JP7333259B2 - Railway wireless communication terminal and railway wireless communication method - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to railway wireless communication for outputting position information of own and other vehicles for collision prevention.

Patent documents 1, 2 and the like disclose railroad wireless communication for outputting position information of own and other vehicles for collision prevention. In Patent Literatures 1 and 2, each of a plurality of vehicles such as a maintenance vehicle can output position information of other vehicles by communicating position information of its own vehicle.

JP 2001-347946 A JP 2008-247216 A

FIG. 1 shows the problems to be solved by the conventional railway wireless communication method. In the upper part of FIG. 1, the distance between the vehicles C1 and C2 is within the communicable range of commercial wireless communication of the time division multiplex method. Then, each of the vehicles C1 and C2 can (1) communicate the position information of the own vehicles C1 and C2, and (2) output the position information of the other vehicles C2 and C1 for collision prevention. (3) It is possible to obtain position information displays D1 and D2 by wireless communication for professional use with high real-time performance.

In the lower part of FIG. 1, the vehicles C1 and C2 are approaching from a distance, and the distance between the vehicles C1 and C2 is outside the communicable range of the time-division multiplexing wireless communication for business use. Then, each of the vehicles C1 and C2 can (1) not communicate the position information of the own vehicles C1 and C2 and (2) output the position information of the other vehicles C2 and C1 for collision prevention. (3) It is not possible to obtain the position information displays D1 and D2 by professional wireless communication with high real-time performance.

As an intermediate case between the upper and lower stages of FIG. 1, there is a case where the distance between vehicles C1 and C2 is near the communicable range of commercial wireless communication of time division multiplexing. Then, in each of the vehicles C1 and C2, (1) repeating the success and failure of communication of the position information of the own vehicles C1 and C2, (2) repeating the success and failure of outputting the position information of the other vehicles C2 and C1, ( 3) It is not possible to stably obtain position information displays D1 and D2 by professional wireless communication with high real-time performance.

Therefore, in order to solve the above-described problem, the present disclosure provides that the distance between a plurality of vehicles performing time division multiplexing inter-terminal wireless communication is outside the communicable range of time division multiplexing inter-terminal wireless communication. It is an object of the present invention to stably obtain positional information display of other vehicles even when the vehicle is in the vicinity of a communicable range of wireless communication between terminals of a time division multiplex system.

In order to solve the above problems, position information of own vehicle is transmitted using base station radio communication and terminal-to-terminal radio communication of time division multiplexing, and position information of other vehicles is transmitted using base station radio communication and time division multiplexing. Receiving is performed using multiplexing terminal-to-terminal wireless communication. Even if the location information of other vehicles cannot be received using time division multiplexing wireless communication between terminals, the location information of other vehicles can be received using base station wireless communication. Instead of the position information of other vehicles received using communication, the position information of other vehicles received using base station wireless communication is output.

Specifically, the present disclosure relates to a railway wireless communication terminal mounted on an own vehicle that performs wireless communication with other vehicles, in which position information of the own vehicle is transmitted to a terminal of base station wireless communication and time division multiplexing. a location information communication unit that transmits the location information of the other vehicle using base station wireless communication and time-division multiplexed wireless communication between terminals; When the location information of the other vehicle cannot be received using division multiplexing wireless communication between terminals, the location information communication unit receives the location information of the other vehicle using time division multiplexing wireless communication between terminals. Alternatively, the railway wireless communication terminal further comprises a position information output unit for outputting the position information of the other vehicle received by the position information communication unit using base station wireless communication.

Specifically, the present disclosure is a railway wireless communication method in which a plurality of vehicles perform wireless communication, in which each vehicle transmits position information of its own vehicle to base station wireless communication and time-division multiplexing terminal-to-terminal wireless communication. a position information communication procedure for transmitting position information of other vehicles using base station radio communication and time division multiplexing inter-terminal radio communication; The location information of the other vehicle received using time division multiplexing wireless communication between terminals in the location information communication procedure when the location information of the other vehicle cannot be received using time division multiplexing wireless communication between terminals. and a position information output procedure for outputting the position information of the other vehicle received using base station radio communication in the position information communication procedure instead of the position information communication procedure.

