KR20060119519A - Method for operating network link with mobile telecommunication and wireless broadband internet - Google Patents

Abstract

A network interworking method between mobile communication and portable Internet is provided to be capable of performing handoff between a mobile communication network and the portable Internet by using an L2TP(Layer2 Tunneling Protocol) interface, thus data loss and delay time can be reduced. An MS(Mobile Station)(1) attempts to connect with a mobile communication network after releasing a radio access network of the portable Internet(S300). A PCF(Point Coordination Function)(12) sets an R-P connection with a PDSN(Packet Data Service Node)(52)(S304), and informs a BSS(Base Station System)(14) that an A8 connection is established(S306). The MS(1) progresses a PPP(Point to Point Protocol) setup procedure with the PDSN(52)(S308). When authentication is requested to an AAA(Authentication, Authorization, Accounting) unit(34), the PDSN(52) transmits realm information received from the MS(1)(S310). The AAA unit(34) transmits information of an IWU(Inter Working Unit)(54) to the PDSN(52)(S312), and forms an L2TP tunnel with the IWU(54)(S314). The IWU(54) informs an ACR(Access Controller Router)(22) that handoff occurs from the portable Internet(S318), and allocates IP(Internet Protocol) information assigned to the MS(1) to the MS(1)(S322). A traffic transceiving process is performed(S324).

Description

METHOD FOR OPERATING NETWORK LINK WITH MOBILE TELECOMMUNICATION AND WIRELESS BROADBAND INTERNET}

1 is a block diagram illustrating a connection between a mobile communication network and a portable Internet network for implementing a method according to the present invention;

2 is a flowchart of an outgoing call processing process in a portable Internet network implemented according to an embodiment of the present invention;

3 is a flowchart of a handoff process from a portable Internet network to a mobile communication network according to an embodiment of the present invention;

4 is a flowchart of a handoff return process from a mobile communication network to a portable Internet network implemented according to an embodiment of the present invention;

5 is a flowchart of an outgoing call processing process in a mobile communication network implemented according to another embodiment of the present invention;

6 is a flowchart of a handoff process from a mobile communication network to a portable Internet network according to another embodiment of the present invention;

7 is a flowchart of a handoff return process from a portable Internet network to a mobile communication network implemented according to another embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100: mobile communication network 200: mobile Internet network

300: DCN 400: Internet

10a, 10b: BTS 12: BSC / PCF

14: BSS 20a, 20b: RAS

22: ACR 32: HA

34: AAA 36: Billing Server

52: PDSN 54: IWU

The present invention relates to a system integration technology of a third generation (3G) mobile communication network and a wireless LAN (WLAN) or a portable Internet network, and in particular, effectively supports hand-off between the mobile communication network and the portable Internet network. The present invention relates to a network interworking method between mobile communication and the portable Internet.

Mobile communication network, especially CDMA2000 network, 3rd generation mobile communication, is a form of digital mobile communication service developed to solve the problem of the analog method, which is limited to making only one call at a time. It converts voice, which is a signal, into a digital signal, adds a random number to it, and converts it into several digital codes to communicate. The mobile terminal recognizes only the codes uniquely assigned to the caller's channel. There is an advantage that communication confidentiality is guaranteed.

In addition, the portable Internet refers to a communication service that allows a user to access the Internet at high speed in a mobile environment such as walking or driving a vehicle to enjoy necessary information or entertainment. This is a rising trend. The portable Internet is a data service using wireless in the 2.3 GHz frequency band, and for example, a WLAN or a wireless broadband Internet (WiBro) is a typical portable internet system.

On the other hand, users demand a variety of services that are not available in the form of network, network service providers are trying to meet the needs of users through cheaper and more economical access and network technology.

As a result, a system employing various types of wired / wireless access technologies has emerged, and in particular, the provision of an effective network interworking service between the mobile communication and the mobile Internet has been raised as a major issue. That is, the first part to be handled to provide network interworking services between different access systems is the development of interworking service standards for mobile communication networks (eg, 3rd generation mobile communication) and portable Internet networks (eg, WLAN).

However, these two systems have evolved independently of each other and use different specifications and standards. Therefore, various matters such as architecture, protocol structure, mobility, quality of service, authentication, security, billing, etc. must be considered for interworking each network, and modification and supplementation of each matter must be accompanied.

The third generation-WLAN interworking method can be roughly classified into a loosely coupled and a tightly coupled method.

