JP5424319B2 - Train operation information distribution device, IP multicast distribution method, and train operation information distribution method - Google Patents

Description

  The present invention relates to a train operation information distribution device, an IP multicast distribution method, and a train operation information distribution method.

  When an accident or train delay occurs, the operation command center and the operators and station staff communicate with each other using railroad radio. Since this railway radio can only transmit information by voice, the demand for information transmission such as still image data and moving image data is increasing with the recent advancement and complexity of the railway business. In addition, in order to improve business efficiency, a technology that enables such information to be received by a portable wireless terminal such as a PDA (Personal Digital Assistance) by wireless transmission is also desired.

  However, in order to realize this, not only does it cost enormous cost to install radio information communication facilities for each line section, but also it takes a great burden to apply to the Ministry of Internal Affairs and Communications for the radio frequency band to be used and obtain permission. Will occur.

  On the other hand, for example, Patent Document 1 discloses a technique for distributing train operation information to a mobile phone by using the Internet, which is a public communication line.

  According to this, it seems that the cost of communication equipment can be reduced to use an existing public communication line, but a large amount of data such as still image data and moving image data is transferred to many wireless terminals. Since distribution requires a large transmission capacity, there has been a problem of squeezing the communication band of the public communication line.

JP 2002-308100 A

  An object of the present invention is to provide a low-cost train operation information distribution device, an IP multicast distribution method, and a train operation information distribution method capable of efficiently distributing large amounts of information such as images to a wireless terminal with a small transmission capacity. That is.

  In order to solve the above-described problems, a train operation information distribution device according to the present invention acquires operation information from an operation management device, and provides a wireless communication service for public mobile communication by IP multicast communication via a public communication network. The operation information is distributed to a plurality of wireless terminals via a communication base station.

  Since the train operation information distribution device according to the present invention acquires operation information from the operation management device, accurate information can be obtained in a timely manner. And since the operation information is distributed to a plurality of wireless terminals by relaying the wireless communication base station provided for the public mobile communication service via the public communication network, the cost of the communication equipment can be reduced, and the driver Station staff can receive operation information regardless of their location by using a portable wireless terminal.

  Further, as a characteristic part of the present invention, since the train operation information distribution device distributes operation information by IP multicast communication, the operation information is transmitted to a router having an IP multicast function only once, and this is transmitted to the same group. Can be distributed to all wireless terminals belonging to the network. Therefore, since the distribution does not impose a communication band of the public communication network, a large amount of information such as an image can be efficiently distributed to the wireless terminal with a small transmission capacity. In addition, since IP, which is the most general-purpose protocol, is used, information can be received by a general-purpose wireless terminal such as a PDA or a netbook personal computer, and the equipment cost can be reduced.

  At this time, if IP-VPN is adopted as a public communication network, a communication network such as a dedicated line can be constructed unlike the Internet opened to the general public, and security is improved by a specific label technology and encryption technology. In addition, the communication quality can be improved by a bandwidth guarantee technique.

  An IP multicast distribution method according to the present invention is a method for distributing the train operation information to the plurality of wireless terminals using the train operation information distribution device described above for each railroad operator, and for each railroad operator. In addition, a common group address is assigned to the plurality of wireless terminals.

  According to the IP multicast distribution method according to the present invention, a common group address is assigned to a plurality of wireless terminals for each railway operator, so that the destination of the train operation information is distinguished according to this group address, and the train is assigned to each railway operator. The operation information can be distributed to a plurality of wireless terminals. Therefore, the train operation information of other railway operators is not erroneously distributed to the wireless terminals belonging to a certain railway operator. The IP multicast distribution method according to the present invention is particularly effective when applied to urban stations where routes of a plurality of railway operators are concentrated.

  On the other hand, in the train operation information distribution method according to the present invention, the train operation information distribution device obtains operation information from the operation management device, and the train operation information distribution device is configured to perform IP multicast communication via a public communication network. And relaying the operation information to a plurality of wireless terminals by relaying a wireless communication base station serving a public mobile communication service. Here, the public communication network is preferably an IP-VPN.

  According to the train operation information distribution method and the IP multicast distribution method according to the present invention, the same operation and effect as the above-described train operation information distribution apparatus have the same invention-specific matters.

