Train radio systems, monitoring equipment, and mobile station equipment

Abstract

This technology provides a way to avoid temporary degradation of received signal strength and improve the maintainability of the entire radio communication path in the train radio system. [Solution] The monitoring device 1 includes a weather information collection unit 11, a train operation information collection unit 12, an RSSI prediction calculation unit 13 that calculates the RSSI prediction value of the mobile station device 3 during train operation based on weather information and train operation information, a determination unit 14 that determines which of the multiple base station devices 2 is predicted to experience RSSI attenuation, and a communication unit 15 that notifies the base station device 2 of radio wave transmission output control. The base station device 2 has a control unit 22 that controls its own radio wave transmission output amount based on the notification of radio wave transmission output control. The monitoring device 1 notifies the base station device 2 that is predicted to experience RSSI attenuation of radio wave transmission output control, taking into account the RSSI prediction value. The base station device 2 controls its own radio wave transmission output amount based on the notification of radio wave transmission output control.

Description

Technical Field

[0001] The present disclosure relates to a train radio system, a monitoring device, and a mobile station device.

Background Art

[0002] Conventionally, there is a communication system that measures the radio wave transmission output of a base station device and the received signal strength of a mobile station device in real time, collects the measurement results in an information processing device, and detects deterioration as a failure factor of a radio device by comparing with normal-time measurement values (for example, see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Non-Patent Documents

[0004]

Non-Patent Document 1

Non-Patent Document 2

Non-Patent Document 3

Non-Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0005] The detection of received signal strength degradation in the technology described in Patent Document 1 aims to identify the cause of failure in the radio equipment. However, the degradation of received signal strength can be caused not only by continuous factors such as failure in the radio equipment, but also by temporary factors such as weather conditions or surrounding structures (shields). Weather conditions include rain attenuation due to rainfall or snowfall, atmospheric attenuation due to humidity in the atmosphere, noise due to lightning, and attenuation due to interference. For details on rain attenuation, atmospheric attenuation, noise, and attenuation, please refer to Non-Patent Documents 1 to 3, respectively. For the effect of shields on radio wave propagation, please refer to Non-Patent Document 4.

[0006] Degradation of received signal strength can lead to serious malfunctions such as the loss of critical control signals in the system. Therefore, prompt recovery after such an event occurs, as well as preventing such events from occurring in the first place, are required in system maintenance.

[0007] While identifying the cause of failure when degradation occurs, as described in Patent Document 1, is effective in shortening the recovery time after the event occurs, it has the problem that it does not allow for preventive measures to avoid the event occurring, in other words, dynamic preventive measures against temporary degradation causes.

[0008] Therefore, the purpose of this disclosure is to provide a technology that can avoid temporary degradation of received signal strength and improve the maintainability of the radio communication path of the entire train radio system. [Means for solving the problem]

[0009] The train radio system according to this disclosure comprises a plurality of base station devices that communicate wirelessly with a mobile station device mounted on a train running on a predetermined track, and a monitoring device that transmits and receives data between the plurality of base station devices and the mobile station device, wherein the monitoring device includes a weather information collection unit that collects weather information, a train operation information collection unit that collects train operation information, an RSSI prediction calculation unit that calculates the RSSI prediction value of the mobile station device when the train is running by calculating the RSSI attenuation amount when the train is running based on the weather information and the train operation information, a determination unit that determines which of the plurality of base station devices is expected to experience RSSI attenuation, and a communication unit that notifies the base station device of radio wave transmission output control, wherein the base station device has a control unit that controls its own radio wave transmission output amount upon notification of radio wave transmission output control, the monitoring device notifies the base station device that is expected to experience RSSI attenuation based on the determination unit of the radio wave transmission output control considering the RSSI prediction value, and the base station device controls its own radio wave transmission output amount based on the notification of radio wave transmission output control. [Effects of the Invention]

