On-vehicle server, ground server, wireless communication system, on-vehicle wireless communication mode control method, and ground wireless communication mode control method

Abstract

An on-vehicle server (30) is provided with: a first on-vehicle communication management unit (31) for determining whether or not it is possible to connect to a first communication network where the amount of communication restriction is set, and measuring a first cumulative communication amount in a first communication period through the first communication network; a second on-vehicle communication management unit (32) for determining whether or not it is possible to connect to a second communication network where the amount of communication restriction is set, and measuring a second cumulative communication amount in a second communication period through the second communication network; and an on-vehicle control unit (33) which calculates, on the basis of the determination results by the first on-vehicle communication management unit (31) and the second on-vehicle communication management unit (32), a first connection rate at which communication through the first communication network can be performed and a second connection rate at which communication through the second communication network can be performed to create an area map for each divided travel section, and controls transmission / reception of data through the first communication network and the second communication network in accordance with a transmission / reception schedule that is created on the basis of the area map, the amount of communication restriction, and data characteristics of the data.

Description

On-board server, ground server, wireless communication system, on-board wireless communication system control method, and ground wireless communication system control method

[0001] The present disclosure relates to an on-board server, a ground server, a wireless communication system, an on-board wireless communication system control method, and a ground wireless communication system control method used in wireless communication between a mobile body and ground equipment.

[0002] Conventionally, when two wireless communication devices are capable of performing wireless communication using a plurality of wireless communication methods, each wireless communication device selects a wireless communication method according to the communication state of each wireless communication method and performs wireless communication using an appropriate wireless communication method. For example, Patent Document 1 discloses a technology in which a user terminal performs wireless communication by switching between wireless lines of a plurality of communication carriers according to the communication state.

[0003] JP 2013-219438 A

[0004] In recent years, services have been provided by the same communication carrier using two different wireless communication methods. The wireless communication methods provided by such services often have limitations on the amount of communication traffic that can be used within a specified period, and the specified period and the amount of communication traffic that can be used often differ depending on the wireless communication method. Although Patent Document 1 does not take into consideration the limitation on the amount of communication traffic for each wireless communication method, if the location of the user terminal does not change, it is possible for the user to avoid exceeding the communication limit for each wireless communication method by appropriately switching between the wireless communication methods.

[0005] However, in a mobile wireless communication system in which the location of a user terminal moves, the communication status of each wireless communication method changes depending on the location of the user terminal, making it difficult for the user to appropriately change the wireless communication method depending on the communication status of each wireless communication method. Therefore, there is a problem that if the communication limit set for each wireless communication method is exceeded, delays, data loss, etc. may occur in data transmission and reception. Users can avoid exceeding the communication limit of each wireless communication method by selecting a contract plan that allows for high-capacity communication, but generally, the higher the contract plan that allows for high-capacity communication, the more expensive it becomes, resulting in high costs.

[0006] The present disclosure has been made in consideration of the above, and aims to provide an on-board server that controls the transmission and reception of data so that the communication volume of two wireless communication methods, which have communication volume limits within a specified communication period, does not exceed the limit.

[0007] In order to solve the above-mentioned problems and achieve the object, the present disclosure provides an on-board server that is mounted on a mobile body and controls transmission and reception of data to and from a ground server. The on-board server includes a first on-board communication management unit that determines whether or not the on-board server can connect to a first communication network in which a communication limit amount allowing communication up to a first communication amount in a first communication period is set, and measures a first cumulative communication amount in the first communication period by the first communication network, a second on-board communication management unit that determines whether or not the on-board server can connect to a second communication network in which a communication limit amount allowing communication up to a second communication amount in a second communication period is set, and measures a second cumulative communication amount in the second communication period by the second communication network, and a control unit that controls whether or not the on-board server can connect to a second communication network in which a communication limit amount allowing communication up to a second communication amount in a second communication period is set, and measures a second cumulative communication amount in the second communication period by the second communication network, based on the determination results of the first on-board communication management unit and the second on-board communication management unit. The system is characterized by comprising an on-board control unit that calculates a first connection rate indicating the proportion of driving sections in which communication via the first communication network is possible for each divided driving section into which the driving section of the mobile body is divided, and a second connection rate indicating the proportion of driving sections in which communication via the second communication network is possible, creates an area map indicating the first connection rate and the second connection rate for each divided driving section, and controls the transmission and reception of data via the first communication network and the second communication network in accordance with a transmission and reception schedule created based on the area map, the communication limit amount, and the data characteristics of the data.

[0008] The on-board server of the present disclosure has the advantage of being able to control the transmission and reception of data so that the communication volume of two wireless communication methods, which have communication volume limits within a specified communication period, does not exceed the limit.

[0009] FIG. 1 is a block diagram showing an example of the configuration of a wireless communication system according to the first embodiment; FIG. 2 is a diagram showing an image of a wireless communication area of ​​a train, which is shown in an area map created by an on-board control unit of an on-board server according to the first embodiment; FIG. 3 is a diagram showing an example of data transmission and reception by an on-board server according to the first embodiment;

[0010] Hereinafter, an on-board server, a ground server, a wireless communication system, an on-board wireless communication system control method, and a ground wireless communication system control method according to embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0011] 1 is a block diagram showing an example of the configuration of a wireless communication system 1 according to a first embodiment. The wireless communication system 1 includes an on-board server 30 mounted on a train 10 and a ground server 60 installed on the ground. The on-board server 30 is mounted on the train 10 and connected to a train information management device 21 and a wireless communication device 41 also mounted on the train 10. The ground server 60 is installed on the ground and connected to a WiMAX (Worldwide interoperability for Microwave Access) base station 51 and an LTE (Long Term Evolution) base station 52 also installed on the ground.

[0012] The train information management device 21 monitors and controls the status of the train 10. The train information management device 21 outputs data, etc., transmitted from the ground server 60 and received via the wireless communication device 41 and on-board server 30 of the train 10 to the display device 22 and the on-board device 23. The train information management device 21 also outputs data indicating the operating status of the on-board device 23, acquired from the on-board device 23, to the on-board server 30, and causes the on-board server 30 to transmit the data to the ground server 60 via the wireless communication device 41. The train information management device 21 is, for example, a TCMS (Train Control and Management System).

[0013] The display device 22 is installed above the door inside the carriage of the train 10, and displays advertisements, operation information, in-car guidance information, and the like obtained from the train information management device 21. In the example of Fig. 1, the train 10 is equipped with one display device 22, but in reality, it is assumed to be equipped with multiple display devices 22. It is not necessary for all the display devices 22 to display the same data, and the content of the data displayed may differ depending on the type of display device 22, installation location, etc.

