JP5690290B2 - Session control server, communication system, and communication method - Google Patents

Description

  The present invention relates to a session control server, a communication system, and a communication method for controlling an outgoing call sent from a terminal identified by a telephone number based on a subscriber class.

  With the recent development of information communication, IP telephone terminals have become widespread. This IP telephone terminal is connected to another IP telephone terminal via a subscriber service edge, a session control server, a relay session control server, and the like. At this time, a SIP (Session Initiation Protocol) message is transmitted and received in the communication system.

  The session control server determines whether to connect the call based on the subscriber class assigned to each terminal. The session control server preferentially connects calls from high subscriber class terminals. This subscriber class is divided into three classes: a priority telephone class UR1, a public telephone class UR, and a general subscriber class GN. The disaster priority telephone class UR1 is a subscriber class with the highest priority, and is assigned to a terminal that should be given the highest priority in the event of a disaster, such as a police station or a fire department. The public telephone class UR is a subscriber class having the second highest priority after the disaster priority telephone class UR1, and is assigned to a public telephone. The general subscriber class GN is assigned to a terminal to which the public telephone class UR and the disaster priority telephone class UR1 are not assigned, such as a general household telephone.

  In general, when a catastrophic disaster occurs, many calls are made to telephone terminals in the affected area in order to confirm the status and safety of the residents in the affected area. As a result, congestion occurs in the affected area, making it difficult to connect calls. In order to avoid this, there is a method of restricting connection to the congestion range (for example, see Patent Document 1).

  In addition, calls destined for telephone terminals in the disaster area are concentrated on the session control server that accommodates the telephone terminals in the disaster area. As a result, the load on the session control server in the stricken area increases, and a regulation for restricting the outgoing call in the session control server in the stricken area may be activated.

JP 2010-268198 A

  As a result of the restriction being activated on the session control server in the disaster area, the outgoing call from the telephone terminal of the general subscriber class in the disaster area also becomes difficult to be connected. As a result, there arises a problem that it is difficult to connect highly urgent calls such as rescue requests and situation notifications required in the affected area.

  In a severe disaster, there are many opportunities to make highly urgent calls even in terminals of the general subscriber class, and these calls need to be given priority. Therefore, when a catastrophic disaster occurs, it is expected that the priority of the terminal call in the affected area is increased and the outgoing call in the affected area is preferentially connected.

  Accordingly, an object of the present invention is to provide a session control server, a communication system, and a communication method that can be preferentially communicated by terminals in a disaster area.

In order to solve the above problems, a first feature of the present invention relates to a session control server that controls a call of a terminal identified by a telephone number based on a subscriber class corresponding to the telephone number. That first session control server according to the features of the present invention, the telephone number may include a number band corresponding to the area where the terminal is located, and a subscriber number identifying the terminal in the area, the session control server Is connected to the terminal via the subscriber service edge, and the subscriber class data in which the telephone number of the terminal is associated with the subscriber class assigned to the telephone number, and the terminal controlled by the session control server are located. Subscriber service in which location data that associates an identifier of a region to be associated with a number band corresponding to the region, an identifier of a subscriber service edge, and a telephone number of a terminal accommodated by the subscriber service edge a storage device for storing the edge data, the, upon receiving the identifier of the affected areas, from Tokoro data, extracts a number band corresponding to the affected areas, subscriber class data Et al, extracts the phone number, including the number zone, the subscriber service edge data, obtains the identifier of the subscriber service edge associated with the extracted telephone number, from the subscriber service edge data acquisition A change target determining means for extracting a telephone number associated with the identifier of the subscriber service edge and outputting the telephone number extracted from the subscriber service edge data as change target data; and at least a part of the change target data And a class changing means for updating the subscriber class data by raising the subscriber class corresponding to the telephone number.

  Moreover, you may provide the load monitoring means to hold | maintain the load value of a session control server. In this case, when the load value falls below a predetermined threshold, the class changing means further returns the telephone number of the subscriber class raised to the original subscriber class and updates the subscriber class data.

According to a second aspect of the present invention, there is provided a session control server that controls a call of a terminal identified by a telephone number based on a subscriber class corresponding to the telephone number; a regulation monitoring server that is connected to the session control server; And a communication system comprising: That is, in the communication system according to a second aspect of the present invention, telephone number, and number band corresponding to the region where the terminal is located, viewed contains a subscriber number identifying the terminal in the area, the session control server Connects to the terminal via the subscriber service edge . The regulation monitoring server sequentially connects to a weather server that provides information on the affected area at the time of a disaster, acquires the affected area data including the identifier of the affected area, and transmits the affected area data to the session control server Is provided. The session control server includes subscriber class data in which a terminal telephone number is associated with a subscriber class assigned to the telephone number, an identifier of an area in which the terminal controlled by the session control server is located, and A storage device that stores location data associated with corresponding number bands, subscriber service edge identifiers, and subscriber service edge data associated with a telephone number of a terminal accommodated by the subscriber service edge When the affected area data is received from the regulatory monitoring server, the number band corresponding to the affected area is extracted from the location data, the telephone number including the number band is extracted from the subscriber class data, and the subscriber service edge The subscriber service edge identifier associated with the extracted telephone number is acquired from the data, and the subscriber service edge data is acquired. From, extracts the phone number associated with the identifier of the subscriber service edge acquired, the telephone number extracted from the subscriber service edge data, the change target decision means for outputting as a change target data, the change target data Class changing means for increasing subscriber class corresponding to at least some telephone numbers and updating subscriber class data.