  As described above, according to the present invention, a low-cost train operation information distribution device, an IP multicast distribution method, and a train operation that can efficiently distribute a large amount of information such as an image to a wireless terminal with a small transmission capacity. An information distribution method can be provided.

It is a network block diagram containing the train operation information delivery apparatus which concerns on this invention. It is a network block diagram which implement | achieves the IP multicast delivery method which concerns on this invention.

  FIG. 1 is a network configuration diagram including a train operation information distribution apparatus according to the present invention. The train operation management system N includes an operation information distribution device 1, a train operation management device 2, an operation information management device 3, and an operation information management console 4. Here, the train operation management device 2 includes a camera device 20, a PRC device 21, and a CTC central device 22.

  These devices and the like are connected via a LAN so that they can communicate with each other. Among these, the operation information distribution device 1, the PRC device 21, the CTC central device 22, the operation information management device 3, and the operation information management console 4 are connected to the first and second control lines L1 and L2. Has been. The PRC device 21 and the operation information management device 3 are connected to the diagram line L3. The first and second control lines L1 and L2 have a redundant configuration in which the same data always flows, and even if one of them fails, communication can be continued by the other. Furthermore, the operation information distribution apparatus 1 is connected to the operation information management apparatus 3 via another LAN.

  However, these communication lines are not limited to LANs using metal lines (metal cable lines), but may be wireless communication lines or optical lines, and more specifically, ATM (Asyncronus Transfer Mode). It is also possible to adopt a dedicated line other than the LAN such as a line or a frame relay line.

  Thus, the apparatus etc. which perform train operation management construct a communication network, and cooperate with each other by communication between apparatuses, and perform operation management of a train. The effects of each device will be described below.

  The camera device 20 is installed at a station platform or the like and photographs the situation of the railway operation site. And the moving image data etc. which were imaged are transmitted to the operation information management apparatus 3 as operation data S0.

  The PRC device 21 tracks the train position according to the train detection signal input from each track circuit, and determines the route of the train based on the tracking information and the operation schedule information received from the diagram creation device (not shown). Control appropriately. In addition, the PRC device 21 transmits operation data S1 including the tracking information of the train position and the route control information to the operation information distribution device 1 and the operation information management device 3.

  The CTC central device 22 transmits a control signal such as a traffic light or a switch to each CTC station device (not shown) according to the route control of the PRC device 21. And a CTC station apparatus controls a traffic light, a switch, etc. via an interlocking device based on a control signal. In addition, the CTC central device 22 transmits operation data S2 including display information on traffic lights and switches to the operation information distribution device 1 and the operation information management device 3.

  The operation information management device 3 organizes the operation data S0 to S2 based on the operation diagram information D received from the diagram creation device, and distributes the operation information together with the operation data S0 in order to perform appropriate distribution according to the situation. A distribution instruction signal S4 is transmitted to the device 1.

  The operation information management console 4 is an operation terminal of the operation information management device 3 and is composed of a personal computer or the like.

  The operation information distribution device 1 is a server that generates and distributes operation information U including operation data S0 to S2 based on the distribution instruction signal S4. The operation information distribution apparatus 1 is communicably connected to an IP-VPN (virtual private network) L4, which is a public communication network, via a router 5.

  This train operation information distribution device 1 relays to a plurality of wireless terminals 8 by relaying a wireless communication base station 7 used for public mobile communication services by IP multicast communication via an IP-VPN (virtual private network) L4. Distribute information U.

  IP-VPN (Virtual Private Network) L4 is an IP network provided by ISP (Internet Service Provider) and uses a router with MLPS (Multi-Protocol Label Switching) to share the bandwidth among multiple users. In this connection, different LANs are connected.

  According to this IP-VPN, unlike the Internet opened to the general public, a communication network such as a dedicated line can be constructed, and security can be improved by a specific label technology and encryption technology. The advantage that the communication quality can be improved by the band guarantee technique is obtained.

  Of course, what can be adopted as the public communication network is not limited to the IP-VPN, and other IP networks such as an Internet VPN in which a VPN is built on the Internet can be used.

  The wireless communication base station 7 is connected to the IP-VPN (virtual private network) L4 via the router 6 so as to be communicable. The radio communication base station 7 is a communication facility owned by a telecommunications carrier that handles public mobile communication services, that is, mobile phone services, and includes a public radio communication network including antenna devices installed at multiple points. Usually, communication is performed with the mobile phone 9 owned by the service subscriber via L5.

