KR101090531B1

KR101090531B1 - Mobile Communication System for Handover Between Asynchronous Mobile Communication System and WiBro System, and Handover Method in the Same

Info

Publication number: KR101090531B1
Application number: KR1020040087811A
Authority: KR
Inventors: 김도완; 박종관; 김성
Original assignee: 에스케이 텔레콤주식회사
Priority date: 2004-11-01
Filing date: 2004-11-01
Publication date: 2011-12-08
Also published as: KR20060038691A

Abstract

A mobile communication system capable of mutual handover between an asynchronous mobile communication network and a WiBro network and a handover method in the system are provided.

The present invention provides a mobile communication system capable of handover of a multimode multiband mobile communication terminal including a WCDMA modem unit and a WiBro modem unit in a mobile communication network in which an asynchronous mobile communication network and a WiBro network are overlapped. Connected to each other, the interworking unit operates as a control station of the WiBro network for the mobile communication terminal that has moved from the WiBro network to the asynchronous mobile communication network, and to the SGSN of the asynchronous mobile communication network for the UE that has moved from the asynchronous mobile network to the WiBro network. It works.

According to the present invention, a mobile communication terminal moving between a WCDMA network and a WiBro network can use the data service continuously without interruption of service using an interworking unit connecting the WCDMA network and the WiBro network to improve service quality.

WCDMA, WiBro, Handover

Description

Mobile Communication System for Handover Between Asynchronous Mobile Communication System and WiBro System, and Handover Method in the Same}

1 is a block diagram of a mobile communication system capable of handover between an asynchronous mobile communication network and a WiBro network according to the present invention;

2 is a flowchart illustrating a data call origination procedure in a WiBro network;

3 is a flowchart illustrating a data call origination procedure in an asynchronous mobile communication network;

4 is a flowchart for explaining a handover method from a WiBro network to an asynchronous mobile communication network;

5 is a flowchart illustrating a handover method from an asynchronous mobile communication network to a wibro network.

Description of the Related Art [0002]

10: multi-mode multi-band mobile communication terminal 20: asynchronous mobile communication system

30: WiBro system 40: Interworking unit

50: authentication center 210: node B

220: wireless network controller 230: SGSN

240: GPRS network 250: GGSN

310: base station 320: control station

The present invention relates to a mobile communication system and a handover method capable of handover between heterogeneous mobile communication networks, and more particularly, to a mobile communication system capable of mutual handover between an asynchronous mobile communication network and a WiBro network and a handover method in the system. It is about.

Recently, wireless Internet service using a mobile communication terminal has been 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. In addition, since the data rate is low, there is a disadvantage in that the multimedia content is not appropriate. 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.

Meanwhile, with the expansion of laptops, PCs, and low-cost LAN equipment, there are increasing cases of free access to the Internet wirelessly at home. In addition, as a hot spot service through a public wireless LAN is provided, high-speed wireless Internet access is enabled in a public place using a portable computing terminal. Internet access service through public wireless LAN provides almost the same quality as wired environment, and it has the advantage of low cost, while it provides a narrow coverage area, weak mobility, and reliable and flawless service outdoors. There is a limit.

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. WiBro service is defined as a service that enables high-speed wireless Internet access anytime, anywhere, even while stationary and mobile. Currently, WiBro system is partially implemented in regions with high service utilization rate, and is overlapped with existing WCDMA system.

The WCDMA system guarantees high-speed data service and mobility of UE, and is implemented to have wider coverage than WiBro. However, WCDMA system is expensive to use data service, and it is expensive to design network such as base station and repeater, and additional cost is incurred due to severe loss of radio waves in in-building area. There is a disadvantage that occurs. On the other hand, the WiBro system has a lower guarantee of mobility than WCDMA, but can use data services at a low service fee, and has a low cost in network design. Therefore, proper use of WCDMA system and WiBro system can improve the quality of packet data service.