[0014] The on-board device 23 operates in accordance with data transmitted from the ground server 60 and acquired from the train information control device 21. The on-board device 23 also outputs data indicating its operating status to the train information control device 21. In the example of Fig. 1, the train 10 is equipped with one on-board device 23, but in reality, the train 10 is equipped with multiple on-board devices 23. The on-board devices 23 include, for example, devices related to the running of the train 10, such as brakes, as well as devices that contribute to passenger comfort, such as air conditioners.

[0015] The wireless communication device 41 is a communication device capable of wireless communication using two wireless communication methods provided by the same communication carrier. In the first embodiment, WiMAX and LTE are assumed as the two wireless communication methods. That is, the wireless communication device 41 is capable of transmitting and receiving data using the two wireless communication methods, WiMAX and LTE. Under the control of the on-board server 30, the wireless communication device 41 transmits and receives data to and from a WiMAX base station 51 installed on the ground using the WiMAX wireless communication method, or transmits and receives data to and from an LTE base station 52 installed on the ground using the LTE wireless communication method. In the following description, the WiMAX wireless communication method may be referred to as a first communication network, and the LTE wireless communication method may be referred to as a second communication network.

[0016] The on-board server 30 is mounted on the train 10, which is a moving body, and controls the transmission and reception of data between the train 10 and the ground server 60. As shown in Fig. 1 , the on-board server 30 includes a first on-board communication management unit 31, a second on-board communication management unit 32, and an on-board control unit 33.

[0017] The first on-board communication management unit 31 manages the transmission and reception of wireless data via WiMAX, which is the first communication network. Specifically, the first on-board communication management unit 31 determines whether or not connection to WiMAX, which is the first communication network, is possible, and a communication limit is set that allows communication up to a first communication amount during a first communication period. The first on-board communication management unit 31 also measures a first cumulative communication amount during the first communication period via WiMAX, which is the first communication network. The data that is the subject of the first cumulative communication amount is data transmitted and received via WiMAX, which is the first communication network. A communication limit is set for WiMAX, and WiMAX allows transmission and reception of a cumulative 10 GB of data over three days. In other words, the first communication period is "three days," and the first communication amount is "10 GB." The first cumulative communication amount is accumulated each time data is transmitted and received. Therefore, in the on-board server 30, the on-board control unit 33 controls the transmission and reception of data via WiMAX so that the first cumulative communication volume for the first communication period does not exceed the first communication volume, i.e., the first cumulative communication volume for three days does not exceed 10 GB.

[0018] The second on-board communication management unit 32 manages the transmission and reception of wireless data via LTE, which is the second communication network. Specifically, the second on-board communication management unit 32 determines whether or not connection to LTE, which is the second communication network, is possible, in which a communication limit is set that allows communication up to a second communication amount during a second communication period. The second on-board communication management unit 32 also measures a second cumulative communication amount during the second communication period via LTE, which is the second communication network. The data that is the subject of the second cumulative communication amount is data transmitted and received via LTE, which is the second communication network. A communication limit is set for LTE, and LTE allows transmission and reception of a cumulative total of 7 GB of data per month. In other words, the second communication period is "one month," and the second communication amount is "7 GB." The second cumulative communication amount is accumulated each time data is transmitted and received. Therefore, in the on-board server 30, the on-board control unit 33 controls the transmission and reception of data via LTE so that the second cumulative communication volume for the second communication period does not exceed the second communication volume, i.e., the second cumulative communication volume for one month does not exceed 7 GB.

[0019] In this way, the first communication period of WiMAX, which is the first communication network, is shorter than the second communication period of LTE, which is the second communication network, and the first communication volume of WiMAX, which is the first communication network, is greater than the second communication volume of LTE, which is the second communication network.

[0020] The on-board control unit 33 calculates a first connectivity rate indicating the proportion of the running section where communication via WiMAX, which is the first communication network, is possible, and a second connectivity rate indicating the proportion of the running section where communication via LTE, which is the second communication network, is possible, for each divided running section into which the running section of the train 10, which is a moving body, is divided, based on the determination results of the first on-board communication management unit 31 and the determination results of the second on-board communication management unit 32. Each divided running section into which the running section of the train 10 is divided into multiple sections is a section separated by stations where the train 10 stops, and is a running section between adjacent stations where the train 10 stops.

[0021] The on-board control unit 33 determines whether the first on-board communication management unit 31 can connect to WiMAX, which is the first communication network, and whether the second on-board communication management unit 32 can connect to LTE, which is the second communication network. Therefore, the on-board control unit 33 can calculate the first connection rate and the second connection rate by obtaining the determination results from the first on-board communication management unit 31 and the second on-board communication management unit 32. Note that the on-board server 30 can also have the first on-board communication management unit 31 calculate the first connection rate and the second on-board communication management unit 32 calculate the second connection rate by having the first on-board communication management unit 31 and the second on-board communication management unit 32 store information on each divided running section. Hereinafter, an example will be described in which the on-board control unit 33 calculates the first connection rate and the second connection rate.

[0022] The on-board control unit 33 calculates the first connection rate and the second connection rate at a specified interval. Because the train 10 runs along the same track every time, the on-board control unit 33 may calculate the first connection rate and the second connection rate during the first run of each operating day, or may calculate the first connection rate and the second connection rate approximately once a week or once a month for a running section that does not change from day to day. Furthermore, when the first connection rate and the second connection rate change depending on the time of day, the on-board control unit 33 may use the first connection rate and the second connection rate calculated up to the previous day, or the average value of the first connection rate and the average value of the second connection rate calculated up to the previous day.

[0023] The on-board control unit 33 creates an area map indicating the first connection rate and the second connection rate for each divided traveling section. The on-board control unit 33 controls the transmission and reception of data via WiMAX, which is the first communication network, and LTE, which is the second communication network, in accordance with a transmission and reception schedule created based on the area map, the communication limit amount, and the data characteristics of the data. The communication limit amount targets the communication limit amounts set for WiMAX, which is the first communication network, and LTE, which is the second communication network. The data characteristics of the data include the amount of data transmitted and received between the on-board server 30 and the ground server 60, the real-time nature of the data, and the like. Hereinafter, the data characteristics of the data will be simply referred to as data characteristics.

[0024] Here, the area map created by the on-board control unit 33 of the on-board server 30 will be described. FIG. 2 is a diagram showing an image of the wireless communication area of ​​the train 10 shown in the area map created by the on-board control unit 33 of the on-board server 30 according to the first embodiment. FIG. 2 shows the positions of the train 10 where wireless communication via WiMAX is possible and the positions of the train 10 where wireless communication via LTE is possible in a running section of the train 10 traveling on the tracks 11 from Station A to Station D via Stations B and C. If the running section is from Station A to Station D, the divided running sections are from Station A to Station B, from Station B to Station C, and from Station C to Station D. The train 10 is capable of wireless communication via WiMAX in the running section from Station A to Station B to the section between Stations B and C closer to Station B, and is capable of wireless communication via LTE in the running section from Station A to Stations C and D. In this way, the first communication area connectable to the first communication network, WiMAX, is smaller than the second communication area connectable to the second communication network, LTE. Note that the on-board control unit 33 may store the created area map in a database format.

