JP2010113505A - Content synchronization system, ground cooperation server device, and cooperation server device on moving object - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a content synchronization system for transmitting/receiving data according to the priority of data or the kind of information without transmitting/receiving updated or redundant data. <P>SOLUTION: The content synchronization system is configured to share information between a system 2 on a moving object and a ground system 1. The ground system 1 is provided with a ground service application 11, a ground cooperation server 10, a radio base station 12 and a communication network 13. The system 2 on the moving object is provided with a service application 21 on the moving object, a cooperation server 20 on the moving object, and radio communication equipment 22. The ground cooperation server 10 and the cooperation server 20 on the moving object are configured to transmit/receive the information of the ground system 1 and the system 2 on the moving object for synchronizing information according to the request of the ground service application 11 and the service application 21 on the moving object, or at a predetermined cycle. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention provides content sharing information between a mobile system provided on a mobile body such as a train for information processing and a ground system connected to the mobile system via a communication network. It relates to a synchronization system.

  In recent years, devices using SNMP (Simple Network Management Protocol), which is a protocol for monitoring and controlling computers and network devices connected to a network, are increasing. In these apparatuses, a system is known in which an SNMP manager acquires information on an SNMP agent and synchronizes the information using SNMP. For example, the following patent document 1 discloses a technique related to the above-described content. In the network management system described in Patent Document 1, each SNMP agent has a table in which an update flag of information to be managed is registered, and the SNMP manager stores information on each agent based on the update flag. Request transmission.

  Patent Document 2 below discloses a train information transmission system as a railway system. In this train information transmission system, on-board information such as the train number and running position of the own train detected by the control device of the on-board system in operation, schedule change information such as train arrival / departure line changes and temporary trains, and slow trains Transmits ground information such as information by train radio.

JP 2007-241518 A JP 2004-189043 A

  In the network management system described in Patent Document 1, since an updated MIB object is acquired between the SNMP manager and the SNMP agent, the time required to synchronize the SNMP agent information is shortened. be able to.

  However, in this network management system, there is a problem that information necessary for the higher level application of the SNMP manager and the SNMP agent cannot be acquired preferentially.

  Moreover, in the train information transmission system described in Patent Document 2, every time transmission is requested from each computer of the central management center, information is transmitted and received using train radio. There has been a problem that information may be transmitted and received in duplicate.

  Therefore, the present invention has been made to solve such a problem, and can transmit and receive data according to the priority and information type of data without performing transmission and reception of unupdated data and duplicate data. The purpose is to obtain a content synchronization system.

  A content synchronization system according to the present invention includes a mobile system provided on a mobile body for information processing, and a ground system connected to the mobile system via a communication network and provided on the ground for information processing. Content synchronization system that shares information with each other. The ground system includes a ground service application for managing information to be provided to the mobile system, information on the ground system and the mobile system, and the ground system between the ground system and the mobile system. A ground base server that synchronizes information, a wireless base station that transmits and receives information on the ground system and the mobile system between the mobile system, the ground service application, the ground cooperative server, and the wireless A communication network connecting the base station. The mobile system includes a mobile service application that manages information for providing the function of the mobile system, information on the mobile system and the ground system, and the mobile system and the ground system. A mobile cooperation server that synchronizes the information with the system, and a wireless communication device that transmits and receives information on the ground system and the mobile system to and from the ground system. The ground cooperation server and the on-mobile cooperation server transmit / receive information on the ground system and the on-mobile system to each other in response to a request from the ground service application and the mobile service application or at a predetermined cycle. Synchronize the information.

  According to the content synchronization system of the present invention, by periodically exchanging an update data identifier and an asynchronous data identifier between linked servers, data can be transmitted and received only when updated information exists, or the linked server determines It is possible to request acquisition of data in accordance with the priority and the information type at the timing to be performed. Therefore, high priority data can be transmitted / received at a necessary timing, or only updated data can be transmitted / received.

  The content synchronization system of the present invention can provide a service as a content synchronization system between a ground system and a mobile system, or can provide a service as a content synchronization system between mobile systems. In the present embodiment, a case where a service is provided as a content synchronization system between a ground system and a mobile system will be mainly described. Here, a content synchronization system between the ground system and the on-board system will be described by taking a railway system as an example.

<Embodiment 1>
FIG. 1 is a block diagram schematically showing the configuration of a content synchronization system according to Embodiment 1 of the present invention. In the drawings to be described later, the same reference numerals denote the same or corresponding parts.

  In FIG. 1, the ground system 1 includes a ground cooperation server 10, a ground service application 11, a radio base station 12, and a communication network 13. The ground cooperation server 10, the ground service application 11, and the wireless base station 12 are connected via a communication network 13. There may be one or more ground service applications 11 and wireless base stations 12 in the ground system 1.

  In FIG. 1, the on-board system 2 includes an on-board cooperation server 20, an on-board service application 21, and a wireless communication device 22. The on-board service application 21 is connected to the wireless communication device 22 via the on-board cooperation server 20. The on-board service application 21 and the wireless communication device 22 of the on-board system 2 may be one or plural. In the content synchronization system according to the present invention, there is one ground system 1 but a plurality of on-vehicle systems 2 exist.

  Next, each configuration of the ground system 1 will be described. The ground cooperation server 10 synchronizes the ground information, the update data identifier, and the asynchronous data identifier set from the ground service application 11 with the on-board cooperation server, or the on-board information, update data identifier, And asynchronous data identifiers.

  The ground cooperation server 10 also updates the ground data and the on-board information with the information body part (hereinafter referred to as data) as an update data identifier (hereinafter referred to as the update data identifier of the ground cooperation server as the ground update unit, the vehicle Asynchronous data identifier indicating whether or not the information unit is synchronized although the synchronization of the update data identifier of the upper cooperative server and the update data identifier has been completed (hereinafter referred to as the asynchronous data identifier of the ground cooperative server) The asynchronous data identifier of the on-board cooperation server is managed separately on the on-board Async section).

  The ground cooperation server 10 provides a function for accessing the on-board information to the ground service application 11 or notifies when the on-board information registered for the update notification from the ground service application 11 is updated. To do.

  Further, the terrestrial cooperation server 10 manages a plurality of radio base stations 12 that transmit using different communication media, selects the radio base station 12 that transmits in consideration of the state of the communication media, and transmits and receives by the radio base station 12. Generate possible data formats and send and receive synchronized data.

  Here, the ground information includes a diagram indicating a travel route, a route opening prediction, a surrounding train position, and operation information. The on-board information includes the train number, position, speed, travel prediction, crew information, and failure information.

  The ground service application 11 uses the information acquired from the on-board system 2 by the ground cooperation server 10 to generate a diagram to be transmitted to the on-board system 2, road opening prediction information, and the like, and sets the information on the ground cooperation server 10 To do.

  The wireless base station 12 transmits data requested to be transmitted from the ground cooperation server 10 to the wireless communication device 22 or receives data requested to be transmitted from the on-vehicle cooperation server 20 from the wireless communication device 22. The radio base station 12 supports communication in a specific area using one communication medium. When there are a plurality of radio base stations, the communication media supported by each radio base station may be different or the same. good. The communication medium here may be a protocol adopted in a wireless LAN, a cellular phone, or the like, or may be a protocol adopted in an existing train radio.

  The communication network 13 connects the ground cooperation server 10, the ground service application 11, and the radio base station 12, and may be an IP (Internet Protocol) network or a non-IP network.

  Next, each configuration of the on-board system 2 will be described. The on-vehicle cooperation server 20 basically has a function equivalent to that of the ground cooperation server 10. The on-board cooperation server 20 synchronizes the on-board information, the update data identifier, and the asynchronous data identifier set from the on-board service application 21 with the ground cooperation server, or the ground information, update data identifier, And asynchronous data identifiers. The on-board cooperation server 20 manages the ground information and the on-board information by dividing them into an information section, an update section, and an async section.

  The onboard cooperation server 20 provides the onboard service application 21 with a function of accessing the ground information or when the onboard service application 21 updates the ground information registered for the update notification. Or notify.

  Further, the on-board cooperation server 20 manages a plurality of wireless communication devices 22 that transmit using different communication media, and selects the wireless communication device 22 to be transmitted in consideration of the state of the communication media, and synchronizes data. Send and receive.

  The on-board service application 21 sets on-board information such as the position and speed of the train in the on-board linkage server 20 or uses the information received from the ground system 1 to determine an appropriate operation speed that the own train should set. To decide.

  The wireless communication device 22 transmits data requested to be transmitted from the on-board cooperation server 20 to the wireless base station 12 or receives data requested to be transmitted from the ground cooperation server 10 from the wireless base station 12. The wireless communication device 22 supports communication in a specific area with one communication medium. When there are a plurality of wireless communication devices 22 in one on-vehicle system 2, the communication media supported by each wireless communication device 22 Are different.

  Next, a detailed configuration of the ground system 1 will be described. FIG. 2 is a block diagram showing in detail the configuration of the ground system 1 in the content synchronization system according to Embodiment 1 of the present invention.

