KR100902752B1 - System and method for selecting access network in multi-mobile communication networks environment - Google Patents

Abstract

The present invention provides an access network selection system and method in a multi-mobile communication network environment that allows a terminal to select an access network to access.

To this end, the present invention is a multi-mode terminal that is selectively wirelessly connected to any one network in the environment in which at least two or more heterogeneous networks are overlaid; If a network selection request message is generated in response to receiving an outgoing signal from the multi-mode terminal, and the network selection response message received in response to the network selection request message includes a second access network as a recommended network, the multi-mode terminal A first access network requesting to retry the originating signal to the second access network; When the network selection request message is received from the first access network, the intelligent server, which stores information necessary for optimal network selection, requests and is provided with information necessary for optimal network selection, and receives the optimal information provided from the intelligent server. Select the optimal network that can provide the service to be used by the multi-mode terminal on the basis of the information necessary for network selection, the preferred access network information and the service information of the terminal user, and selects the information on the selected network It includes a network selection server that is included in the response message and transmitted to the first access network.

Accordingly, the present invention allows the terminal to receive the service through the optimal network.

Overlay, multimode terminal, optimal network selection

Description

SYSTEM AND METHOD FOR SELECTING ACCESS NETWORK IN MULTI-MOBILE COMMUNICATION NETWORKS ENVIRONMENT}

The present invention relates to an access network selection system and method in a multiple mobile communication network environment. In particular, the present invention relates to a multiple mobile communication network that allows access to an optimal network selected by a network in consideration of user preferences, using services, user location information, and network conditions. A system and method for selecting an access network in an environment.

Mobile communication is the first generation of FDMA (Frequency Division Multiple Access) method, and through the second generation of digital mobile communication using Code Division Multiple Access (CDMA) or Time Division Multiple Access (TDMA) method, the first generation of analog mobile communication, while ensuring mobility It has evolved into 3rd generation mobile communication (IMT-2000 (WCDMA), WIBRO, etc.) that overcomes local and voice-oriented limitations of mobile communication and provides non-voice services (voice, data, video, video) regardless of region. Many development activities are currently underway for the 4th generation mobile communication which can provide a complete multimedia mobile communication service.

As described above, as a new network is introduced due to the development of mobile communication technology, various mobile communication networks such as CDMA 2000, Wireless Broadband Internet (WIBRO), and Wideband CDMA (WCDMA) are overlaid, and various mobile communication networks are used. Various wireless access technologies, such as DBDM (Double Band Double Mode) and TBTM (Triple Band Triple Mode), can be connected to one mobile communication terminal in order to connect to various mobile communication networks using one mobile communication terminal in an overlaid environment. Integrated multi-mode terminals have been manufactured and used.

As described above, when a multi-mode terminal wirelessly connects to a mobile communication network in an environment in which various mobile communication networks are overlaid, conventionally, a method of accessing a mobile communication network manually selected by a terminal user according to a preset priority is given. There is a method of automatically connecting to the corresponding mobile communication network, a method of connecting to the mobile communication network having the largest received signal strength, and the like.

However, in the related art, since the terminal selects a mobile communication network to be connected and attempts to connect, the network situation is not taken into consideration, resulting in a problem such that the connection is biased to any one mobile communication network, causing overload.

The present invention has been made to solve the above-described problems, the network side in consideration of the user's preferences, using services, user location information and network conditions, such as selecting the optimal network, and requesting reconnection to the selected network to the terminal It is an object of the present invention to provide an access network selection system and method in a multi-mobile communication network environment that enables access to a selected network at the network side.