[0010] According to this disclosure, it is possible to predict the locations and time periods in which temporary degradation of received signal strength will occur due to weather conditions and surrounding obstructions during train operation. This allows for the avoidance of temporary degradation of received signal strength as a dynamic preventative measure. This improves the maintainability of the radio communication path of the entire train radio system. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is a diagram showing the overall configuration of the train radio system according to Embodiments 1 to 3. [Figure 2] Figure 2 is a block diagram of the devices included in the train radio system according to Embodiment 1. [Figure 3] Figure 3 shows an example of the configuration of a processing circuit included in each device of the train radio system according to Embodiments 1 to 3. [Figure 4]Figure 4 is a diagram showing another example of the configuration of a processing circuit included in each device provided in the train radio system according to Embodiments 1 to 3. [Figure 5] Figure 5 is a flowchart showing the operation of the train radio system according to Embodiment 1. [Figure 6] Figure 6 is a block diagram of each device provided in the train radio system according to Embodiment 2. [Figure 7] Figure 7 is a flowchart showing the operation of the train radio system according to Embodiment 2. [Figure 8] Figure 8 is a block diagram of each device provided in the train radio system according to Embodiment 3. [Figure 9] Figure 9 is a flowchart showing the operation of the train radio system according to Embodiment 3. [Figure 10] Figure 10 is a block diagram of each device provided in a train radio system according to a modification of Embodiment 3. [Modes for Carrying Out the Invention]

[0012] <Embodiment 1> Embodiment 1 will be described below with reference to the drawings. Figure 1 is a configuration diagram of the entire train radio system according to Embodiments 1 to 3.

[0013] First, the overall configuration of the train radio system according to Embodiments 1 to 3 will be described. As shown in Figure 1, the train radio system includes a monitoring device 1, a plurality of base station devices 2, and a mobile station device 3.

[0014] A plurality of base station apparatuses 2 are installed along a predetermined trajectory. The mobile station apparatus 3 is mounted on a train (not shown) that travels on a predetermined trajectory. The monitoring apparatus 1 and the base station apparatuses 2 are connected by wired connection or wireless connection. The base station apparatuses 2 and the mobile station apparatus 3 are wirelessly connected. The monitoring apparatus 1 transmits and receives data to and from the mobile station apparatus 3 via the plurality of base station apparatuses 2. The base station apparatuses 2 and the mobile station apparatus 3 can control their own radio wave transmission output. The mobile station apparatus 3 has a function of measuring the received signal strength indicator (RSSI) of radio waves transmitted from the base station apparatuses 2 in real time.

[0015] Next, each device included in the train radio system according to Embodiment 1 will be described. FIG. 2 is a block diagram of each device included in the train radio system according to Embodiment 1.

[0016] As shown in FIG. 2, the monitoring apparatus 1 includes a weather information collection unit 11, a train operation information collection unit 12, an RSSI prediction calculation unit 13, a determination unit 14, and a communication unit 15. The monitoring apparatus 1 is also connected to the Internet.

[0017] The weather information collection unit 11 collects weather information from data announced by the Meteorological Agency via the Internet. The train operation information collection unit 12 collects train operation information from the train via the base station apparatus 2. The train operation information is data including the train travel time and the train travel position. The RSSI prediction calculation unit 13 calculates the RSSI attenuation amount during train travel based on the weather information and the train operation information, thereby calculating the RSSI predicted value of the mobile station apparatus 3 during train travel. The determination unit 14 identifies the base station apparatus 2 where attenuation is observed based on the RSSI predicted value. That is, the determination unit 14 determines, from among the plurality of base station apparatuses 2, the base station apparatus 2 that is predicted to experience RSSI attenuation. The communication unit 15 transmits and receives data to and from each base station apparatus 2. In particular, the communication unit 15 notifies the identified base station apparatus 2 of radio wave transmission output control.

[0018] The base station device 2 comprises a communication unit 21 and a control unit 22. The communication unit 21 transmits and receives data with the monitoring device 1. In particular, the communication unit 21 receives notifications of radio wave transmission output control transmitted from the monitoring device 1. The control unit 22 controls the radio wave transmission output of its own device based on the notifications of radio wave transmission output control. In this embodiment 1, the mobile station device 3 is not involved in the control of the radio wave transmission output, so the description of the mobile station device 3 is omitted.

[0019] Figure 3 shows an example of the configuration of the processing circuit 90 included in each device of the train radio system of Embodiments 1 to 3.

[0020] Each function of the monitoring device 1 is realized by the processing circuit 90. In other words, the processing circuit 90 has each function of the monitoring device 1.

[0021] If the processing circuit 90 is dedicated hardware, the processing circuit 90 may be, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a circuit combining these. Each function of the monitoring device 1 may be implemented by multiple processing circuits, or they may be implemented together by a single processing circuit.

