JP2013046366A - Emergency prompt report distribution system, mobile communication server device and emergency prompt report distribution method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To distribute an emergency prompt report to a mobile terminal in communication, without imposing an excessive load upon a core network.SOLUTION: By reference to a user list table 201 of an emergency prompt report notification target, it is determined whether an emergency prompt report distribution area is included in an emergency prompt report target area included in a received emergency prompt report. If the emergency prompt report distribution area is included, the emergency prompt report is transmitted to a mobile terminal address associated with the area. The transmitted emergency prompt report is received by a reception unit of a mobile communication server device. By reference to a preservation state table 211, it is determined whether a communication channel to the mobile terminal address, the destination of the received emergency prompt report, is in a preserved state. If the channel is in the preserved state, the emergency prompt report is discarded, whereas otherwise, the emergency prompt report is transmitted to the mobile terminal. By this, it is possible to distribute an emergency prompt report also to a mobile terminal in communication through an individual CH.

Description

  The present invention relates to an emergency bulletin distribution system, a mobile communication server device, and an emergency bulletin distribution method, and more particularly, to an emergency bulletin distribution system, a mobile communication server device, and an emergency bulletin distribution method for distributing emergency bulletins to mobile terminals.

  From October 1, 2007, the Japan Meteorological Agency has started emergency earthquake bulletins for the general public (television / radio, disaster prevention administrative radio, in-house broadcasting at customer facilities). Moreover, the mobile communication operator distributes the earthquake early warning to the mobile terminal (for example, Non-Patent Document 1). In addition, there is a request from local governments to distribute information to the majority in the event of an emergency such as a disaster, and information on terrorism, warnings, and large-scale accidents must be immediately distributed to many users.

  However, in the current delivery system (such as e-mail) to mobile terminals, immediate delivery to the majority of users is impossible from the viewpoint of radio resources, and a broadcast system is required to satisfy the requirements. Cell broadcast (CBS) standardized by 3GPP (Third Generation Partnership Project) is a platform for realizing the broadcast system in the third generation mobile communication system network. Mobile communication operators adopting the 3GPP standard distribute earthquake early warnings using a broadcast system using CBS.

  However, when performing broadcast delivery of emergency bulletins to the majority of mobile terminals using the CBS platform, users in communication cannot receive emergency bulletins. The mobile terminal uses an individual channel (hereinafter abbreviated as individual CH) during packet communication, and can simultaneously receive a common channel (hereinafter abbreviated as common CH) to which Paging and CBS Message are distributed. It is not possible. This point is also described in Patent Document 1.

JP 2010-11190 A

NTT DOCOMO, INC. "Emergency Bulletin" Area Mail "" [online], [Search August 11, 2011], Internet <URL: http://www.nttdocomo.co.jp/service/safety/areamail/index .html>

  By the way, since the 2011 off the Pacific coast of Tohoku Earthquake occurred, the need to deliver emergency bulletins to mobile terminals in packet communication is increasing. Here, for mobile terminals in packet communication that cannot receive emergency bulletin, a message by SMS (Short Message Service) is created in a mobile communication core network device such as SGSN (Serving GPRS Support Node) It is conceivable as a method to notify an emergency bulletin using a bearer (communication channel). However, when processing for extracting mobile terminals in communication with SGSN and processing for creating a large amount of SMS messages with SGSN, the load on SGSN and processing time may be enormous. Therefore, in such a case, it is not realistic to apply to urgent communication such as emergency bulletin.

For this reason, it is desired to realize a method for delivering emergency bulletins to mobile terminals that are unable to receive emergency bulletins by CBS and that do not place an excessive load on the mobile communication core network.
The present invention has been made to solve the above-described problems of the background art, and an object of the present invention is to provide an early warning to a mobile terminal in packet communication without imposing an excessive load on the core network of mobile communication. Is provided, an emergency early warning delivery system, a mobile communication server device, and an emergency early warning delivery method.

The emergency bulletin distribution system according to one aspect of the present invention is a first table (for example, an emergency bulletin notification target user list table 201 in FIG. 2) that holds an address of a mobile terminal and the emergency bulletin distribution area of the mobile terminal in association with each other. ), A receiving unit (for example, the receiving unit 203 in FIG. 2) that receives an emergency early warning including the area for the emergency early warning and the contents of the emergency, and the emergency received by the receiving unit with reference to the first table. A delivery area management unit (for example, the delivery area management unit in FIG. 2) that determines whether the emergency bulletin target area included in the bulletin includes the emergency bulletin delivery area held in the first table. 202), and if the emergency early warning delivery area is included in the emergency early warning target area as a result of the determination by the delivery area management unit, the emergency early warning delivery area is associated with the emergency early warning delivery area. An emergency bulletin notification server device (for example, the emergency bulletin notification server device in FIG. 1) provided with a transmission unit (for example, the transmission unit 204 in FIG. 2) that transmits the emergency bulletin toward the address of the mobile terminal 20)
A second table (for example, a reservation state table 211 in FIG. 3) that holds the address of the mobile terminal and reservation state information indicating whether the communication path to the mobile terminal is in a reservation state; A receiving unit (for example, the receiving unit 213 in FIG. 3) that receives the emergency breaking news transmitted by the emergency breaking news notification server device, and the second table, and refers to the emergency breaking news received by the receiving unit. A reservation state management unit (for example, the reservation state management unit 212 in FIG. 3) that determines whether the communication path to the mobile terminal of the destination address is in the preservation state, and the determination of the reservation state management unit As a result, if the communication path to the mobile terminal is in a preservation state, the emergency bulletin must be discarded and the communication state must be in the preservation state. Transmission unit to be transmitted to the emergency bulletin to the mobile terminal (for example, the transmission unit 214 in FIG. 3) the mobile communication server apparatus and a (e.g., GGSN 21 in FIG. 1),
It is characterized by including. According to this emergency bulletin distribution system, emergency bulletins can be distributed to mobile terminals in communication via individual CHs instead of common CHs.