[0025] When expressing the connection state of wireless communication by WiMAX, the first connection rate of WiMAX between stations A and B on the train 10 is expressed as W ＡＢ (%), and the first connection rate of WiMAX between stations B and C is W ＢＣ (%), and the first connection rate of WiMAX between stations C and D is W ＣＤ In addition, when expressing the connection state of wireless communication by LTE, the second connection rate of LTE between stations A and B on the train 10 is expressed as L ＡＢ (%), and the second LTE connection rate between stations B and C is L ＢＣ (%), and the second LTE connection rate between stations C and D is L ＣＤThe on-board control unit 33 of the on-board server 30 transmits the created area map to the ground server 60 via the wireless communication device 41 and the WiMAX base station 51 or the LTE base station 52. As a result, the on-board server 30 and the ground server 60 share the same area map.

[0026] Next, a description will be given of data transmitted and received between the on-board server 30 and the ground server 60. In the first embodiment, three types of data are assumed to be transmitted and received between the on-board server 30 and the ground server 60.

[0027] The first data is the advertising content Dc transmitted from the ground server 60 to the on-board server 30. The advertising content Dc is data used for advertisements displayed on the display device 22 of the train 10. The advertising content Dc is updated approximately once a week, and its data volume is approximately 1 GB. The real-time nature of the advertising content Dc is moderate. Therefore, since the data volume of the advertising content Dc is large, the ground server 60 controls the advertising content Dc to be transmitted via WiMAX, and does not transmit the advertising content Dc if the communication limit for WiMAX is exceeded. If the ground server 60 did not transmit the advertising content Dc because the communication limit for WiMAX was exceeded, the ground server 60 controls the advertising content Dc to be transmitted the next day at the latest.

[0028] The second data is the train operation status record Dr transmitted from the on-board server 30 to the ground server 60. The train operation status record Dr is data indicating the operating status of the on-board device 23 described above, etc. The train operation status record Dr has a data capacity of approximately 1.5 GB per day. The real-time nature of the train operation status record Dr is lower than that of the advertising content Dc. Therefore, since the data capacity of the train operation status record Dr is large, the on-board server 30 controls the train operation status record Dr to be transmitted via WiMAX, and stops transmission of the train operation status record Dr before the communication limit for WiMAX is exceeded. The on-board server 30 may stop transmission of the train operation status record Dr for several days, and is therefore provided with a storage unit (not shown) that can store the train operation status record Dr for several days for which transmission will be stopped. In addition, if the transmission and reception periods of the advertising content Dc and the train operation status record Dr overlap, the on-board server 30 prioritizes the transmission and reception of the advertising content Dc and reschedules the transmission and reception of the train operation status record Dr.

[0029] The third data is the cab screen information Di transmitted from the on-board server 30 to the ground server 60. The cab screen information Di is data displayed on the display device 22 installed in the cab of the train 10. The data capacity of the cab screen information Di for one day is approximately 120 MB. The real-time nature of the cab screen information Di is higher than that of the advertising content Dc. That is, the real-time nature of each piece of data is, in descending order, the cab screen information Di, the advertising content Dc, and the train-formation vehicle operating status record Dr. The real-time nature of the cab screen information Di is the highest of the three pieces of data. Therefore, since the data capacity of the cab screen information Di is smaller than that of the other two pieces of data, if the on-board server 30 is connected to either a WiMAX or LTE communication network, it controls to transmit the cab screen information Di using the connected communication network. When at least one of the first connection rate of WiMAX and the second connection rate of LTE is equal to or greater than a specified threshold, the on-board server 30 may control the transmission of the cab screen information Di using a wireless communication method equal to or greater than the specified threshold.

[0030] As described above, the data transmitted and received between the on-board server 30 and the ground server 60 varies in data volume and real-timeness depending on the type of data. Therefore, the ground server 60 transmits advertising content Dc to the on-board server 30, for example, between stations where the first connection rate of WiMAX, the first communication network, is 80% or higher. The on-board server 30 also transmits the train-formation vehicle operation status record Dr to the ground server 60, for example, between stations where the first connection rate of WiMAX, the first communication network, is 80% or higher. The on-board server 30 transmits the cab screen information Di in a traveling section other than a traveling section where both WiMAX and LTE are out of range because the cab screen information Di requires high real-time performance, i.e., periodic transmission. As described above, WiMAX has a communication limit of 10 GB accumulated over three days. Therefore, the on-board server 30 stops transmitting the train-formation vehicle operation status record Dr when, for example, the first accumulated communication volume over three days reaches 8 GB. The on-board server 30 is configured to store the train operation status record Dr for a period of three days or more.

[0031] In the first embodiment, the on-board control unit 33 of the on-board server 30 creates a transmission / reception schedule based on the area map, the communication limit amount, and the data characteristics. The on-board control unit 33 transmits the created transmission / reception schedule to the ground server 60 via the first communication network, WiMAX, or the second communication network, LTE. Specifically, the on-board control unit 33 of the on-board server 30 transmits the transmission / reception schedule to the ground server 60 via the wireless communication device 41 and the WiMAX base station 51 or the LTE base station 52. The ground server 60 modifies or approves the transmission / reception schedule transmitted from the on-board control unit 33, and transmits the modified transmission / reception schedule or a notification of approval to the on-board control unit 33 of the on-board server 30 via the first communication network, WiMAX, or the second communication network, LTE. Specifically, the ground server 60 transmits the revised transmission / reception schedule or a notification of approval to the on-board control unit 33 of the on-board server 30 via the WiMAX base station 51 or the LTE base station 52 and the wireless communication device 41. The on-board control unit 33 controls the transmission and reception of data via WiMAX, which is the first communication network, and LTE, which is the second communication network, in accordance with the transmission and reception schedule revised or approved by the ground server 60.

[0032] The on-board control unit 33 may create a transmission / reception schedule for the advertising content Dc, the train-formation vehicle operation status record Dr, and the cab screen information Di based on a comparison result with a data capacity threshold for controlling data transmission / reception based on data capacity. For example, the on-board control unit 33 creates a transmission / reception schedule so that first data, whose data capacity included in the data characteristics is equal to or greater than the data capacity threshold, is transmitted / received via a first communication network, WiMAX, in a divided running section where a first connection rate is equal to or greater than the first data threshold, and second data, whose data capacity is less than the data capacity threshold, is transmitted / received via a first communication network, WiMAX, in a divided running section where a first connection rate is equal to or greater than a second data threshold, or is transmitted / received via a second communication network, LTE, in a divided running section where a second connection rate is equal to or greater than the second data threshold. For example, if the data capacity threshold is 500 MB, the advertising content Dc and the train-formation vehicle operation status record Dr are the first data, and the cab screen information Di is the second data. Furthermore, the first data threshold is set to 80%, and the second data threshold is set to 50%.

