KR20060131364A - Method between portable internet and mobile communication network using ppp proxy ability - Google Patents

Abstract

An interworking method between a mobile communication network and a portable Internet network by using a PPP(Point to Point Protocol) proxy function is provided to establish a P-P interface between an IWU(Inter Working Function) connected with the portable Internet network and a PDSN(Packet Data Serving Node) connected with the mobile communication network, therefore a seamless service is supported. A dual-mode terminal(5) which is transceiving traffic data through a portable Internet network(20) demands handoff to a mobile communication network(10). Portable Internet network information is sent to a PDSN(100), while an R-P connection is established. An IP(Internet Protocol) is allocated to the terminal(5) to set a PPP connection between the terminal(5) and the PDSN(100). Based on the portable Internet network information, an IWU(110) which has transceived the traffic data before the terminal(5) was handed off is set to an anchor PDSN. It is recognized that the terminal(5) is handed off by communication with the IWU(110), IP information allocated before the terminal(5) was handed off to the mobile communication network(10) is sent to the anchor PDSN, then traffic routing information is modified. The portable Internet network(20) sends the IP information to the PDSN(100) to set a P-P connection between the PDSN(100) and the IWU(110). According to the set P-P connection, the traffic data is transceived through the mobile communication network(10), the PDSN(100), the IWU(110), and the portable Internet network(20).

Description

METHODO BETWEEN PORTABLE INTERNET AND MOBILE COMMUNICATION NETWORK USING PPP PROXY ABILITY}

1 is a schematic diagram showing an interworking system between a mobile communication network and a portable Internet network using a PPP proxy function according to the present invention;

2 is a diagram sequentially illustrating an outgoing call processing process of a portable Internet network in an interworking system between a mobile communication network and a portable Internet network using a PPP proxy function according to the present invention.

3 is a diagram sequentially illustrating a handoff process from a portable Internet network to a mobile communication network in an interworking system between a mobile communication network and a portable Internet network using a PPP proxy function according to the present invention.

4 is a diagram sequentially illustrating a process of returning to a portable Internet network in an interworking system between a mobile communication network and a portable Internet network using a PPP proxy function according to the present invention.

FIG. 5 is a diagram sequentially illustrating a call origination process of a mobile communication network in an interworking system between a mobile communication network and a portable Internet network using a PPP proxy function according to the present invention.

FIG. 6 is a diagram sequentially illustrating a handoff process from a mobile communication network to a portable internet network in an interworking system between a mobile communication network and a portable internet network using a PPP proxy function according to the present invention.

7 is a diagram sequentially illustrating a process of returning to a mobile communication network in an interworking system between a mobile communication network and a portable Internet network using a PPP proxy function according to the present invention.

<Description of the code | symbol about the principal part of drawing>

5: dual mode terminal 10: mobile communication network

12: BTS 14: BSC

16: PCF 20: Portable Internet

22: RAS 24: ACR

30: DCN 40: Internet

100: PDSN 110: IWU

The present invention relates to an integrated system of a 3rd generation mobile communication network and a wireless LAN or a portable Internet network. In particular, the present invention provides an effective network configuration and handoff in a multi-access system environment in which a CDMA2000 network and a portable Internet (PI) coexist. The present invention relates to a method of interworking between a mobile Internet and a mobile communication network using a PPP proxy function that can be supported.

In general, users require a variety of services regardless of the network type, and network service providers are trying to satisfy the needs of users through cheaper and more economical access and network technologies. As a result, systems adopting various types of wired and wireless access technologies have emerged, and providing an effective interworking service between these systems has been raised as a major issue.

In order to provide interworking services between different access systems, the first step is to develop interworking service standards for 3G mobile communication and WLAN. However, these two systems have evolved independently of each other and use different specifications and standards. Therefore, in order to interwork each network, various matters such as architecture, protocol structure, mobility, quality of service, authentication, security, billing, etc. must be considered, and modification and supplementation of each matter must be accompanied. The 3G-WLAN interworking method is divided into "Lossely Coupled" and "Tightly Coupled" schemes.

In a "Loosely coupled" system, the 3G network and WLAN users are independently authenticated and maintain billing or mobility support management policies. However, to support seamless communication, it must have one unified user information, and therefore requires interaction between two different networks. This requires the use of Mobile Internet Protocol (MIP) technology, but the lack of public IP resources is a problem.