  Further, it may further include a broadcast distribution server device that broadcasts an emergency bulletin including an emergency bulletin target area and emergency contents. According to this emergency bulletin distribution system, an emergency bulletin can be distributed to a mobile terminal in communication that cannot receive the emergency bulletin by CBS without imposing an excessive load on the core network of mobile communication.

  Further, when the preservation state management unit of the mobile communication server apparatus acquires the preservation state information about the communication path to the mobile terminal, the preservation state information held in the second table is displayed. The address that is the destination of the emergency bulletin received by the receiving unit of the mobile communication server device is the same as the address held in the second table, and the communication path to the mobile terminal is If it is in the reservation state, the emergency bulletin may be discarded. According to this emergency bulletin distribution system, an emergency bulletin can be distributed to a mobile terminal whose communication path is in a preservation state via a common CH.

  The reservation state management unit of the mobile communication server device rewrites the reservation state information held in the second table when acquiring the reservation state information about the communication path to the mobile terminal, If the emergency bulletin received by the receiving unit of the mobile communication server device includes a flag indicating that it is emergency bulletin, and the communication path to the mobile terminal is in a preservation state, the emergency bulletin May be discarded. According to this emergency bulletin distribution system, an emergency bulletin can be distributed to a mobile terminal whose communication path is in a preservation state via a common CH.

A mobile communication server apparatus according to an aspect of the present invention is a mobile communication server apparatus used in an emergency bulletin distribution system that transmits an emergency bulletin toward an address of a mobile terminal associated with an emergency bulletin distribution area (for example, FIG. 1) GGSN21)
A second table (for example, a reservation state table 211 in FIG. 3) that holds the address of the mobile terminal and reservation state information indicating whether the communication path to the mobile terminal is in a reservation state; A reception unit that receives the emergency bulletin transmitted by the emergency bulletin notification server device, and a communication path to the mobile terminal of the address that is the destination of the emergency bulletin received by the reception unit with reference to the second table If the communication path to the mobile terminal is in the preservation state as a result of the determination by the preservation state management unit that determines whether or not the preservation state, the emergency early warning is discarded If it is not in a state, it includes a transmitting unit that transmits the emergency bulletin to the mobile terminal. If this mobile communication server device is used in an emergency bulletin distribution system, an emergency bulletin can be distributed to a mobile terminal in communication via an individual CH instead of a common CH.

  When the reservation state management unit acquires the preservation state information about the communication path to the mobile terminal, the reservation state management unit rewrites the reservation state information held in the second table, and the reception unit receives If the address that is the destination of the emergency bulletin coincides with the address held in the second table, and the communication path to the mobile terminal is in a preservation state, the emergency bulletin is discarded. Also good. In this way, the emergency bulletin can be distributed to the mobile terminal whose communication path is in the preservation state via the common CH.

  When the reservation state management unit acquires the preservation state information about the communication path to the mobile terminal, the reservation state management unit rewrites the reservation state information held in the second table, and the reception unit receives If the emergency bulletin includes a flag indicating that it is an emergency bulletin and the communication path to the mobile terminal is in a preservation state, the emergency bulletin may be discarded. In this way, the emergency bulletin can be distributed to the mobile terminal whose communication path is in the preservation state via the common CH.

