Radio performance measurement system, measuring device, central device, on-board radio equipment

Abstract

To provide a technique that can measure the radio performance of a radio machine mounted on a vehicle without dispatching a worker to the vehicle.SOLUTION: A radio performance measurement system 100 includes a central device 90 and an on-vehicle station radio machine being a radio machine 50 included in an on-vehicle station 91 mounted on a vehicle. The radio machine 50 being the on-vehicle station radio machine outputs a radio signal. The radio machine 50 measures the transmission power being the power of the radio signal. The radio machine 50 notifies the central device 90 of the measurement result being the measured transmission power.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a wireless performance measurement system for measuring wireless performance of a wireless device. [Background technology]

[0002] Patent Document 1 discloses a configuration (hereinafter referred to as "related configuration A") for grasping the wireless performance of a base station within a control station without an operator or the like visiting the installation site of the base station. In related configuration A, for example, the wireless performance of the base station is measured and the measurement result is transmitted to the control station. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2001-268021 A Summary of the Invention [Problem to be solved by the invention]

[0004] On the other hand, currently, when it comes to wireless devices installed in vehicles, a worker is dispatched to the vehicle and the worker manually measures the wireless performance of the wireless device.

[0005] The present disclosure has been made to solve such problems, and aims to provide technology that can measure the wireless performance of a radio device installed in a vehicle without dispatching a worker to the vehicle. [Means for solving the problem]

[0006] In order to achieve the above-mentioned objective, a wireless performance measurement system according to one embodiment of the present disclosure comprises a central device and an on-board station radio which is a radio included in an on-board station mounted on a vehicle, the on-board station radio having a function of communicating with the central device via a network, the on-board station radio outputting a wireless signal, the on-board station radio measuring a transmission power which is the power of the wireless signal, and the on-board station radio notifying the central device of the measurement result which is the measured transmission power.

[0007] A wireless performance measurement system according to another aspect of the present disclosure includes a central device, an on-board station radio that is a radio included in an on-board station mounted on a vehicle, and a measurement device having a function of communicating with the central device via a network, wherein the measurement device receives a wireless signal output by the on-board station radio, measures a frequency deviation of the wireless signal, and notifies the central device of the measurement result, which is the measured frequency deviation. Effect of the Invention

[0008] According to the present disclosure, it is possible to measure the wireless performance of a wireless device installed in a vehicle without dispatching a worker to the vehicle. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing a configuration of a wireless performance measurement system according to a first embodiment. [Diagram 2] 2 is a block diagram showing the configurations of a central device and an on-board station according to the first embodiment. FIG. [Diagram 3] FIG. 11 is a diagram showing a configuration of a wireless performance measurement system according to a second embodiment. [Figure 4] FIG. 11 is a block diagram showing configurations of a central device, an on-board station, and a measuring device according to a second embodiment. [Diagram 5] FIG. 11 is a diagram showing a configuration of a wireless performance measurement system according to a third embodiment. [Figure 6] FIG. 11 is a block diagram showing the configurations of a central device and an on-board station according to a third embodiment. [Figure 7]FIG. 13 is a diagram illustrating a configuration of a wireless performance measurement system according to a fourth embodiment. [Figure 8] FIG. 13 is a block diagram showing configurations of a central device, an on-board station, and a measuring device according to a fourth embodiment. [Figure 9] FIG. 13 is a diagram illustrating a configuration of a wireless performance measurement system according to a fifth embodiment. [Figure 10] FIG. 13 is a block diagram showing a configuration of a central device according to a fifth embodiment. [Figure 11] FIG. 2 is a diagram illustrating an example of a hardware configuration of a wireless performance measurement system. [Figure 12] FIG. 11 is a diagram illustrating another example of a hardware configuration of a wireless performance measurement system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment will be described with reference to the drawings.

[0011] <Embodiment 1> (System Configuration) Fig. 1 is a diagram showing a configuration of a wireless performance measurement system 100 according to the first embodiment. In Fig. 1, a wireless base station 93 that is not included in the wireless performance measurement system 100 is shown.

[0012] The wireless performance measurement system 100 includes a central device 90 and a plurality of on-board stations 91. As an example, three on-board stations 91 are shown in Fig. 1. Note that the number of on-board stations 91 included in the wireless performance measurement system 100 is not limited to three, and may be one, two, four or more.

[0013] The central unit 90 has a function for carrying out communications.

[0014] The on-board station 91 is a device mounted on a train car (not shown). The on-board station 91 has a function of performing wireless communication. The on-board station 91 performs wireless communication with, for example, a wireless base station 93. The on-board station 91 mounted on a train car (not shown) includes a wireless device 50. That is, the wireless device 50 is mounted on the train car.

[0015] The wireless device 50 has a function of performing wireless communication. Hereinafter, the wireless device 50 included in the on-board station 91 is also referred to as an “on-board station wireless device.” The wireless device 50, which is an on-board station wireless device, is included in a wireless performance measurement system 100.

[0016] The radio 50, which is an on-board station radio, has a function of communicating with the central unit 90 via the network N1. That is, the radio 50, which is an on-board station radio, is connected to the central unit 90 via the network N1. The network N1 is, for example, a network for maintenance and monitoring. The radio 50 also has a function of outputting a radio signal.

[0017] In this embodiment, the radio 50, which is an on-board station radio, measures the radio performance of the radio 50 and notifies the central device 90 of the measurement results.

[0018] 1 will also be referred to as on-board stations 91a, 91b, and 91c, respectively. The wireless performance measurement system 100 includes the on-board stations 91a, 91b, and 91c.

[0019] (Device Configuration) Fig. 2 is a block diagram showing the configurations of the central device 90 and the on-board station 91 according to the embodiment 1. In Fig. 2, the on-board station 91 is shown as an on-board station 91a as an example.

[0020] First, a description will be given of the central device 90. The central device 90 includes a control unit C1, a recording unit C2, and a monitoring unit 3. The recording unit C2 has a function of storing information.

[0021] The control unit C1 has various functions. For example, the control unit C1 has a function of specifying the radio 50 of the on-board station 91 to be measured and transmitting a measurement request signal RQ (described later) to the radio 50. The control unit C1 also has a function of communicating with the on-board station 91 via the network N1.

[0022] In the following, the deterioration of the radio performance of the radio device 50, which is an on-board station radio device, is also referred to as "radio performance deterioration." Also, in the following, a sign of deterioration of the radio performance of the radio device 50, which is an on-board station radio device, is also referred to as "a sign of radio performance deterioration."

[0023] Although details will be described later, the monitor unit 3 has a function of detecting degradation of wireless performance or a sign of degradation of wireless performance.

[0024] Next, the on-board station 91 as the on-board station 91a will be described. The on-board station 91 includes a radio device 50. The radio device 50 includes a control unit V1, a recording unit V2, a radio unit 12, and a transmission power measurement unit 13. The recording unit V2 has a function of storing information.