Loose-coupling allows third-generation networks and WLAN users to independently authenticate each other and maintain billing or mobility support management policies. However, to support seamless communication, it must have one unified user information, and therefore an interaction between two different networks. This requires the use of MIP technology, but the lack of public IP resources is a problem.

On the other hand, the tight coupling scheme has a structure in which the 3G core network and the WLAN are directly integrated. This is a form in which the WLAN is directly connected to the third generation network equipment (GGSN in the case of UMTS, PDSN in the case of CDMA2000), and the WLAN is composed of one third generation access network to the 3G core network. WLAN gateways must implement all third-generation protocols along with Internet protocols, and terminals also implement third-generation protocol stacks with Internet protocol stacks to use both stacks at the same time or to handoff between two networks. It is necessary to change the process.

All data sent by the terminals in the WLAN is sent through the third generation core network. In this way, different networks perform the same processing for authentication, signal strength, transmission, and billing. Since WLAN traffic always uses the 3rd generation core network, it must be designed to handle the increased traffic in network components such as PDSN and GGSN, and because 3rd generation protocol stacks must be implemented on the WLAN interface for all terminals. Significant additional costs are required.

As a result, the above-described loose coupling interworking method has a problem of large data loss and delay time during the handoff process, and the tight coupling interworking method requires traffic re-engineering of the mobile communication network. There is a problem in that integration of the rest of the network except wireless access is necessary.

The present invention is to solve the above-mentioned problems of the prior art, by performing a handoff between the mobile communication network and the portable Internet network using the Layer 2 Tunneling Protocol (L2TP) interface, and the mobile communication that can reduce data loss and delay time; The purpose is to provide a network interworking method between the mobile Internet.

Another object of the present invention is to provide a network interworking system and method between a mobile communication and a mobile Internet capable of individually operating each network while providing seamless mobility to a user based on a simple IP service using an L2TP interface. .

According to an embodiment of the present invention for achieving the above object, a handoff processing method from a portable Internet network to a mobile communication network, when the user terminal in the outgoing call processing in the portable Internet network requests a handoff to the mobile communication network Releasing the wireless access network of the portable Internet network and attempting to access the mobile communication network; and performing a connection setup process in the base station system of the mobile communication network according to the access attempt of the terminal, and then establishes a packet with the base station controller and the packet in the mobile communication network. After establishing a connection between the data service nodes, informing the base station system of the connection setting by the base station controller, and performing a PPP setting procedure between the terminal and the packet data service node, the pseudo realm information is configured and authenticated. Attempting a procedure; Transmitting the obtained realm information from the packet data service node to the authentication / authorization server of the internet network, and transmitting the interworking unit information to form a layer-2 tunneling protocol from the authentication / authorization server to the packet data service node. Transmitting a PPP connection between the packet data service node and the interworking unit, and then performing a PPP connection between the interworking unit and the user terminal; Performing an authentication process between the terminal and the interworking unit using realm information configured using a server domain of an access control router of an internet network, and notifying the access control router of a handoff occurrence from the interworking unit And traffic routing information at the access control router. Updating to an access control router and an interworking unit relationship, and assigning the IP information allocated through the portable Internet network to the terminal, the terminal, the base station control system, the base station controller, the packet data service node, and the inter It provides a network interworking method between the mobile unit and the mobile Internet, including the step of transmitting and receiving traffic data through a working unit, the access control router.

According to another embodiment for achieving the object of the present invention, a handoff return processing method from a mobile communication network to a mobile Internet network, when the user terminal in the outgoing call processing in the mobile communication network requests a handoff to the portable Internet network Releasing the wireless access network of the portable internet network and attempting to access the mobile communication network; negotiating basic functions of the terminal; and authentication / authorization server of the wireless access station and the internet network of the portable internet network. Performing the authentication procedure of the terminal in association with each other, transmitting the acceptance information and vendor detailed information of the terminal available in the wireless access station to the access control router of the portable Internet network, and performing the registration procedure; Proceed with establishing a traffic connection between the terminal and the wireless access station And including the terminal information received from the terminal in a registration request message and transmitting the terminal information to the interworking unit through the access control router, and registering from the interworking unit to the access control router according to the registration request message. Transmitting a response message, updating traffic routing information to the radio access station, the access control router, and the interworking unit relationship according to the registration response message, and packet data selected by a packet data service node selection algorithm; Establishing a layer-2 tunneling protocol with a service node, and establishing a PPP connection with the packet data service node using a user ID received from the terminal, wherein the terminal, the wireless access station, the access control router, and the inter Walking Unit, And it provides the packet data service, the mobile comprising: receiving the traffic data for the packet data service node through the communication with the network interface between the portable Internet method.

