Communication system, communication control device, communication method, and mobile device

The present invention relates to a communication system that controls communication of a mobile device, a communication control device and a mobile device used in this communication system, and a communication method that controls communication of the mobile device.

Conventionally, there is a communication system that performs data communication between mobile devices using GPRS (General Packet Radio Service). In such a communication system, a GGSN (Gateway GPRS Support Node) that connects different networks and a plurality of SGSNs (Service GPRS Support Nodes) that are arranged below the GGSN are provided, and the mobile device is a mobile device. , SGSN and GGSN to connect to the destination network. In addition, there is a communication service using a so-called prepaid mobile device, in which a communication usage fee is paid in advance and communication of the mobile device is possible within the range of the paid fee. As a system in which a prepaid mobile device is applied to a communication system using GPRS, for example, there is one described in Patent Document 1.

<p><patcit num="1"><text>Japanese Patent Application Laid-Open No. 2005-204323</text></patcit></p>

<p> Generally, in a communication system using GPRS, when controlling the communication of a prepaid mobile device, the remaining communication that the mobile device can communicate with for each APN (Access Point Name) when the mobile device connects to the communication network. It is conceivable to manage the amount. The management of the remaining communication amount for each APN is performed by a device other than the mobile device, and the user of the mobile device (subscriber of the mobile device) may not know the remaining communication amount for each APN. In this case, there is a problem that the convenience is lacking, for example, the user of the mobile device cannot perform communication through the APN even though there is an APN in which the remaining communication amount remains.</p><p> Therefore, an object of the present invention is to provide a communication system, a communication control device, a communication method, and a mobile device capable of making a more convenient communication connection.</p>

