JP7138559B2 - Transfer control device - Google Patents

Description

One aspect of the present invention relates to a transfer control device that controls transfer of subscriber information.

Conventionally, in mobile communication services provided by telecommunications carriers, subscriber profiles (subscriber information) about subscribers (contractors) who are users of mobile terminals are stored in a plurality of subscriber information management devices (e.g., HLRs). /HSS (Home Subscriber Server/Home Location Register)) (see, for example, Patent Documents 1 and 2 below). Normally, the correspondence relationship between subscriber information management devices and subscriber profiles (that is, which subscriber profile is stored in which subscriber information management device) is fixedly determined based on the mobile terminal number band. .

JP 2017-11793 A JP-A-11-18135

By the way, for example, due to the holding of an event such as a fireworks display where many people gather, there are cases where the amount of communication (traffic) for the subscriber profiles of users in a specific area where the event is held suddenly increases. When the correspondence relationship between the subscriber information management device and the subscriber profile is fixedly determined as described above, the subscriber may A bias in the amount of communication may occur between the information management apparatuses.

Accordingly, it is an object of one aspect of the present invention to provide a handover control device capable of autonomously suppressing imbalance in traffic to a subscriber information management device.

A handover control device according to one aspect of the present invention includes a plurality of subscriber information distributed and accommodated in a plurality of subscriber information management devices, each of which includes information indicating the area in which a user subscribing to a mobile communication service resides. Among them, a target period acquisition unit that acquires a target period in the future in which the communication volume of subscriber information related to users residing in a specific area is expected to exceed a predetermined reference volume; A user extracting unit that extracts users who are expected to be in a specific area during a target period based on the correspondence relationship between the subscriber information and the subscriber information management device during the period; a device extraction unit for extracting a subscriber information management device containing first subscriber information, which is subscriber information; a transfer target determination unit for determining second subscriber information, which is first subscriber information to be transferred, based on the number of subscribers; a transfer unit for transferring the second subscriber information to the information management device.

According to the transfer control device according to one aspect of the present invention, by executing the accommodation change of the first subscriber information regarding the user who is highly likely to contribute to the increase in the communication traffic during the target period, the first subscriber information It is possible to equalize the number of accommodated subscriber information management devices. That is, it is possible to avoid a situation in which a large amount of first subscriber information is unevenly distributed in a specific subscriber information management device. As a result, it is possible to autonomously suppress the imbalance in the amount of traffic to the subscriber information management device due to the access to the first subscriber information during the target period.

A handover control device according to another aspect of the present invention comprises a plurality of subscriber information management devices for distributing and accommodating a plurality of subscriber information each including information indicating the coverage area of a user subscribing to a mobile communication service. An acquisition unit that periodically acquires information indicating communication traffic to the subscriber information management device from each, and a target device that detects a target device that is a subscriber information management device whose communication traffic exceeds a predetermined reference amount. a detecting unit, a visiting area extracting unit for extracting a visiting area corresponding to subscriber information that causes an increase in communication traffic based on communication traffic for each subscriber information stored in the target device, and a visiting area extracting unit. a device extraction unit for extracting a subscriber information management device containing first subscriber information, which is subscriber information about a user residing in the area extracted by the area extraction unit; a transfer target determination unit that determines second subscriber information, which is the first subscriber information to be transferred, based on the number of first subscriber information stored in the information management device; and a transfer unit for transferring the second subscriber information from the subscriber information management device accommodating the subscriber information management device to another subscriber information management device.

According to the handover control device according to another aspect of the present invention, the subscriber information management device whose communication volume exceeds the reference volume based on the information indicating the communication volume periodically acquired from each subscriber information management device (target device) can be detected. Furthermore, based on the amount of communication for each subscriber information stored in the target device, a location area (specific location area) corresponding to the subscriber information that is the cause of the increase in communication volume is extracted, and the specific location area is extracted. leveling the number of stored first subscriber information relating to users residing in a specific service area among subscriber information management devices by executing re-accommodation of first subscriber information relating to users residing in a specific service area becomes possible. That is, it is possible to solve the situation where a large amount of first subscriber information is unevenly distributed in the target device. As a result, it is possible to suppress the amount of communication to the target device due to access to the first subscriber information.

According to one aspect of the present invention, it is possible to provide a handover control device capable of autonomously suppressing imbalance in traffic to a subscriber information management device.

1 is a diagram showing a configuration of a communication system including a transfer control device according to an embodiment; FIG. 2 is a diagram showing a functional configuration of a transfer control device according to the first embodiment; FIG. It is a figure which shows an example of traffic information. It is a figure which shows an example of event information. It is a figure which shows an example of a specific area and a target period. FIG. 10 is a diagram showing an example of the management status of subscriber profiles in the past period; FIG. 10 is a diagram showing an example of a correspondence relationship between a first subscriber profile and HLR/HSS for predicted users in a range; 4 is a flow chart showing an example of the operation of the transfer control device according to the first embodiment; FIG. 10 is a diagram showing the functional configuration of a transfer control device according to the second embodiment; FIG. 4 is a diagram showing an example of traffic (number of signals) for each subscriber profile accommodated in a target device; FIG. 4 is a diagram showing an example of a correspondence relationship between a first subscriber profile and HLR/HSS for users residing in a specific service area; 9 is a flow chart showing an example of the operation of the transfer control device according to the second embodiment; 3 is a diagram illustrating an example of a hardware configuration of a transfer control device; FIG.

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. In the description of the drawings, the same or corresponding elements are denoted by the same reference numerals, and overlapping descriptions are omitted.

[First embodiment]
FIG. 1 is a diagram showing the configuration of a communication system 1 including a transfer control device 10A according to the first embodiment. The communication system 1 includes a handover control device 10A, a plurality of HLR/HSS (subscriber information management devices) 20, and an operation device 30. FIG. The HLR/HSS 20 is a database device that accommodates (manages and stores) subscriber profiles (subscriber information) regarding users who are subscribers of mobile communication services provided by communication carriers. The subscriber profile includes the subscriber's telephone number, contract details, IMSI (SIM identification number), location information of the mobile terminal held by the user (information indicating the service area), and the like. Subscriber profiles of a plurality of users using mobile communication services are distributed and accommodated in a plurality of HLR/HSS 20 installed in various locations. Access to the subscriber profile stored in the HLR/HSS 20 can occur, for example, when a mobile terminal requests location registration, when the mobile terminal originates and receives a call, and the like.