The emergency bulletin distribution method according to one aspect of the present invention is a first table (for example, an emergency bulletin notification target user list table 201 in FIG. 2) that holds an address of a mobile terminal and an emergency bulletin distribution area of the mobile terminal in association with each other. ), A receiving unit (for example, the receiving unit 203 in FIG. 2) that receives an emergency early warning including the area for the emergency early warning and the contents of the emergency, and the emergency received by the receiving unit with reference to the first table. A delivery area management unit (for example, the delivery area management unit in FIG. 2) that determines whether the emergency bulletin target area included in the bulletin includes the emergency bulletin delivery area held in the first table. 202), if the emergency early warning distribution area is included in the emergency early warning target area as a result of the determination by the delivery area management unit, it is associated with the emergency early warning delivery area. Towards the address of the mobile terminal has, transmitting unit transmitting the emergency bulletin (e.g., transmission portion 204 in FIG. 2) and the early warning notification server device provided with,
A second table (for example, a reservation state table 211 in FIG. 3) that holds the address of the mobile terminal and reservation state information indicating whether the communication path to the mobile terminal is in a reservation state; A receiving unit (for example, the receiving unit 213 in FIG. 3) that receives the emergency breaking news transmitted by the emergency breaking news notification server device, and the second table, the emergency warning received by the receiving unit A reservation state management unit (for example, the reservation state management unit 212 in FIG. 3) that determines whether the communication path to the mobile terminal of the destination address is in the preservation state, and the determination of the reservation state management unit As a result, if the communication path to the mobile terminal is in a preservation state, the emergency bulletin must be discarded and the communication state must be in the preservation state. Transmission unit to be transmitted to the emergency bulletin to the mobile terminal (e.g., transmission portion 214 in FIG. 3) and a mobile communication server apparatus equipped with,
An emergency breaking news delivery method realized by an emergency breaking news delivery system including
A first step in which the receiving unit of the emergency bulletin notification server device receives an emergency bulletin including an emergency bulletin target area and emergency contents, and the emergency bulletin received in the first step with reference to the first table. A second step in which the distribution area management unit determines whether the emergency early warning target area included in the emergency early warning target area included in the first table is included; and the second step in the second step As a result of the determination by the distribution area management unit, when the emergency breaking news distribution area is included in the emergency breaking news target area, the emergency breaking news is transmitted to the address of the mobile terminal associated with the emergency breaking news distribution area. A third step and a fourth step in which the receiver of the mobile communication server device receives the emergency bulletin transmitted by the emergency bulletin notification server device. And the reservation state management unit determines whether the communication path to the mobile terminal of the address which is the destination of the emergency bulletin received in the fourth step is in a reservation state with reference to the second table. If the communication path to the mobile terminal is in the preservation state as a result of the determination in the fifth step and the reservation state management unit, the emergency bulletin is discarded, and if the communication path to the mobile terminal is not in the preservation state, the emergency bulletin is transmitted to the mobile terminal. And a sixth step of transmitting to the mobile phone. According to this emergency bulletin distribution method, the emergency bulletin can be distributed to mobile terminals in communication via the individual CH instead of the common CH.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to deliver an emergency bulletin to the mobile terminal in communication which cannot receive emergency bulletin by CBS, without applying excessive load to the core network of mobile communication. Thereby, it is possible to support the user to take the primary evacuation action earlier, and to reduce the influence on human life due to an emergency such as a disaster.

It is a conceptual diagram which shows the structural example of the emergency early warning delivery system by embodiment of this invention. It is a figure which shows the function structural example of the emergency early warning server apparatus in FIG. It is a figure which shows the function structural example of GGSN in FIG. It is a figure which shows the process of an emergency bulletin notification server apparatus and GGSN. It is a sequence diagram which shows the operation | movement of this system in case the communication path to a mobile terminal is a preservation state. It is a sequence diagram which shows operation | movement of this system in case the communication path to a mobile terminal is not a preservation state. (A) is a figure which shows the case where a flag is set to the header part of a packet, (B) is a figure which shows the case where a flag is set to the body part of a packet. It is a flowchart for demonstrating the emergency breaking news delivery method by embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings referred to in the following description, the same parts as those in the other drawings are denoted by the same reference numerals.
(Emergency breaking news distribution system)
FIG. 1 is a conceptual diagram showing a configuration example of an emergency breaking news distribution system according to an embodiment of the present invention. Referring to FIG. 1, the emergency bulletin distribution system of the present example includes an emergency bulletin distribution server device 1 that acquires emergency bulletins from a server device of the Japan Meteorological Agency, and an emergency bulletin acquired by the emergency bulletin distribution server device 1 via a common CH. A cell broadcast system 100 that distributes the information, and an individual packet distribution unicast system 200 that distributes the emergency bulletins acquired by the emergency bulletin distribution server device 1 via individual CHs.

  The cell broadcast system 100 has a function of delivering emergency bulletins to mobile terminals that are not communicating (that is, mobile terminals that are not communicating). In order to realize this function, the cell broadcast system 100 corresponds to the CBS server device 10 that performs cell broadcast distribution of the emergency bulletin acquired by the emergency bulletin distribution server device 1 to the non-communication mobile terminal, and the distribution area. The wireless base station 11 is provided.

  As shown in FIG. 1, when the mobile terminals 2a, 2b and 2c are located in the distribution area and the mobile terminal 2d is located outside the distribution area, the mobile terminals 2a and 2b located in the distribution area. 2c can receive the emergency bulletin, and the mobile terminal 2d located outside the distribution area cannot receive the emergency bulletin. The mobile terminals 2a, 2b, and 2c that have received the emergency bulletin inform the user that the emergency bulletin has been received by sounding a buzzer, pop-up display on the screen, and the like.