[0025] The control unit V1 has various functions. For example, the control unit V1 has a function of performing wireless transmission control for the wireless unit 12. The control unit V1 also has a function of communicating with the central device 90 via the network N1.

[0026] The radio unit 12 is connected to the antenna At1. The radio unit 12 has a function of outputting a radio signal in response to radio transmission control by the control unit V1. The radio signal output from the radio unit 12 is output to the outside of the radio device 50 via the antenna At1.

[0027] Hereinafter, the power of the radio signal will also be referred to as “transmission power.” The transmission power is the power of the radio signal that is output.

[0028] The transmission power measuring unit 13 has a function of measuring the transmission power, which is the power of the radio signal output from the radio unit 12 .

[0029] In the following, the time when the transmission power of the wireless signal is measured by the transmission power measuring unit 13 is also referred to as "measurement time A." Also, in the following, the time when the wireless signal output from the wireless unit 12 is output to the outside of the wireless device 50 via the antenna At1 is also referred to as "transmission time." Measurement time A almost coincides with the transmission time. In other words, measurement time A corresponds to the transmission time.

[0030] The configuration of each of the on-board stations 91b and 91c in Fig. 1 is similar to that of the on-board station 91a in Fig. 2. Therefore, detailed description of the configuration of each of the on-board stations 91b and 91c will be omitted. Each of the on-board stations 91b and 91c includes a radio set 50.

[0031] (operation) Next, the operation of the wireless performance measurement system 100 according to the first embodiment will be described with reference to Fig. 1 and Fig. 2. In the following, the process for measuring the wireless performance of the wireless device 50, which is performed in the wireless performance measurement system 100, is also referred to as a "wireless performance measurement process."

[0032] First, the wireless performance measurement process for the wireless device 50 of the on-board station 91a will be described. The control unit C1 of the central device 90 specifies the wireless device 50 of the on-board station 91a to perform the wireless performance measurement process. The specified wireless device 50 is the wireless device to be measured.

[0033] In the wireless performance measurement process, the control unit C1 of the central device 90 transmits a measurement request signal RQ to the wireless device 50 of the on-board station 91a via the network N1. The measurement request signal RQ is a request to measure the wireless performance of the wireless device 50.

[0034] As a result, the control unit V1 of the radio 50 of the on-board station 91a receives the measurement request signal RQ. The radio 50 outputs a radio signal in response to a request from the central device 90. Specifically, upon receiving the measurement request signal RQ, the control unit V1 performs radio transmission control on the radio unit 12. The radio unit 12 outputs a radio signal in response to the radio transmission control.

[0035] The transmission power measuring unit 13 measures the transmission power, which is the power of the radio signal output from the radio unit 12. Measurement of the transmission power by the transmission power measuring unit 13 is triggered by the control unit V1 receiving a measurement request signal RQ.

[0036] Hereinafter, the transmission power measured by the transmission power measuring unit 13 is also referred to as the "measurement result P." The measurement result P is the transmission power. The unit of the measurement result P is dBm. Hereinafter, the information indicating the measurement result P is also referred to as the "transmission power measurement result RS1" or "RS1."

[0037] The transmission power measurement unit 13 stores the transmission power measurement result RS1 indicating the measurement result P in the recording unit V2.

[0038] Thereafter, the control unit V1 of the wireless device 50 transmits a transmission power measurement result RS1 indicating the measurement result P to the central unit 90 via the network N1. That is, the wireless device 50, which is an on-board station wireless device, notifies the central unit 90 of the measurement result P, which is the measured transmission power. As a result, the control unit C1 of the central unit 90 receives the transmission power measurement result RS1.

[0039] Hereinafter, information for identifying the radio 50 of the on-board station 91 is also referred to as "unique information" or "radio unique information." The unique information is, for example, an individual number. The unique information of the radio 50 included in each of the on-board stations 91a, 91b, and 91c is different. For example, the unique information of the radio 50 included in the on-board station 91a is different from the unique information of the radio 50 included in the on-board station 91b.

[0040] The control unit C1 that has received the transmission power measurement result RS1 performs a result storage process. In the result storage process, the control unit C1 adds the unique information of the radio 50 of the on-board station 91a designated by the control unit C1 to the transmission power measurement result RS1, and stores the transmission power measurement result RS1 in the recording unit C2. Here, the measurement result P indicated by the transmission power measurement result RS1 is information notified to the central device 90 from the radio 50 that is the on-board station radio.

[0041] In the wireless performance measurement process, the monitoring unit 3 performs the performance monitoring process. The monitoring unit 3 has a function of detecting wireless performance degradation or a sign of wireless performance degradation based on the measurement result P notified from the wireless device 50, which is an on-board station wireless device.

[0042] In the performance monitoring process, the monitoring unit 3 monitors the measurement result P indicated by the transmission power measurement result RS1 stored in the recording unit C2.

[0043] Hereinafter, the threshold value for detecting wireless performance degradation using the measurement result P is also referred to as "threshold value Tp1" or "Tp1". The unit of the threshold value Tp1 is dBm. The threshold value Tp1 is, for example, "+24". The threshold value Tp1 is, for example, a threshold value defined in the system.

[0044] Also, hereinafter, the threshold value for detecting a sign of wireless performance degradation using the measurement result P is also referred to as "threshold value Tp2" or "Tp2". The unit of the threshold value Tp2 is dBm. The threshold value Tp2 is larger than the threshold value Tp1. The threshold value Tp2 is, for example, "+27".

[0045] In the performance monitoring process, when the measurement result P is less than the threshold value Tp1, the monitoring unit 3 detects that there is wireless performance degradation. Also, when the relational expression Tp1 ≤ measurement result P < Tp2 holds, the monitoring unit 3 detects that there is a sign of wireless performance degradation. For example, when the measurement result P is "+26", the monitoring unit 3 detects that there is a sign of wireless performance degradation.

[0046] Also, in the performance monitoring process, when wireless performance degradation or a sign of wireless performance degradation is detected, external output processing is performed.

[0047] Hereinafter, the detection result of wireless performance degradation or a sign of wireless performance degradation is also referred to as the "degradation-related detection result". The degradation-related detection result in the situation where wireless performance degradation is detected is the result that wireless performance degradation has been detected. The degradation-related detection result in the situation where a sign of wireless performance degradation is detected is the result that a sign of wireless performance degradation has been detected.

[0048] In the external output process, the central device 90 outputs the deterioration-related detection result to the outside. For example, the deterioration-related detection result is output to the outside by displaying an image or text representing the deterioration-related detection result. Also, for example, the deterioration-related detection result is output to the outside by outputting a voice or a notification sound representing the deterioration-related detection result.

[0049] By carrying out the external output process, the central device 90 can check for degradation in wireless performance or a sign of degradation in wireless performance.