Here, for example, when a large-scale event (for example, a fireworks display) is held, it is assumed that the participants of the event use relatively many mobile terminals (mobile phones, etc.) at the same place. Due to this, during the period of the event, access to the subscriber profile (that is, the HLR/HSS 20 containing the subscriber profile) related to the users located in the area where the event is held is more difficult than usual. can increase significantly. As a result, traffic (communication volume) deviation may occur between the HLR/HSS 20 . As a result, a situation arises in which it is difficult to connect to the HLR/HSS 20 where traffic is concentrated, and there is a risk that the use of mobile terminals whose subscriber profiles are accommodated in the HLR/HSS 20 will be restricted. The transfer control device 10A autonomously controls subscriber profile reaccommodation (i.e., subscriber profile transfer between HLR/HSS 20) in order to suppress such traffic imbalance between HLR/HSS 20. .

The transfer control device 10A can communicate with each of the plurality of HLR/HSS 20 via any communication network such as the Internet. The handover control device 10A obtains event information about events, traffic information about traffic generated in each HLR/HSS 20, etc., and based on the results of analysis using these information, creates a subscriber profile between the HLR/HSS 20. Control transfers.

The operation device 30 can communicate with the transfer control device 10A via any communication network such as the Internet. The operation device 30 is a management terminal for the operator to input (register) event information to the transfer control device 10A and to check the analysis result by the transfer control device 10A.

Next, each functional element of the transfer control device 10A will be described. As shown in FIG. 2, the transfer control device 10A includes a traffic information acquisition unit 11, a traffic information storage unit 12, an event information acquisition unit 13, an event information storage unit 14, a target period acquisition unit 15, a user It includes an extraction unit 16 , a device extraction unit 17 , a transfer target determination unit 18 , and a transfer unit 19 .

The traffic information acquisition unit 11 acquires traffic information regarding traffic volume for each subscriber profile (that is, for each user). Traffic information is information that indicates the history of accesses to the HLR/HSS 20 for data access to subscriber profiles. For example, traffic information is acquired and accumulated at each HLR/HSS 20 each time a subscriber profile is accessed. The traffic information acquisition unit 11 periodically collects traffic information accumulated in each HLR/HSS 20 from each HLR/HSS 20 and stores the traffic information in the traffic information storage unit 12 . The traffic information storage unit 12 is a database device that stores traffic information. The traffic information storage unit 12 accumulates traffic information for each subscriber profile for an arbitrary period in the past.

FIG. 3 is a diagram showing an example of traffic information. As an example in this embodiment, the traffic information includes information about the subscriber phone number, the HLR/HSS served, the coverage area, the duration of coverage, and the number of signals transmitted and received at the HLR/HSS. A subscriber phone number is a number associated with a user who is a service subscriber, and is information for identifying the user (ie, subscriber profile). The accommodating HLR/HSS is information for identifying the HLR/HSS 20 in which the subscriber profile is accommodated. The serving area is the area corresponding to the location information of the user (mobile terminal) associated with the subscriber profile. The period of stay indicates the period during which the user (mobile terminal) associated with the subscriber profile was present in the visited area. The number of signals sent and received at the HLR/HSS is an example of the traffic for the subscriber profile that occurred during the visit period. Here, as an example, the traffic information includes the total number of signals (total traffic) generated during the entire period of coverage and the number of signals per unit period (here, one hour as an example).

The traffic information shown in FIG. 3 is periodically (e.g. hourly) from the HLR/HSS 20 identified by "A Sumida" for the subscriber profile for the user whose subscriber telephone number is "090-xxxx-1111". It is information that integrates the traffic information acquired by This traffic information is for the subscriber profile of the user whose subscriber telephone number is "090-xxxx-1111" accommodated in the HLR/HSS 20 identified by "Sumida A", 01/01/2018. It shows the amount of traffic (the number of signals) generated from 12:00 to 24:00 (while the user is in "Tokyo A").

The event information acquisition unit 13 acquires event information including information on the holding period and holding area of future events. Here, an event is an event in general that is expected to attract many people during a specific period and place. Events are, for example, fireworks displays, concerts, festivals, and the like. The event information acquisition unit 13 acquires event information registered by an operator via the operation device 30, for example. The event information acquired by the event information acquisition unit 13 is stored in the event information storage unit 14 . The event information storage unit 14 is a database device that stores event information.

FIG. 4 is a diagram showing an example of event information. As an example in this embodiment, the event information includes information on the event name, period, event area, and the number of customers (planned number of customers, previous number of customers). Here, the event name is information for identifying the event. The number of customers attracted last time indicates the number of customers attracted at the time of the previous event of a regularly held event (here, as an example, “○○ fireworks display” held at the same time every year).

In the event information shown in FIG. 4, the event identified by the event name "30th ○○ fireworks display" was identified by "Yokohama A" from 19:00 to 21:00 on November 15, 2018. This indicates that the event will be held in an area In addition, the event information indicates that this event (XX fireworks display) is an event that is held regularly, that the planned number of visitors is 100,000, and that the number of visitors at the time of the previous event (i.e., the 29th XX fireworks display) 80,000 people at the time of the event).

The target period acquisition unit 15 acquires a future target period in which the communication volume for subscriber profiles related to users residing in a specific area is expected to exceed a predetermined reference volume. That is, the target period acquisition unit 15 acquires information that associates the specific area and the target period with each other. Here, the reference amount can be determined in advance by an operator or the like, for example. The reference amount can be determined, for example, based on the actual amount of traffic during normal times when special events are not held (for example, the average amount of traffic generated in an arbitrarily set unit period, etc.). Note that the reference amount may be determined for each area, since the number of users and traffic during normal times differ for each area.

