JP5693554B2 - Distribution system and distribution method - Google Patents

Description

  The present invention relates to an emergency information delivery system and delivery method.

  In recent years, services that detect or predict the occurrence of a disaster and distribute emergency information via a mobile communication network, the Internet, or the like have been used. As such a service, for example, a service that predicts the arrival of an earthquake wave and distributes an earthquake early warning is known (see, for example, Patent Document 1).

  In the earthquake early warning distribution service, immediately after an earthquake occurs, observation data measured by a seismometer near the epicenter is analyzed by an organization such as the Japan Meteorological Agency. Then, information such as the epicenter and the magnitude (magnitude) of the earthquake is distributed to the user's mobile terminal in the corresponding area (for example, an area having a seismic intensity of 3 or more) via the distribution server. In the portable terminal that has received the information, the occurrence of the earthquake is notified to the user by a pop-up display, a predetermined warning sound, or the like.

  With such a service, the user can recognize the occurrence or arrival of a disaster even when away from home, and can start evacuation and ensuring safety.

  FIG. 10 is a diagram illustrating an example of a schematic configuration of a distribution system 11 using a CBS (Cell Broadcast Service) system.

  When the distribution server (Cell Broadcast Center, CBC) 2 receives an earthquake early warning message from an organization such as the Japan Meteorological Agency (not shown), it creates a message body of the earthquake early warning. That is, with reference to a predetermined table using an “Earthquake Place Name Code” indicating the epicenter included in the emergency earthquake bulletin message as a key, the “Epicenter Name” is extracted and inserted into the message body.

  Next, the distribution server 2 refers to a predetermined table in order to specify the distribution area of the earthquake early warning using a “region code” indicating a region where strong shaking is estimated, which is included in the earthquake early warning message as a key. Then, a “city / town / town identification code” indicating the corresponding city / town / village is extracted. Here, the municipality identification code is a code that uniquely identifies municipalities throughout the country. The distribution server 2 manages a table of information related to the base station 5 arranged in each municipality for each municipality identification code, and refers to this table using the extracted municipality identification code as a key. The station 5 and its subordinate cells, the radio network controller (Radio Network Controller, RNC) 4 that accommodates the base station 5 and the like are specified.

  Then, the distribution server 2 creates a message including a list of identification information (ID) of each identified cell, the created message body, etc., and transmits a copy thereof to each identified RNC 4.

  The RNC 4 that has received the message transmits a copy of the received message to each base station 5 that it accommodates. Further, if the cell ID list included in the received message includes the cell ID of the subordinate cell in the cell ID list included in the received message, the base station 5 that has received the message receives each mobile terminal 6 located in that cell. Then, the message body included in the received message is broadcast.

  With such a configuration, the earthquake early warning can be distributed only to mobile terminals located in a specific cell. However, since the size of the cell ID list generally increases, there is a problem that the size of the message increases and a load is imposed on the communication network.

  By the way, in recent years, as a base station used in a wireless communication system, an extremely small base station having a cover area (cell radius) of about several tens of meters has begun to be used. A cell formed by such a small base station is called a “femto cell”, and its cell radius is generally smaller than a cell called a “macro cell” having a cell radius of about several kilometers to 10 km. A small base station provides a communication service such as a mobile phone to a mobile terminal located in a cell under its control by connecting to a mobile communication network via a communication network such as the Internet. Small base stations can be installed more easily and at a lower cost than conventional base stations, so it is expected to eliminate or reduce incommunicable areas such as mobile phones by installing them in buildings with poor radio wave conditions. .

  At present, the number of small base stations installed is said to be tens of thousands to hundreds of thousands, although it varies depending on the telecommunications carrier. Therefore, it is estimated that the number of mobile terminals located in cells under the control of a small base station will be more than that. Therefore, it has been attempted to distribute emergency information to such portable terminals (see, for example, Patent Document 2).

  FIG. 11 is a diagram illustrating an example of a schematic configuration of a distribution system 11 ′ targeted for femtocells.

  Each small base station 10 is assigned an IP (Internet Protocol) address in advance by a predetermined center device 8.

  When the distribution server 2 ′ receives an emergency earthquake warning message from an unillustrated organization such as the Japan Meteorological Agency, the distribution server 2 ′ creates a message text of the emergency earthquake warning. In addition, the distribution server 2 ′ specifies the small base station 10 and its subordinate cells, the center device 8 that houses the small base station 10, the small base station 10 that the center device 8 accommodates, etc. as the distribution area of the earthquake early warning. To do. The distribution server 2 ′ then sends a message including the list of cell IDs of each specified cell, the created message body, etc., with the IP address as the destination for each small base station 10 accommodated by the specified center device 8. It transmits to the specified center apparatus 8.

  The center apparatus 8 that has received the message transmits the received message to the destination small base station 10. Further, the small base station 10 that has received the message, if the cell ID of the cell under its control is included in the cell ID list included in the received message, each mobile terminal located in that cell 6 broadcasts the message body included in the received message.

  With such a configuration, the earthquake early warning can be distributed to a mobile terminal located in a specific femtocell. However, as described above, in addition to the increase in the size of the message, the message must be transmitted to each small base station 10, which increases the number of message transmissions and further increases the load on the communication network. is there.

JP 2012-147117 A JP 2010-199715 A

  The present invention has been made to solve such a conventional problem, and provides a distribution system and a distribution method capable of distributing emergency information without imposing an excessive load on a communication network. Objective.

