Train radio communication system, base station control device, and base station

Abstract

To reduce the number of base stations installed in a station and the number of frequencies to be used.SOLUTION: A train radio communication system includes: first base stations B1-1, B1-2, B2-1, B2-2, B3-1, B3-2 that conduct radio communication using radio frequencies set for each of lines L1, L2, L3 which are radio communication areas; and a second base station B10 which is adjacent to the radio communication areas of the first base stations B1-1, B1-2, B2-1, B2-2, B3-1, B3-2 and has a radio communication area including two or more stop places in the lines L1, L2, L3. A train is mounted with an on-vehicle station that conducts radio communication with the first base stations B1-1, B1-2, B2-1, B2-2, B3-1, B3-2 in the radio communication areas of the first base stations B1-1, B1-2, B2-1, B2-2, B3-1, B3-2, and conducts radio communication with the second base station B10 in the radio communication area of the second base station B10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a train wireless communication system. [Background technology]

[0002] In train radio communication systems that use dedicated networks, a different radio frequency is assigned to each line (multiple radio frequencies may be assigned to one line), and radio communication is carried out between the base station and the on-board station installed on the train. In train radio communication systems that use radio-based train control and use dedicated networks, a radio frequency is assigned to each base station. In these train radio communication systems, at stations where multiple lines run through, a base station is installed for each line, with its communication area including the station, and each base station communicates with the on-board station using a unique radio frequency that does not overlap with other base stations.

[0003] As described in Patent Documents 1 and 2 below, in a train wireless communication system that uses a dedicated network, an on-board station mounted on a train moves along a line while changing the base station with which it communicates wirelessly. In addition, a base station installed on each line uses a frequency assigned to that line to perform wireless communication with the on-board station of a train traveling on that line.

[0004] Furthermore, Patent Document 3 listed below proposes a technology for increasing the number of on-board stations that can communicate with a single base station in a system in which one base station communicates with multiple on-board stations by using multiple communication slots (sometimes simply called "slots") that are created by time-dividing a frame of a certain length of time, by switching the slot for communication with that train from a slot dedicated to that train to a shared slot that can be shared by multiple on-board stations when it is expected that the train will not be running for a long period of time. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 4367284 [Patent Document 2] Patent No. 4884341 [Patent Document 3] Patent No. 5800768 Summary of the Invention [Problem to be solved by the invention]

[0006] As described above, in train radio communication systems that use dedicated networks, different radio frequencies are assigned to each line, so a station with multiple lines requires a large number of base stations to be installed. As a result, if the number of frequencies used at the station exceeds the number of trains that can be stationed at the station, the frequency usage efficiency is poor. When multiple lines with different communication methods pass through a single station, the number of base stations to be installed at the station and the number of frequencies used will be even greater.

[0007] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a train wireless communication system that can reduce the number of base stations installed at stations and the number of frequencies used. [Means for solving the problem]

[0008] The train wireless communication system according to the present disclosure includes a plurality of first base stations, each of which has a wireless communication area corresponding to a plurality of lines and which conducts wireless communication using a wireless frequency set for each line; a second base station, which is adjacent to the wireless communication areas of the plurality of first base stations and has a wireless communication area that includes two or more stations on the plurality of lines and which conducts wireless communication using a specific wireless frequency; and an on-board station mounted on a train, which conducts wireless communication with the first base station in the wireless communication area of ​​the first base station and conducts wireless communication with the second base station in the wireless communication area of ​​the second base station. [Effects of the Invention]

[0009] The train wireless communication system according to the present disclosure can reduce the number of base stations installed in stations and the number of frequencies used, thereby increasing the number of trains that can enter and stop at stations while suppressing an increase in the number of base stations installed in stations. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a configuration diagram of a train radio communication system according to a first embodiment. [Figure 2] 3 is a diagram illustrating an example of communication slots per communication cycle in the train wireless communication system according to the first embodiment. FIG. [Figure 3] FIG. 10 is a diagram showing a transition of a usage state of a communication slot in the train radio communication system according to the second embodiment. [Figure 4] FIG. 10 is a configuration diagram of a train radio communication system according to a third embodiment. [Figure 5] FIG. 11 is a configuration diagram of a train's wireless communication device in a train wireless communication system according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] <First Embodiment> Fig. 1 is a configuration diagram of a train wireless communication system according to embodiment 1. As shown in Fig. 1, this embodiment shows an example of a train wireless communication system for a railway having lines L1, L2, and L3. Note that communication performed in this train wireless communication system is assumed to be digital communication.

