KR100617780B1 - Method for updating routing area of mobile node in wireless internet and mobile communication network - Google Patents

Abstract

The present invention is to control the access of the packet data service by the mobile terminal in the mobile communication network connected to the data packet network through a plurality of gateway nodes, the mobile terminal to update the routing area to the service node of the mobile communication network If requested, the service node selects an appropriate first gateway node for the mobile terminal, confirms that the first gateway node is not a second gateway node previously connected to the mobile terminal, and informs the first gateway node. Request to generate subscriber data for the mobile terminal. The first gateway node generates subscriber data for the mobile terminal and requests the mobile terminal to perform a registration procedure so that the home agent registers the identifier of the mobile terminal corresponding to the address of the first gateway node. . In the present invention, when the GGSN (FA) is changed due to the movement of the mobile terminal in the UMTS network, the modified GGSN (FA) information can be registered in the HA, thereby optimizing the UMTS network path delivered to the terminal.

GPRS, UMTS, SGSN, GGSN, RA UPDATE, PDP CONTEXT, FA, HA

Description

METHOD FOR UPDATING ROUTING AREA OF MOBILE NODE IN WIRELESS INTERNET AND MOBILE COMMUNICATION NETWORK}             

1 is a diagram schematically showing the structure of a UMTS network according to a preferred embodiment of the present invention.

2 is a diagram illustrating a radio access network (UTRAN) of a UMTS system.

3 is a block diagram of a wireless packet data communication network including a UMTS core network.

4 is a message flow diagram illustrating a PDP context activation procedure.

5 is a message flow diagram illustrating a typical inter-SGN RA update procedure.

6 is a message flow diagram illustrating an RA update procedure between SGSNs according to a preferred embodiment of the present invention.

The present invention relates to a mobile internet service method in a wireless communication system, and more particularly, to a method and a network for providing a stable mobile internet service while ensuring mobility of a mobile terminal.

As is known, subscribers present on a wireless communication network, such as Cellular or Personal Communications Services or International Mobile Telecommunication (IMT-2000) communication systems, may be connected via an Internet capable mobile terminal or a laptop computer or the like. You can access the Internet in any environment by connecting to your existing mobile phone using a software / hardware modem.

In a digital mobile telephone network, a mobile communication network such as a European type Global System for Mobile communications (GSM) system can be divided into two parts. The first part is called a radio network composed of base stations (BSs) and base station controllers (BSCs) that control a plurality of base stations, respectively. The second part is called Core Network and consists of Mobile Switching Centers (MSCs) each responsible for a plurality of base station controllers. The mobile exchange is the same as the exchange of a typical telephone network. Internet traffic is carried by a Circuit Switched Connection established between the mobile terminal and the Internet service provider through the core network.

The ongoing mobile communication standard, in particular the General Packet Radio Service (GPRS) communication system, developed from GSM, was developed to support packet switched services with GSM. The advent of GPRS has made it possible to efficiently add additional core networks to GSM systems. The GPRS core network is serviced by Serving GPRS Support Nodes (SGSNs) and Gateway GPRS Support Nodes (GGSNs).

Universal Mobile Telecommunications System (UMTS) is a third generation communication system developed to be combined with GPRS or similar packet switching systems. The UMTS communication system supports not only voice services but also packet data services that are faster than GPRS, enabling high-speed data communications and video communications. In a UMTS communication system, a wireless network is commonly referred to as a UMTS Radio Access Network (UTRAN) or simply a RAN, and the RAN is a Radio Network Controller corresponding to Node Bs corresponding to base stations and base station controllers. Controllers: RNCs.

Typically, Internet access through a UMTS system is through a Packet Switched Core Network. The mobile terminal wishing to access the Internet requests Internet access to the GGSN through the Node B and the radio network controller. GGSN forwards the request to the Internet access server via the Internet. In general, an Internet access server is an Internet service provider that operates independently of a mobile communication network. In some cases, however, the Internet access server acts as a component of the mobile communication network as needed, such as assigning an Internet Protocol (IP) address to the mobile terminal.