Meanwhile, the "tightly coupled" coupling scheme has a structure in which a 3G core network and a WLAN are directly integrated. This is a form in which the WLAN is directly connected to the equipment of the 3G network (GGSN in the UMTS, PDSN in the CDMA2000), the WLAN is composed of one 3G access network to the 3G core network. WLAN gateways must implement all 3G protocols along with Internet protocols, and the terminal also implements Internet protocol stacks and 3G protocol stacks, changing the physical layer when both stacks are used simultaneously or when handoffs are made between two networks. This is necessary. All data sent by the terminals in the WLAN is sent through the 3G core network. In this way, different networks perform the same processing for authentication, signal strength, billing, and so on. Since WLAN traffic always uses the 3G core network, it must be designed to handle the increased traffic in network components such as PDSN and GGSN, and significant additional cost because additional 3G protocol stacks must be implemented on the WLAN interface for all terminals. Is required.

As a result, the "Loosely coupled" interworking method has a problem of high data loss and delay time during the handoff process, and the "Tightly Coupled" interworking method requires traffic reengineering of the mobile phone network and thus, There is a problem that the integration for the rest except wireless access has to be made.

An object of the present invention is to solve the problems of the prior art, by setting up a PP interface between the PDSN connected to the mobile communication network and the IWU connected to the mobile Internet network, while operating independently of each other, The present invention provides a method for interworking between a mobile Internet network and a mobile communication network using a PPP proxy function capable of supporting a continuous service by performing a handoff in a.

In order to achieve the above object, the present invention provides a mobile communication network in which a dual mode terminal for transmitting and receiving traffic data based on an IP address allocated from a mobile internet network in an interworking system consisting of an IWU interworking with a mobile internet network and a PDSN interworking with a mobile communication network A method of handing off a network, the method comprising: requesting a handoff to a mobile communication network together with the portable internet network information by a dual mode terminal transmitting and receiving traffic data through the portable internet network, and transmitting the portable internet network information to the PDSN. And establishing an RP connection, establishing an PPP connection between the PDSN and the dual mode terminal by assigning an IP to the dual mode terminal as the portable Internet network information is received. Traffic data before the dual mode terminal is handed off Setting the IWU transmitted / received as the anchor PDSN, communicating with the IWU set as the anchor PDSN, recognizing that the dual mode terminal is handed off, and assigning the allocated IP information to the anchor PDSN before being handed off to the mobile communication network. Modifying the traffic routing information after transmission, establishing a PP connection between the PDSN and the IWU by transmitting the allocated IP information to the PDSN before the handoff is performed in the portable Internet network; And transmitting and receiving the traffic data through the mobile communication network, PDSN, IWU, and portable Internet network.

On the other hand, the present invention is a handoff method of the interworking system comprising a dual mode terminal for handoff from the portable Internet network to the mobile communication network to transmit and receive traffic data through the mobile communication network, PDSN, IWU and portable Internet network, Requesting a handoff to the portable Internet network by a dual mode terminal transmitting and receiving traffic data through a mobile communication network, a PDSN, an IWU, and a portable Internet network, and an IP assigned by the portable Internet network before being handed off to the mobile communication network. Establishing traffic with the portable Internet network based on the information, informing the IWU that the dual mode terminal has been handed off, and handing off the dual mode terminal to the mobile internet network from the mobile communication network. Receiving informing information from the IWU, and transmitting to the IWU. Disable the step of updating the traffic route information on the basis of the emitter received information and, P-P connection between the IWU and the PDSN, and a step for transmitting and receiving traffic data, to the dual-mode terminal on the basis of the updated traffic routing information.

In addition, the present invention is a method for handing off a dual mode terminal for transmitting and receiving traffic data connected to the PDSN in a PPP connection setting in an interworking system consisting of an IWU interworking with a portable Internet network and a PDSN interworking with a mobile communication network. Requesting a handoff from the dual mode terminal transmitting and receiving traffic data through a mobile communication network and a PDSN to the portable Internet network and the IP information allocated when the PPP connection is established, and the IP information provided together with the handoff request. Establishing traffic between the dual mode terminal and the portable Internet network, providing the IWU with information and IP information indicating that the dual mode terminal is handed off, and before requesting a handoff based on the IP information. A PP connection is established using the dual mode terminal as the anchor PDSN as the PDSN established as the PPP connection. Updating the traffic routing information to the portable Internet network and the IWU as the PP connection setup is completed; and updating the traffic data based on the PP connection setup and the updated traffic routing information. Transmitting and receiving through the IWU, PDSN.

