JP6826854B2 - Wireless system of wireless train control system - Google Patents

Description

The present invention relates to a wireless system for a wireless train control system in a railway.

Conventionally, there has been known a wireless train control system that uses radio to communicate control information related to safety between the ground and the vehicle on a railway (see Non-Patent Document 1). As shown in FIG. 1, the wireless train control system 1 is roughly classified into a ground system 2 and an on-board system 3 (see Non-Patent Document 2). The ground system 2 is installed on the ground and has a command center device 21, a ground device 22, a radio base station 4, and the like. The on-vehicle system 3 is installed on the vehicle and has an on-vehicle control device 31, an on-vehicle radio station 5, and the like. The command center device 21 is a device that monitors and manages train operation in a controlled line section (see Annex B of Non-Patent Document 2). The ground device 22 is a device that controls trains in a line section to be controlled and controls such as a rolling device on the ground side. The on-board control device 31 is a device that monitors and controls the train to be controlled, and is connected to the ground device 22 via the wireless system 6. The radio system 6, also called a train radio system, is a system that provides radio data transmission between the ground device 22 and the on-board control device 31, and includes a radio base station 4 and an on-board radio station 5. The radio base station 4 is connected to the terrestrial device 22 via a terrestrial transmission line, and wirelessly performs data communication with the on-board radio station 5. The on-board radio station 5 is connected to the on-board control device 31 and wirelessly performs data communication with the radio base station 4.

In the radio system 6, one or more radio base stations 4 are arranged along the radio line according to the reach of the radio, and interface with the ground device via the ground transmission line (see 4.2 of Non-Patent Document 2). When a plurality of radio base stations 4a and 4b are arranged along the railway line, the radio system 6 is installed between the terrestrial radio device 41 and the on-board radio device 51 when the train passes through the area boundary of the radio base station 4. Handover is performed so that communication can be performed continuously.

Conventionally, wireless systems that perform handover have been known in railways. In such a wireless system, for example, the radio base station is switched when the position of the antenna of the on-board radio station exceeds the handover point (see, for example, Patent Document 1). Further, there is known a wireless system that communicates information via a wireless base station beyond the handover point when the wireless communication unit (on-vehicle wireless station) in the vehicle exceeds the handover point (see Patent Document 2). In any wireless system, the handover is performed at the handover point. The handover point is an area (overlap) where the communicable area of the radio base station before the handover and the communicable area of the radio base station of the handover destination overlap so that the position is the same regardless of the operating direction of the train. ) Is set (see FIG. 3 of Patent Document 1 and FIG. 3 of Patent Document 2).

In the wireless system 6, data is divided and stored in a plurality of slots for communication (see, for example, Patent Document 3). This slot is also called a time slot because data communication is time division. Slots are communication resources (resources) required for data communication. In the wireless system 6 of the wireless train control system 1, the data to be communicated includes control information related to safety. Therefore, as shown in FIG. 4, when the slot of the radio base station 4b of the handover destination is reserved at the handover preliminary point P2 and the handover is performed before the train T reaches the handover point P1. , Slots are reliably allocated for data communication.

The conventional handover processing in the wireless system 6 will be described. The radio base station 4 and the on-board radio station 5 have a terrestrial radio device 41 and an on-board radio device 51, respectively, as data communication transmission / reception devices (see FIG. 1). The radio base station 4 and the on-board radio station 5 have a base device 42 and an on-board device 52, respectively, as devices that provide a handover function.

A conventional handover sequence in the wireless system 6 is shown in FIG. The base devices 42 (42a, 42b) of the radio base station 4 have train position information. When the train T reaches a predetermined handover preliminary point P2, the base device 42a of the radio base station 4a before the handover communicates with the radio base station 4b of the handover destination, that is, the on-board radio station 5 next. Determine the terrestrial radio device 41b. Then, the base device 42a requests the next terrestrial radio device 41b to reserve a slot, and also delivers the key for communication to the terrestrial radio device 41b. Then, when the slot reservation is completed, the base device 42a transmits the slot reservation completion and the parameters for communicating with the next terrestrial radio device 41b to the on-board device 52 of the on-board radio station 5.

After receiving the notification of the slot reservation completion, the on-board device 52 notifies the terrestrial radio device 41a before the handover of the end of communication when the own train T reaches the handover point P1, and next Communication is started with the terrestrial radio device 41b of the handover destination at the timing. That is, the handover is performed from the radio base station 4a to the radio base station 4b. The on-board radio device 51 does not play a role in this handover sequence, and the description of “control communication” in FIG. 5 is communication for controlling the timing of the handover.