The target period acquisition unit 15 may acquire the specific area and the target period registered by the operator via the operation device 30, for example. Also, the target period acquisition unit 15 may acquire the specific area and the target period based on at least one of the traffic information stored in the traffic information storage unit 12 and the event information stored in the event information storage unit 14. . Some processing examples for the latter case are described below.

(first example)
Based on the traffic information stored in the traffic information storage unit 12, the target period acquisition unit 15 acquires a high traffic period during which the communication volume exceeds the reference volume for the subscriber profile of the user residing in the specific area. good too. Then, the target period acquisition unit 15 may acquire a future period having the same or similar attribute as the high traffic period as the target period. That is, the first example is a method of identifying a past period (high traffic period) in which the amount of traffic actually exceeded the reference amount, and acquiring a future period having characteristics similar to the past period as the target period. is.

For example, based on the traffic information stored in the traffic information storage unit 12, the target period acquisition unit 15 determines the amount of communication (in this embodiment, the number of signals transmitted and received in HLR/HSS (see FIG. 3 )) are aggregated for each predetermined unit period (for example, one hour). Then, the target period acquisition unit 15 compares the communication volume aggregated for each location area and for each unit period with the reference volume, and obtains a combination of a location area and a period in which the communication volume exceeds the reference volume (that is, , specific areas and high traffic periods).

Subsequently, the target period acquisition unit 15 acquires attributes of the high traffic period identified in this way (for example, characteristics associated with the period such as day of the week, time period, weather, etc.). Regarding the weather, the target period acquisition unit 15 accesses a server (for example, a server managed by the Japan Meteorological Agency) that provides information on the weather (temperature, weather, etc.), for example. Get weather information.

Here, when a plurality of high-traffic periods are acquired for one specific area, the target period acquiring unit 15 acquires attributes common to the plurality of high-traffic periods (or attribute) may be set as the attribute of the high traffic period. In this case, based on a plurality of samples, it is possible to accurately acquire the attribute that is considered to be the cause of the traffic volume exceeding the reference volume in the specific area.

Subsequently, the target period acquisition unit 15 acquires future periods having attributes that are the same as or similar to the attributes of the high traffic period acquired as described above. For example, the target period acquisition unit 15 may acquire, as the target period, the same day of the week and the same time period as the high traffic period, and the same or similar weather as the high traffic period is predicted. . It should be noted that similar criteria can be arbitrarily determined in advance. For example, "sunny" and "cloudy" may be defined as similar to each other because they have in common that it is not raining.

(Second example)
The target period acquisition unit 15 may acquire the specific area and the target period based on the event information stored in the event information storage unit 14 . Specifically, the target period acquisition unit 15 may acquire the area corresponding to the event area included in the event information as the specific area and the event period included in the event information as the target period. For example, based on the event information shown in FIG. 4, the target period acquisition unit 15 sets the area corresponding to the holding area "Yokohama A" of the event information as a specific area, and the holding period "2018/11/2018" 15 19:00 to 21:00" as the target period. Note that the target period acquisition unit 15 may acquire the specific area and the target period using only event information related to events in which the expected number of customers is equal to or greater than a predetermined threshold. In this case, it is possible to accurately acquire the target period in which the communication traffic for the subscriber profile of the user residing in the specific area is highly likely to exceed the reference traffic.

(Third example)
The target period acquisition unit 15 may determine whether or not to acquire the event period as the target period based on the actual traffic volume for the subscriber profile in the past period of the regularly held event. . That is, the target period acquisition unit 15 obtains an event that has a track record of increased communication traffic for a subscriber profile when held in the past (that is, the communication traffic for a subscriber profile related to a user who resides in the event area during the event period is the reference amount). A specific area and target period may be acquired based on event information related to an event that is particularly likely to exceed .

Specifically, the target period acquisition unit 15 selects the event associated with the event information stored in the event information storage unit 14 (here, as an example, “30th ○○ fireworks display” shown in FIG. 4) The traffic information during the holding period of the corresponding past event “29th ○○ fireworks display” is acquired from the traffic information storage unit 12 . Here, the information indicating the holding period of the past event is stored in association with the event information, for example.

Based on the traffic information thus acquired, the target period acquiring unit 15 acquires subscriber profiles of users who were in the area where the event was held (here, "Yokohama A") during the period when the event was held in the past. has exceeded the reference amount. Then, when it is determined that the communication volume exceeds the reference volume, the target period acquisition unit 15 sets the area corresponding to the event area “Yokohama A” included in the event information as a specific area, and determines the event period included in the event information as a specific area. Acquire "2018/11/15 19:00 to 21:00" as the target period. On the other hand, when it is not determined that the communication volume exceeds the reference volume, the target period acquiring unit 15 does not need to acquire the specific area and the target period based on the event information. According to such processing, the target period acquiring unit 15 can expect an increase in the traffic in the specific area based on the event information related to the event in which the traffic for the subscriber profile has exceeded the reference amount in the past. The target period can be obtained with high accuracy.

FIG. 5 is a diagram showing an example of the specific area and the target period acquired by the processing of the target period acquiring unit 15 as described above. As shown in FIG. 5, multiple sets of specific areas and time periods of interest may be obtained. In this case, the processes of the user extraction unit 16, the device extraction unit 17, the transfer target determination unit 18, and the transfer unit 19, which will be described later, may be executed for each set of the specific area and target period.

The user extraction unit 16, based on the correspondence relationship between the subscriber profile and the HLR/HSS 20 in the period prior to the target period (that is, information indicating which subscriber profile is accommodated in which HLR/HSS 20), Extract users who are predicted to be in a specific area during the target period. In other words, the user extraction unit 16 extracts users who are present in the specific area during the target period and who are highly likely to contribute to an increase in traffic to the HLR/HSS 20 .

Generally, information indicating the management status of each subscriber profile (that is, the correspondence relationship between the subscriber profile and the HLR/HSS 20) is shared among multiple HLR/HSS 20. FIG. By periodically acquiring such information from any HLR/HSS 20, the user extraction unit 16 acquires information indicating the correspondence relationship between the subscriber profile and the HLR/HSS 20 in any past period. good. Alternatively, the user extraction unit 16 may refer to the traffic information stored in the traffic information storage unit 12 to generate information indicating the management status of each subscriber profile in the past period. Through the above-described processing, the user extraction unit 16 can acquire a list of accommodated HLRs/HSSs and existing areas in the past period for each subscriber profile.