  First, the function of the ground cooperation server 10 will be described in more detail. The ground cooperation server 10 includes synchronous communication control means 101, ground service application access means 102, information storage means 103, communication protocol processing means 104, and communication media control means 105.

  FIG. 5 is a diagram showing a detailed configuration of the information storage unit 103. The information storage means 103 includes a ground master INDEX unit 103a, a ground master DATA 103b, an on-vehicle mirror INDEX unit 103c, and an on-vehicle mirror DATA 103d. The information storage means 103 is composed of the number of on-board cooperation servers 20 managed by the ground cooperation server 10.

  The ground master INDEX unit 103a includes a ground update unit 103e and an on-vehicle Sync unit 103f. When there is an information update request from the ground service application 11 in the ground information, the ground update unit 103 e stores the identifier of the information by the ground service application access unit 102. The on-board Async unit 103f stores an identifier of the on-board update unit 203g received from the on-board cooperation server 20 that has been synchronized with the on-board master DATA 203d.

  When the synchronization of the ground master INDEX unit 103a is completed, the ground update unit 103e whose synchronization is completed by the synchronous communication control means 101 is copied to the ground sync unit 103h, and the ground update unit 103e is deleted.

  Further, when receiving the ground Async unit 203h of the onboard master INDEX unit 203c from the onboard cooperation server, the synchronous communication control means 101 compares with the ground Async unit 103h, and the data identifier contained in the ground Async unit 203h indicates the ground Async unit 103h. Is included, the corresponding identifier is deleted from the ground Async unit 103h.

  When the synchronization between the on-board master DATA 203d and the on-board mirror DATA 103d is completed, the synchronization communication control unit 101 copies the identifier of the synchronized data from the on-board Update unit 103g to the on-board Async unit 103f, and the on-board Update unit. Deleted from 103g.

  When there is an information update request from the ground service application 11, the ground master DATA 103 b stores the information main body by the ground service application access means 102.

  The on-vehicle mirror INDEX unit 103c includes an on-vehicle Update unit 103g and a ground Async unit 103h. The on-board update unit 103g stores the identifier of the updated information in the on-board master DATA 203d of the on-board cooperation server 20, and accumulates the identifier every time the on-board update unit is received from the on-board cooperation server 20. The ground Sync unit 103h stores an identifier in which the synchronization between the ground master DATA 103b and the ground mirror DATA 203b is not completed in the ground Update unit 103e transmitted to the on-board cooperation server 20.

  The on-board mirror DATA 103d stores the information main body received from the on-board cooperation server 20 among the on-board information.

  Here, the information storage means 103 may be configured by MIB (Management Information Base). By configuring with the MIB, it becomes a tree-structured database, so that the data to be transmitted can be easily specified. Further, the ground Async unit 103h and the on-board Update unit 103g may be configured only by the identifier of the data that is not synchronized, or may be configured by the identifier of the data that is not synchronized and the number of synchronizations.

  The synchronous communication control means 101 manages the synchronization timing for the plurality of on-board systems 2 in order to synchronize the on-board cooperation server 20 with the ground information and the on-board information. When the synchronization timing comes, the ground update unit 103e indicating whether or not the ground master DATA 103b has been updated, and the on-board Async unit 103f indicating data that has been synchronized between the on-board mirror DATA 103d and the on-board master DATA 203d. The transmission request is passed to the communication protocol processing means 104, and the on-board system is requested to transmit data.

  Further, the synchronous communication control unit 101 manages the update cycle, the priority, and the final synchronization time for each information type in order to transmit the ground master DATA 103b to the on-board cooperation server 20. If synchronization is not performed for more than the time of the update cycle, when transmitting the ground master INDEX unit 103a, the ground master DATA 103b is transmitted to the on-board cooperation server 20 at the same time, or from the on-board mirror INDEX unit 103c. A request for transmission of the updated information body on the vehicle is made to the upper system 2.

  Further, when there is information to be notified to the ground service application 11, the synchronous communication control means 101 notifies the ground service application access means 102 of message reception.

  The ground service application access unit 102 provides an interface with the ground service application 11. For example, the information storage means 103 is accessed in response to a request from the ground service application 11, and the on-vehicle system 2 composition information and position information received from the synchronous communication control means 101 are used as a request for the ground service application 11. Notify regardless. For example, the interface provided to the ground service application 11 is an API (Application Program Interface) function.

  Here, an interface (API function) provided by the above-described ground service application access unit 102 to the ground service application 11 will be described. FIG. 4 is a diagram showing an example of the API function. When the API function passes an argument from the ground service application 11 to the ground service application access unit 102, the ground service application access unit 102 returns a return value to the ground service application 11. There is also an API function that returns a return value spontaneously from the ground service application access means 102 to the ground service application 11 even if the ground service application access means 102 is not passed an argument. Each API function will be described below with reference to FIG.

  First, composition notification (Accept) will be described. Accept indicates the knitting state when the ground service application access means 102 receives a change in the knitting state (new knitting / termination of the on-board system 2, merge with other knitting, division) from the synchronous communication control means 101. It is used to notify the ground service application 11 voluntarily.

  There is no Accept argument. On the other hand, the return value of Accept includes the vehicle ID and the composition state. The vehicle ID is an identifier for identifying the on-vehicle system. The knitting state is an identifier indicating a change in the knitting state of the on-vehicle system. For example, identifiers are assigned such as “0: new organization”, “1: end”, “2: merge”, “3: division”, and the like.

  Next, communication media connection status notification (LanConnect) will be described. LanConnect voluntarily notifies the ground service application 11 of the connection state of the communication medium when the ground service application access unit 102 receives a change (new connection, disconnection) of the communication medium from the synchronous communication control unit 101. Use to do.

  There is no argument for LanConnect. On the other hand, the return value of LanConnect includes a vehicle ID, a communication media ID, and a communication media connection state. Since the vehicle ID is the same as the above-described content, the description is omitted. The communication media ID is an identifier for identifying the communication media. The communication media connection status is an identifier indicating the connection status of the communication media. For example, an identifier is assigned such as “0: connect”, “1: disconnect”, and the like.

  Next, information setting (Set) will be described. Set is used by the ground service application 11 to set data in the information storage unit 103. The ground service application access means 102 stores the data identifier data designated as the argument in the information storage means 103, includes the stored result in the return value, and notifies the ground service application 11.

  Set arguments include a vehicle ID, a data identifier, data, a data size, and a forced transmission flag (optional). Since the vehicle ID is the same as the above-described content, the description is omitted. The data identifier is an identifier for identifying data. The data is a data body stored in the information storage means. The data size indicates the size of the data. The forced transmission flag is a flag for requesting that the data stored in the information storage unit 103 be immediately transmitted to the on-board system. This forced transmission flag is used as an option. For example, “0: invalid”, “1: valid” are assigned. On the other hand, the return value of Set includes a vehicle ID and an event code. Since the vehicle ID is the same as the above-described content, the description is omitted. The event code is an identifier indicating the result of setting data in the information storage means. For example, “0: success”, “1: designated data identifier does not exist”, and the like are assigned.

  Next, information acquisition (Get) will be described. Get is used by the ground service application 11 for the ground service application access means 102 to acquire data in the information storage means 103. The ground service application access means 102 acquires the data of the data identifier designated as the argument from the information storage means 103, stores the acquired data in the return value, and notifies the ground service application 11.

  The Get argument includes a vehicle ID and a data identifier. Since the vehicle ID and the data identifier are the same as those described above, the description thereof is omitted. On the other hand, the return value of Get includes a vehicle ID, a data identifier, data, a data size, and a synchronization state (option). Since the vehicle ID, data identifier, data, and data size are the same as those described above, description thereof is omitted. The synchronization state is a flag indicating whether or not the data stored in the information storage unit is the latest. For example, “0: latest data”, “1: old data”, etc. are assigned.

  Next, data update notification (Notify) will be described. Notify voluntarily notifies the ground service application 11 from the ground service application access means 102 when the data set by the data notification setting (SetListener) is updated.

  There is no Notify argument. On the other hand, the return value of Notify includes a vehicle ID, a data identifier, data, and a data size. Since the vehicle ID, data identifier, data, and data size are the same as those described above, description thereof is omitted.

  Next, the data update notification setting (SetListener) will be described. The SetListener sets data requesting data update notification to the ground service application access means 102 so that the ground service application 11 automatically receives data from the ground service application access means 102 when the data is updated. To do.

  The arguments of SetListener include a vehicle ID, a data identifier, and a valid / invalid flag. Since the vehicle ID and the data identifier are the same as those described above, the description thereof is omitted. The valid / invalid flag is a flag for validating or invalidating the data update notification. For example, “0: invalid”, “1: valid”, etc. are assigned. On the other hand, the return value of SetListener includes a vehicle ID and an event code. Since the vehicle ID is the same as the above-described content, the description is omitted. The event code is an identifier indicating the result of setting the data update notification. For example, “0: success”, “1: setting failure”, etc. are assigned.

  Finally, parameter setting (SetParameter) will be described. The SetParameter requests the ground service application access unit 102 to set communication parameters in order for the ground service application 11 to set the priority and update cycle at which the synchronization control unit synchronizes data.

