KR100674281B1 - Method for inter connecting mobile telecommunication network and portable internet network - Google Patents

Abstract

The present invention relates to a method of interworking between a mobile communication network and a portable internet network capable of supporting a continuous service by performing a handoff between a mobile communication network and a portable internet network, in particular from a user terminal in a traffic data service to a mobile communication network in a portable internet network. If a handoff request is made, an attempt is made to access the base station of the mobile communication network, the base station proceeds to set up a traffic channel with the user terminal, establishes an interface connection between the mobile communication network and the core network connected to the Internet network, and the user terminal core network. The data link layer is set at the serving node of the network, the user equipment finds the router connected from the portable internet network in the interworking device between the portable internet network and the core network, and notifies the handoff from the portable internet network. Address to your device The user terminal assigns an IP address for the traffic transmission path from the portable Internet network to the mobile communication network to the serving node of the core network by the IP address, updates the changed traffic routing information to the router in the companion device, and moves the user terminal from the user terminal. After setting up a call in communication and transmitting and receiving traffic data through a core network, a companion device, a router of a portable internet network, and the Internet, the user terminal releases the call of the portable internet network.

 Mobile network, portable internet network, hand off

Description

Interworking method between mobile communication network and mobile internet network {METHOD FOR INTER CONNECTING MOBILE TELECOMMUNICATION NETWORK AND PORTABLE INTERNET NETWORK}

1 is a configuration diagram schematically showing an interworking system between a mobile communication network and a portable Internet network to which the present invention is applied;

2 is a diagram sequentially illustrating a transmission process of a portable Internet network in an interworking system between a mobile communication network and a portable Internet network according to the present invention;

3 is a diagram sequentially illustrating a handoff process from a mobile Internet network to a mobile communication network in a system for interworking between a mobile communication network and a portable Internet network 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 according to the present invention;

5 is a view sequentially showing a call origination process of a mobile communication network in an interworking system between a mobile communication network and a portable Internet network according to the present invention;

FIG. 6 is a view 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 according to the present invention; FIG.

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 according to the present invention;

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

10: mobile communication network 12: BTS

14: BSC 16: PCF

20: Mobile Internet Network 22: RAS

24: ACR 30: IWU

40: DCN 42: PDSN

44: router 46: AAA

50: Internet

The present invention relates to an interworking technology between a mobile communication network and a portable internet network, and in particular, in a multi-access environment in which a mobile communication network and a portable internet network coexist, a hand-off is performed between a mobile communication terminal and a portable internet terminal. The present invention relates to a method of interworking between a mobile communication network and a portable Internet network capable of providing a seamless service.

Currently, network service providers are developing network systems employing various types of wired / wireless access technologies to satisfy users' needs through cheaper and more economical access and network technologies. Therefore, interworking technology becomes an important issue between different access network systems, such as the development of interworking services for 3G mobile communication networks and portable Internet networks. Here, the portable Internet refers to a communication service that enables users to enjoy necessary information and entertainment by accessing the Internet at high speed in a mobile environment.

Since mobile networks and mobile Internet networks use different standards and standards, various matters such as architecture, protocol structure, mobility, quality of service, authentication, security, and billing should be considered for interworking. It should be accompanied by modifications and supplements.

The interworking method between the 3G mobile communication network and the portable Internet network is divided into a loose coupled interlocking system and a tight coupled interworking system.

The loose-coupled system authenticates the users of the mobile network and the mobile internet network independently of each other and maintains the billing or mobility support management policy, but must have one unified user information in order to support seamless communication. Interaction between the two networks is necessary. This requires the use of MIP (Mobile IP) technology, but the lack of public IP resources has emerged as a problem.

On the other hand, the tight coupled system has a structure in which the 3G core and the portable internet network are directly integrated, and the portable internet network is directly connected to the 3G network equipment (GGSN in the case of UMTS and PDSN in the case of CDMA-2000). The mobile Internet network is composed of 3G access network to 3G core network. All 3G protocols should be implemented together with the Internet protocol in the gateway of the mobile Internet network, and the 3G protocol stack should be implemented in the terminal as well as the Internet protocol stack to use both stacks at the same time or to hand off between the two networks. The process of changing the physical layer is required. All data sent by the terminal in the portable Internet network is sent through the 3G core network, the different networks perform the same processing for authentication, signal strength, transmission, billing, and the like. Since mobile Internet traffic always uses 3G core network, it must be designed to handle increased traffic in network components such as Packet Data Serving Node (PDSN) and Gateway GPRS Support Node (GGSN). The additional 3G protocol stack must be implemented on the interface of the Internet, which requires considerable additional costs.

However, the above-described loose-coupled interworking system has a problem of high data loss and delay time during handoff process, and the type-coupled interworking method requires re-engineering of the mobile communication network. Integration should be done except for access to the Internet and the mobile Internet.

An object of the present invention is to solve the problems of the prior art as described above, the mobile communication network and the mobile Internet network operating independently of each other while performing a handoff between these heterogeneous networks to support the continuous service and The present invention provides a method for interworking with a mobile Internet network.