  A distribution system according to the present invention is a distribution system including at least a distribution server that distributes a report, a relay server that relays the report, and a first base station and a second base station that broadcast the report. Each base station of the one base station and the second base station forms a first communication unit that communicates with a relay server, a second communication unit that performs wireless communication with a plurality of terminals, and the entire service area. A storage unit that stores area identification information that identifies an area to which each base station belongs, out of areas that are broadly divided from the cell, and a first processing unit, and the distribution server communicates with the relay server in a third A communication unit, and a second processing unit that transmits to the relay server a report including area identification information and distribution information of the distribution area of the report. The relay server communicates with the distribution server, a fourth communication unit, 1 base station and 2nd base station A fifth communication unit that performs communication; and a third processing unit that transmits the notification to the first base station and the second base station when the notification is received from the distribution server. When the first processing unit of each base station of the base station receives the notification from the relay server, the first processing unit reports the notification when the area identification information in the notification matches the area identification information in the storage unit of each base station. The broadcast distribution information is broadcast to a plurality of terminals located in subordinate cells.

  In the distribution system according to the present invention, the area identification information preferably identifies a predetermined administrative district.

  In the distribution system according to the present invention, the storage unit of each base station of the first base station and the second base station further stores all area identification information for identifying the entire service area, and the second processing unit of the distribution server Transmits a report including all area identification information and distribution information to the relay server when the report is distributed to the entire service area, and the first processing unit of each base station of the first base station and the second base station When a report is received from a relay server, when the area identification information in the report matches all area identification information in the storage unit of each base station, the distribution information in the report is stored in the subordinate cell. It is preferable to broadcast to a plurality of terminals in service.

  In the distribution system according to the present invention, the storage unit of each base station of the first base station and the second base station further stores address identification information for identifying the address of each base station. A second storage unit that stores address identification information of each base station of the base station and the second base station and all address identification information for identifying the entire address identification information, and the second processing unit of the distribution server is a relay server In the case where all the address identification information relating to, the area identification information of the distribution area of the notification, and the notification including the distribution information are transmitted to the relay server, and the third processing unit of the relay server receives the notification from the distribution server, When the address identification information in the report matches all the address identification information in the second storage unit of the relay server, the base station address identification information is reported for each base station of the first base station and the second base station. The address identification information in Replaced can, a report rewriting the address identification information, it is preferable to be transmitted to the base station.

  In the distribution system according to the present invention, it is preferable that the address identification information and the entire address identification information are IP addresses, and the all address identification information is a broadcast address.

  A distribution method according to the present invention is a distribution method in a distribution system including at least a distribution server that distributes a report, a relay server that relays the report, and a first base station and a second base station that broadcast the report. Thus, each base station of the first base station and the second base station has an area identification information for identifying an area to which each base station belongs among areas in which the entire service area is broadly divided from the cells formed by each base station. When the distribution server transmits a report including the area identification information of the distribution area of the report and the distribution information to the relay server, and the relay server receives the report from the distribution server, the notification Are transmitted to the first base station and the second base station, and each base station of the first base station and the second base station receives a report from the relay server, the area identification information and each base in the report When the area identification information in the storage unit matches the involves the distribution information in the notification to the broadcast transmission to the plurality of terminals located in the cell under.

  The distribution system and distribution method according to the present invention suppresses the size of emergency information notification by using area identification information instead of cell identification information, and further uses all address identification information instead of address identification information. It also reduces the number of notifications sent and allows the notifications to be distributed without overloading the communication network.

It is a figure which shows an example of schematic structure of a delivery system. It is a figure which shows an example of schematic structure of a delivery server. It is a figure which shows an example of schematic structure of a base station. It is a figure which shows an example of the operation | movement sequence of a delivery system. It is a figure which shows an example of schematic structure of the delivery system in 2nd Embodiment. It is a figure which shows an example of schematic structure of a delivery server. It is a figure which shows an example of schematic structure of a center apparatus. It is a figure which shows an example of schematic structure of a small base station. It is a figure which shows an example of the operation | movement sequence of a delivery system. It is a figure which shows an example of schematic structure of the delivery system by a CBS system. It is a figure which shows an example of schematic structure of the delivery system for femtocell.

  Hereinafter, various embodiments of the present invention will be described with reference to the drawings. However, it should be noted that the technical scope of the present invention is not limited to these embodiments, and extends to the invention described in the claims and equivalents thereof.

(First embodiment)
In the present embodiment, the entire service area is divided into areas wider than cells (for example, administrative divisions at levels such as prefectures, municipalities, etc.), and each base station 5 is classified into one of the areas. Each base station stores the area ID of the area to which it belongs instead of or in addition to the cell ID of the cell under its control. On the other hand, the distribution server designates the emergency information distribution area using the area ID instead of the conventional cell ID.

  In the following embodiments, an example in which an emergency earthquake bulletin is distributed as emergency information will be described, but the present invention is not limited to this. As emergency information, for example, information on various disasters such as information on tsunami prediction, typhoon warning, and information on fire may be distributed. Moreover, although CBS is assumed as a delivery system of emergency information, this invention is not limited to this. The delivery method is not limited as long as emergency information can be delivered, and may be, for example, ETWS (Earthquake and Tsunami Warning System), PWS (Public Warning Service), SMS (Short Message Service), or the like.

  FIG. 1 is a diagram illustrating an example of a schematic configuration of a distribution system 1.

  In the distribution system 1, exchanges (not shown) are connected to each other via a communication network 3 such as a core network. The exchange connects a wireless communication network covering a certain area to the communication network 3. In the wireless communication network, a plurality of base stations 5 are arranged so as to manage a wireless zone covering the area. Each base station 5 is connected to an exchange via an RNC 4 that accommodates itself. Then, when the mobile terminal 6 in a certain area communicates with other mobile terminals 6 in and out of the area, the mobile terminal 6 is connected to the RNC 4 via the base station 5 and further connected to the exchange, and Connected to the communication network 3.