According to Internet Protocol Version 4 (IPv4), the IP address consists of 32 bits. More advanced Internet Protocol Version 6 (IPv6) proposes a 128-bit IP address consisting of a 64-bit routing prefix that uniquely identifies an Internet access server and also a 64-bit host prefix that uniquely identifies a mobile terminal. These IP addresses can be dynamically or statically assigned to mobile terminals accessing the Internet. The assigned IP address is returned to the mobile terminal via a packet switched core network and wireless network through which the mobile terminal can initiate an internet session.

If the mobile terminal is registered with the home network when requesting internet access, the internet session is routed through the GGSN of the home network. However, if the mobile terminal is roaming and registered with the Foreign Network, the Internet session is handled through the SGSN of the visiting network and possibly the GGSN of the home or visiting network.

In a network supporting the Internet service, the GGSN may include a function as a foreign agent (FA) that locates and registers mobile terminals in a corresponding wireless service area and registers it with a higher system. Information related to the location and communication of the mobile terminals registered through the home agent (HA) is integrally managed.

The 3rd Generation Partnership Project (3GPP) group, which standardizes the UMTS communication system, provides mobile Internet services in the UMTS network when there is only one GGSN serving as a FA in the UMTS network and as a FA in the UMTS network. The operation for the case where several GGSNs exist is presented respectively.

In particular, when there are several GGSNs in the above two cases, when the mobile station moves from a subregion of one GGSN to a subregion of another GGSN, control switching should be performed between the old GGSN and the new GGSN. However, the conventional Internet service method through the UMTS communication system does not provide a function for normally registering the changed location information of the mobile terminal in the core network when the mobile terminal moves between the GGSNs. Therefore, there is a problem that it was not possible to provide a stable Internet service while ensuring the mobility of the mobile terminal.

Accordingly, an object of the present invention, which was devised to solve the problems of the prior art operating as described above, is to provide a stable internet service method and network for guaranteeing mobility of a mobile terminal receiving a mobile internet service in a UMTS network. .

Another object of the present invention is to provide a method and network for supporting a mobile Internet service most optimized by selecting a GGSN having the nearest FA function when a mobile terminal performs an inter-SGS RA update procedure.

In order to achieve the above object, an embodiment of the present invention provides a method of controlling access of a packet data service by a mobile terminal in a mobile communication network connected to a data packet network through a plurality of gateway nodes.

Requesting an update of a routing area from a mobile terminal to a service node of the mobile communication network;

Selecting, by the service node, a first gateway node suitable for the mobile terminal, and confirming that the first gateway node is not a second gateway node previously connected to the mobile terminal;

The service node requesting the first gateway node to generate subscriber data for the mobile terminal;

And generating, by the first gateway node, subscriber data for the mobile terminal.

Another embodiment of the present invention is a mobile communication network,

A plurality of gateway nodes connecting the mobile communication network to a data packet network;

Serving a mobile terminal, selecting a first gateway node suitable for the mobile terminal from among the plurality of gateway nodes in response to a routing area update request of the mobile terminal, and the first gateway node is previously connected to the mobile terminal. If not the second gateway is characterized in that it comprises a service node for requesting the first gateway node to generate subscriber data for the mobile terminal.

Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention. In the following description of the present invention, detailed descriptions of well-known functions or configurations will be omitted if it is determined that the detailed description of the present invention may unnecessarily obscure the subject matter of the present invention. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

The present invention, which will be described later, selects the nearest GGSN / FA so that an optimal mobile internet service can be achieved when a mobile station performs a routing area (RA) update procedure between SGSNs in a UMTS network.

1 schematically illustrates the structure of a UMTS network according to a preferred embodiment of the present invention.

Referring to FIG. 1, a mobile station (MS) 10 is connected to a UMTS Terrestrial Radio Access Network (UTRAN) 20 to process voice and data calls, and to connect a circuit service (CS) with a circuit service. Supports Packet Service (PS). The UTRAN 20 is composed of a base station (Node B) and a radio network controller (RNC), the detailed configuration of which is shown in FIG. The base station is connected to the mobile terminal 10 through a Uu interface, and the radio network controller is connected to the core network 30 through an Iu interface. The core network 30 collectively refers to the SGSN 32 and the GGSN 34.