  The characteristic part of the present invention is that IP multicast distribution is performed to a plurality of wireless terminals 8 by using the existing wireless communication base station 7 and by a router 6 having an IP multicast function.

  The router 6 is equipped with IGMP (Internet Group Management Protocol) defined in RFC1112 or the like. Specifically, the router 6 processes participation and withdrawal of the wireless terminal 8 serving as a host by joining and leaving the multicast group G by sending and receiving messages such as queries and membership reports, and creates a management table for the multicast group G. When the router 6 receives the packet of the operation information U addressed to the multicast group G transmitted from the operation information distribution device 1, the router 6 generates a copy of the packet for all the wireless terminals 8 belonging to the multicast group G according to the management table. The data is transmitted to each wireless terminal 8 via the wireless communication base station 7 and the public wireless communication network L5.

  Here, the packet of the operation information U addressed to the multicast group G is a multicast packet in which the first 3 (Byte) of the destination address (DA) of the received packet is 01-00-5E (h). This is performed by using a group address included in the destination IP address. At this time, a common group address is set for all the wireless terminals 8 belonging to the multicast group G.

  Due to the nature of this IP multicast communication, not only the packet of the operation information U can be prevented from being distributed to the mobile phone 9 of other subscribers, but also the operation information U from the operation information distribution device 1 to the router 6. The effect is that the occupied bandwidth is greatly reduced. In particular, since the moving image data transmitted from the camera device 20 has a large capacity, the advantage of using IP multicast communication is great. In addition, drivers and station staff can obtain operation information that could only be obtained by voice with conventional railroad radio in real time by using moving image information, and work efficiency can be confirmed by visually confirming the situation at the site. Can be greatly improved.

  Since the train operation information distribution device 1 according to the present invention acquires the operation information U from the operation management device 2, it can obtain accurate information in a timely manner. Since the operation information U is distributed to a plurality of wireless terminals 8 through the public communication network L4 and relayed to the wireless communication base station 7 provided for the public mobile communication service, the cost of communication facilities can be reduced. At the same time, the driver, station staff, and the like can receive the operation information U by the portable wireless terminal 8 regardless of their location.

  Furthermore, as a characteristic part of the present invention, since the train operation information distribution device 1 distributes the operation information U by IP multicast communication, the operation information U is transmitted only once to the router 6 having the IP multicast function. This can be distributed to all wireless terminals 8 belonging to the same group G. Therefore, since the distribution does not impose the communication band of the public communication network L4, a large amount of information such as an image can be efficiently distributed to the wireless terminal 8 with a small transmission capacity. In addition, since IP, which is the most general-purpose protocol, is used, information can be received by a general-purpose wireless terminal 8 such as a PDA or a netbook personal computer, and the equipment cost can be reduced.

  Next, an IP multicast distribution method according to the present invention will be described. FIG. 2 is a network configuration diagram for realizing the IP multicast distribution method according to the present invention. Here, portions that are the same as those in FIG. 1 described above are denoted by the same reference numerals and description thereof is omitted.

  The IP multicast distribution method according to the present invention is a method of distributing train operation information U to a plurality of wireless terminals 8 using the above-described train operation information distribution device 1 for each railway operator. Here, as an example, train operation information distribution apparatuses 11 to 13 owned by company A, company B, and company C, which are railway operators, are connected to the same IP-VPN (virtual private network) via routers 51 to 53. An example is given in which each operation information U1 to U3 is connected to L4 and distributed to its own wireless terminals 81 to 83, respectively.

  In this network, a common group address is assigned to each of the wireless operators 81 to 83 for each railway operator, and each of the wireless terminals 81 to 83 belongs to the multicast groups G1 to G3.

  For example, the wireless terminal 81 has 172.16. XXX. XXX (X is an address part unique to the terminal, the same applies hereinafter) to the wireless terminal 82 172.17. XXX. The address XXX is assigned to the wireless terminal 83 as 172.18. XXX. Assume that an address XXX is assigned. In this case, when receiving the multicast packet whose destination group address is 172.17, the router 6 recognizes this as the operation information U2 addressed to the group G2, and transmits it to all the radio terminals 82 of the group G2. . At this time, all the wireless terminals 81 and 83 belonging to the other groups G1 and G3 and the general mobile phone 9 do not receive the packet of the operation information U2. For this reason, in this network, a plurality of railway operators can share the public communication lines L4 and L5 and suitably distribute the operation information U1 to U3.