According to a third aspect of the present invention, there is provided a session control server for controlling a call of a terminal identified by a telephone number based on a subscriber class corresponding to the telephone number; a regulation monitoring server connected to the session control server; The present invention relates to a communication method used in a communication system comprising: In the communication method according to the third aspect of the present invention, the telephone number includes a number band corresponding to an area where the terminal is located, and a subscriber number identifying the terminal in the area, and the session control server includes: Connect to the terminal via the subscriber service edge, the regulation monitoring server sequentially connects to the weather server that provides information on the affected area at the time of disaster, acquires the affected area data including the identifier of the affected area, and the session control server The step of transmitting the disaster area data, and when the session control server receives the disaster area data from the regulatory monitoring server, the identifier of the area where the terminal controlled by the session control server is located, and the number band corresponding to the area From the location data, and the number band corresponding to the affected area is extracted, and the phone number of the terminal and the subscriber class assigned to the phone number are The subscriber class data association response, extracts the phone number, including the number band, the identifier of the subscriber service edge, subscriber service edge and telephone number of the terminal to which the subscriber service edge to accommodate associates The subscriber service edge identifier associated with the extracted telephone number is acquired from the data, and the telephone number associated with the acquired subscriber service edge identifier is extracted from the subscriber service edge data. A step of outputting the telephone number extracted from the subscriber service edge data as data to be changed, and the session control server raises a subscriber class corresponding to at least a part of the telephone numbers of the data to be changed. Updating the data.

  Further, the session control server holds the load value of the session control server, and when the load value falls below a predetermined threshold, the session control server uses the original subscription for the telephone number whose subscriber class has been raised. The method may further comprise the step of returning to the subscriber class and updating the subscriber class data.

  According to the present invention, it is possible to provide a session control server, a communication system, and a communication method that can be preferentially communicated by terminals in a disaster area.

It is a figure explaining the system configuration | structure of the communication system which concerns on embodiment of this invention. It is a figure explaining the subscriber class which concerns on embodiment of this invention. It is a figure explaining the subscriber class of each terminal which concerns on embodiment of this invention. It is a sequence diagram explaining the communication method which concerns on embodiment of this invention. It is a figure explaining the hardware constitutions and functional block of the session control server which concern on embodiment of this invention. It is a figure explaining the data structure of the place data which concerns on embodiment of this invention, and an example of data. It is a figure explaining an example of data structure and data of subscriber class data concerning an embodiment of the invention. It is a flowchart explaining the process of the session control server which concerns on embodiment of this invention. It is a figure explaining the subscriber class of each terminal which concerns on a 1st modification. It is a figure explaining the hardware constitutions and functional block of the session control server which concern on a 1st modification. It is a figure explaining an example of a data structure and data of subscriber service edge data concerning the 1st modification. It is a flowchart explaining the process of the session control server which concerns on a 1st modification. It is a figure explaining the subscriber class of each terminal which concerns on a 2nd modification. It is a figure explaining the hardware constitutions and functional block of the session control server which concern on a 2nd modification. It is a flowchart explaining the process of the session control server which concerns on a 2nd modification. It is a figure explaining the subscriber class which concerns on a 3rd modification.

  Next, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

(Communications system)
A communication system 100 according to an embodiment of the present invention will be described with reference to FIG. The communication system 100 includes session control servers 1 and 4, subscriber service edges 2 a, 2 b, 5 a, 5 b, terminals 3 a, 3 b, 3 c, 3 d, 3 e, 3 f, 6 a, 6 b, 6 c, relay session control server 7, regulation A monitoring server 8 and a weather server 9 are provided. In the embodiment for carrying out the invention, the subscriber service edges 2a and 2b may be simply referred to as the subscriber service edge 2 unless they are particularly distinguished. If the subscriber service edges 5a and 5b are not particularly distinguished, they may be simply referred to as the subscriber service edge 5. If the terminals 3a, 3b, 3c, 3d, 3e, and 3f are not particularly distinguished, they may be simply referred to as the terminal 3. When the terminals 6a, 6b and 6c are not particularly distinguished, they may be simply referred to as the terminal 6.

  The first terminal 3a is an IP network terminal, for example, an IP telephone. Each terminal is assigned a telephone number. Each terminal makes or receives a call based on the telephone number.

  Here, the telephone number includes a number band corresponding to an area where the terminal is located and a subscriber number for identifying the terminal in the area. This number band is generally the first six digits of a telephone number and includes a so-called area code and local code.

  The first subscriber service edge 2a accommodates terminals 3a, 3b, 3c and 3d. The first subscriber service edge 2a transmits and receives packets to and from these terminals. The same applies to the second subscriber service edge 2b, the third subscriber service edge 5a, and the fourth subscriber service edge 5b. The subscriber service edge may be referred to as SSE (Subscriber Service Edge).

  The relay session control server 7 transfers the packet between the first session control server and the second session control server 4. The relay session control server may be referred to as an ISC (Intermediate Session Control server).

  The first session control server 1 is connected to the relay session control server 7 and the regulation monitoring server 8, and accommodates the subscriber service edges 2a and 2b. The first session control server 1 controls the outgoing call sent from the terminal 3 based on the subscriber class. The same applies to the second session control server 4. The session control server may be referred to as an SSC (Subscriber Session Control server).

  The first session control server 1 assigns a subscriber class to the terminal 3 to be accommodated. The first session control server 1 preferentially sends and receives calls from terminals to which a high subscriber class is assigned.

