KR100601877B1 - Mobile communication system for interworking between cdma2000 network and portable internet, roaming method thereof - Google Patents

Abstract

A mobile communication system and a roaming method for providing a service between two mobile communication networks continuously in a multi-access system environment in which a CDMA2000 network and a portable Internet coexist.

The mobile communication system of the present invention is connected to a CDMA2000 system, a portable Internet system, a packet data service node and a control station, is connected to a home agent, an authentication center and the Internet, and a dual-band dual-mode mobile communication terminal is a CDMA2000 system or a portable Internet. An authentication broker for interfacing authentication of the mobile communication terminal in connection with the authentication center, a first tunneling processing unit for establishing and managing a tunnel for transmitting and receiving data to the mobile communication terminal connected to the CDMA2000 system, and a portable Internet system. An IP allocator and an IP allocator for allocating an IP address to a mobile communication terminal connected through a CDMA2000 system or a portable Internet system, and a second tunneling processing unit for establishing and managing a tunnel for transmitting and receiving data to and from a connected mobile communication terminal. Dual-band dual-mode mobile communication terminal and CDMA2 with reference to one IP address An interworking device having a routing processing unit for routing packet data between 000 systems or portable Internet systems.

CDMA2000, Mobile Internet, Interworking, Roaming

Description

Mobile Communication System for Interworking between CDM2000 Network and Portable Internet and Roaming Method in the System {Mobile Communication System for Interworking Between CDMA2000 Network and Portable Internet, Roaming Method Thereof}

1 is a configuration diagram of a general CDMA2000 system;

2 is a configuration diagram of a general portable Internet system;

3 is a block diagram of a mobile communication system according to the present invention;

4 is a detailed configuration diagram of the interlocking device shown in FIG. 3;

5 is a flowchart illustrating a roaming method according to an embodiment of the present invention;

6 is a flowchart illustrating a roaming method according to another embodiment of the present invention.

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

10: CDMA2000 System 20: Portable Internet System

30: interlocking device 40: home agent

50: Certification Center 60: Internet

100: dual band-dual mode mobile communication terminal 110: base station

120: base station controller 130: packet controller

140: packet data service node 210: base station

220: control station 310: control unit

320: authentication broker 330: first tunneling processing unit

340: second tunneling processing unit 350: IP allocation unit

360: routing processing unit 370: communication network interface

The present invention relates to a mobile communication system and a roaming method in the system, and more particularly, to a mobile communication system for continuously providing a service between two mobile communication networks in a multi-access system environment in which a CDMA2000 network and a portable Internet coexist. A method of roaming in a system.

Recently, wireless Internet service using a mobile communication terminal is provided by a communication method such as CDMA 1x EV-DO, WCDMA, and the like, and the demand thereof is increasing. However, the mobile communication terminal has a small screen size and low resolution. However, due to the low data rate, multimedia content is not suitable. In addition, there is a limitation as a general means for accessing the Internet due to the burden on the information usage fee due to the high wireless Internet usage fee.

Overcoming the limitations of the existing system, a service called 'mobile Internet' has been developed as a wireless Internet service that enables high-speed Internet access even when stationary or on the move with high service quality and cost, and is commonly referred to as WiBro. Portable Internet service is defined as a service that enables high-speed wireless Internet access anytime, anywhere, even while stationary and mobile. Currently, the mobile Internet is partially implemented in regions with high service utilization rates, and overlaps with existing CDMA2000 systems.

On the other hand, users demand various services irrespective of network type, and network service providers are trying to satisfy users' needs through cheaper and more economical access and network technology. As a result, the provision of effective interworking services between heterogeneous networks has been raised as a major issue. In particular, it is urgent to develop interworking service standards for CDMA2000 networks and the portable Internet.

However, the CDMA2000 network and the portable Internet have developed independently, and use different standards and standards. Therefore, in order to interwork each network, various matters such as architecture, protocol structure, mobility, quality of service, authentication, security, billing, etc. must be considered, and modification and supplementation of each matter must be accompanied.

1 is a configuration diagram of a general CDMA2000 system.

As shown, the CDMA2000 system includes a base station (BTS.110) for wireless section communication with a mobile communication terminal 100, a base station controller (BSC) 120 for controlling a base station connected to a plurality of base stations, and a base station controller 120 Is connected between the packet controller (PCF) 130, the packet controller 130, and the Internet 60 to perform handover control and management, packet data service profile management of the mobile communication terminal, and session information management. A packet data service node (PDSN) 140 for providing a packet data service and a packet data service node 140 are connected to verify mobility of a mobile communication terminal, authentication of a packet data service, and a visit agent (FA, not shown). A home agent (HA) 150 that performs packet routing and the like, and an authentication center (AAA) 160 that performs charging, authentication, and the like for the mobile communication terminal.

