KR101879306B1 - Method and system for providing data limit service in mobile communication system, packet data network gateway for data limit service - Google Patents

Abstract

The present invention relates to a data limit service technique in a mobile communication system, and in a LTE / EPC network, when a data service limit expires by performing a limit management based on charge data of a data limit service subscriber, The MME unit transfers the changed rate information to the PDN GW through the SGW, blocks the call connection according to the data service limit expiration rule in the PDN GW, or reconnects the call connection to the data usage charging site do. According to the present invention, when the limit of the data service subscriber is expired in the LTE / EPC network, a call to the PDN-GW unit and the OCS interlock are prevented. Based on the changed plan information, the data limit It is possible to prevent unnecessary consumption of the network resources by controlling the data limit call by deleting the data call and the new call which are being reconnected to the charging site of the expired subscriber and controlling the data access.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packet data network gateway apparatus for a data limit service method and system in a mobile communication system and a packet data network gateway apparatus for a data limit service,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication service, and more particularly, to a mobile communication service in which when a data limit subscriber reaches a data service limit in an LTE (Long Term Evolution) / EPC (Evolved Packet Core) network including an EUTRAN (Evolved Universal Terrestrial Radio Access Network) A data limit service method and system in a mobile communication system suitable for performing a data service cutoff for a corresponding subscriber, and a packet data network gateway apparatus for a data limit service.

A 3rd Generation Partnership Project (3GPP) mobile communication system based on WCDMA (Wideband Code Division Multiple Access) radio access technology is widely deployed all over the world. HSDPA (High Speed Downlink Packet Access), which can be defined as the first evolutionary phase of WCDMA, provides 3GPP mobile communication system with highly competitive wireless access technology in the mid-term future.

However, as the requirements and expectations of users and operators continue to increase and competition for developing wireless access technologies continues, there is a need to evolve new technologies in 3GPP mobile communication systems in order to gain competitiveness in the future. Reduced cost per bit, increased service availability, the use of flexible frequency bands, simple structure and open interfaces, and proper power consumption of terminals are becoming a requirement. In addition, prevention of unnecessary latency at the network node and efficient use of network resources can also promote the technology evolution in 3GPP.

In 3GPP Release 8, a network architecture called EPC is described as one of mobile communication systems for meeting the above-mentioned requirements. EPC is a set of network nodes for 3GPP LTE (Long Term Evolution) system. The EPC supports the Evolved UMTS Terrestrial Radio Access Network (EUTRAN), which is an evolved RAN, by evolving the core network of the existing 3GPP system architecture. In addition, in order to increase the efficiency of the packet network, The network structure is simplified. A wireless communication system including EPC and EUTRAN is called an evolved packet system (EPS).

The EPC network is divided into three logical entities such as Packet Data Network Gateway (PDNGW), Serving GW (SGW), and Mobility Management Entity (MME).

First, in the user plane, the PDN GW is a gateway to an external network and a global mobility anchor for mobility between 3GPP access technology and non-3GPP access technology (CDMA2000, WiMAX or WIFI) And maintains SGW and external network and routing information for session control and packet as user plane, which are interworked with external Internet network and non-3GPP network, and performs tunneling and IP routing functions .

Next, as another user plane entity, the SGW is a mobility anchor for mobility between 3GPP access (E-UTRAN, UTRAN, GERAN). SGW interworks with eNodeB and S1-U interface as a session control and user plane node that handles payload traffic according to a set session and supports Inter LTE / 3GPP handoff.

Next, the MME is a control plane entity responsible for mobility management of UEs moving between different EUTRAN eNodeBs and also for session management.

Meanwhile, in the conventional 3GPP standard mobile communication network, the data limit service subscriber controls the corresponding session in the OCS (Online Charging Server) that provides the limit service based on the real-time charging information. Therefore, when the OCS detects that the limit has expired, The PDNGW transmits the corresponding session, and the PDNGW terminates the call.

Korean Patent No. 10-0447336, Aug. 26, 2004

As described above, when the subscriber using the data limit service in the LTE network is used to expire the data limit, since the call is opened to the PDNGW and the call is deleted by querying the OCS, unnecessary resource consumption is additionally incurred. There is a problem that more network resources are consumed because the session must be continuously managed.