  With reference to FIG. 2, the subscriber class used in the embodiment of the present invention will be described. In the embodiment of the present invention, there are four subscriber classes: priority telephone class UR1 at the time of disaster, public telephone class UR, disaster area general subscriber class X, and general subscriber class GN. Among these, the disaster priority telephone class UR1, the public telephone class UR, and the general subscriber class GN are conventional subscriber classes. The disaster area general subscriber class X has a higher priority than the general subscriber class GN, and has a lower priority than the disaster priority telephone class UR1 and the public telephone class UR. The disaster area general subscriber class X is assigned to a terminal of the general subscriber class GN in the disaster area when a severe disaster occurs.

  The regulation monitoring server 8 is connected to a plurality of session control servers of the first session control server 1 and the second session control server 4, and the regulation monitoring server 8 is sequentially connected to the weather server 9, and the identifier of the affected area The disaster area transmission means for acquiring the disaster area data including The disaster area transmission means further transmits the disaster area data to the first session control server 1 and the second session control server 4. The regulation monitoring server 8 may transmit the disaster area data by broadcasting.

  The weather server 9 detects that a disaster has occurred, and provides information on the affected area at the time of the disaster. In the embodiment of the present invention, the meteorological server 9 transmits information on the affected area where the catastrophic disaster has occurred to the regulation monitoring server 8 when a catastrophic disaster occurs. In the embodiment of the present invention, “disaster” refers to a catastrophic disaster such as a large-scale earthquake or typhoon, and assumes a disaster in which a plurality of people or houses are damaged within a certain wide range.

  With reference to FIG. 3, the telephone number of the terminal shown in FIG. 1 and the subscriber class assigned to the terminal will be described. The telephone numbers of the first terminal 3a, the second terminal 3b, and the fourth terminal 3d are telephone numbers that start with a common number band “xxxx-ax”. On the other hand, the third terminal 3c, the fifth terminal 3e, and the sixth terminal 3f are telephone numbers that start with a common number band “xxxx-bx”. The subscriber class of the first terminal 3a, the third terminal 3c, and the fifth terminal 3e is a general subscriber class GN. The subscriber class of the second terminal 3b and the sixth terminal 3f is the public telephone class UR. The subscriber class of the fourth terminal 3d is the disaster priority telephone class UR1.

  In the embodiment of the present invention, the general subscriber class GN is assigned to the first terminal 3a and the seventh terminal 6a. Assume that a disaster occurs in an area where the first terminal 3a is located. In this case, the subscriber class of the first terminal 3a located in the affected area is changed from the general subscriber class GN to the affected area general subscriber class X. On the other hand, the subscriber classes of the third terminal 3c, the fifth terminal 3e, and the seventh terminal 6a located outside the disaster area remain the general subscriber class GN. Further, the subscriber class of the second terminal 3b, the fourth terminal 3d, and the sixth terminal 3f to which a subscriber class other than the general subscriber class GN is assigned is not changed.

(Communication method)
With reference to FIG. 4, a communication method according to an embodiment of the present invention will be described. In the example illustrated in FIG. 4, a case where a disaster occurs in an area where the first terminal 3a is installed will be described. Due to the occurrence of a disaster, calls concentrated to the area where the first terminal 3a is located concentrates on the first session control server 1 and the second session control server 4, and outgoing calls are regulated. .

  First, the regulation monitoring server 8 periodically connects to the weather server 9 to determine whether a disaster has occurred. Specifically, in step S1, the regulation monitoring server 8 transmits a GET method for acquiring disaster information to the weather server 9, and acquires disaster information from the weather server 9 in HTML format in step S2.

  In step S <b> 3, the regulation monitoring server 8 determines whether or not a disaster that should change the subscriber class in the affected area has occurred based on the acquired information in the HTML format. Specifically, the regulation monitoring server 8 analyzes the syntax of HTML data, and acquires data such as the type of disaster that occurred and the disaster area. When the regulation monitoring server 8 collates with a predetermined condition and changes the subscriber class of the disaster area, the regulation monitoring server 8 generates the disaster area data including the identifier of the disaster area. In step S4, the regulation monitoring server 8 transmits the disaster area data by broadcasting.

  Here, each of the first session control server 1 and the second session control server 4 receives the disaster area data, and determines whether or not the installation position of the terminal accommodated in each is the disaster area. Here, since the 2nd session control server 4 has not accommodated the terminal located in a stricken area, it returns to a normal process after that.

  On the other hand, since the first session control server 1 accommodates the first terminal 3a located in the disaster area, the first session control server 1 performs processing based on the disaster area data. Specifically, in step S5, the first session control server 1 specifies the number zone of the disaster area from the identifier of the disaster area included in the disaster area data. Further, in step S6, the first session control server 1 extracts a telephone number starting with the number band of the affected area, and when the subscriber class corresponding to the extracted telephone number is the general subscriber class GN, Change to subscriber class X. Thereafter, the terminal assigned with the general subscriber class GN in the disaster area is upgraded to the disaster area general subscriber class X, and is easily transmitted.

  Specifically, in step S7, the first terminal 3a installed in the disaster area and having become the disaster area general subscriber class X is transferred to the seventh terminal 6a of the general subscriber class GN in the non-disaster area by the Initial- Send an INVITE message. The first session control server 1 receives the Initial-INVITE message transmitted from the first terminal 3a.