The individual packet delivery unicast system 200 has a function of delivering emergency bulletins to mobile terminals that are communicating (that is, mobile terminals that are communicating). In order to realize this function, the individual packet distribution unicast system 200 sends an emergency bulletin notification to the mobile terminal that is communicating the emergency bulletin acquired by the emergency bulletin distribution server device 1 as described later. A server device 20, a GGSN (Gateway GPRS Support Node) 21, an SGSN 22, and an RNC (Radio Network Controller) 23 are provided. In this example, a case will be described in which emergency bulletin is transmitted to the mobile terminals 2A to 2C via the individual CH.
The distributed emergency bulletin is information including an emergency bulletin target area such as “Tohoku region” and emergency contents such as “risk of occurrence of earthquake of seismic intensity X”.

(Functional configuration example of emergency bulletin notification server device)
FIG. 2 is a diagram showing a functional configuration example of the emergency breaking news notification server device 20 in FIG. In FIG. 2, the emergency bulletin notification server device 20 includes an emergency bulletin notification target user list table 201 that holds an IP address and a registration area indicating an area desired to be distributed, and an emergency bulletin notification target for each mobile terminal. A delivery area management unit 202 that determines whether or not to transmit an emergency bulletin to a mobile terminal with reference to the contents stored in the user list table 201, a reception unit 203 that receives emergency bulletin, and a transmission unit that transmits emergency bulletin 204.
In addition, each part which comprises the emergency bulletin notification server apparatus 20 is realizable when CPU which is not shown performs a program.

(Functional configuration example of GGSN)
FIG. 3 is a diagram illustrating a functional configuration example of the GGSN 21 in FIG. In FIG. 3, the GGSN 21 indicates a reservation state indicating whether the IP address of the mobile terminal for each user, PDP context (Packet Data Protocol Context) information, and a communication path based on the PDP context information is in a reservation state. A preservation state table 211 that holds information, a preservation state management unit 212 that refers to the content held in the preservation state table 211, determines whether to send or discard an emergency bulletin to the mobile terminal, and an emergency bulletin And a transmission unit 214 that transmits emergency bulletin, and functions as a mobile communication server device. In addition, the reservation state management unit 212 receives a notification regarding the reservation state of the communication path from the SGSN to the mobile terminal, and rewrites the reservation state information held in the reservation state table 211.
In addition, each part which comprises GGSN21 is realizable when CPU which is not shown performs a program.

(Emergency early warning server device and GGSN processing)
With reference to FIG. 4, the process of the emergency early warning server device 20 and the GGSN 21 will be described. In FIG. 4, the emergency bulletin notification target user list table 201 in the emergency bulletin notification server device 20 holds an IP address of a mobile terminal and a registration area indicating an area desired to be distributed. In this example, the IP address is “ABCD” and the registration area is registered as “Tohoku” in the urgent bulletin notification target user list table 201 in this example. Further, the IP address of the mobile terminal 2B is registered as “EFGH” and the registration area is registered as “Hokkaido”. Further, the IP address of the mobile terminal 2C is registered as “IJKL” and the registration area is registered as “Tohoku”.

On the other hand, the preservation state table 211 in the GGSN 21 holds the IP address of the mobile terminal, PDP context information, and preservation state information. The IP address of the mobile terminal is registered in the preservation state table 211 when creating a communication path by PDP.
In the preservation state table 211, in this example, for the IP address “ABCD” of the mobile terminal, the TEID (Tunnel Endpoint IDentifier) and IP address for SGSN as the PDP context information, and the preservation state information "Preservation state" (RRC Idle mode) is registered. Also, for the IP address “IJKL” of the mobile terminal, TEID and IP address for SGSN are registered as PDP context information, and “non-preservation state” (RRC Connected mode) is registered as reservation state information Has been.

  In the state where the above contents are registered in the emergency bulletin notification target user list table 201 and the preservation state table 211, if there is a possibility of an earthquake of seismic intensity 5 in the Tohoku region, the emergency bulletin distribution server device 1 Send earthquake early warning notification. The emergency bulletin notification server device 20 that has received the earthquake bulletin notification from the emergency bulletin distribution server device 1 refers to the emergency bulletin notification target user list table 201 and acquires the IP address of the mobile terminal whose registration area is “Tohoku”. . Then, an emergency bulletin notification is sent to the mobile terminal with the IP address “ABCD” and the mobile terminal with the IP address “IJKL” acquired from the emergency bulletin notification target user list table 201. The server device 20 transmits an earthquake early warning notification.

The earthquake bulletin notification transmitted by the emergency bulletin notification server device 20 is received by the GGSN 21. The GGSN 21 refers to the preservation state table 211, and transmits the earthquake early warning notification to the mobile terminal 2C having the IP address “IJKL” whose preservation state information is “non-preservation state”. To do. Further, the GGSN 21 refers to the reservation state table 211, and transmits the earthquake early warning notification to the mobile terminal 2A having the IP address “ABCD” whose reservation state information is “Preservation state”. do not do.
The earthquake bulletin notification is received by the mobile terminal 2C via the GGSN 21, SGSN 22, RNC 23 and a radio base station (not shown). When the mobile terminal 2C receives the earthquake early warning notification, the mobile terminal 2C notifies the user that the earthquake early warning notification has been received by sounding a buzzer, pop-up display on the screen, or the like.