In order to achieve the above object, the present invention provides a method of interworking a mobile communication network and a portable internet network, and attempts to access a base station of a mobile communication network when a user terminal requesting a handoff from a user terminal in a traffic data service to the mobile communication network in the portable internet network. Setting up a traffic channel with a user terminal at a base station and establishing an interface connection between a mobile communication network and a core network connected to the Internet network; and setting a data link layer at a serving terminal of the core network at the user terminal. And notifying a handoff from the portable internet network by searching for a router that the user terminal accesses from the portable internet network in the interworking device between the portable internet network and the core network, and sending the IP address received from the router to the user terminal. Assigning, and the user terminal is I Assigning an IP for the traffic transmission path from the portable Internet network to the mobile communication network to the serving node of the core network using the P address, updating the changed traffic routing information in the router at the companion device, Setting up a call to transmit and receive traffic data through a core network, a companion device, a router of a portable internet network, and the internet; and releasing the call of the portable internet network at a user terminal.

In order to achieve the above object, another method of the present invention provides a method of interworking a mobile communication network and a portable internet network, wherein when a user terminal requesting a traffic data service in the mobile communication network returns to the portable internet network, Attempting to connect to the portable Internet network while maintaining a connection with the mobile communication network, requesting a registration from the user terminal to the router of the portable internet network, and performing a registration procedure based on the information of the terminal from the router; The step of completing the traffic setting procedure between the user terminal and the router by sharing the IP address through the router in the user terminal, and transmitting the traffic data between the user terminal and the router, the routing path from the router to the mobile Internet network and the Internet network. Renewal, Mobile Internet and Core Disconnecting the call of the mobile communication network from the interworking device between the networks, disconnecting the interface connection between the serving node of the core network and the mobile communication network from the interworking device, and releasing the mobile communication network call of the user terminal in which the handoff occurred in the mobile communication network. And setting up a call between the user terminal and the portable Internet network.

In order to achieve the above object, another method of the present invention provides a method of interworking a mobile communication network and a portable internet network, wherein when a user terminal requesting a handoff from the user terminal in a traffic data service in the mobile communication network to the portable internet network, Attempting to connect to a router, establishing a traffic connection with a user terminal in a router, and establishing an interface connection with a serving node of a core network in an interworking device between a portable Internet network and a core network connected to the Internet network; Disconnecting the existing interface from the serving node of the core network and granting a new interface of the companion device; updating the traffic routing path from the router to the companion device; and serving as a PPP proxy at the serving node of the core network. User terminal, mobile internet network, interworking device and core network A method for transmitting and receiving data traffic through the node, turn off the mobile communication network side call of the user terminal in a portable Internet network and a step of completing the user terminal and the call set-up of the portable Internet network.

In order to achieve the above object, another method of the present invention provides a method of interworking a mobile communication network and a portable internet network, wherein when a user terminal requesting a handoff to a mobile communication network from a mobile data network requests a handoff to the mobile communication network, Attempting to connect to a base station of a mobile communication network while maintaining a call of the mobile Internet, proceeding with a traffic setting process at the base station, and connecting an interface to a serving node of a core network connected to the Internet in a mobile communication network; Setting a data link layer through a PPP setting procedure with a serving node of a core network in a terminal, allocating an IP address used by a user terminal in a serving node of a core network, and accessing a mobile Internet network and an internet network User terminal from interworking device between core network to router of portable internet network Requesting to release the call of the mobile device, and releasing the call of the portable Internet network at the request of the router from the user terminal and establishing a call of the user terminal and the mobile communication network.

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 configuration diagram schematically showing an interworking system between a mobile communication network and a portable Internet network to which the present invention is applied.

Referring to FIG. 1, the interworking system between the mobile communication network and the portable Internet network to which the present invention is applied includes a mobile communication network 10 such as CDMA2000 and a portable Internet network 20 such as WiBro (Wireless Broadband Internet) and WLAN (Wireless LAN). These are operated independently of each other and interlocked with each other.

The mobile communication network 10 includes a user terminal (not shown), a base station (BTS), a base station controller (BTS) 12, a base station controller (BSC) 14, a packet control function (PCF), and the like. The mobile Internet network 20 includes a user terminal (not shown), a RAS (Radio Access Station) 22, a router (ACR: Access Concentration Router, ACR) 24, and the like. do. The core network (DCN) 40 connected to the Internet 50, which is an IP network, is a serving node (PDSN) 42 and a router 44. ), AAA (Authentication, Authorization and Accounting) 46, 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, WLAN, etc., but is not limited to the system, and transmits and receives IP or Ethernet packets wirelessly. Applicable to all possible systems.

The interworking system to which the present invention is applied further includes an interworking unit (IWU) 30, which is a heterogeneous network interworking device, for interworking between the mobile communication network 10 and the portable internet network 20, which are different networks. The IWU 30 connects between the ACR 24 of the portable Internet network 20 and the PDSN 42 of the DCN 40, and the PDSN 42 when moving from the mobile communication network 10 to the portable Internet network 20. It acts as a PCF to send a RP (BSC-PDSN Interface) registration request. The ACR 24 to which the mobile user terminal (not shown) is connected requests the IWU 30 to connect to the mobile communication network 10, and the IWU 30 that has received the connection request is connected to the mobile communication network 10. It is connected to the PDSN 42 which was connected to the RP interface. From the point of view of the PDSN 42, the user terminal is considered to have moved to another PCF, and the data traffic is transferred to the Internet 50-PDSN 42-IWU 30-ACR 24-RAS 22-User terminal ( Not shown).