[0022] Figure 4 shows another example of the configuration of the processing circuit included in each device of the train radio system of Embodiments 1 to 3. The processing circuit has a processor 91 and a memory 92. The various functions of the monitoring device 1 are realized when the processor 91 executes a program stored in the memory 92. For example, the various functions of the monitoring device 1 are realized when software written as a program is executed by the processor 91. Thus, the monitoring device 1 has a memory 92 for storing programs and a processor 91 for executing those programs.

[0023] The program describes each function of monitoring device 1. The program causes the computer to execute the procedures or methods for each function of monitoring device 1.

[0024] The processor 91 is, for example, a CPU (Central Processing Unit). The memory 92 is, for example, a non-volatile or volatile semiconductor memory such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable Read Only Memory), or EEPROM (Electrically Erasable Programmable Read Only Memory). Alternatively, the memory 92 may be an HDD (Hard Disk Drive).

[0025] Each function of the monitoring device 1 may be partially implemented by dedicated hardware and partially by software. The processing circuit implements each of the above functions through a combination of hardware and software.

[0026] Here, the functions of the base station device 2 and the mobile station device 3 are also implemented by the processing circuit 90 in Figure 3, or the processor 91 and memory 92 in Figure 4, similar to the monitoring device 1.

[0027] Next, the operation of the train radio system according to Embodiment 1 will be described. Figure 5 is a flowchart showing the operation of the train radio system according to Embodiment 1.

[0028] First, in step S51, the weather information collection unit 11 of the monitoring device 1 collects weather information for the area of ​​each base station device 2 located on a predetermined orbit. The weather information is time-series data showing precipitation due to rain or snow, atmospheric humidity, time of lightning strikes, and location of lightning strikes.

[0029] In step S52, the train operation information collection unit 12 of the monitoring device 1 collects train operation information for each train. The train operation information is data indicating the train's travel time and train's location.

[0030] In step S53, the RSSI prediction calculation unit 13 of the monitoring device 1 calculates RSSI prediction values ​​for the entire area during train operation from weather information and train operation information. More specifically, the RSSI prediction calculation unit 13 calculates the amount of rainfall attenuation of radio waves based on precipitation, atmospheric attenuation based on humidity, lightning noise during thunderstorms, RSSI attenuation due to interference, and RSSI attenuation based on the conditions of obstacles around the train running, based on train operation information, and calculates the RSSI prediction value to be received by the mobile station device 3 installed on the train. The conditions of obstacles around the train running include passing trains, buildings such as stations or tunnels, and terrain such as mountains or forests. The RSSI attenuation is calculated using the methods described in Non-Patent Documents 1 to 4.

[0031] In step S54, the determination unit 14 of the monitoring device 1 determines whether there is an area where the RSSI predicted value has deteriorated beyond a threshold. Here, the area is the range that can be reached by radio waves transmitted by one base station device 2. The threshold for comparison with the RSSI predicted value is pre-stored in a memory (not shown) of the monitoring device 1, for example.

[0032] If there is an area where the RSSI predicted value has deteriorated beyond a threshold (Yes in step S54), in step S55, the communication unit 15 of the monitoring device 1 notifies the base station device 2 of the radio wave transmission power control. That is, the communication unit 15 of the monitoring device 1 notifies the base station device 2 of the radio wave transmission power control that takes the RSSI predicted value into consideration.

[0033] In step S56, the control unit 22 of the base station device 2 controls the radio wave transmission output of the base station device 2 in accordance with the train's travel time, based on the notification of radio wave transmission output control received from the monitoring device 1 via the communication unit 21. That is, the control unit 22 of the base station device 2 controls its own radio wave transmission output amount based on the notification of radio wave transmission output control. After that, the process ends.

[0034] On the other hand, if there are no areas in the RSSI prediction value that exceed the threshold (No in step S54), the process ends.

[0035] In this embodiment, the functions of the weather information collection unit 11, train operation information collection unit 12, RSSI prediction calculation unit 13, and determination unit 14 of the monitoring device 1 may also be provided by the base station device 2.