The UTRAN 20 may refer to wireless data or control messages transmitted from the mobile terminal 10 on the air by using a GPRS Tunneling Protocol (GTP). Perform protocol conversion according to GPRS is a packet data service performed in a UMTS network.

The SGSN 32 is a service node that manages subscriber information and location information of the mobile terminal 10. The SGSN 32 is connected to the UTRAN 20 through an Iu interface and is connected to a GGSN 34 through a Gn interface. Send and receive control messages. The SGSN 32 is connected to a Home Location Register (HLR) 36 through a Gr interface to register subscriber information and location information.

The home location register 36 stores subscriber information and routing information of a packet domain, and is connected to the GGSN 34 through a Gc interface. The home location register 36 is located in another public land mobile network (hereinafter referred to as "PLMN") (not shown) in consideration of roaming of the mobile terminal 10, and the like. You may.

The GGSN 34 is an access point corresponding to an end of a GTP in a UMTS network. The GGSN 34 is connected to an external network through a Gi interface and is connected to the Internet 40 or a packet domain network (PDN) or another. It can be linked with PLMN.

FIG. 2 is a block diagram illustrating a UMTS Terrestrial Radio Access Network (hereinafter referred to as UTRAN) of a UMTS system.

Referring to FIG. 2, the UTRAN 20 is composed of radio network controllers (RNCs) 34a and 34b and node Bs 26a, 28a, 26b and 28b. 30). There may be a plurality of cells below the node Bs 26a, 28a, 26b, 28b, and each of the radio network controllers 24a, 24b has a corresponding lower node Bs 26a, 28a, 26b, 28b. Each node B (26a, 28a, 26b, 28b) controls the corresponding lower cells. One RNC and Node Bs and cells controlled by the RNC are collectively referred to as a Radio Network Subsystem (hereinafter referred to as RNS) 22a and 22b.

The RNC 34a, 34b allocates or manages radio resources of the Node Bs 26a, 28a, 26b, 28b that it controls. Node Bs 26a, 28a, 26b, and 28b serve to provide actual radio resources. Radio resources are configured for each cell, and the radio resources provided by the Node Bs 26a, 28a, 26b, and 28b refer to radio resources of cells managed by each node. The terminal 10 may configure a radio channel and perform communication using radio resources provided by a specific cell of a specific Node B.

3 illustrates a configuration of a wireless packet data communication network including a UMTS core network. Here, a system implementation based on GSM / GPRS based technology is illustrated.

Referring to FIG. 3, each SGSN 32a, 32b obtains subscriber information from the corresponding HLRs 36a, 36a and receives packet data of the mobile terminal 10 existing in the service area of the lower UTRAN 20a, 20b. Control the service. The mobile terminal 10 located in a cell communicates with the base station through an air interface, and also communicates with the SGSN 32a of the service area to which the cell belongs. In such a communication network, packet switched transmission of data packets is performed between the mobile terminal 10 and the SGSN 32a.

The GGSN backbone 50 connects UMTS core networks terminated by SGSNs 32a and 32b to the Internet 40a, service center 40b or private network 40c by GGSNs 34a, 34b and 34c. To external systems such as The GGSN backbone 50 is also connected to an Inter-GPRS Backbone Network 54 by a Border Gateway (BG) 52.

GGSNs 34a, 34b, 34c store Packet Data Protocol (PDP) addresses and routing information, ie SGSN addresses, of packet data service subscribers. The routing information is used to tunnel data traffic from the Internet 40a to the terminal's current switching point, i.e., SGSN.

The HLRs 36a and 36b of the UMTS core network store subscriber identifiers and subscriber data and routing information mapped to pairs of PDP type and PDP address. HLRs 36a and 36b also map each of the PDP type / address pairs to one or more GGSNs.