On the contrary, when moving from the mobile Internet network 20 to the mobile communication network 10, the IWU 30 operates as an L2TP Network Server (LNS) in which a Layer 2 Tunneling Protocol (L2TP) tunnel is connected to the PDSN 42. That is, the PDSN 42 to which the mobile user terminal is connected requests an L2TP tunnel connection to the IWU 30, and the IWU 30 receiving the connection request sends a traffic path to the ACR 24 to which the user terminal is connected. 30). The data traffic is thus transmitted to the Internet 50-ACR 24-IWU 30-PDSN 42-PCF 16-BSC 14-BTS 12-User Terminal (not shown).

2 is a diagram sequentially illustrating a transmission process of a portable Internet network in an interworking system between a mobile communication network and a portable Internet network 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, a dual-mode portable subscriber station (DUAL-PSS) 2 in the portable Internet network 20 acquires RAS synchronization and downlink parameters for the RAS 22 and the ACR 24, acquires uplink parameters, A wireless link initial access procedure such as ranging and uplink parameter adjustment is performed (S10). Here, the dual mode refers to a mode in which both user terminals communicate in a mobile communication network and a portable Internet network.

In addition, the user terminal 2 negotiates with the RAS 22 and the ACR 24 basic functions such as an IP version, an authentication policy, and support capabilities of the terminal in the physical layer.

The ACR 24 performs authentication procedures such as authentication key exchange, security key exchange, Extensible Authentication Protocol (EAP), and Transport Layer Security (TLS) with the user terminal 2 in conjunction with the AAA 46. (S14-S16)

The user terminal 2 registers a registration request message (REG_REQ) including an Automatic Repeat Request (ARQ), an IP management mode, IP version information, vendor ID information, and International Mobile System Identifier (IMSI) information. In this case, IMSI is information for VHO (Vertical Handover) which is a handoff.

The ACR 24 transmits the capability information and the IP version information of the terminal to the user terminal 2 to transmit a message REG_RSP to perform a registration procedure.

Since the user terminal 2 does not have an IP address, it sends a DHCPDISCOVER message to the ACR 24 with the source IP address of 0.0.0.0 and the destination address of the broadcast address (S22). Transmits the field values, option items, and parameter request lists recommended by the mobile 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 transmits a DHCPOFFER message with the source address as its IP address (S24).

When the user terminal 2 receiving the DHCPOFFER message decides to use the IP address proposed by the ACR 24, it transmits a DHCPREQUEST message including the proposed IP address and the IP address of the ACR 24 that proposed the IP. (S26)

When the ACR 24 receives the DHCPREQUEST message to use the IP address proposed by the user terminal 2, the ACR 24 requests the server host name, IP address sharing time, DNS information, gateway information, and parameter request list. A DHCPRESPONSE message including information is sent to the user terminal 2 to complete the initial IP address assignment process. (S28) Upon receiving the DHCPRESPONSE message, the user terminal 2 initializes TCP / IP and then allocates the IP address. Unicast communication is enabled. The server host name information of the ACR included in the 'sname' field of this message is the Network Access Identifier (NAI) of Point-to-Point Protocol (PPP) authentication when the user terminal 2 has VHOed to the mobile communication network 10. Use as a value.

The user terminal 2 performs a traffic establish procedure of setting a date time, transmitting a driving parameter, and establishing a facility connection to the ACR 24 (S30).

When the traffic connection process is in progress, a traffic data transmission and reception (Traffic Flow) service is performed through the user terminal 2-RAS 22-ACR 24 (S32).

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 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 user terminal 2 in the traffic data service S32 in the portable Internet network 20 determines a handoff (VHO) to the mobile communication network 10, the connection with the portable Internet network 20 is maintained. In this state, a procedure (Origination / BS Ack Order) of attempting to access the BSS (Base Station System) 12 or 14 of the mobile communication network 10 is performed.

The BSSs 12 and 14 perform a traffic channel setup with the user terminal 2 (S42), and then transmit an A9 setup message (A9 Setup) to the PCF 16 to establish an A8 connection. The PCF 16 sends an A11 Registration Request message (A11 RRQ) to the PDSN 42 and receives the A11 Registration Response Message (A11 RRP) message containing an authorization code in response to the PCF 16 and the PDSN 42. Set up an RP interface connection between them. 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 (S44).

The user terminal 2 proceeds to the PPP configuration procedure to the PDSN 42 and transmits a Link Control Protocol (LCP) format request message (PPP LCP Conf-Req: Configure-Request). The PDSN 42 establishes a data link layer by negotiating options necessary for the link layer through its response, an LCP type acknowledge message (PPP LCP Conf-Ack: Configure-Acknowledge) (S46).

In addition, the user terminal 2 transmits a CHAP Challenge and CHAP Response message to the PDSN 42 to proceed with the authentication process. (S48) The user terminal 2 communicates with the ACR 24 in the portable Internet network 20. NAI information created using the server host name ('sname' field value of the DHCP message) received from the ACR 24 during DHCP configuration is used for the authentication process with the PDSN 42. However, all host name information of the ACR 24 should be registered in the AAA 46 server as an L2TP domain, and the IP address of the IWU 30 controlling each ACR 24 is LNS (L2TP Network Server). Must be registered. Then, when the IWU 30 finds the anchor ACR 24 connected to the portable Internet network 20, the ACR 24 is found by referring to the NAI value of the terminal received from the PDSN 42 after the L2TP setting. Can be.