  The argument of SetParameter includes a vehicle ID, a data identifier, an attribute, and an attribute parameter value. Since the vehicle ID and the data identifier are the same as those described above, the description thereof is omitted. The attribute is an identifier of a communication parameter to be set. For example, the attribute includes data priority, data update cycle, data type, and the like. The attribute parameter value is the value of the communication parameter to be set. On the other hand, the return value of SetParameter includes a vehicle ID and an event code. Since the vehicle ID is the same as the above-described content, the description is omitted. The event code is an identifier indicating the result of setting the communication parameter. For example, “0: success”, “1: setting failure”, etc. are assigned.

  Returning to FIG. 2, the remaining functions of the ground cooperation server 10 will be described. The communication protocol processing means 104 performs communication control for transmitting / receiving a message to / from the on-board cooperation server 20. For example, after giving header information such as a message type and a retransmission flag to the data passed from the synchronous communication control means 101, or converting the data into a message format that can be transmitted by the radio base station 12, the communication network 13 is used. The message to be transmitted to the radio base station 12 is passed. When a message is received from the radio base station 12, the received data is stored in the information storage unit, and then the type of the received message and the data identifier included in the received message are notified to the synchronous communication control unit 101.

  Furthermore, when transmitting a message to the radio base station 12, the communication protocol processing unit 104 can select and transmit an appropriate communication medium from information managed by the communication media control unit 105, or the communication protocol processing unit 104. Can also provide division / assembly control, retransmission control, and the like. For example, by applying SNMP to the communication protocol processing unit 104, it is possible to easily acquire data in the information storage unit 203 of the on-board cooperation server 20.

  Further, the communication protocol processing unit 104 periodically monitors information in the information storage unit 103 and transmits the updated information to the on-board system 2 when the information is updated.

  The communication media control unit 105 periodically manages the communication media supported by the radio base station 12 in order to select the communication media to be transmitted and the radio base station 12 in order to manage the communication quality. Send and receive control messages.

  Next, functions of the ground service application 11 will be described in detail. The ground service application 11 includes reception data processing means 111 and transmission data generation means 112.

  The reception data processing unit 111 displays or stores the data passed from the ground service application access unit 102. The transmission data generation means 112 generates information (for example, travel prediction information and operation information) to be transmitted to the on-board system 2 based on information (for example, position, speed information, etc.) received from the on-board system 2, Data to be transmitted is transferred to the ground service application access means 102.

  Next, functions of the radio base station 12 will be described in detail. The radio base station 12 includes a transmission unit 121, a reception unit 122, and a communication media management unit 123.

  The transmission unit 121 transmits information passed from the communication protocol processing unit 104 via the communication network 13 to the on-vehicle system 2 via the communication network 13. The receiving unit 122 receives information transmitted from the on-vehicle system 2 and passes it to the communication protocol processing unit 104 via the communication network 13. The communication media management means 123 is a period for managing communication media supported by the radio base station 12 and managing communication quality in order for the communication media control means 105 to manage the communication media management means 123. Thus, the control message is transmitted to and received from the communication media control means 105.

  Next, functions of the communication network 13 will be described in detail. The communication network 13 is a network that connects the ground cooperation server 10, the ground service application 11, and the wireless base station 12. The communication network 13 accesses one ground cooperation server 10 from a plurality of ground service applications 11, and a plurality of wireless base stations. It is used to send information from.

  Next, a detailed configuration of the on-board system 2 will be described. FIG. 3 is a block diagram showing in detail the configuration of the on-board system 2 in the content synchronization system according to Embodiment 1 of the present invention. The on-board system 2 has basically the same configuration as the ground system 1, but the on-board system 2 does not include the communication network 13.

  First, the function of the on-board cooperation server 20 will be described in more detail. The on-board cooperation server 20 includes synchronous communication control means 201, on-board service application access means 202, information storage means 203, communication protocol processing means 204, and communication media control means 205.

  FIG. 6 is a diagram showing a detailed configuration of the information storage unit 203. The information storage unit 203 includes a ground mirror INDEX unit 203a, a ground mirror DATA 203b, an on-vehicle master INDEX unit 203c, and an on-vehicle master DATA 203d.

  The ground mirror INDEX unit 203a includes a ground update unit 203e and an on-vehicle Async unit 203f. The ground update unit 203e stores the identifier of the updated information in the ground master DATA 103b of the ground cooperation server 10, and accumulates the information every time the ground update unit is received from the ground cooperation server 10. The on-board Async unit 203f stores an identifier in which the synchronization between the on-board master DATA 203d and the on-board mirror DATA 103d in the on-board Update unit 203g transmitted to the ground cooperation server 10 is not completed.

  The ground mirror DATA 203b stores the information body received from the ground cooperation server 10 among the ground information.

  The on-vehicle master INDEX unit 203c includes an on-board Update unit 203g and a ground Async unit 203h. When there is an information update request from the on-board service application 21 in the on-board information, the on-board update unit 203g stores the identifier of the information by the on-board service application access means 202. The ground Async unit 203h stores an identifier in which the synchronization of the ground mirror DATA 203b is completed in the ground update unit 203e received from the ground cooperation server 10.

  When the synchronization of the on-board master INDEX unit 203c is completed, the on-board Update unit 203g updated by the synchronous communication control unit 201 is copied to the on-board Async unit 203f, and the on-board Update unit 203g is deleted.

  When the on-board ASYNC unit 103f of the ground master INDEX unit 103c is received from the ground cooperation server, the synchronous communication control unit 201 compares the on-vehicle Async unit 103f with the data identifier included in the on-board Async unit 103f. It is deleted from the section 203f.

  When the synchronization between the ground master DATA 103b and the ground mirror DATA 203b is completed, the synchronous communication control unit 201 copies the identifier of the synchronized data to the ground Async unit 203h including the ground Update unit 203e and deletes it from the ground Update unit 203e. The

  Further, the on-vehicle Async unit 203f and the ground update unit 203e may be configured with only the identifier of the data that is not synchronized, or may be configured with the identifier of the data that is not synchronized and the number of synchronizations.

  The synchronous communication control unit 201 synchronizes the ground cooperation server 10 with the ground information and the on-board information. When the reception notification of the ground master INDEX unit 103a is received from the ground cooperation server 10, the on-board update unit 203g indicating whether the on-board master DATA 203d has been updated, the ground mirror DATA 203b, and the ground master DATA 103b are synchronized. The transmission request of the ground Async unit 203h indicating whether or not is sent to the communication protocol processing means 204, and the ground system 1 is requested to transmit data.

  Further, when receiving the on-board information transmission request notification from the ground cooperation server 10, the synchronous communication control unit 201 passes the on-board master DATA 203d to the communication protocol processing unit 204 to transmit to the ground system 1, Or requesting the ground system 1 to transmit the updated information body on the ground based on the ground update unit 203e.

  Further, when there is information to be notified to the on-board service application 21, the synchronous communication control unit 201 notifies the on-board service application access unit 202 of message reception.

  The on-vehicle service application access means 202 provides an interface with the on-vehicle service application 21. For example, the information storage unit 203 is accessed in response to a request from the on-board service application 21, and the schedule information or operation information of the ground system 1 received from the synchronous communication control unit 201 is requested by the on-board service application 21. Notify regardless. For example, the interface provided to the on-board service application 21 is an API function as shown in FIG. However, the on-board service application access means 202 does not provide a composition notification (Accept) among the APIs shown in FIG.

  The communication protocol processing unit 204 performs communication control for transmitting / receiving a message to / from the ground cooperation server 10. For example, after giving header information such as a message type and a retransmission flag to the data passed from the synchronous communication control unit 201 or converting the data to a message format that can be sent, the message to be transmitted to the wireless communication device 22 is passed. . When a message is received from the wireless communication device 22, the received data is stored in the information storage unit 203, and then the type of the received message and the data identifier included in the received message are notified to the synchronous communication control unit 201.

  Further, when transmitting a message to the wireless communication device 22, an appropriate communication medium can be selected and transmitted from information managed by the communication media control unit 205, and the communication protocol processing unit 204 can perform division / assembly control and retransmission. Control etc. can also be provided. For example, by applying SNMP to the communication protocol processing unit 204, it is possible to easily acquire the data in the information storage unit 103 of the ground cooperation server 10.

  Further, the communication protocol processing unit 204 periodically monitors information in the information storage unit 203, and transmits the updated information to the ground system 1 when the information is updated.

  The communication media control unit 205 periodically manages the communication media supported by the wireless communication device 22 in order to select the communication media to be transmitted and the wireless communication device 22 in order to manage the communication quality. Send and receive control messages.

  Next, functions of the on-vehicle service application 21 will be described in detail. The on-vehicle service application 21 includes reception data processing means 211 and transmission data generation means 212.

  The reception data processing unit 211 displays or stores data passed from the on-vehicle service application access unit 202. The transmission data generation unit 212 generates information (for example, position information, speed information, etc.) to be transmitted to the ground system 1 and passes the data to be transmitted to the on-vehicle service application access unit 202.

  Next, functions of the wireless communication device 22 will be described in detail. The wireless communication device 22 includes a transmission unit 221, a reception unit 222, and a communication media management unit 223.