[0050] In the external output process, the central device 90 may transmit the degradation-related detection result to an external device. This allows wireless performance degradation or a sign of wireless performance degradation to be confirmed in places other than the vehicle and the central device.

[0051] The wireless performance measurement process is performed as described above. In the wireless performance measurement process, the central unit 90 designates the on-board station wireless device and measures the transmission power by remote control. The central unit 90 also manages the measurement results.

[0052] In the above, a radio of a specific on-board station (for example, the radio 50 of the on-board station 91a) is designated to perform the radio performance measurement process, but the radios of multiple on-board stations may be designated sequentially. For example, as shown in Fig. 1, the radio 50 of the on-board station 91b and the radio 50 of the on-board station 91c connected to the network N1 may be designated sequentially by the central device 90 to perform the same process as the above radio performance measurement process. This makes it possible to measure the transmission power of multiple radios.

[0053] (effect) As described above, according to this embodiment, the radio 50, which is an on-board radio, outputs a radio signal. The radio 50 measures the transmission power, which is the power of the radio signal. The radio 50 notifies the central device 90 of the measurement result, which is the measured transmission power.

[0054] This makes it possible to measure the wireless performance of the radio installed in the vehicle without having to send a worker to the vehicle.

[0055] According to the present embodiment, a system is constructed in which a wireless device notifies a central device of measurement results relating to the wireless performance of the wireless device, and the central device processes and manages the measurement results, thereby realizing remote wireless performance measurement.

[0056] Furthermore, according to this embodiment, the wireless performance measurement process is performed, and the transmission power of the wireless device 50 of the on-board station 91 mounted on the train car can be measured by remote control. This eliminates the need to dispatch an operator to the car. In other words, the wireless performance of the wireless device mounted on the car can be measured without dispatching an operator to the car.

[0057] <Embodiment 2> Measurement of transmission power has been described in the first embodiment. In the present embodiment, measurement of frequency deviation will be described. Frequency deviation is one of the main items in measuring the performance of a wireless device.

[0058] (System Configuration) 3 is a diagram showing a configuration of a wireless performance measurement system 100A according to embodiment 2. The wireless performance measurement system 100A is different from the wireless performance measurement system 100 in that the wireless performance measurement system 100A further includes a measurement device 92. Other configurations of the wireless performance measurement system 100A are similar to those of the wireless performance measurement system 100.

[0059] The wireless performance measurement system 100A includes a central device 90, a plurality of on-board stations 91, and a measurement device 92. As an example, three on-board stations 91 are shown in Fig. 3. Note that the number of on-board stations 91 included in the wireless performance measurement system 100A is not limited to three, and may be one, two, four or more.

[0060] The on-board station 91 includes a radio set 50. Hereinafter, the three on-board stations 91 shown in Fig. 3 are also referred to as on-board stations 91a, 91b, and 91c, respectively. The wireless performance measurement system 100A includes the on-board stations 91a, 91b, and 91c.

[0061] The measuring device 92 is installed on the ground. The measuring device 92 has a function of performing communication. The measuring device 92 has a function of performing wireless communication with each of the radios 50 of the on-board stations 91a, 91b, and 91c. The on-board stations 91a, 91b, and 91c are present within a coverage range Rg1 of the measuring device 92. The coverage range Rg1 is an area in which the measuring device 92 can perform wireless communication.

[0062] The measuring device 92 has the function of communicating with the central device 90 via the network N1.

[0063] (Device Configuration) Fig. 4 is a block diagram showing configurations of a central device 90, an on-board station 91, and a measuring device 92 according to the embodiment 2. Fig. 4 shows the on-board station 91 as an on-board station 91a as an example.

[0064] The measurement device 92 includes a control unit R1, a recording unit R2, a wireless measurement analysis unit 23, and a wireless performance measuring instrument 22. The recording unit R2 has a function of storing information.

[0065] The control unit R1 has various functions. For example, the control unit R1 has a function of communicating with the central device 90 via the network N1. The control unit R1 has a function of transmitting information stored in the recording unit R2 to the central device 90 via the network N1.

[0066] The wireless performance measuring instrument 22 is, for example, a spectrum analyzer. The wireless performance measuring instrument 22 is connected to an antenna At2. The antenna At2 has a function of receiving a wireless signal output from the wireless device 50 of the on-board station 91. The wireless performance measuring instrument 22 has a function of measuring the frequency of the wireless signal received by the antenna At2.

[0067] The wireless performance measuring instrument 22 has a function of notifying the wireless measurement analysis unit 23 of the measured frequency.

[0068] The wireless measurement analysis unit 23 has a function of calculating and measuring the frequency deviation of the wireless signal from the measured frequency.

[0069] In the following, the time when the frequency deviation of the wireless signal is measured by the wireless measurement analysis unit 23 is also referred to as "measurement time B." In addition, in the following, the time when the wireless signal is received by the antenna At2 is also referred to as "reception time." Measurement time B almost coincides with the reception time. In other words, measurement time B corresponds to the reception time.

[0070] The time when a radio signal is output from the radio set 50 of the on-board station 91 is the aforementioned transmission time. In a situation where the radio signal output from the radio set 50 is received by the antenna At2, the transmission time when the radio signal is output from the radio set 50 almost coincides with the reception time when the radio signal is received by the antenna At2. Therefore, for the same radio signal, the aforementioned measurement time A, which corresponds to the transmission time, almost coincides with measurement time B, which corresponds to the reception time. However, if the radio signal corresponding to measurement time A is different from the radio signal corresponding to measurement time B, measurement time A does not almost coincide with measurement time B.

[0071] Hereinafter, the frequency deviation measured by the wireless measurement analysis unit 23 is also referred to as "measurement result F." The measurement result F is a frequency deviation. The unit of the measurement result F is ppm. Hereinafter, information indicating the measurement result F is also referred to as "frequency deviation measurement result RS2" or "RS2."

[0072] The wireless measurement analysis unit 23 has a function of adding a measurement time B, which corresponds to the reception time, to the frequency deviation measurement result RS2 as the measurement time.

[0073] (operation) Next, the operation of the wireless performance measurement system 100A according to the second embodiment will be described with reference to Fig. 3 and Fig. 4. In the following, the process for measuring the wireless performance of the wireless device 50, which is performed in the wireless performance measurement system 100A, is also referred to as "wireless performance measurement process A".

[0074] First, the wireless performance measurement process A for the wireless device 50 of the on-board station 91a will be described. The control unit C1 of the central device 90 specifies the wireless device 50 of the on-board station 91a, and the wireless performance measurement process A is performed.

[0075] In the wireless performance measurement process A, the control unit C1 of the central device 90 transmits a measurement request signal RQ to the wireless device 50 of the on-board station 91a via the network N1.