The embodiments of the present invention provide a data limit service method and system in a mobile communication system capable of blocking a data call in a PDN GW terminal when a data limit service subscriber expires a limit in using the data service in the LTE / EPC network, It is possible to provide a packet data network gateway apparatus for a service.

In an embodiment of the present invention, when the data service limit expires by performing the limit management based on the billing data of the data limit service subscriber in the LTE / EPC network, after changing the plan information of the subscriber, A data limit service method in a mobile communication system capable of transferring a call connection from the MME to the PDNGW through the SGW, blocking a call connection according to a data service limit expiration rule in the PDNGW, or reconnecting a call connection to a data usage charging site; System, and a packet data network gateway device for data limit service.

The method of the embodiment of the present invention is characterized in that when a terminal of the data limit service subscriber in the packet data network gateway device (PDNGW) reaches or exceeds a data usage limit during data service through the mobile communication system, Receiving the changed rate information of the terminal device from the subscriber server (HLR / HSS); comparing the call connection status of the terminal device with the changed rate information of the terminal device according to a predetermined data service limit expiration rule; And performing connection control.

The process of performing the call connection control is a case where a call of the terminal device is connected or a new call connection is requested and when the predetermined data service limit expiration rule is set to a method of determining whether a call is opened per IP band, The method comprising the steps of: confirming whether or not to connect in the IP band; providing a free data service in the case of connection in the free-allowed IP band; . ≪ / RTI >

The step of performing the call connection control is a case where a call of the terminal device is connected or a new call connection is requested and when a predetermined data service limit expiration rule is set to a charge site connection method, The call connection according to the request can be reconnected to the data charging site that charges the data usage.

The step of receiving the changed rate information includes generating billing data based on the data usage amount of the terminal device in the packet data network gateway device (PDNGW), accumulating the billing data in the billing unit, And transmits the changed rate information to the subscriber server. In the subscriber server, the changed rate information is transmitted to the mobile communication switching center (MME) And the serving gateway device SGW.

An exemplary embodiment of the present invention provides a packet data network gateway apparatus in which a subscriber server (HLR / UDP) when a subscriber's terminal (UE) of a data subscription service subscriber reaches or exceeds a data usage limit while performing a data service through a mobile communication system, HSS) of the terminal device; a receiving unit for receiving the changed rate information of the terminal device; and a predetermined data service limit expiration rule when the terminal device is in call connection or performs a new call connection based on the received changed rate information, A message generator for generating a call deletion request message under the control of the service processor, and a transmitter for transmitting the generated call deletion request message to the mobile communication switching center (MME) .

The service processing unit is a case where a call of the terminal device is connected or a new call connection is requested. When the predetermined data service limit expiration rule is set to a method of determining whether to open a call for each IP band, And provides a free data service when the connection is in the free-allowed IP band, and can block the call connection when the connection is not in the free-allowed IP band.

The service processing unit is a case where a call of the terminal device is connected or a new call connection is requested. When the predetermined data service limit expiration rule is set to the charging site connection method, Can be reconnected to the data charging site that charges the data usage.

The reception unit generates billing data based on the data usage amount of the terminal device in the packet data network gateway device (PDNGW), accumulates the billing data in the billing unit, and transmits a limit exceeding message to the subscriber (MME) and the serving gateway device (SGW), and transmits the changed rate information to the subscriber server, and transmits the changed rate information to the mobile communication switching center (MME) and the serving gateway device ).

A data limit service system according to an embodiment of the present invention includes a packet data network gateway device (PDNGW) for generating at least one billing data based on a data service usage amount of a terminal device (UE) of a data limit service subscriber, (BS) for performing a limit management on the basis of a data usage amount and generating a limit exceeding message when a data usage amount reaches or exceeds a limit of data usage amount; and, when receiving the limit excess message from the billing unit, And a subscriber server (HLR / HSS) for delivering the changed rate information to the packet data network gateway device through a mobile communication switching center (MME) and a serving gateway (SGW) The packet data network gateway apparatus transmits the changed plan information It is possible to perform call connection control according to a predetermined data service limit expiration rule as to whether or not call connection of the terminal apparatus is established.

If the predetermined data service limit expiration rule is set to a method of determining whether to open a call for each IP band, the packet data network gateway device may transmit a free IP bandwidth And provides a free data service if the connection is in the free-allowed IP band, and can block the call connection when the connection is not in the free-allowed IP band.