According to these configurations, even when the distance between a plurality of vehicles performing time division multiplexing wireless communication between terminals is outside the communicable range of time division multiplexing wireless communication between terminals, the time division multiplexing method can be used. Even in the vicinity of the communicable range of inter-terminal wireless communication, it is possible to stably obtain position information display by base station wireless communication, although the real-time performance is somewhat low.

Further, according to the present disclosure, when the position information output unit cannot receive the position information of the other vehicle using time-division multiplexing inter-terminal wireless communication, the position information communication unit Prior to the position information of the other vehicle received using station radio communication, the position information communication unit receives the position information of the other vehicle last using time division multiplexing radio communication between terminals for a provisional time. This wireless communication terminal for railways is characterized by outputting to

Further, in the present disclosure, in each vehicle, in the position information output procedure, when the position information of the other vehicle cannot be received using time division multiplexing inter-terminal wireless communication in the position information communication procedure, the position information Prior to the position information of the other vehicle received using base station radio communication in the communication procedure, the position information of the other vehicle last received using time division multiplexing radio communication between terminals in the position information communication procedure. A railway wireless communication method characterized by outputting during a provisional time.

According to these configurations, even when the distance between a plurality of vehicles performing time-division multiplexing wireless communication between terminals begins to fall outside the communicable range of time-division multiplexing wireless communication between terminals, real-time performance can be achieved. It is possible to provisionally obtain location information display by wireless communication between terminals with a high .

Further, according to the present disclosure, when the position information output unit is able to receive the position information of the other vehicle again using time-division multiplexing wireless communication between terminals, the position information communication unit instead of the location information of the other vehicle received by using base station wireless communication, the location information of the other vehicle first received by the location information communication unit using time division multiplexing wireless communication between terminals This wireless communication terminal for railways is characterized by outputting to

Further, in the present disclosure, in each vehicle, in the position information output procedure, when the position information of the other vehicle can be received again using time division multiplexing inter-terminal wireless communication in the position information communication procedure, the Instead of the position information of the other vehicle received using base station radio communication in the position information communication procedure, the position information of the other vehicle first received using time-division multiplexing terminal-to-terminal radio communication in the position information communication procedure. This wireless communication method for railways is characterized by outputting position information immediately.

According to these configurations, when the distance between a plurality of vehicles performing time-division multiplexing wireless communication between terminals begins to fall within the communicable range of time-division multiplexing wireless communication between terminals, real-time performance can be achieved. It is possible to immediately obtain location information display by wireless communication between terminals with a high

In this way, the present disclosure provides time-division multiplexing even when the distance between a plurality of vehicles performing time-division multiplexing wireless communication between terminals is outside the communicable range of time-division multiplexing wireless communication between terminals. It is possible to stably obtain positional information display of other vehicles even when it is near the communicable range of inter-terminal wireless communication of the system.

1 is a diagram illustrating a problem to be solved by a conventional railway wireless communication method; FIG. Fig. 3 shows the solution of the railway wireless communication method of the present disclosure; 1 is a diagram showing a configuration of a railway wireless communication terminal of the present disclosure; FIG. FIG. 2 is a diagram showing the procedure of the railway wireless communication method of the present disclosure; FIG. 2 is a diagram showing the procedure of the railway wireless communication method of the present disclosure;

Embodiments of the present disclosure will be described with reference to the accompanying drawings. The embodiments described below are examples of implementing the present disclosure, and the present disclosure is not limited to the following embodiments.

A solution for the railway wireless communication method of the present disclosure is shown in FIG. In the upper part of FIG. 2, the distance between the vehicles C1 and C2 is within the communicable range of commercial wireless communication of the time division multiplex system. Then, each of the vehicles C1 and C2 uses (1) time-division multiplexing wireless communication for business use and wireless communication via the base station B to obtain the position information of the own vehicle C1 and C2 for collision prevention. (2) position information of other vehicles C2 and C1 can be output using time-division multiplexed commercial radio communication without using radio communication via base station B; 3) It is possible to obtain position information displays D1 and D2 by professional wireless communication with high real-time performance.

In the lower part of FIG. 2, the vehicles C1 and C2 are approaching from a distance, and the distance between the vehicles C1 and C2 is outside the communicable range of commercial wireless communication of the time division multiplex system. Then, in each vehicle C1, C2, for collision prevention, (1) position information of own vehicle C1, C2 is obtained by using wireless communication via base station B without using time division multiplexing wireless communication for business use. (2) can output the position information of other vehicles C2 and C1 using wireless communication via the base station B without using commercial wireless communication of time division multiplexing, (3) The position information displays D1 and D2 can be obtained by wireless communication via the base station B, although the real-time performance is rather low.