(Operation of emergency bulletin distribution system)
Returning to FIG. 1, when the CBS server device 10 of the cell broadcast system 100 receives the emergency bulletin distribution notification from the emergency bulletin distribution server device 1 such as the Japan Meteorological Agency server device, it broadcasts the CBS Message toward the distribution area. At this time, the CBS Message distributed from the CBS server device 10 cannot be received for a mobile terminal that is in communication with the radio base station 11 (for example, RRC (Radio Resource Control) Connected mode). . As described above, since the mobile terminal in communication cannot receive the CBS Message, the emergency bulletin notification server device 20 delivers the emergency bulletin packet in parallel with the broadcast by the cell broadcast system 100.

  The emergency bulletin notification server device 20 receives an emergency bulletin distribution notification from the emergency bulletin distribution server device 1 such as a server device of the Japan Meteorological Agency. Examples of information elements included in the emergency bulletin delivery notification include a delivery area, importance, and delivery text. Upon receiving this emergency bulletin distribution notification, the emergency bulletin notification server device 20 performs emergency bulletin distribution to the mobile terminal that has the distribution area set as the registration area.

Hereinafter, the operation of the emergency early warning delivery system will be described in detail.
(Pre-registration)
The user who wants to receive the emergency bulletin registers the emergency bulletin distribution area from the mobile terminal to the emergency bulletin notification server device 20 in advance. For example, if an earthquake occurs in the Tohoku area, and you want to receive an emergency earthquake warning, register “Tohoku area” as the emergency breaking news distribution area.
Even if the emergency bulletin distribution area is not registered by the user's input operation, the application installed in the mobile terminal performs a self-location search, and the emergency bulletin distribution request with the position information as the emergency bulletin distribution area is urgent. The bulletin notification server device 20 may be notified. Further, the position may be registered in the emergency bulletin notification server device 20 as an emergency bulletin distribution area by self-location notification.

  As shown in FIG. 4, the emergency bulletin notification server device 20 associates the IP address of the mobile terminal with the emergency bulletin distribution area and holds it in the emergency bulletin notification target user list table 201. Further, the mobile terminal 2C may periodically exchange signals with the emergency bulletin notification server device 20 in order to maintain a session with the emergency bulletin notification server device 20. The emergency bulletin notification server device 20 may periodically exchange signals with the mobile terminal 2C in order to maintain a session with the mobile terminal 2C.

(Preservation state management)
When the mobile terminal 2C starts packet communication, the mobile terminal 2C transmits PDP context (Packet Data Protocol Context) information from the mobile terminal 2C, establishes a communication path with the GGSN 21, and performs packet communication via this communication path. In the state where this communication path is established, when there is no packet communication for a certain period of time, the SGSN 22 can release radio resources (transition to the preservation state) by notifying the RNC 23 of an Iu Release Command signal. It is also possible to instruct the network to make a transition from the mobile terminal to the preservation. In these cases, the PDP remains established between the SGSN and the GGSN, but resources between the SGSN and the RNC and between the RNC and the mobile terminal are released.

  A method for detecting that the GGSN 21 has transitioned to the preservation state is not defined in the standard. Here, since it can be detected that the SGSN 22 has transitioned to the preservation state, immediately after the transition to the preservation state, the SGSN 22 can notify the GGSN 21 of the preservation state. By making this notification, as shown in FIG. 4, the GGSN 21 can associate and maintain the PDP context information held by itself and the preservation state information in the preservation state table 211 and manage them.

  Note that the SGSN 22 can also detect that the preservation state has been released, so that the SGSN 22 can notify the GGSN 21 of the preservation state immediately after the preservation state is released. By performing this notification, it is possible to rewrite the contents stored in the preservation state table 211.

(Operation when in the preservation state)
FIG. 5 is a sequence diagram showing the operation of this system when the communication path to the mobile terminal that is the delivery destination of the emergency bulletin is in the preservation state. FIG. 5 shows the transmission / reception of signals and the state of the communication path for the emergency bulletin distribution server device 1, the emergency bulletin notification server device 20, the GGSN 21, the SGSN 22, and the RNC 23 mobile terminal 2A.

  In FIG. 5, when the PDP establishment process is performed (step S100), a communication path by PDP is formed. In a state where a communication path using PDP is formed, the mobile terminal 2A can register the emergency bulletin distribution area in the emergency bulletin notification target user list table 201 of the emergency bulletin notification server device 20 (step S101). For example, it is possible to register the IP address of the mobile terminal 2A as “ABCD” and the emergency bulletin distribution area as “Tohoku” (step S102).