[0012] Lines L1, L2, and L3 have stops L1d, L2d, and L3d, respectively. Here, it is assumed that stops L1d, L2d, and L3d are located at the same station. However, stops L1d, L2d, and L3d may be located at different stations located within a small area (an area included in a wireless communication area B10a of a base station B10, which will be described later).

[0013] In the train wireless communication system according to the first embodiment, base stations B1-1, B1-2, B2-1, B2-2, B3-1, and B3-2 are installed as first base stations on lines L1, L2, and L3. A base station B10 is installed as a second base station at a station served by lines L1, L2, and L3.

[0014] Base station B1-1 and base station B1-2 are installed on line L1, with stop L1d in between. Base station B1-1 and base station B1-2 are controlled by a higher-level control device C1 and perform wireless communication with the on-board station of train T1 traveling on line L1. However, as shown in Figure 1, the wireless communication area B1-1a of base station B1-1 and the wireless communication area B1-2a of base station B1-2 do not include stop L1d, stop L2d, or stop L3d.

[0015] Base station B2-1 and base station B2-2 are installed on line L2, with stop L2d in between. Base station B2-1 and base station B2-2 are controlled by a higher-level control device C2 and perform wireless communication with the on-board station of train T2 traveling on line L2. However, as shown in Figure 1, the wireless communication area B2-1a of base station B2-1 and the wireless communication area B2-2a of base station B2-2 do not include stops L1d, L2d, and L3d.

[0016] Base station B3-1 and base station B3-2 are installed on line L3, with stop L3d in between. Base station B3-1 and base station B3-2 are controlled by a higher-level control device C3 and perform wireless communication with the on-board station of train T3 traveling on line L3. However, as shown in Figure 1, the wireless communication area B3-1a of base station B3-1 and the wireless communication area B3-2a of base station B3-2 do not include stops L1d, L2d, and L3d.

[0017] Base stations B10 are installed at stations served by lines L1, L2, and L3. Controlled by a higher-level control device C10, base stations B10 communicate wirelessly with onboard stations of trains T1, T2, and T3 while trains T1, T2, and T3 are stationed at the stations. As shown in FIG. 1 , a wireless communication area B10a of base station B10 includes stops L1d, L2d, and L3d, and is adjacent to a wireless communication area B1-1a of base station B1-1, a wireless communication area B1-2a of base station B1-2, a wireless communication area B2-1a of base station B2-1, a wireless communication area B2-2a of base station B2-2, a wireless communication area B3-1a of base station B3-1, and a wireless communication area B3-2a of base station B3-2.

[0018] In the train radio communication system of this embodiment, it is assumed that radio communication is performed using the same communication method on all lines. Furthermore, it is assumed that the radio frequencies used are set for each line, and a different radio frequency is assigned to each line. That is, base station B1-1, base station B1-2, base station B2-1, base station B2-2, base station B3-1, base station B3-2, and base station B10 each use the same communication method to perform radio communication with on-board stations at the radio frequencies set for each line. Therefore, the radio frequencies used by base station B1-1 and base station B1-2 installed on line L1, the radio frequencies used by base station B2-1 and base station B2-2 installed on line L2, and the radio frequencies used by base station B3-1 and base station B3-2 installed on line L3 are different from each other. The radio frequency used by base station B10 may be different from any of the radio frequencies used on lines L1, L2, and L3, or may be the same as any of the radio frequencies used on lines L1, L2, and L3.

[0019] 2 is a diagram showing an example of communication slots per communication cycle (i.e., per frame) in the train wireless communication system according to the first embodiment, and shows an example of reception slots on the base station side when the base station and on-board station communicate with each other. As shown in FIG. 2, one frame is divided into n communication slots SL1 to SLn, and the base station can receive communications from a maximum of n on-board stations in one communication cycle.