To access the packet data service, the mobile terminal first establishes a logical link with the SGSN covering the area where it is located. In this case, the SGSN creates a mobility management (MM) context for the mobile terminal and performs an authentication and authorization procedure for the mobile terminal. The MM context includes the states of the mobile terminal such as idle, standby and ready and the location of the mobile terminal.

In order to transmit and receive traffic data, the mobile station is configured to activate a packet data address, i. This operation is performed between the mobile terminal and the corresponding GGSN, where interworking with an external system, i.e., the Internet, is initiated. In more detail, the PDP context is created in the mobile terminal, the GGSN, and the SGSN.

A mobile terminal in standby or ready state can have one or more PDP contexts. PDP contexts can include PDP types such as X.25 or IP, PDP addresses such as X.121 addresses, Quality of Service (QoS), Network Service Access Point Identifier (NSAPI), and additionally, access point names (Access). Define different data transmission parameters such as Point Name (APN).

Next, an operation of activating the PDP context to access the packet data service will be described with reference to FIG. 4. 4 is a message flow diagram illustrating a PDP context activation procedure. The PDP context activation procedure is performed after the GPRS attach procedure.

In order to transmit data traffic in the UMTS packet domain, a GTP tunnel must be created. When a GTP tunnel is created, there are two cases of mobile terminal initial activation (MS-Initiated Activate) that the mobile terminal requests to the UMTS core network and network request activated to request the UMTS core network from an external system. Separated by.

Referring to FIG. 4, the mobile terminal transmits an Activate PDP Context Request message to SGSN to generate a GTP tunnel for transmitting the packet data in response to the occurrence of packet data. (60) Parameters included in the PDP context activation request message include NSAPI, PDP type, PDP address, APN, and QOS.

The NSAPI is information generated by the mobile terminal, and a total of 11 values from 5 to 15 can be used. The NSAPI value is one-to-one correspondence with the PDP address and the PDP context identifier, and is assigned a value unique to each of the GTP tunnels to distinguish the GTP tunnels. The PDP address represents the IP address of the mobile terminal used in the UMTS domain and is information for distinguishing the PDP context information. PDP context stores various information of GTP tunnel and is managed by PDP context ID.

The PDP type indicates the type, that is, the type of GTP tunnel to be created through the PDP context activation request message. Types of the GTP tunnel include IP, Point to Point Protocol (PPP), Mobile IP, and the like. The APN indicates an access point of a service network that a mobile terminal requesting to create the GTP tunnel currently wants to access. The QOS represents the required quality of packet data transmitted over the GTP tunnel currently being created. Packet data using a high quality of service GTP tunnel is prioritized over packet data using a low quality of service GTP tunnel.

Upon receiving the PDP context activation request message, the SGSN transmits a radio access bearer setup message to a mobile terminal through UTRAN to set up a radio access bearer. (62) Thus, between SGSN and UTRAN and UTRAN. As a radio access bearer is established between a mobile station and a mobile terminal, resources required for packet data transmission over the air are allocated.

If tracing is enabled in UTRAN, SGSN sends an Invoke Trace message to UTRAN, along with trace information from the HLR or Operation and Maintenance Center (OMC). (64) The tracking function is used for tracking the flow of data.

Here, if the mobile terminal has requested the allocation of the dynamic address, the SGSN causes the GGSN to allocate the dynamic address. The GGSN may be indicated by an APN included in the PDP context activation request message. If there is no APN or if the APN does not indicate a valid GGSN address, the appropriate GGSN is selected by the SGSN.

With the radio access bearer set up through UTRAN, SGSN sends a Create PDP Context Request (GDP) message to GGSN. (66) A tunnel endpoint ID (TEID) is newly created between SGSN and GGSN. The TEID is set to transmit packet data between network nodes using a GTP tunnel. That is, SGSN stores the TEID of GGSN, and GGSN stores the TEID of SGSN. The PDP context creation request message includes a TEID to be used when the GGSN transmits packet data to the SGSN.