FIG. 6 is a diagram showing an example of a list obtained in this way. Then, the user extraction unit 16 may extract users who have been in the specific area during the past period as users who are predicted to be in the specific area during the target period (hereinafter "predicted users in the area"). . For example, if the specific area is "Tokyo A", the user related to the first record shown in FIG. .

Here, when the specific area and the target period are the holding area and holding period of the event associated with the event information stored in the event information storage unit 14 (that is, when the target period acquiring unit 15 is the above-described second or third ), the user extracting unit 16 extracts the predicted user in the area, for example, with the same time zone on the day before the target period as the past period. good.

Alternatively, the user extraction unit 16 may extract the past event "29th XX fireworks display" corresponding to the event associated with the event information (here, as an example, "30th XX fireworks display" shown in FIG. 4). may be extracted as predicted users who are predicted to reside in the specific area (that is, "Yokohama A") during the target period. According to this configuration, for events with many repeaters, predicted users who are likely to participate in the event are selected based on past event participation records (specifically, those who were in the event area during the past event period). It is possible to extract with high accuracy based on actual results).

Note that the user extraction unit 16 may extract a predicted user who is in the area by combining a plurality of techniques as described above. That is, the user extraction unit 16 may extract predicted users in the area based on a plurality of past periods.

The device extraction unit 17 extracts the HLR/HSS 20 containing the first subscriber profile (first subscriber information), which is the subscriber profile related to the predicted user extracted by the user extraction unit 16 . The device extracting unit 17 determines the correspondence relationship between the subscriber profile and the HLR/HSS 20 (i.e., which HLR/HSS 20 and which subscriber information indicating whether the profile is accommodated), the HLR/HSS 20 accommodating the first subscriber profile is extracted. Information indicating such correspondence may be obtained from any HLR/HSS 20 or may be generated based on traffic information stored in the traffic information storage unit 12 .

FIG. 7 is a diagram showing an example of the correspondence relationship between the HLR/HSS 20 extracted in this way and the first subscriber profile. In the example of FIG. 7, the subscriber profile (the subscriber profile corresponding to the subscriber telephone number "090-xxxx-1234"), which is one of the first subscriber profiles, is the HLR identified by "Yoyogi A". /HSS20. The same applies to other records.

Based on the number of first subscriber profiles accommodated in the HLR/HSS 20 extracted by the device extraction unit 17, the transfer target determination unit 18 selects a second subscriber profile ( second subscriber information). Specifically, the transfer target determination unit 18 determines the first subscriber for each HLR/HSS 20 based on the information (information shown in FIG. 7) indicating the HLR/HSS 20 where each first subscriber profile is stored. Calculate the number of profiles that can be accommodated. Table 1 shows an example of the number and ratio of the first subscriber profiles accommodated for each HLR/HSS 20 obtained by such calculation processing.

For example, based on a predetermined accommodation standard (accommodation upper limit), the transfer target determination unit 18 selects the number of first subscriber profiles accommodated in the HLR/HSS 20 having the accommodation number (or ratio) exceeding the accommodation standard. A part may be determined as a second subscriber profile to be transferred to another HLR/HSS 20 .

The accommodation standard may be set based on the number of accommodation (proportion) to the total number of first subscriber profiles. For example, the upper limit of the ratio per HLR/HSS 20 (for example, 20% of the whole) may be set as the accommodation standard. In this case, the transfer target determining unit 18 determines that the first subscriber profile stored in the HLR/HSS 20 ("Yoyogi A" in the example of Table 1) having a ratio greater than the upper limit exceeds the upper limit. (ie 48% of the total) first subscriber profile may be determined as the second subscriber profile.

Alternatively, the accommodation criteria may be set based on the number of accommodation of the first subscriber profile. For example, the upper limit of the number of first subscriber profiles that can be accommodated per HLR/HSS 20 (for example, 150000) may be set as the accommodation criterion. In this case, the transfer target determination unit 18 determines that 450,000 first subscriber profiles accommodated in the HLR/HSS 20 (“Yoyogi A” in the example of Table 1) that accommodate more first subscriber profiles than the maximum number of accommodated subscriber profiles. Among them, the first subscriber profiles that exceed the upper limit of accommodated number (that is, 300,000) may be determined as the second subscriber profiles.

The transfer unit 19 transfers the second subscriber profile from the HLR/HSS 20 containing the second subscriber profile determined by the transfer target determination unit 18 to another HLR/HSS 20 . For example, the transfer unit 19 selects the HLR/HSS 20 to which the second subscriber profile is to be transferred. In the example of Table 1, when the upper limit number of accommodated first subscriber profiles (for example, 150,000) per HLR/HSS 20 is set as the accommodation standard, the transfer unit 19 selects "Gifu D", which has an excess accommodation capacity. , “Osaka B” and “Sumida A” may be selected as transfer destinations. Also, the transfer unit 19 may select any HLR/HSS 20 that does not currently accommodate the first subscriber profile (that is, the HLR/HSS 20 not included in Table 1) as the transfer destination. Also, the transfer unit 19 may set the number of second subscriber profiles to be transferred to each HLR/HSS 20 within a range not exceeding the accommodation standard of the HLR/HSS 20 to which the transfer is to be made.

For example, the transfer unit 19 selects the HLR/HSS 20 of "Gifu D" as the transfer destination of the second subscriber profile of 50000 for the second subscriber profile of 300000 accommodated in the HLR/HSS 20 of "Yoyogi A". , the HLR/HSS 20 of "Osaka B" is selected as the transfer destination of the second subscriber profile of 65000, the HLR/HSS 20 of "Sumida A" is selected as the transfer destination of the second subscriber profile of 120000, and the remaining 65000 Any HLR/HSS 20 that does not currently accommodate the first subscriber profile may be selected as the transfer destination of the second subscriber profile.