[0076] As a result, the control unit V1 of the radio 50 of the on-board station 91a receives the measurement request signal RQ. The radio 50 outputs a radio signal in response to a request from the central device 90. Specifically, the control unit V1 that receives the measurement request signal RQ performs radio transmission control on the radio unit 12. The radio unit 12 outputs a radio signal in response to the radio transmission control. The radio signal output from the radio unit 12 is output to the outside of the radio 50 of the on-board station 91a via the antenna At1. That is, the radio 50 outputs the radio signal to the outside of the radio 50.

[0077] The radio signal output from the radio set 50 of the on-board station 91a is received by the antenna At2 of the measurement device 92. That is, the measurement device 92 receives the radio signal output from the radio set 50 which is the on-board station radio set.

[0078] The wireless performance measurer 22 measures the frequency of the wireless signal received by the antenna At2. The wireless performance measurer 22 notifies the wireless measurement analysis unit 23 of the measured frequency.

[0079] The wireless measurement analysis unit 23 calculates and measures the frequency deviation of the wireless signal from the measured frequency. That is, the wireless measurement analysis unit 23 measures the frequency deviation of the wireless signal. The wireless measurement analysis unit 23 stores the frequency deviation measurement result RS2 indicating the measurement result F, which is the frequency deviation, in the recording unit R2.

[0080] Thereafter, the control unit R1 of the measuring device 92 transmits the frequency deviation measurement result RS2 stored in the recording unit R2 to the central unit 90 via the network N1. The frequency deviation measurement result RS2 indicates the measurement result F, which is a frequency deviation. That is, the measuring device 92 notifies the central unit 90 of the measurement result F, which is the measured frequency deviation. As a result, the control unit C1 of the central unit 90 receives the frequency deviation measurement result RS2 indicating the measurement result F.

[0081] The control unit C1, which has received the frequency deviation measurement result RS2, performs a result storage process A. In the result storage process A, the control unit C1 adds the unique information of the radio set 50 of the on-board station 91a, which the control unit C1 has specified, to the frequency deviation measurement result RS2, and stores the frequency deviation measurement result RS2 in the recording unit C2. The measurement result F indicated by the frequency deviation measurement result RS2 is information notified from the measuring device 92 to the central unit 90.

[0082] In the wireless performance measurement process A, the monitoring unit 3 performs the performance monitoring process A. The monitoring unit 3 has a function of detecting wireless performance degradation or a sign of wireless performance degradation based on the measurement result F notified from the measurement device 92.

[0083] In the performance monitoring process A, the monitor 3 monitors the measurement result F indicated by the frequency deviation measurement result RS2 stored in the recording unit C2.

[0084] Hereinafter, the threshold for detecting wireless performance degradation using the measurement result F is also referred to as "threshold Tf1" or "Tf1". The unit of threshold Tf1 is ppm. For example, threshold Tf1 is "±10". For example, threshold Tf1 is a threshold specified in the system.

[0085] In the following, the threshold for detecting a sign of wireless performance degradation using the measurement result F is also referred to as "threshold Tf2" or "Tf2". The unit of threshold Tf2 is ppm. The absolute value of threshold Tf2 is smaller than the absolute value of threshold Tf1. Threshold Tf2 is, for example, "±3".

[0086] In performance monitoring process A, if the absolute value of measurement result F is greater than the absolute value of threshold value Tf1, monitoring unit 3 detects that there is wireless performance degradation. Also, if the relational expression "absolute value of Tf2<absolute value of measurement result F≦absolute value of Tf1" is established, monitoring unit 3 detects that there is a sign of wireless performance degradation. For example, if measurement result F is "+4", monitoring unit 3 detects that there is a sign of wireless performance degradation.

[0087] Furthermore, when wireless performance degradation or a sign of wireless performance degradation is detected in the performance monitoring process A, the above-mentioned external output process is performed. In the external output process, the central device 90 outputs the degradation-related detection result to the outside. The external output process is the same process as in the first embodiment, so a description thereof will be omitted.

[0088] As described above, the wireless performance measurement process A is performed. In the wireless performance measurement process A, the central unit 90 designates the radio equipment of the on-board station and measures the frequency deviation of the wireless signal by remote control. The measurement results are stored in the central unit 90, and the measurement results are managed by the central unit 90.

[0089] 3, the radio set 50 of the on-board station 91b and the radio set 50 of the on-board station 91c connected to the network N1 may be sequentially designated by the central device 90 to perform the same process as the above-mentioned radio performance measurement process A. This makes it possible to measure the frequency deviations in a plurality of radio sets.

[0090] (effect) As described above, according to this embodiment, the measuring device 92 receives a radio signal output by the radio device 50, which is an on-board radio device. The measuring device 92 measures the frequency deviation of the radio signal. The measuring device 92 notifies the central device 90 of the measurement result, which is the measured frequency deviation.

[0091] This makes it possible to measure the wireless performance of the radio installed in the vehicle without having to send a worker to the vehicle.

[0092] According to the present embodiment, a system is constructed in which the measurement device notifies the central device of the measurement results related to the wireless performance of the wireless device, and the central device processes and manages the measurement results, thereby realizing remote wireless performance measurement.

[0093] Furthermore, according to this embodiment, by performing the wireless performance measurement process A, it is possible to remotely measure the frequency deviation of the wireless device 50 of the on-board station 91 mounted on the train car. This makes it unnecessary to dispatch an operator to the train car. In other words, it is possible to measure the wireless performance of the wireless device mounted on the train car without dispatching an operator to the train car.

[0094] <Embodiment 3> In the first embodiment, the central unit 90 transmits a measurement request signal RQ to the radio of each on-board station, the radio 50 measures the transmission power, and the radio 50 notifies the central unit 90 of the measurement result.

[0095] In this embodiment, while the radio equipment of each on-board station is in operation, the transmission power is automatically measured and the measurement result is notified to the central device 90.

[0096] (System Configuration) Fig. 5 is a diagram showing a configuration of a wireless performance measurement system 100B according to the third embodiment. The configuration of the wireless performance measurement system 100B is the same as the configuration of the wireless performance measurement system 100 in Fig. 1. Therefore, the wireless performance measurement system 100B includes on-board stations 91a, 91b, and 91c. In Fig. 5, an arbitrary on-board station is shown. In Fig. 5, the on-board station 91a is shown as an example of the arbitrary on-board station.

[0097] The radio set 50 of the on-board station 91a communicates with the central device 90 via the network N1. When the radio set 50 of the on-board station 91a is in operation, the radio performance of the radio set 50 is measured.

[0098] (Device Configuration) Fig. 6 is a block diagram showing the configurations of a central device 90 and an on-board station 91 according to embodiment 3. In Fig. 6, an on-board station 91a is shown as an example.

[0099] The configurations of the central unit 90 and the on-board station 91 according to the third embodiment are the same as those of the central unit 90 and the on-board station 91 according to the first embodiment.