2 is a block diagram of a general portable Internet system.

As shown, the portable Internet system provides an access function with the mobile communication terminal 100, manages and controls radio resources, supports handover of the mobile communication terminal 100, as well as provides authentication and security functions. A control station connected to a radio access station (RAS) 210 and the Internet 60 to manage IP routing and mobility, and perform an IP multicast function, a billing function, and an inter-base station mobility control function. ACR 220, home agent HA 230 and authentication center AAA 240;

The CDMA2000 network and the portable Internet having such a configuration can interwork in a loosely coupled or tightly coupled manner.

First, in case of using the combined method, the CDMA2000 network and the portable Internet user have independent authentication, charging, and mobility resource management policies. However, in order to support seamless communication, user information needs to be integrated and managed, so interaction between the two networks is required. This requires the use of mobile IP (MIP) technology, but the lack of public IP resources is a problem.

Meanwhile, the close coupling method is a method of directly integrating the CDMA2000 core network and the portable Internet. That is, the control station 220 of the portable Internet is directly connected to the network equipment (eg, PDSN) of the CDMA2000 system, and the portable Internet is coupled as a single access network to the CDMA2000 core network. To this end, all CDMA2000 protocols should be implemented along with the Internet protocol in the gateway of the portable Internet, and similarly, the mobile communication terminal implements the CDMA2000 protocol stack together with the Internet protocol stack to use both stacks simultaneously or perform handover between two networks. If you do, you will need to change the physical layer. In addition, all data transmitted by the mobile communication terminal using the portable Internet is transmitted through the CDMA2000 core network. In this way, different networks perform the same processing for authentication, signal strength, transmission, and billing. And since portable Internet traffic always uses CDMA2000 core network, it should be implemented to handle increased traffic in network component of CDMA2000 system, and CDMA2000 protocol stack should be additionally implemented in addition to portable internet interface for all mobile communication terminals. This requires a significant additional cost.

In summary, in the case of the interworking scheme using the small coupling method, data loss and delay time are increased during the handover process, and in the case of the interlocking scheme using the close coupling method, the traffic reengineering of the mobile communication network is required. There is a problem that the integration and re-implementation of the rest except for the wireless access portion of the mobile Internet system.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to interoperate with a CDMA2000 network and a portable Internet network in which a CDMA2000 system and a portable Internet system can be independently operated while accommodating the advantages of the small coupling method and the close coupling method. There is a technical problem in providing a mobile communication system.

Another technical problem of the present invention is to provide a roaming method capable of providing a continuous service between two mobile communication networks through interworking between a CDMA2000 network and a portable Internet network.

The present invention provides a packet data service to a dual-band dual-mode mobile communication terminal including a base station, a base station controller, a packet controller and a packet data service node. A portable internet system including a base station and a control station for providing a packet data service to a dual band-dual mode mobile communication terminal; And a connection to the packet data service node and the control station, to a home agent, an authentication center, and the Internet, wherein the dual band-dual mode mobile communication terminal is connected to the CDMA2000 system or a portable Internet system. An authentication broker for interworking authentication of the mobile communication terminal, a first tunneling processing unit for establishing and managing a tunnel for transmitting and receiving packet data to a mobile communication terminal connected to the CDMA2000 system, and a mobile access to the portable Internet system A second tunneling processing unit for establishing and managing a tunnel for transmitting and receiving packet data to a communication terminal, an IP allocating unit for allocating an IP address to a mobile communication terminal connected through the CDMA2000 system or the portable Internet system, and the IP allocating unit Refer to the assigned IP address and refer to the dual band-dual mode mobile communication. And an interworking device having a routing processing unit for routing packet data between the new terminal and the CDMA2000 system or the portable Internet system.

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

The portable Internet has weaknesses in mobility and coverage compared to the CDMA2000 network, but has excellent characteristics in terms of data transmission speed that can be provided. Therefore, it is necessary to effectively link the CDMA2000 system having national coverage and the portable Internet system having large scale hotspot coverage to provide the best service for the user environment, and the system structure for this is illustrated in FIG. 3.

3 is a block diagram of a mobile communication system according to the present invention.

As shown, in the present invention, the CDMA2000 system 10 and the portable Internet system 20 are connected by an inter-working unit (IWF) 30. The mutual interworking device 30 is implemented to have a function of effectively connecting different network protocols, and by using the protocol used in the existing system as it is, to minimize the use of the new protocol.