Subsequently, the transfer unit 19 connects the HLR/HSS 20 ("Yoyogi A" in the above example), which is the transfer source of the second subscriber profile, and one or more HLR/HSS 20, which are the transfer destinations selected as described above. In response, information instructing the transfer of the second subscriber profile (data movement) is notified. For example, the transfer unit 19 instructs the HLR/HSS 20 that is the transfer source to transfer the second subscriber profile to each HLR/HSS 20 that is the transfer destination. Further, the transfer unit 19 instructs each HLR/HSS 20 to be the transfer destination to accept the transfer of the second subscriber profile. Triggered by such notification processing by the transfer unit 19, transfer of the second subscriber profile is realized between the HLR/HSS 20 that is the transfer source and the HLR/HSS 20 that is the transfer destination. With such a configuration, it is possible to autonomously change the accommodation of subscriber profiles without the need for operator intervention.

In addition, the transfer part 19 does not necessarily instruct each HLR/HSS 20 to directly transfer, and may indirectly instruct each HLR/HSS 20 to transfer. For example, when there is a relay device that instructs the HLR/HSS 20 to perform a specific operation (data transfer, etc.), the transfer unit 19 transfers information indicating the details of the transfer of the second subscriber profile to the relay device. The device may be notified.

Next, an example of the operation of the transfer control device 10A (method of transferring subscriber information) will be described. FIG. 8 is a flowchart showing an example of the operation of the transfer control device 10A.

In step S1, the traffic information acquiring unit 11 acquires traffic information (see FIG. 3) regarding the amount of communication for each subscriber profile. For example, the traffic information acquisition unit 11 periodically collects traffic information from each HLR/HSS 20 . The acquired traffic information is stored in the traffic information storage unit 12 .

In step S2, the event information acquisition unit 13 acquires event information (see FIG. 4). The acquired event information is stored in the event information storage unit 14 .

In step S3, the target period acquisition unit 15 executes, for example, at least one of the first to third examples described above, thereby predetermining the communication volume for the subscriber profile of the user residing in the specific area. Obtain the future period of interest (see Figure 5) that is expected to exceed the specified reference amount. That is, the target period acquisition unit 15 acquires a set of the specific area and the target period.

In step S<b>4 , the user extraction unit 16 extracts users who are predicted to be in the specific area during the target period (predicted users in the area) by executing the process described above.

In step S5, the device extracting unit 17 extracts the HLR/HSS 20 containing the first subscriber profile, which is the subscriber profile relating to the predicted user in the area (see FIG. 7).

In step S6, based on the number of first subscriber profiles stored in the HLR/HSS 20 extracted by the device extracting unit 17, the transfer target determining unit 18 selects the second subscriber profile, which is the first subscriber profile to be transferred. Determine subscriber profile. For example, the transfer target determination unit 18 determines the first subscriber profile exceeding the accommodation standard as the second subscriber profile based on the accommodation standard as described above.

In step S<b>7 , the transfer unit 19 transfers the second subscriber profile from the HLR/HSS 20 accommodating the second subscriber profile to another HLR/HSS 20 . As an example, the transfer unit 19 selects the HLR/HSS 20 to which the second subscriber profile is to be transferred and determines the number of second subscriber profiles to be transferred to each HLR/HSS 20 by the above-described processing. Then, the transfer unit 19 notifies the HLR/HSS 20 serving as the transfer source and the HLR/HSS 20 serving as the transfer destination of information instructing the transfer of the second subscriber profile. Triggered by such notification, the transfer of the second subscriber profile is realized between the HLR/HSS 20 that is the transfer source and the HLR/HSS 20 that is the transfer destination. It should be noted that the processing of steps S1 to S7 are all executed at an arbitrary time point before the target period.

According to the handover control device 10A described above, the first subscriber profile related to the user who is likely to contribute to the increase in traffic during the target period (that is, the predicted user who is in the area and is extracted by the user extraction unit 16) is accommodated. replacement can be performed. In the example of Table 1, in a situation where many first subscriber profiles are disproportionately stored in "Yoyogi A", the transfer target determining unit 18 determines the first subscriber profile (second subscriber profile) to be transferred. ) is appropriately determined, and the transfer unit 19 instructs the HLR/HSS 20, which is the transfer source or the transfer destination, to transfer the second subscriber profile. With such a configuration, it is possible to equalize the number of accommodated first subscriber profiles among the HLR/HSS 20 . That is, it is possible to avoid a situation in which many first subscriber profiles are unevenly distributed in a specific HLR/HSS 20 . As a result, it is possible to autonomously suppress the imbalance in traffic to the HLR/HSS 20 due to access to the first subscriber profile during the target period.

Further, as in the above-described first example, the target period acquisition unit 15 detects a high traffic period in which the communication volume for the subscriber profile of the user residing in the specific area exceeds the reference volume, based on the traffic information. A future period having the same or similar attributes as the high traffic period may be acquired as the target period. According to the above configuration, based on whether or not there is a characteristic similar to the specific area in which the communication volume actually exceeded the reference volume in the past and the high traffic period, the specific area where the communication volume is highly likely to exceed the reference volume and a set of target periods can be obtained with high accuracy.

Further, as in the second example described above, the target period acquisition unit 15 may acquire an area corresponding to the event area included in the event information as the specific area and the event period included in the event information as the target period. good. According to the above configuration, based on the event information, it is possible to easily and accurately acquire a set of the specific area and the target period in which the communication traffic is highly likely to exceed the reference traffic.

Further, as in the above-described third example, the target period acquisition unit 15 obtains traffic information during the past event holding period corresponding to the event associated with the event information based on the traffic information during the past event holding period. A determination may be made as to whether or not the traffic for the subscriber profile of the user who was in the area exceeded the reference traffic. Then, when it is determined that the communication volume exceeds the reference volume, the target period acquisition unit 15 sets the area corresponding to the holding area included in the event information as the specific area, and sets the holding period included in the event information as the target period. may be obtained. According to the above configuration, an increase in traffic in a specific area can be expected based on event information related to an event in which the traffic for a subscriber profile corresponding to a specific area (hosting area) has exceeded the reference amount in the past. The target period can be obtained with high accuracy.