<p> Therefore, the present invention indicates a communication control device that acquires connection destination information indicating a connection destination when connecting to a communication network from a mobile device and controls communication of the mobile device based on the connection destination information, and the connection destination information indicates. A communication system including a residual communication amount storage device that stores the remaining communication amount that the mobile device can communicate with through the connection destination in association with the identification information that can identify the subscriber who uses the mobile device. , The communication control device uses the identification information acquisition means for acquiring the identification information and the connection destination information from the mobile device, and the identification information and the connection destination information based on the identification information and the connection destination information acquired by the identification information acquisition means. Residual communication amount acquisition means for acquiring the remaining communication amount of the corresponding mobile device, communication amount measuring means for measuring the communication amount after the mobile device starts communication, and residual communication acquired by the remaining communication amount acquisition means. Based on the amount and the communication amount measured by the communication amount measuring means, the remaining communication amount calculating means for calculating the remaining communication amount that the mobile device can communicate with and the remaining communication amount calculated by the remaining communication amount calculating means Based on this, if it is determined by the communication availability determination means that determines whether the communication of the mobile device can be continued and the communication availability determination means that the communication of the mobile device cannot be continued, the connection destination where the remaining communication amount remains. It is provided with a connection destination information extraction means for extracting the connection destination information of the connection destination information and a connection destination information notification means for notifying the mobile device of the connection destination information extracted by the connection destination information extraction means. The connection destination information that acquires the connection destination information notified from the means and the connection destination information acquired by the connection destination information acquisition means is transmitted to the communication control device at the start of the communication connection to the communication network. It is characterized by comprising a transmission means.</p><p> Further, the present invention is a communication control device that acquires connection destination information indicating a connection destination when connecting to a communication network from a mobile device and controls communication of the mobile device based on the connection destination information. Based on the identification information that can identify the subscriber who uses the mobile device and the identification information acquisition means that acquires the connection destination information, and the identification information and the connection destination information acquired by the identification information acquisition means, the connection destination information Remaining communication amount acquisition means for acquiring the remaining communication amount that the mobile device can communicate with through the connection destination indicated by, communication amount measuring means for measuring the communication amount after the mobile device starts communication, and remaining communication amount acquisition means. Calculated by the remaining communication amount calculating means for calculating the remaining communication amount that the mobile device can communicate with and the remaining communication amount calculating means based on the remaining communication amount acquired in the above and the communication amount measured by the communication amount measuring means. If it is determined by the communication availability judgment means that determines whether or not the communication of the mobile device can be continued based on the remaining communication amount and the communication possibility determination means that the communication of the mobile device cannot be continued, the remaining communication amount It is provided with a connection destination information extraction means for extracting the connection destination information of the remaining connection destination and a connection destination information notification means for notifying the mobile device of the connection destination information extracted by the connection destination information extraction means. It is a feature.</p><p> Further, the present invention provides a communication control device that acquires connection destination information indicating a connection destination when connecting to a communication network from a mobile device and controls communication of the mobile device based on the connection destination information, and connection destination information. Executed in a communication system configured to include a residual communication amount storage device that stores the remaining communication amount that the mobile device can communicate with through the connection destination shown in association with the identification information that can identify the subscriber who uses the mobile device. The communication method is the identification information acquisition step in which the communication control device acquires the identification information and the connection destination information from the mobile device, and the identification information and the connection destination information acquired in the identification information acquisition step by the communication control device. Based on the above, the remaining communication amount acquisition step of acquiring the remaining communication amount of the mobile device corresponding to the identification information and the connection destination information, and the communication in which the communication control device measures the communication amount after the mobile device starts communication. The amount measurement step and the communication control device calculate the remaining communication amount that the mobile device can communicate with based on the remaining communication amount acquired in the remaining communication amount acquisition step and the communication amount measured in the communication amount measurement step. In the communication availability determination step and the communication availability determination step in which the communication control device determines whether or not the communication of the mobile device can be continued based on the residual communication amount calculated in the residual communication amount calculation step. When it is determined that the communication of the mobile device cannot be continued, the communication control device extracts the connection destination information of the connection destination where the remaining communication amount remains, and the communication control device sets the connection destination information extraction step. A connection destination information notification step that notifies the mobile device of the connection destination information extracted in the connection destination information extraction step, and a connection destination information acquisition step in which the mobile device acquires the connection destination information notified in the connection destination information notification step. The mobile device has a connection destination information transmission step of transmitting the connection destination information acquired in the connection destination information acquisition step to the communication control device at the start of the communication connection to the communication network.</p><p> In these inventions, when it is determined that communication of the mobile device cannot be continued based on the remaining communication amount during the communication of the mobile device, the connection destination information of the connection destination where the remaining communication amount remains. Is extracted, and the extracted connection destination information is notified to the mobile device. The mobile device acquires the information of the connection destination with the remaining communication amount, and at the start of communication, transmits the connection destination information with the remaining communication amount to the communication control device to perform communication. In this way, the mobile device can grasp the connection destination information with the remaining communication amount and perform communication based on the connection destination information with the remaining communication amount, so that the communication connection is more convenient. It can be performed.</p><p> Further, the connection destination information extraction means extracts a plurality of connection destination information, and the connection destination information notification means notifies the mobile device of a plurality of connection destination information extracted by the connection destination information extraction means. A connection destination information selection means for selecting connection destination information satisfying a predetermined condition from a plurality of connection destination information acquired by the connection destination information acquisition means is further provided, and the connection destination information transmission means is provided by the connection destination information selection means. It is preferable to transmit the selected connection destination information to the communication control device. In this case, since communication can be performed based on the connection destination information satisfying a predetermined condition from a plurality of connection destination information, it is possible to perform a communication connection based on more suitable connection destination information.</p><p> Further, the mobile device further includes a priority storage means for storing a plurality of connection destination information in association with the priority when connecting to the connection destination indicated by each connection destination information, and the connection destination information selection means is It is preferable to select the connection destination information having the highest priority among the plurality of connection destination information acquired by the connection destination information acquisition means based on the priority stored in the priority storage means. In this case, the connection destination information can be easily selected from the plurality of connection destination information based on the priority order associated with each connection destination information in advance.</p><p> Further, the connection destination information notification means adds a priority to a plurality of connection destination information extracted by the connection destination information extraction means and notifies the mobile device, and the connection destination information selection means is added to the connection destination information. It is preferable to select the connection destination information based on the priority. In this case, the connection destination information selection means can select the connection destination information based on the priority order notified from the connection destination information notification means.</p><p> Further, the connection destination information notification means adds the remaining communication amount corresponding to each connection destination information to each of the plurality of connection destination information extracted by the connection destination information extraction means, and notifies the mobile device. , It is preferable that the connection destination information selection means selects the connection destination information based on the remaining communication amount added to the connection destination information. In this case, the connection destination information selection means can select the connection destination information based on the remaining communication amount.</p><p> Further, as the connection destination information selection means, when selecting the connection destination information from a plurality of connection destination information, it is preferable that the connection destination information is selected by the application program that has started the communication in the mobile device or the user of the mobile device. .. In this case, the user of the application program or mobile device that has activated the communication can select the connection destination information, which improves convenience.</p><p> Further, the present invention provides a communication control device that acquires connection destination information indicating a connection destination when connecting to a communication network from a mobile device and controls communication of the mobile device based on the connection destination information, and connection destination information. It is a communication system including a residual communication amount storage device that stores the remaining communication amount that the mobile device can communicate with through the connection destination shown in association with the identification information that can identify the subscriber who uses the mobile device. The communication control device is based on the identification information acquisition means for acquiring the identification information and the connection destination information from the mobile device that requested the start of the communication connection, and the identification information and the connection destination information acquired by the identification information acquisition means. Therefore, whether or not the mobile device can be connected based on the remaining communication amount acquisition means for acquiring the remaining communication amount of the mobile device corresponding to the identification information and the connection destination information and the remaining communication amount acquired by the remaining communication amount acquisition means. When it is determined by the communication availability judgment means and the communication availability judgment means that the communication connection of the mobile device is not possible, the connection destination information of the connection destination where the remaining communication amount remains is extracted. It is characterized by including means and communication connection means for making a communication connection of a mobile device based on the connection destination information extracted by the connection destination information extraction means.</p><p> Further, the present invention is a communication control device that acquires connection destination information indicating a connection destination when connecting to a communication network from a mobile device and controls communication of the mobile device based on the connection destination information, and is a communication connection. Identification information acquisition means for acquiring identification information and connection destination information that can identify the subscriber who uses the mobile device from the mobile device that made the start request, and identification information and connection destination information acquired by the identification information acquisition means. Based on the remaining communication amount acquisition means for acquiring the remaining communication amount that the mobile device can communicate with through the connection destination indicated by the connection destination information, and the remaining communication amount acquired by the remaining communication amount acquisition means, the mobile device When it is determined that the communication connection of the mobile device is not possible by the communication availability judgment means for determining the communication connection availability and the communication availability determination means, the connection destination information of the connection destination where the remaining communication amount remains is extracted. It is characterized by including a connection destination information extraction means and a communication connection means for making a communication connection of a mobile device based on the connection destination information extracted by the connection destination information extraction means.</p><p> Further, the present invention provides a communication control device that acquires connection destination information indicating a connection destination when connecting to a communication network from a mobile device and controls communication of the mobile device based on the connection destination information, and connection destination information. Executed in a communication system configured to include a residual communication amount storage device that stores the remaining communication amount that the mobile device can communicate with through the connection destination shown in association with the identification information that can identify the subscriber who uses the mobile device. In the communication method, the communication control device acquires the identification information and the connection destination information from the mobile device that requested the start of the communication connection, and the communication control device performs the identification information acquisition step. Based on the acquired identification information and connection destination information, the remaining communication amount acquisition step for acquiring the remaining communication amount of the mobile device corresponding to the identification information and the connection destination information, and the communication control device acquire the remaining communication amount acquisition step. When it is determined in the communication availability determination step that determines whether or not the mobile device can be connected based on the remaining communication amount and the communication enable / disable determination step, the communication control device determines that the communication connection of the mobile device is not possible. , The communication control device makes a communication connection of the mobile device based on the connection destination information extracted in the connection destination information extraction step and the connection destination information extraction step that extracts the connection destination information of the connection destination where the remaining communication amount remains. It is characterized by having a communication connection step for performing the above.</p><p> In these inventions, when it is determined that communication of the mobile device cannot be continued based on the remaining communication amount at the start of communication of the mobile device, the connection destination information of the connection destination where the remaining communication amount remains. Is extracted, and the communication connection of the mobile device is performed based on the extracted connection destination information. As a result, when there is no remaining communication amount, the communication of the mobile device is connected based on the connection destination information in which the remaining communication amount remains, so that the user of the mobile device can connect to the connection destination where the remaining communication amount remains. It is not necessary to switch to an information-based communication connection, and a more convenient communication connection can be made.</p><p> Further, the communication control device further includes an inquiry means for inquiring the user of the mobile device whether or not to connect to the connection destination indicated by the connection destination information extracted by the connection destination information extraction means, and the communication connection means makes an inquiry. It is preferable to connect the mobile device to the connection destination to which the inquiry was made based on the result of the inquiry by the means. In this case, by making a communication connection based on the inquiry result, it is possible to make a communication connection reflecting the intention of the user.</p><p> Further, it is preferable that the communication control device further includes a connection result notification means for notifying the mobile device of the connection destination information indicating the connection destination to which the mobile device is connected by the communication connection means. In this case, since the connection destination information to which the mobile device is connected is notified to the mobile device, the user of the mobile device can know the connection destination.</p><p> Further, the present invention provides a communication control device that acquires connection destination information indicating a connection destination when connecting to a communication network from a mobile device and controls communication of the mobile device based on the connection destination information, and connection destination information. It is a communication system including a residual communication amount storage device that stores the remaining communication amount that the mobile device can communicate with through the connection destination shown in association with the identification information that can identify the subscriber who uses the mobile device. The communication control device is based on the identification information acquisition means for acquiring the identification information and the connection destination information from the mobile device and the identification information and the connection destination information acquired by the identification information acquisition means, and the identification information and the connection destination information. The remaining communication amount acquisition means for acquiring the remaining communication amount of the mobile device corresponding to the above, the communication amount measuring means for measuring the communication amount after the mobile device starts communication, and the remaining communication amount acquired by the remaining communication amount acquisition means. Residual communication amount calculating means for calculating the remaining communication amount that the mobile device can communicate with based on the communication amount and the communication amount measured by the communication amount measuring means, and the remaining communication amount calculated by the remaining communication amount calculating means. If it is determined by the communication availability determination means that determines whether the communication of the mobile device can be continued and the communication availability determination means that the communication of the mobile device cannot be continued based on the above, the connection with the remaining communication amount remaining. It is provided with a connection destination information extraction means for extracting destination information, and a communication control device side reconnection means for controlling communication of a mobile device based on the connection destination information extracted by the connection destination information extraction means. It is characterized by that.</p><p> Further, the present invention is a communication control device that acquires connection destination information indicating a connection destination when connecting to a communication network from a mobile device and controls communication of the mobile device based on the connection destination information. Based on the identification information that can identify the subscriber who uses the mobile device and the identification information acquisition means that acquires the connection destination information, and the identification information and the connection destination information acquired by the identification information acquisition means, the connection destination information Remaining communication amount acquisition means for acquiring the remaining communication amount that the mobile device can communicate with through the connection destination indicated by, communication amount measuring means for measuring the communication amount after the mobile device starts communication, and remaining communication amount acquisition means. Calculated by the remaining communication amount calculating means and the remaining communication amount calculating means for calculating the remaining communication amount that the mobile device can communicate with based on the remaining communication amount acquired in the above and the communication amount measured by the communication amount measuring means. If it is determined by the communication availability judgment means that determines whether or not the communication of the mobile device can be continued based on the remaining communication amount and the communication possibility determination means that the communication of the mobile device cannot be continued, the remaining communication amount Reconnect to the communication control device side that controls the communication of the mobile device based on the connection destination information extraction means that extracts the connection destination information of the remaining connection destination and the connection destination information extracted by the connection destination information extraction means. It is characterized by providing means.</p><p> Further, the present invention provides a communication control device that acquires connection destination information indicating a connection destination when connecting to a communication network from a mobile device and controls communication of the mobile device based on the connection destination information, and connection destination information. Executed in a communication system configured to include a residual communication amount storage device that stores the remaining communication amount that the mobile device can communicate with through the connection destination shown in association with the identification information that can identify the subscriber who uses the mobile device. The communication method is the identification information acquisition step in which the communication control device acquires the identification information and the connection destination information from the mobile device, and the identification information and the connection destination information acquired in the identification information acquisition step by the communication control device. Based on the above, the remaining communication amount acquisition step of acquiring the remaining communication amount of the mobile device corresponding to the identification information and the connection destination information, and the communication in which the communication control device measures the communication amount after the mobile device starts communication. The amount measurement step and the communication control device calculate the remaining communication amount that the mobile device can communicate with based on the remaining communication amount acquired in the remaining communication amount acquisition step and the communication amount measured in the communication amount measurement step. In the communication availability determination step and the communication availability determination step, in which the communication control device determines whether or not the communication of the mobile device can be continued based on the residual communication volume calculated in the residual communication volume calculation step. When it is determined that the communication of the mobile device cannot be continued, the communication control device extracts the connection destination information of the connection destination where the remaining communication amount remains, and the communication control device sets the connection destination information extraction step. It is characterized by having a communication control device side reconnection step that controls communication of a mobile device based on the connection destination information extracted in the connection destination information extraction step.</p><p> In these inventions, when it is determined that communication of the mobile device cannot be continued based on the remaining communication amount during the communication of the mobile device, the connection destination information of the connection destination where the remaining communication amount remains. Is extracted, and the communication of the mobile device is controlled based on the extracted connection destination information. In this way, when the remaining communication amount is exhausted, the communication can be controlled based on the connection destination information in which the remaining communication amount remains, so that a more convenient communication connection can be made.</p><p> Further, the communication control device further includes a reconnection information notification means for notifying the mobile device of the connection destination information extracted by the connection destination information extraction means, and the mobile device is provided with the connection destination information notified from the reconnection information notification means. It is preferable to further provide a mobile device-side reconnection means for making a communication connection based on In this case, the mobile device can make a communication connection based on the connection destination information notified from the communication control device.</p><p> Further, the mobile device according to the present invention can be a mobile device used in the above-mentioned communication system.</p>

