, one of the representative railway security systems of the present invention includes an occupancy instruction transmission device that generates and transmits control data for controlling a train, and receives control data according to the control data. An occupancy instruction receiving device that controls the train, the occupancy instruction transmitting device and the occupancy instruction receiving device transmit and receive data through multiplexed communication paths, and the occupancy instruction transmitting apparatus uses a large communication capacity of the communication path. When performing capacity communication, after transmitting an occupancy start instruction instructing the start of occupying a specific communication path, perform large-capacity communication over a specific communication path, and when ending large-capacity communication, occupy a specific communication path After transmitting the occupation end instruction that instructs the end of the network, when the large-capacity communication through the specific communication path is terminated and the occupation release instruction that instructs the release of the occupation of the specific communication path is received, the large communication through the specific communication path is performed. Yong The communication is terminated, and when the exclusive instruction receiving device receives the exclusive start instruction, the exclusive instruction receiving device stops data transmission to the specific communication path, and when receiving the exclusive end instruction, starts the data transmission to the specific communication path. When data transmission to a specific communication path is stopped, when an abnormality of the occupation instruction receiving device or the communication path is detected, data transmission to the specific communication path is started and an occupation release instruction is transmitted to the occupation instruction transmission device. Is achieved.

  According to the present invention, each occupancy instruction receiving device stops transmitting a message to the occupying communication path by an occupancy start instruction from the occupancy instruction transmitting device, so that the occupancy instruction transmitting device transmits a large-capacity message, Real-time performance of the system can be secured.

It is the figure which showed the example of the railroad security system which performs the data communication by a present Example. It is a figure which shows the example of the state transition which concerns on the communication path occupation of the occupation instruction | indication transmission apparatus of the railway security system which performs the data communication by a present Example. It is a figure which shows the example of the state transition which concerns on the communication path occupation of the occupation instruction | indication receiver of the railway security system which performs data communication by a present Example.

  Hereinafter, an embodiment of non-control data communication in a control network for a railway security system according to the present invention will be described with reference to the drawings.

  FIG. 1 shows an outline of a control network for a railway security system that performs non-control data communication.

  Although only one occupancy instruction transmitting apparatus 101 is described, a plurality of occupancy instruction transmitting apparatuses 101 can be provided on the same network. However, it is not possible to occupy a communication path at the same time with a plurality of occupation instruction transmission devices 101. The exclusive instruction receiving devices 102, 103, 104, and 105 are connected to the same network as the exclusive instruction transmitting device 101.

  The occupancy instruction receiving devices 102, 103, 104, and 105 are not necessarily connected to the occupancy instruction transmitting device 101 on all communication paths. The occupancy instruction transmitting device 101 and the occupancy instruction receiving devices 102, 103, 104, and 105 need only be connected on at least one communication path.

  The multiplexed communication path 106 is described as a bus type, but the network topology is not limited. It may be a wireless network or a wired network. The occupied communication path 107 is one of the multiplexed communication paths 106, and usually a train control message is transmitted and received. According to the occupation start instruction from the occupation instruction transmission device 101, the dedicated communication path 107 is used for transmitting a large-capacity message from the occupation instruction transmission device 101 of the train control message.

  FIG. 2 shows a state transition diagram related to the occupation of the communication path of the occupation instruction transmitting apparatus 101. The initial state is an unoccupied state 201. When an event that requires occupying a communication path such as transmission of a large-capacity message occurs in the occupancy instruction transmission apparatus 101, an occupancy start instruction is transmitted to the occupancy communication path 107, and the state transitions to the occupancy preparing state 202. When the exclusive permission response is received from all the exclusive instruction receiving apparatuses 102, 103, 104, and 105, the state transits to the exclusive state 203. When the occupancy start instruction is received by the occupancy instruction transmitting apparatus 101 in the occupying preparation state 202, an occupancy non-permission response is transmitted to prevent simultaneous transmission of a large-capacity message.

  In the occupied state 203, when the message transmission is completed, an occupation end instruction is transmitted to the occupied communication path 107, and the state shifts to the occupied release state 204. In the exclusive release state 204, transition to the non-occupied state 201 is made upon receipt of an exclusive end response from all the exclusive instruction receiving devices 102, 103, 104, and 105.

  Even if the message transmission is not completed in the occupied state 203, when an abnormality occurs in the multiplexed communication path 106 other than the occupied communication path 107, or when the occupation instruction receiving devices 102, 103, 104, 105 When it becomes impossible to exchange train control messages on the multiplexed communication path 106 other than the occupied communication path 107 due to an abnormality or the like, the occupancy instruction receiving devices 102, 103, 104, and 105 that have detected the abnormality send an occupancy release instruction. Send. The occupation instruction transmission apparatus 101 in the occupied state 203 transitions to the non-occupied state 201 upon reception of the occupation release instruction.

  Even in the occupancy cancellation state 204, there is a possibility that train control telegrams cannot be exchanged on the multiplexed communication path 106 other than the occupancy communication path 107. When the release instruction is received, the state transits to the unoccupied state 201.