The above handover processing is described at the level of the radio base station 4 and the on-board radio station 5 as follows. The radio base station 4a has the position information of the train T, and when the train T reaches the preset handover preliminary point P2, the radio base station 4b of the handover destination is requested to reserve the slot, and the slot is set. When the reservation is completed, the on-board radio station 5 is notified of the slot reservation completion. The on-board radio station 5 communicates with the radio base station 4a before the handover (during communication) when the own train T reaches the handover point P1 after receiving the notification of the slot reservation completion. Switch to communication with the radio base station 4b of the handover destination.

However, in such a handover process, after the train T reaches the handover preliminary point P2, the slot of the handover destination radio base station 4b is reserved until the handover point P1 is reached, and the slot is reserved. Since the slot is not used for communication, the utilization efficiency of the slot, which is a communication resource, is not good.

Further, for example, when an accident occurs and the train is stopped in a dumpling state, the train is concentrated at a certain point, so that the slot reservation request is concentrated on the next radio base station 4b. Further, since the train is stopped, even if the slot of the next terrestrial radio device 41b is reserved, it is unlikely that many of the reserved slots will be used for communication for a while. Therefore, the utilization efficiency of the slot, which is a communication resource, is not remarkably good.

Japanese Unexamined Patent Publication No. 2015-137079 JP-A-2015-139205 Japanese Unexamined Patent Publication No. 2014-50038

JIS E 3801-1: 2009 "Wireless Train Control System-Part 1: General Requirements and Functional Requirements" JIS E 3801-2: 2010 "Wireless Train Control System-Part 2: System Requirements"

The present invention solves the above-mentioned problems, and improves the utilization efficiency of communication resources in the handover processing in the wireless system of a wireless train control system that wirelessly communicates control information for controlling a train. The purpose.

The wireless system of the present invention is a wireless system of a wireless train control system that wirelessly communicates control information for controlling a train, and includes a plurality of wireless base stations and the wireless base station provided on a vehicle. It is provided with an on-board radio station that communicates data including the control information between the two, the data is divided and stored in a plurality of slots for communication, and the radio base station has train position information. Then, when the train reaches the preset switching permission start point, the slot reservation is requested to the radio base station of the handover destination, and when the slot reservation is completed, the slot reservation is completed to the on-board radio station. When the on-board radio station receives the transmission that the reservation of the slot is completed, the communication with the radio base station being communicated is carried out regardless of the position of the own train. It is characterized by switching to communication with the radio base station.

In this wireless system, if the on-board radio station does not receive notification of slot reservation completion after the train reaches the switching permission start point, the train operates in the communicable area of the radio base station being communicated. It is preferable to control the own train so that it does not come out.

In this wireless system, the switching permission start point is preferably set at the end of the area on the side where the train enters in the communicable area of the radio base station of the handover destination.

In this wireless system, when the wireless base station of the handover destination is requested to reserve a slot, the wireless base station transmits a key used for data encryption and decryption to the wireless base station of the handover destination. Is preferable.

According to the radio system of the present invention, when the on-board radio station receives the notification of the slot reservation completion, it hands the communication with the radio base station in communication without the condition of the position of its own train. Since the communication is switched to the wireless base station of the over-destination destination, the time when the reserved slot is not used is shortened, and the utilization efficiency of the slot, which is a communication resource, is improved.

Block configuration diagram of wireless train control system. The area design drawing of the wireless system which concerns on one Embodiment of this invention. The sequence diagram which shows the handover sequence in the wireless system. Area design drawing of a conventional wireless system. The sequence diagram which shows the handover sequence in the conventional wireless system.

A wireless system according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. As shown in FIG. 1, the wireless train control system 1 has the same configuration as the conventional wireless train control system defined in the Japanese Industrial Standards (Non-Patent Document 1 and Non-Patent Document 2), and is wireless. It has a system 6. The wireless system 6 has the same hardware configuration as the conventional wireless system described above, and the handover process is different. The same reference numerals are given to the parts equivalent to those of the conventional wireless system.

The wireless train control system 1 wirelessly communicates control information for controlling a train. The radio system 6 includes a plurality of radio base stations 4 (4a, 4b) and an on-board radio station 5. The on-board radio station 5 communicates data including control information with the radio base station 4. The data is divided and stored in a plurality of slots for communication. The radio base station 4 has train position information.