<p> According to the present invention, a more convenient communication connection can be made.</p>

<figref num="1">It is a schematic block diagram of the communication system which concerns on 1st to 3rd Embodiment.</figref><figref num="2">It is a figure which shows the specific example of charge management data.</figref><figref num="3">It is a figure which shows the detailed structure of SGSN which concerns on 1st Embodiment.</figref><figref num="4">It is a figure which shows the hardware configuration of SGSN which concerns on 1st Embodiment.</figref><figref num="5">It is a figure which shows the detailed structure of the mobile machine which concerns on 1st Embodiment.</figref><figref num="6">It is a sequence diagram which shows the flow of the process performed in the mobile machine and SGSN which concerns on 1st Embodiment.</figref><figref num="7">It is a figure which shows the detailed structure of the SGSN which concerns on the 2nd Embodiment.</figref><figref num="8">It is a flowchart which shows the flow of the process performed in SGSN which concerns on 2nd Embodiment.</figref><figref num="9">It is a figure which shows the detailed structure of SGSN which concerns on 3rd Embodiment.</figref><figref num="10">It is a figure which shows the detailed structure of the mobile machine which concerns on 3rd Embodiment.</figref><figref num="11">It is a sequence diagram which shows the flow of the process performed in the mobile machine, SGSN and GGSN which concerns on 3rd Embodiment.</figref>

Hereinafter, a preferred embodiment of the communication system, the communication control device, the communication method, and the communication system to which the mobile device is applied will be described with reference to the drawings. In the description of the drawings, the same elements are designated by the same reference numerals, and duplicate description will be omitted.

[First Embodiment] FIG. 1 is a schematic configuration diagram of a communication system according to the first embodiment. As shown in FIG. 1, the communication system 1 is a communication system using GPRS, and includes a prepaid mobile device 10, an SGSN (communication control device) 20, a GGSN30, a service control device 40, and a network 50. Will be done.

The mobile device 10 is a mobile communication terminal, and communicates with a network 50 as a communication destination via SGSN20 and GGSN30. Further, the mobile device 10 is a prepaid communication terminal, and performs packet communication within a range of charges paid in advance. Further, at the start of communication, the mobile device 10 informs the SGSN20 of the identification information of the subscriber who uses the mobile device 10 (specifically, the identification information of the SIM card) and the APN when connecting to the communication network. Sends APN information (connection destination information) that can identify (connection destination). The details of the processing in the mobile device 10 will be described in detail later.

The SGSN20 wirelessly communicates with the mobile device 10 located in a predetermined area managed by the SGSN20, and connects the mobile device 10 and the GGSN30. Usually, there are a plurality of SGSN20s in the communication area. The SGSN 20 also controls the communication of the mobile device 10 based on the charge management data acquired from the service control device 40. The communication control based on the charge management data in SGSN20 will be described in detail later.