In more detail, the mobile communication terminal 100 according to the present invention is a dual band-dual mode mobile communication terminal which can selectively use the services of the CDMA2000 system and the portable Internet system. There is a function, and a multicast service reception function and an interworking function with other networks can be selectively connected to the CDMA2000 system 10 and the portable Internet system 20. For convenience of description, the communication portion of the dual band-dual mode mobile communication terminal with the CDMA2000 system will be referred to as MS, and the communication portion with the portable Internet system will be referred to as PSS.

The CDMA2000 system 10 is connected to a base station (BTS, 110) for wireless section communication with a mobile communication terminal 100, a base station controller (BSC, 120) for controlling a base station connected to a plurality of base stations, and a base station controller 120 A packet controller (PCF) 130 that performs handover control and management, a packet data service profile management of a mobile communication terminal, session information management, and the like, and is connected between a packet controller 130 and the Internet 60 to a subscriber. And a packet data service node (PDSN) 140 for providing a packet data service.

In addition, the portable Internet system 20 is wirelessly connected to the mobile communication terminal 100 to manage and control radio resources, support handover of the mobile communication terminal 100, as well as authentication and security functions, and downlink multicast. It is connected to the base station (Radio Access Station (RAS) 210) and the Internet 60 to generate and notify functions, billing and statistical information, manage IP routing and mobility, authentication and security functions, and IP multicast functions. And an access control router (ACR) 220 that performs charging, inter-base station mobility control, resource management and control.

Meanwhile, the interworking device 30 is connected between the PDSN 140 of the CDMA2000 system 10 and the ACR 220 of the portable Internet system 20 and the HA 40, AAA 50, and the Internet 60. An authentication broker function that performs authentication for the mobile communication terminal 100 by interworking with the AAA 50, and the mobile communication terminal to guarantee mobility to the same network or the portable Internet for the mobile communication terminal 100 using the CDMA2000 service. Tunneling (L2TP tunneling) function with the PDSN 140 for transmitting and receiving data to and from the 100, and the mobile communication terminal (100) to guarantee mobility to the same network or CDMA2000 network for the mobile communication terminal 100 using the portable Internet service ( Tunneling (IP tunneling) function with the ACR 220 for transmitting and receiving data, IP allocation function for allocating and releasing an IP address to the mobile communication terminal 100, and routing traffic transmitted and received from the mobile communication terminal 100. Routing function and ACR 220 And it performs an interface function for generating tunneling on and off.

FIG. 4 is a detailed configuration diagram of the interlocking device shown in FIG. 3.

As illustrated, the mutual interworking device 30 according to the present invention includes a control unit 310, an authentication broker 320, a first tunneling processing unit 330, a second tunneling processing unit 340, an IP allocation unit 350, It includes a routing processor 360 and a communication network interface 370, the specific functions of each component is as follows.

First, the authentication broker 320 displays the user ID and password included in the message (ACCESS REQUEST) transmitted when the mobile communication terminal 100 accesses the CDMA2000 system 10 or the portable Internet system 20. Request the authentication, and receives the response from the AAA (50) and transmits the authentication result to the PDSN (140) or ACR (220). That is, when the mobile communication terminal 100 requests a service, the mutual interworking device 30 must accurately check whether the terminal is currently receiving a service from another network, and because it does not have authentication and user data, AAA In connection with 50, user authentication is performed.

The first tunneling processing unit 330 uses the L2TP tunneling and data with the mobile communication terminal 100 to ensure mobility to the same network or the portable Internet for the mobile communication terminal 100 provided with the service from the PDSN 140. Send and receive. The reason for using the L2TP is because the PDSN 140 uses the L2TP tunneling function. Accordingly, the function change and addition of the PDSN 140 can be minimized. The interworking device 30 operates as a gateway for transmitting and receiving a packet using the L2TP tunnel generated by the first tunneling processor 330, and the tunnel establishment and release is performed using a standard L2TP message. After the tunnel is established, all packets transmitted and received to the mobile communication terminal 100 are routed through the L2TP tunnel, and when the mobile communication terminal 100 moves to another network or the service is terminated, the control message defined in the L2TP is used. The tunnel is released and the related resources are released or changed.

The second tunneling processor 340 transmits and receives data using IP tunneling to ensure mobility to the same network or another network for the mobile communication terminal 100 provided with the service from the ACR 220. This is because the interworking device 30 must operate as a gateway because the IP address allocation and management for the mobile communication terminal 100 are made in the interworking device 30. After generating the IP tunneling, all packets transmitted and received to the mobile communication terminal 100 are routed through the IP tunnel. When the mobile communication terminal 100 moves to another network or the service is terminated, the IP tunnel is released and the related resources are released or changed.