According to an embodiment of the present invention, an access network selection system in a multiple mobile communication network environment may be selectively wirelessly connected to any one network in an environment in which at least two or more heterogeneous networks are overlaid. A multi-mode terminal provided; If a network selection request message is generated in response to receiving an outgoing signal from the multi-mode terminal, and the network selection response message received in response to the network selection request message includes a second access network as a recommended network, the multi-mode terminal A first access network requesting to retry the originating signal to the second access network; When the network selection request message is received from the first access network, the intelligent server, which stores information necessary for optimal network selection, requests and is provided with information necessary for optimal network selection, and receives the optimal information provided from the intelligent server. Selecting an optimal network that can provide a service to be used by the multi-mode terminal based on information necessary for network selection, preferred access network information of the terminal user and service information, and selecting information on the selected network. It is preferably made to include a network selection server to be included in the selection response message and transmitted to the first access network.

Meanwhile, an access network selection system in a multi-mobile communication network environment according to another embodiment of the present invention is a multi-mode terminal selectively wirelessly connected to any one network in an environment in which at least two or more heterogeneous networks are overlaid. Wow; When a location registration request is received from the multi-mode terminal that is wirelessly connected and receives a service, a network selection request message is generated, and the second access network is included as a recommended network in the network selection response message received in response to the network selection request message. A first access network requesting the multi-mode terminal to handoff to the second access network, if present; When the network selection request message is received from the first access network, the intelligent server, which stores information necessary for optimal network selection, requests and is provided with information necessary for optimal network selection, and receives the optimal information provided from the intelligent server. Selecting an optimal network capable of providing a service used by the multi-mode terminal on the basis of information necessary for network selection, access network information to which the multi-mode terminal is wirelessly connected, and service information used; It is preferably made to include a network selection server to be included in the network selection response message and sent to the first access network.

On the other hand, the access network selection method in a multi-mobile communication network environment according to an embodiment of the present invention, when the first access network receives the incoming signal from the multi-mode terminal according to the preference of the terminal user, the network to the network selection server Transmitting a selection request message; Requesting and receiving information necessary for optimal network selection from the network selection server receiving the network selection request message to an intelligent server; Selecting an optimal network capable of providing a service to be used by the multi-mode terminal based on the information provided from the intelligent server, the preferred access network information of the terminal user, and the use service information; Including information about the selected network in a network selection response message and transmitting the information to the first access network; If the network recommended by the network selection server is the same network as the first access network by analyzing the network selection response message in the first access network, the call signal processing is continued, and the network recommended by the network selection server is the first network. If the second access network is not the same as the access network, requesting the multi-mode terminal to retry the outgoing signal to the second access network; Preferably, the multi-mode terminal includes a step of retrying a call signal to the second access network according to the call signal retry request.

On the other hand, in the multi-mobile communication environment according to another embodiment of the present invention, the access network selection method, when the first access network providing a service to the multi-mode terminal that is wirelessly connected receives a location registration from the multi-mode terminal, Transmitting a network selection request message to a selection server; Requesting and receiving information necessary for optimal network selection from the network selection server receiving the network selection request message to an intelligent server; Selecting an optimal network capable of providing a service used by the multi-mode terminal based on information provided from the intelligent server, access network information to which the multi-mode terminal is wirelessly connected, and service information used; Including information about the selected network in a network selection response message and transmitting the information to the first access network; If the network recommended by the network selection server is the same network as the first access network by analyzing the network selection response message in the first access network, the location registration procedure is continued, and the network recommended by the network selection server is the first access network. Requesting handoff to the second access network from the multi-mode terminal when the access network is not the same as the second access network; Preferably, the multi-mode terminal includes a handoff request to the second access network in response to the handoff request.

An access network selection system and method in a multi-mobile communication network environment according to the present invention provides an optimal network in which a terminal can be efficiently provided on the network side in consideration of user preferences, using services, user location information, and network conditions. By selecting, the terminal can be provided with the service through the optimal network.

Hereinafter, an access network selection system and method in a multi-mobile communication network environment according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a road illustrating an example of a configuration of an access network selection system in a multiple mobile communication network environment according to an embodiment of the present invention. In the embodiment of the present invention, a case in which a WCDMA network and a WIBRO network are overlaid will be described as an example. Shall be. However, the environment in which the present invention can be implemented is not limited to the case where the WCDMA network and the WIBRO network are overlaid, and the access network selection system in the multiple mobile communication network environment according to the present invention is CDMA 2000, WIBRO, WCDMA, BcN ( It is revealed that various mobile communication networks such as Broadband Convergence Network (WLAN), Wireless Local Area Network (WLAN), and High Speed Downlink Packet Access (HSDPA) can be applied in all overlaid environments.

