JP2016042648A - Communication system, resource management device, and communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow congestion to be quickly eliminated even when the shortage of communication resources occurs at both of a calling side and a called side.SOLUTION: A communication system includes: a division unit that divides communication resources for call origination per communication area into first communication resources and second communication resources, and divides communication resources for call incoming per communication area into third communication resources and fourth communication resources; a storage unit that stores the identifier of a first terminal and the identifier of a called side second terminal in response to call origination from the first terminal if the first communication resources of first communication area in the calling side or the third communication resources of second communication area in the called side are short; a regulation unit that regulates call origination from the first terminal; and a connection unit that, in response to the occurrence of vacancy in the fourth communication resources in the second communication area, connects communication between the first terminal and the second terminal using the second communication resources in the first communication area and the fourth communication resources on the basis of the identifiers stored in the storage unit.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a communication system, a resource management device, and a communication method.

  In the event of a disaster, a large number of calls such as safety confirmations occur between the non-stricken area and between the stricken area and the stricken area. Congestion occurs due to lack of communication resources such as lines. As one approach for avoiding deterioration in connection quality of a call service due to congestion, methods for restricting outgoing calls of terminals have been studied, and some methods have been introduced in communication carriers.

  For example, a communication carrier has introduced a technique (hereinafter referred to as “% regulation”) that periodically prohibits calls from some terminals in response to an increase in the load on call processing of communication facilities and the scale of disasters. (For example, refer to Patent Document 1, Non-Patent Document 1, etc.).

  FIG. 1 is a diagram for explaining the% restriction. The% restriction is a method of managing a terminal group existing in a minimum unit area for specifying the location of the terminal by dividing it into a plurality of groups and restricting outgoing calls by the terminal unit. FIG. 1 shows an example in which a terminal group is divided into 10 groups and managed.

  The group to be regulated changes at regular intervals, and the regulation information for regulating outgoing calls is transmitted from the radio base station (BTS) to terminals belonging to the group to be regulated. FIG. 1 shows a state where regulation is performed for 50% of groups 2 to 6.

  % Regulation regulates terminal call origination for a certain period of time, equalizing the chances that terminals can make calls, reducing the load associated with call processing of communication equipment, reducing the call processing performance and functions of communication equipment The purpose is to avoid outages. However, since the terminal cannot know the timing of regulation and the use of unused line resources is in the order in which calls are accepted, there is a possibility that some terminals may occupy the line for a long time. There is a possibility that fairness among terminals regarding the number may be lost. For example, there is a possibility that a terminal in which communication is successful many times occurs while a terminal in which communication is never successful.

  Therefore, paying attention to the unfairness of the number of lines used, we succeeded in communication connection based on the assumption that “there are many users who have a small number of communication partners such as family members and friends” at the time of disaster. For terminals, the number of terminals that can be re-called by meeting the call request of a small number of terminals at an early stage by temporarily restricting subsequent calls and making it easy to connect terminals that have not successfully communicated. A technique for reducing congestion and eliminating congestion at an early stage (hereinafter referred to as “successful terminal regulation”) has been studied (for example, see Non-Patent Document 2).

JP-A-8-317471

Masanori Ito, “NTT DOCOMO's Disaster Management Efforts to Distribute Information Using Mobile Phones”, Digital Broadcasting Research Group 2nd Study Group, Jun. 2007 Toshiaki Shiozu, Toshiaki Tsuchiya, Haruhisa Hasegawa, "Evaluation of congestion elimination effect by call control method using communication history", IEICE Sodai, B-6-81, Mar. 2013

  However, the successful terminal regulation is intended for control of outgoing calls from non-stricken area terminals to the stricken area, and assumes that communication resources on the calling side are not insufficient. Therefore, it is considered that the effect at the time of applying the successful terminal regulation is different between the call from the non-stricken area to the stricken area and the call between the stricken areas. That is, when successful terminal regulation is applied for calls between disaster-stricken areas, it is assumed that many call losses occur due to a lack of communication resources on the calling side. It is expected that the time required until the communication of the arrival / departure terminal becomes longer and the effect of shortening the congestion time is reduced.

  The present invention has been made in view of the above points, and an object of the present invention is to make it possible to quickly eliminate congestion even when a shortage of communication resources occurs on both the calling side and the called side.

  Therefore, in order to solve the above problems, the present invention divides a communication resource for outgoing call for each call area of a mobile communication network into a first communication resource and a second communication resource, and A dividing unit that divides the communication resource into a third communication resource and a fourth communication resource, and in response to a call from the first terminal, the first call area of the first call area on the caller side of the call Communication resource and at least one of the third communication resources in the second call area on the call arrival side is insufficient, the identifier of the first terminal and the call reception on the call A first storage unit that stores an identifier of the second terminal on the side, a regulation unit that regulates outgoing calls from the first terminal in which the identifier is stored in the first storage unit, and the second The fourth communication resource in the call area of The communication between the first terminal and the second terminal based on the identifier stored in the first storage unit and the second communication resource in the first call area And a connection unit connected using the fourth communication resource.

  Even when a shortage of communication resources occurs on both the calling side and the called side, congestion can be resolved early.

It is a figure for demonstrating% regulation. It is a figure which shows the structural example of the communication system in embodiment of this invention. It is a figure which shows the hardware structural example of the resource management apparatus in embodiment of this invention. It is a figure which shows the function structural example of the resource management apparatus and communication apparatus in embodiment of this invention. It is a sequence diagram for demonstrating an example of the process sequence performed at the time of starting of a resource management apparatus. It is a figure which shows the structural example of a resource information storage part. It is a figure which shows the structural example of a communication request information storage part. It is a sequence diagram for demonstrating an example of the process sequence performed according to the call from a terminal. It is a figure which shows the structural example of the call loss list | wrist with respect to one communication apparatus. It is a sequence diagram for demonstrating an example of the process sequence performed according to the outgoing call based on a call loss list. It is a flowchart for demonstrating an example of the process sequence which a dedicated resource control part performs. It is a flowchart for demonstrating an example of the process sequence performed when a terminal information control part receives the calling information from a session management apparatus. It is a flowchart for demonstrating an example of the process sequence performed when a terminal information control part receives the call information regarding the successful call from the call loss terminal connection part. It is a flowchart for demonstrating an example of the process sequence which a call loss terminal connection part performs. It is a figure for demonstrating the conditions of the simulation for evaluation of this Embodiment. It is a figure which shows the state transition which a terminal implements in the simulation for evaluation of this Embodiment. It is a figure which shows transition of the number of terminals in action in each of case A and case B.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 2 is a diagram illustrating a configuration example of a communication system according to the embodiment of the present invention. In FIG. 2, the communication system 1 is a system related to mobile communication, and includes a calling-side area As, a called-side area Ar, a session management device 20, a resource management device 10, and the like.