  The communication network 3 is connected to a distribution server 2 that distributes earthquake early warnings. When the distribution server 2 receives an earthquake early warning message from an organization such as the Japan Meteorological Agency (not shown), the distribution server 2 identifies the emergency earthquake bulletin distribution area, and sends the earthquake early warning to the mobile terminal 6 located in the identified distribution area. It has a function to distribute.

  FIG. 2A is a diagram illustrating an example of a schematic configuration of the distribution server 2.

  The distribution server 2 specifies a distribution area of the earthquake early warning, creates and distributes the earthquake early warning, and the like. For this purpose, the distribution server 2 includes a communication unit 21, a storage unit 22, and a processing unit 23.

  The communication unit 21 includes a communication interface circuit for connecting the distribution server 2 to the communication network 3, and performs communication with the communication network 3. Then, the communication unit 21 supplies data received from the RNC 4, the base station 5, the mobile terminal 6, and the like to the processing unit 23. In addition, the communication unit 21 transmits the data supplied from the processing unit 23 to the RNC 4, the base station 5, the mobile terminal 6, and the like.

  The storage unit 22 includes, for example, at least one of a magnetic tape device, a magnetic disk device, and an optical disk device. The storage unit 22 stores an operating system program, a driver program, an application program, data, and the like used for processing in the processing unit 23. For example, the storage unit 22 stores, as an application program, an application program that distributes the earthquake early warning. In addition, the storage unit 22 includes, as data, a place name code indicating the correspondence between the place name code and the place name, a place name correspondence table, and a region code indicating the correspondence between the area code and the city / town / village identification code / city / town / town / town identification. A code correspondence table, a base station management table (FIG. 2B) for managing information related to the base station 5, and the like are stored. Furthermore, the storage unit 22 may temporarily store temporary data related to a predetermined process.

  FIG. 2B shows an example of the base station management table. In the base station management table, for each base station 5, the base station ID of the base station 5, the city identification code of the city where the base station 5 is located, the area ID of the area to which the base station 5 belongs, the base station RNCID of RNC 4 that accommodates 5 is included.

  The processing unit 23 includes one or a plurality of processors and their peripheral circuits. The processing unit 23 controls the overall operation of the distribution server 2 and is, for example, a CPU (Central Processing Unit). The processing unit 23 controls the operation of the communication unit 21 and the like so that various processes of the distribution server 2 are executed in an appropriate procedure according to a program stored in the storage unit 22. The processing unit 23 executes processing based on programs (operating system program, driver program, application program, etc.) stored in the storage unit 22. The processing unit 23 can execute a plurality of programs (such as application programs) in parallel.

  The processing unit 23 includes at least a distribution unit 231. Each of these units is a functional module implemented by a program executed on a processor included in the processing unit 23. Alternatively, each of these units may be implemented in the distribution server 2 as firmware.

  The distribution unit 231 identifies an emergency earthquake warning distribution area, creates and distributes an emergency earthquake warning, etc., upon receipt of an emergency earthquake warning message. That is, when an emergency earthquake warning message is received from an organization such as the Japan Meteorological Agency, the distribution unit 231 analyzes the received emergency earthquake warning message and identifies the epicenter name code and the area code. Further, the distribution unit 231 extracts a corresponding place name by referring to the place name code-place name correspondence table stored in the storage unit 22 using the identified epicenter place code as a key. And the delivery part 231 inserts the extracted place name into the message text of the earthquake early warning.

  Next, the distribution unit 231 uses the identified area code as a key to refer to the area code-city / town / village identification code correspondence table stored in the storage unit 22 and extracts a corresponding city / town / town / town identification code. Further, the distribution unit 231 refers to the base station management table stored in the storage unit 22 using the extracted municipality specific code as a key, and extracts the corresponding base station ID, area ID, and RNCID.

  Then, the distribution unit 231 creates a message including the extracted area ID list, the created message body, and the like, and transmits a copy to the RNC 4 corresponding to each extracted RNCID. A copy of the message transmitted to the RNC 4 is transmitted to each base station 5 accommodated by the RNC 4.

  FIG. 3 is a diagram illustrating an example of a schematic configuration of the base station 5.

  The base station 5 determines whether or not the earthquake early warning distribution belongs to the area, receives the earthquake early warning, and transmits the broadcast. For this purpose, the base station 5 includes a first communication unit 51, a second communication unit 52, a storage unit 53, and a processing unit 54.

  The first communication unit 51 includes a communication interface circuit for connecting the base station 5 to the RNC 4 and performs communication with the RNC 4. Then, the first communication unit 51 supplies the data received from the RNC 4 to the processing unit 54. In addition, the first communication unit 51 transmits the data supplied from the processing unit 54 to the RNC 4.

  The second communication unit 52 includes a communication interface circuit including an antenna whose sensitivity band is the 2.1 GHz band, and performs wireless communication with the mobile terminal 6. Then, the second communication unit 52 supplies the data received from the mobile terminal 6 to the processing unit 54. In addition, the second communication unit 52 transmits the data supplied from the processing unit 54 to the mobile terminal 6.

  The storage unit 53 includes, for example, at least one of a semiconductor memory, a magnetic disk device, and an optical disk device. The storage unit 53 stores an operating system program, a driver program, an application program, data, and the like used for processing in the processing unit 54. For example, the storage unit 53 stores, as an application program, an application program that receives and transmits an emergency earthquake warning. Further, the storage unit 53 stores, as data, its own base station ID, the cell ID of the subordinate cell, the area ID of the area to which it belongs, and the like. Furthermore, the storage unit 53 may temporarily store temporary data related to a predetermined process.