In FIG. 1, the terminal 10 is a multi-mode terminal that is selectively wirelessly connected to a WCDMA network and a WIBRO network to receive a service. When an attempt is made to make a call according to a request of a terminal user, the terminal 10 is a network preset according to a terminal user's preference. After making an outgoing call to a selected network (eg, a WCDMA network) according to the access order, requesting to redial a call from the network selection server 70 to another network (eg, a WIBRO network) through the attempted call. When the request is sent, the call is retried to the network that is recommended to be resent (e.g., the WIBRO network).

In addition, the terminal 10 performs location registration to a network that is currently wirelessly connected periodically or in accordance with a movement while receiving a service from a network that is currently wirelessly connected (for example, a WIBRO network). When a request is received from the network selection server 70 to another network (for example, a WCDMA network) through an attached network, a handoff is performed to a network (for example, a WCDMA network) recommended for handoff. request.

In FIG. 1, the WCDMA network 20 is a Node-B 21 as a base station for wireless section communication with the terminal 10 and a Radio Network Controller (RNC) 23 for controlling the plurality of Node-Bs 21. ), The MSC (Mobile Switching Center) 25 connected to the RNC 23 to perform a call exchange to provide a voice call service to the terminal 10, and the location of the terminal 10 connected to the RNC 23. Serving GPRS Support Node (SGSN) 27, which maintains tracks and performs access control and security functions, and Gateway GPRS Support Node (GGSN), which provides packet data services to GPRS network subscribers through connection with SGSN 27 ( 29).

When the terminal 10 attempts to make an outgoing call to the WCDMA network 20 described above, the system 10 selects one of the systems RNC, MSC, SGSN constituting the WCDMA network 20 to the network selection server 70. Generates and transmits a network selection request message, analyzes the network selection response message received from the network selection server 70, and then recommends the same WCDMA as the network that the terminal 10 recommended by the network selection server 70 attempts to originate. In the case of a network, the call signal processing is continued, and if the network recommended by the network selection server 70 is not the same as the network to which the terminal 10 attempts to make a call (for example, a WIBRO network), the terminal In step (10), the network selection server 70 requests to retry the originating call to the network recommended.

The above-described network selection request message preferably includes access network information preferred by the terminal user, service information intended to be used by the terminal user, identification information of the terminal 10 which attempts to make a call.

In addition, when a location registration request is received from the terminal 10 that is wirelessly connected to the WCDMA network 20 and is provided with a service, the network may be configured in any one of the systems (RNC, MSC, SGSN) constituting the WCDMA network 20. The network selection request message is generated and transmitted to the selection server 70, the network selection response message received from the network selection server 70 is analyzed, and the network terminal 10 recommended by the network selection server 70 is currently serviced. If the WCDMA network is the same as the network that is being provided, continue with the location registration procedure, and the network recommended by the network selection server 70 is not the same as the network where the terminal 10 is currently receiving service (for example, For example, in case of a WIBRO network, the terminal 10 requests the terminal 10 to hand off to the network recommended by the network selection server 70.

The above-described network selection request message may include access network information that the terminal 10 is currently wirelessly connected to and receives a service, service information that the terminal user is currently using, identification information of the terminal 10 that requests location registration, and the like. desirable.

As described above, in the embodiment of the present invention, when the terminal 10 receives the attempted call or location registration, the network selection request message is transmitted to the network selection server 70, and the network selection server 70 selects the network. A function of receiving a response message and requesting reconnection or handoff to another network to the terminal 10 as described above is described as being in charge of any one of the systems constituting the WCDMA network 20, but is separately implemented. The device may be in charge of an existing device (eg, a network selection relay device), and a separately implemented device may be installed between the RNC 23 and the MSC 25 or the SGSN 27.

