JP2010013041A - Train control system using radio communications - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cope with problems wherein radio communications between a base station and a mobile station becomes impossible and a train control becomes impossible if the intensity of radio communications gets extremely low in controlling a train with radio communications, and wherein there is a need for always and precisely grasping and monitoring the quality of propagating radio waves. <P>SOLUTION: Radio communications strength, a time and a train position of radio data received from a train during traveling are managed corresponding to each other. When the radio communications strength exceeds a threshold value, alarming is issued and a base station with abnormal radio communications strength is detected, so as to stop a train entering into the base station area in front. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a train control system using wireless communication, and more particularly to a technique for maintaining reliability by maintaining and managing the wireless communication strength of a base station.

  In recent years, there has been a movement to introduce a wireless communication system in train position detection and transmission of train control information to on-board devices. In the United States and China, introduction of a CBTC (Communication Based Train Control) system that performs train control by wireless communication is being promoted. On the other hand, in Europe, the introduction of systems called ETCS (European Train Control System) / ERTMS (European Rail Traffic Management System) is being promoted. ETCS / ERTMS uses GSM-R (Global System for Mobile communications -Railway) based on the GSM network as a wireless communication system.

  As for a train control system using wireless communication, for example, there is a conventional technique described in Patent Document 1. Patent Document 2 describes a technology that uses high-frequency spread spectrum wireless communication in train position determination and control. Patent Document 3 describes a technique for performing mobile communication of a handover method in a train control system using wireless communication, and Patent Document 4 describes a case where a communicating train moves in a train control system using wireless communication. Next, a technique for determining a destination base station to be communicated is described. Further, in Patent Document 5, in the mobile communication system, a common communication slot is prepared between the base station in communication and an adjacent base station of the base station, and the train moves from the base station to the adjacent base station. In this case, a technique for reserving a slot for wireless communication to be used in an adjacent base station and (handover reservation) is described, and Patent Document 5 describes a case where a moving object such as a train or an automobile moves on a route when moving at high speed. A technique is described in which a position detector is installed and a base station is switched by position information from the position detector to shorten a handover time.

  An example of a radio train signaling system is the ETCS project promoted by the European Union. Proceedings of WCRR'97 Vol.C pp.345-349 "The UIC SPECIFICATION FOR ETCS-BALANCING COMPETITION, SAFETY AND INTEROPERABILITY" As finally disclosed, communication using GSM, the European mobile phone standard It is a method to do. Among wireless communication systems, train control is performed using a part of a public wireless network.

FIG. 6 shows a conventional train control system using wireless communication. In this prior art, an on-board control device (position detection unit 1b, operation control unit 1c) is provided on the train 1, and a ground control device (base station 3 and base station 4, base station 5, ground base control station 8, system LAN 6 on the ground. , The management station 7), and the train 1, the base station 3, the base station 4, and the base station 5 are provided with wireless communication units (1a, 3a, 4a, 5a), and the train 1 wirelessly uses its own train position as position information. The information is transmitted to the base station 3 or the base station 4 and the base station 5 by the communication unit 1a, and the base station 3 or the base station 4 and the base station 5 receives the received location information of the train 1 by the ground base control station 8 and the system LAN 6 Pass to 7. The management station 7 calculates the travel permission position of the train 1 based on the position information of each train, and transmits the calculated travel permission position to the train 1 by the base station 3 or the base station 4 or the base station 5. Is a train control system that controls the traveling speed so as not to exceed the received travel permission position.
JP-A-2-109770 Japanese Patent No. 2738464 JP 2000-166531 A JP 2000-168556 A JP 09-307943 A

  When performing train control by wireless communication, if the wireless communication strength becomes extremely low, wireless communication between the base station and mobile station becomes impossible, and there is a problem that train control becomes impossible, and radio wave propagation quality is always accurately monitored and monitored. It is essential to do.

  The present invention collects, stores, and monitors wireless communication strength for each base station in a train control system using wireless communication, and outputs a warning when a base station whose wireless communication strength has become worse than a threshold is detected. The purpose is to provide a maintenance management method.

  The train control system using wireless communication of the present invention performs wireless communication between a mobile station mounted on a plurality of trains moving on a predetermined route and a plurality of base stations installed along a predetermined route. In the train control system by wireless communication, the plurality of base stations receive train position information by wireless communication from mobile stations mounted on the plurality of running trains, measure wireless communication strength, The train position information and the wireless communication strength are transmitted to a ground base station that manages a base station, and the ground base station transmits the received train position information and the wireless communication strength to a management station and a monitoring station. The monitoring station records the received wireless communication strength and the train position information, displays them on a wireless maintenance terminal, and outputs an alarm when the wireless communication strength falls below a predetermined threshold. Features and That.