  The processing unit 54 includes one or a plurality of processors and their peripheral circuits. The processing unit 54 controls the overall operation of the base station 5 and is, for example, a CPU (Central Processing Unit). The processing unit 54 performs operations of the first communication unit 51, the second communication unit 52, and the like so that various processes of the base station 5 are executed in an appropriate procedure according to a program or the like stored in the storage unit 53. Control. The processing unit 54 executes processing based on programs (operating system program, driver program, application program, etc.) stored in the storage unit 53. The processing unit 54 can execute a plurality of programs (such as application programs) in parallel.

  The processing unit 54 includes at least a broadcast transmission unit 541. Each of these units is a functional module implemented by a program executed on a processor included in the processing unit 54. Alternatively, each of these units may be implemented in the base station 5 as firmware.

  The broadcast transmission unit 541 is triggered by the reception of the earthquake early warning, and determines whether or not the earthquake early warning is distributed to the distribution area, and transmits the earthquake early warning broadcast. That is, when the earthquake early warning is received from the RNC 4 via the first communication unit 51, the broadcast transmission unit 541 analyzes the message and specifies the area ID list and the message text. The broadcast transmission unit 541 determines whether or not the area ID stored in the storage unit 53 is included in the specified area ID list. When the area ID is included in the area ID list, the broadcast transmission unit 541 broadcasts the specified message body to each mobile terminal 6 located in the cell under its control. .

  FIG. 4 is a diagram illustrating an example of an operation sequence of the distribution system 1. Note that the operation sequence described below is based on the programs stored in the storage unit 22 and the storage unit 53 in advance, mainly by the processing unit 23 and the processing unit 54, in the distribution server 2, the RNC 4, and the base station 5. It is executed in cooperation with each element.

  The distribution unit 231 waits for reception of an emergency earthquake warning message.

  When the emergency earthquake warning message is received from an organization such as the Japan Meteorological Agency, the distribution unit 231 analyzes the received emergency earthquake warning message to identify the epicenter name code and the area code. In addition, the distribution unit 231 specifies a place name based on the specified epicenter place name code. And the delivery part 231 produces the message text of the earthquake early warning based on the specified place name (step S400).

  Next, the distribution unit 231 specifies a municipality specifying code based on the specified region code. In addition, the distribution unit 231 specifies the base station ID, the area ID, and the RNCID based on the specified city / town / village identification code (step S402). For example, if “1” to “3” are specified as the municipality specifying codes and the base station management table shown in FIG. 2B is referred to, “5a” to “5d” are set as the base station IDs. However, “7a” to “7c” are specified as the area ID, and “4a” and “4b” are specified as the RNCID.

  Then, the distribution unit 231 creates a message including the extracted area ID list, the created message body, and the like, and transmits a copy thereof to the RNC 4 corresponding to each extracted RNCID (steps S404 and S418). For example, if “7a” to “7c” are specified as the area ID and “4a” and “4b” are specified as the RNCID, a message {area ID = 7a to 7c, body text} is created, and a copy of the message is the RNCID “ 4a "and" 4b "are transmitted to the RNCs 4a and 4b.

  When the earthquake early warning is received from the distribution server 2, the RNC 4 transmits a copy of the message to each base station 5 accommodated therein (steps S406, S410, S414, S420, S424). For example, the RNC 4a transmits to the base stations 5a to 5c, and the RNC 4b transmits to the base stations 5d and 5e.

  When the earthquake early warning is received from the RNC 4 via the first communication unit 51, the broadcast transmission unit 541 analyzes the message and specifies the area ID list and the message text. The broadcast transmission unit 541 determines whether or not the area ID stored in the storage unit 53 is included in the specified area ID list. When the area ID is included in the area ID list, the broadcast transmission unit 541 broadcasts the specified message body to each mobile terminal 6 located in the cell under its control. (Steps S408, S412, S416, S422). For example, if area IDs “7a” to “7c” are included in the area ID list, each base station 5a to 5d storing these area IDs is located in the subordinate cell. The message body is broadcast to the portable terminal 6.

  As described above, by designating the area for emergency earthquake warning using the area ID instead of the conventional cell ID, the size of the emergency earthquake warning is reduced, and the communication network 3 is not overloaded. It is possible to deliver emergency earthquake bulletins.

  Note that the present invention is not limited to this embodiment. For example, in this embodiment, the entire service area is divided into areas wider than the cell, each base station 5 is classified into one of the areas, and the distribution area of the emergency earthquake bulletin is designated using the area ID of each area However, when a special area ID for identifying the entire service area is introduced, a special area ID is also stored in each base station 5, and an emergency earthquake bulletin is to be distributed to the entire service area, a special area ID is used. You may specify the distribution area. This makes it possible to further reduce the size of the earthquake early warning.

(Second Embodiment)
In the first embodiment, the present invention is applied to a conventional base station. However, the present invention can also be applied to a small base station. Therefore, in the present embodiment, the present invention is applied to a small base station. In this embodiment, the distribution server designates the destination of the earthquake early warning using the broadcast address of the network to which the small base station belongs instead of the IP address of the conventional small base station. On the other hand, when the center device receives the earthquake early warning addressed to a known broadcast address, the center device identifies a small base station belonging to the corresponding network, and rewrites the destination of the emergency earthquake early warning with the IP address of each small base station.

  FIG. 5 is a diagram illustrating an example of a schematic configuration of the distribution system 1 ′.

  In the distribution system 1 ′, exchanges (not shown) are connected to each other via a communication network 3 such as a core network. The exchange connects a wireless communication network covering a certain area to the communication network 3. In the wireless communication network, a plurality of small base stations 10 are arranged so as to manage a wireless zone covering the area. Each small base station 10 is connected to an exchange via a communication network 9 such as the Internet and a center device 8 that accommodates the small base station 10. And when the portable terminal 6 in a certain area communicates with other portable terminals 6 and the like inside and outside the area, the portable terminal 6 is connected to the center apparatus 8 via the small base station 10 and the communication network 9, Further, it is connected to the exchange and connected to the communication network 3.