The packet data network gateway device is in a case where a call of the terminal device is connected or a new call connection is requested. When the predetermined data service limit expiration rule is set to the charging site connection method, Can be reconnected to a data charging site that charges data usage.

In the present invention, effects obtained by representative ones of the disclosed inventions will be briefly described as follows.

The present invention prevents establishment of a call to the PDN-GW unit and interworking of OCS when the limit of the data limit service subscriber expires in the LTE / EPC network, and expires the data limit according to the data service limit expiration rule in the PDN GW unit based on the changed plan information. There is an effect that unnecessary consumption of network resources can be prevented by performing call connection control of the subscriber and reconnection to the data usage charge site.

1 is a block diagram for explaining a data limit service system in a mobile communication system according to an embodiment of the present invention;
2 is a flowchart illustrating a data limit service control procedure in a mobile communication system according to an embodiment of the present invention;
3 is a schematic block diagram of a packet data network gateway apparatus for data limit service according to an embodiment of the present invention;
4 is a flowchart illustrating an operation procedure of a packet data network gateway apparatus for data limit service according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like numbers refer to like elements throughout.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions in the embodiments of the present invention, which may vary depending on the intention of the user, the intention or the custom of the operator. Therefore, the definition should be based on the contents throughout this specification.

The embodiment of the present invention performs limit management based on charging data of a data limit service subscriber in the LTE / EPC network, and when the data service limit expires, changes the plan information of the corresponding subscriber, To the PDNGW through the SGW, to block the call connection according to the data service limit expiration rule in the PDNGW, or to reconnect the call connection to the data usage charging site.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram for explaining a data limit service system in a mobile communication system according to an embodiment of the present invention.

1, a UE 100, an eNode B 102, an MME 106, a Serving Gateway (SGW) 110, a Packet Data Network Gateway (PDNGW) (NB) 104, a SGSN (Serving GPRS) Support Node 108, an OFCS (Offline Charging System) 118, an OCS (Online Charging System) 116, A Policy & Charging Rule Function (PCRF) 114, a Home Location Register (HLR) / Home Subscriber Server (HSS) 10, a Packet Data Network (PDN) 1, a billing system 120 ), A subscriber information DB 122, and the like.

As shown in FIG. 1, the UE 100 is a subscriber terminal device. The UE 100 is a group of multimedia terminal devices for providing a data service or a data limit service with a predetermined limit to a subscriber according to an embodiment of the present invention. device group may include various types of terminal devices such as a smart phone, a notepad, a tablet computer, and the like.

The UE 100 may provide a broadband communication service to a subscriber by interfacing with a broadband connection through an eNB 102 or an NB 104, which will be described later, and may provide a broadband communication service to a subscriber through a communication supporting 3G, A broadband communication service including both a communication environment such as LTE / EPC or mobile WIMAX (Mobile World Interoperability for Microwave Access) and an IP (Internet Protocol) based communication environment such as the Internet can be provided.

The PDN 1 may include, for example, the Internet as a packet data network. Herein, the Internet is an Internet protocol (IP) protocol, and various services existing in the upper layer of the TCP / IP protocol, such as HTTP (HyperText Transfer Protocol), Telnet, FTP, DNS, , Simple Network Management Protocol (SNMP), Network File Service (NFS), and Network Information Service (NIS).

The HLR / HSS 10 can be collectively referred to as a subscriber server as a home location register and a home subscriber server, and is a network node including a database including subscriber information on a wireless communication system, Location-related data, charge plan information, and the like.

The eNB 102 is an EUTRAN access type base station equipment and can perform functions such as RF transmission and transmission and reception, signal strength and quality measurement, baseband signal processing, and channel card resource management.

The NB 104 is a base station equipment of the UTRAN access method and can perform functions such as RF transmission and transmission and reception, signal strength and quality measurement, baseband signal processing, and channel card resource management.

The MME 106 is an EUTRAN access type mobile communication switching center for signal control between the eNB 102 and a SGW 110 to be described later and determines where to route the data received from the UE 100 And is responsible for subscriber information and mobility management, session management, idle subscriber management, paging, and subscriber authentication functions of the UE 100.