  Since the first session control server 1 is under outgoing call restriction, the first session control server 1 determines whether or not to transfer the Initial-INVITE message based on the subscriber class of the transmission source terminal. The first session control server 1 is in a state where outgoing calls are restricted and many other outgoing calls are received. Since the 1st terminal 3a is a disaster area general subscriber class, the 1st session control server 1 can give priority to the message of another general subscriber class. As a result, in step S8, the first session control server 1 transmits the Initial-INVITE message transmitted from the first terminal 3a to the relay session control server 7.

  When receiving the Initial-INVITE message, the relay session control server 7 transfers the Initial-INVITE message to the second session control server 4 accommodating the destination seventh terminal 6a in Step S9. In step S10, the second session control server 4 transfers the Initial-INVITE message to the seventh terminal 6a.

  Upon receiving the Initial-INVITE message, the seventh terminal 6a calls the user and transmits a 180 Ringing message to the second session control server 4 in step S11. In step S <b> 12, the second session control server 4 transfers the 180 Ringing message to the relay session control server 7. In step S <b> 13, the relay session control server 7 transfers the 180 Ringing message to the first session control server 1. In step S14, the first session control server 1 transfers the 180 Ringing message to the first terminal 3a.

  On the other hand, a case will be described in which the seventh terminal 6a transmits an Initial-INVITE message to the first terminal 3a. In step S <b> 21, the seventh terminal 6 a transmits an Initial-INVITE message to the second session control server 4.

  Since the second session control server 4 is under outgoing call restriction, the second session control server 4 determines whether or not to transfer the Initial-INVITE message based on the subscriber class of the transmission source terminal. Here, the subscriber class of the transmission source terminal transmitted in step S21 is a general subscriber class GN. Since the first terminal 3a is the general subscriber class GN, the second session control server 4 considers the subscriber class of other call messages and determines whether or not to transfer this Initial-INVITE message. decide. If it is determined not to transfer, in step S22, the second session control server 4 transmits a 503 ServiceUnavailable message to the seventh terminal 6a that is the transmission source.

  Thus, in the communication method according to the embodiment of the present invention, it is possible to preferentially connect outgoing calls from terminals located in a disaster area.

(Session control server)
A session control server 1 according to an embodiment will be described with reference to FIG. The session control server 1 is a general computer including a storage device 10, a central processing control device 20, a communication control device 30, and the like. Each function shown in FIG. 1 is realized in a general computer by executing a program for executing a predetermined process.

  The storage device 10 stores place data 11, change target data 12, and subscriber class data 13. The central processing control device 20 includes SIP message control means 21, change target determination means 22, class change means 23, and load monitoring means 24. The communication control device 30 is an interface for connecting the session control server 1 to be communicable with other devices.

  As shown in FIG. 6, the place data 11 is data in which an identifier of an area where the terminal 3 controlled by the first session control server 1 is located and a number band corresponding to the area are associated with each other. The “region identifier” of the place data 11 is, for example, a prefecture name and a city name. This corresponds to the area identifier of the disaster area data transmitted from the regulation monitoring server 8.

  The location data 11 may associate a plurality of number bands with one area identifier. In the example illustrated in FIG. 6, the number band “xxxx-ax” and the number band “xxxx-bx” are associated with the regional identifier “A prefecture B city”. One session control server controls terminals in a plurality of regions and a plurality of number bands as shown in FIG.

  The change target data 12 is data of a list of telephone numbers that can be a class change target. The change target data 12 is output by the change target determining means and is referenced by the class changing means 23.

  As shown in FIG. 7, the subscriber class data 13 is data in which the telephone number of the terminal 3 controlled by the first session control server 1 is associated with the subscriber class assigned to the telephone number. In the subscriber class data 13, when a disaster occurs and a predetermined condition is satisfied, the general subscriber class GN is changed to a disaster area general subscriber class X. When the load on the first session control server 1 falls below a predetermined value, the disaster area general subscriber class X is changed to the general subscriber class GN.

  The SIP message control means 21 controls the call of the terminal identified by the telephone number based on the subscriber class corresponding to the telephone number. When receiving the SIP message from the first terminal 3a, the SIP message control means 21 determines whether to transfer the SIP message based on the subscriber class assigned to the first terminal 3a. When not forwarding, the SIP message control means 21 transmits a SIP message to that effect to the first terminal 3a. When forwarding, the SIP message control means 21 sends the SIP message received from the first terminal 3a to the destination. Forward towards. In addition, various processes related to SIP messages between terminals are controlled.

  When receiving the identifier of the affected area from the regulation monitoring server 8, the change target determining unit 22 extracts a number band corresponding to the affected area from the place data 11. Further, the change target determining means 22 extracts a telephone number including the extracted number band from the subscriber class data 13 and outputs the telephone number extracted from the subscriber class data 13 as the change target data 12.

  For example, when the change target determining means 22 receives the identifier “A prefecture B city” of the affected area, the number band “xxxx-ax” corresponding to the affected area “A prefecture B city” from the place data 11 and the number The band “xxxx-bx” is acquired. Further, the change target determining unit 22 extracts a telephone number including the number band “xxxx-ax” and the number band “xxxx-bx” from the subscriber class data 13. In the case of a telephone number in which a subscriber number is concatenated after the number band, the change target determination means 22 extracts the telephone number that matches the number band “xxxx-ax” or the number band “xxxx-bx” in front and changes the number. The target data 12 is generated.