The GGSN30 is a node having a gateway function with other data communication networks such as the Internet. There are usually a plurality of GGSN30s in the communication network.

The service control device 40 stores charge management data for providing a prepaid communication connection service to the mobile device 10. Specifically, this charge management data can be used for communication connection through the identification information of the subscriber who uses the mobile device 10, the APN information that can identify the APN when the mobile device 10 is connected to the communication network, and the APN. It is associated with the remaining traffic. Here, FIG. 2 shows a specific example of charge management data. As shown in FIG. 2, in the charge management data, a plurality of APN information and the remaining communication amount are associated with one subscriber identification information. For example, for the subscriber of the identification information "A001", the APN information "APN_ # 1, APN_ # 2, APN_ # 3" and the remaining communication amount "10,0,20" are associated with each other.

In addition, the service control device 40 updates the charge management data based on the remaining communication amount received from the SGSN 20, and updates the charge management data when the user of the mobile device 10 pays the charge. To do. As the service control device 40, an HLR (Home Location Register) can be used.

Next, the details of SGSN20 will be described. FIG. 3 is a detailed configuration diagram of the SGSN shown in FIG. As shown in FIG. 3, the SGSN 20 includes a communication control unit 200, a connection destination information extraction unit (connection destination information extraction means) 201, and a connection destination information notification unit (connection destination information notification means) 202. Further, the communication control unit 200 includes an identification information acquisition unit (identification information acquisition means) 211, a charge management data acquisition unit (remaining communication amount acquisition means) 212, a charge management data storage unit (remaining communication amount storage device) 213, and a communication amount. It includes a measuring unit (communication amount measuring means) 214, a remaining communication amount calculating unit (remaining communication amount calculating means) 215, a communication availability determination unit (communication availability determination means) 216, and a communication connection unit 217.

The identification information acquisition unit 211 acquires the identification information of the subscriber of the mobile device 10 and the APN information of the APN used for the communication connection from the connection request signal of the mobile device 10 that has made the communication connection start request. ..

The charge management data acquisition unit 212 has APN information associated with the identification information of the subscriber of the mobile unit 10 from the charge management data stored in the service control device 40 when the mobile unit 10 registers the location. And the remaining communication amount associated with the APN information. Further, the charge management data acquisition unit 212 receives the APN information associated with the identification information of the subscriber of the mobile device 10 from the SGSN that manages the communication in the predetermined area of the movement source of the mobile device 10 at the time of so-called handover. , Acquires the remaining communication volume associated with the APN information. These acquired information are stored in the charge management data storage unit 213 in association with the identification information of the subscriber of the mobile device 10, the APN information, and the remaining communication amount.

Further, the charge management data acquisition unit 212 is based on the identification information and the APN information acquired by the identification information acquisition unit 211 from the charge management data storage unit 213 when the mobile device 10 makes a communication connection start request. , Acquires the remaining communication volume of the mobile device 10 corresponding to the identification information and the APN information.

The communication amount measurement unit 214 measures the communication amount after the mobile device 10 starts communication.

The remaining communication amount calculation unit 215 divides the remaining communication amount acquired by the charge management data acquisition unit 212 when the mobile device 10 makes a communication connection start request and the communication amount measured by the communication amount measurement unit 214. Based on this, the remaining communication amount that the mobile device 10 can communicate with is calculated. This remaining communication amount can be expressed as the remaining communication time that can be communicated or the amount of remaining data.

The communication availability determination unit 216 determines whether or not the communication of the mobile device 10 can be continued based on the remaining communication amount calculated by the remaining communication amount calculation unit 215. Specifically, when the remaining communication amount calculated by the remaining communication amount calculation unit 215 becomes 0 (may be less than a predetermined value), it is assumed that the communication of the mobile device 10 cannot be continued. to decide.

The communication connection unit 217 makes a communication connection of the mobile device 10, and if it is determined by the communication availability determination unit 216 that the communication can be continued, the communication connection is continued. On the other hand, the communication connection unit 217 disconnects the communication when the communication availability determination unit 216 determines that the communication cannot be continued.

When it is determined by the communication availability determination unit 216 that the communication continuation is not possible, the connection destination information extraction unit 201 is associated with the mobile device 10 from the charge management data storage unit 213, and the remaining communication amount remains. Extract the existing APN information. Note that the connection destination information extraction unit 201 can extract all of the plurality of APN information when there is a plurality of APN information for which the remaining communication amount remains.

The connection destination information notification unit 202 notifies the mobile device 10 of the APN information extracted by the connection destination information extraction unit 201. Along with this notification, the connection destination information notification unit 202 notifies the mobile device 10 of the communication disconnection signal. As this notification method, for example, the disconnection signal (Deactivation signal) can be notified by including the APN information. In addition, USSD (Unstructured Supplementary Service) for inquiring the contract information of the user of the mobile device 10 between the mobile device 10 and the SGSN 20A in advance. It is also possible to share the data in which the Data) code and the APN information are associated with each other, and the connection result notification unit 204A transmits the USSD code corresponding to the changed APN information to the mobile device 10. In this case, the connection destination information notification unit 202 notifies the mobile device 10 of the disconnection signal and the USSD code. In addition to the USSD code, you can also send text messages (SMS). Further, the connection destination information notification unit 202 can also add a priority to the APN information when notifying the mobile device 10 of the APN information. This priority may be stored in advance as a list in which the ranking is associated with each APN information, or may be acquired from another storage device or the like. Further, when the connection destination information notification unit 202 notifies the mobile device 10 of the APN information, the connection destination information notification unit 202 can also notify the mobile device 10 of the remaining communication amount associated with the APN information.

Next, the hardware configuration of SGSN20 is shown. FIG. 4 is a diagram showing the hardware configuration of the SGSN. As shown in FIG. 4, the SGSN20 includes a CPU (Central Processing Unit) 251, RAM (Random Access Memory) 252 and ROM (Read Only Memory) 253, which are main storage devices, a communication module 254 for communication, and a hard disk. It is configured as a computer equipped with hardware such as auxiliary storage device 255 and the like. By operating these components, each function of the SGSN20 described above is exhibited.

Next, the details of the mobile device 10 will be described. FIG. 5 is a detailed configuration diagram of the mobile device shown in FIG. As shown in FIG. 5, the mobile device 10 includes a communication connection unit 101, a priority storage unit (priority storage means) 102, a connection destination information transmission unit (connection destination information transmission means) 103, and a connection destination information acquisition unit (connection destination). It includes an information acquisition means) 104 and a connection destination information selection unit (connection destination information selection means) 105.

The communication connection unit 101 controls packet communication performed between the network 50 and the mobile device 10.

The priority storage unit 102 stores a plurality of APN information in association with the priority when connecting to the APN indicated by each APN information. This priority may be set in advance by the subscriber of the mobile device 10, or may be set according to a predetermined condition.