The MME 106 can receive the changed plan information from the HLR / HSS 10 when the plan information for the UE 100 subscribed to the subscriber limit service is changed, and the changed plan information is transmitted to the PDNGW (112).

The SGSN 108 is a UTRAN-access mobile switching center that determines where to route the incoming data from the UE 100 and controls the mobility management of the subscriber information and the UE 100, session management, Paging, and subscriber authentication functions.

The SGW 110 is a serving gateway device that manages the mobility of the UE 100 between the eNB 102 and the second eNB, the 3GPP network, and the EUTRAN. The SGW 110 manages the mobility of the UE 100 between the eNB 102 and the second eNB, Control functions can be performed. In addition, the SGW 110 interworks with the eNB 102, supports handover between LTE / 3GPP, sets up an EPS bearer with the PDN GW 112, and uses packet data (PDU) Unit and transmits the changed rate information transmitted from the MME 106 to the PDN GW 112. [

The PDN GW 112 is a packet data network gateway apparatus for allocating IP of the UE 100 and controlling the session in cooperation with the PDN 1 and the Non-3GPP network. The PDN GW 112 is connected to the SGW 110 and the PDN 1 Maintain routing information, and perform tunneling and IP routing functions. In addition, the PDN GW 112 may be responsible for delivering the PDU to the SGW 110 and the PDN 1.

The PDN GW 112 can generate a call data record (CDR) of the UE 100 subscribed to the data limit service. In this case, the billing data can be generated for each predetermined data unit such as a packet, an MB, or a data service use time zone, and the generated billing data can be transmitted to the billing unit 120.

In addition, the PDN GW 112 may receive the changed rate information from the SGW 110. Here, the changed rate information is a change in the rate plan because the UE 100 that has subscribed to the data limit service reaches or exceeds the data usage limit. The PDN GW 112 may block the call according to the data service limit expiration rule or redirect the call connection to the data usage charge site depending on whether the UE 100 is connected to the call.

The OCS 116 is an on-line billing processing device, and can receive a billing information of a subscriber requiring real-time billing information, and can provide a credit management function such as a limit service.

The OFCS 118 is a billing processing device that collects the billing information generated by the PDN GW 112 and processes it as billing data requested by the billing unit 120 and transmits the billing data. The OFCS 118 may accommodate various charging protocols such as Radius, Diameter, and GTPP to provide a unified billing (BS) interface.

The PCRF 114 is a charging policy rule processing apparatus capable of performing communication policies and charging processing in a communication network by providing dynamic QoS and charging rules according to a service data flow .

The billing unit 120 may accumulate data for each subscriber UE subscribed to the data limit service based on the billing data received from the PDN GW 112 and determine whether the accumulated data reaches or exceeds the usage limit . If a certain subscriber UE has reached or exceeded the usage limit, it may transmit a limit exceeding message to the subscriber information DB 122.

On the other hand, the billing unit 120 may not transmit the limit exceeding message to the subscriber information DB 112 only when the limit is reached or exceeded. That is, when the data usage exceeds the data usage amount in a preset unit (for example, 50 MB of the usage amount or the remaining data service amount, 10 MB unit, etc.), a limit exceeding message may be generated to inform the information.

For example, when the data limit service subscriber subscribes to a limit of 500 MB, and when the data usage exceeds 450 MB, the limit information message (including 450 MB in use or 50 MB usage remaining information) is transmitted from the billing unit 120 to the PDNGW 112).

The PDN GW 112 transmits a limit information message to the UE 100 so that the subscriber of the UE 100 can check the data usage until now.

The subscriber information DB 122 can receive the limit exceeding message due to the data usage amount of any one subscriber UE from the billing unit 120. In this case, Change and change plan information to the HLR / HSS 10.

2 is a flowchart illustrating a data limit service control procedure in a mobile communication system according to an embodiment of the present invention.

Referring to FIG. 2, in step 200, the MME 106 allocates an IP to a terminal device through setting up an EPS bearer or an IP tunnel with the SGW 110 and the PDN GW 112, .

When the terminal device subscribed to the data limit service performs data service in step 202, the PDN GW 112 generates billing data (CDR) for each predetermined data unit (e.g., packet, MB, etc.) or time zone , And transmits the generated charging data to the billing unit 120.