  Thereafter, when there is no data communication (packet communication) for a certain period of time, the SGSN 22 can release radio resources (transition to the preservation state) by notifying the RNC 23 of an Iu Release Command signal. It is also possible to instruct the network side to make a transition from the mobile terminal 2A to the preservation state. In the case of the preservation state, the communication path by the PDP is maintained between the SGSN 22 and the GGSN 21, but the resource between the SGSN 22 and the RNC 23 and the resource between the RNC 23 and the mobile terminal 2A are To be released. A state in which this resource is released is indicated by a broken line in FIG.

  The method by which the GGSN 21 detects that the communication path has transitioned to the preservation state is not standardized. However, since it can be detected that the SGSN 22 has transitioned to the preservation, the SGSN 22 notifies the GGSN 21 of the preservation state, and the GGSN 21 itself maintains the PDP context and the preservation as shown in FIG. The state information can be stored in the preservation state table 211 in association with the state information.

If an earthquake occurs in the Tohoku area while the communication path is in the preservation state, the emergency bulletin distribution server device 1 transmits the emergency bulletin (step S105). This emergency bulletin is received by the GGSN 21 via the emergency bulletin notification server device 20 (step S106). Here, since it is a preservation state, the emergency bulletin is discarded in the GGSN 21 (step S107).
That is, as shown in FIG. 5, the GGSN 21 that has received the emergency bulletin distribution confirms the preservation state of the communication path to the mobile terminal that is the distribution destination, and if the mobile terminal is in the preservation state (RRC Idle mode), Since CBS Message can be received, the emergency bulletin is not distributed to the SGSN 22 but discarded by the GGSN 21.

(Operation when in non-preservation state)
FIG. 6 is a sequence diagram showing the operation of this system when the communication path to the mobile terminal that is the delivery destination of the emergency bulletin is not in the preservation state. FIG. 6 shows the transmission and reception of signals and the state of the communication path for the emergency bulletin distribution server device 1, the emergency bulletin notification server device 20, the GGSN 21, the SGSN 22, and the RNC 23 mobile terminal 2A.

  In FIG. 6, when the PDP establishment process is performed (step S100), a communication path by PDP is formed. In a state where a communication path using PDP is formed, the mobile terminal 2A can register the emergency bulletin distribution area in the emergency bulletin notification target user list table 201 of the emergency bulletin notification server device 20 (step S101). For example, it is possible to register the IP address of the mobile terminal 2A as “ABCD” and the emergency bulletin distribution area as “Tohoku” (step S102).

  When an earthquake occurs in the Tohoku area in a state where a communication path is formed by PDP (non-preservation state), the emergency bulletin distribution server device 1 transmits an emergency bulletin (step S105). This emergency bulletin is received by the GGSN 21 via the emergency bulletin notification server device 20 (step S106). Here, since it is not in the preservation state, the emergency bulletin is not discarded in the GGSN 21, but is transmitted to the mobile terminal 2A via the communication path by PDP (step S108).

  That is, in this system, it is managed whether it is a preservation state. And in a preservation state, since distribution via shared CH is possible, GGSN discards emergency bulletin and delivers emergency bulletin by CBS. On the other hand, when it is not in the preservation state, since it can be distributed via the individual CH, the emergency bulletin is distributed from the GGSN via the SGSN or the like.

  That is, as shown in FIG. 6, the GGSN 21 that has received the emergency bulletin distribution cannot receive the CBS Message when the communication path to the mobile terminal that is the distribution destination is not in the preservation state (RRC Connected mode). Is distributed to the SGSN 22 without discarding, and the SGSN 21 distributes the emergency bulletin to the mobile terminal.

(Identification of emergency bulletin notification server)
In the above operation example, by registering the IP address of the emergency bulletin notification server device 20 that is the operation target of this system in the GGSN 21 in advance, the GGSN 21 is the sender of the emergency bulletin with the IP address as an identifier. The emergency bulletin notification server device 20 is identified.

  In order to eliminate the need for pre-registration of the IP address of the emergency bulletin notification server device 20, a configuration in which a flag as an identifier is inserted into the IP packet may be employed. That is, the emergency bulletin notification server device 20 inserts a flag in the header portion or body portion of the IP packet. Then, by confirming that the flag is inserted in the GGSN 21, it is possible to determine that the IP packet is an operation target of the present system. The emergency bulletin notification server device 20 inserts the flag F into the header portion H of the packet P as shown in FIG. 7A or the flag F into the body portion B of the packet P as shown in FIG. Or just insert it.

  When the configuration in which the emergency bulletin notification server device 20 inserts the flag in this way is adopted, it is not necessary to register the IP address of the emergency bulletin notification server device 20 in the GGSN 21 in advance. It can be determined whether or not this system is an operation target. That is, the flag inserted by the emergency bulletin notification server device 20 is a flag indicating that it is an emergency bulletin (IP packet), and includes this flag, and the communication path to the mobile terminal is in the preservation state. If so, the GGSN 21 discards the emergency bulletin (its IP packet).