[0033] As a result, the ground server 60 calculates the first connection rate W between station A and station B. ＡＢ is 80% or more, the advertising content Dc can be transmitted between stations A and B via WiMAX, which is the first communication network. The on-board server 30 can receive the advertising content Dc between stations A and B via WiMAX, which is the first communication network.

[0034] The on-board server 30 also calculates the first connection rate W between station A and station B. ＡＢ is 80% or more, the train-form vehicle operation status record Dr can be transmitted between station A and station B via WiMAX, which is the first communication network. The ground server 60 can receive the train-form vehicle operation status record Dr between station A and station B via WiMAX, which is the first communication network.

[0035] The on-board server 30 also calculates the first connection rate W between station A and station B. ＡＢis 50% or more, the cab screen information Di can be transmitted between station A and station B via WiMAX, which is the first communication network. The ground server 60 can receive the cab screen information Di between station A and station B via WiMAX, which is the first communication network. Note that the on-board server 30 can receive the cab screen information Di between station A and station B via WiMAX, which is the first communication network. ＡＢ , the second connection rate L between station B and station C ＢＣ , and the second connection rate L between stations C and D ＣＤ If the ratio is 50% or more, the cab screen information Di can be transmitted between stations A and D via the second communication network, LTE. The ground server 60 can also receive the cab screen information Di between stations A and D via the second communication network, LTE.

[0036] FIG. 3 is a diagram showing an example of data transmission and reception by the on-board server 30 according to the first embodiment. The on-board server 30 can receive advertising content Dc and transmit train-formation operating status records Dr between stations A and B. The on-board server 30 can also transmit cab screen information Di between stations B and C. The transmission and reception pattern shown in FIG. 3 is an example and is not limited to this. The on-board server 30 can also transmit cab screen information Di between stations A and B, and between stations C and D.

[0037] The on-board control unit 33 may set the data capacity threshold, first data threshold, and second data threshold to variable values. The on-board control unit 33 may change the data capacity threshold, first data threshold, and second data threshold as appropriate, for example, depending on the data capacity of transmitted and received data, the actual first connection rate, and the second connection rate, etc. The on-board control unit 33 may change the data capacity threshold, first data threshold, and second data threshold as appropriate, depending on the type of train 10 (such as a local train or an express train), the speed of the train 10, etc. The on-board control unit 33 may treat the data capacity threshold, first data threshold, and second data threshold as predetermined fixed values ​​when there is no change in the communication status of wireless communication via WiMAX and LTE in the section in which the train 10 is traveling.

[0038] The on-board control unit 33 also calculates a first remaining capacity, which is the difference between the first communication volume and the first accumulated communication volume, and a second remaining capacity, which is the difference between the second communication volume and the second accumulated communication volume, and creates a transmission / reception schedule to transmit and receive the first data, i.e., the advertising content Dc and the train-formation vehicle operation status record Dr, based on the first remaining capacity and the second remaining capacity. As described above, the first communication network, WiMAX, is set with a communication limit of 10 GB accumulated over three days, and the second communication network, LTE, is set with a communication limit of 7 GB accumulated over one month. Therefore, the on-board control unit 33 creates a transmission / reception schedule to transmit and receive data within the range of the first remaining capacity and the second remaining capacity, taking into account the first remaining capacity and the second remaining capacity corresponding to each communication limit.

[0039] 4 is a flowchart showing the operation of the on-board server 30 according to the first embodiment. In the on-board server 30, the first on-board communication management unit 31 measures a first cumulative communication volume (step S101). The second on-board communication management unit 32 measures a second cumulative communication volume (step S102). The on-board control unit 33 calculates a first connection rate and a second connection rate (step S103). The on-board control unit 33 creates an area map showing the first connection rate and the second connection rate for each divided travel section (step S104). The on-board control unit 33 transmits the created area map to the ground server 60 via the wireless communication device 41 and the WiMAX base station 51 or the LTE base station 52 (step S105).

[0040] The on-board control unit 33 creates a transmission / reception schedule based on the area map, the communication limit amount, and the data characteristics (step S106). The on-board control unit 33 transmits the created transmission / reception schedule to the ground server 60 via the wireless communication device 41 and the WiMAX base station 51 or the LTE base station 52 (step S107). The on-board control unit 33 receives from the ground server 60 a transmission / reception schedule modified by the ground server 60 or a notification of approval by the ground server 60 via the WiMAX base station 51 or the LTE base station 52 and the wireless communication device 41 (step S108). The on-board control unit 33 controls data transmission / reception via the first communication network WiMAX and the second communication network LTE in accordance with the transmission / reception schedule modified or approved by the ground server 60 (step S109).

[0041] Next, the equipment installed on the ground will be described. The WiMAX base station 51 performs wireless communication using WiMAX with the wireless communication device 41 of the train 10. The LTE base station 52 performs wireless communication using LTE with the wireless communication device 41 of the train 10.

[0042] The ground server 60 controls the transmission and reception of data to and from the on-board server 30 mounted on the moving body, the train 10. As shown in Fig. 1 , the ground server 60 includes a first ground communication management unit 61, a second ground communication management unit 62, and a ground control unit 63.

[0043] The first terrestrial communication management unit 61 manages the transmission and reception of data via wireless communication using WiMAX, which is the first communication network. Specifically, the first terrestrial communication management unit 61 transmits and receives data via WiMAX via the WiMAX base station 51.

[0044] The second terrestrial communication management unit 62 manages the transmission and reception of data via wireless communication using LTE, which is the second communication network. Specifically, the second terrestrial communication management unit 62 transmits and receives data via LTE via the LTE base station 52.

[0045] The ground control unit 63 controls data transmission and reception via WiMAX, which is the first communication network, and LTE, which is the second communication network, in accordance with a transmission and reception schedule created based on the area map, the communication limit amount, and the data characteristics. In the first embodiment, the ground control unit 63 receives the transmission and reception schedule created by the on-board control unit 33 of the on-board server 30 based on the area map, the communication limit amount, and the data characteristics from the on-board server 30 via the first communication network or the second communication network. Specifically, the ground control unit 63 of the ground server 60 receives the transmission and reception schedule from the on-board control unit 33 of the on-board server 30 via the wireless communication device 41 and the WiMAX base station 51 or the LTE base station 52. The ground control unit 63 modifies or approves the received transmission and reception schedule, and transmits the modified transmission and reception schedule or a notification of approval to the on-board control unit 33 of the on-board server 30 via the WiMAX base station 51 or the LTE base station 52 and the wireless communication device 41. The ground control unit 63 controls the transmission and reception of data via the first communication network and the second communication network in accordance with the modified or approved transmission and reception schedule.