However, at present, a method for supporting handover between a WCDMA system and a WiBro system has not been proposed. Therefore, interworking between two networks is not possible, and thus, when a mobile communication terminal moves between the two networks, continuous service cannot be provided. have.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned disadvantages and problems. When the mobile communication terminal using the packet data service in the asynchronous mobile communication network moves to the WiBro network, or uses the packet data service in the WiBro network, There is a technical problem to provide a mobile communication system and a handover method that can prevent service disconnection by providing a continuous packet data service when a communication terminal moves to an asynchronous mobile communication network.

The present invention provides a handover method of a multi-mode multiband mobile communication terminal having a WCDMA modem unit and a WiBro modem unit in a mobile communication network in which an asynchronous mobile communication network and a WiBro network are connected by an interworking unit. A first step of requesting connection with an SGSN of the asynchronous mobile communication network by the WCDMA modem unit of the mobile communication terminal as the mobile communication terminal connected to the WiBro network moves to the asynchronous mobile communication network; Requesting the SGSN to generate data service information to the interworking unit; A third step of performing the registration and authentication procedure of the WCDMA modem unit by the mutual interworking unit; A fourth step of the mutual interworking unit transmitting a response signal to the SGSN to the data service information generation request; And a fifth process of starting a data service between the WCDMA modem unit and a control station of the WiBro network via the interworking unit as the SGSN transmits a response message to the WCDMA modem unit. .

In addition, the present invention provides a handover method of a multimode multiband mobile communication terminal having a WCDMA modem unit and a WiBro modem unit in a mobile communication network in which an asynchronous mobile communication network and a WiBro network are connected to each other by an interlocking unit. A first step of requesting connection to the WiBro network and performing authentication as the mobile communication terminal moves to the WiBro network; A second step of, when the WiBro modem unit requests registration with a base station of the WiBro network, the base station requests registration with the interworking unit, and performs registration of the WiBro modem unit in the interworking unit; A third step of transmitting, by the base station, a response signal to the registration request to the WiBro modem unit; A fourth step of setting up information for data communication between the WiBro modem unit and the base station; And a fifth step of initiating a data service between the WiBro modem unit and the asynchronous mobile communication network via the mutual interworking unit.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention. In the following description, the mobile communication terminal is a multi-mode multi-band mobile communication terminal having a WCDMA modem unit and a WiBro modem unit, which are implemented to be used in both an asynchronous mobile communication system and a WiBro mobile communication system. .

1 is a block diagram of a mobile communication system capable of handover between an asynchronous mobile communication network and a WiBro network according to the present invention.

As shown, the mobile communication terminal 10 is selectively wirelessly connected to the asynchronous mobile communication system 20 represented by WCDMA and the WiBro system 30, which is a portable Internet system, to use data services.

The asynchronous mobile communication system 20 is a Node B 210 as a base station for wireless section communication with the mobile communication terminal 10, a radio network controller (RNC, 220) for controlling a plurality of Node B, a radio network controller ( Serving GPRS Support Node (SGSN) 230 and SGSN 230 and General Packet Radio Service (GPRS) network 240, which are connected to 220 to maintain track of the mobile communication terminal 10 and perform access control and security functions. It is connected through the IP network (not shown) includes a GGSN (Gateway GPRS Support Node, 250) for supporting interworking with external packets.

In addition, the WiBro system 30 provides an access function with the mobile communication terminal 10, manages and controls radio resources, supports handoff of the mobile communication terminal 10, and performs authentication and security functions. A Radio Access Station (RAS) 310 and an Access Control Router (ACR) 320 that manages IP routing and mobility, and performs an IP multicast function, a charging function, an inter-base station mobility control function, and the like. .

The WCDMA system 20 and the WiBro system 30 are connected through an Inter Working Unit (IWF) 40 so that the mobile communication terminal 10 moves from the WCDMA network to the WiBro network or from the WBDMA network to the WCDMA network. If necessary, exchange the necessary message.