The IP allocator 350 allocates an IP address to be used by the mobile communication terminal 100 and releases the allocated IP address when the service is terminated. Because IP addresses are limited resources, you should use and release them as appropriate. In particular, the IP allocator 350 allocates the same IP address as used in the network before the mobile terminal 100 moves in accordance with the movement of the mobile terminal 100, thereby efficiently using the limited resources while ensuring the mobility of the mobile terminal 100. Make sure

The routing processor 360 performs a function of routing the traffic received from the mobile communication terminal through the tunnel generated between the PDSN 140 or the ACR 220. That is, after receiving traffic from the mobile communication terminal 100 using the L2TP tunnel set between the PDSN 140 and completing the PPP frame processing, the data is routed to another network, and the IP is set between the ACR 220 through the IP tunnel. Receives traffic from the mobile communication terminal 100 and routes it to another network. On the contrary, when a packet to be transmitted to the mobile communication terminal 100 is received, the PSN frame is processed through the L2TP tunnel after the PPP frame processing to the PDSN 140 using the tunneling information on the corresponding terminal, or the IP tunnel to the ACR 220 side. Send it through.

The communication network interface 370 enables the interworking device 30 to communicate with the CDMA2000 system 10, the portable Internet system 20, and the Internet 60. In particular, for the portable Internet system 20, the communication network interface 370 manages IP tunnels generated between the ACRs 220. In detail, when the mobile communication terminal 100 requests a service to the portable Internet system 20, a tunnel is established between the ACR 220 and the mutual interworking device 30, but the mobile communication terminal stops the service. In this case, since the interworking device 30 cannot detect this fact, the IP address and tunneling information allocated to the mobile communication terminal 100 cannot be released. In addition, when the mobile communication terminal 100 connected to the portable Internet system 20 moves to the CDMA2000 network, the interworking device 30 creates a new tunnel for the mobile communication terminal 100 moved to the CDMA2000 network. In addition, although the tunneling with the ACR 220 that existed previously may be released, the ACR 220 may not release the tunneling information without knowing the fact that the mobile communication terminal 100 is moved. Accordingly, the IP tunneling release function is performed using the ACR 220 and the A-1 interface.

The dual-band dual-mode mobile communication terminal 100 may use the continuous service while moving between the CDMA2000 system 10 and the portable Internet system 20 by the interworking device 30 described above. A roaming method using the companion device 30 will be described.

5 is a flowchart illustrating a roaming method according to an embodiment of the present invention, which illustrates a roaming method when a dual band-dual mode mobile communication terminal using a service of a CDMA2000 network moves to the portable Internet.

Roaming method according to the present embodiment is largely connected to the CDMA2000 system 10 (S101 ~ S109), authentication and IP allocation (S111 ~ S119), packet service providing process (S121, S123), portable Internet system ( 20), the access switching process (S125 to S129), the authentication and IP allocation process (S131 to S141), and the packet service providing process (S143). In addition, it is also possible to further perform a call release process (S145 ~ S153) after the packet service ends.

Specifically, after a traffic channel is allocated between the mobile communication terminal (MS) and the PCF 130 according to a connection request of the mobile communication terminal (MS) (TCH Setup) (S101), the PCF 130 and the PDSN (140). A11 negotiation takes place between That is, the PCF 130 requests the location registration to the PDSN 140 (A11 REG-REQ) (S103) and receives a response message (A11 REG-REP) thereto (S105). When the location registration is performed, link setting is made through the link control protocol (LCP) negotiation between the mobile communication terminal (MS) and the PDSN 140 (S107), and data for authentication is transmitted and received (Auth) (S109).

In order to authenticate the mobile communication terminal (MS), the PDSN 140 requests authentication by transmitting mobile communication terminal (MS) information to the interworking device (IWF) 30 (Access-Req) (S111). Accordingly, the authentication broker 320 of the IWF 30 transmits (MS) information to the AAA 50 (Access-Req) to request authentication (S113), and sends a response message (Access-Accept) thereto. Receive (S115).

As a result of the authentication, if it is determined that the mobile communication terminal (MS) is legitimate, the IP allocator 350 of the IWU 30 allocates an IP address (S117), and includes it in a response message for the authentication request, where the first The tunneling processor 330 transmits the tunneling information (L2TP tunneling) generated by the tunneling processor 330 to the PDSN 140 (Access-Accept) (S119).