  The change target data 12 is a list of telephone numbers starting from the number band “xxxx-ax” or the number band “xxxx-bx” among the telephone numbers included in the subscriber class data 13. In the example illustrated in FIG. 3, the terminals that start with the number band “xxxx-ax” or the number band “xxxx-bx” are the first terminal 3a, the second terminal 3b, and the fourth terminal 3d. The change target determination means 22 outputs the telephone numbers of the first terminal 3a, the second terminal 3b, and the fourth terminal 3d as the change target data 12.

  The class changing unit 23 reads the change target data 12 from the storage device 10, raises the subscriber class corresponding to at least a part of the telephone numbers of the change target data 12, and updates the subscriber class data 13.

  Here, “at least a part of the telephone numbers” is a telephone number of a terminal that has a low priority in normal times but needs to be preferentially communicated due to the occurrence of a disaster. Specifically, among the terminals controlled by the session control server 1, the telephone number of a terminal located in an area notified as a disaster area from the regulation monitoring server 8, which is normally assigned by a general subscriber class GN Phone number.

  When the subscriber class corresponding to the telephone number of the change target data 12 is the general subscriber class GN, the class changing unit 23 changes to the disaster area general subscriber class X. When the subscriber class is the disaster priority telephone class UR1 or the public telephone class UR, the class changing unit 23 does not change the subscriber class.

  As shown in FIG. 3, the subscriber class of the first terminal 3a is the general subscriber class GN, the subscriber class of the second terminal 3b is the public telephone class UR, and the subscriber of the fourth terminal 3d. The class is the disaster priority telephone class UR1. Accordingly, the class changing means 23 updates the subscriber class data 13 by changing the subscriber class of the first terminal 3a from the general subscriber class GN to the disaster area general subscriber class X.

  Further, when the load value of the first session control server 1 held by the load monitoring unit 24 falls below a predetermined threshold, the class changing unit 23 returns the telephone number whose subscriber class has been raised to the original subscriber class. Then, the subscriber class data 13 is updated. The class changing means 23 reads the subscriber class data 13 and changes the disaster area general subscriber class X to the general subscriber class GN for the subscriber class.

  The load monitoring unit 24 holds the load value of the first session control server 1. The load monitoring unit 24 calculates the load value of the first session control server 1 from the traffic amount processed by the first session control server 1, the CPU load, the memory usage rate, and the like. When this load value falls below a predetermined threshold, a message to that effect is sent to the class changing means 23.

  With reference to FIG. 8, the process regarding the change of a subscriber class in the 1st session control server 1 is demonstrated.

  In step S <b> 101, the session control server 1 waits for the disaster area data to be transmitted from the regulation monitoring server 8. When the disaster area data is transmitted, the process proceeds to step S102.

  In step S102, the session control server 1 acquires the identifier of the disaster area of the disaster area data. In step S <b> 103, the session control server 1 converts the area identifier of the location data 11 according to the granularity of the acquired disaster area identifier, and identifies the area to be changed. For example, when the regulation monitoring server 8 notifies that the entire area is “A prefecture” as the affected area, the session control server 1 identifies all areas starting with “A prefecture” in the place data 11 as the areas to be changed. . Further, when “A prefecture B city” is notified as the affected area, the session control server 1 specifies all areas starting with “A prefecture B city” in the place data 11 as the areas to be changed.

  In step S104, the session control server 1 extracts the number band corresponding to the target area specified in step S103 from the place data 11. In step S105, processing is distributed based on whether or not a number band is extracted. When the number band is not extracted, specifically, when the session control server 1 accommodates a terminal not located in the disaster area, the process returns to step S101 and waits for reception of new disaster area data.

  On the other hand, if the number band is extracted, specifically, if the session control server 1 accommodates a terminal located in the affected area, the process proceeds to step S106. In step S106, the session control server 1 extracts the telephone number starting from the number band specified in step S104 from the subscriber class data 13, and outputs it as the change target data 12 in step S107.

  Next, the session control server 1 repeats the processing from step S108 to step S109 for each telephone number of the change target data 12. In step S108, the session control server 1 acquires the subscriber class associated with the telephone number of the change target data 12 from the subscriber class data 13, and the acquired subscriber class is the general subscriber class GN. It is determined whether or not. If it is not the general subscriber class GN, the process of step S108 is repeated for other telephone numbers. On the other hand, in the case of the general subscriber class GN, in step S109, the subscriber class is changed to the disaster area general subscriber class X, and the subscriber class data 13 is updated.

  When the processing of step S108 and step S109 is completed for each telephone number of the change target data 12, the session control server 1 controls the session based on the updated subscriber class. If it is determined in step S110 that the load on the session control server 1 has fallen below a predetermined threshold, the session control server 1 returns the subscriber class changed in step S109 to the original subscriber class in step S111. .

  For example, the session control server 1 starts class change processing for all telephone numbers of the affected area general subscriber class X in the subscriber class data 13. In step S111, the session control server 1 changes the subscriber class from the disaster area general subscriber class X to the general subscriber class GN.

  When the subscriber class is changed for all the telephone numbers of the disaster area general subscriber class, the process is terminated, and reception of new disaster area notification data is awaited.

  As described above, when a disaster occurs, the session control server 1 according to the embodiment of the present invention raises the subscriber class of the terminal in the affected area, thereby making an outgoing call from the affected area an outgoing call from the non-affected area. Compared with a call, it can be preferentially connected. In addition, due to the increase in the subscriber class, outgoing calls from the affected area are preferentially received at the session control server that accommodates the destination terminal as compared with outgoing calls from the non-affected area. .