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

Prior to the description, the key technical gist of the present invention is to use the L2TP tunnel so that the two networks can be operated independently of each other while accepting the advantages of the loose coupling interlocking scheme and the tight coupling interlocking scheme. It will be easy to achieve what the purpose of the invention is.

In addition, although a CDMA2000 network is used as a mobile communication network and a WiBro is applied as a mobile communication network, this is merely illustrative for convenience of description, and the interworking structure and call progress described in the present invention may be described. It is not limited to these network structures. For example, since WiBro or similar portable Internet networks have a structure similar to that of WLAN, the present invention is not limited to a system such as WLAN or WiBro, but is applicable to any system that can transmit and receive IP or Ethernet packets wirelessly. This is possible.

1 is a block diagram of a network interworking system between a mobile communication and a portable Internet according to an embodiment of the present invention, the terminal 1, the mobile communication network 100, the portable Internet network 200, DCN (data communication network) A Data Communication Network (300), the Internet 400, a Packet Data Service Node (PDSN) 52, and an Inter Working Unit 54 (IWU).

Prior to the detailed description of FIG. 1, the present embodiment is characterized in that the IWU (Vertical Handoff) in the case of a vertical handoff from the mobile communication network 100, for example, the CDMA2000 network, to the portable Internet network 200, for example, the WiBro network, may be used. 54) operates as a L2TP Access Concentrator (LAC) for the PDSN (LNS; L2TP Network Server) 52, and the IWU 54 receives the PDSN during the vertical handoff from the WiBro network 200 to the CDMA2000 network 100. (LAC) 52 to operate as LNS, but IWU 54 terminates the PPP (Point-to Point Protocol) connection with PDSN 52 on behalf of UE 1 To provide a PPP proxy function.

As shown in FIG. 1, the mobile communication network 100, that is, the CDMA2000 network, includes a base station transceiver system (BTS) 10a (10b), a base station controller (BSC) / point coordination function (PCF) 12. A base station system (BSS) 14 is included.

Here, the BTSs 10a and 10b represent a base station, and provide a wireless communication service to a subscriber by interfacing a mobile station, that is, a terminal 1 with a wireless connection according to the IS-2000 standard. At this time, it is limited to the two BTS (10a) (10b) in the drawing, but this is for convenience of description, it will be readily known to those skilled in the art that a number of BTS can be formed in the actual BSS (14).

In the BSC / PCF 12, the BSC represents a base station controller, which is located between the MSC (Mobile Switching Center) and the BTSs 10a and 10b, which are not shown, to the Internet 400 through the PDSN 52. Performs a vocoding function on the voice. PCF follows a non-competitive frame transmission scheme.

The mobile communication network 100 is connected to the PDSN 52 which is a packet data service node. The PDSN 52 is a synchronous CDMA packet data exchange system that is an essential equipment for providing wireless data services in the mobile communication network 100. The PDSN 52 is an essential equipment for providing CDMA2000-1x, 1xEV-DO and more high-speed wireless Internet services. .

The portable Internet network 200 includes a RAS (Radio Access Station) 20a (20b) and an ACR (Access Controller Router) 22.

Here RAS (20a) (20b) is a component that transmits and receives with the terminal 1 through the air interface at the wired network end. Like the above-described BTS (10a) (10b) can be formed a plurality of RAS (20a) (20b).

The ACR 22 is a component that controls the terminal 1 and the RAS 20a and 20b and routes IP packets. At this time, the ACR 22 delivers the packet to the IWU 54 during the vertical handoff according to the present embodiment.

The IWU 54 is a means for interconnecting the ACR 22 and the PDSN 52 described above, and the IWU 54 interworks between different heterogeneous networks (interworking between the mobile communication network 100 and the mobile Internet network 200). The interface interworking between devices of different standard used in each network is performed. The IWU 54 performs a corresponding operation by determining whether the request is a vertical handoff request and a return call after the vertical handoff according to the present embodiment, and provides a PPP termination function instead of the terminal 1 for the CDMA network using PPP. Perform. In addition, it performs the role of LNS and LAC for establishing the L2TP tunnel.