  The transmission unit 221 transmits the information passed from the communication protocol processing unit 204 to the ground system 1. The receiving unit 222 receives the information transmitted from the ground system 1 and passes it to the communication protocol processing unit 204. The communication media management means 223 is a period for managing communication media supported by the wireless communication apparatus 22 and managing communication quality in order for the communication media control means 205 to manage the communication media management means 223. For this purpose, control messages are transmitted to and received from the communication media control means 205.

  Next, the operation of each component will be described. FIGS. 7 to 17 are flowcharts showing the operation of each means of the ground system 1 and the on-vehicle system 2 constituting the content synchronization system according to the first embodiment. The operation of each means will be described below.

  7 and 8 are flowcharts illustrating the operation of the synchronous communication control unit 101 of the ground cooperation server 10 according to the first embodiment. First, after starting the program (step S101), the synchronous communication control means 101 of the ground cooperation server 10 waits for reception of a message from the communication protocol processing means 104 of the ground cooperation server 10 (step S102).

  If the message has not been received (“No” in step S102), the synchronous communication control means 101 continues to wait for reception in step S102 until the message is received. On the other hand, when the message is received (“Yes” in step S102), the process proceeds to step S103.

  In step S103, the synchronous communication control unit 101 proceeds to step S104 when the type of the received message is “new organization information” or “division information”. On the other hand, when it is not “new organization information” or “division information”, the process proceeds to step S113.

  Next, the synchronous communication control means 101 notifies the ground service application access means 102 that the composition / division information has been received (step S104).

  Then, the synchronous communication control unit 101 registers the on-board cooperation server 20 that is the transmission source of the composition information in the composition management table shown in FIG. Further, in order to start information synchronization with the on-vehicle cooperation server 20, an INDEX synchronization timer for managing the timing at which the synchronous communication control means 101 synchronizes is started (step S105).

  Here, the organization management table shown in FIG. 18 is a database that manages the on-board system in which the synchronous communication control means 101 performs data synchronization. In step S105, the vehicle ID, IP address / link address, composition priority, and composition time of the on-board system 2 are registered. Each time INDEX synchronization is performed, the last synchronization time is updated.

  The vehicle ID is an identifier for identifying the on-vehicle system. The IP address / link address is a network address for identifying the wireless communication device of the on-board system. The IP address is used in the IP network, and the link address is used in the non-IP network. The IP address / link address is preset in the wireless communication device. The composition priority indicates the priority of the on-board system. The knitting time indicates the time when the on-board system is knitted. The last synchronization time indicates the latest time when the INDEX synchronization with the on-vehicle system is performed.

  Next, it is determined whether the INDEX synchronization timer started in step S105 has timed out (step S106). If the INDEX synchronization timer has not timed out (“No” in step S106), the synchronous communication control unit 101 waits for the timeout in step S106. On the other hand, when the INDEX synchronization timer times out (“Yes” in step S106), the process proceeds to step S107.

  Next, the synchronous communication control unit 101 acquires the updated identifier of the ground master DATA 103b from the ground master INDEX unit 103a of the information storage unit 103 (step S107).

  Next, the synchronous communication control unit 101 determines whether there is information to be transmitted simultaneously with the ground master INDEX unit 103a from the synchronization management table (FIG. 19) held by itself and the ground update unit 103e acquired in step S107. Is determined (step S108).

  Here, the synchronization management table shown in FIG. 19 is a database used when the synchronous communication control unit 101 synchronizes data. With reference to this database, the timing and order of data to be transmitted and received are determined based on the timing and priority of data synchronization, the period of synchronization, and the like.

  The data identifier is an identifier for identifying data, and corresponds to the number shown in FIG. The data transmission / reception type indicates at which timing data transmission / reception is performed when data synchronization is performed. "Mandatory" is always included when sending and receiving data, "Same as INDEX part" is sent at the same time when performing INDEX synchronization, and "By DATA type" is when the time equal to or longer than the update cycle has elapsed since the previous transmission and reception Send to. Further, “at the time of narrow area communication” is transmitted when connection to a narrow area communication medium becomes possible. The data priority is used to determine the order of synchronization according to the data priority when there is a plurality of data when performing data synchronization. The update cycle indicates the maximum allowable time of the cycle for synchronizing data, and synchronization is performed within the update cycle after the data is updated by the ground service application 11.

  If there is no ground master DATA to be transmitted simultaneously with the INDEX part (“No” in step S108), the ground master INDEX part 103a acquired in step S107 is held, and the process proceeds to step S109. On the other hand, when there is a ground master DATA to be transmitted simultaneously with the ground INDEX section (“Yes” in step S108), the ground master INDEX section 103a acquired in step S107 and the identifier of the corresponding ground master DATA are set. The process proceeds to step S109.

  In step S <b> 109, the synchronous communication control unit 101 passes the transmission request for the identifier of the terrestrial INDEX unit and terrestrial DATA held to the communication protocol processing unit 104.

  Next, it waits for a certain time for a response from the on-board system 2 that has made a transmission request in step S109 (step S110). If a response is not received within a certain time (“No” in step S111), the process returns to step S105, and the INDEX synchronization timer is restarted. On the other hand, if a response can be received within a certain time (“Yes” in step S111), the process proceeds to step S112.

  Next, in step S112, the synchronous communication control means 101 determines that the INDEX synchronization has been completed, registers the transmitted ground update unit 103e in the ground async unit 103h, and the ground update unit 103e and the on-board async unit 103f The identifier that has been deleted and the synchronization of DATA has been completed is deleted from the ground sync unit 103h (step S112). After the process of step S112 is completed, the process returns to step S105, and the processes from step S105 to step S112 are repeatedly executed.

  On the other hand, when the process proceeds to step S113 in step S103, the synchronous communication control unit 101 proceeds to step S114 when the type of the received message is “on-vehicle INDEX unit” or “on-vehicle DATA”. On the other hand, if it is not “on-vehicle INDEX section” or “on-vehicle DATA”, the process proceeds to step S119.

  Next, the synchronous communication control means 101 compares the ground Async unit 203h of the received on-vehicle INDEX unit with the ground Async unit 103h, deletes the identifier included in the ground Async unit 203h from the ground Async unit 103h, and further The on-board Update unit 203g of the INDEX unit is additionally registered in the on-board Update unit 103g. Further, when the on-board DATA is received, the identifier of the data is moved from the on-board Update unit 103g to the on-board Async unit 103f, and the on-board Update unit 103g is deleted (step S114).

  Next, it is determined whether or not there is information to notify the ground service application access means 102 that the update is made from the update monitoring table (FIG. 20) held by the synchronous communication control means 101 (FIG. 20). Step S115). If there is no information to notify the update (“No” in step S115), the process proceeds to step S117. On the other hand, when there is information to notify the update (“Yes” in step S115), the process proceeds to step S116.

  Here, the update monitoring table shown in FIG. 20 is a table for managing whether or not to voluntarily notify data when the data is updated to the ground service application 11 by the update notification “Notify”. . The update management table is set by data update notification setting (SetListener).

  The vehicle ID is an identifier that identifies the on-vehicle system. “ALL” indicates all on-board systems to be managed. The data identifier is an identifier for identifying data. The update notification is a flag indicating whether or not to notify the ground service application when the data of the corresponding data identifier is updated. In the case of “On”, the ground service application access unit 102 is notified that there is information to be updated, and in the case of “Off”, the ground service application access unit 102 is not notified that there is information to be updated.

  Next, the synchronous communication control unit 101 notifies the ground service application access unit 102 of the data identifier that needs to be updated (step S116).

  Then, the synchronous communication control means 101 determines whether or not to make an onboard DATA acquisition request from the onboard INDEX unit received at step S113 (step S117). If it is not necessary to make an on-board DATA acquisition request (“No” in step S117), the process of the synchronous communication control unit is completed, and the process returns to step S101. On the other hand, when making an acquisition request for on-board DATA (“Yes” in step S117), the transmission request is transmitted to the communication protocol processing means so as to transmit in order from the identifier of the information with high priority shown in FIG. It passes to 104 (step S118). After the process of step S118 is completed, the process of the synchronous communication control unit is completed, and the process returns to step S101.

  On the other hand, when the process proceeds to step S119 in step S113, the synchronous communication control unit 101 proceeds to step S120 when the type of the received message is “end notification” or “merger notification”. On the other hand, if it is not “end notification” or “merger notification”, the processing of the synchronous communication control means is completed and the process returns to step S101.

  Next, the synchronous communication control means notifies the ground service application access means 102 that the on-board system has ended (step S120), ends the INDEX synchronization timer for the corresponding on-board system, and the composition shown in FIG. The management table is updated (deleted) (step S121). After the process of step S121 is completed, the process of the synchronous communication control unit is completed, and the process returns to step S101.

  Here, the ground INDEX section transmitted in step S109 may transmit only the ground update section without including the on-board Async section, or the on-board Async section only when the on-board Async section is changed. May be sent simultaneously.

  When the on-board master INDEX unit is received in step S113, the number of synchronizations of the identifier registered in the on-board Async unit is incremented by 1, and the number of synchronizations of the identifier registered in the on-board Async unit in step S117 is increased. An on-vehicle DATA acquisition request may be made when the value exceeds a certain level.