Accordingly, a tunnel is generated between the PDSN 140 and the IWU 30, and a connection is made between the mobile communication terminal (MS), the PDSN 140, and the IWU 30 (PPP Setup) (S121). In addition, the user traffic is transmitted through tunneling between the mobile communication terminal (MS) and the PDSN 140 (S123). That is, the packet to be transmitted to the mobile communication terminal (MS) is transmitted to the IWU (30), and then transmitted through the PDSN 140 with reference to the IP address assigned to the mobile communication terminal (MS) by the IWU (30). It is.

As such, when the mobile communication terminal (MS) attempts to access the portable Internet system while using a packet service through the CDMA2000 system, the mobile communication terminal (PSS) performs an initial wireless link connection with the RAS 210 (S125). ). In addition, basic function negotiation is performed between the mobile communication terminal (PSS) and the RAS 210 (S127).

Subsequently, an authentication request message of the mobile communication terminal (PSS) is transmitted to the ACR 220 through the RAS 210 (S129), and the ACR 220 sends the ID and password of the mobile communication terminal (PSS) to the IWU 30. Etc., to request user authentication (Access-Req) (S131). At this time, the authentication broker 320 of the IWU 30 recognizes that the mobile communication terminal (PSS) is a terminal that is using a service by accessing the CDMA2000 system. Thereafter, the authentication broker 320 of the IWU 30 requests the authentication to the AAA 50 (Access-Req) (S133) and receives a response message (Access-Accept) thereto (S135), and the IWU 30 The IP allocator 350 includes the IP address pre-allocated in step S117 and the tunneling information generated by the second tunneling processor 340 in the response message (Access-Accept) for the authentication request. In step S137, the controller 120 transmits to the 220.

Accordingly, an IP tunnel is generated between the ACR 220 and the IWU 30, and the first tunneling processor 330 of the IWU 30 releases the tunnel (L2TP tunnel) with the PDSN 140 (S139). . In addition, the ACR 220 allocates an IP address allocated from the IP allocator 350 of the IWU 30 to the mobile communication terminal (PSS) (S141). Thus, the mobile communication terminal (PSS) and the ACR 220 are allocated. Traffic is transmitted and received between the IWU 30 (S143).

On the other hand, when the mobile communication terminal (PSS) requests to release the service (S145), the ACR 220 requests the call release to the IWU 30 through the AI interface (AI REQ) (S147), IWU (30) The second tunneling processing unit 350 releases the tunnel and stops using the resources (S149 and S151), and reports the call release to the ACR 220 (AI REP) (S153).

6 is a flowchart illustrating a roaming method according to another embodiment of the present invention, which illustrates a roaming method when a dual band-dual-mode mobile communication terminal using a portable Internet service moves to a CDMA2000 network.

The roaming method according to the present embodiment is largely connected to the portable Internet system 20 (S201 to S205), authentication and IP allocation process (S207 to S217), packet service provision process (S219), and CDMA2000 system 10. It is composed of a connection switching process (S221 ~ S229), authentication and IP allocation process (S231 ~ S239), the tunneling release process (S241 ~ S245) of the portable Internet system 20, the packet service providing process (S247). In addition, it is also possible to further perform a call release process (S249 ~ S253) after the packet service ends.

As the mobile communication terminal (PSS) attempts to access the portable Internet system, a wireless link initial connection between the mobile communication terminal (PSS) and the RAS 210 is made (S201), and the mobile communication terminal (PSS) and the RAS 210 are connected. Basic function negotiation is made between (S203).

Subsequently, the authentication request message of the mobile communication terminal (PSS) is transmitted to the ACR 220 through the RAS 210 (S205), and the ACR 220 sends the ID and password of the mobile communication terminal (PSS) to the IWU 30. And the like to request user authentication (Access-Req) (S207). Accordingly, the authentication broker 320 of the IWU 30 requests authentication to the AAA 50 (Access-Req) (S209) and receives a response message (Access-Accept) thereto (S211).

As a result of the authentication, when it is confirmed that the mobile terminal (PSS) is legitimate, the IP allocator 350 of the IWU 30 allocates an IP address (S213) and tunneling generated by the second tunneling processor 340 (IP tunneling). The information is included in the response message (Access-Accept) for the authentication request and transmitted to the ACR 220 (S215).

Accordingly, an IP tunnel is generated between the ACR 220 and the IWU 30, and the ACR 220 receiving the IP address allocates an IP address to the mobile communication terminal (PSS) (S217). Traffic is transmitted and received between the PSS, the ACR 220, and the IWU 30 (S219).