[0036] As described above, Embodiment 1 includes a plurality of base station devices 2 that communicate wirelessly with a mobile station device 3 mounted on a train running on a predetermined track, and a monitoring device 1 that transmits and receives data between the mobile station device 3 and the plurality of base station devices 2. The monitoring device 1 includes a weather information collection unit 11 that collects weather information, a train operation information collection unit 12 that collects train operation information, an RSSI prediction calculation unit 13 that calculates the RSSI prediction value of the mobile station device 3 when the train is running by calculating the RSSI attenuation amount when the train is running based on the weather information and train operation information, a determination unit 14 that determines which of the plurality of base station devices 2 is expected to experience RSSI attenuation, and a communication unit 15 that notifies the base station devices 2 of radio wave transmission output control. The base station devices 2 have a control unit 22 that controls its own radio wave transmission output amount based on the notification of radio wave transmission output control. The monitoring device 1 notifies the base station devices 2 that are expected to experience RSSI attenuation based on the determination unit of radio wave transmission output control, taking into account the RSSI prediction value. The base station devices 2 control their own radio wave transmission output amount based on the notification of radio wave transmission output control.

[0037] Therefore, because it is possible to predict the locations and time periods in which temporary degradation of received signal strength will occur due to weather conditions and surrounding obstructions during train operation, it becomes possible to avoid temporary degradation of received signal strength as a dynamic preventative measure. This improves the maintainability of the radio communication channels of the entire train radio system.

[0038] <Embodiment 2> Next, Embodiment 2 will be described. Figure 6 is a block diagram of the devices included in the train radio system according to Embodiment 2. In Embodiment 2, the same reference numerals are used for components that are the same as those described in Embodiment 1, and their descriptions are omitted.

[0039] In Embodiment 1, the control unit 22 of the base station device 2 controlled the radio wave transmission output, but in Embodiment 2, the control unit 32 of the mobile station device 3 controls the radio wave transmission output.

[0040] As shown in Figure 6, the monitoring device 1 has the same configuration as in Figure 2, except that it does not have a determination unit 14, and the base station device 2 has the same configuration as in Figure 2, so the explanation of the monitoring device 1 and base station device 2 will be omitted.

[0041] The mobile station device 3 comprises a communication unit 31, a control unit 32, and a determination unit 33. The communication unit 31 transmits and receives data with the monitoring device 1 or the base station device 2. The determination unit 33 determines the area where RSSI attenuation is expected to occur. The control unit 32 controls the radio wave transmission output of the device based on the determination result.

[0042] Next, the operation of the train radio system according to Embodiment 2 will be described. Figure 7 is a flowchart showing the operation of the train radio system according to Embodiment 2.

[0043] Steps S71 and S72 are the same as steps S51 and S52 in Figure 5, so their explanation will be omitted.

[0044] In step S73, the RSSI prediction calculation unit 13 of the monitoring device 1 calculates RSSI prediction values ​​for the entire area during train operation from weather information and train operation information. More specifically, the RSSI prediction calculation unit 13 calculates the amount of rainfall attenuation of radio waves based on precipitation, atmospheric attenuation based on humidity, lightning noise during thunderstorms, RSSI attenuation due to interference, and RSSI attenuation based on the condition of surrounding obstacles where the train is running, based on train operation information, and calculates the RSSI prediction value to be received by the base station device 2.

[0045] In step S74, the communication unit 15 of the monitoring device 1 notifies the mobile station device 3, which is installed on the train that made the prediction, of the RSSI prediction values ​​for the entire area during train operation. That is, the communication unit 15 of the monitoring device 1 notifies the RSSI prediction values ​​calculated based on weather information and train operation information.

[0046] In step S75, the determination unit 33 of the mobile station device 3 determines whether there is an area where the RSSI predicted value has deteriorated beyond a threshold. The threshold for comparison with the RSSI predicted value is pre-stored, for example, in a memory (not shown) of the mobile station device 3.

[0047] If there is an area where the RSSI prediction value has deteriorated beyond a threshold (Yes in step S75), in step S76, the control unit 22 of the mobile station device 3 controls the radio wave transmission output of the mobile station device 3 mounted on the train when traveling through that area. That is, the control unit 22 of the mobile station device 3 controls its own radio wave transmission output based on the notification of the RSSI prediction value. After that, the process ends.

[0048] On the other hand, if there are no areas in the RSSI prediction value that exceed the threshold (No in step S75), the process ends.

[0049] As described above, Embodiment 2 includes a mobile station device 3 mounted on a train traveling on a predetermined track, a plurality of base station devices 2 that communicate wirelessly with the mobile station device 3, and a monitoring device 1 that transmits and receives data between the mobile station device 3 and the plurality of base station devices 2. The monitoring device 1 includes a weather information collection unit 11 that collects weather information, a train operation information collection unit 12 that collects train operation information, an RSSI prediction calculation unit 13 that calculates the RSSI prediction value for the base station devices 2 when the train is running by calculating the RSSI attenuation amount when the train is running based on the weather information and train operation information, and a communication unit 15 that notifies the mobile station device 3 of the RSSI prediction value. The mobile station device 3 includes a determination unit 33 that determines an area where RSSI attenuation is predicted to occur, and a control unit 32 that controls its own radio wave transmission output amount based on the determination result. When the train is located in the area, the mobile station device 3 controls its own radio wave transmission output amount based on the notification of the RSSI prediction value.