[0100] (operation) Next, the operation of the wireless performance measurement system 100B according to the third embodiment will be described with reference to Fig. 6. In the following, the process for measuring the wireless performance of the wireless device 50, which is performed in the wireless performance measurement system 100B, is also referred to as "wireless performance measurement process B".

[0101] Here, the wireless performance measurement process B when the wireless device 50 of the on-board station 91a is operated will be described. In the following, the period during which the wireless device 50, which is the on-board station wireless device, is operated will also be referred to as the "operation period." The operation period is the period during which the wireless device 50 is performing wireless communication.

[0102] In the wireless performance measurement process B, when the operation of the wireless device 50 is started in the on-board station 91a, the wireless unit 12 outputs a wireless signal.

[0103] During the operation period, the transmission power measuring unit 13 measures the transmission power, which is the power of the radio signal output from the radio unit 12. The transmission power measuring unit 13 stores the transmission power measurement result RS1 indicating the measurement result P, which is the transmission power, in the recording unit V2.

[0104] Thereafter, the control unit V1 of the wireless device 50 adds the measurement time as the above-mentioned measurement time A and the unique information of the wireless device 50 to the transmission power measurement result RS1. The unique information is, for example, an individual number. As a result, the transmission power measurement result RS1 indicates the measurement result P, the measurement time, and the unique information.

[0105] The control unit V1 of the wireless device 50 transmits the measurement result P, the measurement time, and the transmission power measurement result RS1 indicating the unique information to the central unit 90 via the network N1. As a result, the control unit C1 of the central unit 90 receives the transmission power measurement result RS1.

[0106] The control unit C1 receives the transmission power measurement result RS1 and stores the transmission power measurement result RS1, which indicates the measurement result P, the measurement time, and the unique information, in the recording unit C2.

[0107] In addition, in the wireless performance measurement process B, the monitor 3 performs a performance monitoring process. The performance monitoring process is performed in the same manner as in embodiment 1. The performance monitoring process is the same as in embodiment 1, so a description thereof will be omitted.

[0108] Furthermore, if degradation of wireless performance or a sign of degradation of wireless performance is detected in the performance monitoring process, the above-mentioned external output process is performed. The external output process is the same as that in the first embodiment, so a description thereof will be omitted.

[0109] As described above, the wireless performance measurement process B is performed. The wireless performance measurement process B is similarly performed for the wireless set 50 of the on-board station 91b and the wireless set 50 of the on-board station 91c.

[0110] (effect) As described above, according to the present embodiment, the wireless device 50 measures the transmission power during an operation period in which the wireless device 50 is in operation. Therefore, it is possible to detect degradation of wireless performance or a sign of degradation of wireless performance at an early stage.

[0111] Furthermore, by performing the wireless performance measurement process B, the transmission power of the wireless device 50 of the on-board station 91 mounted on the train car is measured during the operation period. This eliminates the need to dispatch a worker to the car. In other words, the wireless performance of the wireless device mounted on the train can be measured without dispatching a worker to the train.

[0112] In this embodiment, every time the radio 50 of the on-board station 91a outputs a radio signal, it transmits the transmission power measurement result RS1 as data to the central unit 90. However, this is not limited to this. For example, the radio 50 may store data in the recording unit V2, and when the radio 50 receives a data request signal from the control unit C1 of the central unit 90, the radio 50 may transmit the transmission power measurement result RS1 as data.

[0113] <Fourth embodiment> In the second embodiment, the central device 90 transmits a request signal to the radio of each on-board station, causing the radio to output a radio signal, and the radio signal is received by a measuring device and analyzed to measure the frequency deviation.

[0114] In this embodiment, while the radio equipment of each on-board station is in operation, the measuring device automatically measures the frequency deviation and notifies the central unit of the measurement result.

[0115] (System Configuration) Fig. 7 is a diagram showing a configuration of a wireless performance measurement system 100C according to a fourth embodiment. The configuration of the wireless performance measurement system 100C is the same as the configuration of the wireless performance measurement system 100A in Fig. 3. Therefore, the wireless performance measurement system 100C includes on-board stations 91a, 91b, and 91c. In Fig. 7, an arbitrary on-board station is shown. In Fig. 7, the on-board station 91a is shown as an example of the arbitrary on-board station.

[0116] The radio set 50 of the on-board station 91a communicates with the central device 90 via the network N1. When the radio set 50 of the on-board station 91a is in operation, the measuring device 92 measures the radio performance of the radio set 50.

[0117] (Device Configuration) Fig. 8 is a block diagram showing configurations of a central device 90, an on-board station 91, and a measuring device 92 according to the embodiment 4. In Fig. 8, the on-board station 91 is shown as an on-board station 91a as an example.

[0118] The configurations of the central unit 90, the on-board station 91 and the measurement device 92 according to the fourth embodiment are the same as the configurations of the central unit 90, the on-board station 91 and the measurement device 92 according to the second embodiment.

[0119] (operation) Next, the operation of the wireless performance measurement system 100C according to the fourth embodiment will be described with reference to Fig. 8. In the following, the process for measuring the wireless performance of the wireless device 50, which is performed in the wireless performance measurement system 100C, is also referred to as "wireless performance measurement process C".

[0120] Here, a wireless performance measurement process C when the wireless device 50 of the on-board station 91a is operated will be described.

[0121] In the wireless performance measurement process C, when the operation of the wireless device 50 is started in the on-board station 91a, the wireless unit 12 outputs a wireless signal. The wireless signal output from the wireless unit 12 is output to the outside of the wireless device 50 of the on-board station 91a via the antenna At1.

[0122] A radio signal output from the radio set 50 of the on-board station 91a is received by the antenna At2 of the measurement device 92. During the operation period, the radio performance measurer 22 measures the frequency of the radio signal received by the antenna At2. The radio performance measurer 22 notifies the radio measurement analysis unit 23 of the measured frequency.

[0123] During the operation period, the wireless measurement analysis unit 23 calculates and measures the frequency deviation of the wireless signal from the measured frequency. That is, during the operation period, the wireless measurement analysis unit 23 measures the frequency deviation of the wireless signal. The wireless measurement analysis unit 23 stores in the recording unit R2 the frequency deviation measurement result RS2 indicating the measurement time as the above-mentioned measurement time B and the measurement result F which is the frequency deviation.

[0124] The control unit R1 of the measuring device 92 transmits the frequency deviation measurement result RS2 indicating the measurement time and the measurement result F to the central unit 90 via the network N1. The timing of the transmission is, for example, when the frequency deviation measurement result RS2 is stored in the recording unit R2. Note that the timing of the transmission may be, for example, after the frequency deviation measurement result RS2 is stored in the recording unit R2.