In such a mobile communication system, when the mobile communication terminal moves from the home network to another network, the mutual interworking unit 40 is used to enable the service from the home network even after moving to the other network. That is, when the mobile communication terminal is connected to the WiBro network and uses the packet data service, and moves to the WCMDA network, the WCDMA modem unit of the mobile communication terminal connects to the WCDMA network by the call procedure to the WCMDA network and then interoperates with each other. The unit 40 is connected to the control station of the wibro network to continue to use the service from the wibro network. In addition, when the mobile communication terminal is connected to the WCDMA network and uses the packet data service and moves to the WiBro network, the WiBro modem unit of the mobile communication terminal connects to the WiBro network by a procedure for transmitting to the WiBro network, and then interoperates with each other. The unit 40 is connected to the SGSN 230 of the WCDMA network to continue to use the service from the WCMDA network.

To this end, the interworking unit 40 operates as a control station of the WiBro network for the mobile communication terminal that has moved from the WiBro network to the WCDMA network, and operates as an SGSN of the WCDMA network for the UE that has moved from the WCDMA network to the WiBro network. .

2 is a flowchart illustrating a data call origination procedure in a WiBro network.

First, the mobile communication terminal 10 is connected to the base station 310 (Initial Access) (S110) to negotiate information necessary to use the service (Negotiation) (S120), and connected to the authentication center (AAA) to determine the legitimacy. (Authentication) (S130).

Subsequently, the mobile communication terminal 10 requests registration to the base station 310 (Registration Request) (S140), and accordingly, the base station 310 registers the control station 320 and the corresponding mobile communication terminal 10. After performing (Registration) (S150), the registration result is reported to the mobile communication terminal 10 (Registration Reply) (S160).

Subsequently, the control station 320 allocates an IP address to the mobile communication terminal 10 (S170), and the mobile communication terminal 10 performs service setup with the base station 310 according to the assigned IP address (Flow Setup). (S180) A data service is used through the control station 320 (Traffic Flow) (S190).

3 is a flowchart illustrating a data call origination procedure in an asynchronous mobile communication network.

When the mobile communication terminal 10 sends a data call, the radio network controller 220 allocates radio resources to the mobile communication terminal (Setup Radio Resources) (S210), the mobile communication terminal 10 to the SGSN (230) Request for activating data service information (Activate PDP Context Request) (S220), SGSN 230 requests (Create PDP Context Request) to GGSN 250 to generate data service information (S230). Accordingly, an authentication procedure for the mobile communication terminal 10 is performed between the GGSN 250 and the authentication center 50 (RADIUS) (S240), and the GGSN 250 responds to a request for generating data service information (Create). The PDP Context Response) signal is transmitted to the SGSN 230 (S250). As a result, data service related information such as an IP address is generated between the SGSN 230 and the GGSN 250 and a session is generated.

Subsequently, as SGSN 230 transmits an active PDP context accept signal to the mobile communication terminal 10 in response to the data service activation request (S260), the data service is started between the mobile communication terminal and the GGSN 250. do.

4 is a flowchart illustrating a handover method from a WiBro network to an asynchronous mobile communication network. In the present embodiment, even when the mobile communication terminal connected to the WiBro network moves to the WCDMA network, the mobile communication terminal may receive a service from the WiBro network.

First, when the mobile communication terminal 10 moves from the WiBro network to the WCDMA network and requires a handover, the WiBro modem unit of the mobile communication terminal requests the WCDMA modem unit to connect to the WCDMA network. Accordingly, when the WCDMA modem portion of the mobile communication terminal 10 transmits a data call, the radio network controller 220 allocates radio resources to the mobile communication terminal (Setup Radio Resources) (S310), and the mobile communication terminal 10. The SGSN 230 requests to activate the data service information (Activate PDP Context Request) (S320), and the SGSN 230 requests the interworking unit 40 to generate the data service information (Create PDP Context Request). (S330). That is, in this embodiment, the interlocking unit 40 operates as a control station of the WiBro network.