[0050] Therefore, because it is possible to predict the locations and time periods in which temporary degradation of received signal strength will occur due to weather conditions and surrounding obstructions during train operation, it becomes possible to avoid temporary degradation of received signal strength as a dynamic preventative measure. This improves the maintainability of the radio communication channels of the entire train radio system.

[0051] <Embodiment 3> Next, Embodiment 3 will be described. Figure 8 is a block diagram of the devices included in the train radio system according to Embodiment 3. In Embodiment 3, the same reference numerals are used for components that are the same as those described in Embodiments 1 and 2, and their descriptions are omitted.

[0052] In Embodiment 3, in addition to controlling the radio wave transmission output in Embodiment 2, the base station device 2 or mobile station device 3 where RSSI attenuation is occurring is identified based on the RSSI prediction value and the RSSI measurement value measured during train operation.

[0053] As shown in Figure 8, the monitoring device 1 has a data storage unit 16, a data analysis unit 17, and a display unit 18 in addition to the configuration in Figure 6. The weather information collection unit 11, the train operation information collection unit 12, the RSSI prediction calculation unit 13, and the communication unit 15 have the same configuration as in Figure 6, so their explanation is omitted.

[0054] The data storage unit 16 stores the RSSI prediction value and the RSSI measurement value measured by the mobile station device 3. The data analysis unit 17 identifies the base station device 2 or mobile station device 3 where RSSI attenuation is occurring based on the stored RSSI prediction value and RSSI measurement value. The display unit 18 displays the results obtained from the data analysis unit 17. The display unit 18 is, for example, a display.

[0055] The base station device 2 has the same configuration as shown in Figure 6, so its description is omitted. The mobile station device 3 has an additional RSSI measurement unit 34 compared to the configuration shown in Figure 6. The communication unit 31, control unit 32, and determination unit 33 have the same configuration as shown in Figure 6, so their descriptions are omitted. The RSSI measurement unit 34 measures the RSSI during train operation as the RSSI measurement value.

[0056] Next, the operation of the train radio system according to Embodiment 3 will be described. Figure 9 is a flowchart showing the operation of the train radio system according to Embodiment 3. Note that the processing in the flowchart of Embodiment 3 is executed in parallel with the processing in the flowchart of Figure 7.

[0057] First, in step S91, the monitoring device 1 stores the RSSI prediction value calculated in step S73 of Figure 7 in the data storage unit 16.

[0058] In step S92, the determination unit 33 of the mobile station device 3 measures the RSSI during train operation as an RSSI measurement value in real time, and the communication unit 31 of the mobile station device 3 notifies the monitoring device 1 of the measurement result via the base station device 2.

[0059] In step S93, the monitoring device 1 stores the RSSI measurement values ​​notified from the mobile station device 3 mounted on the moving train in the data storage unit 16.

[0060] Next, the data analysis unit 17 of the monitoring device 1 identifies the base station device 2 or mobile station device 3 where RSSI attenuation is occurring, based on the stored RSSI predicted value and RSSI measured value. Specifically, the data analysis unit 17 of the monitoring device 1 performs the processing described in steps S94 to S97 below.

[0061] In step S94, the data analysis unit 17 of the monitoring device 1 compares multiple RSSI predicted values ​​and multiple RSSI measured values ​​stored in the data storage unit 16, respectively, and determines whether the RSSI measured value is lower than the RSSI predicted value in the same base station device 2.

[0062] If the RSSI measurement value is lower than the RSSI prediction value (Yes in step S94), the data analysis unit 17 determines that there is a malfunction in the base station device 2 (step S95), and the process proceeds to step S96.

[0063] On the other hand, if the RSSI measurement value is not lower than the RSSI prediction value (No in step S94), in step S96, the data analysis unit 17 of the monitoring device 1 compares the multiple RSSI prediction values ​​and multiple RSSI measurement values ​​stored in the data storage unit 16, respectively, and determines whether the RSSI measurement value is lower than the RSSI prediction value in the mobile station device 3 installed on the same train.