[0020] The operation of the train radio communication system according to the first embodiment will be described below.

[0021] First, a case will be described in which the radio frequency used by the base station B10 is different from the radio frequencies used on lines L1, L2, and L3. In this case, the same radio frequency for line L1 is used in the wireless communication area B1-1a of the base station B1-1 and the wireless communication area B1-2a of the base station B1-2, the same radio frequency for line L2 is used in the wireless communication area B2-1a of the base station B2-1 and the wireless communication area B2-2a of the base station B2-2, the same radio frequency for line L3 is used in the wireless communication area B3-1a of the base station B3-1 and the wireless communication area B3-2a of the base station B3-2, and a radio frequency different from those used in the other wireless communication areas is used in the wireless communication area B10a of the base station B10.

[0022] When train T1 traveling on line L1 moves from wireless communication area B1-1a or wireless communication area B1-2a to wireless communication area B10a to enter station L1d, it switches the radio frequency from the frequency for line L1 to the frequency for wireless communication area B10a at the boundary and continues communication. Also, when train T1 leaves station L1d and moves from wireless communication area B10a to wireless communication area B1-1a or wireless communication area B1-2a, it switches the radio frequency from the frequency for wireless communication area B10a to the frequency for line L1 at the boundary and continues communication.

[0023] Similarly, when train T2 traveling on line L2 moves from wireless communication area B2-1a or wireless communication area B2-2a to wireless communication area B10a to enter station L2d, it switches the radio frequency from the frequency for line L2 to the frequency for wireless communication area B10a at the boundary and continues communication. Also, when train T2 leaves station L2d and moves from wireless communication area B10a to wireless communication area B2-1a or wireless communication area B2-2a, it switches the radio frequency from the frequency for wireless communication area B10a to the frequency for line L2 at the boundary and continues communication.

[0024] Similarly, when train T3 traveling on line L3 moves from wireless communication area B3-1a or wireless communication area B3-2a to wireless communication area B10a to enter station L3d, it switches the radio frequency from the frequency for line L3 to the frequency for wireless communication area B10a at the boundary and continues communication. Also, when train T3 leaves station L3d and moves from wireless communication area B10a to wireless communication area B3-1a or wireless communication area B3-2a, it switches the radio frequency from the frequency for wireless communication area B10a to the frequency for line L3 at the boundary and continues communication.

[0025] In conventional train radio communication systems, three base stations had to be installed at a station where three lines passed through, but in the train radio communication system of embodiment 1, it is only necessary to install one base station B10 that is shared by the three lines that pass through the station, thereby reducing the number of base stations and the radio frequencies used by two.

[0026] Next, a case will be described in which the radio frequency used by the base station B10 is the same as the radio frequency used on any of the lines L1, L2, and L3. Here, it is assumed that the base station B10 uses the radio frequency used on the line L2.

[0027] In this case, the same radio frequency for line L1 is used in the wireless communication area B1-1a of base station B1-1 and the wireless communication area B1-2a of base station B1-2, the same radio frequency for line L2 is used in the wireless communication area B2-1a of base station B2-1, the wireless communication area B2-2a of base station B2-2 and the wireless communication area B10a of base station B10, and the same radio frequency for line L3 is used in the wireless communication area B3-1a of base station B3-1 and the wireless communication area B3-2a of base station B3-2.

[0028] When train T1 traveling on line L1 moves from wireless communication area B1-1a or wireless communication area B1-2a to wireless communication area B10a to enter station L1d, it switches the radio frequency from the frequency for line L1 to the frequency for line L2 at the boundary and continues communication. Also, when train T1 leaves station L1d and moves from wireless communication area B10a to wireless communication area B1-1a or wireless communication area B1-2a, it switches the radio frequency from the frequency for line L2 to the frequency for line L1 at the boundary and continues communication.

[0029] Train T2 traveling on line L2 continues communication without switching radio frequencies when moving from wireless communication area B2-1a or wireless communication area B2-2a to wireless communication area B10a to enter station L2d, and when leaving station L2d and moving from wireless communication area B10a to wireless communication area B2-1a or wireless communication area B2-2a.