[0046] 5 is a flowchart showing the operation of the ground server 60 according to the first embodiment. In the ground server 60, the ground control unit 63 receives an area map from the on-board server 30 via the wireless communication device 41 and the WiMAX base station 51 or the LTE base station 52 (step S201). The ground control unit 63 also receives a transmission / reception schedule from the on-board server 30 via the wireless communication device 41 and the WiMAX base station 51 or the LTE base station 52 (step S202). The ground control unit 63 modifies or approves the received transmission / reception schedule (step S203). The ground control unit 63 transmits the modified transmission / reception schedule or a notification of approval to the on-board control unit 33 of the on-board server 30 via the WiMAX base station 51 or the LTE base station 52 and the wireless communication device 41 (step S204). The ground control unit 63 controls data transmission / reception via the first communication network and the second communication network in accordance with the modified or approved transmission / reception schedule (step S205).

[0047] Although the on-board control unit 33 of the on-board server 30 and the ground control unit 63 of the ground server 60 use the first connection rate of WiMAX, which is the first communication network, and the second connection rate of LTE, which is the second communication network, as parameters of the communication state, other parameters may also be used. For example, in the area map shown in FIG. 2 or 3, the WiMAX communication area is not uniform between stations A and B, and the LTE communication area is not uniform between stations C and D. Therefore, the on-board control unit 33 of the on-board server 30 and the ground control unit 63 of the ground server 60 may further use parameters such as the reception strength of each wireless communication system and transmit and receive data when the reception strength is equal to or greater than a specified threshold between stations where transmission and reception is possible according to the transmission and reception schedule. Regarding the reception strength, the reception strength used when data was transmitted and received in the past may be used instead of the current reception strength. As a result, when transmitting and receiving data between stations A and B using WiMAX, which is the first communication network, the on-board control unit 33 of the on-board server 30 and the ground control unit 63 of the ground server 60 can transmit and receive data in a WiMAX communication area between stations A and B that is closer to station B. Similarly, when transmitting and receiving data between stations C and D using LTE, which is the second communication network, the on-board control unit 33 of the on-board server 30 and the ground control unit 63 of the ground server 60 can transmit and receive data in an LTE communication area between stations C and D that is closer to station C. The on-board control unit 33 of the on-board server 30 and the ground control unit 63 of the ground server 60 may use a parameter other than reception strength as the other parameter, or may use two or more parameters as the other parameter.

[0048] Next, we will explain the hardware configuration of the on-board server 30. In the on-board server 30, the first on-board communication management unit 31, the second on-board communication management unit 32, and the on-board control unit 33 are realized by processing circuits. The processing circuits may be a processor and memory that executes programs stored in memory, or may be dedicated hardware.

[0049] FIG. 6 is a diagram showing an example in which the processing circuit 90 included in the on-board server 30 according to the first embodiment is configured with a processor 91 and a memory 92. When the processing circuit 90 is configured with the processor 91 and the memory 92, each function of the processing circuit 90 of the on-board server 30 is realized by software, firmware, or a combination of software and firmware. The software or firmware is written as a program and stored in the memory 92. The processing circuit 90 realizes each function by having the processor 91 read and execute the program stored in the memory 92. That is, the processing circuit 90 includes the memory 92 for storing the program that results in the processing of the on-board server 30 being executed. It can also be said that these programs cause a computer to execute the procedures and methods of the on-board server 30.

[0050] The program includes a first on-board communication management step in which a first on-board communication management unit 31 determines whether or not it is possible to connect to a first communication network in which a communication limit amount allowing communication up to a first communication amount in a first communication period is set, and measures a first cumulative communication amount in the first communication period by the first communication network; a second on-board communication management step in which a second on-board communication management unit 32 determines whether or not it is possible to connect to a second communication network in which a communication limit amount allowing communication up to a second communication amount in a second communication period is set, and measures a second cumulative communication amount in the second communication period by the second communication network; and an on-board control unit 33 controls the on-board communication management unit 31 to determine whether or not it is possible to connect to a second communication network in which a communication limit amount allowing communication up to a second communication amount is set, and measures a second cumulative communication amount in the second communication period by the second communication network. It can also be said that this is a program that causes the on-board server 30 to execute the following steps: based on the determination results of the management unit 32, calculate a first connection rate indicating the proportion of running sections into which communication via the first communication network is possible, and a second connection rate indicating the proportion of running sections into which communication via the second communication network is possible, for each divided running section into which the running section of the train 10, which is a moving body, is divided; create an area map indicating the first connection rate and the second connection rate for each divided running section; and control the transmission and reception of data via the first communication network and the second communication network in accordance with a transmission and reception schedule created based on the area map, the communication limit amount, and the data characteristics of the data.

[0051] Here, the processor 91 may be a CPU (Central Processing Unit), a processing device, an arithmetic device, a microprocessor, a microcomputer, or a DSP (Digital Signal Processor), etc. The memory 92 may be, for example, a non-volatile or volatile semiconductor memory such as a RAM (Random Access Memory), a ROM (Read Only Memory), a flash memory, an EPROM (Erasable Programmable ROM), or an EEPROM (Electrically EPROM), a magnetic disk, a flexible disk, an optical disk, a compact disk, a minidisk, or a DVD (Digital Versatile Disc).

[0052] 7 is a diagram showing an example in which the processing circuitry 93 included in the on-board server 30 according to the first embodiment is configured with dedicated hardware. When the processing circuitry 93 is configured with dedicated hardware, the processing circuitry 93 shown in FIG. 7 corresponds to, 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. Each function of the on-board server 30 may be realized by the processing circuitry 93 individually, or all functions may be realized collectively by the processing circuitry 93.

[0053] It should be noted that some of the functions of the on-board server 30 may be implemented by dedicated hardware and some by software or firmware. In this way, the processing circuit can implement each of the above-described functions by dedicated hardware, software, firmware, or a combination of these.

[0054] The hardware configuration of the on-board server 30 has been described above, but the hardware configuration of the ground server 60 is also similar. In the ground server 60, the first ground communication management unit 61, the second ground communication management unit 62, and the ground control unit 63 are realized by processing circuits. The processing circuits may be a processor and memory that executes programs stored in memory, or may be dedicated hardware.