  The calling side area As is a calling side call area in the present embodiment. The called-side area Ar is a calling-side call area in the present embodiment. Note that the originating side and the terminating side are only a relative relationship. Therefore, it may be called in the calling side area As or may be called in the called side area Ar. Further, when the departure side area As and the arrival side area Ar are not distinguished, they are simply referred to as “area”. The area is a minimum unit range for specifying the location of the terminal.

  Each area includes one or more terminals 50, a base station 40, a communication device 30, and the like. The terminal 50 is a mobile terminal used for a call using a mobile communication network, such as a feature phone, a smartphone, or a tablet terminal. The base station 40 is a base station 40 in a mobile communication network. That is, the base station 40 is located at the end of the mobile communication network and directly communicates with the terminal 50. The communication device 30 is a communication facility including an exchange or the like. Each base station 40 is connected to the communication device 30. Note that “s” is added to the end of the code of each device included in the calling-side area As, and “r” is added to the end of the code of each device included in the called-side area Ar.

  In response to a call from any of the terminals 50, the session management device 20 instructs the communication devices 30 on the outgoing side and the incoming side of the outgoing call to assign communication resources, and performs communication related to the outgoing call. A computer that controls connections.

  The resource management device 10 executes a process for quickly eliminating congestion in the mobile terminal network when both the terminal 50s in the calling area As and the terminal 50r in the landing area Ar are affected areas. It is.

  Note that the session management device 20 and the resource management device 10 are communicably connected to each communication device 30 via a network or the like.

  FIG. 3 is a diagram illustrating a hardware configuration example of the resource management device according to the embodiment of the present invention. The resource management device 10 in FIG. 3 includes a drive device 100, an auxiliary storage device 102, a memory device 103, a CPU 104, an interface device 105, and the like that are mutually connected by a bus B.

  A program for realizing processing in the resource management apparatus 10 is provided by a recording medium 101 such as a CD-ROM. When the recording medium 101 storing the program is set in the drive device 100, the program is installed from the recording medium 101 to the auxiliary storage device 102 via the drive device 100. However, the program need not be installed from the recording medium 101 and may be downloaded from another computer via a network. The auxiliary storage device 102 stores the installed program and also stores necessary files and data.

  The memory device 103 reads the program from the auxiliary storage device 102 and stores it when there is an instruction to start the program. The CPU 104 executes a function related to the resource management device 10 according to a program stored in the memory device 103. The interface device 105 is used as an interface for connecting to a network.

  FIG. 4 is a diagram illustrating a functional configuration example of the resource management device and the communication device according to the embodiment of the present invention. In FIG. 4, the resource management apparatus 10 includes a dedicated resource control unit 11, a terminal information control unit 12, a call loss terminal connection unit 13, and the like. Each of these units is realized by processing executed by the CPU 104 by a program installed in the resource management apparatus 10. Alternatively, these units may be realized by hardware such as a circuit. The resource management apparatus 10 also uses a communication request information storage unit 111, a call loss list storage unit 112, a disaster area list storage unit 113, and the like. Each of these storage units can be realized using a storage device connected to the auxiliary storage device 102 or the resource management device 10 via a network.

  The dedicated resource control unit 11 divides the communication resources of the communication device 30 in each area (hereinafter referred to as “stricken area”) into general-purpose resources and dedicated resources. Specifically, the dedicated resource control unit 11 calculates the upper limit value of the dedicated resource of the communication device 30 in the disaster area. In the present embodiment, the dedicated resource refers to a communication resource used for a call that is lost between the affected areas. A generic resource refers to a communication resource used for a call other than a call for which a dedicated resource is used. For example, the general-purpose resource is used for a call in which at least one of the calling side and the called side is a non-disaster area. Note that the communication resource is, for example, the number of lines, a frequency band, or the like. Further, the communication device 30 in the disaster area can be specified by referring to the disaster area list storage unit 113. That is, the identifier of the communication device 30 in the disaster area is stored in the disaster area list storage unit 113 in accordance with, for example, an operation by the operator.

  The dedicated resource control unit 11 calculates the upper limit value of the dedicated resource for each fixed period based on the communication request information stored in the communication request information storage unit 111. Note that calculating the upper limit value of the dedicated resource also calculates the upper limit value of the general-purpose resource. This is because the sum of the upper limit value of the dedicated resource of a certain communication device 30 and the upper limit value of the general-purpose resource is the upper limit value of the communication resource of the communication device 30.

  The communication request information storage unit 111 stores communication request information for each of the communication device 30 on the call origination side and the communication device 30 on the arrival side in which at least one of the call origination side and the arrival side is a disaster area. The communication request information includes the number of incoming terminals and the number of outgoing terminals of each communication device 30.

  The terminal information control unit 12 regulates the call of the terminal 50 on the caller side when the call loss occurs for the call where both the caller side and the callee side are the disaster area, and the caller related to the call loss. Information related to the call (calling information) is registered in the call loss list storage unit 112. The call loss list storage unit 112 stores a call loss list for each communication device 30. The call information is registered in a call loss list corresponding to the communication device 30 on the call receiving side of the call related to the call loss.

  Based on the call information registered in the call loss list storage unit 112, the call loss terminal connection unit 13 establishes communication connection between the caller terminal 50 and the callee terminal 50 related to the call information. Request to session management device 20. When the communication connection is successful, the call information is deleted from the call loss list, and the call restriction of the caller terminal 50 related to the call information is released. The call loss terminal connection unit 13 also transmits the communication device 30 on the caller side of the call and the communication on the callee side based on the information notified from the session management device 20 and indicating the success or failure of the call from the terminal 50. The communication request information of each device 30 is updated.

  On the other hand, each communication device 30 includes a resource information transmission unit 31, a resource setting unit 32, a resource allocation control unit 33, and the like. Each of these units is realized by processing that a program installed in the communication device 30 causes the CPU of the communication device 30 to execute. Alternatively, these units may be realized by hardware such as a circuit. The communication device 30 also uses the resource information storage unit 301. These resource information storage units 301 can be realized by using an auxiliary storage device of the communication device 30 or a storage device connected to the communication device 30 via a network.

  The resource information transmission unit 31 refers to the resource information stored in the resource information storage unit 301 and notifies the resource management device 10 of the resource availability. The resource information is information including upper limit values and usage values of dedicated resources and general-purpose resources.

  The resource setting unit 32 sets the upper limit value of the dedicated resource calculated by the dedicated resource control unit 11 of the resource management apparatus 10 and the upper limit value of the general resource specified by the upper limit value of the dedicated resource in the resource information storage unit 301. To do.