  The base station measures the wireless communication strength for performing wireless communication with a mobile station mounted on a running train, associates the time with the position of the train, and transmits it to the monitoring station through a LAN (Local Area Network). The monitoring station stores the wireless communication strength and train position information received from the base station in the wireless maintenance terminal, and issues an alarm when a preset alarm threshold is exceeded.

  If wireless communication between the ground and the vehicle becomes impossible due to a failure of the base station, the management station cannot know the current position of the train and cannot control the train. In order to prevent this, when the wireless communication strength of the base station reaches a preset communication disable threshold, the management station controls the train to stop before the communication disable range.

  According to the present invention, the current moving position of the train and the wireless communication intensity at the position can be used for maintenance by displaying on the wireless maintenance terminal, and communication can be performed using the wireless communication intensity data collected from each base station. The possibility of causing problems such as interruptions and communication quality degradation can be predicted, so advance preventive maintenance is possible. Moreover, the occurrence of an event that causes an emergency train stop between stations can be prevented by entering the train into the incommunicable area.

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

  FIG. 1 is a configuration diagram of a train control system using wireless communication according to a first embodiment of the present invention. In the train control system using wireless communication shown in FIG. 1, in a moving train 1, a wireless communication unit 1 a, a position detection unit 1 b that detects the position of the train 1, and operation control that performs operation control of the train 1. Part 1c is provided.

  A plurality of base stations 3, 4, and 5 arranged at regular intervals are arranged along the track 2 along which the train moves. The base stations 3, 4, and 5 are connected to the wireless communication units 3a and 4a. 5a and communication strength measuring units 3b, 4b and 5b for measuring the wireless communication strength.

  Between the terrestrial base control station 8 that manages the plurality of base stations and the management station 7, a system LAN 6 that connects them to exchange information is arranged, and the management station 7 stores the train position information. An on-board information input unit 7a to receive, a train control unit 7b for controlling the operation of the train 1, a base station selection unit 7c, and a maintenance terminal 7d are provided.

  The system LAN 6 is connected to a monitoring station 9 for monitoring and maintaining the wireless communication strengths of the plurality of base stations, and the monitoring station 9 records wireless communication strengths for recording the wireless communication strengths of the plurality of base stations. A unit 9a, a radio maintenance terminal 9c for displaying the train position information and radio communication intensity, and an alarm output unit 9b for issuing an alarm when the radio communication intensity reaches a preset threshold.

  Hereinafter, it demonstrates in order according to the flow of a process. In FIG. 1, the position detection unit 1b of the train 1 detects the current position and passes it to the wireless communication unit 1a. The wireless communication unit 1a transmits wirelessly to the wireless communication unit 3a (or 4a, 5a) of the base station 3 (or 4, 5) on the ground side within the communication area. The communication strength measuring unit 3b (or 4b, 5b) measures the wireless communication strength, and passes it to the ground base station 8 together with the received location information. The terrestrial base station 8 aggregates the location information and wireless communication strength received from all base stations managed by the own device, and transmits them to the management station 7 and the monitoring station 9 via the system LAN 6.

  The management station 7 performs train control of the train 1 based on the received position information. The monitoring station 9 stores the received location information and the wireless communication strength in the wireless communication strength recording unit 9a and displays them on the wireless maintenance terminal 9c. When the wireless communication intensity exceeds a preset alarm threshold, the alarm output unit 9b issues an alarm.

  FIG. 4 is an explanatory diagram of the wireless communication strength of the base station 4 and the position of the train 1. When the train 1 is present at the location 18a, the alarm output unit 9b issues an alarm because the wireless communication intensity line 12 has reached the alarm threshold value 17a. When the train 1 is present at the location 18b, the wireless communication strength line 12 has reached the communication disconnection threshold value 17b. Therefore, in order to avoid communication disconnection, the alarm output unit 9b issues a communication disconnection alarm.

  The train control unit 7b obtains a stop position so that the train stops before the incommunicable area based on the communication interruption alarm received by the system LAN 6, and the ground base station 8 and the base stations 3, 4, and 5 A stop command is given to the train 1 through the terminal. In addition, by displaying FIG. 4 on the screen of the wireless maintenance terminal 9c, it is possible to easily confirm the communication disconnection point that is the target of the communication disconnection alarm.

  FIG. 3 shows the main items of communication data transmitted between the devices. Data 13 transmitted from the train 1 to the base station 3 (or 4, 5) is a train ID 13a, position information 13b, and train information 13c. Data 14 transmitted from the base station 3 (or 4, 5) to the terrestrial base station 8 is the base station ID 14a, the radio communication strength 14e, and the data 13 received from the train 1.