The present invention includes a dual-mode terminal that is handed off from the mobile communication network to the portable Internet network during the transmission and reception of traffic data through a PPP connection establishment between the PDSN and the mobile communication network to transmit and receive traffic data through the portable Internet network, IWU, PDSN A handoff method of an interworking system, the method comprising: requesting a handoff to the mobile communication network along with the portable internet network information by a dual mode terminal transmitting and receiving traffic data through the portable internet network, IWU, and PDSN; Establishing a RP connection between the mobile communication network and a PDSN according to a handoff request of the mobile station; and transmitting a message indicating to the PDSN that the dual mode terminal is a handoff from the portable Internet network, based on the message. The handoff request of the dual mode terminal is determined to be a return call And releasing a P-P connection between the PDSN and the IWU, and transmitting and receiving traffic data through the preset PPP connection.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

1 is a block diagram schematically illustrating a linkage system between a mobile communication network and a portable Internet network using a PPP proxy function according to the present invention.

Referring to FIG. 1, a system for interworking between a mobile communication network and a portable Internet network according to the present invention includes a dual mode terminal 5, a mobile communication network 10 such as a CDMA2000, a WiBro (Wireless Broadband Internet), a WLAN (Wireless LAN), and the like. The portable Internet network 20 and the dual mode terminal 5 are operated independently of each other and interlocked with each other.

In addition, the interworking system between the mobile communication network and the portable Internet network, the PDSN (Packet Data Serving Node) (100) for connecting the dual mode terminal 5 connected through the mobile communication network 10 in conjunction with the DCN (40) and It further includes an IWU (110) for connecting the dual mode terminal (5) connected via the portable Internet network 20 to the Internet 40, which is an IP network in conjunction with the DCN (40).

The mobile communication network 10 includes a base station transceiver system (BTS) 12, a base station controller (BSC) 14, a packet control function (PCF) 16, and the like, and the portable Internet network 20 includes a RAS ( Radio Access Station (22), Access Concentration Router (ACR) 24, and the like. The DCN (Data Core Network) 30 connected to the Internet 40, which is an IP network, includes a charging server 32, an authentication, authorization and accounting (AAA) 34, an HA 36, and the like. Meanwhile, the system of FIG. 1 is configured based on the mobile communication network 10 of the CDMA2000 and the portable Internet network 20 such as WiBro and WLAN. However, the system of FIG. 1 is not limited to the above system and wirelessly transmits IP or Ethernet packets. Applicable to all reliable systems.

The dual mode terminal 5 is capable of transmitting and receiving packets over the Internet by connecting to the mobile communication network 10, and transmitting and receiving packets over the Internet by connecting to the portable Internet network 20, and the mobile communication network 10 in the portable Internet network 20. In the case of handoff, the mobile internet network 20 information is provided to the mobile communication network 10, and when the handoff is performed from the mobile communication network 10 to the mobile internet network 20, its MIN information and PPP (Point to Point Protocol) Information is provided to the portable Internet network 20. Here, the PPP information is PPP connection information established with the PDSN 100 in order for the dual mode terminal 5 to transmit and receive traffic data through the mobile communication network 10.

The IWU 110 is a heterogeneous network interworking device for interworking between the mobile communication network 10 and the portable Internet network 20, which are different networks, and connects the ACR 24 and the PDSN 100 of the portable Internet network 20. When the dual mode terminal 100 is handed off from the mobile communication network 10 to the portable Internet network 20, the dual mode terminal 100 is connected to the PDSN 100 in response to a PP setup request from the ACR 24 of the portable Internet network 20. Perform a PP setup procedure, which is thus connected to the PDSN 100 via the PP interface. Here, the ACR 24 requests the IWU 110 to set up a P-P based on information received from the dual mode terminal 5, that is, MIN information and PPP information required for interworking. The IWU 110 based on the PPP information, i.e., the IP information allocated from the PDSN 100 connected with the mobile communication network 10 before the dual mode terminal 5 is handed off at the request of the ACR 24, the PDSN 100 according to the request. And establish a PP connection.

As such, since the PDSN 100 and the IWU 110 are connected to the PP interface, data traffic is transferred to the Internet 40-PDSN 100-IWU 110-ACR 24-RAS 22-dual mode. Terminal 5 is sent to a user terminal (not shown).