  When the resource allocation control unit 33 receives an inquiry from the session management device 20 about whether or not to allocate resources, it responds based on the resource information.

  Hereinafter, a processing procedure executed in the communication system 1 will be described. The processing procedure in the present embodiment becomes effective when, for example, a list of communication devices 30 in a disaster area is registered in the disaster area list storage unit 113 of the resource management apparatus 10 by an operator when a disaster occurs.

  FIG. 5 is a sequence diagram for explaining an example of a processing procedure executed when the resource management apparatus is activated. The resource management device 10 is activated when a disaster occurs, for example.

  In response to the activation of the resource management device 10, the dedicated resource control unit 11 transmits a resource information acquisition request to the communication device 30 in each disaster area (S101). The communication device 30 in each disaster area can be specified based on the identifier of each communication device 30 stored in the disaster area list storage unit 113.

  The resource information transmission unit 31 of each communication device 30 that has received the acquisition request returns the resource information stored in the resource information storage unit 301 of the communication device 30 (S102).

  FIG. 6 is a diagram illustrating a configuration example of the resource information storage unit. In FIG. 6, the resource information storage unit 301 includes an upper limit value RGR and a use value Rgr of the called-side general resource, an upper limit value RSR and a used value Rsr of the called-side dedicated resource, an upper limit value SGR and a used value Sgr of the calling-side general resource, In addition, resource information including the upper limit value SSR and the use value Ssr of the dedicated resource on the calling side is stored.

  The called-side generic resource is a generic resource for incoming calls. In the present embodiment, the unit of the upper limit value and the usage value of the communication resource is the number of terminals. That is, for example, the upper limit value is the upper limit value of the number of terminals that can use the communication resource, and the use value is the number of terminals 50 that are using the communication resource.

  The called-side dedicated resource is a dedicated resource for incoming calls. The calling-side general resource refers to a general-purpose resource for transmission. The calling-side dedicated resource refers to a calling dedicated resource.

  Before the disaster occurs, that is, before the processing of FIG. 5 is executed, the called-side general-purpose resource upper limit value RGR matches the upper limit value of the incoming communication resource of the communication device 30. In addition, the calling-side general-purpose resource upper limit value SGR matches the upper limit value of the communication resource for outgoing call of the communication device 30. In other words, the destination-side dedicated resource upper limit value RSR and the calling-side dedicated resource upper limit value SSR are both 0 before the occurrence of the disaster.

  Subsequently, the dedicated resource control unit 11 transmits initial values of the destination-side dedicated resource upper limit value RSR and the originating-side dedicated resource upper limit value SSR to each communication device 30 in the disaster area (S103). The initial value of each communication device 30 is determined based on, for example, the called-side general-purpose resource upper limit value RGR or the originating-side general-purpose resource upper limit value SGR of each communication device 30. For example, the initial value of the destination-side dedicated resource upper limit value RSR is 50% of the called-side general-purpose resource upper limit value RGR, and the initial value of the calling-side dedicated resource upper limit value SSR is 50% of the calling-side dedicated resource upper limit value SGR. Is done.

  In response to receiving the initial value, the resource setting unit 32 of each communication device 30 updates the resource information stored in the resource information storage unit 301 (S104). Specifically, each of the destination dedicated resource upper limit value RSR and the destination dedicated resource upper limit value RSR of the resource information is updated with the received initial value. In addition, the updated destination-side dedicated resource upper limit value RSR is subtracted from the destination-side general-purpose resource upper limit value RGR of the resource information. In addition, the updated dedicated resource upper limit value SSR is subtracted from the originating general resource upper limit value SGR of the resource information. As a result, the communication resources on the called side and the calling side of each communication device 30 are divided into general-purpose resources and dedicated resources.

  The dedicated resource control unit 11 of the resource management apparatus 10 waits for a predetermined time after the execution of step S103 (S105). After waiting for a certain time, the dedicated resource control unit 11 acquires the communication request information of each communication device 30 belonging to the disaster area from the communication request information storage unit 111, and based on the communication request information, each communication device 30 Each of the destination-side dedicated resource upper limit value RSR and the originating-side dedicated resource upper limit value SSR is calculated (S106).

  FIG. 7 is a diagram illustrating a configuration example of the communication request information storage unit. As shown in FIG. 7, the communication request information storage unit 111 includes a communication device 30 on a call origination side and a communication device 30 on a callee side where at least one of the caller side and the callee side is a disaster area. Stores communication request information.

The communication request information includes the number of non-stricken area receiving terminals NT _i , the number of affected area receiving terminals T _i , the number of non-stricken area transmitting terminals nt _i , and the number of disaster-stricken area transmitting terminals t _i . Here, i is an identifier of each communication device 30 belonging to the disaster area.

The non-stricken area receiving terminal number NT _i is the number of terminals 50 that have successfully received a call from the terminal 50 belonging to the disaster area in the area of the communication apparatus 30 _i when the communication apparatus 30 _i belongs to the non-stricken area. It is.

The number of affected area receiving terminals T _i is the number of terminals that have successfully received calls from the terminals 50 belonging to the affected area or the non-affected area in the area of the communication apparatus 30 _i when the communication apparatus 30 _i belongs to the affected area. A number of 50.

The non-stricken area transmission terminal number nt _i is the number of terminals 50 that have successfully made a call to the terminal 50 belonging to the disaster area in the area of the communication apparatus 30 _i when the communication apparatus 30 _i belongs to the non-stricken area. is there. Successful call origination means that communication is connected for the originated call.

The number ti of the disaster area transmitting terminals indicates that the terminal 50 that has successfully made a call to the terminal 50 belonging to the disaster area or the non-disaster area in the area of the communication apparatus 30 _i when the communication apparatus 30 _i belongs to the disaster area. Is the number of

Note that the initial values of the non-stricken area receiving terminal number NT _i , the stricken area receiving terminal number T _i , the non-stricken area transmitting terminal number nt _i , and the stricken area transmitting terminal number t _i are all 0. Therefore, the values of these parameters in step S106 are values measured in a certain time waiting in step S105.

  The calculation of the destination-side dedicated resource upper limit value RSR and the calling-side dedicated resource upper limit value SSR based on the communication request information including such parameters is performed as follows, for example.

First, the dedicated resource control unit 11 determines, for the communication device 30i, the number of non-stricken area transmitting terminals nt _i , the number of disaster-stricken area transmitting terminals t _i , the number of non-stricken area receiving terminals NT _i , and the The average value of the number of incoming terminals T _i is calculated.