At the start of communication, the connection destination information transmission unit 103 transmits the APN information of the APN to be connected at the time of communication and the identification information of the subscriber of the mobile device 10 to the SGSN 20. The APN information transmitted here may be, for example, previously set by the subscriber of the mobile device 10 and held by the connection destination information transmission unit 103. Further, the connection destination information transmission unit 103 holds the selected APN information when the APN information is selected by the connection destination information selection unit 105 (details will be described later), and the next time communication is performed, the connection destination information transmission unit 103 holds the selected APN information. The APN information selected by the connection destination information selection unit 105 and the identification information are transmitted to the SGSN 20.

The connection destination information acquisition unit 104 acquires the APN information notified from the connection destination information notification unit 202 of the SGSN 20. When a plurality of APN information is notified from the connection destination information notification unit 202, the connection destination information acquisition unit 104 acquires the notified plurality of APN information.

The connection destination information selection unit 105 selects APN information that satisfies a predetermined condition from the APN information acquired by the connection destination information acquisition unit 104. Specifically, the connection destination information selection unit 105 has the highest priority among the plurality of APN information acquired by the connection destination information acquisition unit 104 based on the priority stored in the priority storage unit 102. Select information. Further, when the connection destination information notification unit 202 of the SGSN 20 adds a priority to the APN information, the connection destination information selection unit 105 can select the APN information in consideration of this priority as well. .. In addition, when the remaining communication amount is added to the APN information, the connection destination information selection unit 105 selects the APN information or displays the remaining communication amount on the display screen or the like in consideration of the remaining communication amount. It can also be displayed. Note that the connection destination information selection unit 105 does not select the APN information, but the connection destination information selection unit 105 causes the application program that started the communication of the mobile device 10 or the user of the mobile device 10 to select the APN information. You may do it. For example, the application program can select APN information according to the communication destination of the mobile device 10, or can select APN information based on the remaining communication amount added to the APN information. Since the APN information can be selected by the user of the application program or the mobile device, the convenience when selecting the APN information is improved.

Next, the hardware configuration of the mobile device 10 is shown. Similar to the hardware configuration of SGSN20 shown in FIG. 4, the mobile device 10 includes hardware such as a CPU, RAM and ROM which are main storage devices, a communication module for communication, and an auxiliary storage device such as a hard disk. Configured as a computer. By operating these components, each function of the mobile device 10 described above is exhibited.

Next, the flow of processing performed by the mobile device 10 and the SGSN 20 when the remaining communication amount is exhausted during communication will be described. FIG. 6 is a sequence diagram showing a flow of processing performed by the mobile device and SGSN. At the start of the communication connection, the mobile device 10 transmits a signal of a communication connection start request to the SGSN 20. At this time, the connection destination information transmission unit 103 of the mobile device 10 transmits the signal of the communication connection start request to the SGSN 20 including the identification information and the APN information (step S101).

The identification information acquisition unit 211 of the SGSN 20 acquires the identification information and the APN information from the connection request signal of the mobile device 10 that has made the communication connection start request (step S102). Then, the charge management data acquisition unit 212 of the SGSN 20 acquires the remaining communication amount from the charge management data storage unit 213 based on the identification information and the APN information acquired by the identification information acquisition unit 211 (step S103).

The communication connection unit 217 of the SGSN 20 connects the mobile device 10 to the network 50 (step S104). Here, it is assumed that the remaining communication amount remains. If there is no remaining communication volume, the communication connection unit 217 regulates the communication of the mobile device 10.

When the mobile device 10 is in the communication connection state, the communication volume measuring unit 214 of the SGSN 20 measures the communication volume after the mobile device 10 starts communication (step S105). Then, the remaining communication amount calculation unit 215 of the SGSN 20 calculates the remaining communication amount that the mobile device 10 can communicate with (step S106).

The communication availability determination unit 216 of the SGSN 20 determines whether or not the communication of the mobile device 10 can be continued based on the remaining communication amount calculated by the residual communication amount calculation unit 215 (step S107). If communication can be continued (step S107: YES), the communication amount measurement unit 214 measures the communication amount and the remaining communication amount calculation unit 215 calculates the remaining communication amount until communication cannot be continued. ..

When communication cannot be continued (step S107: NO), the connection destination information extraction unit 201 of SGSN20 is associated with the mobile device 10 from the charge management data storage unit 213, and the remaining communication amount remains. Extract the information (step S108).

The connection destination information notification unit 202 of the SGSN 20 notifies the mobile device 10 of the APN information extracted by the communication availability determination unit 216 and the disconnection signal (step S109). The connection destination information acquisition unit 104 of the mobile device 10 acquires the APN information notified from the connection destination information notification unit 202 of the SGSN 20 and the disconnection signal (step S110). As a result, the communication between the mobile device 10 and the SGSN 20 is disconnected (step S111).

Then, the connection destination information selection unit 105 of the mobile device 10 selects the APN information having a high priority from the APN information acquired by the connection destination information acquisition unit 104 (step S112). The connection destination information transmission unit 103 of the mobile device 10 holds the APN information selected by the connection destination information selection unit 105, and the APN information selected by the connection destination information selection unit 105 is used as the SGSN 20 when communicating next time. Send to (step S113). The subsequent processing is the same as the processing after step S102 described above.

This embodiment is configured as described above, and when it is determined by the communication possibility determination unit 216 of the SGSN20 that the communication of the mobile device 10 cannot be continued based on the remaining communication amount during the communication of the mobile device 10. The connection destination information extraction unit 201 extracts the APN information of the APN in which the remaining communication volume remains, and notifies the mobile device of the extracted APN information. The connection destination information acquisition unit 104 of the mobile device 10 acquires the APN information in which the remaining communication amount remains. Then, at the start of the next communication, the APN information with the remaining communication amount remaining is transmitted to the SGSN20 for communication. In this way, the mobile device 10 can grasp the APN information with the remaining communication amount and perform communication based on the APN information with the remaining communication amount, so that a more convenient communication connection can be made. It can be carried out.

Further, since the mobile device 10 can perform communication based on APN information satisfying a predetermined condition from a plurality of APN information, it is possible to perform a communication connection based on more suitable APN information.

Further, the connection destination information selection unit 105 of the mobile device 10 can easily select APN information from a plurality of APN information based on the priority order associated with each APN information in advance.

In the present embodiment, for example, when the mobile device 10 does not have the priority information associated with the APN information, the SGSN 20 sets the priority in the APN information when the remaining communication volume is exhausted. Then, the mobile device 10 may be notified of the priority information as well as the APN information. Further, on the SGSN20 side, the APN information that can be used by the mobile device 10 may be selected, and the selected APN information may be notified to the mobile device 10.

[Second embodiment] The schematic configuration diagram of the communication system according to the second embodiment is the same as the communication system according to the first embodiment shown in FIG. As shown in FIG. 1, the communication system 1A according to the present embodiment is a communication system using GPRS, and is a prepaid mobile device 10, SGSN (communication control device) 20A, GGSN30, service control device 40, and a network. Consists of including 50.