The PDSN 42 includes realm information (what information?) Received from the user terminal 2 when the authentication request message (Acess_Req) is transmitted to the AAA 46 server. However, in the AAA 46, realm information of the user terminal 2 should be registered as a server domain capable of L2TP, and information of the IWU 30 to form an L2TP tunnel for the domain should be registered. The AAA 46 transmits a response message (Access_Resp) including the IP information of the IWU to form the L2TP tunnel to the PDSN 42 (S50).

The PDSN 42 proceeds to establish an L2TP Control Connection for forming an L2TP tunnel with the IWU 30, which is an LNS received from the AAA 46, as an L2TP Access Concentrator (LAC). It includes L2TP tunnel authentication procedures (SCCRQ, SCCRP, SCCCN, ZLB ACK) using Challenge Handshake Authentication Protocol (CHAP), for which the PDSN (LAC) 42 and IWU (LNS) 30 have a shared secret. ) Must be registered.

The PDSN 42 transfers the LCP (Link Control Protocol) information, CHAP Challenge, and CHAP Response values (ICRQ, ICRP, ICCN ZLB ACK) negotiated with the user terminal 2 to the IWU 30 during the L2TP session establishment process. Transmit. (S54)

The IWU 30 has all the ACR information under control, and finds the ACR 24 that the user terminal 2 has accessed from the portable Internet network 20 through the NAI information received from the LAC. When the IWU 30 finds the ACR to which the user terminal 2 has connected, the IWU 30 notifies the user terminal 2 that the authentication is completed through the L2TP tunnel. (S56) For example, the NAI received from the user terminal 2 In the case of MIN@acr11.iwu1.sktelecom.com, the IWU 30 has an ACR corresponding to acr_id (here acr11) under its control, and among the LCP negotiation information with the user terminal received from the PDSN 42, the CHAP Challenge and If the CHAP Response value is correct, the CHAP success message (CHAP Success) is transmitted to the corresponding user terminal 2 (S56).

The IWU 30 sends an AI registration request message (AI RRQ) to the ACR 24 found in the above procedure, informing the ACR 24 that a handoff (VHO) from the portable Internet network 20 has occurred. S58) At this time, the IWU 30 includes an IWU Session ID (ISI) in a Session Specific Extension (SSE) key field of the AI registration request message. This value is an identifier for distinguishing each call between ACR and IWU. Used as a key value of the General Routing Encapsulation (GRE) protocol for traffic data transmission between IWUs. It must be unique for all calls. The ACR 24 responds with an AI registration response message (AI RRP) including IP address information allocated to the user terminal 2 in the portable Internet RAN 20. (S58) Since the call of the mobile communication network has not been completed yet. The ACR 24 continues to transmit data through the RAS 22 to the user terminal 2 and the Internet 50, which is an IP network, without changing the routing path.

The IWU 30 assigns the IP address of the terminal received from the ACR 24 to the user terminal 2 during the Internet Protocol Control Protocol (IPCP) process. (S60) If the user terminal 2 is the portable Internet network 20 Step S58 may be omitted when requesting an existing IP address assignment by including the IP address allocated in the IPCP Conf_Req: Configure-Request message. Negotiate not to do IP header compression. When the dual mode user terminal 2 transmits an IPCP establishment response message (IPCP Conf_Ack) to the PDSN 42, a trigger point for a traffic transmission path from the portable Internet network 20 to the mobile communication network 10 To the point where IP allocation is completed through the IPCP step of PPP. Accordingly, the dual mode user terminal 2 starts data transmission of the mobile communication network 10 from this point in time.

When the PPP setting process is completed, the IWU 30 sends an A-I registration request message (AI-RRQ) to notify the ACR 24 of the routing information change. The ACR 24 responds with an AI Registration Response message (AI-RRP) and transmits traffic routing information to the RAS 22-ACR 24-IP 50 in the Internet 50 of the IWU 30-ACR 24-. The network 50 is updated to the Internet 50, which is an IP network, and the changed routing path is applied to data transmission (S62).

The ACR 24 transmits a call release request message DSD_REQ to the user terminal 2 to release the call on the portable Internet network side of the user terminal 2 on which the handoff to the mobile communication network 10 has occurred. S64)

User terminal (2)-BSS (12, 14)-PCF (16)-PDSN (42)-IWU (30)-ACR (24)-Traffic data transmission and reception via Internet (50) with IP network / traffic server Is done. The IWU 30 removes the L2TP and PPP headers from the user terminal 2 through the mobile communication network 10, assembles them into one IP packet (PPP Encapsulated Traffic Data), and converts them into GRE packets. After that, it transmits to the ACR 24, converts the GRE packet received from the ACR 24 into PPP / L2TP format, and transmits the GRE packet to the mobile communication network 10 through the L2TP tunnel with the PDSN 42 (S66).