[0064] If the RSSI measurement value is lower than the RSSI prediction value (Yes in step S96), the data analysis unit 17 determines that there is a malfunction in the mobile station device 3 (step S97), and the process proceeds to step S98.

[0065] On the other hand, if the RSSI measurement value does not fall below the RSSI prediction value (No in step S96), in step S98, the display unit 18 of the monitoring device 1 displays the failure prediction information obtained from the data analysis unit 17. Specifically, the display unit 18 of the monitoring device 1 displays the failure prediction information if a failure is determined to exist in step S95 or S97, and does not display the failure prediction information if a failure is not determined to exist. After that, the process ends.

[0066] Next, a modified version of Embodiment 3 will be described. In the above description, it was explained that the flowchart processing of Embodiment 3 is performed in parallel with the flowchart processing of Figure 7, but it may also be performed in parallel with the flowchart processing of Figure 5. That is, in addition to controlling the radio wave transmission output amount in Embodiment 1, the base station device 2 or mobile station device 3 where RSSI attenuation is occurring may be identified based on the RSSI predicted value and the RSSI measured value measured during train operation.

[0067] Figure 10 is a block diagram of the devices included in the train radio system according to a modified example of Embodiment 3. As shown in Figure 10, the monitoring device 1 further includes a data storage unit 16, a data analysis unit 17, and a display unit 18 compared to the configuration in Figure 2. The data storage unit 16, data analysis unit 17, and display unit 18 have the same configuration as in Figure 8, so their description is omitted.

[0068] Since the base station device 2 has the same configuration as shown in Figure 2, its description is omitted. The mobile station device 3 has a communication unit 31, a control unit 32, and an RSSI measurement unit 34 in addition to the configuration shown in Figure 2. The communication unit 31, control unit 32, and RSSI measurement unit 34 have the same configuration as shown in Figure 8, so their description is omitted.

[0069] As described above, in Embodiment 3, the mobile station device 3 further includes an RSSI measurement unit 34 that measures the RSSI during train operation as an RSSI measurement value, and a communication unit 31 that notifies the monitoring device 1 of the RSSI measurement value. The monitoring device 1 further includes a data storage unit 16 that stores RSSI predicted values ​​and RSSI measurement values, a data analysis unit 17 that identifies the base station device 2 or mobile station device 3 where RSSI attenuation is occurring based on the stored RSSI predicted values ​​and RSSI measurement values, and a display unit 18 that displays the results obtained from the data analysis unit 17.

[0070] Therefore, by detecting the steady-state RSSI attenuation of base station equipment 2 or mobile station equipment 3, it is possible to predict failures in either base station equipment 2 or mobile station equipment 3, which is expected to improve the efficiency of maintenance work for the entire train radio system.

[0071] Furthermore, it is possible to freely combine each embodiment, or to modify or omit each embodiment as appropriate.

[0072] The various aspects of this disclosure are summarized below as an appendix.

[0073] (Note 1) A mobile station device mounted on a train traveling on a predetermined track and multiple base station devices that communicate wirelessly with it, The system includes a monitoring device that transmits and receives data between the mobile station device and multiple base station devices, The aforementioned monitoring device is The weather information collection unit collects weather information, The train operation information collection department collects train operation information, An RSSI prediction calculation unit calculates the RSSI attenuation amount during train operation based on the aforementioned weather information and the aforementioned train operation information, thereby calculating the RSSI prediction value of the mobile station device during train operation. A determination unit that determines which of the multiple base station devices is expected to experience RSSI attenuation, It has a communication unit that notifies the base station device of radio wave transmission output control, The base station device has a control unit that controls its own radio wave transmission output amount upon notification of the radio wave transmission output control, The monitoring device notifies the base station device, which is predicted by the determination unit to experience RSSI attenuation, of the radio wave transmission output control taking into account the predicted RSSI value. The base station device controls its own radio wave transmission output based on the notification of radio wave transmission output control, and is part of a train radio system.