When the fixed time is “time (seconds)”, the average value of the number of non-stricken area transmission terminals nt _i is calculated by nt _i / time. The average value of the number of affected area transmitting terminals t _i is calculated by t _i / time. The average value of the number of non-stricken area incoming terminals NT _i is calculated by NT _i / time. The average value of the number of affected area incoming terminals T _i is calculated by T _i / time.

Subsequently, the dedicated resource control unit 11 determines the difference between the average value of the number of non-stricken area transmitting terminals nt _{i and} the originating general-purpose resource upper limit SGR (hereinafter referred to as “originating general-purpose difference”), the number of disaster-stricken area transmitting terminals. The difference between the average value of t _i and the calling-side dedicated resource upper limit value SSR (hereinafter referred to as “calling-side dedicated difference”), the average value of the number of non-disaster area destination terminals NT _i and the called-side general-purpose resource upper limit value RGR the difference (hereinafter referred to as "call-in general-purpose difference".), the difference between the average value of the affected areas receiving terminal number T _i and the receiving-side-only resource upper limit value RSR (hereinafter referred to as "call-in only difference.") of the respective calculate.

  When the calling-side general difference is less than 1 and the calling-side dedicated difference is 1 or more, the dedicated resource control unit 11 decreases the calling-side dedicated resource upper limit SSR by 1. When the calling-side general difference is 1 or more and the calling-side dedicated difference is less than 1, the dedicated resource control unit 11 increases the calling-side dedicated resource upper limit SSR by 1. Similarly, when the called-side general-purpose difference is less than 1 and the called-side dedicated difference is 1 or more, the dedicated resource control unit 11 decreases the called-side dedicated resource upper limit RSR by 1. When the called-side general difference is 1 or more and the called-side dedicated difference is less than 1, the dedicated resource control unit 11 increases the called-side dedicated resource upper limit RSR by 1.

  That is, the upper limit value of a communication resource having a relatively large margin is decreased, and the upper limit value of a communication resource having a relatively small margin is increased.

The update of each upper limit value includes the average usage of the originating general resource, the average usage of the calling dedicated resource, the average usage of the called general resource, and the average usage of the called dedicated resource for the communication device 30i. May be used. In this case, the communication request information includes, in place of the non-stricken area transmitting terminal number nt _i , the stricken area transmitting terminal number t _i , the non-stricken area receiving terminal number NT _i , and the stricken area receiving terminal number T _i , The number of times of resource use, the number of times of use of the originating side dedicated resource, the number of times of use of the destination side general resource, and the number of times of use of the destination side dedicated resource may be included. The number of uses of the calling-side general resource of the communication device 30 i is incremented by one every time the calling-side general resource of the communication device 30 i is assigned in response to a call from the terminal 50. The number of times of use of the caller-side dedicated resource of the communication device 30i is incremented by 1 every time the caller-side dedicated resource of the communication device 30i is allocated in response to a call from the resource management device 10. The number of times of use of the called general resource of the communication device 30i is incremented by one every time the called general resource of the communication device 30i is allocated in response to a call from the terminal 50. The number of times of use of the dedicated resource on the receiving side of the communication device 30 i is incremented by one every time the dedicated resource on the receiving side of the communication device 30 i is allocated in response to a call from the resource management device 10. The average usage amount of each usage count is obtained by dividing each usage count by time.

  Following step S106, the dedicated resource control unit 11 transmits the calling side dedicated resource upper limit value SSR and the called side dedicated resource upper limit value RSR calculated for each communication device 30i to each communication device 30i (S107). The resource setting unit 32 of the communication device 30i updates the resource information stored in the resource information storage unit 301 with the received value (S108). The method for updating resource information may be the same as in step S104.

  Subsequently, the dedicated resource control unit 11 initializes the value of each parameter of the communication request information stored in the communication request information storage unit 111 regarding the communication device 30i to 0.

  Steps S106 to S109 are executed for each communication device 30 belonging to the disaster area. Subsequently, step S105 and subsequent steps are repeated (S110).

  As described above, the calling-side dedicated resource upper limit value SSR and the called-side dedicated resource upper limit value RSR of each communication device 30 are updated at regular intervals according to the success status of the outgoing call or incoming call in each communication device 30. .

  Next, a processing procedure executed when the terminal 50s in the calling side area As makes a call will be described. FIG. 8 is a sequence diagram for explaining an example of a processing procedure executed in response to a call from a terminal.

  When any terminal 50s in the calling side area As calls (S201), the call is notified to the session management device 20 via the base station 40s and the communication device 30s (S202).

  The session management device 20 transmits an inquiry as to whether or not communication resources can be allocated to the communication device 30s that originates the call (S203). The inquiry includes information indicating that the allocation target is the communication resource on the calling side, and that the communication resource is allocated by the call of the terminal 50.

  When the resource allocation control unit 33 of the communication device 30 s receives the inquiry, the resource allocation control unit 33 determines whether the inquiry is an inquiry about the communication resource on the calling side and is an allocation of the communication resource by the call of the terminal 50. Referring to storage unit 301, it is determined whether or not calling general resource upper limit value SGR−calling general resource use value Sgr ≧ 1 (S204). That is, it is determined whether or not there is a vacancy in the calling general resource. Subsequently, the resource allocation control unit 33 returns a determination result indicating whether allocation is possible or not to the session management apparatus 20 (S205).

  The session management device 20 also transmits an inquiry as to whether or not communication resources can be allocated to the communication device 30r on the call arrival side (S206). The inquiry includes information indicating that the allocation target is the communication resource on the called side and that the communication resource is allocated by the terminal 50 calling.

  When the resource allocation control unit 33 of the communication device 30r receives the inquiry, the resource allocation control unit 33 determines whether the inquiry is an inquiry about the communication resource on the called side and the allocation of the communication resource by the call of the terminal 50. With reference to the storage unit 301, it is determined whether or not the destination-side general resource upper limit value RGR−the destination-side general resource use value Rgr ≧ 1 (S207). That is, it is determined whether or not there is a vacancy in the called general resource. Subsequently, the resource allocation control unit 33 returns a determination result indicating whether allocation is possible or not to the session management apparatus 20 (S208).

  Note that steps S203 to S205 and steps S206 to S208 may be executed in parallel or in series. When executed in series, if the determination result related to the query executed earlier indicates that allocation is not possible (insufficient communication resources), the other query may not be executed.

  When both determination results indicate that allocation is possible, the session management device 20 transmits a connection request regarding the call to each of the communication device 30s and the communication device 30r (S209, S211). The resource allocation control unit 33 of the communication device 30s allocates one calling-side general-purpose resource for the call (S210). Accordingly, 1 is added to the calling-side general-purpose resource usage value Sgr. Further, the resource allocation control unit 33 of the communication device 30r allocates one called-side general-purpose resource for the call (S212). Therefore, 1 is added to the called-side general-purpose resource usage value Rgr.