The user terminal 2 responds to the call release request of the ACR 24 (DSD_RSP) and releases the call on the portable Internet network 20 side of the user terminal 2 (S68). Some portable Internet network information (Server IP, Lease Time, etc.) to be used when the portable Internet network 20 is returned is maintained for a predetermined time. In addition, the user terminal 2 does not perform the lease return procedure of the IP address since the user terminal 2 is not used to release the IP address shared through DHCP and continues to use it after the handoff (VHO) to the mobile communication network 10.

If the user terminal 2 does not receive the call release request message DSD_REQ within a predetermined time after the call setup of the mobile communication network 10 is completed (Tvho_comp expired), the user terminal 2 performs a call release procedure by the user terminal 2 The call of the portable Internet network 20 is released. If the mobile terminal does not receive the call release response message DSD_RSP from the ACR 24 due to out of the area of the mobile internet network 20 or for some other reason, the user terminal 2 performs the release procedure and the call of the mobile internet network 20 is received. Clear (S70).

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 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.

When the user terminal 2 of the data service (S80) in the mobile communication network 10 determines to return to the portable Internet network 20 (VHO), the mobile terminal 10 maintains the connection with the mobile communication network 10. The mobile terminal 20 attempts to connect to the portable Internet network 20 in step S82. That is, the user terminal 2 acquires synchronization and downlink parameters, obtains uplink parameters, and ranging. And initializing a radio link initial access procedure such as adjusting an uplink parameter.

The user terminal 2 negotiates basic functions such as IP version, authentication policy, and support capability of the terminal in the physical layer.

The ACR 24 interoperates with the AAA 46 server to perform authentication procedures such as security association, authentication key exchange, security key exchange, and EAP TLS procedure with the user terminal 2 (S86).

The user terminal 2 transmits and registers capability information and vendor characteristic information of a terminal usable in the RAS 22 in a registration request message REG_REQ including ARQ, IP management mode, IP version information, vendor ID information, and the like. Perform the procedure. In this case, the registration request message REG-REQ transmitted by the user terminal 2 should include information for informing the handoff VHO from the mobile communication network 10. For this purpose, source network information, anchor network information, and IMSI information of the user terminal 2 are delivered using the vendor characteristic information field of the existing message. When the ACR 24 transfers the registration request message (REG-REQ) information received from the user terminal 2 to the IWU 30, the VHO network information and IMSI of the user terminal, which are added for handoff (VHO) processing, are transmitted. Must also be communicated. The ACR 24 transmits the capability information and the IP version information of the available terminal to perform the registration procedure (REG_RSP).

The user terminal 2 maintains an existing IP address without being assigned a new IP address. When the user terminal requests IP sharing through DHCP, the user terminal requests (DHCPDISCOVER) the IP address assignment that the terminal has been using in the previous network. The ACR 24 allocates the requested IP address and transmits a DHCPOFFER message (S90).

When the user terminal 2 receiving the DHCPOFFER message uses an existing IP address from the ACR 24, the user terminal 2 transmits a DHCPREQUEST message including the existing IP address and the IP address of the DHCP server proposing the IP. RAS / ACR (22, 24) transmits DHCPRESPONSE message including server host name, IP address sharing time, DNS information, gateway information and option information requested by parameter request list to user terminal (2) for initial IP address assignment process. When the process is completed, the traffic setting procedure between the user terminal 2 and the ACR 24 is completed.

The user terminal 2 performs data transmission through the portable Internet network 20 instead of the mobile communication network 10 from the time point at which the traffic setting procedure with the ACR 24 is completed (S94). In case of a return call of VHO), when the traffic setting is reported from RAS 22, the routing path is updated from IWU (30)-ACR (24)-IP network to RAS (22)-ACR (24)-IP network. (S96)

The VHO call is a return call when the anchor network information in the REG-REQ message is "mobile internet network" and the source network information is "mobile network". Accordingly, the ACR 24 transmits the P-P RUD21 message including the return call information to the IWU 30 to release the call connected to the mobile communication network 10. In addition, the IWU 30 receiving the AI Registration Update message (AI RUD) initiates a call release procedure with the mobile communication network 10, and recognizes the AI registration, which is a response message to the AI Registration Update message (AI RUD). A message (AI RAK: Registration Acknowledgment) is sent to the ACR 24. (S98)

The IWU 30 determines whether there is an existing call with the PDSN 42 by using the IMSI value of the handoff call as a key, and if there is an existing connection, the IWU 30 releases the PPP session with the user terminal 2. In order to transmit the LCP termination request message (LCP Term_Req: Terminate Request) is transmitted (S100).

The user terminal 2 responds with an LCP Termination Acknowledgment Message (LCP Term_Ack: Terminate Acknowledgement) and clears the PPP session (S102).

The IWU 30 determines whether there is an existing call with the PDSN 42 by using the IMSI value of the VHO call as a key, and when there is an existing connection, the L2TP session release process (CDN, ZLB_ACK) to release the L2TP connection with the PDSN 42. Process (S104).

The IWU 30 performs an L2TP control connection procedure with the PDSN 42 through a Stop-Control-Connection-Notification (ZCC_ACK) message (S106).