[0125] The control unit C1 of the central unit 90 receives the frequency deviation measurement result RS2 indicating the measurement time and the measurement result F. The control unit C1 stores the frequency deviation measurement result RS2 in the recording unit C2.

[0126] In addition, in the wireless performance measurement process C, the monitor 3 performs a performance monitoring process A. The performance monitoring process A is performed in the same manner as in embodiment 2. Since the performance monitoring process A is the same as in embodiment 2, a description thereof will be omitted.

[0127] Furthermore, the above-mentioned external output process is performed when degradation of wireless performance or a sign of degradation of wireless performance is detected in the performance monitoring process A. The external output process is the same as that in the first embodiment, and therefore a description thereof will be omitted.

[0128] As described above, the wireless performance measurement process C is performed. The wireless performance measurement process C is similarly performed for the wireless set 50 of the on-board station 91b and the wireless set 50 of the on-board station 91c.

[0129] (effect) As described above, according to the present embodiment, the measuring device 92 measures the frequency deviation during the operation period in which the wireless device 50 is in operation. Therefore, it is possible to detect degradation of wireless performance or a sign of degradation of wireless performance at an early stage.

[0130] Furthermore, by performing the wireless performance measurement process C, the wireless performance (i.e., frequency deviation) of the wireless device 50 of the on-board station 91 mounted on the train car is measured during the operation period. This eliminates the need to dispatch a worker to the car. In other words, the wireless performance of the wireless device mounted on the car can be measured without dispatching a worker to the car.

[0131] In this embodiment, the measuring device 92 transmits the frequency deviation measurement result RS2 as data to the central unit 90 every time the measuring device 92 receives a radio signal. However, this is not limiting. For example, the measuring device 92 may store data in the recording unit R2 and transmit the frequency deviation measurement result RS2 as data when the measuring device 92 receives a data request signal from the central unit 90.

[0132] <Fifth Preferred Embodiment> In the fourth embodiment, the process of measuring the frequency deviation during operation of the wireless device has been described. In the fourth embodiment, it is difficult to identify from which on-board wireless device the wireless signal received by the measuring device 92 has come.

[0133] In this embodiment, by combining the third embodiment and the fourth embodiment, a method for identifying which on-board station radio equipment a received radio signal is from will be described. Specifically, a method for identifying which radio equipment is responsible for the measurement results obtained while a radio equipment in operation is being used will be described.

[0134] (System Configuration) Fig. 9 is a diagram showing a configuration of a wireless performance measurement system 100D according to the fifth embodiment. The configuration of the wireless performance measurement system 100D in Fig. 9 is the same as the configuration of the wireless performance measurement system 100A in Fig. 3. Therefore, the wireless performance measurement system 100D includes on-board stations 91a, 91b, and 91c. In Fig. 9, an arbitrary on-board station is shown. In Fig. 9, the on-board station 91a is shown as an example of the arbitrary on-board station.

[0135] (Device Configuration) The configurations of the central unit 90, the on-board station 91, and the measuring device 92 according to the fifth embodiment are the same as those shown in FIG.

[0136] FIG. 10 is a block diagram showing a configuration of a central device 90 according to the fifth embodiment.

[0137] In the following, the transmission power measurement result RS1 obtained using the radio 50 of the on-board station 91a is also referred to as the "transmission power measurement result RS1a" or "RS1a." In addition, in the following, the frequency deviation measurement result RS2 obtained using the radio 50 of the on-board station 91a is also referred to as the "frequency deviation measurement result RS2a" or "RS2a." In addition, in the following, information obtained from the transmission power measurement result RS1a and the frequency deviation measurement result RS2a is also referred to as the "general information RS3a."

[0138] In the following, the transmission power measurement result RS1 obtained using the radio 50 of the on-board station 91c is also referred to as the "transmission power measurement result RS1c" or "RS1c." In the following, the frequency deviation measurement result RS2 obtained using the radio 50 of the on-board station 91c is also referred to as the "frequency deviation measurement result RS2c" or "RS2c." In the following, information obtained from the transmission power measurement result RS1c and the frequency deviation measurement result RS2c is also referred to as the "general information RS3c."

[0139] 10, the recording section C2 shows, as an example, a transmission power measurement result RS1a, a frequency deviation measurement result RS2a, and general information RS3a. Also, the recording section C2 shows, as an example, a transmission power measurement result RS1c, a frequency deviation measurement result RS2c, and general information RS3c.

[0140] The control unit C1 performs a linking process, which will be described in detail later. The monitoring unit 3 monitors the general information, which will be described in detail later.

[0141] (operation) Next, the operation of the wireless performance measurement system 100D according to the fifth embodiment will be described with reference to Fig. 8, Fig. 9, and Fig. 10. In the following, the process for measuring the wireless performance of the wireless device 50, which is performed in the wireless performance measurement system 100D, is also referred to as "wireless performance measurement process D".

[0142] In the wireless performance measurement process D, the wireless performance measurement process B of the third embodiment is performed using the wireless device 50 of the on-board station 91a. As a result, the transmission power measurement result RS1a is transmitted to the central device 90, and the transmission power measurement result RS1a is stored in the recording unit C2. The transmission power measurement result RS1a indicates the measurement time, unique information, and measurement result P. As described above, the unique information is information for identifying the wireless device 50. The unique information is, for example, an individual number.

[0143] Moreover, the wireless performance measurement process B is performed using the wireless device 50 of the on-board station 91b. Moreover, the wireless performance measurement process B is performed using the wireless device 50 of the on-board station 91c. As a result, for example, the transmission power measurement result RS1c is transmitted to the central device 90, and the transmission power measurement result RS1c is stored in the recording unit C2.

[0144] In the wireless performance measurement process D, the wireless performance measurement process C of the fourth embodiment is performed using the wireless device 50 of the on-board station 91a. As a result, the frequency deviation measurement result RS2a is transmitted to the central unit 90 and stored in the recording unit C2. The frequency deviation measurement result RS2a indicates the measurement time and the measurement result F.

[0145] Moreover, the radio performance measurement process C is performed using the radio set 50 of the on-board station 91b. Moreover, the radio performance measurement process C is performed using the radio set 50 of the on-board station 91c. As a result, for example, the frequency deviation measurement result RS2c is transmitted to the central unit 90, and the frequency deviation measurement result RS2c is stored in the recording unit C2.

[0146] Next, the control unit C1 performs a linking process, in which the control unit C1 refers to the measurement times indicated by the multiple transmission power measurement results stored in the recording unit C2 and the measurement times indicated by the multiple frequency deviation measurement results stored in the recording unit C2.

[0147] The control unit C1 generates comprehensive information by linking together the transmission power measurement result and the frequency deviation measurement result that indicate almost the same measurement time, and stores the comprehensive information in the recording unit C2. The transmission power measurement result and the frequency deviation measurement result that indicate almost the same measurement time are information corresponding to the same wireless device 50.