  Moreover, in the occupying preparation state 202 and the occupancy releasing state 204, the transition to the next state is made upon receipt of a response from all devices, but it is also possible that other devices stop while waiting for a response. It is done. Therefore, the occupancy instruction transmission device 101 can monitor the operation state of each of the occupancy instruction reception devices 102, 103, 104, and 105, and can select a device waiting for a response at any time.

  FIG. 3 shows a state transition diagram relating to the occupation of the communication path of the occupation instruction receiving apparatuses 102, 103, 104, and 105. The initial state is an unoccupied state 301. When the occupancy instruction receivers 102, 103, 104, and 105 receive the occupancy start instruction from the occupancy instruction transmitter 101, the occupancy instruction receivers 102, 103, 104, and 105 confirm whether the train control message can be transmitted to the multiplexed communication path 106 other than the occupied communication path 107. If the transmission is possible, the exclusive permission response is transmitted to the exclusive communication path 107 and the state transits to the occupied state 302. When the train control message cannot be transmitted to the multiplexed communication path 106 other than the occupied communication path 107, an exclusive non-permission response is transmitted to the exclusive communication path 107, and the state remains the non-occupied state 301.

  In the occupied state 302, the occupancy instruction receiving devices 102, 103, 104, and 105 do not transmit the train control message to the occupied communication path 107, and use the multiplexed communication path 106 other than the occupied communication path 107 to train control messages. Send.

  In the occupied state 302, if the exclusive end instruction is received from the exclusive instruction transmitting apparatus 101, or the exclusive release instruction is received from any of the exclusive instruction transmitting apparatus 101 and the exclusive instruction receiving apparatuses 102, 103, 104, 105, After transmitting the end response, the state transits to the non-occupied state 301. In addition, even when train control messages other than the occupied communication path 107 can be exchanged on the multiplexed communication path 106, an occupation release instruction is transmitted to the occupied communication path 107, and the state transitions to the unoccupied state 301.

  According to this embodiment, even when all communication channels other than the occupied communication channel become abnormal, the occupation state of the occupied communication channel is immediately released by the occupation release instruction from the occupation instruction receiving device, and the operating rate of the entire system is increased. I can keep it.

  In the present invention, the instruction and response transmission method related to the occupation of the communication path is not mentioned, but means for ensuring reliability against data corruption or loss on the communication path can be separately provided. For example, the reliability of the communication path is ensured by combining data corruption detection by CRC, an instruction when there is no response for a certain period of time, and a response retransmission mechanism.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

101 ... Occupancy instruction transmitting apparatus 102, 103, 104, 105 ... Occupation instruction receiving apparatus 106 ... Multiplexing communication path 107 ... Occupied communication path 201, 202, 203, 204 ... Occupation instruction transmitting apparatus states 301, 302 ... Occupation instruction receiving apparatus Status

Claims (3)

An occupancy instruction transmitter for generating and transmitting control data for controlling the train;
An occupancy instruction receiving device that receives the control data and controls the train according to the control data,
The occupancy instruction transmission device and the occupancy instruction reception device transmit and receive data through multiplexed communication paths,
The occupancy instruction transmitting device is
When performing large-capacity communication that uses a large communication capacity of the communication path, after transmitting an occupation start instruction instructing the start of occupation of a specific communication path, perform the large-capacity communication through the specific communication path,
When ending the large-capacity communication, after transmitting an occupation end instruction instructing the end of occupation of a specific communication path, the large-capacity communication by the specific communication path is terminated
When receiving an exclusive release instruction instructing release of occupation of the specific communication path, the large-capacity communication through the specific communication path is terminated,
The occupation instruction receiving device includes:
When receiving the occupation start instruction, stop data transmission to the specific communication path,
When receiving the occupation end instruction, start data transmission to the specific communication path,
When an abnormality of the occupancy instruction receiving device or the communication path is detected while data transmission to the specific communication path is stopped, data transmission to the specific communication path is started, and the occupancy release instruction is transmitted to the occupancy instruction A railway security system characterized by transmitting to a transmitter. In the railway security system according to claim 1,
The occupation instruction receiving device includes:
When the occupancy start instruction is received, if the occupancy start instruction is not received from another occupancy instruction transmission device, an occupancy permission response for permitting occupancy is transmitted to the occupancy instruction transmission device,
The occupancy instruction transmitting device is
When performing the large-capacity communication, after transmitting the occupancy start instruction, when receiving the occupancy permission response from all the occupancy instruction receivers to be communicated, performing the large-capacity communication through the specific communication path Railway security system characterized by In the railway security system according to any one of claims 1 to 2,
The occupation instruction receiving device includes:
When the exclusive end instruction is received, an exclusive end response that is a response to the exclusive end instruction is transmitted to the exclusive instruction transmitting device,
The occupancy instruction transmitting device is
When ending the large-capacity communication, after transmitting the occupancy termination instruction, when receiving the occupancy termination response from all the occupancy instruction receivers to be communicated, the large-capacity communication through the specific communication path is terminated. Railway security system characterized by

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