(Emergency breaking news delivery method)
With reference to FIG. 8, the emergency alert delivery method of this example is demonstrated. FIG. 8 is a flowchart showing an emergency bulletin distribution method that can be realized by the emergency bulletin distribution system described above. In FIG. 8, the receiving part of the emergency bulletin notification server device receives the emergency bulletin including the emergency bulletin target area and the emergency content (step S11). Then, the emergency early warning notification target user list table 201 is referred to, and the emergency early warning target area included in the received emergency early warning includes the emergency early warning distribution area held in the emergency early warning notification target user list table 201. The distribution area management unit determines whether or not (Step S12). As a result of the determination by the distribution area management unit in step S12, if the emergency early warning target area includes the emergency early warning delivery area, the emergency early warning is transmitted to the address of the mobile terminal associated with the emergency early warning delivery area. (Steps S12 → S13). On the other hand, as a result of the determination by the distribution area management unit in step S12, if the emergency early warning distribution area is not included in the emergency early warning target area, the process ends (step S12 → S18).

Next, the receiving unit of the mobile communication server device receives the emergency bulletin transmitted by the emergency bulletin notification server device (step S14). Then, the preservation state table 211 is referred to, and the preservation state management unit determines whether the communication path to the mobile terminal of the address that is the destination of the received emergency bulletin is in the preservation state (step S15).
As a result of the determination by the preservation state management unit, if the state is not the preservation state, the emergency bulletin is transmitted to the mobile terminal (step S15 → S16), and then the process is terminated (step S16 → S18). On the other hand, as a result of the determination by the preservation state management unit, if the communication path to the mobile terminal is in the preservation state, the emergency bulletin is discarded (step S15 → S17), and then the process ends (steps S17 → S18). ).

(Modification)
In the example described above, the preservation state determination process, the emergency bulletin distribution, and the emergency breaking discard determination process are executed in the GGSN 21, but at least a part of these processes may be executed in the SGSN 22.
This system is applicable to both a telephone communication network compliant with the LTE (Long Term Evolution) standard and a telephone communication network compliant with the IMT-2000 standard, as long as the preservation state of the communication path can be managed. can do.
In addition, although the above demonstrated the case of the earthquake early warning, it is clear that this system is applicable not only to this but to the emergency early warning about all disasters, such as an emergency tsunami warning, an emergency typhoon warning, and an emergency fire warning.

(Summary)
As described above, in this system, by managing whether or not the communication path to the mobile terminal is in a preservation state, the mobile communication is also performed for the mobile terminal that is in communication and cannot receive the emergency bulletin by the CBS. It is possible to deliver emergency bulletins without overloading the core network. Thereby, it is possible to support the user to take the primary evacuation action earlier, and to reduce the influence on human life due to an emergency such as a disaster.

  It should be noted that the scope of the present invention is not limited to the illustrated and described exemplary embodiments, but includes all embodiments that provide the same effects as those intended by the present invention. Further, the scope of the invention is not limited to the combinations of features of the invention defined by the claims, but may be defined by any desired combination of particular features among all the disclosed features. .

  The present invention can be used when an emergency bulletin is distributed to a mobile terminal.

DESCRIPTION OF SYMBOLS 1 Emergency bulletin distribution server apparatus 2A-2C, 2a-2d Mobile terminal 10 CBS server apparatus 11 Wireless base station 20 Emergency bulletin notification server apparatus 21 GGSN
22 SGSN
23 RNC
100 cell broadcast system 200 individual packet distribution unicast system 201 user list table 202 for emergency early warning notification distribution area management unit 203 reception unit 204 transmission unit 211 reservation state table 212 preservation state management unit 213 reception unit 214 transmission unit

Claims (8)