  Further, in step S107, the ground sync section is confirmed at the same time as the ground master INDEX section, and if there is an identifier whose number of synchronizations exceeds a certain value, the corresponding ground data may be transmitted.

  In step S117, when an on-board DATA acquisition request is made, the request may be made in order from the on-board cooperation server 20 having a higher priority based on the composition priority shown in FIG. For example, as shown in FIG. 21, information with high priority is transmitted in order from the on-board cooperation server 20 with high priority.

  9 and 10 are flowcharts showing the operation of the ground service application access means 102 of the ground cooperation server 10 according to the first embodiment. After starting the program (step S201), the ground service application access means 102 of the ground cooperation server 10 waits for reception of a notification from the synchronous communication control means 101 of the ground cooperation server 10 (step S202).

  If a notification has not been received (“No” in step S202), the process proceeds to step S209. On the other hand, when the notification is received (“Yes” in step S202), the process proceeds to step S203.

  The ground service application access unit 102 determines whether or not the received notification is a notification of formation, termination, division, and merging of the on-board system 2 (step S203). When the received notification is not a notification of composition, end, division, and merge (“No” in step S203), the process proceeds to step S205. On the other hand, if the received notification is a notification of composition, end, division, and merge (“Yes” in step S203), the process proceeds to step S204.

  Next, the ground service application access unit 102 sets the state of the received notification, and notifies the ground service application 11 of the state of the on-board system 2 using the API “Accept”. After the process of step S204 is completed, the process returns to step S201.

  On the other hand, when the process proceeds to S205 in step S203, the ground service application access unit 102 determines whether or not the received notification is an information update notification (step S205). When the received notification is not an update notification (“No” in step S205), the process proceeds to step S207. On the other hand, when the received notification is an update notification (“Yes” in step S205), the process proceeds to step S206.

  Next, the ground service application access unit 102 acquires the corresponding information from the information storage unit 103 based on the received update notification, and the information on the on-board system 2 is transmitted to the ground service application 11 using the API “Notify”. Notify that it has been updated. After the process of step S206 is completed, the process returns to step S201.

  On the other hand, when the process proceeds to S207 in step S205, the ground service application access unit 102 determines whether or not the received notification is a communication medium connection state notification (step S207). If the received notification is not a connection state notification (“No” in step S207), the process returns to step S201. On the other hand, when the received notification is a connection state notification (“Yes” in step S207), the process proceeds to step S208.

  In step S208, the ground service application access unit 102 notifies the ground service application 11 that the communication state with the on-board system 2 has been changed by the API “LanConnect” from the received notification. After the process of step S208 is completed, the process returns to step S201.

  On the other hand, when the process proceeds to S209 in step S202, the ground service application access unit 102 waits for API reception from the ground service application 11 (step S209). If no message is received from the ground service application 11 (“No” in step S209), the process returns to step S202. On the other hand, when a message is received from the ground service application 11 (“Yes” in step S209), the process proceeds to step S210.

  Next, the ground service application access unit 102 determines whether or not the API “Get” is received from the ground service application 11. If the API “Get” has not been received (“No” in step S210), the process proceeds to step S213. On the other hand, when the API “Get” is received (“Yes” in step S210), the process proceeds to step S211.

  Next, the ground service application access unit 102 acquires the information requested by “Get” from the information storage unit 103 (step S211), and passes the acquired information to the ground service application 11 (step S212). After the process of step S212 is completed, the process returns to step S201.

  On the other hand, when the process proceeds to S213 in step S210, the ground service application access unit 102 determines whether or not the API “Set” is received from the ground service application 11. If the API “Set” has not been received (“No” in step S213), the process returns to step S201. On the other hand, when the API “Set” is received (“Yes” in step S213), the process proceeds to step S214.

  Next, the ground service application access unit 102 sets the information requested by “Set” in the information storage unit 103, registers the identifier of the information set in the ground update unit (step S214), and the ground service application 11 The result of the setting is passed (step S215). After the process of step S215 is completed, the process returns to step S201.

  Here, in step S211, the on-board Update unit may be acquired at the same time, and it may be determined whether or not the data requested by “Get” is the latest, and notified in step S212.

  FIG. 11 is a flowchart showing the operation of the communication protocol processing means 104 of the ground cooperation server 10 according to the first embodiment. After starting the program (step S301), the communication protocol processing means 104 of the ground cooperation server 10 waits for reception of a message transmission request from the synchronous communication control means 101 of the ground cooperation server 10 (step S302).

  If a transmission request has not been received (“No” in step S302), the process proceeds to step S308. On the other hand, when a transmission request is received (“Yes” in step S302), the process proceeds to step S303.

  Next, the communication protocol processing unit 104 obtains the INDEX part and DATA for which transmission has been requested from the information storage unit 103 (step S303), and obtains header information including the type of message to be transmitted and flags such as division / retransmission. The transmission message is generated by giving the message (step S304).

  Then, the communication protocol processing means 104 selects and transmits the wireless base station 12 that transmits the generated message, and at the same time waits for a response from the on-board system 2 (step S305). Further, if retransmission control is valid, a retransmission timer is started (step S306). If the retransmission control is invalid, the processing of the communication protocol processing unit is completed, and the process returns to step S301.

  Next, it is determined whether or not an acknowledgment is received from the on-board system 2 before the retransmission timer times out. If the confirmation response is not received before the time-out (“No” in step S307), the process returns to step S305 to retransmit the same message. On the other hand, when the confirmation response is received before the timeout (“Yes” in step S307), the processing of the communication protocol processing unit is completed, and the process returns to step S301. If a timeout has occurred for a certain number of times, the message retransmission is stopped and the process returns to step S301.

  On the other hand, when the process proceeds to S308 in step S302, the communication protocol processing unit 104 waits for reception of a message from the radio base station 12. If no message has been received (“No” in step S308), the processing of the communication protocol processing means 104 is completed, and the process returns to step S301. On the other hand, when a message is received (“Yes” in step S308), the process proceeds to step S309.

  In step S309, the communication protocol processing means 104 assembles data if the received message is divided, and proceeds to step S310 as it is if it is not divided.

  Next, the communication protocol processing unit 104 saves the information portion from the received message in the information storage unit 103 (step S310), and notifies the synchronization control processing unit of the type of the received message (step S311).

  Next, the communication protocol processing means 104 determines whether or not a response is necessary from the received message type (step S312). If no response is required for the received message (“No” in step S312), the processing of the communication protocol processing unit 104 is completed, and the process returns to step S301. On the other hand, when a response is required for the received message (“Yes” in step S312), the process proceeds to step S313.

  In step S313, the communication protocol processing means 104 generates a response message and transmits it to the radio base station 12 for transmission. After the process of step S313 is completed, the process returns to step S301.

  FIGS. 12 and 13 are flowcharts showing the operation of the synchronous communication control means 201 of the on-board cooperation server 20 according to the first embodiment. After starting the program (step S401), the synchronous communication control unit 201 of the onboard cooperation server 20 waits for reception of a message from the communication protocol processing unit 204 of the onboard cooperation server 20 (step S402).

  If the message has not been received (“No” in step S402), the synchronous communication control unit 201 proceeds to step S414. On the other hand, when the message is received (“Yes” in step S402), the process proceeds to step S403.

  In step S403, the synchronous communication control unit 201 proceeds to step S404 when the type of the received message is “terrestrial INDEX unit”. On the other hand, if it is not the “terrestrial INDEX unit”, the process proceeds to step S412.

  Next, the synchronous communication control unit 201 notifies the on-vehicle service application access unit 202 that the ground INDEX information of the ground system has been received (step S404), and the synchronous communication control unit 201 receives the on-vehicle Async. The unit 103f and the on-board Async unit 203f are compared, the identifier included in the on-board Async unit 103f is deleted from the on-board Async unit 203f, and the ground update unit 103e is additionally registered in the ground update unit 203e (step S405).

  Then, the synchronous communication control unit 201 acquires the updated identifier of the on-board master DATA 203d from the on-board master INDEX unit 203c of the information storage unit 203 (step S406).

  Next, the synchronous communication control means 201 has a synchronization management table (FIG. 19) held by itself, and whether there is information to be transmitted simultaneously with the on-board master INDEX section 203c from the on-board update section 203g acquired at step S406. Is determined (step S407).

  If there is no on-board master DATA to be transmitted simultaneously with the INDEX section (“No” at step S407), the on-board master INDEX section 203c acquired at step S406 is held, and the process proceeds to step S408. On the other hand, when there is an on-board master DATA to be transmitted simultaneously with the on-vehicle INDEX unit (“Yes” at step S407), the on-vehicle master INDEX unit 203c acquired at step S406 and the corresponding on-vehicle master. The identifier of DATA is held and the process proceeds to step S408.

  In step S <b> 408, the synchronous communication control unit 201 passes the held transmission request for the INDEX unit and DATA identifier to the communication protocol processing unit 204.