In addition, the user extraction unit 16 extracts users who were in the holding area during the holding period of the past event corresponding to the event associated with the event information (that is, users who may have participated in the past event). , may be extracted as predicted users who are predicted to reside in a specific area during the target period. According to the above configuration, for an event with many repeaters, it is possible to accurately extract predicted users who are likely to participate in the event based on past event participation records.

[Second embodiment]
FIG. 9 is a diagram showing the functional configuration of the transfer control device 10B according to the second embodiment. The transfer control device 10A according to the first embodiment acquires a period (target period) in which a rapid increase in traffic is expected in the future, and executes subscriber profile transfer between the HLR/HSS 20 before the target period. was configured to On the other hand, the transfer control device 10B according to the second embodiment transfers the subscriber profile ex post facto when it is detected that the communication traffic exceeding the reference traffic occurs in a specific HLR/HSS 20. is configured to run

As shown in FIG. 9, the transfer control device 10B does not include the event information acquisition unit 13, the event information storage unit 14, the target period acquisition unit 15, the user extraction unit 16, and the device extraction unit 17. It differs from the transfer control device 10A in that it includes a detection unit 51 , a presence area extraction unit 52 , and a device extraction unit 53 .

In the handover control device 10B, the traffic information acquisition unit 11 (acquisition unit) obtains the amount of communication from each of the plurality of HLR/HSS 20 to each HLR/HSS 20 (in this embodiment, the amount of communication subdivided for each subscriber profile ) is obtained periodically. Here, the traffic information acquisition unit 11 collects traffic information from each HLR/HSS 20 in real time and stores the traffic information in the traffic information storage unit 12 .

The target device detection unit 51 detects the HLR/HSS 20 (target device) whose traffic exceeds a predetermined reference amount. For example, the target device detection unit 51 detects the amount of communication for each HLR/HSS 20 based on the traffic information (traffic information stored in the traffic information storage unit 12) collected from each HLR/HSS 20 in real time as described above. Monitor from time to time. For example, the target device detection unit 51 detects the amount of communication (in this embodiment, the number of signals transmitted and received in HLR/HSS (see FIG. 3)) in the most recent period (for example, a predetermined unit period such as 30 minutes). Monitor in real time. Then, the target device detection unit 51 detects the HLR/HSS 20 in which the communication amount in the most recent period exceeds the reference amount by comparing the communication amount in the most recent period with the reference amount at any time for each HLR/HSS 20. .

Based on the amount of communication for each subscriber profile accommodated in the HLR/HSS 20 (target device) detected by the target device detection unit 51, the existing area extraction unit 52 extracts the subscriber profile that is the cause of the increase in the traffic. to extract the area corresponding to (hereinafter referred to as "specific area"). For example, based on the traffic information collected from each HLR/HSS 20 in real time as described above, the existing area extraction unit 52 grasps the traffic volume for each subscriber profile accommodated in the target device.

FIG. 10 is a diagram showing an example of traffic (the number of signals in the most recent period) for each subscriber profile accommodated in a target device (here, HLR/HSS 20 identified by "Yoyogi A" as an example). . In this example, the user (mobile terminal) corresponding to the subscriber profile corresponding to the subscriber telephone number "090-xxxx-5678" is located in "Tokyo A" and On the other hand, it is indicated that a communication volume (number of signals) of "100" has occurred.

Then, the visited area extraction unit 52 aggregates the information shown in FIG. 10 (information indicating the visited area and communication volume for each subscriber profile stored in the target device) for each visited area. As a result, it is possible to extract the location area (here, “Tokyo A” as an example) with the largest total amount of traffic as the specific location area.

The device extraction unit 53 extracts the HLR/HSS 20 containing the subscriber profile (first subscriber profile) regarding the user residing in the specific visiting area (Tokyo A) extracted by the visiting area extracting unit 52. do. The processing by the device extractor 53 is the same as the processing by the device extractor 17 .

FIG. 11 is a diagram showing an example of the correspondence relationship between the HLR/HSS 20 extracted in this way and the first subscriber profile. In the example of FIG. 11, the subscriber profile (the subscriber profile corresponding to the subscriber telephone number "090-xxxx-1234"), which is one of the first subscriber profiles, is the HLR identified by "Yoyogi A". /HSS20. The same applies to other records.

The functions of the transfer target determination unit 18 and the transfer unit 19 are as described in the first embodiment. That is, based on the number of first subscriber profiles accommodated in the HLR/HSS 20 extracted by the device extracting unit 53, the transfer target determining unit 18 selects the second subscriber who is the first subscriber profile to be transferred. Determine your profile. Also, the transfer unit 19 transfers the second subscriber profile from the HLR/HSS 20 accommodating the second subscriber profile determined by the transfer target determination unit 18 to another HLR/HSS 20 .

Next, an example of the operation (method of subscriber information transfer) of the transfer control device 10B will be described. FIG. 12 is a flow chart showing an example of the operation of the transfer control device 10B.

In step S11, the traffic information acquisition unit 11 acquires traffic information (see FIG. 3) regarding the communication volume for each HLR/HSS 20 (in this embodiment, the communication volume subdivided for each subscriber profile). The traffic information acquisition unit 11 collects traffic information from each HLR/HSS 20 in real time and stores the traffic information in the traffic information storage unit 12 .

In step S12, the target device detection unit 51 detects the HLR/HSS 20 (target device) whose communication volume exceeds a predetermined reference volume based on the traffic information collected in real time as described above.

In step S<b>13 , the existing area extracting unit 52 detects traffic volume increase factors for each subscriber profile contained in the HLR/HSS 20 (target device) detected by the target device detecting unit 51 . A visiting area (specific visiting area) corresponding to a certain subscriber profile is extracted. The details of the processing by the existing area extraction unit 52 are as described above.

In step S14, the device extracting unit 53 extracts a subscriber profile (first subscriber profile) related to a user who resides in the specific visiting area (here, "Tokyo A" as an example) extracted by the visiting area extracting unit 52. (see FIG. 11).