  Subsequently, the session management device 20 transmits information indicating success or failure of communication connection and call information to the terminal information control unit 12 of the resource management device 10 (S213). The call information includes the respective identifiers of the terminal 50s and the communication device 30s on the calling side, the respective identifiers of the terminal 50r and the communication device 30r on the called side, and information indicating the success or failure of the call.

  Both the identifier of the communication device 30s on the calling side and the identifier of the communication device 30r on the called side are included in the received call information, and information indicating a communication connection failure (ie, call loss) is received. Is stored in the disaster area list storage unit 113 (that is, in the case of a call between the disaster area areas), the terminal information control unit 12 stores the call information in the call loss list storage unit 112. The call loss list is registered in the call loss list corresponding to the communication device 30r on the called side (S214). That is, the call loss list is stored for each communication device 30r on the call receiving side of the call that has been lost. In addition, each call loss list includes call information related to call loss in a call that is a disaster-stricken area on both the calling side and the called side.

  FIG. 9 is a diagram illustrating a configuration example of a call loss list for one communication apparatus. FIG. 9 shows a call loss list including three entries. One entry in the call loss list is generated based on one call information. The entry includes a calling terminal identifier, a calling communication apparatus identifier, a called terminal identifier, a confirmation flag, and the like. The calling terminal identifier is an identifier (for example, a telephone number) of the calling terminal 50s. The originating communication device identifier is an identifier of the originating communication device 30s. The called terminal identifier is an identifier (for example, a telephone number) of the called terminal 50r. The confirmation flag is a flag used to fairly process each entry in one call loss list. The call loss list is collected for each identifier of the communication device 30 on the called side (called communication device identifier on the called side). Therefore, as shown in FIG. 9, each entry in the call loss list may not include the identifier of the communication device 30 on the called side.

  Subsequently, the terminal information control unit 12 notifies the calling terminal 50s that the call has been lost via the communication device 30s and implements call restriction on the terminal 50s (S215, S216). The call restriction may be performed, for example, by transmitting information indicating that the call is restricted to the terminal 50s. The terminal 50s interprets the information and refuses to execute the call even if a call instruction is input by the user.

  On the other hand, at least one of the identifier of the originating communication device 30 s and the identifier of the terminating communication device 30 r included in the received call information is received and information indicating the success of the communication connection is received. When stored in the disaster area list storage unit 113, the terminal information control unit 12 updates the communication request information regarding each of the originating communication device 30s and the terminating communication device 30r (S217).

Specifically, assuming that the communication device 30s is the communication device 30i and the communication device 30r is the communication device 30j, 1 is added to t _i when the communication device 30i belongs to the disaster area. On the other hand, when the communication device 30i belongs to the non-disaster area, 1 is added to nt _i . When the communication device 30j belongs to the affected areas area, 1 is added to T _j. On the other hand, when the communication device 30j belongs to the non-disaster area, 1 is added to NT _j .

  Subsequently, a processing procedure executed when a call is made from the resource management device 10 based on the call loss list will be described. FIG. 10 is a sequence diagram for explaining an example of a processing procedure executed in response to a call based on the call loss list.

  The resource information transmitting unit 31 of each communication device 30 whose destination side dedicated resource upper limit value RSR is 1 or more is monitoring the destination side dedicated resource use value Rsr of the communication device 30 and the destination side dedicated resource use value. When Rsr decreases (when a free space is generated in the called side dedicated resource), the free resource amount (RSR-Rgr) of the called side dedicated resource is transmitted to the call loss terminal connection unit 13 of the resource management device 10. FIG. 5 shows an example in which the free resource amount is transmitted by the communication device 30r (S301).

  When the call loss terminal connection unit 13 receives the free resource amount, the value of the confirmation flag is 0 from the call loss list stored in the call loss list storage unit 112 regarding the communication device 30r that is the transmission source of the free resource amount. The call information included in the entry is acquired (S302). When one or more pieces of corresponding call information are acquired, the call loss terminal connection unit 13 updates the value of the confirmation flag of the entry of the call information to 1. If the confirmation flag values of all entries are 1, the confirmation flag values of all entries are updated to 0, and then step S302 is executed. When a plurality of corresponding call information is acquired in step S302, one of the plurality of call information is selected, and step S303 and subsequent steps are executed. Hereinafter, the selected call information is referred to as “target call information”.

  Subsequently, the call loss terminal connection unit 13 inquires of the communication device 30s related to the caller communication device identifier included in the target call information about the availability of the caller side dedicated resource (S303). In response to the inquiry, the resource information transmitting unit 31 of the communication device 30s calculates the calling side dedicated resource upper limit value SSR−the calling side dedicated resource usage value Ssr (that is, the free resource amount of the calling side dedicated resource) (S304). . Subsequently, the resource information transmission unit 31 returns the calculation result to the call loss terminal connection unit 13 (S305).

  The call loss terminal connection unit 13 makes a call to the session management device 20 when the received resource free amount indicates a value of 1 or more (that is, when the caller-side dedicated resource has a free space) (S306). ). In the call, the terminal 50 related to the calling terminal identifier included in the target call information is the calling terminal 50s, and the terminal 50 related to the called terminal identifier is the called terminal 50r.

  In response to the call from the call loss terminal connection unit 13, the session management device 20 transmits an inquiry as to whether or not communication resources can be allocated to the communication device 30s on the call origination side (S307). The inquiry includes information indicating that the allocation target is the resource on the calling side and that the communication resource is allocated by a call from the resource management apparatus 10.

  When the resource allocation control unit 33 of the communication device 30 s receives the inquiry, the resource allocation control unit 33 responds that the inquiry is an inquiry about the communication resource on the calling side and the communication resource is allocated by the call of the resource management device 10. Referring to the resource information storage unit 301, it is determined whether or not the calling side dedicated resource upper limit value SSR−the calling side dedicated resource use value Ssr ≧ 1 (S308). That is, it is determined whether or not there is a vacancy in the calling-side dedicated resource. Subsequently, the resource allocation control unit 33 returns a determination result indicating whether allocation is possible or not to the session management apparatus 20 (S309).

  The session management apparatus 20 also transmits an inquiry as to whether or not communication resources can be allocated to the communication apparatus 30r that receives the call (S310). The inquiry includes information indicating that the allocation target is the communication resource on the called side and the allocation of the communication resource by the call of the resource management device 10.