As an intermediate case between the upper stage and the lower stage in FIG. 2, the distance between the vehicles C1 and C2 may be near the communicable range of commercial wireless communication of time division multiplexing. Then, each of the vehicles C1 and C2 uses either (1) time-division multiplexing wireless communication for business use or wireless communication via the base station B to transmit position information of the own vehicle C1 or C2. (2) Failure to successfully output the location information of other vehicles C2 and C1 using either time-division multiplexing wireless communication for business use or wireless communication via base station B. (3) stably obtain location information displays D1 and D2 by either time-division multiplexing wireless communication for professional use or wireless communication via base station B (regardless of whether real-time performance is high or low); can be done.

FIG. 3 shows the configuration of the railway wireless communication terminal of the present disclosure. The procedure of the railway wireless communication method of the present disclosure is shown in FIGS. 4 and 5. FIG. The railway wireless communication terminal R is mounted on each of the vehicles C1 and C2, and is composed of a slot arbitration section 1, a position information communication section 2, and a position information output section 3. FIG.

In each of the vehicles C1 and C2, the slot arbitration unit 1 arbitrates the different transmission slot numbers N1 and N2 using time-division multiplexing wireless communication for business use (steps S1-1 and S2-1). 4 and 5, broken line arrows in the left-right direction of the paper surface indicate time-division multiplexing wireless communication for business use. 4 and 5, the solid-line arrows in the left-to-right direction of the paper surface indicate LTE wireless communication.

In steps S1-1 to S1-4, SB-1, SB-2, and S2-1 to S2-4, the distance between the vehicles C1 and C2 is within the communicable range of commercial wireless communication of the time division multiplex method. is.

In the vehicle C1, the location information communication unit 2 transmits the location information P1 of the own vehicle C1 using LTE wireless communication and time-division multiplexing wireless communication for business use (step S1-2). The base station B unicast-receives and multicast-transmits the location information P1 of the vehicle C1 using LTE wireless communication (step SB-1). In the vehicle C2, the position information communication unit 2 can receive the position information P1 of the other vehicle C1 using LTE wireless communication, and can also receive the position information P1 using time division multiplexing wireless communication for business use. (Step S2-2).

In the vehicle C2, the location information communication unit 2 transmits the location information P2 of the own vehicle C2 using LTE wireless communication and time-division multiplexing wireless communication for business use (step S2-3). The base station B unicast-receives and multicast-transmits the location information P2 of the vehicle C2 using LTE wireless communication (step SB-2). In the vehicle C1, the location information communication unit 2 can receive the location information P2 of the other vehicle C2 using LTE wireless communication, and can also receive the location information P2 using time division multiplexing wireless communication for business use. (Step S1-3).

In each of the vehicles C1 and C2, the position information output unit 3 outputs the position information P2 and P1 of the other vehicles C2 and C1 received by the position information communication unit 2 using LTE wireless communication. The position information P2, P1 of the other vehicles C2, C1 received using the multiplex system wireless communication for business use is selectively output (steps S1-4, S2-4).

Thus, when the distance between the vehicles C1 and C2 performing time division multiplexing business wireless communication is within the communicable range of the time division multiplexing business wireless communication, a high real-time business wireless communication is possible. Position information displays D1 and D2 can be obtained by wireless communication.

In steps S1-5 to S1-8, SB-3, SB-4, and S2-5 to S2-8, the distance between the vehicles C1 and C2 is out of the communicable range of commercial wireless communication of the time division multiplex method. is.

In the vehicle C1, the location information communication unit 2 transmits the location information P1 of the own vehicle C1 using LTE wireless communication and time-division multiplexing wireless communication for business use (step S1-5). The base station B unicast-receives and multicast-transmits the location information P1 of the vehicle C1 using LTE wireless communication (step SB-3). In the vehicle C2, the location information communication unit 2 can receive the location information P1 of the other vehicle C1 using LTE wireless communication, and can also receive the location information P1 using time division multiplexing wireless communication for business use. Impossible (step S2-5).