  According to the IP multicast distribution method according to the present invention, a common group address is assigned to each of the plurality of wireless terminals 81 to 83 for each railway operator, so that the destinations of the train operation information U1 to U3 are distinguished according to this group address, Train operation information U1 to U3 can be distributed to a plurality of wireless terminals 81 to 83 for each railway company. Therefore, the train operation information U1 to U3 of other railway operators is not erroneously distributed to the wireless terminals 81 to 83 belonging to a certain railway operator. The IP multicast distribution method according to the present invention is particularly effective when applied to urban stations where routes of a plurality of railway operators are concentrated.

Finally, the train operation information distribution method according to the present invention will be described. In the train operation information distribution method according to the present invention, the train operation information distribution device 1 acquires the operation information U from the operation management device 2, and the train operation information distribution device 1 performs IP multicast communication via the public communication network L4. And relaying the wireless communication base station 7 provided for the public mobile communication service to distribute the operation information U to the plurality of wireless terminals 8. Here, the public communication network L4 is preferably an IP-VPN.

  According to the train operation information distribution method and the IP multicast distribution method according to the present invention, the same operation and effect as the above-described train operation information distribution device 1 have the same invention-specific matters.

  The IP multicast distribution of the train operation information distribution apparatus 1 described so far is not limited to a wireless terminal, but can also be a wired terminal such as a desktop personal computer via a wired public line. Needless to say.

  Although the contents of the present invention have been specifically described above with reference to the preferred embodiments, it is obvious that those skilled in the art can take various modifications based on the basic technical idea and teachings of the present invention. It is.

1,11-13 Train operation information distribution device 2 Operation management device 7 Wireless communication base station 8, 81-83 Wireless terminal U, U1-U3 Operation information

Claims (7)

Generate operation information based on the operation data on the train operation management device and the distribution instruction signal supplied from the operation information management device ,
Via a public communication network, by IP multicast communication, relay to a wireless communication base station that provides a public mobile communication service, to a plurality of wireless terminals belonging to a group to which the operation information should be distributed among a plurality of multicast groups Delivering the operation information;
Train operation information distribution device. The train operation information distribution device according to claim 1,
The public communication network is IP-VPN, and the operation information is IP multicast distributed through a router having an IP multicast function connected to the IP-VPN.
Train operation information distribution device. The train operation information distribution device according to claim 2 ,
The plurality of wireless terminals belong to one of the plurality of multicast groups according to an assigned group address,
The router recognizes the multicast group that is a distribution destination of the operation information based on the group address of the received operation information, and distributes the operation information to the wireless terminals belonging to the recognized multicast group.
Train operation information distribution device. An IP multicast distribution method that distributes the train operation information to the plurality of wireless terminals using the train operation information distribution device according to claim 1, for each railway operator,
For each railway operator, assign a common group address to the plurality of wireless terminals.
IP multicast distribution method. An operation information management device generating the distribution instruction signal based on operation data supplied from the train operation management device;
A train operation information distribution device generating operation information based on a distribution instruction signal supplied from the operation information management device;
The train operation information distribution device relays a wireless communication base station provided for public mobile communication service by IP multicast communication through a public communication network, and the operation information should be distributed among a plurality of multicast groups. Delivering the operation information to a plurality of wireless terminals belonging to a group,
Train operation information distribution method. The train operation information distribution method according to claim 4,
The public communication network is IP-VPN, and the operation information is IP multicast distributed through a router having an IP multicast function connected to the IP-VPN.
Train operation information distribution method. A train operation management system including an operation information distribution device, a train operation management device, and an operation information management device,
The train operation management device transmits a plurality of operation data to the operation information management device,
The operation information management device generates a distribution instruction signal that organizes the plurality of operation data based on operation schedule information, and distributes the generated distribution instruction signal together with the operation data to the operation information distribution device,
The operation information distribution device is described in any one of claims 1 to 3, and generates the operation information based on the distribution instruction signal.
Train operation management system.

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