The mobile device 10 is a mobile communication terminal, and communicates with a network 50 as a communication destination via SGSN20A and GGSN30. Further, the mobile device 10 is a prepaid communication terminal, and performs packet communication within a range of charges paid in advance. In addition, at the start of communication, the mobile device 10 tells the SGSN20A the identification information of the subscriber who uses the mobile device 10 and the APN information (connection destination) that can identify the APN (access point name) when connecting to the communication network. Destination information) and is sent.

The SGSN20A wirelessly communicates with the mobile device 10 located in a predetermined area managed by the SGSN20A, and connects the mobile device 10 and the GGSN30. Usually, there are a plurality of SGSN20A in the communication area. The SGSN20A also controls the communication of the mobile device 10 based on the charge management data acquired from the service control device 40. The processing for starting a communication connection based on the charge management data in the SGSN20A will be described in detail later.

The GGSN 30 and the service control device 40 have the same configuration as the GGSN 30 and the service control device 40 of the first embodiment.

Next, the details of SGSN20A will be described. FIG. 7 is a detailed configuration diagram of the SGSN according to the second embodiment. The SGSN20A includes a communication control unit 200A, a connection destination information extraction unit (connection destination information extraction means) 201A, an inquiry unit (inquiry means) 203A, and a connection result notification unit (connection result notification means) 204A. The communication control unit 200A includes an identification information acquisition unit (identification information acquisition means) 211A, a charge management data acquisition unit (remaining communication amount acquisition means) 212A, a charge management data storage unit (remaining communication amount storage device) 213A, and communication availability. It includes a determination unit (communication availability determination means) 216A and a communication connection unit (communication connection means) 217A.

The identification information acquisition unit 211A acquires the identification information of the subscriber of the mobile device 10 and the APN information used for the communication connection from the connection request signal of the mobile device 10 that has made the communication connection start request.

The charge management data acquisition unit 212A uses the charge management data stored in the service control device 40 when the mobile unit 10 registers the location to obtain the APN information associated with the identification information of the subscriber of the mobile unit 10 and the APN information. Acquires the remaining communication volume associated with the APN information. Further, the charge management data acquisition unit 212A receives the APN information associated with the identification information of the subscriber of the mobile device 10 from the SGSN that manages the communication in the predetermined area of the movement source of the mobile device 10 at the time of so-called handover. , Acquires the remaining communication volume associated with the APN information. These acquired information are stored in the charge management data storage unit 213A in association with the identification information of the subscriber of the mobile device 10, the APN information, and the remaining communication amount.

Further, the charge management data acquisition unit 212A is based on the identification information and the APN information acquired by the identification information acquisition unit 211A from the charge management data storage unit 213A when the mobile device 10 makes a communication connection start request. , Acquires the remaining communication volume of the mobile device 10 corresponding to the identification information and the APN information.

The communication availability determination unit 216A determines whether or not the communication connection of the mobile device 10 is possible based on the remaining communication amount acquired by the charge management data acquisition unit 212A when the mobile device 10 makes a communication connection start request. Specifically, the communication availability determination unit 216A determines that communication connection is not possible when the remaining communication amount is 0 (may be a case of a predetermined value or less).

When the communication connection unit 217A determines that the communication connection is possible by the communication availability determination unit 216A, the communication connection unit 217A communicates with the mobile device 10 based on the APN information extracted by the charge management data acquisition unit 212A at the start of the communication connection. Make a connection. In addition, the communication connection unit 217A connects to the APN that made the inquiry when the inquiry result by the inquiry unit 203A (details will be described later) indicates that it consents to connect to the APN that made the inquiry. Perform the processing to be performed.

When the communication connection possibility determination unit 216A determines that the communication connection is not possible, the connection destination information extraction unit 201A is associated with the mobile device 10 from the charge management data storage unit 213A and remains. Extract APN information with remaining traffic. When the connection destination information extraction unit 201A has a plurality of APN information for which the remaining communication amount remains, for example, the APN having the highest priority is based on the prioritized data of the priority determined for each APN. Information can be extracted.

The inquiry unit 203A inquires the user of the mobile device 10 whether or not to connect to the APN indicated by the APN information extracted by the connection destination information extraction unit 201A.

The connection result notification unit 204A notifies the mobile device 10 of the APN information of the APN to which the mobile device 10 is connected by the communication connection unit 217A. As this notification method, the data in which the USSD code and the APN information are associated with each other is shared in advance between the mobile device 10 and the SGSN20A, and the connection result notification unit 204A uses the APN information after the change to the mobile device 10. This can be done by sending the corresponding USSD code. It can also be done by sending a text message (SMS).

The SGSN20A is a computer equipped with hardware such as a CPU, RAM and ROM which are main storage devices, a communication module for communication, and an auxiliary storage device such as a hard disk, like the SGSN20 of the first embodiment. It is composed. By operating these components, each function of the SGSN20A described above is exhibited.

Next, the flow of the communication connection start processing based on the remaining communication amount of the mobile device 10 performed in the SGSN20A will be described. FIG. 8 is a flowchart showing the flow of communication connection start processing performed by SGSN. When the mobile device 10 requests a communication connection, the communication control unit 200A starts the communication connection process (step S201).

Then, the identification information acquisition unit 211A acquires the identification information and the APN information of the subscriber of the mobile device 10 from the connection request signal transmitted by the mobile device 10 (step S202).

The charge management data acquisition unit 212A acquires the remaining communication amount associated with the identification information acquired by the identification information acquisition unit 211A and the APN information from the charge management data storage unit 213A (step S203). Then, the communication availability determination unit 216A determines whether or not there is a remaining communication amount acquired by the charge management data acquisition unit 212A (step S204). When there is no remaining communication volume (step S204: NO), the connection destination information extraction unit 201A determines whether or not other APN information with remaining communication volume is stored in the charge management data storage unit 213A. Determine (step S205).

When the APN information including the remaining communication amount is stored in the charge management data storage unit 213A (step S205: YES), the connection destination information extraction unit 201A extracts the APN information from the charge management data storage unit 213A (step S205: YES). Step S206).

The inquiry unit 203A moves the inquiry as to whether or not the APN to be connected when connecting the mobile device 10 to the communication network may be changed to the APN indicated by the APN information extracted by the connection destination information extraction unit 201A. This is performed for the user of machine 10 (step S207). Then, the inquiry unit 203A determines whether or not the response from the user of the mobile device 10 to the inquiry approves the change of the APN (step S208).

If the answer to the inquiry is to accept the change of APN (step S208: YES), the communication connection unit 217A includes the APN information indicating the accepted APN in the signal of the communication connection request and sends it to GGSN30. (Step S209). The connection result notification unit 204A notifies the mobile device 10 that the APN to be connected has been changed (step S210). As a result, a communication session between the mobile device 10 and the network 50 is established, and the communication connection start processing in the SGSN 20A is completed.