After releasing the L2TP connection, the PDSN 42 releases the RP connection associated with the PCF 16 in the mobile communication network 10 for the VHO generated call (A11 Regist Update, A11 Regist Ack, A11 RRQ, A11 RRP). (S108)

The PCF 16 sends the BSSs 12 and 14 to release (Disconnet_A8, CDMA200 Channel Release) the call of the mobile communication network 10 of the user terminal 2 in which the handoff to the portable Internet network 20 has occurred. Notify (S110)

If the user terminal 2 does not receive a call release request from the BSS 12 and 14 within a predetermined time after the call setup of the portable Internet network 20 is completed (Tvho_comp expired), the user terminal 2 establishes a PPP session. After the LCP termination request message is sent to the IWU 30 to release, and the IWU 30 responds with an LCP termination acknowledgment message and clears the PPP session, steps S104 and S106, S108, and S110 are performed. If the IWU 30 does not respond to the LCP termination request message sent by the user terminal 2, the PCF 16 releases the RP connection with the PDSN 42 and clears the call of the mobile communication network 10. (S112)

5 is a view sequentially showing a call origination process of the mobile communication network in the interworking system between the mobile communication network and the portable Internet network 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 user terminal 2 attempts to (orgination) the BSS (12, 14) for the packet data service (S200).

The user terminal 2 proceeds with the traffic channel setup process with the BSSs 12 and 14, and transmits an A9 setup message (A9_Setup) to the PCF 16 to set up the A8 interface and performs the step S204. The A9 connection message A9_Connect is transmitted to the BSSs 12 and 14 (S202).

The PCF 14 establishes an RP connection by sending an A11 registration request message (A11 RRQ) to the PDSN 42 and receiving an A11 registration response message (A11 RRP) including an acknowledgment code in response. (S204)

The user terminal 2 and the PDSN 42 negotiate options for the link layer through an LCP formation request message (PPP LCP Conf-Req) and a response message (PPP LCP Conf_Ack) to set up a data link layer (S206). At this time, the user terminal 2 proceeds to the PPP setting procedure with the PDSN (42).

The user terminal 2 proceeds with the authentication process by transmitting the PDSN 42, the CHAP Challenge message, and the CHAP Response message (S208). At this time, the user ID registered to be able to access the PDSN 42 by NAI for authentication. Use

The PDSN 42 transmits an access request message (Access_Req) and an access response (Access_Rsp) message to the AAA 46 server and the user terminal 2 using the NAI that the user terminal 2 attempts to access to proceed with the authentication procedure. (S210)

The PDSN 42 sends a CHAP Success message (CHAP Success) to the user terminal 2 to notify that authentication is successful (S212).

One of the IP pools held by the PDSN 42 is selected and assigned to the user terminal 2 through the IPCP process (IPCP Conf_Req, IPCP Conf_Ack). (S214) At this time, the user terminal 2 Sets the IP header compression option to OFF during PPP negotiation.

Traffic data transmission and reception for the packet data service is performed through the user terminal 2-the BSSs 12 and 14-the PCF 16-the PDSN 42-the IP network / traffic server (S216).

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 according to the present invention. 1 and 6, the interworking system between the mobile communication network and the portable Internet network according to the present invention proceeds to the handoff process from the mobile communication network to the portable Internet network as follows.

The user terminal 2 serving the traffic data service in the mobile communication network 10 determines a handoff (VHO) to the portable Internet network 20 (S220).

The user terminal 2 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 user terminal 2 negotiates basic functions such as an IP version, an authentication policy, and support capabilities 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 user terminal 2 in cooperation with the AAA 46 (S226).

The user terminal 2 registers the 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. The registration procedure is performed by transmitting the response message (REG_RSP) (S228). In this case, the REG-REQ message transmitted by the user terminal 2 includes information for notifying handoff (VHO) from the mobile communication network 10. Should be. To this end, source network information, anchor network information, and IMSI information of a user terminal are transmitted using a vendor characteristic information field of an existing REG-REQ message.

The user terminal 2 maintains an existing IP address without being assigned a new IP address. When the user terminal 2 requests for IP sharing through DHCP, the user terminal 2 sends a DHCPDISCOVER message including the IP address and IP address sharing time (using the determined value) requested for the IP address allocation that the user terminal 2 was assigned and used in the previous network. Send to start the IP activation process. The ACR 24 receiving the DHCPDISCOVER message transmits a DHCPOFFER message and allocates the requested IP address as it is (S230).

The user terminal 2 transmits a DHCPREQUEST message and sends a DHCPREQUEST message to the ACR 24 to use the assigned IP address. Upon receiving a DHCPREQUEST message from the user terminal 2 indicating the use of the requested IP address, the ACR 24 sends a DHCPRESPONSE message including the server host name, DNS information, gateway information and option information requested by the parameter request list. ) To complete the IP address activation process (S232).

The traffic setting procedure between the user terminal 2 and the ACR 24 sets a time, transmits a parameter in use, and establishes a traffic establishment process of the prepared connection setting (S234).

This call is a VHO call from the mobile communication network 10 when both the anchor network and the source network information in the vendor characteristic information of the registration request are " mobile communication network. &Quot; Accordingly, the ACR 24 transmits an AI registration request message (AI RRQ) including the VHO call information and the IP address assigned to the user terminal 2 to the IWU 30 so that the mobile communication network 10 and the IWU 30 can receive the VHO call. Allow the call to be handled. After receiving the A-I registration request message, the IWU 30 attempts to establish an R-P connection with the PDSN 42. The IWU 30 maintains a list of PDSNs 42 such as the PCF 16 of the public, and establishes an RP connection with the PDSN 42 selected by the PDSN selection algorithm using the IMSI value of the user terminal 2 as a key. Transmits an A11 registration request message (A11-RRQ). The PDSN 42 responds with an A11 Registration Response message (A11-RRP) that the R-P connection establishment with the IWU 30 has been completed. At this time, the IWU 30 should be registered as a serviceable PCF 16 list in the PDSN 42 (S236).