Next, the mutual interworking unit 40 requests the registration of the mobile communication terminal 10 to the control station 320 of the WiBro network (Registration Request) (S340), and through the authentication center 50, the corresponding mobile communication terminal ( After performing the authentication procedure for 10) (Authentication) (S350), and receives a response to the registration request from the control station 320 (Registration Reply) (S360). At this time, the registration request and response message uses a handover message used between the control stations of the WiBro network.

Subsequently, the mutual interworking unit 40 transmits a response (Create PDP Context Response) signal to the SGSN 230 in response to the data service information generation request (S370). As a result, data service related information such as an IP address is generated between the SGSN 230 and the interworking unit 40, and a session is generated.

Thereafter, as SGSN 230 transmits an Activate PDP Context Accept signal to the mobile communication terminal 10 in response to the data service activation request (S380), the data service is started between the mobile communication terminal and the control station 320. The data is transmitted and received through the control station of the WCDMA modem unit-wireless network controller-SGSN-interworking unit-WiBro network of the mobile communication terminal.

As such, after the mobile communication terminal 10 moves from the WiBro network to the WCDMA network, the mobile communication terminal 10 is continuously connected to the WiBro network by the relay of the interworking unit 40 to use the data service. After the WCDMA modem unit starts data service via the interworking unit 40, the connection with the base station of the WiBro network connected to the WiBro modem unit is terminated.

First, when the mobile communication terminal 10 moves from the WCDMA network to the WiBro network and requires a handover, the WCDMA modem unit of the mobile communication terminal requests the WiBro modem unit to connect to the WiBro network. Accordingly, the WiBro modem unit of the mobile communication terminal 10 is connected to the base station 310 (Initial Access) (S410) to negotiate information necessary to use the service (Negotiation) (S420), and is connected to the authentication center (AAA). Legality is determined (Authentication) (S430).

Subsequently, the mobile communication terminal 10 requests registration to the base station 310 (Registration Request) (S440), and accordingly, the base station 310 registers the mutual interworking unit 40 and the corresponding mobile communication terminal 10. After performing (Registration) (S450), the GGSN 250 is connected to perform a handover procedure (SRNS Relocation Procedure) (S460). In this case, the handover message used in the WCDMA network is used. That is, in this embodiment, the interworking unit 40 operates as SGSN of the WCDMA network.

Subsequently, the mutual interworking unit 40 reports the registration result to the base station 310 (Registration Reply) (S470). The base station 310 transmits a response message to the handover request to the mobile communication terminal 10 (Registration Reply) (S480). Next, the mobile communication terminal 10 sets up information for service data communication with the base station 310 (Flow Setup) (S490) and uses a data service through the GGSN 250 (Traffic Flow) (S500). . That is, data is transmitted and received through the GGSN of the WiBro modem unit-WiBro network of the mobile communication terminal-interworking unit-WCDMA network.

As described above, the mobile communication terminal 10 moves from the WCDMA network to the WiBro network and is subsequently connected to the WCDMA network by the relaying of the interworking unit 40 to use the data service. The mobile communication terminal 10 After the WiBro modem unit starts data service through the interworking unit 40, the connection with the Node B of the asynchronous mobile communication network connected to the WCDMA modem unit is terminated.

In the present invention, by using the interworking unit connecting the WCDMA network and the WiBro network, it is possible to provide a continuous service to the mobile communication terminal to move between the WCDMA network and the WiBro network, in particular the mobile communication terminal from the WiBro network to the WCDMA network If the mobile terminal is moved to the WiBro network control station, and if the mobile terminal is moved from the WCDMA network to the WiBro network to operate as SGSN of the WCDMA network, the service provided by the mobile communication network before the move You can continue to use it.

Those skilled in the art to which the present invention described above belongs will understand 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.

In the above-described present invention, in a mobile communication system in which a WCDMA network and a WiBro network overlap, a mobile communication terminal that moves between the WCDMA network and a WiBro network continuously using the interworking unit connecting the WCDMA network and the WiBro network without interruption of service. The quality of service can be improved by making data services available.