In step 204, the charging unit 120 accumulates data based on the charging data received from the PDN GW 112, and determines whether the accumulated data reaches or exceeds the usage amount limit.

If the usage limit is reached or exceeded, the overflow message is transmitted to the subscriber information DB 112 in step 206. However, if the terminal device has not reached the pre-established data limit, the process proceeds to step 208 and continuously monitors whether or not the limit is reached.

If the subscriber information DB 112 receives the excess message from the billing unit 120 in step 112, the subscriber information DB 112 changes the subscriber's rate plan A to a billing plan A ' (10). In step 212, the HLR 10 applies the changed tariff to the subscriber, delivers the changed tariff to the MME 106, and the MME 106 transmits the changed tariff information to the PDN GW 112 via the SGW 110 .

The PDN GW 112 determines whether to process the data limit expiration subscriber based on the changed rate information received from the HLR 10 through the MME 106 and the SGW 110 in step 214. The PDN GW 112 performs predetermined data It is processed in accordance with the usage limit expiration rule.

The call processing decision method for the data limit expiration subscriber in the PDN GW 112 will be described in detail with reference to FIG. 3 to FIG.

3 is a schematic block diagram of a packet data network gateway apparatus for data limit service according to an embodiment of the present invention.

3, the PDN GW 112, which is a packet data network gateway device, may include a service processing unit 300, a receiving unit 302, a message generating unit 304, a rule DB 306, a transmitting unit 308, have.

More specifically, the receiving unit 302 can receive the changed rate information of the subscriber whose data service limit has expired via the MME 106 and the SGW 110 from the HLR / HSS 10, which is the subscriber server, To the service processing unit 300.

The service processing unit 300 can control the call connection according to the data usage limit expiration rule when the subscriber UE 100 whose data service limit has expired is currently accessing the data call or when the call connection is attempted.

Here, the data usage limit expiration rule is at least one rule preset through the mobile communication system, and the processing of the data service limit expiration subscriber (e.g., allowing or blocking a call connection, etc.) through rules set for each situation, Can be performed.

For example, the data usage limit expiration rule can be expressed as shown in Table 1 below.

Local Rule What you will do #One Allow free opening of free IP band
Perform blocking for calls other than l #2 Reconnect all call connections to the data usage charge site

That is, as shown in Table 1, when the data usage limit expiration rule is set to # 1 (for example, a method for determining whether to open a call for each IP band), a subscriber UE whose data service usage limit has expired, If requested, the IP address of the UE requesting call connection can be confirmed.

If the UE performs a call connection in the free allowed IP band, the subscriber can receive the free data service by opening the call, but the call connection can be blocked for the call connection through the other IP.

In addition, when the data usage limit expiration rule is set to # 2 (for example, a charging site connection method), when the subscriber UE whose data service usage limit has expired requests the call connection, the data usage charge is guided, The service provider can provide a service for automatically linking to a usage charge site for service.

The data usage limit expiration rule can be set at the request of the subscriber UE or can be preset in the mobile communication system for each situation, time slot, and subscriber.

The message generating unit 304 may generate a bearer setup request and an IP allocation request message to be transmitted to the SGW 110 under the control of the service processing unit 300. The MME 106 may generate a bearer setup request and an IP allocation request message, A deletion request message for the request can be generated.

The rule DB 306 may store at least one data usage limit expiration rule that has been set. When the service processing unit 300 receiving the changed plan information from the HLR / HSS 10 requests the storage, May be temporarily stored for a predetermined time or procedure.

The transmitting unit 308 transmits a message generated through the message generating unit 304 to the MME 106, and can transmit a message such as a bearer setup request, an IP allocation request, and a call deletion request.

4 is a flowchart illustrating an operation procedure of a packet data network gateway apparatus for a data limit service according to an embodiment of the present invention.

Referring to FIG. 4, in step 400, the PDN GW 112, which is a packet data network gateway device, transmits the changed plan information due to the data limit of the subscriber UE 100 subscribed to the data limit service from the HLR 10 to the MME 106 and the SGW 110. [

In step 402, the subscriber UE 100 determines whether the current data call is in progress or requests to open a new call. If a data call is in progress or a request for opening a new call is made, the flow advances to step 404 to check a predetermined data usage limit expiration rule.