  Data 15 transmitted from the terrestrial base station 8 to the management station 7 and the monitoring station 9 is information received from each base station and the ID 15a of its own device, and the management station 7 and the data via the system LAN 6 Transmit to the monitoring station 9. The management station 7 calculates the travel permission position of the train 1 based on the position information of each train received from the ground base control station 8, and the train control information 16 such as the calculated travel permission position is stored in the ground base control station. 8 and the base station 3, 4, 5 to the train 1. Data 10 to be transmitted from the monitoring station 9 to the management station 7 includes a terrestrial base station ID 10a, a base station ID 10b, and an alarm type 10c (a wireless communication strength lowering alarm / communication interruption alarm / base station maintenance alarm).

  FIG. 2 is a diagram illustrating a communication area in which the base station 3, the base station 4, and the base station 5 communicate with the train 1. The area where the base station 3 can communicate is 11a, the area where the base station 4 can communicate is 11b, and the area where the base station 5 can wirelessly communicate is 11c. When the train 1 is located in the overlapping area of the 11a and 11b, it can communicate with two adjacent base stations of the base station 3 and the base station 4. Further, when the train 1 is in the overlapping area of the 11b and 11c, it can communicate with two adjacent base stations of the base station 4 and the base station 5.

  In the train control system using wireless communication described in the first embodiment, when the base station is arranged as shown in FIG. 2, the train 1 is in an area where it can communicate with the two base stations 11b and 11c. When the output unit 9b issues an alarm for the base station 4, the base station selection unit 7c discards the position information received from the base station 4 and continues to receive the position information from the base station 5.

  In the train control system using wireless communication described in the first embodiment, the wireless maintenance terminal 9c analyzes the wireless communication strength of each base station from the data stored in the wireless communication strength recording unit 9a, and When it is found that the wireless communication strength is gradually decreasing, an alarm requesting effective maintenance is issued in order to improve the communication quality of the base station.

  FIG. 5 is a time chart of the radio communication intensity of the base station 4 displayed on the radio maintenance terminal 9c. The alarm output will be described using FIG. 5 as an example. When the wireless communication strength line 20 reaches a preset maintenance threshold value 21, the alarm output unit 9 b issues a maintenance request alarm to the base station 4. .

FIG. 1 is a configuration diagram of a maintenance management device of a train control system by radio. FIG. 2 is a diagram illustrating a communication area for communicating with a train for each base station. FIG. 3 is a structure diagram of communication data. FIG. 4 is an explanatory diagram of the radio communication strength of the base station 4 and the train position. FIG. 5 is an explanatory diagram of the wireless communication intensity and time of the base station 4. FIG. 6 is a block diagram of a conventional train control system using radio.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Train 1a Wireless communication part 1b Position detection part 1c Operation control part 2 Train travel line 3 Base station 4 Base station 5 Base station 6 System LAN
7 Management station 7a On-board information input unit 7b Train control unit 7c Base station selection unit 7d Maintenance terminal 8 Ground base control station 9 Monitoring station 9a Wireless communication locality recording unit 9b Alarm output unit 9c Wireless maintenance terminal 10 From monitoring station to management station Data to be transmitted 11a Base station 3 area 11b Base station 4 area 11c Base station 5 area 12 Base station 4 wireless communication strength curve 13 Data to be transmitted from train to base station 14 Base station to ground base management Data to be transmitted to the station 15 Data to be transmitted from the terrestrial base station to the management station / monitoring station 16 Data to be transmitted from the management station to the train 17a Alarm threshold value for wireless communication strength 17b Threshold value for communication interruption 19 When the maintenance threshold value is reached 20 Base Station 4 wireless communication strength curve 21 Base station maintenance threshold

Claims (3)

In a train control system by wireless communication that performs wireless communication between a mobile station mounted on a plurality of trains moving on a predetermined route and a plurality of base stations installed along a predetermined route,
The plurality of base stations receive train position information by wireless communication from mobile stations mounted on the plurality of running trains, measure wireless communication strength, and control the base station. Send the train position information and the wireless communication strength,
The ground base station transmits the received train position information and the wireless communication strength to a management station and a monitoring station,
The monitoring station records the received wireless communication strength and the train position information, displays them on a wireless maintenance terminal, and outputs an alarm when the wireless communication strength falls below a predetermined threshold. And train control system. In the train control system by wireless communication according to claim 1,
Storage means for storing train position information and wireless communication strength recorded in the monitoring station for the plurality of base stations, and detecting changes in the wireless communication strength information of the plurality of base stations stored by the storage means, Means for detecting a base station whose operation is abnormal, and a train control system by wireless communication. In the train control system by wireless communication according to claim 2,
When the monitoring station detects a base station that operates abnormally, the management station controls the train that enters the area where the base station that operates abnormally exists to stop before the area. A train control system using wireless communication.

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