  As a result, it is possible to preferentially call a highly urgent call such as a rescue request or a situation notification required in the affected area.

(First modification)
1 to 8, the case where the subscriber class is raised for the terminal located in the disaster area has been described. In the first modification, the case where the subscriber class is raised for each subscriber service edge is explained. To do.

  The session control server 1a according to the first modification is connected to the terminal 3 via the subscriber service edge 2 as in FIG. The session control server 1a accommodates a first subscriber service edge 2a and a second subscriber service edge 2b. Among these, in the case where the first terminal 3a accommodated by the first subscriber service edge 2a is a terminal located in the disaster area, the session control server 1a includes all terminals accommodated by the first subscriber service edge 2a. It is targeted for change. The terminals to be changed are the first terminal 3a, the second terminal 3b, the third terminal 3c, and the fourth terminal 3d among the terminals shown in FIG.

  The session control server 1a changes the subscriber class of the terminal of the general subscriber class GN among the change target terminals to the disaster area general subscriber class X. In the example shown in FIG. 9, the subscriber class of the first terminal 3a and the third terminal 3c among the terminals to be changed is the general subscriber class GN. Therefore, the session control server 1a changes the subscriber class of the first terminal 3a and the third terminal 3c to the disaster area general subscriber class X.

  Here, in the third terminal 3c, the number band of the telephone number is “xxxx-cx”. As shown in FIG. 6, this number band corresponds to “A prefecture C city”. In the first modified example, by changing the subscriber class in units of subscriber service edges, it is possible to deal with a wider range as the disaster area than the area that the weather server 9 lists as the disaster area.

  With reference to FIG. 10, the session control server 1a according to the first modification will be described. The session control server 1a according to the first modification is different from the session control server 1 described with reference to FIG. 5 in that the storage device 10 further stores the subscriber service edge data 14, and the change target determining means The processing of 22a is different.

  As shown in FIG. 14, the subscriber service edge data 14 is data in which the identifier of the subscriber service edge 2 is associated with the telephone number of the terminal 3 accommodated in the subscriber service edge 2.

  When receiving the disaster area data from the regulation monitoring server 8, the change target determination unit 22 a extracts the number band corresponding to the disaster area from the place data 11. Further, the change target determining means 22a extracts the telephone number including the extracted number band from the subscriber class data 13, and the subscriber service edge associated with the extracted telephone number from the subscriber service edge data 14. 2 identifier is obtained. Further, the change target determining means 22a extracts the telephone number associated with the acquired identifier of the subscriber service edge 2 from the subscriber service edge data 14, and extracts the telephone number extracted from the subscriber service edge data 14, Output as change target data 12a.

  For example, when the change target determining means 22a receives the identifier “A prefecture B city” of the affected area, the number band “xxxx-ax” corresponding to the affected area “A prefecture B city” and the number from the location data 11 The band “xxxx-bx” is acquired. Further, the change target determining unit 22 extracts a telephone number including the number band “xxxx-ax” and the number band “xxxx-bx” from the subscriber class data 13. When the subscriber number is connected after the number band, the change target determining unit 22 extracts the telephone number that matches the number band “xxxx-ax” or the number band “xxxx-bx” in front. .

  The subscriber service edge data 14a acquires the identifier of the subscriber service edge 2a associated with the extracted telephone number. In the example shown in FIG. 11, the subscriber service edge data 14a acquires the identifier of the first subscriber service edge 2a. Further, the subscriber service edge data 14a acquires a telephone number associated with the first subscriber service edge 2a. In the example shown in FIG. 1, the subscriber service edge data 14a acquires the telephone numbers of the first terminal 3a to the fourth terminal 3d and generates the change target data 12a.

  The change target data 12a is a telephone number of a terminal accommodated by a subscriber service edge that accommodates a terminal installed in a disaster area. In the example shown in FIG. 1, the first terminal 3a is installed in a disaster area. Accordingly, the change target determining means 22a specifies the first terminal 3a to the fourth terminal 3d as the terminals accommodated by the first subscriber service edge 2 accommodating the first terminal 3a, and sets each telephone number. Output as change target data 12a.

  With reference to FIG. 12, in the session control server 1a according to the first modification, a process related to the change of the subscriber class will be described.

  The processing from step S201 to step S205 in FIG. 12 is the same as the processing from step S101 to step S105 in FIG. Further, the processing from step S210 to step S213 in FIG. 12 is the same as the processing from step S108 to step S111 in FIG. Therefore, the processing from step S206 to step S209 will be described. When receiving the disaster area data, the session control server 1a identifies the number zone of the disaster area. If the session control server 1a accommodates a terminal having a telephone number including the number zone of the disaster area, the process proceeds to step S206.

  In step S <b> 206, the session control server 1 a extracts from the subscriber class data 13 a telephone number that starts with the number zone of the disaster area. In step S207, the session control server 1a extracts from the subscriber service edge data 14 an identifier of the subscriber service edge that accommodates the telephone number extracted in step S206. In step S208, the session control server 1a extracts the telephone number corresponding to the identifier of the subscriber service edge extracted in step S207 from the subscriber service edge data 14, and outputs it as the change target data 12a in step S209.

  Thereafter, the session control server 1a changes the telephone number of the change target data 12a to the disaster area general subscriber class X when the subscriber class is the general subscriber class GN. When the load on the session control server 1a is reduced, the disaster area general subscriber class X is returned to the general subscriber class GN.