[0074] (Note 2) A mobile station device mounted on a train traveling on a predetermined track, Multiple base station devices that perform wireless communication with the aforementioned mobile station device, The system includes a monitoring device that transmits and receives data between the mobile station device and multiple base station devices, The aforementioned monitoring device is The weather information collection unit collects weather information, The train operation information collection department collects train operation information, An RSSI prediction calculation unit calculates the RSSI attenuation amount during train operation based on the weather information and the train operation information, and calculates the RSSI prediction value of the base station device during train operation. It has a communication unit that notifies the mobile station device of the RSSI prediction value, The aforementioned mobile station device is A determination unit that determines the area where RSSI attenuation is predicted to occur, It has a control unit that controls its own radio wave transmission output based on the judgment result, The mobile station device controls its own radio transmission output based on notification of the RSSI prediction value when the train is located in the area, as part of a train radio system.

[0075] (Note 3) The aforementioned mobile station device is An RSSI measuring unit that measures the RSSI during train operation as an RSSI measurement value, The system further includes a communication unit that notifies the monitoring device of the RSSI measurement value, The aforementioned monitoring device is A data storage unit that stores the RSSI predicted value and the RSSI measured value, A data analysis unit identifies the base station device or mobile station device where RSSI attenuation is occurring based on the stored RSSI prediction value and the RSSI measurement value, The train radio system according to Appendix 1 or Appendix 2, further comprising a display unit for displaying the results obtained from the data analysis unit.

[0076] (Note 4) A monitoring device that transmits and receives data between itself and a mobile station device mounted on a train traveling on a predetermined track, via multiple base station devices that communicate wirelessly with the mobile station device, The weather information collection unit collects weather information, The train operation information collection department collects train operation information, An RSSI prediction calculation unit calculates the RSSI attenuation amount during train operation based on the aforementioned weather information and the aforementioned train operation information, thereby calculating the RSSI prediction value of the mobile station device during train operation. A determination unit that determines which of the multiple base station devices is expected to experience RSSI attenuation, It comprises a communication unit that notifies the base station device of radio wave transmission output control, The aforementioned communications unit is A monitoring device that notifies a base station device, which is predicted by the determination unit to experience RSSI attenuation, of the radio wave transmission output control taking into account the predicted RSSI value.

[0077] (Note 5) A monitoring device that transmits and receives data between itself and a mobile station device mounted on a train traveling on a predetermined track, via multiple base station devices that communicate wirelessly with the mobile station device, The weather information collection unit collects weather information, The train operation information collection department collects train operation information, An RSSI prediction calculation unit calculates the RSSI attenuation amount during train operation based on the weather information and the train operation information, and calculates the RSSI prediction value of the base station device during train operation. A monitoring device comprising a communication unit that notifies the mobile station device of the RSSI prediction value.

[0078] (Note 6) A data storage unit that stores the RSSI predicted value and the RSSI measured value of the mobile station device, A data analysis unit identifies the base station equipment or mobile station equipment where RSSI attenuation is occurring based on the stored RSSI prediction value and the RSSI measurement value, The monitoring device described in Appendix 5 further comprises a display unit for displaying the results obtained from the data analysis unit.

[0079] (Note 7) A mobile station device that transmits and receives data between itself and a monitoring device via multiple base station devices that communicate wirelessly with a mobile station device mounted on a train traveling on a predetermined track, A determination unit that determines the area where RSSI attenuation is predicted to occur, It comprises a control unit that controls its own radio wave transmission output based on the judgment result, The control unit, A mobile station device that, when the aforementioned train is located in the aforementioned area, controls its own radio wave transmission output based on an RSSI prediction value calculated by determining the RSSI attenuation amount during the train's operation based on weather information and train operation information collected by the monitoring device.

[0080] (Note 8) An RSSI measuring unit that measures the RSSI during train operation as an RSSI measurement value, The mobile station device according to Appendix 7, further comprising a communication unit for notifying the monitoring device of the RSSI measurement value. [Explanation of Symbols]

[0081] 1 Monitoring device, 2 Base station device, 3 Mobile station device, 11 Weather information collection unit, 12 Train operation information collection unit, 13 RSSI prediction calculation unit, 14 Judgment unit, 15 Communication unit, 16 Data storage unit, 17 Data analysis unit, 18 Display unit, 22 Control unit, 31 Communication unit, 32 Control unit, 33 Judgment unit, 34 RSSI measurement unit.