On the contrary, when handing off from the portable Internet network 20 to the mobile communication network 10, the dual mode terminal 5 performs an access procedure of the mobile communication network 10. At this time, the dual mode terminal 5 configures the information of the portable Internet network 20 acquired from the portable Internet network 20 as a PANID for the link between the portable Internet network 20 and the mobile communication network 10. The PDSN 100 can then inspect the ACR 24 and the IWU 110 of the portable Internet network 20 that were connected before the dual mode terminal 5 was handed off based on the PANID information. Based on this, the IWU 110 is connected to the IWU 110 through the PP interface by performing a PP setup procedure. The data traffic is thus transmitted to the Internet 40-ACR 24-IWU 30-PDSN 42-PCF 16-BSC 14-BTS 12-Dual mode terminal 5.

The IWU 110 of the present invention is an apparatus for interworking interfaces between different heterogeneous networks, that is, devices of different spatulas used in respective networks for interworking between the mobile Internet network 20 and the mobile communication network 10. In addition to determining the return call after the handoff request, the handoff request to perform the operation, and performs a PPP proxy role to perform PPP termination instead of the dual mode terminal 50 for the mobile communication network 10 using PPP. Perform.

2 is a diagram sequentially illustrating an outgoing call processing process of a portable Internet network in an interworking system between a mobile communication network and a portable Internet network using a PPP proxy function according to the present invention. 1 and 2, the interworking system between the mobile communication network and the portable Internet network according to the present invention processes the transmission from the portable Internet network as follows.

First, the dual mode terminal 5 in the portable Internet network 20 uses the radio link such as RAS synchronization and downlink parameter acquisition, uplink parameter acquisition, ranging and uplink parameter adjustment to the RAS 22 and the ACR 24. Proceed with the initial access procedure (S10).

The dual mode terminal 5 negotiates basic functions such as an IP version, an authentication policy, and a support capability of the terminal in the physical layer to the RAS 22 and the ACR 24. (S12)

The RAS 22 interoperates with the AAA 46 via the ACR 24 to authenticate the dual mode terminal 5 with the authentication mode such as authentication key exchange, security key exchange, EAP (Extensible Authentication Protocol), and TLS (Transport Layer Security). Perform (Authentication) (S14 ~ S18)

The dual mode terminal 5 transmits a registration request to the RAS 22 including the automatic repeat request (ARQ), IP management mode, IP version information, vendor ID information, etc. to the ACR 24 (S20), Upon receiving the registration request, the RAS 22 transmits the capability information and the IP version information of the terminal to the dual mode terminal 5 to the ACR 24 to perform a registration procedure. )

Since the dual mode terminal 5 does not have an IP address, it sends a DHCPDISCOVER message to the ACR 24 having a source IP address of 0.0.0.0 and a destination address of a broadcast address. At this time, the DHCPDISCOVER message is transmitted including the field value, option items, parameter request list, etc. recommended in the portable Internet standard. However, each ACR 24 must include a DHCP (Dynamic Host Configuration Protocol) server function or have a DHCP server mapped to 1: 1.

Upon receiving the DHCPDISCOVER message, the ACR 24 allocates one of the available IP pools it owns and sends a DHCPOFFER message with the source address as its IP address.

When the dual mode terminal 5 having received the DHCPOFFER message decides to use the IP address proposed by the ACR 24, it receives a DHCPREQUEST message including the proposed IP address and the IP address of the ACR 24 that proposed the IP. Send.

When the ACR 24 receives the DHCPREQUEST message from the dual mode terminal 5 to use the IP address suggested by the ACR 24, the server host name, IP address sharing time, DNS information, gateway information, and parameter request list of the ACR 24 are requested. The DHCPRESPONSE message including the option information is transmitted to the dual mode terminal 5 to complete the IP address initial assignment process. (S24) Upon receiving the DHCPRESPONSE message, the dual mode terminal 5 initializes TCP / IP and allocates from this point. Unicast communication using the received IP address is possible.

The dual mode terminal 5 performs a traffic establish procedure of setting a date time, transmitting driving parameters, and setting up a facility connection to the ACR 24 (S26).

When the traffic connection process is in progress, a traffic data transmission / reception (Traffic Flow) service is performed through the dual mode terminal 5-RAS 22-ACR 24 (S28).

3 is a diagram sequentially illustrating a handoff process from a portable Internet network to a mobile communication network in an interworking system between a mobile communication network and a portable Internet network using a PPP proxy function according to the present invention. 1 and 3, in the interworking system between the mobile communication network and the portable Internet network according to the present invention, the handoff process from the portable Internet network to the mobile communication network is processed as follows.