  The communication network 3 is connected to a distribution server 2 ′ that distributes earthquake early warnings. When the distribution server 2 ′ receives an earthquake early warning message from an unillustrated organization such as the Japan Meteorological Agency, the distribution server 2 ′ identifies the emergency earthquake early warning delivery area, and sends the emergency earthquake early warning to the mobile terminal 6 located in the identified delivery area. It has a function to distribute.

  FIG. 6A is a diagram illustrating an example of a schematic configuration of the distribution server 2 ′.

  The distribution server 2 ′ identifies a distribution area of the emergency earthquake bulletin, creates and distributes the emergency earthquake bulletin, and the like. For this purpose, the distribution server 2 ′ includes a communication unit 21, a storage unit 22 ′, and a processing unit 23 ′. In addition, among these structures, since the communication part 21 is the same as what is shown by Fig.2 (a), description is abbreviate | omitted below.

  The storage unit 22 ′ includes, for example, at least one of a magnetic tape device, a magnetic disk device, and an optical disk device. The storage unit 22 ′ stores an operating system program, a driver program, an application program, data, and the like used for processing in the processing unit 23 ′. For example, the storage unit 22 ′ stores, as an application program, an application program that distributes an earthquake early warning. In addition, the storage unit 22 ′ includes, as data, a place name code-place name correspondence table indicating the correspondence between place name codes and place names, and a region code indicating the correspondence between area codes and city specific codes—city A specific code correspondence table, a small base station management table (FIG. 6 (b)) for managing information related to the small base station 10, a center apparatus management table (FIG. 6 (c)) for managing information related to the center apparatus 8, etc. Remember. Furthermore, the storage unit 22 ′ may temporarily store temporary data related to a predetermined process.

  FIG. 6B shows an example of a small base station management table. In the small base station management table, for each small base station 10, the base station ID of the small base station 10, the municipality identification code of the city where the small base station 10 is arranged, and the area to which the small base station 10 belongs. The area ID, the center device ID of the center device 8 that accommodates the small base station 10, and the like are included.

  FIG. 6C shows an example of the center device management table. The center device management table includes, for each center device 8, the center device ID of the center device 8, the broadcast address of the network to which the small base station 10 accommodated by the center device 8 belongs, and the like.

  The processing unit 23 'includes one or a plurality of processors and their peripheral circuits. The processing unit 23 ′ controls the overall operation of the distribution server 2 ′, and is, for example, a CPU (Central Processing Unit). The processing unit 23 ′ controls the operation of the communication unit 21 and the like so that various processes of the distribution server 2 ′ are executed in an appropriate procedure according to a program stored in the storage unit 22 ′. The processing unit 23 'executes processing based on programs (operating system program, driver program, application program, etc.) stored in the storage unit 22'. Further, the processing unit 23 ′ can execute a plurality of programs (such as application programs) in parallel.

  The processing unit 23 ′ includes at least a distribution unit 231 ′. Each of these units is a functional module implemented by a program executed on a processor included in the processing unit 23 '. Alternatively, each of these units may be mounted on the distribution server 2 'as firmware.

  The distribution unit 231 'triggers the reception of the earthquake early warning message, identifies the distribution area of the earthquake early warning, creates and distributes the earthquake early warning, and the like. That is, when an emergency earthquake warning message is received from an organization such as the Japan Meteorological Agency, the distribution unit 231 ′ analyzes the received earthquake early warning message and identifies the epicenter name code and the area code. In addition, the distribution unit 231 ′ refers to the place name code-place name correspondence table stored in the storage unit 22 ′ using the identified epicenter place code as a key, and extracts a corresponding place name. Then, the distribution unit 231 'inserts the extracted place name into the message text of the earthquake early warning.

  Next, the distribution unit 231 ′ uses the identified region code as a key to refer to the region code-city / town / village identification code correspondence table stored in the storage unit 22 ′ and extracts the corresponding city / town / town / region identification code. . Also, the distribution unit 231 ′ refers to the small base station management table stored in the storage unit 22 ′ using the extracted city / town / town identification code as a key, and corresponds to the small base station ID, area ID, and center device. Extract the ID. Further, the distribution unit 231 ′ refers to the center device management table stored in the storage unit 22 ′ using the extracted center device ID as a key, and extracts a corresponding broadcast address.

  Then, the distribution unit 231 ′ creates a message including a list of extracted area IDs, a created message body, etc. for each extracted center device ID as a destination, and responds via the communication unit 21. To the center device 8 to be transmitted.

  FIG. 7A is a diagram illustrating an example of a schematic configuration of the center device 8.

  The center device 8 relays and distributes the earthquake early warning, manages the IP address, and the like. For this purpose, the center device 8 includes a first communication unit 81, a second communication unit 82, a storage unit 83, and a processing unit 84.

  The first communication unit 81 includes a communication interface circuit for connecting the center device 8 to the communication network 3 and performs communication with the communication network 3. Then, the first communication unit 81 supplies data received from the distribution server 2 ′ or the like to the processing unit 84. In addition, the first communication unit 81 transmits the data supplied from the processing unit 84 to the distribution server 2 ′ and the like.

  The second communication unit 82 includes a communication interface circuit for connecting the center device 8 to the communication network 9, and performs communication with the communication network 9. Then, the second communication unit 82 supplies data received from the mobile terminal 6, the small base station 10, and the like to the processing unit 84. The second communication unit 82 transmits the data supplied from the processing unit 84 to the mobile terminal 6, the small base station 10, and the like.