[0055] As described above, according to this embodiment, the on-board server 30 creates an area map based on the first connection rate of wireless communication via WiMAX, which is the first communication network, and the second connection rate of wireless communication via LTE, which is the second communication network, creates a transmission and reception schedule taking into consideration the area map, the communication limit amounts of WiMAX, which is the first communication network, and LTE, which is the second communication network, and the characteristics of data to be transmitted and received, and transmits and receives data between the on-board server 30 and the ground server 60 in accordance with the transmission and reception schedule. The ground server 60 transmits and receives data between the on-board server 30 and the ground server 60 in accordance with the transmission and reception schedule created by the on-board server 30 and modified or approved by the ground server 60. This allows the on-board server 30 and the ground server 60 to control the transmission and reception of data so that the communication volumes of the two wireless communication methods, which have communication volume limits during a specified communication period, do not exceed the communication limit amounts.

[0056] Furthermore, the on-board server 30 and the ground server 60 can transmit and receive data without loss and with minimal delay while maintaining real-time performance according to the data type. Furthermore, by utilizing the services of a public communication carrier that allows contracts for two wireless communication methods, in this case WiMAX and LTE, on a single line, the on-board server 30 and the ground server 60 can simultaneously accommodate the increase in the amount of data transmitted and received via ground-to-vehicle communication between the on-board server 30 and the ground server 60 and improve cost performance.

[0057] Although WiMAX and LTE have been specifically described as examples of two wireless communication methods used between the on-board server 30 and the ground server 60, the present invention is not limited to these. The wireless communication method used between the on-board server 30 and the ground server 60 may also be a wireless communication method such as a fifth-generation mobile communication system.

[0058] Embodiment 2 In the first embodiment, a case where the on-board control unit 33 of the on-board server 30 creates a transmission / reception schedule is described. In the second embodiment, a case where the ground control unit 63 of the ground server 60 creates a transmission / reception schedule is described.

[0059] In the second embodiment, the configuration of the wireless communication system 1 is the same as the configuration of the wireless communication system 1 of the first embodiment shown in Fig. 1. In addition, in the second embodiment, the devices mounted on the train 10 are also the same as the devices mounted on the train 10 of the first embodiment shown in Fig. 1.

[0060] In the second embodiment, the on-board control unit 33 of the on-board server 30 transmits information necessary for creating a transmission / reception schedule to the ground control unit 63 of the ground server 60 via the wireless communication device 41 and the WiMAX base station 51 or the LTE base station 52. The information necessary for creating a transmission / reception schedule includes, for example, the first connection rate, the second connection rate, the first cumulative communication volume, the second cumulative communication volume, the data capacity threshold, the first data threshold, the second data threshold, the first remaining capacity, the second remaining capacity, the communication limits set for the first communication network (WiMAX) and the second communication network (LTE), and data characteristics. Note that the on-board control unit 33 of the on-board server 30 does not need to transmit information held by the ground control unit 63 of the ground server 60. The ground control unit 63 of the ground server 60 creates a transmission / reception schedule in a manner similar to that of the on-board control unit 33 of the on-board server 30 in the first embodiment. The ground control unit 63 of the ground server 60 transmits the created transmission / reception schedule to the on-board control unit 33 of the on-board server 30 via the WiMAX base station 51 or the LTE base station 52 and the wireless communication device 41 .

[0061] The on-board control unit 33 of the on-board server 30, like the ground control unit 63 of the ground server 60 in the first embodiment, modifies or approves the received transmission and reception schedule, and transmits the modified transmission and reception schedule or a notification of approval to the ground control unit 63 of the ground server 60 via the wireless communication device 41 and the WiMAX base station 51 or the LTE base station 52. The ground control unit 63 of the ground server 60 controls the transmission and reception of data via WiMAX, which is the first communication network, and LTE, which is the second communication network, in accordance with the transmission and reception schedule modified or approved by the on-board server 30.

[0062] 2 and 3 show one running train 10, but it is also possible that multiple trains 10 are running between Station A and Station D. In this case, the ground control unit 63 of the ground server 60 will transmit and receive data to and from multiple trains 10. Therefore, in the second embodiment, the ground control unit 63 of the ground server 60 can create a transmission and reception schedule for each train 10, taking into account the transmission and reception of data with multiple trains 10.

[0063] FIG. 8 is a flowchart showing the operation of the on-board server 30 according to the second embodiment. The operations from step S101 to step S105 in FIG. 8 are the same as those from step S101 to step S105 in the flowchart of the first embodiment shown in FIG. 4. The on-board control unit 33 transmits information necessary for creating a transmission / reception schedule to the ground server 60 via the wireless communication device 41 and the WiMAX base station 51 or the LTE base station 52 (step S116). The on-board control unit 33 receives the transmission / reception schedule from the ground server 60 via the WiMAX base station 51 or the LTE base station 52 and the wireless communication device 41 (step S117). The on-board control unit 33 modifies or approves the received transmission / reception schedule (step S118). The on-board control unit 33 transmits the modified transmission / reception schedule or a notification of approval to the ground server 60 via the wireless communication device 41 and the WiMAX base station 51 or the LTE base station 52 (step S119). The on-board control unit 33 controls the transmission and reception of data via the first communication network and the second communication network in accordance with the modified or approved transmission and reception schedule (step S120).

[0064] 9 is a flowchart showing the operation of the ground server 60 according to the second embodiment. In the ground server 60, the ground control unit 63 receives an area map from the on-board server 30 via the wireless communication device 41 and the WiMAX base station 51 or the LTE base station 52 (step S201). The ground control unit 63 also receives information necessary for creating a transmission and reception schedule from the on-board server 30 via the wireless communication device 41 and the WiMAX base station 51 or the LTE base station 52 (step S212). The ground control unit 63 creates a transmission and reception schedule based on the area map, the communication limit amount, and the data characteristics (step S213). The ground control unit 63 transmits the created transmission and reception schedule to the on-board control unit 33 of the on-board server 30 via the WiMAX base station 51 or the LTE base station 52 and the wireless communication device 41 (step S214). The ground control unit 63 receives the transmission / reception schedule modified by the on-board control unit 33 of the on-board server 30 or a notification of approval by the on-board control unit 33 of the on-board server 30 from the on-board control unit 33 of the on-board server 30 via the wireless communication device 41 and the WiMAX base station 51 or the LTE base station 52 (step S215). The ground control unit 63 controls the transmission / reception of data via WiMAX, which is the first communication network, and LTE, which is the second communication network, in accordance with the transmission / reception schedule modified or approved by the on-board server 30 (step S216).

[0065] As described above, in the second embodiment, the on-board control unit 33 of the on-board server 30 receives the transmission and reception schedule created by the ground server 60 based on the area map, the communication limit amount, and the data characteristics from the ground server 60 via the first communication network or the second communication network. The on-board control unit 33 controls the transmission and reception of data via the first communication network and the second communication network in accordance with the transmission and reception schedule that has been modified or approved from the received transmission and reception schedule.