Further, when there is a remaining amount of remaining communication acquired based on the identification information and the APN information acquired from the communication connection request signal (step S204: YES), the communication connection unit 217A is acquired from the connection request signal. The APN information is included in the communication connection request signal and transmitted to the GGSN30 (step S211). As a result, a communication session between the mobile device 10 and the network 50 is established, and the communication connection start processing in the SGSN 20A is completed.

In addition, when the APN information with the remaining communication volume is not stored in the charge management data storage unit 213A (step S205: NO), and the answer to the inquiry as to whether or not the APN can be changed does not approve the change of the APN. If (step S208: NO), SGSN20A regulates the communication of mobile device 10 (step S212).

This embodiment is configured as described above, and when the communication possibility determination unit 216A of the SGSN 20A determines that the communication of the mobile device 10 cannot be continued based on the remaining communication amount at the start of the communication of the mobile device 10. The connection destination information extraction unit 201A extracts the APN information of the APN in which the remaining communication amount remains, and makes a communication connection of the mobile device 10 based on the extracted APN information. As a result, when there is no remaining communication amount, the communication of the mobile device 10 is connected based on the APN information in which the remaining communication amount remains, so that the user of the mobile device 10 has the remaining communication amount of the APN. It is not necessary to switch to an information-based communication connection, and a more convenient communication connection can be made.

Further, by making a communication connection based on the inquiry result by the inquiry unit 203A, it is possible to make a communication connection reflecting the intention of the user.

Further, since the APN information of the APN to which the mobile device 10 is connected is notified to the mobile device, the user of the mobile device 10 can know the APN of the connection destination.

In the second embodiment, when the remaining communication amount acquired at the start of communication connection is 0, it is determined that there is no remaining communication amount, but when the remaining communication amount is less than or equal to the predetermined remaining communication amount, the remaining communication amount is not remaining. It can also be judged that there is no residue in the quantity. In this case, the connection destination information extraction unit 201A extracts the APN information with the remaining communication volume, and even though the user of the mobile device 10 is presented with the switch to the APN information, the switch is rejected. Then, based on the APN information whose remaining communication amount is less than or equal to the predetermined amount, the communication connection is performed for a predetermined time until the remaining communication amount is exhausted.

[Third Embodiment] The schematic configuration diagram of the communication system according to the third embodiment is the same as the communication system according to the first embodiment shown in FIG. As shown in FIG. 1, the communication system 1B according to the present embodiment is a communication system using GPRS, and is a prepaid mobile device 10B, SGSN (communication control device) 20B, GGSN30, service control device 40, and a network. Consists of including 50.

The mobile device 10B is a mobile communication terminal, and communicates with the network 50 as a communication destination via SGSN20B and GGSN30. Further, the mobile device 10B is a prepaid communication terminal, and performs packet communication within a range of charges paid in advance. In addition, at the start of communication, the mobile device 10B tells the SGSN20B the identification information of the subscriber who uses the mobile device 10B and the APN information (connection destination) that can identify the APN (access point name) when connecting to the communication network. Destination information) and is sent. The details of the processing in the mobile device 10B will be described in detail later.

The SGSN20B wirelessly communicates with the mobile device 10B located in a predetermined area managed by the SGSN20B, and connects the mobile device 10B and the GGSN30. Usually, there are a plurality of SGSN20Bs in the communication area. The SGSN20B also controls the communication of the mobile device 10B based on the charge management data acquired from the service control device 40. Communication control based on charge management data in SGSN20B will be described in detail later.

The GGSN 30 and the service control device 40 have the same configuration as the GGSN 30 and the service control device 40 of the first embodiment.

Next, the details of SGSN20B will be described. FIG. 9 is a detailed configuration diagram of the SGSN according to the third embodiment. As shown in FIG. 9, the SGSN 20B includes a communication control unit 200B, a connection destination information extraction unit (connection destination information extraction means) 201, and a reconnection information notification unit (reconnection information notification means) 205B. The communication control unit 200B includes an identification information acquisition unit (identification information acquisition means) 211, a charge management data acquisition unit (remaining communication amount acquisition means) 212, a charge management data storage unit (remaining communication amount storage device) 213, and a communication amount. Measuring unit (communication amount measuring means) 214, remaining communication amount calculating unit (remaining communication amount calculating means) 215, communication availability determination unit (communication availability determination means) 216, and communication connection unit (communication control device side reconnection means) 217B Consists of including.

The identification information acquisition unit 211, the charge management data acquisition unit 212, the charge management data storage unit 213, the communication amount measurement unit 214, the remaining communication amount calculation unit 215, and the communication availability determination unit 216 are the communication control of the first embodiment. It has the same configuration as each component in the unit 200.

The reconnection information notification unit 205B notifies the GGSN30 and the mobile device 10B of the APN information extracted by the connection destination information extraction unit 201. Specifically, this notification can be given by transmitting PDP data including APN information. In addition to APN information, PDP data includes, for example, Qos information and PDP Type information (IP or PPP).

The communication connection unit 217B makes a communication connection of the mobile device 10B, and if the communication availability determination unit 216 determines that the communication can be continued, the communication connection is continued. On the other hand, the communication connection unit 217B disconnects the communication when the communication availability determination unit 216 determines that the communication cannot be continued. Further, the communication connection unit 217B controls the communication of the mobile device 10B based on the APN information extracted by the connection destination information extraction unit 201.

The SGSN20B is a computer equipped with hardware such as a CPU, RAM and ROM which are main storage devices, a communication module for communication, and an auxiliary storage device such as a hard disk, like the SGSN20 of the first embodiment. It is composed. By operating these components, each function of the SGSN20B described above is exhibited.

Next, the details of the mobile device 10B will be described. FIG. 10 is a detailed configuration diagram of the mobile device according to the third embodiment. As shown in FIG. 10, the mobile device 10B includes a communication connection unit (mobile device side reconnection means) 101B and a connection destination information transmission unit 103B.

The communication connection unit 101B controls packet communication performed between the network 50 and the mobile device 10B. Further, the communication connection unit 101B makes a communication connection based on the APN information notified from the reconnection information notification unit 205B of the SGSN 20B.

At the start of communication, the connection destination information transmission unit 103B transmits the APN information of the APN to be connected at the time of communication and the identification information of the subscriber of the mobile device 10B to the SGSN 20B. It is assumed that the APN information transmitted here is set in advance by a subscriber of the mobile device 10B or the like and is held by the connection destination information transmission unit 103B.

Similar to the SGSN20 of the first embodiment, the mobile device 10B includes hardware such as a CPU, RAM and ROM which are main storage devices, a communication module for communication, and an auxiliary storage device such as a hard disk. Configured as a computer. By operating these components, each function of the mobile device 10B described above is exhibited.

Next, the flow of processing performed by the mobile devices 10B, SGSN20B, and GGSN30 when the remaining communication amount is exhausted during communication will be described. FIG. 11 is a sequence diagram showing a flow of processing performed by the mobile device, SGSN, and GGSN. At the start of the communication connection, the mobile device 10B transmits a signal of a communication connection start request to the SGSN 20B. At this time, the connection destination information transmission unit 103B of the mobile device 10B transmits the signal of the communication connection start request to the SGSN 20B including the identification information and the APN information (step S301).