When the dual mode terminal 5 in the traffic data service S28 in the portable Internet network 20 determines a handoff (VHO) to the mobile communication network 10, it maintains a connection with the portable Internet network 20. In this state, a procedure (Origination / BS Ack Order) for attempting to connect to the base station system (BSS) 12, 14 of the mobile communication network 10 is performed. (S40) At this time, the BSS 12, 14 is portable. When a call setup request including a PANID for the Internet network 20 is received from the dual mode terminal 5, the mobile communication network 10 performs a handoff procedure from the portable Internet network 20 as follows.

After the BSSs 12 and 14 perform a traffic channel setup with the dual mode terminal 5 (S42), an A9 setup message including a PANID in the PCF 16 to establish an A8 connection (A9 Setup) ) Is transmitted (S44). The PCF 16 sends an A11 Registration Request message (A11 RRQ) and, in response, receives an A11 Registration Response Message (A11 RRP) message containing an authorization code, thereby connecting the RP interface between the PCF 16 and the PDSN 42. (46). At this time, the A11 registration request message includes the PANID information received from the dual mode terminal 5 through the BSS (12, 14). The PCF 16 notifies the BSSs 12 and 14 that the A8 connection is established by sending an A9 connection message (A9-Connect) to the BSSs 12 and 14 (S48).

The PDSN 100 performs a PPP setting procedure with the dual mode terminal 5 and allocates a new IP to the dual mode terminal 5 (S50). At this time, the IWU 110 allocates a new AAA 34 and a dual mode terminal 5. The authentication procedure for the) is performed (S52).

At this time, the PDSN 100 maintains the information on the portable Internet network 20 corresponding to the PANID information, that is, the ACR and IWU information. The PDSN 100 uses the IWU 110 corresponding to the PANID as the anchor PDSN and the corresponding IWU 110. Perform a PP connection setup. That is, the PDSN 100 transmits a P-P registration request message (P-P RRQ) to the IWU 110 corresponding to the PANID information for the P-P connection establishment request (S54). The P-P registration request message (P-P RRQ) includes IP information of the ACR and IP information allocated to the dual mode terminal 5 during the PPP process.

The IWU 110 sends a PP registration request message (PP RRQ) received from the PDSN 100 to the ACR 24 so that the dual mode terminal 5 hands off from the portable Internet network 20 to the mobile communication network 10. (S56)

The ACR 24 includes the IP information allocated to the dual mode terminal 5 in the portable Internet network 20 in the PP registration response message (PP RRP) and transmits the information to the IWU 110, and transmits the traffic routing information to the ACR 24. Update from the RAS 22 to the ACR 24 to the IWU 11 (S58).

The IWU 110 transmits a P-P registration response message (P-P RRP) to the PDSN 100 to inform the PDSN 100 that the P-P connection is established (S60).

Accordingly, a traffic data transmission and reception (Traffic Flow) service is performed through the dual mode terminal 5-BSSs 12 and 14-PCF ()-PDSN (100)-IWU (110)-ACR (24). ), The IWU 110 has both the IP information allocated to the dual mode terminal 5 in the mobile communication network 10 and the IP information maintained by the ACR 24 in the portable Internet network 20, and the PDSN 100. It serves as a proxy between the data received from the data and the data received from the ACR 24.

4 is a diagram sequentially illustrating a process of returning to a portable Internet network in an interworking system between a mobile communication network and a portable Internet network using a PPP proxy function according to the present invention. 1 and 4, in the interworking system between the mobile communication network and the portable Internet network according to the present invention, the return from the mobile communication network to the portable Internet network is processed as follows.

If the mobile communication network 10 determines that the dual mode terminal 5 which is a data service (S62) is a handoff (VHO) to the portable Internet network 20, the connection with the mobile communication network 10 is maintained. In one state, a connection to the portable Internet network 20 is attempted (S72). That is, the dual mode terminal 5 acquires synchronization and downlink parameters, obtains uplink parameters, and rangings. A radio link initial access procedure such as ranging and uplink parameter adjustment is performed.

The dual mode terminal 5 negotiates basic functions such as an IP version, an authentication policy, and a supporting capability of the terminal in the physical layer.

The ACR 24 performs an authentication procedure such as a security association, an authentication key exchange, a security key exchange, and an EAP TLS procedure with the dual mode terminal 5 in association with the AAA 46 server. )

The dual mode terminal 5 transmits capability information and vendor characteristic information of the terminal available in the RAS 22 to the registration request message REG_REQ including ARQ, IP management mode, IP version information, vendor ID information, and the like. The registration process is performed (S78). At this time, the registration request message REG-REQ transmitted by the dual mode terminal 5 should include information for notifying handoff (VHO) from the mobile communication network 10.