  When the resource allocation control unit 33 of the communication device 30r receives the inquiry, the resource allocation control unit 33 responds that the inquiry is an inquiry about the communication resource on the called side and the communication resource is allocated by a call from the resource management device 10. Referring to the resource information storage unit 301, it is determined whether or not the destination dedicated resource upper limit value RSR−the destination dedicated resource use value Rsr ≧ 1 (S311). That is, it is determined whether or not there is a vacancy in the destination-side dedicated resource. Subsequently, the resource allocation control unit 33 returns a determination result indicating whether allocation is possible or not to the session management apparatus 20 (S312).

  Note that steps S307 to S309 and steps S310 to S312 may be executed in parallel or in series. When executed in series, if the determination result related to the query executed earlier indicates that allocation is not possible (insufficient communication resources), the other query may not be executed.

  If both determination results indicate that assignment is possible, the session management device 20 transmits a connection request regarding the call to each of the communication device 30s and the communication device 30r (S313, S315). The resource allocation control unit 33 of the communication device 30s allocates one calling side dedicated resource to the call (S314). Accordingly, 1 is added to the calling-side dedicated resource usage value Ssr. Further, the resource allocation control unit 33 of the communication device 30r allocates one destination-side dedicated resource to the call (S316). Accordingly, 1 is added to the destination-side dedicated resource usage value Rgr. Note that the communication device 30s may call the calling terminal 50s, and the communication device 30r may call the called terminal 50r. By doing so, each of the user of the terminal 50s and the user of the terminal 50r can recognize that the communication is connected.

  Subsequently, the session management device 20 transmits information indicating success or failure of communication connection and target call information to the call loss terminal connection unit 13 of the resource management device 10 (S317). The target call information includes the respective identifiers of the calling terminal 50s and the communication device 30s, the respective identifiers of the called terminal 50r and the communication device 30r, and information indicating the success or failure of the call.

  When the information indicating the success of the call is received, the call loss terminal connection unit 13 instructs the terminal information control unit 12 to delete the received target call information (S318). The terminal information control unit 12 deletes the entry including the target call information from the call loss list to which the entry belongs (S319). Subsequently, the terminal information control unit 12 cancels the call restriction of the terminal 50s related to the caller terminal identifier of the target call information via the communication device 30s related to the caller communication apparatus identifier of the target call information ( S320, S321).

  In addition, after step S306, it was acquired in step S302 within the allowable range of the free resource amount of the callee-side dedicated resource received in step S301 and the free resource amount of the caller-side dedicated resource received in step S305. Each call information is repeatedly executed in order.

  Next, regarding the processing procedure described in each sequence diagram, the processing procedure executed by each of the dedicated resource control unit 11, the terminal information control unit 12, and the lost call terminal connection unit 13 will be described using a flowchart.

  FIG. 11 is a flowchart for explaining an example of a processing procedure executed by the dedicated resource control unit. In FIG. 11, the step numbers in parentheses are the step numbers of the corresponding steps in FIG.

  In step S501, the dedicated resource control unit 11 acquires resource information from each communication device 30 whose identifier is stored in the disaster area list storage unit 113, and is calculated based on the resource information. The respective initial values of the upper limit value SSR and the destination-side dedicated resource upper limit value RSR are notified to each communication device 30.

  Thereafter, the dedicated resource control unit 11 repeatedly executes steps S503 to S505 at regular time intervals (S502).

  In step S503, the dedicated resource control unit 11 acquires the communication request information stored in the communication request information storage unit 111 for each communication device 30 belonging to the disaster area, and based on each communication request information, the communication request The calling-side dedicated resource upper limit value SSR and the called-side dedicated resource upper limit value RSR of the communication device 30 corresponding to the information are calculated. The calculation method is as described in step S106.

  Subsequently, the dedicated resource control unit 11 determines the presence / absence of the communication device 30 in which the calculated called-side dedicated resource upper limit value RSR is greater than 0 (S504). When there is a corresponding communication device 30 (YES in S504), the dedicated resource control unit 11 uses the calling-side dedicated resource upper limit value SSR and the called-side dedicated resource upper limit value RSR calculated for each communication device 30 to each communication device 30. (S505). Subsequently, the dedicated resource control unit 11 initializes each parameter of each communication request information to 0 (S506). Note that the case of YES in step S504 has already been described in FIG.

  On the other hand, when all of the arrival-side dedicated resource upper limit values RSR calculated for each communication device 30 are 0 (NO in S504), the dedicated resource control unit 11 performs the following for each communication device 30 belonging to the disaster area. An instruction to set each of the calling-side dedicated resource upper limit value SSR and the called-side dedicated resource upper limit value RSR to 0 is transmitted (S507). As a result, in each communication device 30, the division of the communication resources on the calling side and the called side is released.

  Subsequently, the dedicated resource control unit 11 instructs the terminal information control unit 12 to release the call loss list (S508), and ends the process of FIG. In response to the instruction, the terminal information control unit 12 cancels the call restriction of the terminal 50 related to the caller terminal identifier of each call information included in each entry of each call loss list, and all call loss lists Is deleted.

  That is, the fact that the destination-side dedicated resource upper limit value RSR of all the communication devices 30 in all the disaster-stricken areas has become zero means that the call loss has been resolved within a certain time. Therefore, processing for releasing the dedicated resource and returning to the normal communication state is executed.

  Then, the process procedure which the terminal information control part 12 performs is demonstrated. FIG. 12 is a flowchart for explaining an example of a processing procedure executed when the terminal information control unit receives call information from the session management apparatus. In FIG. 12, the step numbers in parentheses are the step numbers of the corresponding steps in FIG.

  When the terminal information control unit 12 receives the information indicating the success or failure of the call and the call information from the session management device 20, the terminal information control unit 12 determines whether or not the information indicating the success or failure of the call indicates failure (call loss). Determination is made (S601). If it is a call loss (YES in S601), the terminal information control unit 12 stores both the calling side communication device identifier and the called side communication device identifier included in the call information in the disaster area list storage unit 113. It is determined whether it has been performed (S602). If at least one of the identifiers is not stored in the disaster area list storage unit 113 (NO in S602), the process in FIG. 12 ends.

  When both identifiers are stored in the stricken area list storage unit 113 (YES in S602), the terminal information control unit 12 adds to the call loss list related to the called communication device identifier included in the call information. An entry including the call information is added (S603). Subsequently, the terminal information control unit 12 notifies the terminal 50 relating to the originating version identifier of the transmission information of the call loss, performs call restriction on the terminal 50 (S604), and performs the processing of FIG. finish.

  On the other hand, when it is not a call loss (NO in S601), the terminal information control unit 12 determines whether or not at least one of the communication devices 30 on the calling side and the called side belongs to the disaster area (S605). When at least one of the communication devices 30 on the calling side and the calling side belongs to the disaster area (YES in S605), the terminal information control unit 12 sets each of the communication device 30 on the calling side and the communication device 30 on the called side. The communication request information regarding (FIG. 7) is updated (S606).