The identification information acquisition unit 211 of the SGSN 20B acquires the identification information and the APN information from the connection request signal of the mobile device 10B that has made the communication connection start request (step S302). Then, the charge management data acquisition unit 212 of the SGSN 20B acquires the remaining communication amount from the charge management data storage unit 213 based on the identification information and the APN information acquired by the identification information acquisition unit 211 (step S303).

The communication connection unit 217B of the SGSN20B connects the mobile device 10B to the network 50 via the GGSN30 (step S304). Here, it is assumed that the remaining communication amount remains. If there is no remaining communication volume, the communication connection unit 217B regulates the communication of the mobile device 10B.

When the mobile device 10B is in the communication connection state, the communication volume measuring unit 214 of the SGSN 20B measures the communication volume after the mobile device 10B starts communication (step S305). Then, the remaining communication amount calculation unit 215 of the SGSN 20B calculates the remaining communication amount that the mobile device 10B can communicate with (step S306).

The communication availability determination unit 216 of the SGSN 20B determines whether or not the communication of the mobile device 10B can be continued based on the remaining communication volume calculated by the residual communication volume calculation unit 215 (step S307). If communication can be continued (step S307: YES), the communication amount measurement unit 214 measures the communication amount and the remaining communication amount calculation unit 215 calculates the remaining communication amount until communication cannot be continued. ..

When communication cannot be continued (step S307: NO), the connection destination information extraction unit 201 of the SGSN20B is associated with the mobile device 10B from the charge management data storage unit 213, and the remaining communication amount remains. Extract the information (step S308).

The reconnection information notification unit 205B of the SGSN20B notifies the GGSN30 of the APN information extracted by the connection destination information extraction unit 201 (step S309). When the GGSN30 acquires the APN information from the SGSN20B (step S310), the GGSN30 notifies the SGSN20B that the acquisition of the APN information is completed (step S311).

When the reconnection information notification unit 205B of the SGSN20B receives the completion notification from the GGSN30, it also notifies the mobile device 10B of the APN information extracted by the connection destination information extraction unit 201 (step S312). When the communication connection unit 101B of the mobile device 10B acquires the APN information notified from the SGSN20B (step S313), it updates the APN information used for the communication connection with the APN information received from the SGSN20B (step S314), and updates the APN information. Make a communication connection based on the APN information.

Then, the communication connection unit 101B of the mobile device 10B notifies SGSN20B that the update of the APN information is completed (step S315). When the reconnection information notification unit 205B of the SGSN20B acquires the completion notification notified from the mobile device 10B, the remaining communication amount calculation unit 215 performs the residual communication associated with the APN information extracted by the connection destination information extraction unit 201. Based on the amount and the communication amount measured by the communication amount measuring unit 214, the remaining communication amount that the mobile device 10B can communicate with is calculated (step S316).

Then, the reconnection information notification unit 205B has APN information associated with the remaining communication amount determined by the communication availability determination unit 216 that communication cannot be continued (step S307: NO), that is, the old APN information. Is deleted from the charge management data storage unit 213 (step S317). In addition, the reconnection information notification unit 205B notifies the GGSN30 that the old APN information will be deleted (step S318).

When the GGSN30 receives the notification to delete the old APN information from the SGSN20B, it deletes the instructed old APN information (step S319) and notifies the SGSN20B of the completion of the deletion (step S320). The notification of the completion of deletion sent from the GGSN30 is acquired by the reconnection information notification unit 205B of the SGSN20B (step S321). As a result, the communication connection process is performed based on the APN information in which the remaining communication amount remains, which is extracted when the remaining communication amount is exhausted, and the communication connection state is established.

This embodiment is configured as described above, and when it is determined by the communication availability determination unit 216 of the SGSN20B that the communication of the mobile device 10B cannot be continued based on the remaining communication amount during the communication of the mobile device 10B. The connection destination information extraction unit 201 of the SGSN20B extracts the APN information of the APN in which the remaining communication amount remains, and the communication connection unit 217B controls the communication of the mobile device 10B based on the extracted APN information. In this way, when the remaining communication amount is exhausted, communication can be controlled based on the APN information with the remaining communication amount without disconnecting the session, so that a more convenient communication connection can be made. It can be carried out.

In addition, the mobile device 10B can make a communication connection based on the APN information notified from the SGSN 20B.

When the remaining communication amount of the mobile device 10B is exhausted, the communication connection is disconnected for a moment, but immediately, the communication connection is made based on the APN information in which the remaining communication amount remains.

The present invention is not limited to each of the above embodiments. For example, in the first to third embodiments, the connection destination information extraction units 201 and 201A are associated with the mobile device 10 from the charge management data stored in the charge management data storage units 213 and 213A, and the remaining communication amount is reduced. Although the remaining APN information is extracted, it may be extracted directly from the charge management data stored in the service control device (remaining communication amount storage device) 40.

Further, although the mobile devices 10 and 10B are prepaid type mobile devices, they do not have to be dedicated to the prepaid type and may be any mobile device capable of performing prepaid type communication.

The first to third embodiments described above mainly use a communication system based on GPRS. However, it is not limited to such a communication system, and can be appropriately applied to a communication system capable of communicating packet data, and is also applicable to a new communication system such as LTE (Long Term Evolution), for example. Is. At that time, the one corresponding to GGSN30 is P-GW (Packet Data Network Gateway), and the one corresponding to SGSN20, 20A, 20B is MME (Mobility Management Entity) or S-GW (Serving Gateway). The service control device 40 is equivalent to the HSS (Subscriber Information Management Server: Home Subscriber System). A PCRF (Policy and Charging Rule Function) may be used as the service control device 40.

1,1A, 1B ... communication system, 10,10A, 10B ... mobile device, 20,20A, 20B ... SGSN (communication control device), 101B ... communication connection part (mobile device side reconnection) Means), 102 ... Priority storage unit (priority storage means), 103 ... Connection destination information transmission unit (connection destination information transmission means), 104 ... Connection destination information acquisition unit (connection destination information acquisition means) ), 105 ... Connection destination information selection unit (connection destination information selection means), 201,201A ... Connection destination information extraction unit (connection destination information extraction means), 202 ... Connection destination information notification means), 203A. .. Inquiry section (inquiry means), 204A ... Connection result notification section (connection result notification means), 205B ... Reconnection information notification section (reconnection information notification means), 211,211A ... Identification information acquisition section (Identification information acquisition means), 212,212A ... Charge management data acquisition unit (remaining communication amount acquisition means), 213,213A ... Charge management data storage unit (remaining communication amount storage device), 214 ... Communication amount measurement Unit (communication amount measuring means), 215 ... Remaining communication amount calculation unit (remaining communication amount calculation means), 216,216A ... Communication availability judgment unit (communication availability judgment means), 217A ... Communication connection unit (communication Connection means), 217B ... Communication connection (reconnection information notification means).