  Next, in step S409, a response from the ground system 1 that has made the transmission request in step S408 is waited for a predetermined time (step S409). If the response is not received within a certain time (“No” in step S410), the process is completed and the process returns to step S401. On the other hand, if a response can be received within a certain time (“Yes” in step S410), the process proceeds to step S411.

  In step S410, the synchronous communication control unit 201 determines that the INDEX synchronization has been completed, registers the on-board Update unit 203g that has transmitted the data to the on-board Async unit 203f, and deletes the on-board Update unit 203g and the ground Async unit 203h. (Step S411). After the process of step S411 is completed, the process returns to step S401.

  On the other hand, when the process proceeds to step S412 in step S403, the synchronous communication control unit 201 proceeds to step S413 when the type of the received message is “terrestrial DATA” (“Yes” in step S412). On the other hand, if it is not “terrestrial DATA” (“No” in step S412), the process is completed and the process returns to step S401.

  Next, the synchronous communication control unit 201 copies the received identifier of the terrestrial DATA from the terrestrial update unit 203e to the terrestrial async unit 203h, and deletes the terrestrial update unit 203e (step S413).

  Next, it is determined whether or not there is information that notifies the on-board service application access unit 202 that the update is made from the update monitoring table (FIG. 20) held by the synchronous communication control unit 201. (Step S414). If there is no information to notify the update (“No” in step S414), the process proceeds to step S401. On the other hand, when there is information to notify the update (“Yes” in step S414), the process proceeds to step S415.

  Next, in step S415, the synchronous communication control unit 201 notifies the on-board service application access unit 202 that there is information to notify the update and the data identifier of the information to be notified (step S415).

  On the other hand, when the process proceeds to S416 in step S402, the synchronous communication control unit 201 determines whether or not to receive a narrowband communication connection notification from the communication media management unit 205 (step S416). If the narrow-area communication connection notification is not received (“No” in step S416), the process is completed and the process returns to step S401. On the other hand, when the narrow-area communication connection notification is received (“Yes” in step S416), the process proceeds to step S417.

  Next, the synchronous communication control means 201 acquires on-board information to be transmitted during narrow-area communication from the synchronization management table held by itself, and passes the identifier of the on-vehicle information to be transmitted to the communication protocol processing means 204 (step S417), waiting for a response from the ground system 1 (step S418).

  When the response from the ground system 1 cannot be received (“No” in S419), the process of the synchronous communication control unit 201 is completed, and the process returns to Step S401. On the other hand, when a response can be received from the ground system 1 (“Yes” in S419), the process proceeds to step S420.

  Next, the synchronous communication control unit 201 determines that the transmission of the information unit has been completed, and deletes the on-board Async unit for the identifier of the transmitted information (step S420). After the process of step S420 is completed, the process returns to step S401.

  Here, the on-vehicle INDEX unit that transmits in step S408 may transmit only the on-board Update unit without including the ground Async unit, or the ground Async unit is changed only when the ground Async unit is changed. It may be transmitted simultaneously with the on-board Update section.

  When the ground master INDEX unit is received in step S405, the number of synchronizations of identifiers registered in the ground Async unit is incremented by 1. After step S408, the number of synchronizations of identifiers registered in the ground Async unit is increased. You may make a request for acquisition of terrestrial DATA when it exceeds a certain level.

  Further, in step S406, the on-board ASYNC section is confirmed simultaneously with the on-board master INDEX section, and if there is an identifier whose number of synchronizations exceeds a certain value, the corresponding on-board DATA may be transmitted.

  14 and 15 are flowcharts showing the operation of the onboard service application access means 202 of the onboard cooperation server 20 according to the first embodiment. After starting the program (step S501), the onboard service application access unit 202 of the onboard cooperation server 20 waits for reception of a notification from the synchronous communication control unit 201 of the onboard cooperation server 20 (step S502).

  When the notification has not been received (“No” in step S502), the process proceeds to step S507. On the other hand, when a notification is received (“Yes” in step S502), the process proceeds to step S503.

  Next, the on-board service application access means 202 determines whether or not the received notification is an information update notification (step S503). If the received notification is not an update notification (“No” in step S503), the process proceeds to step S505. On the other hand, when the received notification is an update notification (“Yes” in step S503), the process proceeds to step S504.

  Next, in step S504, the on-board service application access unit 202 obtains information on the data identifier of the received update notification from the information storage unit 203, and the ground system 1 uses the API “Notify” for the on-board service application 21. Notify that the information was updated along with the information. After the process of step S504 is completed, the process returns to step S501.

  On the other hand, when the process proceeds to S505 in step S503, the on-board service application access unit 202 determines whether or not the received notification is a communication medium connection state notification (step S505). If the received notification is not a connection state notification (“No” in step S505), the process returns to step S501. On the other hand, when the received notification is a connection state notification (“Yes” in step S505), the process proceeds to step S506.

  In step S506, the on-board service application access means 202 notifies the on-board service application 21 that the communication state with the ground system 1 has been changed by the API “LanConnect” from the received notification. After the process of step S506 is completed, the process returns to step S501.

  On the other hand, when the process proceeds to S507 in step S502, the on-board service application access unit 202 waits for reception of a message from the on-board service application 21 through the API (step S507). If the API is not received from the on-vehicle service application 21 (“No” in step S507), the process returns to step S501. On the other hand, when a message is received from the on-board service application 21 (“Yes” in step S507), the process proceeds to step S508.

  Next, the vehicle service application access unit 202 determines whether or not the API “Get” is received from the vehicle service application 21. If the API “Get” has not been received (“No” in step S508), the process proceeds to step S511. On the other hand, when the API “Get” is received (“Yes” in step S508), the process proceeds to step S509.

  Next, the on-board service application access unit 202 acquires the information requested by “Get” from the information storage unit 203 (step S509), and passes the acquired information to the on-board service application 21 (step S510). After the process of step S510 is completed, the process returns to step S501.

  On the other hand, when the process proceeds to S511 in step S508, the on-board service application access unit 202 determines whether or not the API “Set” is received from the on-board service application 21. If the API “Set” has not been received (“No” in step S511), the process returns to step S501. On the other hand, when the API “Set” is received (“Yes” in step S511), the process proceeds to step S512.

  Next, the on-board service application access unit 202 sets the information requested by “Set” in the information storage unit 203, and at the same time sets the updated information in the on-board Update unit (step S512). Furthermore, the setting result is passed to the on-board service application 21 (step S513). After the process of step S513 is completed, the process returns to step S501.

  FIG. 16 is a flowchart showing the operation of the communication protocol processing means 204 of the on-board cooperation server 20 according to the first embodiment. After starting the program (step S601), the communication protocol processing means 204 of the onboard cooperation server 20 waits for reception of a message transmission request from the synchronous communication control means 201 of the onboard cooperation server 20 (step S602).

  If a transmission request has not been received (“No” in step S602), the process proceeds to step S608. In contrast, when a transmission request is received (“Yes” in step S602), the process proceeds to step S603.

  Next, the communication protocol processing unit 204 obtains information on the data identifier requested to be transmitted from the information storage unit 203 (step S603), and obtains header information including the type of message to be transmitted and flags such as division / retransmission. And a transmission message is generated (step S604).

  Then, the communication protocol processing unit 204 selects and transmits the wireless communication device 22 that transmits the generated message, and at the same time waits for a response from the ground system 1 (step S605). Further, if retransmission control is valid, a retransmission timer is started (step S606). If the retransmission control is invalid, the processing of the communication protocol processing unit is completed, and the process returns to step S601.

  Next, the communication protocol processing unit 204 determines whether or not to receive an acknowledgment from the ground system 1 before the retransmission timer times out. If an acknowledgment is not received before the timeout (“No” in step S607), the process returns to step S605 to retransmit the same message. On the other hand, when the confirmation response is received before the timeout (“Yes” in step S607), the processing of the communication protocol processing unit is completed, and the process returns to step S601. If a timeout has occurred for a certain number of times, the message retransmission is stopped and the process returns to step S601.

  On the other hand, when the process proceeds to S608 in step S602, the communication protocol processing unit 204 waits for reception of a message from the wireless communication device 22. If no message has been received (“No” in step S608), the processing of the communication protocol processing unit 204 is completed, and the process returns to step S601. On the other hand, when a message is received (“Yes” in step S608), the process proceeds to step S609.

  Next, the communication protocol processing unit 204 assembles data when the received message is divided, and proceeds to step S610 as it is when it is not divided.

  Next, the communication protocol processing unit 204 saves the information part from the received message in the information storage unit 203 (step S610), and notifies the synchronization control processing unit of the type of the received message (step S611).

  Next, the communication protocol processing means 204 determines whether or not a response is necessary from the type of the received message (step S612). If no response is required for the received message (“No” in step S612), the processing of the communication protocol processing unit 204 is completed, and the process returns to step S601. On the other hand, when a response is required for the received message (“Yes” in step S612), the process proceeds to step S613.

  In step S613, the communication protocol processing unit 204 generates a response message and transmits it to the wireless communication device 22 for transmission. After the process of step S613 is completed, the process returns to step S601.