Each configuration of the wireless train control system 1 will be described in more detail. The command center device 21 is a device that monitors and manages train operation in a controlled line section (see Annex B of Non-Patent Document 2). The ground device 22 is a device that controls trains in a line section to be controlled and controls such as a rolling device on the ground side. The ground device 22 has hardware such as a processing device and a storage device, and operates by executing software.

The on-board control device 31 is a device that monitors and controls the train to be controlled, and is connected to the ground device 22 via the wireless system 6. The wireless system 6 is a device that provides wireless data transmission between the ground device 22 and the on-board control device 31. The radio base station 4 of the radio system 6 is connected to the ground device 22 via a ground transmission line. The on-board radio station 5 of the wireless system 6 is connected to the on-board control device 31 and wirelessly performs data communication with the radio base station 4.

Since the command center device 21, the ground device 22, and the radio base station 4 are installed on the ground, they are called the ground system 2. Since the on-vehicle control device 31 and the on-vehicle radio station 5 are installed on the vehicle, they are called an on-vehicle system 3.

In the present embodiment, since the data communication in the wireless system 6 is time-division, the slot is also called a time slot. Slots are communication resources (resources) required for data communication.

As shown in FIG. 2, the train T travels to the right in FIG. When the train T reaches the preset switching permission start point P, the radio base station 4a requests the radio base station 4b of the handover destination to reserve a slot.

When requesting the radio base station 4b of the handover destination to reserve a slot, the radio base station 4a transmits a key used for data encryption and decryption to the radio base station 4b.

Then, when the reservation of the slot of the radio base station 4b is completed, the radio base station 4a notifies the on-board radio station 5 of the completion of the slot reservation.

When the on-board radio station 5 receives the notification of the slot reservation completion, the on-board radio station 5 transmits the communication with the radio base station 4a being communicated with the radio base station 4a being communicated without the position of the own train T as a condition. Switch to communication with 4b.

If the on-board radio station 5 does not receive the notification of slot reservation completion after the own train T reaches the switching permission start point P, the own train T does not exit the communicable area of the radio base station 4a being communicated. Control your train so that.

The switching permission start point P is set at the end of the area on the side where the train enters in the communicable area of the radio base station 4b of the handover destination. The area end does not have to be a mathematically exact end, but is a substantial end of the communication area with accuracy in consideration of the train length, the position detection error of the train, and the like.

The handover process of the wireless system 6 will be described in more detail. The radio base station 4 and the on-board radio station 5 have a terrestrial radio device 41 (41a, 41b) and an on-board radio device 51, respectively, as data communication transmission / reception devices (see FIG. 1). The radio base station 4 and the on-board radio station 5 have a base device 42 (42a, 42b) and an on-board device 52, respectively, as devices that provide a handover function.

The base device 42 of the radio base station 4 has train position information. As shown in FIGS. 2 and 3, when the train T reaches the preset switching permission start point P, the base device 42a of the radio base station 4a before the handover has the radio base station 4b of the handover destination. That is, next, the terrestrial radio device 41b with which the on-board radio station 5 communicates is determined. Since the train T travels on the track in one direction of up or down, it is easy to determine which radio base station 4b is the handover destination radio base station 4, for example, the radio to be handed over. The order of the base stations 4 may be predetermined and stored in the base device 42 and the on-board device 52.

Then, the base device 42a requests the next terrestrial radio device 41b to reserve a slot via the base device 42b, and delivers a key for communication to the terrestrial radio device 41b. The key is an encryption key.

Then, when the slot reservation is completed, the base device 42a communicates with the on-board device 52 of the on-board radio station 5 via the terrestrial radio device 41a to complete the slot reservation and communicate with the next terrestrial radio device 41b. Communicate the parameters to do.

The on-board device 52 permits the own train T to leave the communicable area of the radio base station 4a being communicated and the own train T to enter the area communicating with the next radio base station 4b (next). Zone entry permission).

The on-board device 52 notifies the terrestrial radio device 41a before the handover of the end of communication without the condition of the position of the own train T, and notifies the terrestrial radio device 41b of the handover destination at the next timing. Start communication. That is, the handover is performed from the radio base station 4a to the radio base station 4b. The terrestrial radio device 41a before the handover releases the slot when notified of the end of communication. The on-board radio device 51 does not play a role in this handover sequence, and the description of “control communication” in FIG. 3 is communication for controlling the timing of the handover.