Claims

1. A mobile station device mounted on a train traveling on a predetermined track and multiple base station devices that communicate wirelessly with it, The system includes a monitoring device that transmits and receives data between the mobile station device and multiple base station devices, The aforementioned monitoring device is The weather information collection unit collects weather information, The train operation information collection department collects train operation information, An RSSI prediction calculation unit calculates the RSSI attenuation amount during train operation based on the weather information and the train operation information, thereby calculating the RSSI prediction value of the mobile station device during train operation. A determination unit that determines which of the multiple base station devices is expected to experience RSSI attenuation, It has a communication unit that notifies the base station device of radio wave transmission output control, The base station device has a control unit that controls its own radio wave transmission output amount upon notification of the radio wave transmission output control, The monitoring device notifies the base station device, which is predicted by the determination unit to experience RSSI attenuation, of the radio wave transmission output control taking into account the predicted RSSI value. The base station device controls its own radio wave transmission output based on the notification of radio wave transmission output control, and is part of a train radio system.

2. A mobile station device mounted on a train traveling on a predetermined track, Multiple base station devices that perform wireless communication with the aforementioned mobile station device, The system includes a monitoring device that transmits and receives data between the mobile station device and multiple base station devices, The aforementioned monitoring device is The weather information collection unit collects weather information, The train operation information collection department collects train operation information, An RSSI prediction calculation unit calculates the RSSI attenuation amount during train operation based on the weather information and the train operation information, thereby calculating the RSSI prediction value of the base station device during train operation. It has a communication unit that notifies the mobile station device of the RSSI prediction value, The aforementioned mobile station device is A determination unit that determines the area where RSSI attenuation is predicted to occur, It has a control unit that controls its own radio wave transmission output based on the judgment result, The mobile station device controls its own radio wave transmission output based on notification of the RSSI prediction value when the train is located in the area, as part of a train radio system.

3. The aforementioned mobile station device is An RSSI measuring unit that measures the RSSI during train operation as an RSSI measurement value, The system further includes a communication unit that notifies the monitoring device of the RSSI measurement values, The aforementioned monitoring device is A data storage unit that stores the RSSI predicted value and the RSSI measured value, A data analysis unit identifies the base station device or mobile station device where RSSI attenuation is occurring based on the stored RSSI prediction value and the RSSI measurement value, The train radio system according to claim 1 or claim 2, further comprising a display unit for displaying the results obtained from the data analysis unit.

4. A monitoring device that transmits and receives data between itself and a mobile station device mounted on a train traveling on a predetermined track, via multiple base station devices that communicate wirelessly with the mobile station device, The weather information collection unit collects weather information, The train operation information collection department collects train operation information, An RSSI prediction calculation unit calculates the RSSI attenuation amount during train operation based on the weather information and the train operation information, thereby calculating the RSSI prediction value of the mobile station device during train operation. A determination unit that determines which of the multiple base station devices is expected to experience RSSI attenuation, It comprises a communication unit that notifies the base station device of radio wave transmission output control, The aforementioned communications unit is A monitoring device that notifies a base station device, which is predicted by the determination unit to experience RSSI attenuation, of the radio wave transmission output control taking into account the RSSI prediction value.

5. A monitoring device that transmits and receives data between itself and a mobile station device mounted on a train traveling on a predetermined track, via multiple base station devices that communicate wirelessly with the mobile station device, The weather information collection unit collects weather information, The train operation information collection department collects train operation information, An RSSI prediction calculation unit calculates the RSSI attenuation amount during train operation based on the weather information and the train operation information, thereby calculating the RSSI prediction value of the base station device during train operation. A monitoring device comprising a communication unit that notifies the mobile station device of the RSSI prediction value.

6. A data storage unit that stores the RSSI predicted value and the RSSI measured value measured by the mobile station device, A data analysis unit identifies the base station device or mobile station device where RSSI attenuation is occurring based on the stored RSSI prediction value and the RSSI measurement value, The monitoring device according to claim 5, further comprising a display unit for displaying the results obtained from the data analysis unit.

7. A mobile station device that transmits and receives data between itself and a monitoring device via multiple base station devices that communicate wirelessly with a mobile station device mounted on a train traveling on a predetermined track, A determination unit that determines the area where RSSI attenuation is predicted to occur, It comprises a control unit that controls its own radio wave transmission output based on the judgment result, The control unit, A mobile station device that, when the aforementioned train is located in the aforementioned area, controls its own radio wave transmission output based on an RSSI prediction value calculated by determining the RSSI attenuation amount during the train's operation based on weather information and train operation information collected by the monitoring device.

8. An RSSI measuring unit that measures the RSSI during train operation as an RSSI measurement value, The mobile station device according to claim 7, further comprising a communication unit for notifying the monitoring device of the RSSI measurement value.

Images