[0030] Like train T1, when train T3 traveling on line L3 moves from wireless communication area B3-1a or wireless communication area B3-2a to wireless communication area B10a to enter station L3d, it switches the radio frequency from the frequency for line L3 to the frequency for line L2 at the boundary to continue communication. Also, when train T3 leaves station L3d and moves from wireless communication area B10a to wireless communication area B3-1a or wireless communication area B3-2a, it switches the radio frequency from the frequency for line L2 to the frequency for line L3 at the boundary to continue communication.

[0031] In this case, too, whereas previously three base stations had to be installed at the station, by installing one base station B10 that is shared by the three lines that enter the station, it is possible to reduce the number of base stations required and the radio frequencies used by two.

[0032] Although FIG. 1 shows an example of a station served by three lines, this embodiment can also be applied to a station served by more lines.

[0033] Furthermore, although the above description shows an example in which one radio frequency is assigned to each line, multiple radio frequencies may be assigned to each line. For example, in FIG. 1, different radio frequencies may be used by base station B1-1 and base station B1-2 installed on the same line L1. In this case, the on-board station of train T1 traveling on line L1 needs to use different radio frequencies in wireless communication area B1-1a and wireless communication area B1-2a, but only one base station B10 needs to be installed at the station, and the number of base stations installed at stations can be reduced, just like in the case in which one radio frequency is assigned to each line.

[0034] Also, while Figure 1 shows an example in which two base stations are reduced by installing a base station at a station whose wireless communication area includes the stops of all three lines, it is also possible to reduce one base station by installing two base stations, for example, one whose wireless communication area includes the stops of two of the three lines, and the other whose wireless communication area includes the stops of the remaining line. In other words, installing a base station at a station whose wireless communication area includes the stops of two or more lines will have the effect of reducing the number of base stations by at least one.

[0035] As described above, according to the train radio communication system of this embodiment, by installing a base station shared by multiple lines that enter a station, it is possible to reduce the number of base stations installed at the station and the number of radio frequencies used. As a result, it is possible to increase the number of trains that can enter and stop at the station while suppressing an increase in the number of base stations installed at the station. Furthermore, when multiple radio frequencies are repeatedly used on one line, the number of repetitions increases, which also has the effect of improving the efficiency of the radio frequencies used.

[0036] Increasing the number of trains entering and stopping at a station may increase the load on the wireless communication area B10a of the base station B10 installed at the station. Therefore, in order to suppress the increase in the load on the base station B10, the wireless communication area B10a of the base station B10 may be reduced and the communication area of ​​one of the other base stations may be expanded to cover the reduced range of the wireless communication area B10a.

[0037] <Embodiment 2> In the train wireless communication system of the first embodiment, when many trains enter and stop at a station where the base station B10 is installed, trains with more than n communication slots are basically not allowed to enter the wireless communication area B10a in a communication system using n communication slots SL1 to SLn as shown in Fig. 2. In the second embodiment, a technique is proposed that enables the base station B10 to accommodate on-board stations in a number exceeding the n communication slots.

[0038] Here, it is assumed that the number n of communication slots per communication period (ie, per frame) in the communication method used by the base station B10 is eight.

[0039] For example, when seven trains #1 to #7 are approaching a station where base station B10 is installed, seven of the eight communication slots LS1 to LS8 are assigned to trains #1 to #7, as shown in Figure 3(a). Communication slot SL8 is not in use by any train and is in an open state that can be assigned to any train. Here, it is assumed that train #1, which is using communication slot SL1, and train #7, which is using communication slot SL7, are stopped and not moving.

[0040] When train #8 newly enters the station in the state shown in Figure 3(a), control device C10 instructs base station B10 to allocate an available communication slot SL8 to train #8, as shown in Figure 3(b). When base station B10 receives the instruction and allocates an available communication slot SL8 to train #8, the on-board station of train #8 can use the communication slot SL8 to communicate wirelessly with base station B10. However, since there are no available communication slots, the next train will not be able to enter the station if this continues.