In response to the PDP context creation request message, the GGSN transmits a Create PDP Context Response message to the SGSN when the PDP context creation is normally completed (68). This creates a GTP tunnel between SGSN and GGSN, and enables actual packet data transmission through the GTP tunnel.

Upon receiving the PDP generation response message, the SGSN transmits an Activate PDP Context Accept message to the mobile terminal (70). As the mobile terminal receives the PDP activation permission message, a radio path is generated between the mobile terminal and the UTRAN, and the generation of the GTP tunnel is completed between the UTRAN, SGSN, and GGSN.

The mobile terminal can transmit and receive all packet data having its own PDP address through the GTP tunnel. The GTP tunnel has one-to-one correspondence with one PDP context. If the GTP tunnel is different, the GTP tunnel has different tunnel information because the PDP context is different.

In the UMTS network, a routing area (RA) update procedure is performed when the mobile station is idle. The RA update is a procedure of notifying the SGSN 115 of new location information when the mobile terminal moves between areas managed by a Radio Network Controller (RNC). The SGSN 115 then registers that information with the HLR 117.

RA renewal is divided into two categories according to the change of SGSN. That is, intra-SGSN RA update is performed when the mobile terminal moves between RNCs managed by one SGSN. In addition, Inter-SGSN RA update is performed when a mobile station moves between RNCs managed by different SGSNs. Through this RA update procedure, the new SGSN receives all terminal related information, that is, a MM (Mobility Management) context and a PDP context, from the existing SGSN.

5 is a message flow diagram illustrating a typical inter-SGN RA update procedure.

Referring to FIG. 5, when the mobile station enters a new routing area in step 102, the UE transmits a Routing Area Update Request message to the new SGSN. In step 104, the new SGSN determines the MM and PDP of the mobile terminal. In order to obtain the contexts, an SGSN Context Request message is sent to the existing SGSN. The SGSN context request message includes the address of the new SGSN. In step 106, the existing SGSN responds with an SGSN Context Response message. The SGSN context response message includes an MM context and a PDP context. If the existing SGSN cannot identify the mobile terminal, the existing SGSN responds with an appropriate error message.

Process 108 represents the execution of typical security functions. If ciphering is supported, an encryption mode is set in this process, and information related to encryption is obtained through HLR.

When the reception of all the contexts is completed, the new SGSN transmits an SGSN Context Acknowledge message to the existing SGSN in step 110. Here, the existing SGSN stores the address of the new SGSN until the existing MM data packets are removed so that the data packets can be delivered to the new SGSN. That is, the existing SGSN starts a timer and removes all contexts for the mobile terminal when the timer expires. In step 112, the existing SGSN delivers the data packets buffered to the new SGSN.

In step 114, the new SGSN transmits an Update PDP Context Request message to the corresponding GGSN. The PDP context update request message includes an address of the new SGSN, quality of service information, and the like. In step 116, the GGSN updates its own PDP context and returns a PDP context update response message. Here, GGSN includes the address of the new SGSN in its PDP context.

In step 118, the new SGSN sends an Update Location message to the HLR to notify that the SGSN of the mobile terminal has changed. Where HLR is typically the HLR of the domain to which the existing SGSN belongs. The location update message includes an address of the new SGSN and an identifier of the mobile terminal. The HLR then deletes the MM context by sending a Cancel Location message to the existing SGSN. The location removal message includes an identifier of the mobile terminal. That is, if the timer described in step 110 is not running, the existing SGSN removes the MM and PDP contexts, and responds with a Cancel Location Ack message in step 122. The location remove acknowledgment message also includes an identifier of the mobile terminal.

In step 124, the HLR sends an Insert Subscriber Data message to the new SGSN. The subscriber data insertion message includes both the identifier of the mobile terminal and the GPRS subscriber data. In step 126, the new SGSN responds with an Insert Subscriber Data Ack message that includes the identifier of the mobile terminal. In step 128, the HLR sends an Update Location Ack message including an identifier of the mobile terminal to the new SGSN in response to the location update message.