  FIG. 13 is a flowchart for explaining an example of a processing procedure executed when the terminal information control unit receives call information regarding a successful call from the call loss terminal connection unit. In FIG. 13, the step numbers in parentheses are the step numbers of the corresponding steps in FIG.

  When the terminal information control unit 12 receives the information indicating the success of the call and the call information related to the call from the call loss terminal connection unit 13, the terminal information control unit 12 sets an entry including the call information to the call to which the call information belongs. Delete from the loss list (S701). Subsequently, the terminal information control unit 12 cancels the call restriction of the terminal 50 related to the calling terminal identifier of the call information (S702).

  Next, a processing procedure executed by the call loss terminal connection unit 13 will be described. FIG. 14 is a flowchart for explaining an example of a processing procedure executed by the call loss terminal connection unit. In FIG. 14, the step numbers in parentheses are the step numbers of the corresponding steps in FIG.

  When the call loss terminal connection unit 13 receives the free resource amount of the destination dedicated resource from any communication device 30 in the disaster area, the call loss terminal connection unit 13 acquires the call loss list of the communication device 30 from the call loss list storage unit 112. (S801). Subsequently, the call loss terminal connection unit 13 determines whether or not there is one or more entries in the call loss list (S802). If there is no entry (NO in S802), the lost call terminal connection unit 13 waits for a predetermined time (S803), and then repeats step S802.

  If there is an entry (YES in S803), the call loss terminal connection unit 13 searches for an entry with the confirmation flag = 0 from the top of the call loss list in the arrangement order (S804). If there is no entry with the confirmation flag = 0 (YES in S804), the call loss terminal connection unit 13 sets the confirmation flag values of all entries in the call loss list to 0 (S806), and after step S804 repeat.

  If there is an entry with the confirmation flag = 0 (NO in S805), the lost call terminal connection unit 13 sets 1 in the confirmation flag of the entry (S807). Subsequently, the call loss terminal connection unit 13 inquires of the communication device 30 related to the caller communication device identifier of the call information included in the entry about the availability of the caller side dedicated resource (S808).

  If there is no one or more vacant resources on the calling side dedicated resource (NO in S809), the call loss terminal connection unit 13 repeats Step S804 and subsequent steps. If there is one or more vacancy in the calling side dedicated resource (YES in S809), the call loss terminal connection unit 13 establishes communication connection between the calling side terminal 50 and the called side terminal 50 related to the calling information. (S810). When the communication connection fails (NO in S811), the call loss terminal connection unit 13 repeats Step S804 and subsequent steps. If the communication connection is successful (YES in S811), the call loss terminal connection unit 13 notifies the terminal information control unit 12 of the call information and instructs the terminal information control unit 12 to delete the entry including the call information from the call loss list. (S812).

  Subsequently, the call loss terminal connection unit 13 determines whether or not the communication-side device 30 related to the call loss list acquired in step S801 has a free dedicated resource on the called side (S813). The determination may be performed by making an inquiry to the communication device 30. If there is a vacancy in the destination dedicated resource (NO in S813), the lost call terminal connection unit 13 repeats step S804 and subsequent steps. If there is no space in the destination dedicated resource (NO in S813), the process in FIG. 14 ends.

  As described above, according to the present embodiment, when a disaster occurs, dedicated communication resources are prepared in the communication devices 30 on the originating side and the destination side in preparation for communication between the disaster areas, so It is possible to prevent the communication resource from being used up by the communication. In addition, communication between the affected areas where the call is lost is managed, and as soon as the vacant resources of the calling side dedicated resource and the called side dedicated resource are confirmed, the call lost communication is sequentially connected by the initiative of the mobile communication network side. Therefore, the free time of the dedicated resource can be reduced and the communication resource utilization efficiency can be maintained.

  As a result, in the communication between the affected areas, it is possible to secure both the originating and terminating communication resources at the same time, and to operate without prolonging the free time of the secured communication resources. As a result, it is possible to avoid call loss due to a shortage of communication resources on either the caller side or the callee side, and to reduce unnecessary recalls.

  Therefore, it is possible to quickly process communications between the disaster areas that require the communication resources on the originating side and the destination side in the disaster area, and it is possible to promote a reduction in the number of terminals 50 to be recalled and a reduction in the utilization rate of communication resources. Can be expected to be resolved early. The communication between the stricken areas may be communication within the same stricken area or may be communication between different stricken areas.

  Next, the evaluation results regarding the effect of quickly eliminating congestion according to the present embodiment will be described below. In the evaluation of this embodiment, it is assumed that there is a call request as shown in FIG.

  FIG. 15 is a diagram for explaining simulation conditions for the evaluation of the present embodiment. As shown in FIG. 15, 500 terminals 50 (hereinafter referred to as “disaster area terminals 50”) in the disaster area A1, and 500 terminals 50 (hereinafter “non-disaster areas” in the non-disaster area A2. It is assumed that there is a ground terminal 50 ") and there are call requests C1 to C3. The call request C1 is a call request from 500 non-disaster area terminals 50 to the disaster area terminals 50. The call request C2 is a call request from 250 disaster-stricken area terminals 50 to the non-stricken area terminals 50. The call request C3 is a call request from 250 disaster area terminals 50 to the disaster area terminals 50. The communication partner of each terminal 50 is assumed to be three, and is set with a uniform random number.

  Simultaneously with the start of the simulation, each terminal 50 performs a state transition as shown in FIG. FIG. 16 is a diagram illustrating state transition performed by the terminal in the simulation for evaluation according to the present embodiment.

  First, the terminal 50 selects one of the communication partners set for each as a transmission destination, and then transitions to a calling state. In the calling state, when communication resources are available and the partner terminal 50 is not busy, the communication state is entered. After communication for a certain period of time, if communication with all communication partners succeeds, the action ends. If the communication resource is insufficient or the terminal 50 belongs to the% restriction group in the calling state, after changing to the waiting state after a certain period of time has elapsed, the calling party is changed to the calling state. Return. The standby time follows a normal distribution with an average of 10 minutes, and the communication time follows a normal distribution with an average of 3 minutes (standard deviation is 1). Further, it is assumed that a maximum of 10 terminals 50 can communicate simultaneously on each of the calling side and the called side.

  When the simulation according to the above condition is executed by applying the present embodiment in a situation where the call restriction by the% restriction is operating (hereinafter referred to as “Case A”), and the present embodiment is applied. For each of the cases (hereinafter referred to as “Case B”), the time lapse of the number of active terminals is compared.