By the operation of the IWU 54 it is possible to implement the interworking of the WiBro network 200 and the CDMA network 100 without modification of the PCF and PDSN. That is, since the present embodiment supports both the LNS and LAC functions in the IWU 54 and the PDSN 52, the terminal 1 transmits the user ID information and the network information connected to the packet network in the CDMA2000 network. ) Can be sent. In addition, the IWU 54 sets up the PDSN 52 and the L2TP using this information, and then sets up the PPP with the PDSN 52 instead of the terminal 1 to serve as a PPP proxy.

On the other hand, the DCN 300 / Internet 400 is connected to the mobile communication network 100 and the portable Internet network 200, HA (Home Agent; Home Agent) 32, AAA (authentication / authorization / billing; Authentication) , Authorization, Accounting) server 34, and the billing server 36.

The HA 32 is a home agent and is a network component that supports IP mobility of the terminal 1 in a home network.

The AAA 34 is a network component that performs authentication, authority verification, and charging for the user and the terminal 1 to provide a service and access to the portable Internet network 200 only for a legitimate user.

Hereinafter, an operation process of the network interworking system between the mobile communication and the portable internet will be described.

First, when the terminal 1 first accesses the CDMA network 100, the packet is transmitted in the path of BTS 10a → BSC 12 → PCF → PDSN 52 → DCN 300 / Internet 400. When the terminal 1 first accesses the WiBro network 200, a packet is transmitted to the path of RAS 20a → ACR 22 → DCN 300 / Internet 400.

When the terminal 1, which has been serviced by such a path, moves to the WiBro network 200, first, the terminal 1 attempts to connect to the WiBro network 200. However, when the terminal 1 attempts to access the WiBro, the terminal 1 is transferred from the CDMA network 100 and informs the WiBro network 200 of MIN information and PPP information necessary for interworking.

The ACR 22 of the WiBro network 200 that has received the information requests the IWU 54 to start the L2TP tunnel setup with the PDSN 52 through the interface with the IWU 54. The IWU 54 receiving the request establishes an L2TP tunnel to the PDNS 52 serving as the LNS as the LAC.

When this process is completed, even if the terminal 1 moves from the CDMA network 100 to the WiBro network 200, the DCN 300 / Internet 400 → PDSN 52 → IWU 54 → ACR 22 → RAS A packet can be sent and received via the path of 20a.

When the terminal 1 serviced by such a path moves to the CDMA network 100, the terminal 1 first starts a CDMA access procedure. However, for interworking between the WiBro network 200 and the CDMA network 100, the terminal 1 configures the WiBro network 200 information obtained from the WiBro network 200 as a realm of the NAI, and then uses the PDSN 52. Sent during PPP authentication with). The PDSN 52 may select the ACR 22 and the IWU 54 of the WiBro network 200 to which the terminal 1 has previously connected based on the realm information transmitted from the terminal 1, and based on this, the PDSN 52 52 establishes an L2TP tunnel to the IWU serving as the LNS as the LAC.

When this process is finished, the IWU 54 requests the ACR 22 to change the packet transmission path to the IWU 54 instead of the RAS 20a through the interface with the ACR 22. 1) Even though the WiBro network 200 moved from the CDMA network 100 to the DCN 300 / Internet 400 → ACR 22 → IWU 54 → PDSN 52 52 PCF 12 BSC BTS In the path of 10a, a packet can be received without interruption of service.

Hereinafter, the network interworking process performed in the network interworking system between the mobile communication and the portable Internet will be described in more detail with reference to the flowcharts of FIGS. 2 to 7.

2 is a flowchart illustrating an outgoing call processing procedure in a portable Internet network 200, for example, a WiBro network.

As shown in FIG. 2, in step S200, the terminal 1 performs a radio link initial access procedure such as synchronization and downlink parameter acquisition, uplink parameter acquisition, ranging and uplink parameter adjustment.

Subsequently, in step S202, basic functions such as an IP version, an authentication policy, and a supporting capability of the terminal 1 in the physical layer are negotiated.

In step S204, the RAS 20a performs an authentication procedure such as security association, security key exchange, security key exchange, and EAP TLS procedure with the terminal 1 in association with the AAA 34.

In step S206, the terminal 1 can be used in the RAS (20a) for the registration request including the ARQ (Automatic Repeat reQuest), IP management mode, IP version information, vendor ID information, etc. The capability information and the vendor detailed information of the B are transmitted to the ACR 22 to perform a registration procedure.