[0066] The ground control unit 63 of the ground server 60 creates a transmission / reception schedule based on the area map, the communication limit amount, and the data characteristics, and transmits the schedule to the on-board server 30 via the first communication network or the second communication network. The ground control unit 63 controls data transmission / reception via the first communication network and the second communication network in accordance with the transmission / reception schedule modified or approved by the on-board server 30. Specifically, the ground control unit 63 creates a transmission / reception schedule so that first data, whose data volume included in the data characteristics is equal to or greater than a data volume threshold, is transmitted / received via the first communication network in divided driving sections where a first connection rate is equal to or greater than the first data threshold, and second data, whose data volume is less than the data volume threshold, is transmitted / received via the first communication network in divided driving sections where a first connection rate is equal to or greater than a second data threshold, or is transmitted / received via the second communication network in divided driving sections where a second connection rate is equal to or greater than the second data threshold. The data volume threshold, the first data threshold, and the second data threshold are changeable values. In addition, the on-board control unit 33 of the on-board server 30 calculates a first remaining capacity, which is the difference between the first communication volume and the first accumulated communication volume, and a second remaining capacity, which is the difference between the second communication volume and the second accumulated communication volume, and the ground control unit 63 creates a transmission / reception schedule to transmit and receive the first data based on the first remaining capacity and the second remaining capacity.

[0067] As described above, according to this embodiment, the transmission and reception schedule is created by the ground server 60. Even in this case, the on-board server 30 and the ground server 60 can obtain the same effects as in the first embodiment.

[0068] The configurations shown in the above embodiments are merely examples, and may be combined with other known technologies, or different embodiments may be combined with each other. It is also possible to omit or modify parts of the configurations as long as they do not deviate from the gist of the invention.

[0069] 1 Wireless communication system, 10 Train, 11 Track, 21 Train information management device, 22 Display device, 23 On-board device, 30 On-board server, 31 First on-board communication management unit, 32 Second on-board communication management unit, 33 On-board control unit, 41 Wireless communication device, 51 WiMAX base station, 52 LTE base station, 60 Ground server, 61 First ground communication management unit, 62 Second ground communication management unit, 63 Ground control unit, 90, 93 Processing circuit, 91 Processor, 92 Memory.

Claims

1. An in-vehicle server mounted on a moving body for controlling the transmission and reception of data to and from a ground server, a first in-vehicle communication management unit that determines whether it is possible to connect to a first communication network in which a communication limit amount that allows communication up to a first communication amount is set in a first communication period, and measures a first cumulative communication amount in the first communication period by the first communication network; a second in-vehicle communication management unit that determines whether it is possible to connect to a second communication network in which a communication limit amount that allows communication up to a second communication amount is set in a second communication period, and measures a second cumulative communication amount in the second communication period by the second communication network; Based on the determination result of the first in-vehicle communication management unit and the determination result of the second in-vehicle communication management unit, a first connection rate indicating the ratio of the travel sections in which communication by the first communication network is possible for each divided travel section obtained by dividing the travel section of the moving body, and a second connection rate indicating the ratio of the travel sections in which communication by the second communication network is possible are calculated, an area map showing the first connection rate and the second connection rate in each divided travel section is created, and based on the area map, the communication limit amount, and the transmission / reception schedule created based on the data characteristics, an in-vehicle control unit that controls the transmission and reception of the data by the first communication network and the second communication network; An in-vehicle server characterized by comprising the above.

2. The in-vehicle control unit creates the transmission / reception schedule based on the area map, the communication limit amount, and the data characteristics, transmits it to the ground server via the first communication network or the second communication network, and controls the transmission and reception of the data by the first communication network and the second communication network according to the transmission / reception schedule corrected or approved by the ground server. The in-vehicle server according to claim 1, characterized by the above.

3. The on-vehicle control unit transmits and receives, via the first communication network, first data whose data volume included in the data characteristics is equal to or greater than a data volume threshold, in a divided travel section where the first connection rate is equal to or greater than a first data threshold whose value is specified, and transmits and receives, via the first communication network, second data whose data volume is less than the data volume threshold, in a divided travel section where the first connection rate is equal to or greater than a second data threshold whose value is specified, or transmits and receives, via the second communication network, the second data in a divided travel section where the second connection rate is equal to or greater than the second data threshold, to create the transmission / reception schedule. The on-vehicle server according to claim 2, characterized in that.

4. The data volume threshold, the first data threshold, and the second data threshold are values that can be changed. The on-vehicle server according to claim 3, characterized in that.

5. The on-vehicle control unit calculates a first remaining capacity that is a difference between the first communication volume and the first cumulative communication volume, and a second remaining capacity that is a difference between the second communication volume and the second cumulative communication volume, and creates the transmission / reception schedule so as to transmit and receive the first data based on the first remaining capacity and the second remaining capacity. The on-vehicle server according to claim 3, characterized in that.

6. The on-vehicle control unit receives, from the ground server via the first communication network or the second communication network, the transmission / reception schedule created by the ground server based on the area map, the communication limit amount, and the data characteristics, and controls the transmission and reception of the data by the first communication network and the second communication network according to the received transmission / reception schedule that has been corrected or approved. The on-vehicle server according to claim 1, characterized in that.

7. The on-vehicle control unit calculates the first connection rate and the second connection rate at a specified cycle. The on-vehicle server according to claim 1, characterized in that.

8. The moving body is a train, and the divided travel section is a travel section between adjacent stations where the train stops. The on-vehicle server according to claim 1, characterized in that.

9. The first communication period is shorter than the second communication period, the first communication volume is larger than the second communication volume, and a first communication area connectable to the first communication network is smaller than a second communication area connectable to the second communication network. The on-vehicle server according to claim 1, characterized in that.

10. The first communication network is Worldwide Interoperability for Microwave Access, and the second communication network is Long Term Evolution. The in-vehicle server according to any one of claims 1 to 9, characterized in that.

11. A ground server that controls the transmission and reception of data to and from an in-vehicle server mounted on a moving body, In the in-vehicle server, it is determined whether it is possible to connect to a first communication network in which a communication limit amount enabling communication up to a first communication amount is set during a first communication period, and the first cumulative communication amount during the first communication period by the first communication network is measured. It is determined whether it is possible to connect to a second communication network in which a communication limit amount enabling communication up to a second communication amount is set during a second communication period, and the second cumulative communication amount during the second communication period by the second communication network is measured. Based on the two determination results, a first connection rate indicating the ratio of the driving sections in which communication by the first communication network is possible and a second connection rate indicating the ratio of the driving sections in which communication by the second communication network is possible for each divided driving section obtained by dividing the driving section of the moving body are calculated, and an area map indicating the first connection rate and the second connection rate in each divided driving section is created. A first ground communication management unit that manages the transmission and reception of the data by wireless communication using the first communication network, A second ground communication management unit that manages the transmission and reception of the data by wireless communication using the second communication network, A ground control unit that controls the transmission and reception of the data by the first communication network and the second communication network according to a transmission / reception schedule created based on the area map, the communication limit amount, and the data characteristics of the data. A ground server characterized by comprising.