As an exception handling, when the own train T reaches the switching permission start point P and is not notified of the slot reservation completion, the on-board device 52 sets the communicable area of the radio base station 4a during communication to the own train T. Control the own train T so that That is, the on-board device 52 does not permit entry into the next zone. Such an exception occurs, for example, when an accident occurs and the trains are stopped in a dumpling state and slots cannot be reserved for all of these trains.

In the conventional handover process, the slot of the radio base station 4b of the handover destination is reserved until the train T reaches the handover point P1 after reaching the handover preliminary point P2, and the slot is reserved. The slot was not used for communication (see Figure 4). On the other hand, in the wireless system 6 of the present embodiment, when the slot of the radio base station 4b of the handover destination is reserved, the handover is performed regardless of the position of the own train T, so that the slot is reserved. However, the time that the reserved slot is not used is shortened (see FIG. 2).

Specifically, in the conventional handover process, in the case of a conventional line, the handover preliminary point P2 is set to 1 km before the handover point P1. Therefore, assuming that the maximum speed of the train is 120 km / h, the train After T reaches the preliminary handover point P2, the time until the handover is performed is about 30 seconds. This time is even longer when the train stops. For a long time, the slot of the reserved handover destination radio base station 4b is not used for communication.

On the other hand, in the wireless system 6 of the present embodiment, the time from when the train T reaches the switching permission start point P until the handover is performed is the base device processing cycle, the wireless device transmission cycle, and the vehicle processing cycle. Estimated from, the maximum is 10 seconds and the average is about 7 seconds. Therefore, the time during which the reserved slot is not used for communication is one-third or less as compared with the conventional case.

As described above, according to the radio system 6 according to the present embodiment, when the on-board radio station 5 receives the notification of the completion of the slot reservation, the radio base station 4a during communication is not conditioned on the position of the own train T. Since the communication with is switched to the communication with the radio base station 4b of the handover destination, the slot is reserved, the time when the reserved slot is not used is shortened, and the slot which is a communication resource is used. Efficiency is improved.

If the on-board radio station 5 does not receive the notification of the slot reservation completion after the own train T reaches the switching permission start point P, the own train T does not leave the communicable area of the radio base station 4a during communication. Since the own train T is controlled in this way, it is possible to prevent the control information for controlling the train T from being unable to communicate.

Since the switching permission start point P is set at the end of the area on the side where the train T enters in the communicable area of the radio base station 4b of the handover destination, the area where the handover processing can be performed becomes large.

When the wireless base station 4a requests the wireless base station 4b of the handover destination to reserve a slot, the wireless base station 4a transmits a key used for data encryption and decryption to the wireless base station 4b, so that communication security is ensured. ..

The present invention is not limited to the configuration of the above embodiment, and various modifications can be made without changing the gist of the invention. For example, the train T may travel to the left in FIG. 2 and a handover may be performed from the radio base station 4b to the radio base station 4a. Further, the number of radio base stations 4 may be three or more.

1 Wireless train control system 4, 4a, 4b Radio base stations 43a, 43b Communicable area 5 On-board radio station 6 Radio system P Switching permission start point T train

Claims (4)

It is a wireless system of a wireless train control system that wirelessly communicates control information for controlling trains.
With multiple radio base stations
It is provided with an on-vehicle radio station provided on the vehicle and communicating data including the control information with the radio base station.
The data is divided and stored in a plurality of slots for communication.
The radio base station has the position information of the train, and when the train reaches the preset switching permission start point, the radio base station of the handover destination is requested to reserve the slot, and the slot reservation is completed. At that time, notify the on-board radio station that the slot reservation has been completed,
When the on-board radio station receives the transmission of the slot reservation completion, the on-board radio station performs communication with the radio base station being communicated with the radio base station being handed over, regardless of the position of its own train. A wireless system characterized by switching to communication with. If the on-board radio station does not receive notification of slot reservation completion after the train reaches the switching permission start point, the on-board radio station prevents the train from leaving the communicable area of the radio base station being communicated. The wireless system according to claim 1, wherein the train is controlled. The switching permission start point according to claim 1 or 2, wherein the switching permission start point is set at the end of the area on the side where the train enters in the communicable area of the radio base station of the handover destination. Wireless system. The radio base station is characterized in that when requesting the radio base station of the handover destination to reserve a slot, the key used for data encryption and decryption is transmitted to the radio base station of the handover destination. The wireless system according to any one of claims 1 to 3.

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