In step S208, an IP to be used in the terminal 1 is allocated according to the IP allocation method.

Subsequently, in step S210, a process of establishing a traffic connection between the terminal 1 and the RAS 20a is performed.

Therefore, as in step S212, traffic data transmission and reception is performed between the terminal 1-RAS 20a-ACR 22.

3 is a flowchart illustrating a vertical handoff processing procedure from a portable Internet network 200 to a mobile communication network 100, for example, a CDMA2000 network.

First, in step S300, the terminal 1 releases the wireless access network of the portable internet network 200 and attempts to access the mobile communication network 100.

When the connection attempt of the terminal 1 is made, the BSS 14 transmits A9_Setup_A8 to the PCF 12 to establish an A8 connection as in step S302.

In step S304, the PCF 12 establishes an R-P connection with the PDSN 52.

If the R-P connection with the PDSN 52 is established, the PCF 12 informs the BSS 14 that the A8 connection has been established, as in step S306.

In step S308, the terminal 1 proceeds to a PPP setting procedure with the PDSN 52, and in the authentication process, the terminal 1 establishes DHCP with the ACR 22 in the portable Internet network 200. Pseudo realm information is constructed using server domain and user ID information received from the server, and authentication is attempted using the real realm information.

In step S310, the PDSN 52 transmits the realm information received from the terminal 1 to the AAA 34 when the authentication request is made. In this case, the server domain included in the realm information is registered as a server domain capable of L2TP, and IWU information for forming an L2TP tunnel should be registered for the domain.

In step S312, the AAA 34 transmits the information of the IWU 54 to form the L2TP tunnel to the PDSN 52.

The PDSN 52 then forms an L2TP tunnel with the IWU 54 and transmits the LCP information negotiated with the terminal 1 to the IWU 54 as in step S314. Thereafter, the IWU (LNS) 54 performs a PPP connection with the terminal 1.

In step S316, the terminal 1 proceeds again from the authentication step with the IWU 54, and at this time, the real ID configured using the user ID and the server domain of the ACR 22 is used.

Thereafter, in step S318, the IWU 54 has the server domain and IP information of each ACR 22, and looks up the ACR corresponding to the server domain included in the realm information received from the terminal 1. up) and transmit a PP registration request message to the ACR to notify the ACR 22 that a handoff from the portable Internet network 200 has occurred.

Then, the ACR 22 transmits the terminal information allocated in the portable Internet network 200 through the PP registration response as in step S320, and transmits the traffic routing information in the ACR 22-RAS 20a relationship. 22)-Update to the IWU 54 relationship.

Therefore, the IWU 54 receives the IP information allocated to the terminal 1 in the portable Internet network 200 from the ACR 22 as in step S322 and assigns the same IP to the terminal 1 during the IPCP process. do.

Due to this result, in step S324, traffic is transmitted and received between the terminal 1-BSS 14-PCF 12-PDSN 52-IWU 54-ACR 22, and the IWU 54 Converts the PPP packet received from the terminal 1 into a packet that can be processed by the ACR 22 and transmits it to the ACR 22, converts the packet received from the ACR 22 into the PPP form, and transmits the packet to the terminal 1; do.

4 is a flowchart illustrating a vertical handoff return processing procedure from the mobile communication network 100 to the portable internet network 200.

First, in step S400, the user terminal 1 performs a radio link initial access procedure such as synchronization and downlink parameter acquisition, uplink parameter acquisition, ranging and uplink parameter adjustment.

Subsequently, in step S402, basic functions such as an IP version, an authentication policy, and a supporting capability of the terminal 1 in the physical layer are negotiated.

In step S404, the RAS 20a performs an authentication procedure such as security association, security key exchange, security key exchange, and EAP TLS procedure with the terminal 1 in association with the AAA 34.

In step S406, the terminal 1 accepts information of the terminal 1 usable in the RAS 20a for a registration request including ARQ, IP management mode, IP version information, vendor ID information, and the like. And the vendor details are transmitted to the ACR 22 to perform the registration procedure. At this time, the terminal 1 notifies the ACR 22 that the handoff from the mobile communication network 100 includes the handoff identifier, the MIN value, and the like in the vendor details field.

In step S408, the terminal 1 maintains the existing IP without receiving a new IP.

Thereafter, in step S410, a process of establishing a traffic connection between the terminal 1 and the RAS 20a is performed.