12. The ground control unit receives the transmission / reception schedule created by the in-vehicle server from the in-vehicle server via the first communication network or the second communication network based on the area map, the communication limit amount, and the data characteristics of the data, and according to the received transmission / reception schedule that has been corrected or approved, controls the transmission and reception of the data by the first communication network and the second communication network. The ground server according to claim 11, characterized in that.

13. The ground control unit creates the transmission / reception schedule based on the area map, the communication limit amount, and the data characteristics of the data, transmits it to the in-vehicle server via the first communication network or the second communication network, and controls the transmission / reception of the data by the first communication network and the second communication network according to the transmission / reception schedule modified or approved by the in-vehicle server. The ground server according to claim 11, characterized in that.

14. The ground control unit transmits and receives first data whose data capacity included in the data characteristics is equal to or greater than a data capacity threshold value in the first communication network in a divided travel section where the first connection rate is equal to or greater than a first data threshold value defined, and transmits and receives second data whose data capacity is less than the data capacity threshold value in the first communication network in a divided travel section where the first connection rate is equal to or greater than a second data threshold value defined, or transmits and receives in the second communication network in a divided travel section where the second connection rate is equal to or greater than the second data threshold value defined, and creates the transmission / reception schedule. The ground server according to claim 13, characterized in that.

15. The data capacity threshold value, the first data threshold value, and the second data threshold value are changeable values. The ground server according to claim 14, characterized in that.

16. In the in-vehicle server, a first remaining capacity that is a difference between the first communication amount and the first cumulative communication amount, and a second remaining capacity that is a difference between the second communication amount and the second cumulative communication amount are calculated. The ground control unit creates the transmission / reception schedule so as to transmit and receive the first data based on the first remaining capacity and the second remaining capacity. The ground server according to claim 14, characterized in that.

17. The first communication period is shorter than the second communication period, the first communication amount is larger than the second communication amount, and a first communication area connectable to the first communication network is smaller than a second communication area connectable to the second communication network. The ground server according to claim 11, characterized in that.

18. The first communication network is Worldwide interoperability for Microwave Access, and the second communication network is Long Term Evolution. The ground server according to any one of claims 11 to 17, characterized in that.

19. An in-vehicle server according to any one of claims 2 to 5 and a ground server according to claim 12, or an in-vehicle server according to claim 6 and a ground server according to any one of claims 13 to 16, characterized in that it is a wireless communication system.

20. An in-vehicle wireless communication method for controlling an in-vehicle server mounted on a moving body and performing data transmission and reception with a ground server, wherein a first in-vehicle communication management unit determines whether it is possible to connect to a first communication network in which a communication limit amount that allows communication up to a first communication amount in a first communication period is set, and measures a first cumulative communication amount in the first communication period by the first communication network; a first in-vehicle communication management step; a second in-vehicle communication management unit determines whether it is possible to connect to a second communication network in which a communication limit amount that allows communication up to a second communication amount in a second communication period is set, and measures a second cumulative communication amount in the second communication period by the second communication network; a second in-vehicle communication management step; an in-vehicle control unit calculates a first connection rate indicating a ratio of a travel section in which communication by the first communication network is possible and a second connection rate indicating a ratio of a travel section in which communication by the second communication network is possible for each divided travel section obtained by dividing the travel section of the moving body based on the determination result of the first in-vehicle communication management unit and the determination result of the second in-vehicle communication management unit, creates an area map showing the first connection rate and the second connection rate in each divided travel section, and controls transmission and reception of the data by the first communication network and the second communication network according to a transmission / reception schedule created based on the area map, the communication limit amount, and the data characteristics; an in-vehicle control step; characterized in that it includes the above.

21. In the in-vehicle control step, the in-vehicle control unit creates the transmission / reception schedule based on the area map, the communication limit amount, and the data characteristics, transmits it to the ground server via the first communication network or the second communication network, and controls transmission and reception of the data by the first communication network and the second communication network according to the transmission / reception schedule corrected or approved by the ground server. The in-vehicle wireless communication method according to claim 20, characterized in that it is as described above.

22. In the on-vehicle control step, the on-vehicle control unit receives, via the first communication network or the second communication network, the transmission / reception schedule created by the ground server based on the area map, the communication limit amount, and the data characteristics, and controls the transmission and reception of the data by the first communication network and the second communication network according to the transmission / reception schedule obtained by modifying or approving the received transmission / reception schedule. The on-vehicle wireless communication method control method according to claim 20, characterized by the above.

23. A ground wireless communication method control method for a ground server that controls the transmission and reception of data to and from an on-vehicle server mounted on a moving body, In the on-vehicle server, it is determined whether it is possible to connect to a first communication network in which a communication limit amount that allows communication up to a first communication amount in a first communication period is set, the first cumulative communication amount in the first communication period by the first communication network is measured, it is determined whether it is possible to connect to a second communication network in which a communication limit amount that allows communication up to a second communication amount in a second communication period is set, the second cumulative communication amount in the second communication period by the second communication network is measured, and based on the two determination results, a first connection rate indicating the ratio of the travel section in which communication by the first communication network is possible and a second connection rate indicating the ratio of the travel section in which communication by the second communication network is possible are calculated for each divided travel section obtained by dividing the travel section of the moving body, and an area map indicating the first connection rate and the second connection rate in each divided travel section is created. A first ground communication management unit performs a first ground communication management step of managing the transmission and reception of the data of the wireless communication by the first communication network. A second ground communication management unit performs a second ground communication management step of managing the transmission and reception of the data of the wireless communication by the second communication network. A ground control unit controls the transmission and reception of the data by the first communication network and the second communication network according to a transmission / reception schedule created based on the area map, the communication limit amount, and the data characteristics of the data. The ground wireless communication method control method is characterized by including the above.

24. In the ground control step, the ground control unit receives the transmission / reception schedule created by the on-vehicle server from the on-vehicle server via the first communication network or the second communication network based on the area map, the communication limit amount, and the data characteristics of the data, and controls the transmission and reception of the data by the first communication network and the second communication network according to the transmission / reception schedule obtained by correcting or approving the received transmission / reception schedule. The ground wireless communication method control method according to claim 23, characterized in that.

25. In the ground control step, the ground control unit creates the transmission / reception schedule based on the area map, the communication limit amount, and the data characteristics of the data, transmits it to the on-vehicle server via the first communication network or the second communication network, and controls the transmission and reception of the data by the first communication network and the second communication network according to the transmission / reception schedule corrected or approved by the on-vehicle server. The ground wireless communication method control method according to claim 23, characterized in that.