The processes of steps S15 and S16 are the same as the processes of steps S6 and S7 in FIG.

According to the handover control device 10B described above, it is possible to detect the HLR/HSS 20 (target device) whose communication volume exceeds the reference volume based on the traffic information periodically acquired from each HLR/HSS 20 . Furthermore, based on the communication volume for each subscriber profile accommodated in the target device, a location area (specified location area) corresponding to the subscriber profile that is the cause of the increase in communication volume is extracted, and the specific location area is extracted. It is possible to equalize the number of accommodated first subscriber profiles for users residing in a specific service area between the HLR/HSS 20 by executing reaccommodation of first subscriber profiles relating to users residing in a specific service area. becomes. That is, it is possible to solve the situation where many first subscriber profiles are unevenly distributed in a specific HLR/HSS 20 (that is, target device). As a result, it is possible to reduce the amount of communication to the target device caused by accessing the first subscriber profile. In particular, according to the handover control device 10B, when the communication volume for a specific HLR/HSS 20 exceeds the reference volume due to the occurrence of an unpredictable situation such as a disaster, traffic concentration for the specific HLR/HSS 20 can be mitigated.

Since the transfer control device 10A and the transfer control device 10B have different timings for transferring the subscriber profile, the transfer control device 10A and the transfer control device 10B can be combined with each other. That is, the transfer control device according to the present disclosure may be configured as a device having both the functions of the transfer control device 10A and the transfer control device 10B. In this case, even if the transfer control of the transfer control device 10A fails to prevent the unevenness of the traffic to the HLR/HSS 20, the transfer control of the transfer control device 10B suppresses the unevenness of the traffic to the HLR/HSS 20 after the fact. It becomes possible to That is, the function of the transfer control device 10B can complement the function of the transfer control device 10A.

It should be noted that the block diagrams used in the description of the above embodiments show blocks in units of functions. These functional blocks (components) are realized by any combination of at least one of hardware and software. Also, the method of implementing each functional block is not particularly limited. That is, each functional block may be implemented using one device that is physically or logically coupled, or directly or indirectly using two or more devices that are physically or logically separated (e.g. , wired, wireless, etc.) and may be implemented using these multiple devices. A functional block may be implemented by combining software in the one device or the plurality of devices.

Functions include judging, determining, determining, calculating, calculating, processing, deriving, investigating, searching, checking, receiving, transmitting, outputting, accessing, resolving, selecting, choosing, establishing, comparing, assuming, expecting, assuming, Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc. can't

For example, the transfer control devices 10A and 10B according to an embodiment of the present disclosure may function as computers that perform the information processing method of the present disclosure. FIG. 13 is a diagram illustrating an example of a hardware configuration of transfer control devices 10A and 10B according to an embodiment of the present disclosure. The transfer control devices 10A and 10B described above may physically be configured as computer devices including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

Note that in the following description, the term "apparatus" can be read as a circuit, device, unit, or the like. The hardware configuration of the transfer control devices 10A and 10B may be configured to include one or more of the devices shown in FIG. 13, or may be configured without some of the devices.

Each function of the transfer control devices 10A and 10B is performed by the processor 1001 performing calculations and controlling communication by the communication device 1004 by loading predetermined software (programs) onto hardware such as the processor 1001 and the memory 1002. , and controlling at least one of reading and writing of data in the memory 1002 and the storage 1003 .

The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like.

The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least part of the operations described in the above embodiments is used. For example, the transfer target determining unit 18 may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and other functional blocks may be implemented in the same way. Although it has been explained that the above-described various processes are executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. FIG. Processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via an electric communication line.

The memory 1002 is a computer-readable recording medium, and is composed of at least one of, for example, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), and RAM (Random Access Memory). may be The memory 1002 may also be called a register, cache, main memory (main storage device), or the like. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing an information processing method according to an embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, for example, an optical disc such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disc, a magneto-optical disc (for example, a compact disc, a digital versatile disc, a Blu-ray disk), smart card, flash memory (eg, card, stick, key drive), floppy disk, magnetic strip, and/or the like. Storage 1003 may also be called an auxiliary storage device. The storage medium described above may be, for example, a database, server, or other suitable medium including at least one of memory 1002 and storage 1003 .

The communication device 1004 is hardware (transmitting/receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 includes a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like, for example, in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). may consist of

The input device 1005 is an input device (for example, keyboard, mouse, microphone, switch, button, sensor, etc.) that receives input from the outside. The output device 1006 is an output device (eg, display, speaker, LED lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated (for example, a touch panel).

Devices such as the processor 1001 and the memory 1002 are connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between devices.

Further, the transfer control devices 10A and 10B are hardware such as microprocessors, digital signal processors (DSPs), ASICs (Application Specific Integrated Circuits), PLDs (Programmable Logic Devices), and FPGAs (Field Programmable Gate Arrays). , and part or all of each functional block may be implemented by the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.

Although the present embodiments have been described in detail above, it will be apparent to those skilled in the art that the present embodiments are not limited to the embodiments described herein. This embodiment can be implemented as modifications and changes without departing from the spirit and scope of the present invention defined by the description of the claims. Therefore, the description in this specification is for the purpose of illustration and explanation, and does not have any restrictive meaning with respect to the present embodiment.

Notification of information is not limited to the aspects/embodiments described in this disclosure, and may be performed using other methods. For example, notification of information includes physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof. RRC signaling may also be called an RRC message, and may be, for example, an RRC connection setup message, an RRC connection reconfiguration message, or the like.

The processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in this disclosure may be rearranged as long as there is no contradiction. For example, the methods described in this disclosure present elements of the various steps using a sample order, and are not limited to the specific order presented.

Information, etc., may be output from a higher layer (or lower layer) to a lower layer (or higher layer). It may be input and output via multiple network nodes.

Input/output information and the like may be stored in a specific location (for example, memory), or may be managed using a management table. Input/output information and the like can be overwritten, updated, or appended. The output information and the like may be deleted. The entered information and the like may be transmitted to another device.