  FIG. 17 is a flowchart showing an operation for monitoring the information storage means of the communication protocol processing means 104 of the ground cooperation server 10 according to the first embodiment. In this operation, the communication protocol processing means 204 of the on-board cooperation server 20 performs the same operation, and therefore the flowchart of the communication protocol processing means 204 of the on-board cooperation server is omitted. The operation of monitoring the information storage means may be performed by the communication protocol processing means 104 or the synchronous communication control means 101.

  After starting the program (step S701), the communication protocol processing means 104 of the ground cooperation server 10 monitors information specified in advance in the update monitoring table among the information stored in the information storage means 103 of the ground cooperation server 10 (step S702). ).

  The communication protocol processing means 104 periodically monitors whether the monitored information has been updated (step S703). If the monitored information has not been updated (“No” in step S703), the process returns to step S702 to continue monitoring. On the other hand, when the monitored information is updated (“Yes” in step S703), the process proceeds to step S704.

  Next, the communication protocol processing unit 104 acquires the updated information from the information storage unit 103 (step S704), adds header information including a type of message to be transmitted, a flag such as division / retransmission, and the like. A transmission message is generated (step S705).

  Then, the communication protocol processing means 104 selects and transmits the wireless base station 12 that transmits the generated message, and at the same time waits for a response from the on-board system 2 (step S706). Further, if retransmission control is valid, a retransmission timer is started (step S707). If the retransmission control is invalid, the processing of the communication protocol processing unit is completed, and the process returns to step S701.

  In step S708, it is determined whether or not an acknowledgment is received from the onboard system 2 before the retransmission timer times out. If the confirmation response is not received before the timeout (“No” in step S708), the process returns to step S706 to retransmit the same message. On the other hand, when the confirmation response is received before the timeout (“Yes” in step S708), the processing of the communication protocol processing unit is completed, and the process returns to step S701. If a timeout has occurred for a certain number of times, the message retransmission is stopped and the process returns to step S701.

  From the above, the above-described content is the description of the configuration and operation of the content synchronization system in the embodiment of the present invention. In the present embodiment, an example of an operation assuming that SNMP is applied to the communication protocol processing unit 104 of the ground cooperation server 10 and the communication protocol processing unit 204 of the on-board cooperation server 20 has been described, but instead of SNMP. Other protocols capable of bidirectional communication may be used.

  In the present embodiment, the information storage means 103 of the ground cooperation server 10 and the information storage means 203 of the on-board cooperation server 20 are shown as an operation example as a database having a plurality of pieces of information, but as shown in FIG. A tree structure such as MIB (Management Information Base) as used in SNMP may be used, or other database structures may be applied.

  Here, the information storage means 103 shown in FIG. 22 is a database in which a set of data generated by each of the ground system 1 and the on-vehicle system 2 is integrated. The on-board cooperation server 20 has one information storage means 103 per vehicle, and the ground cooperation server 10 has information storage means 103 for the number of trains managed per vehicle.

  The information folder is managed in the MIB format. MIB is a representation format of information managed by SNMP (Simple Network Management Protocol), and can be easily managed because it is configured in a tree structure. Each data of the information storage means 103 shown in FIG. 22 is assigned an identifier, and a number is given after each data item. For example, the entire on-board information can be represented by 0.0, and the diagram can be represented by 0.1.0. The local variable of the data identifier 1.2 stores data managed in the ground cooperation server and the on-vehicle cooperation server.

  In the above embodiment, the ground information and the on-board information are stored in the information storage means 103 of the ground cooperation server 10 and the information storage means 203 of the on-board cooperation server 20, but as shown in FIG. It may be configured to include information on retransmission and division that is included in, and may be synchronized with the transmission of INDEX.

  A data identifier 0.3 shown in FIG. 23 indicates a communication header. By transmitting this identifier, a communication header can be added as a part of data without newly defining a communication header. And can be divided and assembled.

  In the above embodiment, the organization management table, synchronization management table, and update monitoring table are handled as data managed by the synchronous communication control means. However, these data are handled as data in the information storage means, and these data are synchronized between linked servers. May be.

  From the above, it can be seen that the content synchronization system of the present invention has the following effects. The content synchronization system according to the present invention centrally manages information on the ground system and on-board system, and has a mechanism for synchronizing information between the ground cooperation server and the on-board cooperation server asynchronously with the communication request of the service application. provide. As a result, ground-to-vehicle communication is concealed from the service application, and the service application can immediately notify the latest information of the cooperation server. At this time, it is also possible to notify whether the information managed by the cooperation server is new or old by managing the last update time.

  Also, the content synchronization system described in the present invention collectively manages data that is managed or requested by a plurality of service applications, and the cooperation server collectively transmits and receives. As a result, it is possible to avoid transmitting and receiving the same type of information from a plurality of applications, and therefore it is possible to prevent unnecessary communication traffic from being transmitted on the communication band.

  Also, the content synchronization system according to the present invention manages an identifier of information changed by a service application as the update data identifier, and periodically exchanges the update data identifier between linked servers. Therefore, it is possible to make an acquisition request for the information main body to each priority or data type, or to the on-board system with a high priority at a timing determined by the cooperation server only when updated information exists. As a result, only minimum information can be transmitted and received, and transmission and reception can be performed at a necessary timing, so that it is possible to suppress the amount of traffic transmitted on the communication band.

  In addition, the content synchronization system according to the present invention determines whether updated information exists by managing an identifier of information that is not synchronized between linked servers as the unsynchronized data identifier. It is possible to notify the service application whether or not it is the latest information.

  Further, the content synchronization system according to the present invention can easily discriminate between data that is synchronized between the ground system and the on-board system and data that is not synchronized by configuring the information storage means in a tree structure. It becomes possible. Further, by adopting a tree structure, it becomes possible to collectively transmit and receive the leaves below the tree, so that data that needs to be transmitted can be efficiently transmitted. Further, since it is not necessary to specify the identifier of each data when transmitting the update data identifier, it is possible to suppress the amount of traffic transmitted on the communication band.

  In addition, the content synchronization system according to the present invention has a communication network bandwidth in order to start transmission of the onboard master INDEX of the onboard cooperation server when the onboard cooperation server receives the ground master INDEX. It becomes possible to perform transmission scheduling according to the situation. Thereby, when the network is congested, the ground cooperation server can suppress the transmission of the ground INDEX and efficiently transmit and receive information.

  Further, the content synchronization system according to the present invention determines whether or not to transmit the terrestrial DATA by determining whether or not to transmit the terrestrial master DATA according to the data type and priority when transmitting the terrestrial master INDEX. Transmission can be performed efficiently.

  In addition, the content synchronization system according to the present invention monitors data specified by a service application or data that has been defined in advance, thereby transmitting a message when a change occurs in the monitored data. It becomes possible to do. Thereby, emergency information etc. can be transmitted with a short delay time.

  In addition, the content synchronization system according to the present invention includes, in addition to the data set by the ground service application, the data set by the on-board service application, the ground INDEX, and the on-vehicle INDEX in the information storage means. It is configured by adding header information such as type, retransmission flag, and division flag. As a result, when the communication protocol processing means does not support the retransmission function or the division function, the ground cooperation server and the on-vehicle cooperation server can provide the retransmission function and the division function.

  In addition, the content synchronization system according to the present invention can recognize not only the update state by the Update unit but also the synchronization state with the other server by the Async unit, and therefore can recognize whether information can be transmitted. As a result, even if the communication protocol processing means does not have a retransmission function, it is possible to retransmit data that is not synchronized.

  In addition, since the content synchronization system according to the present invention has the number of synchronizations incremented every time the Update part is received, in addition to the data identifier registered in the Sync part, when the number of synchronizations exceeds a certain value. The data acquisition request can be transmitted to the other station. As a result, the number of synchronizations is increased each time the update unit is received, and an acquisition request is issued when the number exceeds a certain level, so that processing such as an update period can be reduced compared to management.

  In addition, the content synchronization system according to the present invention transmits the number of synchronizations simultaneously with the INDEX unit, and when the cooperation server that has received the number of synchronizations has data whose synchronization number is more than a certain value, the data is transmitted. be able to. Therefore, the latest data can be transmitted from the cooperation server on the data management side when the data body portion has been updated and the ground and the vehicle have not been synchronized for a certain time or more.