A first table for associating and holding an address of a mobile terminal and an emergency bulletin distribution area of the mobile terminal; a receiving unit for receiving an emergency bulletin including an emergency bulletin target area and emergency contents; and the first table And a distribution area management unit that determines whether the area for emergency bulletin included in the emergency bulletin received by the reception unit includes the emergency bulletin distribution area held in the first table. As a result of the determination of the delivery area management unit, when the emergency breaking news distribution area is included in the emergency breaking news target area, the emergency breaking news is directed toward the address of the mobile terminal associated with the emergency breaking news delivery area. An emergency bulletin notification server device including a transmission unit for transmitting
A second table that holds an address of the mobile terminal and preservation state information indicating whether or not a communication path to the mobile terminal is in a preservation state; and the emergency bulletin transmitted by the emergency bulletin notification server device Preservation state management that determines whether the communication path to the mobile terminal of the address that is the destination of the emergency bulletin received by the receiving unit is in a preservation state with reference to the receiving unit that receives the second table and the second table And when the communication path to the mobile terminal is in the preservation state, the emergency breaking information is discarded, and if the communication path to the mobile terminal is not in the preservation state, the emergency breaking information is directed to the mobile terminal. A mobile communication server device comprising a transmitting unit for transmitting;
An emergency bulletin distribution system characterized by including:   2. The emergency bulletin distribution system according to claim 1, further comprising a broadcast distribution server device that broadcasts an emergency bulletin including an emergency bulletin target area and emergency contents. 3. The emergency breaking news distribution system according to claim 1, wherein the preservation state management unit of the mobile communication server device acquires the preservation state information about a communication path to the mobile terminal, Rewrite the preservation status information stored in the table
The address that is the destination of the emergency bulletin received by the receiving unit of the mobile communication server device matches the address held in the second table, and the communication path to the mobile terminal is in a preservation state. If so, an emergency bulletin distribution system characterized by discarding the emergency bulletin. 3. The emergency breaking news distribution system according to claim 1, wherein the preservation state management unit of the mobile communication server device acquires the preservation state information about a communication path to the mobile terminal, Rewrite the preservation status information stored in the table
If the emergency bulletin received by the receiving unit of the mobile communication server device includes a flag indicating that it is emergency bulletin, and the communication path to the mobile terminal is in a preservation state, the emergency bulletin Emergency bulletin distribution system characterized by discarding A mobile communication server device used in an emergency bulletin distribution system for transmitting an emergency bulletin toward an address of a mobile terminal associated with an emergency bulletin distribution area,
A second table that holds an address of the mobile terminal and preservation state information indicating whether or not a communication path to the mobile terminal is in a preservation state; and the emergency bulletin transmitted by the emergency bulletin notification server device Preservation state management that determines whether the communication path to the mobile terminal of the address that is the destination of the emergency bulletin received by the receiving unit is in a preservation state with reference to the receiving unit that receives the second table and the second table And when the communication path to the mobile terminal is in the preservation state, the emergency breaking information is discarded, and if the communication path to the mobile terminal is not in the preservation state, the emergency breaking information is directed to the mobile terminal. A mobile communication server device comprising: a transmitting unit for transmitting. 6. The mobile communication server apparatus according to claim 5, wherein when the reservation state management unit acquires the reservation state information about a communication path to the mobile terminal, the reservation state management unit holds the reservation state information in the second table. Rewrite the preservation state information,
If the address that is the destination of the emergency bulletin received by the reception unit matches the address held in the second table, and the communication path to the mobile terminal is in a preservation state, the emergency bulletin A mobile communication server device characterized by discarding. 6. The mobile communication server apparatus according to claim 5, wherein when the reservation state management unit acquires the reservation state information about a communication path to the mobile terminal, the reservation state management unit holds the reservation state information in the second table. Rewrite the preservation state information,
The emergency bulletin received by the receiver includes a flag indicating that it is an emergency bulletin, and the emergency bulletin is discarded if the communication path to the mobile terminal is in a preservation state. A mobile communication server device. A first table for associating and holding an address of a mobile terminal and an emergency bulletin distribution area of the mobile terminal; a receiving unit for receiving an emergency bulletin including an emergency bulletin target area and emergency contents; and the first table And a distribution area management unit that determines whether the area for emergency bulletin included in the emergency bulletin received by the reception unit includes the emergency bulletin distribution area held in the first table. As a result of the determination of the delivery area management unit, when the emergency breaking news distribution area is included in the emergency breaking news target area, the emergency breaking news is directed toward the address of the mobile terminal associated with the emergency breaking news delivery area. An emergency bulletin notification server device including a transmission unit for transmitting
A second table that holds an address of the mobile terminal and preservation state information indicating whether or not a communication path to the mobile terminal is in a preservation state; and the emergency bulletin transmitted by the emergency bulletin notification server device Preservation state management that determines whether the communication path to the mobile terminal of the address that is the destination of the emergency bulletin received by the receiving unit is in a preservation state with reference to the receiving unit that receives the second table and the second table And when the communication path to the mobile terminal is in the preservation state, the emergency breaking information is discarded, and if the communication path to the mobile terminal is not in the preservation state, the emergency breaking information is directed to the mobile terminal. A mobile communication server device comprising a transmitting unit for transmitting;
An emergency breaking news delivery method realized by an emergency breaking news delivery system including
A first step in which the receiving unit of the emergency bulletin notification server device receives an emergency bulletin including an emergency bulletin target area and emergency contents, and the emergency bulletin received in the first step with reference to the first table. A second step in which the distribution area management unit determines whether the emergency early warning target area included in the emergency early warning target area included in the first table is included; and the second step in the second step As a result of the determination by the distribution area management unit, when the emergency breaking news distribution area is included in the emergency breaking news target area, the emergency breaking news is transmitted to the address of the mobile terminal associated with the emergency breaking news distribution area. A third step and a fourth step in which the receiver of the mobile communication server device receives the emergency bulletin transmitted by the emergency bulletin notification server device. And the reservation state management unit determines whether the communication path to the mobile terminal of the address which is the destination of the emergency bulletin received in the fourth step is in a reservation state with reference to the second table. If the communication path to the mobile terminal is in the preservation state as a result of the determination in the fifth step and the reservation state management unit, the emergency bulletin is discarded, and if the communication path to the mobile terminal is not in the preservation state, the emergency bulletin is transmitted to the mobile terminal. And a sixth step of transmitting to the emergency breaking news distribution method characterized by comprising:

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