  The storage unit 83 includes, for example, at least one of a magnetic tape device, a magnetic disk device, and an optical disk device. The storage unit 83 stores an operating system program, a driver program, an application program, data, and the like used for processing in the processing unit 84. For example, the storage unit 83 stores, as application programs, an application program that relays and distributes the earthquake early warning, an application program that manages IP addresses, and the like. In addition, the storage unit 83 stores, as data, a broadcast address of a network managed by itself, an IP address management table (FIG. 7B) that manages the use status of IP addresses belonging to the network, and the like. Furthermore, the storage unit 83 may temporarily store temporary data related to a predetermined process.

  FIG. 7B shows an example of the IP address management table. The IP address management table includes, for each IP address, the usage status (in use / unused) of the IP address, the small base station ID of the small base station 10 to which the IP address is assigned, and the like.

  The processing unit 84 includes one or a plurality of processors and their peripheral circuits. The processing unit 84 controls the overall operation of the center apparatus 8 in an integrated manner, and is, for example, a CPU (Central Processing Unit). The processing unit 84 performs operations of the first communication unit 81, the second communication unit 82, and the like so that various processes of the center device 8 are executed in an appropriate procedure according to a program stored in the storage unit 83. Control. The processing unit 84 executes processing based on programs (operating system program, driver program, application program, etc.) stored in the storage unit 83. The processing unit 84 can execute a plurality of programs (such as application programs) in parallel.

  The processing unit 84 includes a relay unit 841 and an IP address management unit 842. Each of these units is a functional module implemented by a program executed on a processor included in the processing unit 84. Alternatively, these units may be mounted on the center device 8 as firmware.

  The relay unit 841 relays and distributes the emergency earthquake bulletin when triggered by the reception of the earthquake early warning. That is, when the earthquake early warning is received from the distribution server 2 ′ via the first communication unit 81, the relay unit 841 analyzes the message and identifies the destination IP address. Further, the relay unit 841 determines whether or not the identified IP address matches the broadcast address stored in the storage unit 83. When the IP address matches the broadcast address, the relay unit 841 refers to the IP address management table stored in the storage unit 83 and extracts the IP address of the small base station 10 belonging to the corresponding network. . For each extracted IP address, the relay unit 841 rewrites the destination with the IP address, and transmits the received message to the corresponding small base station 10 via the second communication unit 82.

  The IP address management unit 842 performs IP address management (assignment, etc.) triggered by reception of an IP address assignment request or the like. That is, when an IP address assignment request is received from the small base station 10 via the second communication unit, the IP address management unit 842 analyzes the received IP address assignment request and analyzes the small base station of the small base station 10. Specify the ID. Further, the IP address management unit 842 refers to the IP address management table stored in the storage unit 83 and identifies one IP address whose usage status is “unused”. Then, the IP address management unit 842 changes the usage status of the identified IP address to “in use”, stores the identified small base station ID in association with the IP address allocation response including the IP address, It transmits to the small base station 10 via a 2nd communication part.

  Note that DHCP (Dynamic Host Configuration Protocol) is assumed as a communication protocol related to IP address assignment, but the present invention is not limited to this. The communication protocol only needs to be able to assign an IP address, and may be another communication protocol.

  FIG. 8 is a diagram illustrating an example of a schematic configuration of the small base station 10.

  The small base station 10 determines whether or not the earthquake early warning distribution belongs to the area, receives the earthquake early warning, and transmits the broadcast. For this purpose, the small base station 10 includes a first communication unit 101, a second communication unit 102, a storage unit 103, and a processing unit 104.

  The first communication unit 101 includes a communication interface circuit for connecting the small base station 10 to the communication network 9, and performs communication with the communication network 9. Then, the first communication unit 101 supplies data received from the distribution server 2 ′, the center device 8, and the like to the processing unit 104. The first communication unit 101 transmits the data supplied from the processing unit 104 to the distribution server 2 ′, the center device 8, and the like.

  The second communication unit 102 includes a communication interface circuit including an antenna whose sensitivity band is 2.1 GHz band, and performs wireless communication with the mobile terminal 6. Then, the second communication unit 102 supplies the data received from the mobile terminal 6 to the processing unit 104. In addition, the second communication unit 102 transmits the data supplied from the processing unit 104 to the mobile terminal 6.

  The storage unit 103 includes, for example, at least one of a semiconductor memory, a magnetic disk device, and an optical disk device. The storage unit 103 stores an operating system program, a driver program, an application program, data, and the like used for processing in the processing unit 104. For example, the storage unit 103 stores, as application programs, an application program that receives and transmits an earthquake early warning, an application program that makes an IP address management request, and the like. In addition, the storage unit 103 stores, as data, its own small base station ID, the cell ID of the subordinate cell, the area ID of the area to which it belongs, its own IP address, and the like. Furthermore, the storage unit 103 may temporarily store temporary data related to a predetermined process.

  The processing unit 104 includes one or a plurality of processors and their peripheral circuits. The processing unit 104 comprehensively controls the overall operation of the small base station 10 and is, for example, a CPU (Central Processing Unit). The processing unit 104 operates the first communication unit 101, the second communication unit 102, and the like so that various processes of the small base station 10 are executed in an appropriate procedure according to a program stored in the storage unit 103. To control. The processing unit 104 executes processing based on programs (operating system program, driver program, application program, etc.) stored in the storage unit 103. The processing unit 104 can execute a plurality of programs (such as application programs) in parallel.

  The processing unit 104 includes at least a broadcast transmission unit 1041 and an IP address setting unit 1042. Each of these units is a functional module implemented by a program executed on a processor included in the processing unit 104. Alternatively, each of these units may be implemented in the small base station 10 as firmware.