In step 130, the new SGSN transmits a Routing Area Update Accept message to the mobile terminal. Then, in step 132, the mobile terminal responds with a Routing Area Update Complete message. Thus, the routing area update procedure is completed, and when the mobile station attempts packet data service, the GTP tunnel between the new SGSN and the GGSN is used.

In step 134, the GGSN transmits a MIP FA advertisement message. This corresponds to the case where the GGSN performs the FA function. If the mobile terminal transmits a MIP Registration Request message in step 136, the GGSN transmits a MIP Registraion Request message to the corresponding HA in step 138.

In step 140, the HA registers the identifier of the mobile terminal corresponding to the address of the corresponding FA, that is, the address of the GGSN, and returns a MIP Registration Reply message to the GGSN. In step 142, the GGSN returns a MIP Registration Reply message to the mobile terminal to complete preparation for the mobile terminal to access the packet data service.

As described above, when the mobile terminal roams from one SGSN to another SGSN, the new SGSN requests the existing SGSN to the MM context and the PDP context. After the new SGSN has received all the information from the existing SGSN, it will notify the Gateway GPRS Support Node (GGSN) and HLR of the changed SGSN address. The existing SGSN deletes the MM context and the PDP context that it has saved after a certain time after handing over all information to the new SGSN.

As shown in FIG. 5, since the SGSN takes charge of mobility management when the mobile terminal moves, the change information of the GGSN is not registered in the location information of the mobile terminal. This is because APNs (Access Point Names) managed by GGSN are different. In this case, the APN indicates an access end point for a data session of the mobile terminal and is used to select a reference point to an external network.

In general, when there are several GGSNs in one UMTS network, each GGSN serves a different service. Since different service means providing different APN, different APN means that among these GGSNs, there are several GGSNs that provide APNs for mobile internet, that is, GGSNs with FA function.

If there are several GGSNs acting as FAs in the UMTS network, if the change information of the GGSN is not registered in the HA at the time of RA update, the FA is not made because the FA is not made and the HA is located in the area of the corresponding GGSN. May be assigned a route to another GGSN. In this case, the mobile internet service optimized for the mobile terminal cannot be guaranteed. Therefore, in the preferred embodiment of the present invention to be described later, when the mobile terminal performs an RA update procedure between SGSNs, the mobile station selects the GGSN having the nearest FA function.

According to a preferred embodiment of the present invention, when the new SGSN receives the MM context and the PDP context information from the existing SGSN, the new SGSN confirms that the APN of the corresponding mobile terminal is "Mobile IP v4". When the APN is requested, obtain its GGSN address information by contacting its APN cache information or DNS (Domain Name System) server. If there is no secured GGSN address or if the secured GGSN address is the same as the information received from the existing SGSN, the RAN renewal procedure between SGSNs as shown in FIG. 5 is performed. That is, the GGSN is not changed.

If the obtained GGSN address is different from the information received from the existing SGSN, the acquired GGSN should set the PDP context. When the GGSN gives a normal accept response, it deletes the PDP context information stored in the existing GGSN. At this time, the existing SGSN maintains the PDP context for a certain time and deletes the PDP context by itself.

Meanwhile, the new GGSN causes the mobile terminal to start a registration request procedure as in the case of setting up a PDP context for the first time. Then, since the changed FA address is registered in the HA, the packet transmitted to the mobile terminal is then delivered to the new GGSN, thereby enabling the optimized mobile Internet service.

6 is a message flow diagram illustrating an RA update procedure between SGSNs according to a preferred embodiment of the present invention.

Referring to FIG. 6, when the mobile station enters a new routing area in step 202, a routing area update request message is transmitted to the new SGSN. In step 204, the new SGSN determines the MM and PDP of the mobile terminal. In order to obtain the contexts, an SGSN Context Request message including the address of the new SGSN is transmitted to the existing SGSN. In step 206, the existing SGSN responds with an SGSN Context Response message including the MM context and the PDP context. If the existing SGSN cannot identify the mobile terminal, the existing SGSN responds with an appropriate error message.

Process 208 illustrates the execution of typical Security Functions. If ciphering is supported, an encryption mode is set in this process, and information related to encryption is obtained through HLR.