The PDSN 42 recognizes the R-P connection request from the IWU 30 as a handoff between the PCFs 16, grants a new R-P connection with the IWU 30, and releases the existing R-P connection. The A11 Regist Update message is transmitted to the existing mobile communication network 10 PCF 16 and the RP connection with the existing PCF 16 is released. (S238) The IWU 30 also sends a PDSN (42). Send an AI registration response message to inform the ACR 24 that the RP connection establishment with the. Upon receiving the response, the ACR 24 updates the traffic routing information to the RAS 22-ACR 24-IWU 30 in the RAS 22-ACR 24-IP network.

The IWU 30 does not reconfigure the PSN with the PDSN 42 but uses the user terminal IP information received from the ACR 24 to perform a PPP proxy with the PDSN 42 (S240). 2)-RAS 22-ACR 24-IWU 30-Traffic data transmission and reception for packet data service is performed through PDSN 42, and PDSN 42 receives the packet received from ACR 24. The PPP packet is converted into a PPP packet in a receivable form and transmitted to the PDSN 42. The PPP packet received from the PDSN 42 is converted into a packet in a form receivable by the ACR 24 and transmitted.

The PCF 16 notifies the BSSs 12 and 14 so as to release the mobile communication network 10 side call of the user terminal 2 in which the VHO to the portable Internet network 20 has occurred, and transmits an A11 registration response message. )

The R-P connection release procedure with the PCF 16 proceeds (S244).

The BSSs 12 and 14 perform a call release procedure with the user terminal 2 in the dual mode to clear the call on the mobile communication network 10 side of the user terminal 2.

If the user terminal 2 does not receive a call release request within a predetermined time after completing the call setup of the mobile Internet network 20 (Tvho_comp expired), the user terminal 2 performs a call release procedure by the mobile terminal 10 by the user terminal 2. To perform. The radio resource is released and the R-P connection is released to release the call of the mobile communication network 10. If the mobile terminal 10 fails to receive the call release response from the BSS 12 or 14 due to the mobile communication network 10 or other reasons, the user terminal 2 performs its own call release procedure and clears the mobile communication network 10 call. (S246)

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 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 user terminal 2 of the traffic data service (S250) determines the VHO to the mobile communication network 10 in the portable internet network 20, the user terminal 2 maintains the call in the portable internet network 20. While attempting to connect to the BSS (12, 14) of the mobile communication network (10) (S252).

The BSSs 12 and 14 proceed with the traffic setup process and transmit an A9 setup message to the PCF 16 to establish an A8 connection (S254).

PCF 16 establishes an R-P connection by sending an A11 registration request message to PDSN 42 and receiving an A11 registration response message containing an authorization code in response. The PDSN 42 allows a new R-P connection establishment with an Inter-PCF handoff process (S256).

Since the PPP fine line of the dual mode user terminal 2 is null, the user terminal 2 attempts a PPP setting procedure with the PDSN 42. (S258, S260) The user terminal 2 and the PDSN ( 42) negotiates options for the link layer through an LCP establishment request and a response message (PPP LCP Conf_Req and PPP LCP Conf_Ack) to set the data link layer (S258).

The user terminal 2 performs an authentication process with the PDSN 42 and uses a user ID registered to be able to access the PDSN 42 as an NAI for authentication (S260).

The PDSN 42 assigns the IP address used by the user terminal 2 to the user terminal 2 through the IPCP process (S262).

The IWU 30 sends an AI registration update message to the ACR 24 to request to release the call of the user terminal 2 connected to the portable Internet network 20, and the ACR 24 responds with an AI registration recognition message thereto. (S264)

The ACR 24 transmits a call release request message (AI RUD) to the user terminal 2 in order to release the call on the portable Internet network 20 of the user terminal 2 on which the VHO to the mobile communication network 10 has occurred. . In response to the call release request from the user terminal 2 (A-I RAK), and after performing the release procedure, the mobile Internet network 20 side call of the user terminal 2 in the dual mode is cleared (S266).

If the user terminal 2 does not receive a call release request within a predetermined time after completing the call setup of the mobile communication network 10 (Tvho_comp expired), the call release request message (DSD_REQ) to release the call by the user terminal 2 ) And release the call of the portable Internet network 20 by receiving the response message (DSD_RSP) (S268).

If the call release response is not received from the ACR 24 due to the mobile internet network 20 being out of the area or for another reason, the user terminal 2 performs the release procedure (DSD_RSP) and clears the call of the mobile Internet network. (S270)

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.

On the other hand, the present invention is not limited to the above-described embodiment, various modifications are possible by those skilled in the art within the spirit and scope of the present invention described in the claims to be described later.