As such, as the MS attempts to access the CDMA2000 system while using the packet service through the portable Internet system, a traffic channel is allocated between the MS and the PCF 130 (TCH Setup). (S221), A11 negotiation is made between the PCF 130 and the PDSN 140. That is, the PCF 130 requests the location registration to the PDSN 140 (A11 REG-REQ) (S223) and receives a response message (A11 REG-REP) thereto (S225). When location registration is performed, link establishment is performed through a link control protocol (LCP) negotiation between the mobile communication terminal (MS) and the PDSN 140 (S227), and data for authentication is transmitted and received (Auth) (S229).

For authentication of the mobile communication terminal (MS), the PDSN 140 transmits mobile communication terminal (MS) information to the interworking device (IWF) 30 and requests authentication (Access-Req) (S231). Accordingly, the authentication broker 320 of the IWF 30 recognizes that the mobile communication terminal (MS) is a mobile Internet service, and transmits terminal (MS) information to the AAA 50 (Access-Req). Request an authentication (S233), and receive a response message (Access-Accept) (S235).

As a result of the authentication, if the mobile communication terminal (MS) is found to be legitimate, the IP allocation unit 350 of the IWU 30 includes the IP address previously assigned in step S213 in the response message for the authentication request, the first tunneling processing unit Along with the tunneling (L2TP tunneling) information generated at 330 is transmitted to the PDSN (140) (Access-Accept) (S237). Accordingly, a tunnel is generated between the PDSN 140 and the IWU 30, and a connection is made between the mobile communication terminal (MS), the PDSN 140, and the IWU 30 (PPP Setup) (S239). The IWU 30 notifies the ACR 220 that tunneling has been replaced by another network, for example, using the A-I interface (A-I notification) (S241). Upon receiving this, the ACR 220 requests tunnel release and call release to the IWU 30 (AI REQ) (S243), and the second tunneling processing unit 340 of the IWU 30 opens a tunnel with the ACR 220. When released, it is reported to the ACR 220 (AI REP) (S245). In addition, the routing for the mobile communication terminal (MS) is changed to tunneling with the PDSN 140 (L2TP tunneling).

Now, the user traffic is to be transmitted through tunneling between the mobile communication terminal (MS) and the PDSN (140) (S247).

On the other hand, if the mobile communication terminal (MS) wants to release the connection to perform the PPP release to release the tunneling (S249), if the PCF 130 requests the session release to the PDSN (140) (A11 DREG-REQ) The call is released by the PDSN 140 releasing the session and transmitting a response message (A11 DREG-REO) (S253).

Those skilled in the art to which the present invention described above belongs will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not as restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

According to the present invention, by introducing an interworking device, a linkage between a CDMA2000 system and a portable Internet system for a dual band-dual mode mobile communication terminal is possible. In addition, there is an advantage that the limited resources can be efficiently used by continuing to use the previously assigned IP address for the roaming mobile communication terminal.

In addition, the mutual interworking apparatus establishes an L2TP tunnel with the CDMA2000 system and an IP tunnel with the portable Internet system, thereby routing the packet data to the mobile communication terminal without error.

Claims (24)