  The broadcast transmission unit 1041 makes a decision on whether or not to belong to the distribution area of the earthquake early warning, broadcast transmission of the earthquake early warning, etc., when receiving the earthquake early warning. That is, when the earthquake early warning is received from the center device 8 via the first communication unit 101, the broadcast transmission unit 1041 analyzes the message and specifies the area ID list and the message text. Further, the broadcast transmission unit 1041 determines whether or not the area ID stored in the storage unit 103 is included in the specified area ID list. When the area ID is included in the area ID list, the broadcast transmission unit 1041 broadcasts the specified message body to each mobile terminal 6 located in the cell under its control. .

  The IP address setting unit 1042 sets an IP address in response to connection to the communication network 9 or the like. That is, when connection to the communication network 9 or the like is detected, the IP address setting unit 1042 acquires its own small base station ID from the storage unit 103. Then, the IP address setting unit 1042 transmits an IP address allocation request including the acquired small base station ID to the center device 8 via the first communication unit 101. On the other hand, when an IP address assignment response is received from the center device 8 via the first communication unit 101, the IP address setting unit 1042 analyzes the received IP address assignment response and identifies an IP address. The IP address setting unit 1042 stores the specified IP address in the storage unit 103 and performs settings related to network connection so that communication is performed using the IP address.

  FIG. 9 is a diagram illustrating an example of an operation sequence of the distribution system 1 ′. The operation sequence described below is mainly performed by the processing unit 23 ′, the processing unit 84, and the processing unit 104 based on programs stored in the storage unit 22 ′, the storage unit 83, and the storage unit 103 in advance. This is executed in cooperation with each element of the distribution server 2 ′, the center device 8, and the small base station 10.

  The distribution unit 231 ′ waits for reception of an emergency earthquake warning message.

  When an emergency earthquake warning message is received from an organization such as the Japan Meteorological Agency, the distribution unit 231 'analyzes the received emergency earthquake warning message to identify the epicenter name code and the area code. Further, the distribution unit 231 ′ specifies a place name based on the specified epicenter place name code. Then, the distribution unit 231 ′ creates a message text of the earthquake early warning based on the specified place name (step S <b> 900).

  Next, the distribution unit 231 ′ specifies a city / town / village identification code based on the identified area code. In addition, the distribution unit 231 'specifies the small base station ID, the area ID, and the center device ID based on the specified city / town / village identification code (step S902). Further, the distribution unit 231 'specifies a broadcast address based on the specified center device ID (step S904). For example, if “1” to “3” are specified as the municipality specifying codes, and the small base station management table shown in FIG. 6B is referred to, “10a” to “10” are set as the small base station IDs. “10d” is specified as area IDs “7a” to “7c”, and “8a” and “8b” are specified as center device IDs. Furthermore, if the center device management table shown in FIG. 6C is referred to, “10.0.0.255” and “10.0.1.255” are specified as broadcast addresses.

  Then, the distribution unit 231 ′ creates a message including a list of extracted area IDs, a created message body, etc. for each extracted center device ID as a destination, and responds via the communication unit 21. Is transmitted to the center device 8 (steps S906 and S920). For example, “7a” to “7c” are the area IDs, “8a” and “8b” are the center device IDs, and “10.0.0.255” and “10.0.1.255” are the broadcast addresses. If specified, message 1 {destination = 10.0.0.255, area ID = 7a-7c, text}, message 2 {destination = 10.0.1.255, area ID = 7a-7c, text} Is created. Then, the message 1 is transmitted to the center device 8a corresponding to the center device ID “8a”, and the message 2 is transmitted to the center device 8b corresponding to the center device ID “8b”.

  When the earthquake early warning is received from the distribution server 2 ′ via the first communication unit 81, the relay unit 841 analyzes the message and identifies the destination IP address. Further, the relay unit 841 determines whether or not the identified IP address matches the broadcast address stored in the storage unit 83. When the IP address matches the broadcast address, the relay unit 841 specifies the IP address of the small base station 10 belonging to the corresponding network. For each identified IP address, the relay unit 841 rewrites the destination with the IP address, and transmits the received message to the corresponding small base station 10 via the second communication unit 82 (steps S908 and S912). , S916, S922, S926). For example, it is assumed that the message {destination = 10.0.0.255, area ID = 7a-7c, body text} is received in the center apparatus 8a, and the IP address management table shown in FIG. Then, “10.0.0.1”, “10.0.0.2”, “10.0.0.3” are specified as IP addresses, and message 1 {destination = 10.0.0.1 , Area ID = 7a-7c, text}, message 2 {destination = 10.0.0.2, area ID = 7a-7c, text}, message 3 {destination = 10.0.0.3, area ID = 7a-7c, text} are created. Then, message 1 is sent to the small base station 10a corresponding to the IP address “10.0.0.1”, and message 2 is sent to the small base station 10b corresponding to the IP address “10.0.0.2”. Are transmitted to the small base station 10c corresponding to the IP address “10.0.0.3”.

  When the earthquake early warning is received from the center device 8 via the first communication unit 101, the broadcast transmission unit 1041 analyzes the message and specifies the area ID list and the message text. Further, the broadcast transmission unit 1041 determines whether or not the area ID stored in the storage unit 103 is included in the specified area ID list. When the area ID is included in the area ID list, the broadcast transmission unit 1041 broadcasts the specified message body to each mobile terminal 6 located in the cell under its control. (Steps S910, S914, S918, S924). For example, if area IDs “7a” to “7c” are included in the area ID list, the small base stations 10a to 10d storing these area IDs are present in the subordinate cells. The message body is broadcast to each portable terminal 6.

  As described above, instead of the IP address of the conventional small base station, the number of emergency earthquake bulletin transmissions can be reduced by specifying the destination of the earthquake early warning using the broadcast address of the network to which the small base station belongs. The earthquake early warning can be distributed without imposing an excessive load on the communication network 3.