It is the figure which showed the outline of the structure of the content synchronization system which concerns on Embodiment 1 of this invention. It is the figure which showed the detail of the structure of the ground system in the content synchronization system which concerns on Embodiment 1 of this invention. It is the figure which showed the detail of the structure of the on-board system in the content synchronization system which concerns on Embodiment 1 of this invention. It is the figure which showed an example of the application interface in the content synchronization system which concerns on Embodiment 1 of this invention. It is the figure which showed the detail of the structure of the information storage means of the ground system in the content synchronization system which concerns on Embodiment 1 of this invention. It is the figure which showed the detail of the structure of the information storage means of the on-board system in the content synchronous system which concerns on Embodiment 1 of this invention. It is the flowchart which showed operation | movement of the synchronous communication control means of the ground system in the content synchronous system which concerns on Embodiment 1 of this invention. It is the flowchart which showed operation | movement of the synchronous communication control means of the ground system in the content synchronous system which concerns on Embodiment 1 of this invention. It is the flowchart which showed operation | movement of the ground service application access means of the ground system in the content synchronous system which concerns on Embodiment 1 of this invention. It is the flowchart which showed operation | movement of the ground service application access means of the ground system in the content synchronous system which concerns on Embodiment 1 of this invention. It is the flowchart which showed operation | movement of the communication protocol processing means of the ground system in the content synchronization system which concerns on Embodiment 1 of this invention. It is the flowchart which showed operation | movement of the synchronous communication control means of the on-board system in the content synchronous system which concerns on Embodiment 1 of this invention. It is the flowchart which showed operation | movement of the synchronous communication control means of the on-board system in the content synchronous system which concerns on Embodiment 1 of this invention. It is the flowchart which showed operation | movement of the on-board service application access means of the on-board system in the content synchronization system which concerns on Embodiment 1 of this invention. It is the flowchart which showed operation | movement of the on-board service application access means of the on-board system in the content synchronization system which concerns on Embodiment 1 of this invention. It is the flowchart which showed operation | movement of the communication protocol processing means of the on-board system in the content synchronization system which concerns on Embodiment 1 of this invention. It is the flowchart which showed the update notification production | generation operation | movement of the communication protocol processing means of the ground system in the content synchronization system which concerns on Embodiment 1 of this invention. It is the figure which showed the organization management table in the content synchronization system which concerns on Embodiment 1 of this invention. It is the figure which showed the synchronous management table in the content synchronous system which concerns on Embodiment 1 of this invention. It is the figure which showed the update monitoring table in the content synchronization system which concerns on Embodiment 1 of this invention. It is the sequence diagram which showed the example of data transmission in the content synchronization system which concerns on Embodiment 1 of this invention. It is the figure which showed an example of the detail of a structure of the information storage means in the content synchronization system which concerns on Embodiment 1 of this invention. It is the figure which showed an example of the detail of a structure of the information storage means in the content synchronization system which concerns on Embodiment 1 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Ground system, 10 Ground cooperation server, 11 Ground service application, 12 Wireless base station, 13 Communication network, 2 On-vehicle system, 20 On-vehicle cooperation server, 21 On-vehicle service application, 22 Wireless communication apparatus, 101 Synchronous communication control means 102, ground service application access means, 103 information storage means, 104 communication protocol processing means, 105 communication media control means, 103a ground master INDEX section, 103b ground master DATA, 103c on-vehicle mirror INDEX section, 103d on-vehicle mirror DATA, 103e Ground update section, 103f on-board async section, 103g on-board update section, 103h ground sync section, 111 reception data processing means, 112 transmission data generation means, 121 transmission means, 22 receiving means, 123 communication media management means, 201 synchronous communication control means, 202 on-vehicle service application access means, 203 information storage means, 204 communication protocol processing means, 205 communication media control means, 203a ground mirror INDEX unit, 203b ground mirror DATA, 203c On-board master INDEX section, 203d On-board master DATA, 203e Ground update section, 203f On-board sync section, 203g On-board update section, 203h On-ground sync section, 211 Reception data processing section, 212 Transmission data generation section, 221 Transmission means 222 Reception means 223 Communication media management means

Claims (15)

In a content synchronization system for sharing information between a mobile system provided on a mobile object and a ground system connected to the mobile system via a communication network and provided on the ground,
The ground system is
A ground service application for managing information provided to the mobile system;
A ground cooperation server comprising information on the ground system and the system on the moving body, and synchronizing the information between the ground system and the system on the moving body;
A radio base station that transmits and receives information on the ground system and the mobile system to and from the mobile system;
A communication network connecting the ground service application, the ground cooperation server, and the wireless base station,
The mobile system is
A mobile service application that manages information providing the functions of the mobile system;
A mobile on-board cooperation server comprising information on the mobile system and the ground system, and synchronizing the information between the mobile system and the ground system;
A wireless communication device that transmits and receives information on the ground system and the mobile system with the ground system,
The ground cooperation server and the on-mobile cooperation server transmit / receive information on the ground system and the on-mobile system to each other in response to a request from the ground service application and the mobile service application or at a predetermined cycle. A content synchronization system that synchronizes the information. Information on the ground system and the mobile system is
Data indicating the information body of the ground system and the mobile system;
An update data identifier indicating whether or not the data has been updated,
The ground cooperation server and the mobile cooperation server transmit and receive the update data identifier to each other in response to a request from the ground service application and the mobile service application or at a predetermined cycle, and based on the update data identifier, The content synchronization system according to claim 1, wherein information on the ground system and the system on the moving object is synchronized. Information on the ground system and the mobile system is
Further comprising an asynchronous data identifier indicating that the synchronization of the update data identifier has been completed but the synchronization of the data corresponding to the update data identifier is incomplete,
The ground cooperation server and mobile cooperation server are:
The content synchronization according to claim 2, wherein the asynchronous data identifier is registered according to the update data identifier transmitted and received with each other, and the asynchronous data identifier is deleted when the synchronization of the data corresponding to the asynchronous data identifier is completed. system. The ground cooperation server is
A first index composed of data on the ground system and on-mobile system data, an update data identifier of information on the ground system and an asynchronous data identifier of information on the mobile system, and information on the information on the mobile system A first information storage means having a second index composed of an update data identifier and an asynchronous data identifier of the information of the ground system;
First synchronous communication control means for transmitting the first index to the on-mobile system at a predetermined cycle;
A ground service application access means for providing an interface with the ground service application;
First communication protocol processing means for controlling communication with the mobile system;
First communication media control means for managing communication media supported by the radio base station and managing communication quality,
The mobile cooperation server is
A third index composed of data on the ground system and on-mobile system data, an update data identifier of information on the ground system and an asynchronous data identifier of information on the mobile system, and information on the information on the mobile system A second information storage means having a fourth index composed of an update data identifier and an asynchronous data identifier of the information of the ground system;
Triggered by receiving the first index transmitted from the first synchronous communication control means, the second and third indexes are updated, and the fourth index is transmitted to the ground system. Synchronous communication control means,
Mobile service application access means for providing an interface with the mobile service application;
Second communication protocol processing means for controlling communication with the ground system;
A second communication media control means for managing the communication media supported by the wireless communication device and managing the communication quality,
4. The content synchronization system according to claim 3, wherein the first synchronous communication control unit updates the first and second indexes when the fourth index is received. 5. The first and second synchronous communication control means include
The content according to claim 4, wherein when the update data identifier is transmitted at a predetermined cycle, the data corresponding to the update data identifier is simultaneously transmitted according to a data type and priority corresponding to the data identifier. Synchronous system. A plurality of systems on the moving body are configured,
The first synchronous communication control means includes
The content synchronization system according to claim 4, wherein the data is transmitted and received based on a priority of the mobile system. The first and second information storage means include
5. The content synchronization system according to claim 4, wherein the update data identifier is configured in a tree structure different from the data corresponding to the update data identifier. The first and second synchronous communication control means include
The data specified by the ground service application and the mobile service application or the predefined data is periodically monitored, and when the data being monitored changes, the first and The content synchronization system according to claim 4, wherein the second communication protocol processing means requests transmission of the data. The first and second information storage means include
The content synchronization system according to claim 4, further comprising header information such as a type of the data to be transmitted, a retransmission flag, and a division flag. The first and second information storage means include
It further includes synchronization number information that is incremented every time an update data identifier is received,
The first and second synchronous communication control means include
5. The content synchronization system according to claim 4, wherein the acquisition of the data of the ground system and the mobile unit system is requested when the synchronization number information reaches a predetermined number of times or more. The first and second synchronous communication control means include
The synchronization number information is transmitted simultaneously with the update data identifier and the asynchronous data identifier, and when the received synchronization number information is a predetermined number or more, the data of the ground system and the mobile unit system is transmitted. The content synchronization system according to claim 10. The first and second communication protocol processing means include:
A format in which the data is converted into a message format that can be transmitted by the radio base station and the radio communication device, or a message received from the radio base station and the radio communication device can be stored in the first and second information storage means. The content synchronization system according to claim 4, wherein the content synchronization system is converted into: The above-mentioned system on the moving body is an on-vehicle system that manages on-vehicle information such as train number, train, train, automobile, etc. traveling on the ground, position, speed, traveling prediction, crew information, and failure information,
The ground system is a ground system that manages ground information such as a diagram indicating a travel route to be provided to the on-board system, a schedule indicating a route to be opened, a route opening prediction, a peripheral train position, and operation information. 13. The content synchronization system according to any one of 1 to 12. Provided on the ground system, which is provided on the ground and connected to the mobile system provided on the mobile body via a communication network,
The information on the ground system and the system on the moving body is provided, the information on the ground system is transmitted on demand or in a predetermined cycle, and the information on the system on the moving body is received. The ground cooperation server apparatus which synchronizes the said information between. Provided on a mobile system provided on a mobile body, connected to a ground system provided on the ground via a communication network,
The system includes information on the mobile system and the ground system, transmits information on the mobile system on demand or at a predetermined cycle, and receives information on the ground system to receive information on the ground system. The on-mobile cooperation server device that synchronizes the information between them.

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