If the data usage limit expiration rule is set to "# 1 " in step 406, the call connection control is performed based on the execution details corresponding to the data usage limit expiration rule" # 1 " stored in the rule DB 306 do.

For example, if the data usage limit expiration rule "# 1" is set as a rule that "blocking a call connection other than a call connection request for a free allowed IP band" And disconnects the connection if the connection is not in the corresponding IP band.

On the other hand, if the data usage limit expiration rule is "# 2" in step 406, the process proceeds to step 410 to check the contents of the data usage limit expiration rule "# 2 & The call connection control is performed based on the execution contents of the call connection control.

For example, if the data usage limit expiration rule "# 2" is set as a rule to "reconnect all calls to the charging site ", the call connection according to the call connection request or the call connection request is charged Lt; RTI ID = 0.0 > recharging < / RTI >

As described above, in the embodiment of the present invention, when the data service limit expires by performing the limit management based on the charging data of the data limit service subscriber in the LTE / EPC network, after changing the plan information of the subscriber, The plan information is transmitted from the MME to the PDNGW through the SGW, the call connection is blocked according to the data service limit expiration rule in the PDNGW, or the call connection is reconnected to the data usage charge site.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the scope of the appended claims, and equivalents thereof.

As described above, in the mobile communication system according to the present invention, the packet data network gateway apparatus for the data limit service method and system and the data limit service is provided to the PDN-GW terminal when the limit of the data limit service subscriber in the LTE / Call connection and OCS interworking, and based on the changed plan information, control of call connection and data usage of data expiration expiration subscriber according to data service limit expiration rule in PDNGW unit. It is suitable for preventing unnecessary consumption of network resources in controlling the data limit service in the LTE / EPC network by controlling the data limit call through deletion.

10: HLR or HSS 100: UE 106: MME
110: SGW 112: PDNGW 120:
122: Subscriber information DB

Claims (11)

A method for providing a data limit service performed by a packet data network gateway device (PDNGW)
When a data usage amount of a UE to which a first rate plan having a predetermined limit of a subscriber subscribed to the data limit service reaches the limit or exceeds the limit, Receiving from the subscriber server (HLR / HSS) information on a second rate plan that restricts data service for the device,
And controlling the call connection from the terminal to be limited based on the second rate information
Data limit service method.
The method according to claim 1,
Wherein the controlling step comprises:
If the connection is allowed in a free allowed IP band free of call connection, and if the call connection is not a connection in the free allowed IP band,
Data limit service method.
The method according to claim 1,
Wherein the controlling step comprises:
Reconnecting the call connection to a data charging site that charges data usage
Data limit service method. The method according to claim 1,
The call connection, which is restricted in the control process,
A call being already being connected to the terminal apparatus or a new call of the terminal apparatus
Data limit service method. When a data usage amount of a UE to which a first rate with a predetermined limit of a subscriber subscribed to a data limit service reaches or exceeds the limit is used, A subscriber server (HLR / HSS) for receiving information on a second rate plan for restricting data service for the subscriber server;
And a service processor for controlling the call connection from the terminal device to be limited based on the second rate information
Packet data network gateway device. 6. The method of claim 5,
The service processing unit,
If the call connection is in a free allowable IP band allowed free of charge, and if the call connection is not a connection in the free allowed IP band,
Packet data network gateway device. 6. The method of claim 5,
The service processing unit,
Reconnecting the call connection to a data charging site that charges data usage
Packet data network gateway device. 6. The method of claim 5,
The call connection limited by the service processing unit,
A call being already being connected to the terminal apparatus or a new call of the terminal apparatus
Packet data network gateway device. A packet data network gateway device (PDNGW) for generating at least one billing data based on a data usage amount of a terminal device (UE) to which a first rate plan having a predetermined limit of a subscriber subscribed to the data limit service is applied,
A billing unit (BS) for determining whether the data usage amount of the terminal device reaches or exceeds the limit based on the billing data;
And a subscriber information DB for changing, when the data usage amount of the terminal apparatus reaches the limit or exceeds the limit, to a second plan that restricts a data service for the terminal apparatus, which is different from the first plan,
The packet data network gateway apparatus comprising:
And controls the call connection from the terminal device to be limited based on the changed second rate information
Data limit service system.
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