[0041] Therefore, in the second embodiment, when there are no more free communication slots, the control device C10 instructs the base station B10 to assign the trains #1 and #7, which are stopped and not moving, to the same communication slot, and the base station B10, upon receiving the instruction, assigns the trains #1 and #7 to the same communication slot, thereby creating a free communication slot. For example, the control device C10 assigns train #7 in addition to train #1 to the communication slot SL1, and controls communication so that the on-board station of train #1 and the on-board station of train #7 alternately use the communication slot SL1 every communication cycle, as shown in Figure 3(c), leaving the communication slot SL7 free.

[0042] From the state shown in Figure 3(c), when train #2, for example, leaves the station, two communication slots SL2 and SL7 become vacant, as shown in Figure 3(d) (in the state shown in Figure 3(d), trains #1 and #7 remain assigned to communication slot SL1).

[0043] When two free communication slots become available, the control device C10 instructs the base station B10 to assign one of the free communication slots to either train #1 or train #7, which are currently engaged in alternating communication. Upon receiving the instruction, the base station B10 assigns either train #1 or train #7 to one of the free communication slots, thereby canceling the alternating communication. For example, as shown in FIG. 3(e), the allocation of train #7 is returned to communication slot SL7, and only train #1 is assigned to communication slot SL1. In other words, the on-board station of train #1 communicates with the base station B10 using communication slot SL1 every cycle, and the on-board station of train #7 communicates with the base station B10 using communication slot SL7 every cycle.

[0044] Thus, in the second embodiment, when the number of available communication slots falls below a certain number (1 in the above example) under the control of the control device C10, the base station B10 installed at the station assigns two stopped trains to the same communication slot and has the on-board stations of the two trains alternately communicate with the base station B10, thereby keeping at least a certain number of communication slots available. This eliminates the shortage of available communication slots and enables new trains to enter the station. Furthermore, the base station B10 can accommodate on-board stations in a number that exceeds the number of communication slots per communication cycle, improving the efficiency of the radio frequencies used.

[0045] 3 shows an example in which at least one free communication slot is reserved, but two or more free communication slots may be reserved. In other words, the above "certain number" may be two or more. For example, two free communication slots may be reserved so that they can be assigned to a train newly entering a station and to a train starting to move from an alternating communication state.

[0046] <Third Embodiment> In the first embodiment, it is assumed that all of the multiple lines that enter a station use the same communication method. In the third embodiment, an example is shown in which the multiple lines that enter a station include lines that use different communication methods, and a train runs across the lines that use different communication methods.

[0047] When trains operate across lines with different communication methods, there is no problem if the train crew manually switches the voice communication method, but when switching the train control radio communication method, care must be taken because if vehicle position information is transmitted incorrectly between the train radio communication systems of the two lines, it could lead to an accident.

[0048] 4 is a configuration diagram of a train wireless communication system according to a third embodiment. In FIG. 4, train wireless communication systems using different communication methods are operated on lines L1, L2, and L3. That is, different communication methods are used on lines L1 and L2, and the same communication method is used on lines L2 and L3. More specifically, base stations B2-1 and B2-2 installed on line L2 and base stations B3-1 and B3-2 installed on line L3 perform wireless communication with on-board stations using the same communication method, but base stations B1-1 and B1-2 installed on line L1 perform wireless communication with on-board stations using a communication method different from that used by base stations B2-1, B2-2, B3-1, and B3-2.

[0049] 4, the lines L1 and L2 can run into each other at stations. The train T12 runs across the lines L1 and L2.

[0050] Two second base stations, base station B10-1 and base station B10-2, are installed at stations served by lines L1, L2, and L3. Base station B10-1 belongs to the train wireless communication system for line L1 and performs wireless communication with on-board stations of trains that enter the stations using the same communication method as line L1. Base station B10-2 belongs to the train wireless communication system for lines L2 and L3 and performs wireless communication with on-board stations of trains that enter the stations using the same communication method as line L2 and line L3. In other words, base station B10-1 is a second base station for the first communication method, and base station B10-2 is a second base station for the second communication method.

[0051] The wireless communication area B10-1a of base station B10-1 includes stop L1d on line L1 and stop L2d on line L2, and is adjacent to the wireless communication area B1-1a of base station B1-1, the wireless communication area B1-2a of base station B1-2, the wireless communication area B2-1a of base station B2-1, and the wireless communication area B2-2a of base station B2-2.