The dual mode terminal 5 maintains an existing IP address without being assigned a new IP address. That is, the ACR 24 allocates the IP assigned by the portable Internet network 20 before being handed off to the dual mode terminal 5 which is handed off from the portable Internet network 20 to the mobile communication network 10 and then returned. (S80) As the IP is assigned, a traffic procedure is performed between the dual mode terminal 5 and the RAS 22. (S82)

The ACR 24 sends a P-P registration request message (P-P RRQ) to the IWU 110 to inform the IWU 11 that the dual mode terminal 5 has been handed off from the mobile communication network 10 (S84).

Accordingly, the IWU 110 transmits a PP registration response message (PP RRP) including information indicating return to the portable Internet network 20 to the ACR 24. Accordingly, the ACR 24 sends the traffic routing information to the ACR (ACR). 24)-Update from IWU 110 to ACR 24-RAS 22. (S86)

The IWU 110 performs a PP disconnection procedure with the PDSN 100 for the dual mode terminal 5 that has been handed off, and the PDSN 100 clears the PPP session for the dual mode terminal 5. In step S88, the packet data release procedure is performed.

Accordingly, the traffic data transmission / reception (Traffic Flow) service is performed through the dual mode terminal 5-RAS 22-ACR 24 (S90).

5 is a diagram sequentially illustrating a call origination process of a mobile communication network in an interworking system between a mobile communication network and a portable Internet network using a PPP proxy function according to the present invention. 1 and 5, in the interworking system between the mobile communication network and the portable Internet network according to the present invention, the call origination process of the mobile communication network proceeds as follows.

The dual mode terminal 5 attempts to orient to the BSSs 12 and 14 for packet data service (S200).

The dual mode terminal 5 proceeds with the traffic channel setup procedure with the BSSs 12 and 14 (S202), and the BSSs 12 and 14 transmit the A9 setup message (A9_Setup) to the PCF 16 for the A8 interface configuration. It transmits to (16) (S204). Accordingly, the PCF 16 establishes an R-P connection with the PDSN 100 and transmits an A9 connection message (A9_Connect) to the BSSs 12 and 14 (S206 and S208).

Thereafter, the dual mode terminal 5 performs a PPP connection establishment procedure with the PDSN 100 and PPP connection with the PDSN 100. (S210) Accordingly, the PDSN 100 is connected to the AAA 34 of the DCN 30. The authentication procedure for the dual mode terminal 5 is performed (S212).

Dual mode terminal 5-BSS (12, 14)-PCF (16)-PDSN (42)-Traffic data transmission and reception for the packet data service is performed via the IP network / traffic server (S214).

6 is a diagram sequentially illustrating a handoff process from a mobile communication network to a portable internet network in an interworking system between a mobile communication network and a portable internet network using a PPP proxy function according to the present invention. 1 and 6, the interworking system between a mobile communication network and a portable internet network according to the present invention proceeds as follows.

In the mobile communication network 10, the dual mode terminal 5, which is in data service (S212), determines a handoff (VHO) to the portable Internet network 20 (S220).

The dual mode terminal 5 attempts to connect to the portable Internet network 20 while maintaining the connection with the mobile communication network 10. That is, the user terminal proceeds with a radio link initial access procedure such as synchronization and downlink parameter acquisition, uplink parameter acquisition, ranging and uplink parameter adjustment, etc. (S222).

The dual mode terminal 5 negotiates basic functions such as an IP version, an authentication policy, and a support capability of the terminal in the physical layer.

The ACR 24 performs an authentication procedure such as authentication key exchange, security key exchange, and EAP TLS procedure with the dual mode terminal 5 in association with the AAA 46. (S226 to S230)

The dual mode terminal 5 registers capability information and vendor characteristic information of the terminal available in the ACR 24 for a registration request including ARQ, IP management mode, IP version information, vendor ID information, and the like (REG_REQ). And the registration procedure is performed by transmitting the response message (REG_RSP) (S232, S234). At this time, the registration request message (REG-REQ) transmitted by the dual mode terminal 5 is handed off from the mobile communication network 10 ( VHO) should include information to inform you.

The dual mode terminal 5 performs a traffic setting procedure with the RAS 22 using the existing IP address without being assigned a new IP address (S236).

Then, the ACR 24 requests the PP connection establishment request from the information indicating that the dual mode terminal 5 has been handed off from the mobile communication network 10 and the IP information assigned to the dual mode terminal 5 in the mobile communication network 10. Notify the IWU 110 through the PP registration request message (PP RRQ).