A CDMA2000 system for providing a packet data service to a dual band-dual mode mobile communication terminal including a base station, a base station controller, a packet controller, and a packet data service node; A portable internet system including a base station and a control station for providing a packet data service to a dual band-dual mode mobile communication terminal; Connected to the packet data service node and the control station, connected to a home agent, an authentication center and the Internet, and interworking with the authentication center as the dual band-dual mode mobile communication terminal accesses the CDMA2000 system or the portable Internet system. An authentication broker for brokering authentication of the mobile communication terminal, a first tunneling processing unit for establishing and managing a tunnel for transmitting and receiving packet data to a mobile communication terminal connected to the CDMA2000 system, and a mobile communication connected to the portable Internet system A second tunneling processor for establishing and managing a tunnel for transmitting and receiving packet data to a terminal, an IP allocator for allocating an IP address to a mobile communication terminal connected through the CDMA2000 system or a portable Internet system, and the IP allocator Dual band-dual mode mobile communication with reference to one IP address Interworking device comprising between the end and the CDMA2000 system or the portable Internet system, the routing processor for routing a data packet; Mobile communication system comprising a. The method of claim 1, And the first tunneling processor communicates with a packet data service node of the CDMA2000 system through an L2TP tunnel. The method of claim 1, And the second tunneling processor communicates with a control station of the portable Internet system through an IP tunnel. The method of claim 1, And the IP allocator allocates the same IP as the allocated IP before roaming to the roaming mobile communication terminal. The method of claim 1, And the routing processor performs PPP frame processing before performing packet data routing between the dual band dual mode mobile communication system and the CDMA2000 system. The method of claim 1, The mutual interworking device is a mobile communication system, characterized in that for transmitting and receiving a control signal with the portable Internet system through the A-I interface. In a mobile communication system in which a CDMA2000 including a base station, a base station controller, a packet controller, and a packet data service node, and a portable Internet including a base station and a control station are linked by an interworking device connected to an authentication center, the CDMA2000 network A roaming method of a dual band-dual mode mobile communication terminal selectively connected to the portable Internet, A first step of performing an initial access to the CDMA2000 network of the dual band-dual mode mobile communication terminal according to a connection request of the dual band-dual mode mobile communication terminal; A second step of performing authentication and allocating an IP address in the CDMA2000 network as the packet data service node requests authentication of the dual band dual mode mobile communication terminal to the interworking device; A third step of providing a packet data service to the dual band dual mode mobile communication terminal connected to the interworking device through the packet data service node by the IP address; A fourth step of performing an initial connection to the portable Internet of the dual band-dual mode mobile communication terminal according to a request for switching the connection of the dual band-dual mode mobile communication terminal; A fifth step of performing authentication and allocating an IP address in the interworking device when the control station of the portable Internet requests authentication of the dual band dual-mode mobile communication terminal from the interworking device; And A sixth step of providing a packet data service to the dual band dual-mode mobile communication terminal connected to the interworking device through the control station by the IP address; Roaming method in a mobile communication system capable of interworking between the CDMA2000 network and the portable Internet comprising a. The method of claim 7, wherein The first process may include: assigning a traffic channel between the mobile communication terminal and a packet controller according to a connection request of the dual band-dual mode mobile communication terminal; Performing location registration with respect to the mobile communication terminal at the request of the packet controller; Establishing a link between the mobile communication terminal and the packet data service node; And Transmitting authentication data from the mobile communication terminal to the packet data service node; Roaming method in a mobile communication system capable of interworking between the CDMA2000 network and the portable Internet comprising a. The method of claim 7, wherein The second process may include: requesting authentication by transmitting, by the packet data service node, the mobile communication terminal information to the interworking device; Transmitting, by the interworking device, the mobile communication terminal information to an authentication center to request authentication and to receive a response message; If it is determined that the mobile communication terminal is legitimate as a result of the authentication, the step of assigning an IP address and generating tunneling information by the interworking device; And The interworking device transmitting an authentication response message including the IP address and tunneling information to the packet data service node to generate a tunnel between the packet data service node and the interworking device; Roaming method in a mobile communication system capable of interworking between the CDMA2000 network and the portable Internet comprising a. The method of claim 9, And the tunneling information is generated based on L2TP tunneling. 2. A roaming method in a mobile communication system capable of interworking between a CDMA2000 network and a portable Internet. The method of claim 7, wherein The third process may include: establishing a connection between the packet data service node and the mutual companion device; And Transmitting and receiving traffic between the mobile communication terminal and the mutual companion device; Roaming method in a mobile communication system capable of interworking between the CDMA2000 network and the portable Internet comprising a. The method of claim 7, wherein The fourth process includes: performing a basic function negotiation between the mobile communication terminal and a base station of the mobile internet as the mobile communication terminal attempts to access the portable internet system while using a packet service through the CDMA2000 system; And Requesting, by the mobile communication terminal, authentication from the control station; Roaming method in a mobile communication system capable of interworking between the CDMA2000 network and the portable Internet comprising a. The method of claim 7, wherein The fifth process may include: requesting authentication by transmitting information of the mobile communication terminal from the control station to the interworking device; Recognizing that the mobile communication terminal is a terminal previously connected to the CDMA2000 network, requesting authentication by transmitting the mobile communication terminal information to the authentication center, and receiving a response message; When it is determined that the mobile communication terminal is legitimate, a tunnel is generated between the control station and the interworking device by generating tunneling information and transmitting an authentication response message