  Thus, in the first modification, not only terminals located in the disaster area but also terminals accommodated by the subscriber service edge that accommodates terminals in the disaster area are targeted for change. Thereby, it is possible to preferentially call a highly urgent call over a wider range.

(Second modification)
In the second modification, a case where the subscriber class is raised for each session control server will be described.

  The session control server 1b according to the second modification is connected to the terminal 3 via the subscriber service edge 2 as in FIG. The session control server 1b accommodates the first terminal 3a to the sixth terminal 3f. Among these, when the first terminal 3a accommodated by the first subscriber service edge 2a is a terminal located in the disaster area, the session control server 1b targets all terminals accommodated by the session control server 1b for change. .

  The session control server 1b changes the subscriber class of the terminal of the general subscriber class GN among the change target terminals to the disaster area general subscriber class X. In the example shown in FIG. 13, the subscriber class of the first terminal 3a, the third terminal 3c, and the fifth terminal 3e among the terminals to be changed is the general subscriber class GN. Therefore, the session control server 1a changes the subscriber class of the first terminal 3a, the third terminal 3c, and the fifth terminal 3e to the disaster area general subscriber class X.

  Here, in the third terminal 3c and the fifth terminal 3e, the number band of the telephone number is “xxxx-cx”. As shown in FIG. 6, this number band corresponds to “A prefecture C city”. In the sixth modification, by changing the subscriber class in units of subscriber service edges, it is possible to deal with a wider area as the disaster area than the area that the weather server 9 lists as the disaster area.

  With reference to FIG. 14, the session control server 1b which concerns on a 2nd modification is demonstrated. The session control server 1b according to the second modification is different from the session control server 1 described with reference to FIG. 5 in that the storage device 10 does not include the location data 11 and the change target data 12, and the central processing. The difference is that the control device 20 does not include the change target determination means 22. Further, the processing of the class changing unit 23b is different.

  When any one of the terminals accommodated by the session control server 1b is located in the affected area, the class changing unit 23b is configured to select a terminal to which the general subscriber class GN is assigned among the terminals accommodated by the session control server 1b. Change to disaster area general subscriber class X.

  Thereby, the subscriber class of the terminal accommodated in the session control server 1b according to the second modified example is equal to or greater than the disaster area general subscriber class X. Therefore, the priority does not change when the session control server 1b determines whether to forward the outgoing call. However, as the subscriber class increases, outgoing calls from the affected area are preferentially received compared to outgoing calls from the non-affected area at the session control server that accommodates the destination terminal.

  With reference to FIG. 15, in the session control server 1b according to the second modification, a process related to the change of the subscriber class will be described.

  The processing from step S301 to step S305 in FIG. 15 is the same as the processing from step S101 to step S105 in FIG. Further, the processing from step S308 to step S311 in FIG. 12 is the same as the processing from step S108 to step S111 in FIG. Therefore, the process of step S306 and step S307 will be described. When receiving the disaster area data, the session control server 1b specifies the number zone of the disaster area. If the session control server 1b accommodates a terminal having a telephone number including the number zone of the disaster area, the process proceeds to step S306. In step S306, the session control server 1b extracts all telephone numbers from the subscriber class data 13, and outputs them as change targets in step S307.

  After that, for each telephone number to be changed, the session control server 1b changes to the affected area general subscriber class X when the subscriber class is the general subscriber class GN. When the load on the session control server 1b is reduced, the disaster area general subscriber class X is returned to the general subscriber class GN.

  As described above, in the second modified example, not only the terminal located in the disaster area but also the terminal accommodated by the subscriber service edge accommodating the terminal in the disaster area is set as the change target. Thereby, it is possible to preferentially call a highly urgent call over a wider range.

(Third Modification)
In the above embodiment, the case where the subscriber class is divided into four subscriber classes as shown in FIG. 2 has been described. In the third modification, as shown in FIG. 16, a case where the subscriber class is divided into three subscriber classes will be described.

  In the example shown in FIG. 16, the subscriber class “UR” is used as a public telephone class and a disaster area general subscriber class. In the third embodiment, the terminal of the general subscriber class GN in the disaster area is assigned the same subscriber class “UR” as the public telephone class.

  In this case, the class changing unit 23 of the session control server 1 according to the third modification holds list data of the changed telephone number when the subscriber class is changed due to a disaster. When the load value of the first session control server 1 held by the load monitoring unit 24 falls below a predetermined threshold value, the class changing unit 23 returns the telephone number of the list data to the original subscriber class, and joins it. User class data 13 is updated. The class changing means 23 reads the subscriber class data 13 and changes the public telephone class UR to the general subscriber class GN for the subscriber class of the telephone number included in the list data whose subscriber class has been changed.

  Here, another method of holding the telephone number whose subscriber class has been changed is conceivable. For example, a flag indicating that the subscriber class has been raised due to the disaster may be associated with the subscriber class data 13. The class changing means 23 updates the subscriber class data 13 by setting a flag to true for the telephone number whose subscriber class has been changed. Further, the subscriber class data 13 is read, and the subscriber class changes the public telephone class UR to the general subscriber class GN for the subscriber class of the telephone number whose flag is set to true.

  Thus, even if a new subscriber class is not created, the same effect as the above-described embodiment can be obtained by assigning the public telephone class UR as the disaster area general subscriber class.