The determination may be made by a value represented by one bit (0 or 1), by a true/false value (Boolean: true or false), or by numerical comparison (for example, a predetermined value).

Each aspect/embodiment described in the present disclosure may be used alone, may be used in combination, or may be used by switching according to execution. In addition, the notification of predetermined information (for example, notification of “being X”) is not limited to being performed explicitly, but may be performed implicitly (for example, not notifying the predetermined information). good too.

Software, whether referred to as software, firmware, middleware, microcode, hardware description language or otherwise, includes instructions, instruction sets, code, code segments, program code, programs, subprograms, and software modules. , applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.

Software, instructions, information, etc. may also be sent and received over a transmission medium. For example, the software uses wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.) to create websites, Wired and/or wireless technologies are included within the definition of transmission medium when sent from a server or other remote source.

Information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. may be represented by a combination of

The terms explained in this disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, the channel and/or symbols may be signaling. A signal may also be a message.

As used in this disclosure, the terms "system" and "network" are used interchangeably.

In addition, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values from a predetermined value, or may be expressed using other corresponding information. may be represented. For example, radio resources may be indexed.

The names used for the parameters described above are not limiting names in any way. Further, the formulas, etc., using these parameters may differ from those expressly disclosed in this disclosure. The various names assigned to these various information elements are not limiting names in any way, as the various information elements can be identified by any suitable name.

As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Judgement", "determining" are, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (eg, lookup in a table, database, or other data structure), ascertaining as "judged" or "determined", and the like. Also, "judgment" and "determination" are used for receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, access (accessing) (for example, accessing data in memory) may include deeming that a "judgment" or "decision" has been made. In addition, "judgment" and "decision" are considered to be "judgment" and "decision" by resolving, selecting, choosing, establishing, comparing, etc. can contain. In other words, "judgment" and "decision" can include considering that some action is "judgment" and "decision". Also, "judgment (decision)" may be read as "assuming", "expecting", "considering", or the like.

As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly specified otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

Any reference to elements using the "first," "second," etc. designations used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, reference to a first and second element does not imply that only two elements can be employed or that the first element must precede the second element in any way.

Where "include," "including," and variations thereof are used in this disclosure, these terms are inclusive, as is the term "comprising." is intended. Furthermore, the term "or" as used in this disclosure is not intended to be an exclusive OR.

In this disclosure, where articles have been added by translation, such as a, an, and the in English, the disclosure may include the plural nouns following these articles.

In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean that "A and B are different from C". Terms such as "separate," "coupled," etc. may also be interpreted in the same manner as "different."

10A, 10B... transfer control device, 11... traffic information acquisition unit, 13... event information acquisition unit, 15... target period acquisition unit, 16... user extraction unit, 17... device extraction unit, 18... transfer target determination unit, 19... Transfer unit 20 HLR/HSS (subscriber information management device) 51 target device detection unit 52 existing area extraction unit 53 device extraction unit.

Claims (6)

Among a plurality of pieces of subscriber information distributed and accommodated in a plurality of subscriber information management devices, subscriptions related to users who are located in a specific area each include information indicating the areas in which users subscribing to mobile communication services reside. a target period acquisition unit that acquires a future target period in which the amount of communication regarding user information is expected to exceed a predetermined reference amount;
a user extracting unit that extracts users predicted to be in the specific area during the target period based on the correspondence relationship between the subscriber information and the subscriber information management device in a period prior to the target period; ,
a device extraction unit for extracting the subscriber information management device containing the first subscriber information, which is the subscriber information related to the user extracted by the user extraction unit;
Second subscriber information, which is the first subscriber information to be transferred, is determined based on the number of the first subscriber information stored in the subscriber information management device extracted by the device extraction unit. a transfer target determination unit to
a transfer unit for transferring the second subscriber information from the subscriber information management device storing the second subscriber information to another subscriber information management device;
a transfer control device. further comprising a traffic information acquisition unit that acquires traffic information related to traffic for each subscriber information,
Based on the traffic information, the target period acquisition unit acquires a high traffic period in which the communication volume of subscriber information related to users residing in the specific area exceeds the reference volume, and acquires the same as the high traffic period. or a future period having similar attributes as the target period. further comprising an event information acquisition unit that acquires event information including information on the holding period and holding area of future events,
2. The transfer according to claim 1, wherein the target period acquisition unit acquires an area corresponding to the event area included in the event information as the specific area, and acquires the event period included in the event information as the target period. Control device. further comprising a traffic information acquisition unit that acquires traffic information related to traffic for each subscriber information,
The target period acquisition unit,
Based on the traffic information during the past event period corresponding to the event associated with the event information, the subscriber information about the user who was in the holding area during the past event holding period. Determining whether the amount of communication exceeds the reference amount,
When it is determined that the communication volume exceeds the reference volume, the area corresponding to the holding area included in the event information is set as the specific area, and the holding period included in the event information is obtained as the target period. 4. The transfer control device of claim 3, wherein: The user extracting unit identifies users who were in the holding area during the holding period of the past event corresponding to the event associated with the event information as users who are predicted to be in the specific area during the target period. 5. A transfer control device according to claim 3 or 4, extracting. From each of a plurality of subscriber information management devices distributingly accommodating a plurality of subscriber information each including information indicating the coverage area of a user subscribing to a mobile communication service, the amount of communication to the subscriber information management device is calculated. an acquisition unit that periodically acquires information indicating
a target device detection unit that detects a target device, which is the subscriber information management device, in which the communication volume exceeds a predetermined reference volume;
a visiting area extracting unit for extracting a visiting area corresponding to the subscriber information, which is a cause of an increase in communication traffic, based on the communication traffic for each of the subscriber information stored in the target device;
a device extraction unit for extracting the subscriber information management device containing the first subscriber information, which is the subscriber information related to the user residing in the visited area extracted by the visited area extraction unit;
Transfer of determining second subscriber information, which is the first subscriber information to be transferred, based on the number of the first subscriber information stored in the information management device extracted by the device extraction unit a target determination unit;
a transfer unit for transferring the second subscriber information from the subscriber information management device storing the second subscriber information to another subscriber information management device;
a transfer control device.

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