The IWU 110 attempts to establish a P-P connection by transmitting a P-P registration request message (P-P RRQ) received from the ACR 24 to the PDSN 100 to which the dual mode terminal 5 belongs before being handed off. That is, the IWU 110 attempts to establish a P-P connection using the PDSN 100 to which the dual mode terminal 5 belongs as an anchor PDSN before being handed off (S240).

The PDSN 100 receiving the PP registration request message (PP RRQ) from the IWU 110 transmits the PP registration response message (PP RRP) to the IWU 110, thereby connecting the PP between the PDSN 100 and the IWU 110. Informs that the setting is completed (S242).

The IWU 110 transmits a PP registration response message (PP RRP) to inform the ACR 24 that the PP connection establishment with the PDSN 100 is completed (S244) and receives a PP registration response message (PP RRP). An ACR 24 updates the traffic routing information from the RAS 22-ACR 24-Internet 40 to the RAS 22-ACR 24-IWU 110.

The IWU 110 does not reestablish the PPP connection with the PDSN 100 and performs PPP proxy with the PDSN 100 using IP information assigned to the dual mode terminal 5 received from the ACR 24.

Accordingly, the traffic data transmission and reception (Traffic Flow) service is provided through the dual mode terminal 5-RAS 22-ACR 24-IWU 110-PDSN () (S246), and the IWU 110 is The packet received from the ACR 24 is converted into a PPP packet and transmitted to the PDSN 100, and the packet received from the PDSN 100 is converted into a packet that can be processed by the ACR 24 and transmitted to the PDSN 100.

7 is a diagram sequentially illustrating a process of returning to a mobile communication network in an interworking system between a mobile communication network and a portable Internet network using a PPP proxy function according to the present invention. 1 and 7, in the interworking system between the mobile communication network and the portable Internet network according to the present invention, the process of returning to the mobile communication network proceeds as follows.

When the dual mode terminal 5 which is in service (S246) in the portable internet network 20 determines the VHO to the mobile communication network 10, the dual mode terminal 5 maintains the call in the portable internet network 20. While attempting to connect to the BSS (12, 14) of the mobile communication network 10, and proceeds to the traffic setting process (S250, S252) At this time, the hand-off from the portable Internet network 20 to the mobile communication network 10 again The dual mode terminal 5 modifies the information on the portable Internet network 20 to match the PANID and transmits the information to the BSSs 12 and 14 before being handed off.

The BSSs 12 and 14 transmit an A9 setup message to the PCF 16 including the PANID received from the dual mode terminal 5 to establish the A8 connection (S254).

The PCF 16 establishes an RP connection by sending an A11 registration request message to the PDSN 100 and receiving an A11 registration response message including an authorization code in response (S256). In this case, the PCF 16 establishes a dual mode terminal. In order to inform the PDSN 100 that the device 5 is the handoff from the portable Internet network 20, P5 includes the PANID in the A11 registration request message and transmits it to the PDSN 100.

Accordingly, the PDSN 100 determines that the dual mode terminal 5 is the return call through the PANID in the A11 registration request message and performs a P-P connection release procedure with the IWU 110 (S258).

After the PCF 16 informs the BSS 12 and 14 that the A8 connection is established (S260), since the PPP setting between the dual mode terminal 5 and the PDSN 100 is already set, the PCF 16 resets the existing PPP setting. Based on the PPP connection between the dual mode terminal 5 and the PDSN (100) (S262).

That is, a traffic data transmission / reception (Traffic Flow) service is provided through the dual mode terminal 5, the BSSs 12 and 14, the PCF 16, and the PDSN 100 (S264).

As described above, the present invention can support a continuous service by performing a handoff when the user terminal is moved between the mobile communication network and the portable internet network while the mobile communication network and the portable internet network are operated independently of each other.

Therefore, the service provider according to the present invention can provide a better communication service to the user through independent or interlocked operation of the mobile communication network and the portable Internet network as well as more effective network configuration.