When the reception of all the contexts is complete, in step 210, the new SGSN transmits an SGSN Context Acknowledge message to the existing SGSN. Here, the existing SGSN stores the address of the new SGSN until the existing MM data packets are removed so that the data packets can be delivered to the new SGSN. That is, the existing SGSN starts a timer and removes all contexts for the mobile terminal when the timer expires. In step 212, the existing SGSN instantaneously delivers data packets received from the GGSN to the new SGSN.

The new SGSN refers to the MM and PDP contexts received from the existing SGSN in step 206, confirming that the APN of the mobile terminal is "MobileIPv4", and asks its own APN cache information or DNS server to determine the address of its GGSN. Secure. Herein, the APN requested by the mobile terminal is "MobileIPv4", which means that the mobile terminal requests the mobile Internet service.

If the obtained GGSN address is not the same as the GGSN address obtained from the existing SGSN, the mobile terminal is considered to be roaming between GGSNs. Send a Create (PDP Context Request) message, so that the new GGSN to set the PDP context for the mobile terminal. The new GGSN creates a new PDP context as in the PDP activation procedure shown in FIG. In step 216, the new SGSN receives a Create PDP Context Response message from the new GGSN.

In step 218, the new SGSN transmits a Delete PDP Context Request message to the existing GGSN. In step 220, the existing GGSN deletes the PDP context for the mobile terminal and returns a Delete PDP Context Response message to the new SGSN. Here, as shown in FIG. 4, the existing SGSN deletes the corresponding PDP context when its timer expires.

In step 222, the new SGSN notifies the HLR that the SGSN of the mobile terminal has been changed by sending an Update Location message including the address of the new SGSN and the identifier of the mobile terminal. Here, the new SGSN typically sends a location update message to the HLR of the UMTS network to which the existing SGSN belongs. Then, in step 224, the HLR deletes the MM context by sending a Cancel Location message including the identifier of the mobile station to the existing SGSN. That is, if the self timer described above is not running, the existing SGSN removes the MM and PDP contexts, and responds with a Cancel Location Ack message including the identifier of the mobile terminal in step 226.

In step 228, the HLR sends an Insert Subscriber Data message including both the identifier of the mobile terminal and the GPRS subscriber data to the new SGSN. In step 230 the new SGSN responds with an Insert Subscriber Data Ack message that includes the identifier of the mobile terminal. In step 232, the HLR sends an Update Location Ack message including the identifier of the mobile terminal to the new SGSN in response to the location update message.

In step 234, the new SGSN transmits a Routing Area Update Accept message to the mobile terminal. In step 236, the mobile terminal responds with a Routing Area Update Complete message. Thus, the routing area update procedure is completed, and when the mobile station attempts packet data service, the GTP tunnel between the new SGSN and the GGSN is used.

In step 238, the new GGSN transmits a MIP FA advertisement message as it is when receiving a request for setting up an APN call. This is the case where the new GGSN performs the FA function, so that the mobile terminal can start the registration request procedure.

If the mobile terminal transmits a MIP Registration Request message in step 240, the new GGSN transfers a MIP Registraion Request message to the corresponding HA in step 242. In step 244, the HA registers the identifier of the mobile terminal corresponding to the FA address, that is, the address of the new GGSN, and returns a MIP Registration Reply message to the new GGSN. In step 246, the new GGSN completes the preparation for the mobile terminal to access the packet data service by returning a MIP Registration Reply message to the mobile terminal.

As described above, when recognizing that the GGSN has been changed in the routing area update procedure, the new GGSN operates in the same manner as when the PDP context is first created. Therefore, the new GGSN sends a MIP FA notification message to the mobile terminal, causing the mobile terminal to start the registration request procedure.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

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

According to the present invention, when there are many GGSNs with FA functions in the UMTS network, when the SGSN is changed due to the movement of the mobile terminal, the PDP context of the mobile terminal is newly created in the new GGSN through the routing area update. By doing so, the changed FA information of the GGSN is registered in the HA. The present invention registers the changed GGSN / FA information to the HA when the GGSN / FA is changed due to the movement of the mobile terminal in the UMTS network to maintain the optimal path for the mobile Internet service in the UMTS network.