Claims

A mobile communication system capable of handover of a multimode multiband mobile communication terminal having a WCDMA modem unit and a WiBro modem unit in an asynchronous mobile communication network and a WiBro network,

The asynchronous mobile communication network and the WiBro network are connected by an interlocking unit, and the mutual interlocking unit operates as a control station of the WiBro network with respect to a mobile communication terminal moving from the WiBro network to the asynchronous mobile communication network. The mobile communication system according to claim 1, wherein the mobile station operates as SGSN of the asynchronous mobile communication network.

The method of claim 1,

The mutual interworking unit is connected between the SGSN of the asynchronous mobile communication network and the control station of the WiBro network.

A handover method of a multimode multiband mobile communication terminal having a WCDMA modem unit and a WiBro modem unit in a mobile communication network in which an asynchronous mobile communication network and a WiBro network are connected by an interworking unit.

A first step of requesting connection with an SGSN of the asynchronous mobile communication network by the WCDMA modem unit of the mobile communication terminal as the mobile communication terminal connected to the WiBro network moves to the asynchronous mobile communication network;

Requesting the SGSN to generate data service information to the interworking unit;

A third step of performing the registration and authentication procedure of the WCDMA modem unit by the mutual interworking unit;

A fourth step of the mutual interworking unit transmitting a response signal to the SGSN to the data service information generation request; And

A fifth step of initiating a data service between the WCDMA modem unit and a control station of the WiBro network via the interworking unit as the SGSN transmits a response message to the WCDMA modem unit;

Handover method comprising a.

The method of claim 3, wherein

The first step may include: assigning radio resources to the WCDMA modem unit by the wireless network controller of the asynchronous mobile communication network as the WCDMA modem unit transmits a data call; And

Requesting, by the WCDMA modem unit, to activate data service information to the SGSN;

Handover method comprising a.

The method of claim 3, wherein

The third step may include: requesting, by the interworking unit, registration of the WCDMA modem unit to a control station of the WiBro network;

Connecting the control station to an authentication center to perform authentication of the WCDMA modem unit; And

Sending, by the control station, a response message to the registration request to the interworking unit;

Handover method comprising a.

The method of claim 3, wherein

The registration procedure of the third process is performed using a handover message used between control stations of the WiBro network.

The method of claim 3, wherein

And a fifth step of terminating the connection between the WiBro modem unit of the mobile communication terminal and the base station of the WiBro network after the fifth process.

A first step of requesting and authenticating a connection to the WiBro network by a WiBro modem unit of the mobile communication terminal as the mobile communication terminal connected to the asynchronous mobile communication network moves to the WiBro network;

A second step of, when the WiBro modem unit requests registration with a base station of the WiBro network, the base station requests registration with the interworking unit, and performs registration of the WiBro modem unit in the interworking unit;

A third step of transmitting, by the base station, a response signal to the registration request to the WiBro modem unit;

A fourth step of setting up information for data communication between the WiBro modem unit and the base station; And

A fifth step of initiating a data service between the WiBro modem unit and the asynchronous mobile communication network via the mutual interworking unit;

Handover method comprising a.

The method of claim 8,

The first process may include negotiating information necessary for service use between the base station and the WiBro modem unit as the WiBro modem unit transmits a data call to a base station of the WiBro network; And

Performing authentication of the WiBro terminal in an authentication center;

Handover method comprising a.

The method of claim 8,

The second process includes the step of requesting the base station to register with the interworking unit;

Registering, by the interworking unit, the WiBro modem unit with a GGSN of the asynchronous mobile communication network; And

Transmitting, by the mutual interworking unit, a response signal to the registration request to the base station;

Handover method comprising a.

The method of claim 8,

The registration procedure of the second process is performed using a handover message used in the asynchronous mobile communication network.

The method of claim 8,

And a fifth step of terminating the connection between the WCDMA modem unit of the mobile communication terminal and the NodeB of the asynchronous mobile communication network after the fifth step.