In step S412, the ACR 22 sends a P-P registration request message to the IWU 54 to indicate that it has been handed off from the mobile communication network 100.

In response to the registration request message, the IWU 54 transmits a P-P registration response message to the ACR 22 including information indicating that the mobile internet network 200 is returned to the portable Internet network 200 as in step S414. Upon receiving the P-P registration response message, the ACR 22 updates the traffic routing information from the ACR 22-IWU 54 relationship to the ACR 22-RAS 20a relationship.

Thereafter, in step S416, the IWU 54 determines whether an existing connection exists with the PDSN 52 using the MIN value of the terminal 1 as a key, and if the existing connection exists, determines that the PDSN ( Perform L2TP tunnel release procedure with 52).

Therefore, as in step S418, traffic data transmission and reception is performed between the terminal 1-RAS 20a-ACR 22.

5 is a flowchart illustrating an outgoing call processing procedure in the mobile communication network 1.

First, in step S500, the terminal 1 attempts to connect to the BSS 14 for packet data service, and proceeds with the traffic setting process with the BSS 14.

When the traffic establishment process with the BSS 14 is made, the BSS 14 transmits A9_Setup_A8 to the PCF 12 to establish an A8 connection as in step S502.

In step S504, the PCF 12 establishes an R-P connection with the PDSN 52.

If the R-P connection with the PDSN 52 is established, the PCF 12 informs the BSS 14 that the A8 connection has been established, as in step S506.

In step S508, the terminal 1 proceeds to the PPP configuration procedure with the PDSN (52).

The PDSN 52 then proceeds with the authentication procedure for the AAA server 34 and the terminal 1 as in step S510.

As a result of this, in step S512, traffic is transmitted and received for the packet data service between the terminal 1-BSS 14-PCF 12-PDSN 52.

6 is a flowchart illustrating a vertical handoff processing procedure from the portable Internet network 200 to the mobile communication network 100.

First, in step S600, the user terminal 1 performs a radio link initial access procedure such as synchronization and downlink parameter acquisition, uplink parameter acquisition, ranging and uplink parameter adjustment.

Thereafter, in step S602, basic functions such as IP version, authentication policy, and support capability of the terminal 1 in the physical layer are negotiated.

In step S604, the RAS 20a performs an authentication procedure such as a security agreement, an authentication key exchange, a security key exchange, and an EAP TLS procedure in association with the AAA 34.

In step S606, the terminal 1 receives the acceptance information and vendor details of the terminal 1 available in the RAS 20a for a registration request including ARQ, IP management mode, IP version information, vendor ID information, and the like. It transmits to ACR 22 and performs a registration procedure. At this time, the terminal 1 should be able to transmit the information indicating that the handoff from the mobile communication network 100 and the information, such as the IP, user ID, password, etc. assigned from the mobile communication network 100 to the portable Internet network 200.

In step S608, the terminal 1 maintains the existing IP without receiving a new IP.

Thereafter, in step S610, a process of establishing a traffic connection between the terminal 1 and the RAS 20a is performed.

In step S612, the ACR 22 transmits the terminal information (IP, user ID, password, and handoff from the mobile communication network 100) received from the terminal 1 to the PP registration request message. And transmit to the IWU 54.

According to this registration request message, the IWU 54 transmits a P-P registration response message to the ACR 22 as in step S614. Upon receiving the PP registration response message, the ACR 22 updates the traffic routing information from the relationship of RAS 20a-ACR 22-Internet 400 to the relationship of RAS 20a-ACR 22-IWU 54. .

Thereafter, in step S616, the IWU 54 maintains a PDSN list such as a public PCF, and if the corresponding call is a handoff call from the mobile communication network 100 and is not a return call to the portable Internet network 200, the PDAN selection. Set the PDSN and L2TP tunnel selected by the algorithm.

In step S618, a PPP connection is established with the PDSN 52 using the user ID received from the terminal 1 or the like.

As a result of this, in step S620, traffic is transmitted and received for packet data service between the terminal 1-RAS 20a-ACR 22-IWU 54-PDSN 52, and ACR 22 Transmits the traffic data received from the terminal 1 to the IWU 54, and the IWU 54 transmits to the PDSN 52 in the form of a PPP packet. In addition, the IWU 54 converts the PPP packet received from the PDSN 52 into data in a form that the ACR 22 can receive and transmits it to the ACR 22.