(Other embodiments)
As described above, the embodiments of the present invention and the first to third modifications thereof have been described. However, it is understood that the description and drawings constituting a part of this disclosure limit the present invention. should not do. From this disclosure, various alternative embodiments, examples, and operational techniques will be apparent to those skilled in the art.

  For example, the communication system described in the embodiment of the present invention may include a device other than the device shown in FIG. In some cases, one device physically implements the functions of a plurality of devices.

  It goes without saying that the present invention includes various embodiments not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

1, 4 Session control server 2, 5 Subscriber service edge 3, 6 Terminal 7 Relay session control server 8 Regulatory monitoring server 9 Weather server 10 Storage device 11 Location data 12 Data to be changed 13 Subscriber class data 14 Subscriber service edge data DESCRIPTION OF SYMBOLS 20 Central processing control apparatus 21 SIP message control means 22 Change object determination means 23 Class change means 24 Load monitoring means 30 Communication control apparatus 100 Communication system

Claims (5)

A session control server for controlling a call of a terminal identified by a telephone number based on a subscriber class corresponding to the telephone number,
The telephone number includes a number band corresponding to an area where the terminal is located, and a subscriber number for identifying the terminal in the area,
The session control server connects to the terminal via a subscriber service edge;
Subscriber class data in which the telephone number of the terminal is associated with the subscriber class assigned to the telephone number;
Location data that associates the identifier of the area where the terminal controlled by the session control server is located with the number band corresponding to the area;
A storage device for storing subscriber service edge identifiers and subscriber service edge data in which terminal numbers accommodated by the subscriber service edge are associated with each other;
Upon receiving the identifier of the affected area, the number band corresponding to the affected area is extracted from the location data, the telephone number including the number band is extracted from the subscriber class data, and the subscriber service edge data From which the subscriber service edge identifier associated with the extracted telephone number is acquired, and the telephone number associated with the acquired subscriber service edge identifier is extracted from the subscriber service edge data. A change target determining means for outputting the telephone number extracted from the subscriber service edge data as change target data;
Class changing means for updating a subscriber class data by raising a subscriber class corresponding to at least a part of telephone numbers of the data to be changed;
A session control server comprising: Load monitoring means for holding the load value of the session control server,
When the load value falls below a predetermined threshold,
2. The session control server according to claim 1 , wherein the class changing unit further returns the telephone number for which the subscriber class has been raised to the original subscriber class and updates the subscriber class data. 3. A communication system comprising a session control server for controlling a call of a terminal identified by a telephone number based on a subscriber class corresponding to the telephone number, and a regulation monitoring server connected to the session control server,
The telephone number includes a number band corresponding to an area where the terminal is located, and a subscriber number for identifying the terminal in the area,
The session control server connects to the terminal via a subscriber service edge;
The regulation monitoring server sequentially connects to a weather server that provides information on a disaster area at the time of a disaster, acquires disaster area data including an identifier of the disaster area, and transmits the disaster area data to the session control server With local transmission means,
The session control server
Subscriber class data in which the telephone number of the terminal is associated with the subscriber class assigned to the telephone number;
Location data that associates the identifier of the area where the terminal controlled by the session control server is located with the number band corresponding to the area;
A storage device for storing subscriber service edge identifiers and subscriber service edge data in which terminal numbers accommodated by the subscriber service edge are associated with each other;
Upon receipt of the affected areas data from the regulatory oversight server, from the plant data, the disaster to extract the number band corresponding to the region, said from the subscriber class data, to extract the phone number, including the number band, the The subscriber service edge identifier associated with the extracted telephone number is acquired from the subscriber service edge data, and the telephone associated with the acquired subscriber service edge identifier from the subscriber service edge data. A change target determining means for extracting a number and outputting the telephone number extracted from the subscriber service edge data as change target data;
Class change means for updating a subscriber class data by raising a subscriber class corresponding to at least a part of telephone numbers of the change target data. A communication method used in a communication system comprising: a session control server that controls a call of a terminal identified by a telephone number based on a subscriber class corresponding to the telephone number; and a regulation monitoring server connected to the session control server Because
The telephone number includes a number band corresponding to an area where the terminal is located, and a subscriber number for identifying the terminal in the area,
The session control server connects to the terminal via a subscriber service edge;
The regulation monitoring server sequentially connects to a weather server that provides information on a disaster area at the time of a disaster, acquires disaster area data including an identifier of the disaster area, and transmits the disaster area data to the session control server When,
When the session control server receives the disaster area data from the regulatory monitoring server, from the location data that associates the identifier of the area where the terminal controlled by the session control server is located with the number band corresponding to the area The number band corresponding to the affected area is extracted, and the telephone number including the number band is extracted from the subscriber class data in which the telephone number of the terminal is associated with the subscriber class assigned to the telephone number. Thus, the subscriber service edge associated with the telephone number extracted from the subscriber service edge data in which the identifier of the subscriber service edge is associated with the telephone number of the terminal accommodated by the subscriber service edge. An identifier is acquired and is associated with the acquired subscriber service edge identifier from the subscriber service edge data. A step of extracting and outputting the telephone number, the telephone number extracted from the subscriber service edge data, as a change target data,
The session control server includes a step of updating a subscriber class data by raising a subscriber class corresponding to at least a part of telephone numbers of the change target data. The session control server holds a load value of the session control server;
When the load value falls below a predetermined threshold, the session control server further comprises a step of returning the telephone number for which the subscriber class has been raised to the original subscriber class and updating the subscriber class data. The communication method according to claim 4.

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