In the vehicle C2, the location information communication unit 2 transmits the location information P2 of the own vehicle C2 using LTE wireless communication and time-division multiplexing wireless communication for business use (step S2-6). The base station B unicast-receives and multicast-transmits the location information P2 of the vehicle C2 using LTE wireless communication (step SB-4). In the vehicle C1, the location information communication unit 2 can receive the location information P2 of the other vehicle C2 using LTE wireless communication, and can also receive the location information P2 using time division multiplexing business wireless communication. Impossible (step S1-6).

In each of the vehicles C1 and C2, the position information output unit 3 outputs the position information P2 and P1 of the other vehicles C2 and C1 received by the position information communication unit 2 using LTE wireless communication. The location information P2, P1 of the other vehicles C2, C1 last received using the multiplex system wireless communication for business use is output during the provisional time (steps S1-7, S2-7). Here, the term "provisional time" refers to several times the frame period of business-use wireless communication using time division multiplexing.

After the provisional time elapses, in each of the vehicles C1 and C2, the position information output unit 3 outputs the position information P2 of the other vehicles C2 and C1 received by the position information communication unit 2 using time-division multiplexing wireless communication for business use, Instead of P1, the position information communication unit 2 outputs the position information P2, P1 of the other vehicles C2, C1 received using LTE wireless communication (steps S1-8, S2-8).

In this way, even when the distance between the vehicles C1 and C2 performing time division multiplexing business wireless communication is outside the communicable range of the time division multiplexing business wireless communication, the time division multiplexing service Even when it is in the vicinity of the communicable range of the LTE wireless communication, it is possible to stably obtain the position information displays D1 and D2 by the LTE wireless communication, although the real-time performance is slightly low.

Then, even when the distance between the vehicles C1 and C2 performing time-division multiplexing wireless communication for business use begins to fall outside the communicable range of the time-division multiplexing wireless communication for business use, a high real-time business wireless communication is possible. Position information displays D1 and D2 can be provisionally obtained by wireless communication.

In steps S1-9 to S1-11, SB-5, SB-6, and S2-9 to S2-11, the distance between the vehicles C1 and C2 is set within the communicable range of commercial wireless communication of time division multiplexing. is.

In the vehicle C1, the location information communication unit 2 transmits the location information P1 of the own vehicle C1 using LTE wireless communication and time-division multiplexing wireless communication for business use (step S1-9). The base station B unicast-receives and multicast-transmits the location information P1 of the vehicle C1 using LTE wireless communication (step SB-5). In the vehicle C2, the location information communication unit 2 can receive the location information P1 of the other vehicle C1 using LTE wireless communication, and can also receive it again using time-division multiplexing wireless communication for business use. Yes (step S2-9).

In the vehicle C2, the location information communication unit 2 transmits the location information P2 of the own vehicle C2 using LTE wireless communication and time-division multiplexing wireless communication for business use (step S2-10). The base station B unicast-receives and multicast-transmits the location information P2 of the vehicle C2 using LTE wireless communication (step SB-6). In the vehicle C1, the location information communication unit 2 can receive the location information P2 of the other vehicle C2 using LTE wireless communication, and can also receive it again using time division multiplexing wireless communication for business use. Yes (step S1-10).

In each vehicle C1, C2, the position information output unit 3 replaces the position information P2, P1 of the other vehicles C2, C1 received by the position information communication unit 2 using LTE wireless communication. The location information P2, P1 of the other vehicles C2, C1 received first using the division multiplexing business radio communication is immediately output (steps S1-11, S2-11).

Thus, when the distance between the vehicles C1 and C2 performing time division multiplexing business wireless communication is within the communicable range of the time division multiplexing business wireless communication, a high real-time business wireless communication is possible. Position information displays D1 and D2 can be obtained by wireless communication.

Then, when the distance between the vehicles C1 and C2 performing the time-division multiplexing wireless communication for business use begins to fall within the communicable range of the time-division multiplexing wireless communication for business use, a high real-time business wireless communication Position information displays D1 and D2 can be obtained immediately by wireless communication.

In the present embodiment, time-division multiplexing wireless communication for business use is applied as time-division multiplexing inter-terminal wireless communication, and LTE wireless communication is applied as base station wireless communication. As a modification, other wireless communication of time division multiplexing may be applied as the inter-terminal wireless communication of time division multiplexing, and other wireless communication may be applied as the base station wireless communication.