[0052] On the other hand, the wireless communication area B10-2a of base station B10-2 includes stop L1d on line L1, stop L2d on line L2, and stop L3d on line L3, and is adjacent to each of the wireless communication area B1-1a of base station B1-1, the wireless communication area B1-2a of base station B1-2, the wireless communication area B2-1a of base station B2-1, the wireless communication area B2-2a of base station B2-2, the wireless communication area B3-1a of base station B3-1, and the wireless communication area B3-2a of base station B3-2.

[0053] Stops L1d and L2d on lines L1 and L2, which are mutually accessible but use different communication methods, are included in both wireless communication area B10-1a and wireless communication area B10-2a. In other words, both wireless communication area B10-1a and wireless communication area B10-2a include stops L1d and L2d on lines L1 and L2, which are mutually accessible but use different communication methods.

[0054] 5 is a diagram showing the configuration of a wireless communication device mounted on a train T12 that runs across lines L1 and L2. The wireless communication device of train T12 includes a first on-board station 11 that performs wireless communication using the communication method for line L1, a second on-board station 12 that performs wireless communication using the communication methods for lines L2 and L3, and a control device 10 that controls the first on-board station 11 and the second on-board station 12.

[0055] For example, while train T12 is traveling through wireless communication area B1-1a, the first on-board station 11 communicates wirelessly with base station B1-1. When train T12 subsequently leaves wireless communication area B1-1a, enters wireless communication area B10-1a and wireless communication area B10-2a, and stops at station L1d, the control device 10 causes the second on-board station 12 to start wireless communication with base station B10-2. While train T12 is stopped, the control device 10 transmits the same location information to base station B10-1 using the first on-board station 11 and to base station B10-2 using the second on-board station 12. The control device 10 checks whether the location information of train T12 has been successfully received by base station B10-1 and base station B10-2, and repeats transmitting the location information of train T12 until it is successfully received. As a result, the position information of the train T12 recognized by the train wireless communication system of the line L1 and the train wireless communication systems of the lines L2 and L3 will match.

[0056] Thereafter, train T12 departs station L1d and enters line L2. At this time, the control device 10 causes the first on-board station 11 and the second on-board station 12 to continue communication with base station B10-1 and base station B10-2 until train T12 enters wireless communication area B2-2a of base station B2-2. This allows train T12 to enter line L2 from line L1 without exchanging information about train T12 between the train wireless communication system for line L1 and the train wireless communication systems for lines L2 and L3.

[0057] While it was previously necessary to install three base stations at a station, by installing base station B10-1 and base station B10-2 that are shared by multiple lines that enter the station, it is no longer necessary to install a base station for each line, thereby reducing the number of base stations and the radio frequencies used. Also, by ensuring that stops L1d and L2d on lines L1 and L2, which are mutually accessible but use different communication methods, are included in both wireless communication area B10-1a and wireless communication area B10-2a, the wireless communication device of train T12 can simultaneously transmit the same location information to wireless communication area B10-1a and wireless communication area B10-2a, allowing the train wireless communication system for line L1 and the train wireless communication systems for lines L2 and L3 to match the location information of train T12.

[0058] It should be noted that the embodiments can be freely combined, and the embodiments can be modified or omitted as appropriate.

[0059] (Appendix 1) a plurality of first base stations each having a wireless communication area corresponding to each of the plurality of routes and performing wireless communication using a wireless frequency set for each of the routes; a second base station that is adjacent to the wireless communication areas of the plurality of first base stations, has a wireless communication area that includes two or more stops of the plurality of lines, and performs wireless communication using a specific wireless frequency; an on-board station that is mounted on a train and that performs wireless communication with the first base station in the wireless communication area of ​​the first base station and performs wireless communication with the second base station in the wireless communication area of ​​the second base station; A train radio communication system comprising:

[0060] (Appendix 2) The wireless communication area of ​​the second base station includes all stops of the plurality of lines, 10. A train radio communication system as described in Appendix 1.