Claims (17)

A method of controlling access of a packet data service by a mobile terminal in a mobile communication network connected to a data packet network through a plurality of gateway nodes, the method comprising: Requesting an update of a routing area from a mobile terminal to a service node of the mobile communication network; The service node selects an appropriate first gateway node for the mobile terminal and inquires of its access point name (APN) cache or domain name system (DNS) server to obtain an address of the first gateway node. Confirming that the first gateway node is not a second gateway node previously connected to the mobile terminal; The service node requesting the first gateway node to generate subscriber data for the mobile terminal; Generating, by the first gateway node, subscriber data for the mobile terminal; Requesting, by the service node, a home location register to update location information of the mobile terminal; And registering, by the home location register, the identifier of the mobile terminal in correspondence with the address of the service node. 2. The method of claim 1, further comprising: requesting, by the service node, the second gateway node to delete subscriber data for the mobile terminal; And deleting, by the second gateway, subscriber data for the mobile terminal. The method of claim 1, further comprising: requesting, by the first gateway node, the mobile terminal to start a registration procedure; Transmitting, by the mobile terminal, a registration request message to the first gateway node in response to a request of the first gateway node; Transmitting, by the first gateway node, the registration request message of the mobile terminal to a home agent; And registering, by the home agent, the identifier of the mobile terminal corresponding to the address of the first gateway node in response to the registration request message. The method of claim 1, wherein the checking process comprises: Acquiring subscriber data of the mobile terminal from the second gateway node in response to the routing area update request, and referring to an access point name (APN) included in the subscriber data, the first gateway node appropriate for the mobile terminal. The method of selecting a. delete The method of claim 1, wherein the generating of the subscriber data comprises: And generating the address of the service node in the subscriber data. delete 2. The method of claim 1, wherein the service node requests the first gateway node to update subscriber data of the mobile terminal if the first gateway node is the second gateway node previously connected to the mobile terminal. , And updating, by the first gateway node, including the address of the service node in subscriber data of the mobile terminal. In a mobile communication network, A plurality of gateway nodes connecting the mobile communication network to a data packet network; Serving a mobile terminal, selecting an appropriate first gateway node for the mobile terminal from among the plurality of gateway nodes in response to a request for updating a routing area of the mobile terminal, thereby accessing an APN cache or a domain name system. (DNS) contact the server to obtain the address of the first gateway node, and if the first gateway node is not the second gateway that is already connected to the mobile terminal, the subscriber data for the mobile terminal to the first gateway node. It characterized in that it comprises a service node for requesting to create a, Wherein the service node requests a home location register to update location information of the mobile terminal so that the home location register registers the identifier of the mobile terminal in correspondence with the address of the service node. The method of claim 9, wherein the service node, And requesting the second gateway node to delete subscriber data for the mobile terminal after requesting the first gateway node to generate the subscriber data. The method of claim 9, wherein the first gateway node, Requesting the mobile terminal to start a registration procedure and receiving a registration request message from the mobile terminal, the registration request message is transmitted to a home agent, so that the home agent sends the identifier of the mobile terminal to the first gateway node. And register to correspond to an address. The method of claim 9, wherein the service node, Acquiring subscriber data of the mobile terminal from the second gateway node in response to the routing area update request, and referring to an access point name (APN) included in the subscriber data, the first gateway node appropriate for the mobile terminal. Selecting the mobile communication network. delete The method of claim 9, wherein the first gateway node, And generate the subscriber data by including the address of the service node. delete The method of claim 9, wherein the service node, If the first gateway is the second gateway node previously connected to the mobile terminal, the first gateway node is requested to update the subscriber data of the mobile terminal, so that the first gateway node receives the subscriber data of the mobile terminal. And update the service node by including an address of the service node. The method of claim 9, wherein the service node, The packet radio service node for GPRS.

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