Claims (14)

In a method of interworking a mobile communication network and a portable Internet network, Attempting to access a base station of the mobile communication network when the mobile terminal requests a handoff from the user terminal in the traffic data service to the mobile communication network; Setting up a traffic channel with the user terminal at the base station and establishing an interface connection between the mobile communication network and a core network connected to the Internet network; Setting a data link layer at a serving node of the core network at the user terminal; In the interworking device between the portable internet network and the core network, informing a handoff from the portable internet network by searching for a router that the user terminal has accessed from the portable internet network; Allocating an IP address received from the router to the user terminal in the companion device; The user terminal assigning an IP for a traffic transmission path from the portable Internet network to the mobile communication network to a serving node of the core network using the IP address; Updating the changed traffic routing information in the router by the companion device; Setting up a call to the mobile communication in the user terminal and transmitting and receiving traffic data through the core network, a companion device, a router of a portable Internet network, and the Internet; Releasing the call from the portable internet network at the user terminal; Interworking method between a mobile communication network and a portable Internet network comprising a. The method of claim 1, The method, And after the call of the portable internet network is released, the portable internet network information is maintained for a predetermined time. The method of claim 1, The step of releasing the call of the portable Internet network, the mobile communication network and the mobile Internet network interworking method, characterized in that performed in response to the request to release the call of the portable Internet network to the user terminal. The method of claim 1, The step of releasing the call of the portable Internet network is performed when the request for releasing the call for a predetermined time after setting up the call of the mobile communication network is performed. The method of claim 1, The method, After the user terminal establishes a data link layer at a serving node of the core network, Performing an authentication process in the user terminal using information using a server host name received from the router to a serving node of the core network; Transmitting information including IP information of the companion device to a serving node of the core network by an authentication server of the core network; Performing an L2TP tunnel authentication procedure with the companion device at the serving node of the core network; Interworking method between a mobile communication network and a portable Internet network, characterized in that it further comprises. In a method of interworking a mobile communication network and a portable Internet network, When the user terminal requesting the return to the portable internet network from the mobile communication network requests traffic to the portable internet network, attempting to access the portable internet network while maintaining the connection with the mobile communication network; , Requesting a registration from the user terminal to a router of the portable internet network, and performing a registration procedure based on information of the terminal at the router; Sharing the IP address through the router in the user terminal to complete a traffic setting procedure between the user terminal and the router; Performing traffic data transmission between the user terminal and the router and updating a routing path to the portable internet network and the internet network at the router; Releasing the call of the mobile communication network in the companion device between the portable internet network and the core network and releasing an interface connection between the serving node of the core network and the mobile communication network in the companion device; Releasing the mobile communication network call of the user terminal in which the handoff has occurred in the mobile communication network and setting up a call between the user terminal and the portable internet network. Interworking method between a mobile communication network and a portable Internet network comprising a. The method of claim 6, The method, After establishing a call between the user terminal and the portable internet network, disconnecting an interface connection with the companion device when the user terminal does not receive a call release request from a base station for a predetermined time. A method of interworking between a mobile communication network and a portable internet network. The method of claim 6, The step of releasing the call of the mobile communication network to the companion device between the portable Internet network and the core network, And releasing the call of the mobile communication network from the router to the companion device between the portable internet network and the core network. In a method of interworking a mobile communication network and a portable Internet network, Attempting to connect to a router of the portable Internet network when a user terminal requesting handoff from the mobile data network to the portable Internet network; Setting up an interface connection with a serving node of the core network in the interworking device between the mobile internet network and the core network connected to the internet network in the router; Disconnecting an existing interface from a serving node of the core network and granting a new interface of the companion device; Updating, by the router, the traffic routing path to the companion device; Performing the role of PPP proxy in the serving node of the core network to transmit and receive traffic data through the serving terminal of the user terminal, portable Internet network, companion device and core network; Releasing a mobile communication network side call of the user terminal in the portable internet network and completing call setup between the user terminal and the portable internet network; Interworking method between a mobile communication network and a portable Internet network comprising a. The method of claim 9, The method, And after the user terminal releases the call of the mobile communication network, maintains the mobile communication network information for a predetermined time. The method of claim 9, The step of releasing the call of the mobile communication network, the base station of the mobile communication network in response to the request for releasing the call of the mobile communication network to the user terminal, the interworking method between the mobile communication network and the mobile Internet network. The method of claim 9, The step of releasing the call of the mobile communication network is performed when the request for releasing the call for a predetermined time after setting up the call of the portable internet network is performed. In a method of interworking a mobile communication network and a portable Internet network, Attempting to access a base station of the mobile communication network while maintaining a call of the mobile internet when the user terminal requesting handoff to the mobile communication network from the mobile internet network requests a handoff to the mobile communication network; Performing a traffic setting process at the base station, and connecting an interface to a serving node of a core network connected to the Internet in the mobile communication network; Setting a data link layer through a PPP configuration procedure with a serving node of the core network in the user terminal; Allocating an IP address used by the user terminal in the serving node of the core network; Requesting the router of the portable internet network to release a call of the user terminal from a companion device between the portable internet network and a core network connected to the internet network; Releasing the call from the portable Internet network at the request of the router and setting up a call between the user terminal and the mobile communication network. Interworking method between a mobile communication network and a portable Internet network comprising a. The method of claim 13, The step of releasing the call of the mobile Internet network, And performing a call release request from the router for a predetermined time period.

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