  The content of the regulation in the% regulation is that all terminals 50 in the disaster area A1 are divided into 10 groups, and calls of the terminals 50 belonging to 9 groups of them are prohibited for a certain period of time. It should be noted that the restriction group where calls are prohibited slides every 10 minutes. For example, when 10 minutes elapse from the group 1 to 9 in the state of the restriction group, the group 2 to 10 becomes the restriction group.

  FIG. 17 is a diagram illustrating changes in the number of active terminals in each of Case A and Case B. In FIG. 17, the thick solid line is the total number of terminals acting for Case A, the thick broken line is the total number of terminals acting for Case B, the thin solid line is the number of terminals acting in the affected area A1 for Case A, and the thin broken line is This is the number of terminals that are acting in case A for the disaster area A1.

  From FIG. 17, it can be confirmed that the time required for all the terminals 50 to complete the action of the case A is shorter than the case B. Also, the time required for the disaster area terminal 50 to complete the action is shorter in the case A. This is because the dedicated resource for communication between the disaster areas is prepared according to this embodiment. It is considered that this is because the call within the disaster area A1 is easy to succeed. When this embodiment is not applied, the number of calls to the disaster-stricken area terminal 50 is greater in the non-stricken area terminals 50 (500 units) than in the disaster-stricken area terminal 50 (250 units). Is difficult to succeed.

  By applying this embodiment, the time required for all terminals 50 to complete the action is shortened as soon as communication resources for outgoing and incoming resources in the disaster area A1 are available. This is considered to be because the time when resources are available can be reduced by immediately connecting the originating terminal 50 and the terminating terminal 50 (based on the loss list).

  From the above, according to the present embodiment, it has been confirmed that the effect of quickly eliminating congestion can be obtained.

  In the present embodiment, an example is shown in which the communication device 30 in the disaster area is registered in the disaster area list storage unit 113, but the communication device 30 is other than the disaster area and similar to the disaster area. The communication device 30 in the call area where congestion occurs may be registered in the disaster area list storage unit 113. For example, a call area where people (terminals 50) are concentrated due to the year-end and New Year holidays or some kind of event may be registered in the disaster area list storage unit 113. By doing so, it is possible to quickly eliminate congestion not only in communication between the affected areas but also in communication between other congested areas.

  In the present embodiment, the dedicated resource control unit 11 is an example of a dividing unit. The call loss list storage unit 112 is an example of a first storage unit. The terminal information control unit 12 is an example of a regulation unit. The call loss terminal connection unit 13 is an example of a connection unit. The calling-side general resource, the calling-side dedicated resource, the called-side general-purpose resource, and the called-side dedicated resource are examples of the first communication resource, the second communication resource, the third communication resource, and the fourth communication resource, respectively. The disaster area list storage unit 113 is an example of a second storage unit.

  As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to such specific embodiment, In the range of the summary of this invention described in the claim, various deformation | transformation・ Change is possible.

DESCRIPTION OF SYMBOLS 1 Communication system 10 Resource management apparatus 11 Dedicated resource control part 12 Terminal information control part 13 Lost call terminal connection part 20 Session management apparatus 30 Communication apparatus 31 Resource information transmission part 32 Resource setting part 33 Resource allocation control part 40 Base station 50 Terminal 100 Drive device 101 Recording medium 102 Auxiliary storage device 103 Memory device 104 CPU
105 Interface Device 111 Communication Request Information Storage Unit 112 Call Loss List Storage Unit 113 Disaster Area List Storage Unit 301 Resource Information Storage Unit As Originating Area Ar Arrival Side Area B Bus

Claims (6)

The communication resource for call origination for each call area of the mobile communication network is divided into a first communication resource and a second communication resource, and the communication resource for call arrival for each call area is divided into a third communication resource and a fourth communication resource. A dividing unit that divides the communication resource into
In response to a call from the first terminal, the first communication resource in the first call area on the caller side of the call and the third communication resource in the second call area on the callee side of the call A first storage unit that stores the identifier of the first terminal and the identifier of the second terminal on the called side related to the call when at least one of
A regulation unit that regulates outgoing calls from the first terminal in which the identifier is stored in the first storage unit;
Based on the identifier stored in the first storage unit, the first terminal and the second terminal according to the occurrence of a vacancy of the fourth communication resource in the second call area A connection for connecting communication using the second communication resource of the first call area and the fourth communication resource;
A communication system comprising: The dividing unit determines an upper limit value of the second communication resource in the first call area based on a success status of a call within a predetermined time in the first call area, and determines the second call Determining an upper limit value of the fourth communication resource of the second call area based on the success status of the incoming call within the predetermined time in the area;
The communication system according to claim 1. A second storage unit that stores identifiers related to a part of the call area of the mobile communication network;
The dividing unit divides a communication resource for outgoing call and a communication resource for incoming call in which the identifier is stored in the second storage unit.
The communication system according to claim 1 or 2. The part of the call area is identified according to the occurrence of a disaster,
The communication system according to claim 3. The communication resource for call origination for each call area of the mobile communication network is divided into a first communication resource and a second communication resource, and the communication resource for call arrival for each call area is divided into a third communication resource and a fourth communication resource. A dividing unit that divides the communication resource into
In response to a call from the first terminal, the first communication resource in the first call area on the caller side of the call and the third communication resource in the second call area on the callee side of the call A first storage unit that stores the identifier of the first terminal and the identifier of the second terminal on the called side related to the call when at least one of
A regulation unit that regulates outgoing calls from the first terminal in which the identifier is stored in the first storage unit;
Based on the identifier stored in the first storage unit, the first terminal and the second terminal according to the occurrence of a vacancy of the fourth communication resource in the second call area A connection for connecting communication using the second communication resource of the first call area and the fourth communication resource;
A resource management device comprising: Computer
The communication resource for call origination for each call area of the mobile communication network is divided into a first communication resource and a second communication resource, and the communication resource for call arrival for each call area is divided into a third communication resource and a fourth communication resource. A division procedure for dividing the communication resource into
In response to a call from the first terminal, the first communication resource in the first call area on the caller side of the call and the third communication resource in the second call area on the callee side of the call A storage procedure for storing, in the first storage unit, the identifier of the first terminal and the identifier of the second terminal on the called side related to the call when at least one of
A regulation procedure for regulating outgoing calls from the first terminal in which the identifier is stored in the first storage unit;
Based on the identifier stored in the first storage unit, the first terminal and the second terminal according to the occurrence of a vacancy of the fourth communication resource in the second call area A connection procedure for connecting communication using the second communication resource of the first call area and the fourth communication resource;
The communication method characterized by performing.

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