7 is a flowchart illustrating a vertical handoff return processing procedure from the mobile communication network 100 to the portable internet network 200.

First, in step S700, the terminal 1 attempts to connect to the BSS 14 for packet data service, and performs a traffic setting process with the BSS 14.

When the traffic establishment process with the BSS 14 is made, the BSS 14 transmits A9_Setup_A8 to the PCF 12 to establish an A8 connection as in step S702.

In step S704, the PCF 12 establishes an R-P connection with the PDSN 52.

In step S706 the PDSN 52 releases the L2TP tunnel with the IWU 54.

PCF 12 then informs BSS 14 that the A8 connection has been established, as in step S708.

At this time, as in step S710, the terminal 1 and the PDSN 52 do not reset because the PPP is already set.

As a result of this, in step S712, traffic is transmitted and received for the packet data service between the terminal 1-BSS 14-PCF 12-PDSN 52.

As described above, the present invention uses the L2TP interface to perform handoff between the mobile communication network and the portable Internet network, and provides the user with seamless mobility based on the simple IP service using the L2TP interface.

The embodiments of the present invention have been described in detail above, but the present invention is not limited to these embodiments, and various modifications may be made by those skilled in the art within the spirit and scope of the present invention described in the claims below.

According to the present invention, by implementing the interworking technology between the mobile communication and the portable Internet using the L2TP interface that can reduce the data loss and delay time, it is possible to reduce the data loss and delay time during handoff between the mobile communication network and the portable Internet network. In addition to providing seamless mobility for users, each network can be operated individually.

Claims (14)