  Note that the present invention is not limited to this embodiment. For example, in the present embodiment, each center device 8 manages one network (broadcast address), but may manage a plurality of networks. As a result, the number of center devices 8 can be reduced, and operation costs and the like can be reduced.

  A computer program for causing a computer to realize the functions of the processing units 23 and 23 ', the processing unit 54, the processing unit 84, and the processing unit 104 is readable by a computer such as a magnetic recording medium or an optical recording medium. You may provide in the form recorded on the recording medium.

  It should be understood by those skilled in the art that various changes, substitutions and modifications can be made thereto without departing from the spirit and scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Distribution system 2, 2 'Distribution server 21 Communication part 22, 22' Memory | storage part 23, 23 'Processing part 231, 231' Distribution part 3, 9 Communication network 4 RNC
DESCRIPTION OF SYMBOLS 5 Base station 51 1st communication part 52 2nd communication part 53 Memory | storage part 54 Processing part 541 Broadcast transmission part 6 Portable terminal 7 Area 8 Center apparatus 81 1st communication part 82 2nd communication part 83 Storage part 84 Processing part 841 Relay Unit 842 IP address management unit 10 small base station 101 first communication unit 102 second communication unit 103 storage unit 104 processing unit 1041 broadcast transmission unit 1042 IP address setting unit

Claims (4)

A distribution system comprising at least a distribution server that distributes a report, a relay server that relays the report, and a first base station and a second base station that broadcast the report,
Each base station of the first base station and the second base station is
A first communication unit that communicates with the relay server;
A second communication unit that performs wireless communication with a plurality of terminals;
Area identification information for identifying an area to which each base station belongs , and an IP address for identifying the address of each base station, in an area where the entire service area is divided more widely than the cell formed by each base station. A first storage unit for storing;
A first processing unit,
The distribution server
A third communication unit that communicates with the relay server;
Based on the earthquake information received from the outside, identifies the epicenter name and area, generates distribution information including the identified epicenter name, and uses the identified area as the report distribution area, area identification information of the report distribution area A generating unit for generating
A second processing unit for transmitting the notification including area identification information of the distribution area of the notification and the distribution information to the relay server;
The relay server is
A fourth communication unit that communicates with the distribution server;
A fifth communication unit for communicating with the first base station and the second base station;
A second storage unit that stores an IP address of each base station of the first base station and the second base station and a broadcast address in the network under the relay server for identifying the entire IP address;
A third processing unit that, when receiving the notification from the distribution server, transmits the notification to the first base station and the second base station;
The second processing unit of the distribution server sends a third report including destination identification information in which the broadcast address related to the relay server is set, area identification information of the distribution area of the report, and the distribution information, To the relay server,
When the third processing unit of the relay server receives the third notification from the distribution server, the third processing unit of the relay server adds the broadcast in the second storage unit of the relay server to the destination identification information in the third notification. When the address is set, for each of the base stations of the first base station and the second base station, rewrite the destination identification information in the third report with the IP address of the base station, Transmitting the third report in which the destination identification information is rewritten to each base station;
Wherein said first processing unit of each base station of the first base station and the second base station, when receiving the notification or the third notification from the relay server, the notification or the third notification When the area identification information in the base station matches the area identification information in the first storage unit of each base station, the distribution information in the notification or the third notification is located in a subordinate cell. Broadcast to multiple connected devices,
A distribution system characterized by that.   The distribution system according to claim 1, wherein the area identification information identifies a predetermined administrative division. The first storage unit of each base station of the first base station and the second base station further stores all area identification information for identifying the entire service area,
When the second processing unit of the distribution server reports to the entire service area, the second processing unit transmits a second report including all area identification information and distribution information to the relay server,
When the first processing unit of each base station of the first base station and the second base station receives the second report from the relay server, the all-area identification information in the second report When the all-area identification information in the storage unit of each base station matches, the distribution information in the second notification is broadcast to a plurality of terminals located in subordinate cells The delivery system according to claim 1 or 2. A distribution method in a distribution system comprising at least a distribution server that distributes a report, a relay server that relays the report, and a first base station and a second base station that broadcast the report,
Each of the base stations of the first base station and the second base station identifies an area to which the base station belongs, out of areas in which the entire service area is broadly divided from the cells formed by the base stations. A first storage unit for storing identification information and an IP address for identifying an address of each base station ;
The relay server stores the IP address of each base station of the first base station and the second base station and a broadcast address in the network under the relay server for identifying the entire IP address. A storage unit,
The distribution server identifies an epicenter name and area based on earthquake information received from outside, generates distribution information including the identified epicenter name, and distributes the report using the identified area as a report distribution area. Generate area identification information for the area,
The distribution server transmits the notification including the area identification information of the distribution area of the notification and the distribution information to the relay server,
When the relay server receives the notification from the distribution server, the notification is transmitted to the first base station and the second base station,
The distribution server transmits destination identification information in which the broadcast address related to the relay server is set, area identification information of the distribution area of the notification, and a third report including the distribution information to the relay server,
When the relay server receives the third notification from the distribution server, the broadcast address in the second storage unit of the relay server is set in the destination identification information in the third notification. Sometimes, for each base station of the first base station and the second base station, the destination identification information in the third notification is rewritten with the IP address of the base station, and the destination identification information is rewritten. Sending the third report to each base station;
The first base station and each base station of said second base station, when receiving the notification or the third notification from the relay server, the area identification information of the report or the third in the notification And when the area identification information in the first storage unit of each base station matches, a plurality of terminals that are present in the subordinate cell of the distribution information in the notification or the third notification Broadcast to
A distribution method characterized by including:

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