In the railway wireless communication terminal and railway wireless communication method of the present disclosure, the distance between a plurality of vehicles performing time division multiplexing wireless communication between terminals is outside the communicable range of time division multiplexing wireless communication between terminals. Even when it is near the communicable range of terminal-to-terminal wireless communication of time division multiplexing, it is possible to stably obtain position information display of other vehicles.

C1, C2: Vehicles D1, D2: Position information display B: Base station R: Railway radio communication terminal 1: Slot arbitration unit 2: Position information communication unit 3: Position information output unit

Claims (6)

A railway wireless communication terminal mounted on a vehicle that performs wireless communication with other vehicles,
transmitting the location information of the own vehicle using base station wireless communication and time division multiplexing inter-terminal wireless communication, and transmitting the location information of the other vehicle using base station wireless communication and time division multiplexing inter-terminal wireless communication; a location information communication unit that receives using communication;
When the position information communication unit cannot receive the position information of the other vehicle using time division multiplexing wireless communication between terminals, the position information communication unit receives the position information using time division multiplexing wireless communication between terminals. a position information output unit that outputs position information of the other vehicle received by the position information communication unit using base station wireless communication instead of the position information of the other vehicle;
with
The position information output unit is configured so that the position information communication unit can receive the position information of the other vehicle using base station wireless communication, while the position information communication unit can perform time division multiplexing wireless communication between terminals. When the position information of the other vehicle cannot be received using the Outputting the location information of the other vehicle last received using terminal-to-terminal wireless communication during the provisional time.
A railway wireless communication terminal characterized by: The location information output unit is configured so that the location information communication unit can receive the location information of the other vehicle using base station wireless communication, while the location information communication unit performs time division multiplexing inter-terminal wireless communication. When the position information of the other vehicle cannot be received using 2. The railway radio communication terminal according to claim 1, wherein said position information communication unit outputs position information of said other vehicle received by using base station radio communication. The location information output unit causes the location information communication unit to perform base station wireless communication when the location information communication unit is able to receive the location information of the other vehicle again using time division multiplexing inter-terminal wireless communication. The location information communication unit immediately outputs the location information of the other vehicle first received by using time-division multiplexing inter-terminal wireless communication instead of the location information of the other vehicle received using 3. The railway radio communication terminal according to claim 1 or 2, wherein: A railway wireless communication method in which a plurality of vehicles perform wireless communication,
Each vehicle transmits the location information of its own vehicle using base station wireless communication and time division multiplexing inter-terminal wireless communication, and transmits the location information of other vehicles to base station wireless communication and time division multiplexing terminal wireless communication. a location information communication procedure for receiving using wireless communication between
When each vehicle cannot receive the position information of the other vehicle by using time division multiplexing wireless communication between terminals according to the positional information communication procedure, it performs time division multiplexing wireless communication between terminals using the positional information communication procedure. a location information output procedure for outputting the location information of the other vehicle received using base station wireless communication in the location information communication procedure instead of the location information of the other vehicle received using the location information communication procedure;
are prepared in order ,
In each vehicle, in the position information output procedure, the position information of the other vehicle can be received using base station wireless communication in the position information communication procedure, while in the position information communication procedure, time division multiplexing is used. When the position information of the other vehicle cannot be received using inter-terminal wireless communication, prior to the position information of the other vehicle being received using base station wireless communication in the position information communication procedure, the position information communication procedure is timed. The location information of the other vehicle last received using division multiplexing wireless communication between terminals is output during the provisional time.
A railway radio communication method characterized by: In each vehicle, in the position information output procedure, the position information of the other vehicle can be received using base station wireless communication in the position information communication procedure, while in the position information communication procedure, time division multiplexing is used. When the location information of the other vehicle cannot be received using inter-terminal wireless communication, the position information of the other vehicle is received using time-division multiplexing wireless communication between terminals in the location information communication procedure after the interim time has elapsed. 5. The railroad radio communication method according to claim 4, wherein the position information of the other vehicle received using base station radio communication in the position information communication procedure is output instead of the position information. In each vehicle, in the positional information output procedure, when the positional information of the other vehicle can be received again using time-division multiplexing wireless communication between terminals in the positional information communication procedure, In place of the position information of the other vehicle received using station radio communication, the position information of the other vehicle first received using time division multiplexing radio communication between terminals in the position information communication procedure is immediately output. The railway wireless communication method according to claim 4 or 5, characterized in that:

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