[0148] 10, the control unit C1 generates general information RS3a by linking a transmission power measurement result RS1a and a frequency deviation measurement result RS2a that indicate almost the same measurement time, and stores the general information RS3a in the recording unit C2. The general information RS3a indicates the measurement time, specific information, measurement result P, and measurement result F. In the general information RS3a, the measurement result P and the measurement result F are associated with the specific information.

[0149] Also, for example, the control unit C1 generates comprehensive information RS3c by linking together the transmission power measurement result RS1c and the frequency deviation measurement result RS2c that indicate almost the same measurement time, and stores the comprehensive information RS3c in the recording unit C2. The comprehensive information RS3c indicates the measurement time, the unique information, the measurement result P, and the measurement result F.

[0150] In addition, in wireless performance measurement processing D, the monitoring unit 3 performs performance monitoring processing and performance monitoring processing A. The performance monitoring processing in this embodiment is performed based on the measurement result P indicated by the comprehensive information. The performance monitoring processing in this embodiment is similar to that in embodiment 1, so a description thereof will be omitted.

[0151] The performance monitoring process A of this embodiment is performed based on the measurement result F indicated by the overall information. The performance monitoring process A of this embodiment is similar to that of the second embodiment, and therefore a description thereof will be omitted.

[0152] When degradation of wireless performance or signs of degradation of wireless performance are detected by the performance monitoring process or the performance monitoring process A, the monitoring unit 3 can identify the wireless device 50 in which degradation of wireless performance or signs of degradation of wireless performance have been detected, by the unique information indicated by the comprehensive information.

[0153] Moreover, an external output process is performed when degradation of wireless performance or a sign of degradation of wireless performance is detected by the performance monitoring process or the performance monitoring process A. The external output process is the same process as in the first embodiment, and therefore a description thereof will be omitted.

[0154] The wireless performance measurement process D is performed as described above.

[0155] (effect) As described above, according to this embodiment, the transmission power measurement result and the frequency deviation measurement result are linked, so that the measurement result P and the measurement result F are associated with the unique information of each wireless device (see FIG. 10). This makes it possible to identify which wireless device the measurement result P and the measurement result F obtained while the wireless device in operation is being used are from.

[0156] (Example of wireless device hardware configuration) Hereinafter, the wireless performance measurement system according to the present technology will also be referred to as the "wireless performance measurement system Hs1." The wireless performance measurement system Hs1 is any one of the wireless performance measurement systems 100, 100A, 100B, 100C, and 100D. In addition, below, the main function related to the present technology that the wireless performance measurement system Hs1 has will also be referred to as the "main function." The wireless performance measurement system Hs1 has the main function.

[0157] 11 and 12 are diagrams showing examples of the hardware configuration of the wireless performance measurement system Hs1. The main functions of the wireless performance measurement system Hs1 are realized by, for example, one processing circuit 70 shown in FIG.

[0158] The processing circuit 70 measures the transmission power, which is the power of the radio signal.

[0159] The processing circuit 70 also notifies the central unit of the measurement result, which is the measured transmission power.

[0160] The processing circuit 70 also measures the frequency deviation of the radio signal.

[0161] The processing circuit 70 also notifies the central unit of the measurement result, which is the measured frequency deviation.

[0162] The processing circuit 70 may be a dedicated hardware. The processing circuit 70 may also be configured using a processor that executes a program stored in a memory. The processor is, for example, a CPU (Central Processing Unit), a central processing unit, an arithmetic unit, a microprocessor, a microcomputer, a DSP (Digital Signal Processor), or the like.

[0163] In the following, a situation in which the processing circuit 70 is dedicated hardware will also be referred to as a "situation St1." Also, in the following, a situation in which the processing circuit 70 is configured using a processor will also be referred to as a "situation St2."

[0164] In situation St1, the processing circuit 70 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 combination thereof.

[0165] Fig. 12 is a diagram showing an example of a hardware configuration of a wireless performance measurement system Hs1 in a situation St2 in which the processing circuit 70 is configured using a processor. The configuration in Fig. 12 is a configuration in which the processing circuit 70 in Fig. 11 is realized by a processor 71 and a memory 72.

[0166] In the situation St2, the main functions of the wireless performance measurement system Hs1 are realized by software A. The software A is software or firmware. The software A may also be configured as a combination of software and firmware. The software A is written as a program and stored in the memory 72.

[0167] In addition, in the state St2, the processor 71 reads out a program stored in the memory 72 and executes the program, thereby realizing the main functions of the wireless performance measuring system Hs1. That is, the memory 72 stores the following programs.

[0168] This program is a program for causing the processor 71 to execute a process of measuring the transmission power, which is the power of a wireless signal.

[0169] This program also causes the processor 71 to execute a process of notifying the central device of the measurement result, which is the measured transmission power.

[0170] The program also causes the processor 71 to execute a process for measuring the frequency deviation of a radio signal.

[0171] This program also causes the processor 71 to execute a process of notifying the central device of the measurement result, which is the measured frequency deviation.

[0172] The program also causes a computer to execute processes performed by the main functions of the wireless performance measuring system Hs1, methods for executing the processes, and the like.

[0173] Here, the memory 72 is, for example, a non-volatile or volatile semiconductor memory such as a random access memory (RAM), a read only memory (ROM), a flash memory, an EPROM, an EEPROM, etc. Also, the memory 72 is, for example, a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, a DVD, etc. Also, the memory 72 may be any storage medium that will be used in the future.

[0174] As described above, the wireless performance measurement system Hs1 can realize the above-mentioned functions by the hardware or software A.

[0175] The present technology may be realized as a wireless performance measurement method having steps corresponding to operations of characteristic components included in the wireless performance measurement system Hs1. The present technology may be realized as a program that causes a computer to execute each step included in the wireless performance measurement method.

[0176] The present technology may be realized as a computer-readable recording medium storing such a program. The program may be distributed via a transmission medium such as the Internet. The wireless performance measurement method according to the present technology corresponds to, for example, a wireless performance measurement process and any one of the wireless performance measurement processes A, B, C, and D.

[0177] (Other variations) It should be noted that the embodiments can be freely combined, and each embodiment can be modified or omitted as appropriate.

[0178] Various aspects of the present disclosure are summarized below as appendices.

[0179] (Appendix 1) A wireless performance measurement system, comprising: A central device; an on-board station radio that is a radio included in an on-board station mounted on a vehicle; the on-board radio has a function of communicating with the central device via a network, The on-board radio unit outputs a radio signal, The on-board radio unit measures a transmission power, which is the power of the radio signal, The on-board radio unit notifies the central device of a measurement result, which is the measured transmission power. Wireless performance measurement system.

[0180] (Appendix 2) The on-board radio unit outputs the radio signal in response to a request from the central device. 2. A wireless performance measurement system as claimed in claim 1.