including the IP address assigned in the second process to the control station. To be generated; Disconnecting, by the interworking device, the CDMA2000 network; And The control station assigning the IP address to the mobile communication terminal; Roaming method in a mobile communication system capable of interworking between the CDMA2000 network and the portable Internet comprising a. The method of claim 13, And the tunneling information is generated based on IP tunneling. The roaming method of a mobile communication system capable of interworking between a CDMA2000 network and a portable Internet. The method of claim 7, wherein After the sixth process, as the mobile communication terminal requests the service release to the portable Internet network, the control station requests the call release to the interworking device, releases resources from the interworking device, and stops using it. And performing a seventh process of reporting to the control station that call release is completed, and then roaming in a mobile communication system capable of interworking with a CDMA2000 network and the portable Internet. In a mobile communication system in which a CDMA2000 network including a base station, a base station controller, a packet controller, and a packet data service node and a portable Internet including a base station and a control station are linked by an interworking device connected to an authentication center, the CDMA2000 network A roaming method of a dual band dual-mode mobile communication terminal selectively connected to a mobile phone and a mobile internet A first step of performing an initial connection to the portable Internet of the dual band-dual mode mobile communication terminal according to a connection request of the dual band-dual mode mobile communication terminal; A second step of performing authentication and allocating an IP address in the interworking device when the control station of the portable Internet requests authentication of the dual band dual mode mobile communication terminal to the interworking device; A third step of providing a packet data service to the dual band dual mode mobile communication terminal connected to the interworking device through the control station by the IP address; A fourth step of performing initial access to the CDMA2000 network of the dual band-dual mode mobile communication terminal according to a request for switching the connection of the dual band-dual mode mobile communication terminal; A fifth process of performing authentication and allocating an IP address in the CDMA2000 network as the packet data service node requests authentication of the dual band dual-mode mobile communication terminal to the interworking device; A sixth step of releasing a connection between the control station and the interworking device; A seventh step of providing a packet data service to the dual band-dual mode mobile communication terminal connected to the interworking device through the packet data service node by the IP address allocated in the fifth step; Roaming method in a mobile communication system capable of interworking between the CDMA2000 network and the portable Internet comprising a. The method of claim 16, The first process includes: performing basic function negotiation between the mobile communication terminal and a base station of the portable Internet; And Requesting, by the mobile communication terminal, authentication from the control station; Roaming method in a mobile communication system capable of interworking between the CDMA2000 network and the portable Internet comprising a. The method of claim 16, The second process may include: requesting authentication by transmitting information of the mobile communication terminal from the control station of the portable Internet to the interworking device; Transmitting, by the interworking device, the mobile communication terminal information to the authentication center to request authentication, and receiving a response message; If it is determined that the mobile communication terminal is legitimate, generating tunneling information and generating an IP address; Transmitting an authentication response message including the tunneling information and the IP address to the control station, such that a tunnel is created between the control station and the interworking device; And The control station assigning the IP address to the mobile communication terminal; Roaming method in a mobile communication system capable of interworking between the CDMA2000 network and the portable Internet comprising a. The method of claim 18, And the tunneling information is generated based on IP tunneling. The roaming method of a mobile communication system capable of interworking between a CDMA2000 network and a portable Internet. The method of claim 16, The fourth process includes: allocating a traffic channel between the mobile communication terminal and a packet controller according to a connection request of the dual band-dual mode mobile communication terminal; Performing location registration with respect to the mobile communication terminal at the request of the packet controller; Establishing a link between the mobile communication terminal and the packet data service node; And Transmitting authentication data from the mobile communication terminal to the packet data service node; Roaming method in a mobile communication system capable of interworking between the CDMA2000 network and the portable Internet comprising a. The method of claim 16, The fifth process may include: requesting authentication by transmitting, by the packet data service node, the mobile communication terminal information to the interworking device; Recognizing, by the interworking device, that the mobile communication terminal is a terminal previously connected to the mobile Internet, transmitting the mobile communication terminal information to an authentication center to request authentication and receiving a response message; And If it is determined that the mobile communication terminal is legitimate as a result of the authentication, the mutual interworking device generates tunneling information and sends an authentication response message including the IP address and the tunneling information allocated in the second step to the packet data service node. Transmitting a tunnel between the packet data service node and the interworking device; Roaming method in a mobile communication system capable of interworking between the CDMA2000 network and the portable Internet comprising a. The method of claim 21, And the tunneling information is generated based on L2TP tunneling. 2. A roaming method in a mobile communication system capable of interworking between a CDMA2000 network and a portable Internet. The method of claim 16, The sixth step may include: reporting, by the interworking device, that the connection of the mobile communication terminal has been made to the control station; Requesting, by the control station, to release the connection to the interlocking device; And The interworking device releasing the connection with the control station and reporting the release result, and then switching the connection to the CDMA2000 system; Roaming method in a mobile communication system capable of interworking between the CDMA2000 network and the portable Internet comprising a. The method of claim 16, After the seventh process, as the mobile communication terminal wants to release the connection, releasing the connection between the mobile communication terminal and the mutual companion device; The packet controller requesting a session release from the packet data service node; And The packet data service node releasing the session and sending a response message to the packet controller; Roaming method in a mobile communication system capable of interworking between the CDMA2000 network and the portable Internet comprising a.

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