Claims (8)

In a linkage system consisting of an IWU interworking with a portable Internet network and a PDSN interworking with a mobile communication network, a dual mode terminal for transmitting and receiving traffic data based on an IP address assigned by the portable internet network is handed off to the mobile communication network. Requesting a handoff from the dual mode terminal transmitting and receiving traffic data through the portable internet network to the mobile communication network together with the portable internet network information; Transmitting the portable Internet network information to the PDSN and establishing an R-P connection; Setting up a PPP connection between the PDSN and the dual mode terminal by assigning an IP to the dual mode terminal as the portable Internet network information is received; Setting an IWU, which has transmitted and received traffic data, before the dual mode terminal is handed off as an anchor PDSN based on the portable Internet network information; Recognizing that the dual mode terminal is handed off by communicating with the IWU set as the anchor PDSN, and transmitting the allocated IP information to the anchor PDSN before being handed off to the mobile communication network, and modifying the traffic routing information; Setting up a P-P connection between the PDSN and the IWU by transmitting the allocated IP information to the PDSN before the handoff is performed in the portable Internet network;  Transmitting and receiving the traffic data through the mobile communication network, PDSN, IWU, portable Internet network according to the P-P connection setting Interworking method between a mobile Internet network and a mobile communication network using a PPP proxy function comprising a. The method of claim 1, The IWU stores an IP assigned during the PPP connection establishment and IP information of a dual mode terminal maintained in the portable Internet network, and serves as a proxy between data received from the PDSN and data received through the portable Internet network. Interworking method between a mobile Internet network and a mobile communication network using a PPP proxy function, characterized in that for performing. The method of claim 1, The portable Internet network information is changed according to the PANID of the mobile communication network and provided to the mobile communication network, the method of interworking between the mobile Internet network and the mobile communication network using a PPP proxy function. The method of claim 1, And the traffic routing information is changed by the portable internet network via the IWU designated as the anchor PDSN. A handoff method of an interworking system comprising a dual mode terminal handed off from a portable internet network to a mobile communication network to transmit and receive traffic data through the mobile communication network, PDSN, IWU, and portable internet network, Requesting a handoff to the portable Internet network by a dual mode terminal transmitting and receiving traffic data through the mobile communication network, PDSN, IWU, and portable Internet network; Establishing traffic with the portable Internet network based on an IP assigned by the portable Internet network before being handed off to the mobile communication network; Notifying the IWU that the dual mode terminal is handed off; Receiving information from the IWU indicating that the dual mode terminal is handoff for returning from the mobile communication network to the portable Internet network; Updating traffic routing information based on the information received from the IWU; Canceling the P-P connection between the IWU and the PDSN and transmitting and receiving traffic data to the dual mode terminal based on the updated traffic routing information; Interworking method between a mobile Internet network and a mobile communication network using a PPP proxy function comprising a. The method of claim 5, And after the P-P connection between the IWU and the PDSN is released, the PPP session between the PDSN and the dual mode terminal is cleared. In the interworking system consisting of IWU interworking with the portable Internet network and PDSN interworking with the mobile communication network, a method for handoff a dual-mode terminal connected to the PDSN to transmit and receive traffic data in a PPP connection setting, Requesting a handoff from the dual mode terminal transmitting / receiving traffic data through the PDSN with the mobile communication network to the portable Internet network and the IP information allocated when establishing the PPP connection; Establishing traffic between the dual mode terminal and the portable Internet network using IP information provided together with the handoff request; Providing the IWU with information and IP information indicating that the dual mode terminal has been handed off; Establishing a P-P connection by using the dual mode terminal as the anchor PDSN as the anchor PDSN before requesting the handoff based on the IP information; Updating the traffic routing information to the portable Internet network and the IWU as the P-P connection is completed; Transmitting and receiving the traffic data through the portable Internet network, the IWU, and the PDSN based on the P-P connection setting and the updated traffic routing information. Interworking method between a mobile Internet network and a mobile communication network using a PPP proxy function comprising a. A hand of an interworking system including a dual mode terminal that is handed off from the mobile communication network to the portable internet network during the transmission and reception of traffic data through a PPP connection setting between the PDSN and the mobile communication network, and transmits and receives the traffic data through the portable Internet network, IWU, and PDSN. As the off method, Requesting, by the dual mode terminal transmitting and receiving traffic data through the portable Internet network, the IWU and the PDSN, to the mobile communication network together with the portable Internet network information; Setting up an R-P connection between the mobile communication network and a PDSN according to a handoff request of the dual mode terminal, and transmitting a message indicating to the PDSN that the dual mode terminal is a handoff from the portable Internet network; Determining that the handoff request of the dual mode terminal is a return call based on the message, and releasing the P-P connection between the PDSN and the IWU; Transmitting and receiving traffic data through the preset PPP connection Interworking method between a mobile Internet network and a mobile communication network using a PPP proxy function comprising a.

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