[0181] (Appendix 3) During a period in which the on-board station wireless device is in operation, the on-board station wireless device measures the transmission power. 2. A wireless performance measurement system as claimed in claim 1.

[0182] (Appendix 4) the central device has a function of detecting degradation of radio performance of the on-board station radio device or a sign of degradation of radio performance of the on-board station radio device based on the measurement result notified from the on-board station radio device. 2. A wireless performance measurement system as claimed in claim 1.

[0183] (Appendix 5) the central device outputs a detection result of the deterioration of the wireless performance or a sign of the deterioration of the wireless performance to an external device. 5. A wireless performance measurement system as claimed in claim 4.

[0184] (Appendix 6) A wireless performance measurement system, comprising: A central device; An on-board station radio that is a radio included in an on-board station mounted on a vehicle; a measuring device having a function of communicating with the central device via a network; The measuring device receives a radio signal output from the on-board radio device, the measurement device measures a frequency deviation of the radio signal; the measurement device notifies the central device of a measurement result, which is the measured frequency deviation; Wireless performance measurement system.

[0185] (Appendix 7) The on-board radio unit outputs the radio signal in response to a request from the central device. 7. A wireless performance measurement system as claimed in claim 6.

[0186] (Appendix 8) The measuring device measures a frequency deviation of the radio signal during a period in which the on-board radio is in operation. 7. A wireless performance measurement system as claimed in claim 6.

[0187] (Appendix 9) The central device has a function of detecting degradation of radio performance of the on-board station radio device or a sign of degradation of the radio performance of the on-board station radio device based on the measurement result notified from the measurement device. 7. A wireless performance measurement system as claimed in claim 6.

[0188] (Appendix 10) the central device outputs a detection result of the deterioration of the wireless performance or a sign of the deterioration of the wireless performance to an external device. 10. A wireless performance measurement system as claimed in claim 9. [Explanation of symbols]

[0189] 50 radio, 70 processing circuit, 71 processor, 72 memory, 90 central unit, 91, 91a, 91b, 91c on-board station, 92 measuring device, 100, 100A, 100B, 100C, 100D, Hs1 radio performance measuring system.

Claims

1. A wireless performance measurement system, comprising: A central device; an on-board station radio that is a radio included in an on-board station mounted on a vehicle; a measuring device having a function of communicating with the central device via a network, The measuring device is receiving the radio signal output by the on-board radio; measuring a frequency deviation of the radio signal; notifying the central device of a first measurement result, which is the measured frequency deviation; Wireless performance measurement system.

2. the central device has a function of detecting degradation of the radio performance of the on-board station radio device or a sign of degradation of the radio performance of the on-board station radio device based on the first measurement result notified from the measurement device.

2. The wireless performance measurement system according to claim 1.

3. the central device outputs a detection result of the deterioration of the wireless performance or a sign of the deterioration of the wireless performance to an external device.

3. The wireless performance measurement system according to claim 2.

4. The measuring device measures the frequency deviation of the radio signal while the on-board radio is in operation.

4. The wireless performance measurement system according to claim 1.

5. The on-board radio equipment comprises: having a function of communicating with the central device via a network; It outputs a wireless signal, measuring a transmission power of the wireless signal; notifying the central device of a second measurement result, which is the measured transmission power; 4. The wireless performance measurement system according to claim 1.

6. the central device has a function of detecting degradation of radio performance of the on-board station radio device or a sign of degradation of radio performance of the on-board station radio device based on the second measurement result notified from the on-board station radio device.

6. The wireless performance measurement system according to claim 5.

7. the central device outputs a detection result of the deterioration of the wireless performance or a sign of the deterioration of the wireless performance to an external device.

7. The wireless performance measurement system according to claim 6.

8. The on-board radio measures the transmission power while the on-board radio is in operation.

6. The wireless performance measurement system according to claim 5.

9. A wireless performance measurement system, comprising: A central device; an on-board station radio that is a radio included in an on-board station mounted on the vehicle; The on-board radio equipment is having a function of communicating with the central device via a network; It outputs a wireless signal, measuring a transmission power of the wireless signal; notifying the central device of the measurement result, which is the measured transmission power; Wireless performance measurement system.

10. The central device has a function of detecting degradation of the radio performance of the on-board station radio device or a sign of degradation of the radio performance of the on-board station radio device based on the measurement result notified from the on-board station radio device.

10. The wireless performance measurement system according to claim 9.

11. the central device outputs a detection result of the deterioration of the wireless performance or a sign of the deterioration of the wireless performance to an external device.

11. The wireless performance measurement system of claim 10.

12. The on-board radio measures the transmission power while the on-board radio is in operation.

12. A wireless performance measurement system according to claim 9.

13. An antenna for receiving a radio signal output from an on-board station radio, which is a radio included in an on-board station mounted on a vehicle; a radio measurement analysis unit that measures a frequency deviation of the radio signal; a control unit that notifies a central device of a measurement result that is the measured frequency deviation, Measuring equipment.

14. Measure the frequency deviation of the radio signal while the on-board radio is in operation.

14. The measuring device of claim 13.

15. A control unit that receives from a measurement device a first measurement result that is a frequency deviation of a radio signal output by an on-board station radio that is a radio included in an on-board station mounted on a vehicle; a monitoring unit having a function of detecting a deterioration in the radio performance of the on-board station radio device or a sign of a deterioration in the radio performance of the on-board station radio device based on the first measurement result, Central device.

16. The control unit receives a second measurement result from the on-board radio, the second measurement result being the transmission power of the radio signal output by the on-board radio; the monitoring unit has a function of detecting degradation of the radio performance of the on-board station radio device or a sign of degradation of the radio performance of the on-board station radio device based on the second measurement result.

16. The central unit according to claim 15.

17. Having a function of outputting a detection result of the deterioration of the wireless performance or a sign of the deterioration of the wireless performance to an external device.

17. The central unit according to claim 15 or claim 16.

18. A control unit that receives a measurement result, which is the transmission power of a radio signal output from an on-board station radio that is a radio included in an on-board station mounted on a vehicle, from the on-board station radio; a monitoring unit having a function of detecting a deterioration in the radio performance of the on-board station radio device or a sign of a deterioration in the radio performance of the on-board station radio device based on the measurement results, Central device.

19. Having a function of outputting a detection result of the deterioration of the wireless performance or a sign of the deterioration of the wireless performance to an external device.

19. The central unit according to claim 18.

20. A radio included in an on-board station mounted on a vehicle, a radio unit that outputs a radio signal; a transmission power measurement unit for measuring a transmission power, which is the power of the wireless signal; a control unit that notifies the central device of a measurement result that is the measured transmission power, On-board radio station.

21. The transmission power measurement unit measures the transmission power of the radio signal while the on-board radio is in operation.

21. The on-board radio set according to claim 20.

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