A handoff processing method from a mobile internet network to a mobile communication network, Releasing a wireless access network of the portable internet network and attempting to access the mobile communication network when a user terminal requesting a handoff is requested from the portable internet network to the mobile communication network; Setting up a connection between a base station controller and a packet data service node in the mobile communication network by performing a connection setting process in a base station system of the mobile communication network according to an access attempt of the terminal; In the base station controller, notifying the base station system of a connection setting; Attempting an authentication procedure by configuring pseudo realm information after the PPP setting procedure between the terminal and the packet data service node; Transmitting, from the packet data service node, realm information obtained from the terminal to an authentication / authorization server of an internet network; Transmitting the interworking unit information to form a layer-2 tunneling protocol from the authentication / authorization server to the packet data service node; Establishing a layer-2 tunneling protocol between the packet data service node and the interworking unit, and then performing a PPP connection between the interworking unit and the user terminal; Performing an authentication process between the terminal and the interworking unit using realm information configured using the user ID and a server domain of an access control router of the portable Internet network; Notifying the access control router of the handoff occurrence in the interworking unit; Updating traffic routing information in an access control router to an access control router and an interworking unit relationship; Allocating IP information allocated through the portable Internet network to the terminal to transmit and receive traffic data through the terminal, the base station control system, the base station controller, the packet data service node, the interworking unit, and the access control router. step Network interworking method between the mobile communication and the mobile Internet comprising a. The method of claim 1, In the authentication procedure between the terminal and the packet data service node, the network communication between the mobile communication and the portable internet is configured using the server realm and user ID information received from the access control router of the portable internet network. Way. The method of claim 1, The server domain included in the realm information is registered in the authentication / authorization server as a server domain capable of the layer-2 tunneling protocol, and interworking unit information for forming the layer-2 tunneling protocol is provided for the server domain. Network interworking method between the mobile communication and the mobile Internet, characterized in that registered. The method of claim 1, Outgoing call processing of the terminal in the portable Internet network, Performing a radio link initial access procedure at the terminal; Negotiating basic functions of the terminal; Performing an authentication procedure of the terminal by interworking with the wireless access station of the portable Internet network and the authentication / authorization verification server; Transmitting the acceptance information and vendor detailed information of the terminal available at the wireless access station from the terminal to the access control router to perform a registration procedure; Receiving IP information to be used in the terminal; A process of establishing a traffic connection between the terminal and the wireless access station to transmit and receive traffic data through the terminal, the wireless access station, and the access control router. Network interworking method between the mobile communication and the mobile Internet, characterized in that it comprises a. The method of claim 1, The method, Performing a radio link initial access procedure at the terminal; Negotiating basic functions of the terminal; Performing an authentication procedure for the terminal by interworking with the wireless access station and the authentication / authorization server; Transmitting the acceptance information and vendor details of the terminal available at the wireless access station from the terminal to the access control router to perform a registration procedure; A process of establishing a traffic connection between the terminal and the wireless access station; Sending, by the access control router, a registration request message to the interworking unit, notifying that the terminal has been handed off from the mobile communication network; Sending a registration response message from the interworking unit to the access control router according to the registration request message; Updating traffic routing information in the access control router to the access control router and the wireless access station relationship; If there is an existing connection between the terminal and the packet data service node, it is determined to return to the handoff and releases the measurement-2 tunneling protocol with the packet data service node, thereby causing traffic through the terminal, the wireless access station, and the access control router. Sending and receiving data Network interworking method between the mobile communication and the mobile Internet, characterized in that it further comprises. The method of claim 5, The performing of the registration procedure may include transmitting the vendor details field to the access control router to notify that the terminal has been handed off from the mobile communication network. The method of claim 5, The terminal interworking method between the mobile communication and the mobile Internet, characterized in that to maintain the existing IP as it is not newly assigned IP. A method for processing handoff return from a mobile communication network to a portable internet network, Releasing a wireless access network of the portable internet network and attempting to access the mobile communication network when a user terminal requesting handoff from the mobile communication network requests a handoff to the portable internet network; Negotiating basic functions of the terminal; Performing an authentication procedure of the terminal by interworking with the wireless access station of the portable internet network and the authentication / authorization verification server of the internet network; Transmitting registration information and vendor details of a terminal usable in the wireless access station to an access control router of the portable Internet network to perform a registration procedure; A process of establishing a traffic connection between the terminal and the wireless access station; Including the terminal information received from the terminal in a registration request message and transmitting the terminal information to the interworking unit through the access control router; Sending a registration response message from the interworking unit to the access control router according to the registration request message; Updating the traffic routing information to the radio access station, the access control router, and the interworking unit relationship according to the registration response message; Establishing a layer-2 tunneling protocol with the packet data service node selected by the packet data service node selection algorithm; By establishing a PPP connection with the packet data service node using the user ID received from the terminal, the packet data service is provided through the terminal, the wireless access station, the access control router, the interworking unit, and the packet data service node. Sending and receiving traffic data Network interworking method between the mobile communication and the mobile Internet comprising a. The method of claim 8, The performing of the registration procedure may include transmitting information indicating that the terminal is handed off from the mobile communication network, and IP, user ID, and password information allocated from the mobile communication network to the mobile Internet network. Network interworking method between the mobile Internet. The method of claim 8, The terminal interworking method between the mobile communication and the mobile Internet, characterized in that to maintain the existing IP as it is not newly assigned IP. The method of claim 8, The setting of the layer-2 tunneling protocol may be performed when the interworking unit maintains a packet data service node list and the corresponding call is a handoff call from the mobile communication network and not a return call to the portable Internet network. Network interworking method between the mobile communication and the mobile Internet, characterized in that. The method of claim 8, The traffic data transmission and reception step, Transmitting traffic data received from the terminal from the access control router to the interworking unit; Transmitting the traffic data in the form of a PPP packet from the interworking unit to the packet data service node; Converting the PPP packet received from the packet data service node into data of a form receivable at the access control router and transmitting the access control router at the interworking unit; Network interworking method between the mobile communication and the mobile Internet, characterized in that it comprises a. The method of claim 8, Outgoing call processing of the terminal in the mobile communication network, Attempting to access a base station system of the mobile communication network for a packet data service by the terminal and performing a traffic setting process with the base station system; Establishing a connection between the base station controller of the mobile communication network and the packet data service node; Notifying the connection establishment from the base station controller to the base station system and performing the PPP establishment procedure between the terminal and the packet data service node; The packet data service node transmits and receives traffic data for a packet data service through the terminal, the base station system, the base station controller, and the packet data service node by performing an authentication procedure for the authentication / authorization server and the terminal. Steps to Network interworking method between the mobile communication and the mobile Internet, characterized in that it comprises a. The method of claim 8, The method, Attempting to access the base station system for a packet data service from the terminal, and performing a traffic setting process with the base station system; Establishing a connection between the base station controller and the packet data service node; Releasing the layer-2 tunneling protocol with the interworking unit at the packet data service node; Transmitting and receiving traffic data for a packet data service through the terminal, the base station system, the base station controller, and the packet data service node by notifying the base station system that the connection setting is completed from the base station controller; Network interworking method between the mobile communication and the mobile Internet, characterized in that it further comprises.

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