[0061] (Appendix 3) the second base station performs wireless communication with the plurality of on-board stations by using a plurality of communication slots obtained by time-dividing one communication cycle, and when the number of available communication slots falls below a certain number, the on-board stations of two stopped trains are assigned to the same communication slot, and communication with the on-board stations of the two trains assigned to the same communication slot is alternately performed every other communication cycle, thereby securing at least the certain number of available communication slots; 1. A train radio communication system according to claim 1 or 2.

[0062] (Appendix 4) the plurality of routes include a route on which wireless communication in the first communication method is performed and a route on which wireless communication in the second communication method is performed; The train wireless communication system includes: the second base station for a first communication method that performs wireless communication of the first communication method; the second base station for a second communication method that performs wireless communication of the second communication method; Equipped with a communication area of ​​the second base station for the first communication method and a communication area of ​​the second base station for the second communication method both include stations on a route on which wireless communication of the first communication method is performed and a station on a route on which wireless communication of the second communication method is performed, and which are accessible to each other; 4. A train radio communication system according to any one of Supplementary Note 1 to Supplementary Note 3. [Explanation of symbols]

[0063] L1, L2, L3 lines, L1d, L2d, L3d stations, B1-1, B1-2, B2-1, B2-2, B3-1, B3-2, B10, B10-1, B10-2 base stations, B1-1a, B1-2a, B2-1a, B2-2a, B3-1a, B3-2a, B10a, B10-1a, B10-2a wireless communication areas, C1, C2, C3 control devices, 10 control devices, 11 first on-board station, 12 second on-board station, T1, T2, T3, T12 trains, SL1 to SLn communication slots.

Claims

1. A plurality of first base stations each using a wireless communication area corresponding to a respective one of a plurality of lines and performing wireless communication using a wireless frequency set for each line; A second base station having a wireless communication area adjacent to the wireless communication areas of the plurality of first base stations and including two or more parking lots among the plurality of lines, and performing wireless communication using a specific wireless frequency; An on-vehicle station mounted on a train, performing wireless communication with the first base station in the wireless communication area of the first base station, and performing wireless communication with the second base station in the wireless communication area of the second base station; A train wireless communication system comprising:

2. The wireless communication area of the second base station includes all the parking lots of the plurality of lines, The train wireless communication system according to claim 1.

3. The specific wireless frequency is different from any of the wireless frequencies set for each line, or is the same as any of the wireless frequencies set for each line. The train wireless communication system according to claim 1 or claim 2.

4. The second base station performs wireless communication with the plurality of on-vehicle stations by using a plurality of communication slots obtained by time-division of one communication cycle. When the number of available communication slots becomes less than a certain number, the on-vehicle stations of two trains in a stopped state are assigned to the same communication slot, and communication with the on-vehicle stations of the two trains assigned to the same communication slot is alternately performed every one communication cycle. The train wireless communication system according to claim 1 or claim 2.

5. Among the plurality of lines, there are lines on which wireless communication of the first communication method is performed and lines on which wireless communication of the second communication method is performed. The train wireless communication system A second base station for the first communication method that performs wireless communication of the first communication method; The second base station for the second communication method that performs wireless communication of the second communication method, comprising The communication area of the second base station for the first communication method and the communication area of the second base station for the second communication method both include a parking lot on a route where wireless communication of the first communication method is performed and a route where wireless communication of the second communication method is performed, and are mutually accessible. The train wireless communication system according to claim 1 or claim 2.

6. A base station control device that controls a second base station that performs wireless communication with a plurality of on-vehicle stations mounted on a train in a wireless communication area including two or more parking lots among a plurality of routes, When the number of available communication slots among a plurality of communication slots obtained by time-division of one communication cycle, which are used when the second base station and the plurality of on-vehicle stations perform wireless communication, becomes less than a certain number, the second base station is controlled to assign the on-vehicle stations of two trains parked in the wireless communication area to the same communication slot. Base station control device.

7. A base station that performs wireless communication with a plurality of on-vehicle stations by using a plurality of communication slots obtained by time-division of one communication cycle, Under the control of the base station control device, the on-vehicle stations of two trains parked are assigned to the same communication slot, and communication with the on-vehicle stations of the two trains assigned to the same communication slot is performed alternately every one communication cycle. Base station.

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