Meanwhile, the WIBRO network 30 provides a connection function with the terminal 10, manages radio resources, supports handoff of the terminal 10, and performs a RAS (Radio Access Station) as a base station that performs authentication and security functions. 31) and an access control router (ACR) 33 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.

When the terminal 10 attempts to make an outgoing call to the WIBRO network 30 described above, a network selection request message is generated and transmitted from the system (ACR) constituting the WIBRO network 30 to the network selection server 70. If the network recommended by the network selection server 70 is the same WIBRO network that the terminal 10 attempts to make a call from, the network selection response message received from the network selection server 70 is analyzed. If the network recommended by the network selection server 70 is a network that is not the same as the network to which the terminal 10 attempts to make a call (for example, a WCDMA network), the network selection server 70 is connected to the terminal 10. Requests retry with the network recommended in

In addition, when a location registration request is received from the terminal 10 that is wirelessly connected to the WIBRO network 30 and receives the service, the network selection request from the system (ACR) constituting the WIBRO network 30 to the network selection server 70 is performed. Generates and sends a message, analyzes the network selection response message received from the network selection server 70, and recommends that the network recommended by the network selection server 70 is the same WIBRO network as the network where the terminal 10 is currently receiving service. In the case where the location registration procedure is continued, and if the network recommended by the network selection server 70 is not the same network as the terminal 10 is currently receiving the service (for example, WCDMA network), The terminal 10 requests the handoff to the network recommended by the network selection server 70.

As described above, in the embodiment of the present invention, when the terminal 10 receives the attempted call or location registration, the network selection request message is transmitted to the network selection server 70, and the network selection server 70 selects the network. Although a function of receiving a response message and requesting reconnection or handoff to another network to the terminal 10 is described as being in charge of the system configuring the WIBRO network 30, a device separately implemented (for example, For example, a network selection relay device) may be in charge, and a separately implemented device may be installed on the top of the ACR 33.

As described above, the WCDMA network 20 and the WIBRO network 30 are connected through the IP backbone network 40, and when the terminal 10 changes the connection from the WCDMA network to the WIBRO network, it exchanges necessary messages.

On the other hand, when the network selection server 70 receives an outgoing call attempted by the terminal 10 or receives a network selection request message from a network (for example, a WCDMA network) that is requested to register a location from the terminal 10, An intelligent server 80 that bundles and manages various data together to select and assign an optimal network to a terminal user. Information necessary for selecting an optimal network, for example, is applied to all networks accessible from the current location of the terminal 10. Information, network coverage information, performance that can be provided in each network, current status information of each network (network load ratio), performance of terminal, plan, subscriber location information (moving speed, current location, average time staying in current location, current location) The type of service mainly used in the service provider) and the terminal user included in the information and network selection request message provided from the intelligent server 80 Based on the preferred access network information (or access network information to which the terminal is currently wirelessly connected) and the service information used, the terminal selects an optimal network that can provide a service to be used by the terminal 10 and selects network information on the selected network. Include the response message and send the network selection request message to the transmitting network.

The intelligent server 80 is a server that bundles and manages various data distributed in various places, for example, network-based information and personalized information of each subscriber, and optimally according to a request of the network selection server 70. Provide the information needed to make a selection.

2 and 3 are process diagrams illustrating a method for selecting an access network in a multi-mobile communication network environment according to an embodiment of the present invention. FIG. 2 is a diagram illustrating an optimal access network for a terminal 10 that attempts to make a call. 3 is a flowchart illustrating an example in which an optimal access network is selected and provided to a terminal 10 currently receiving a service.

First, as shown in FIG. 2, a terminal 10 is configured in accordance with a terminal user's preference according to a terminal user's request for receiving a voice call service or a data service (for example, a WCDMA network). Attempting to make a call using the network call (S10), the network selection server 70 in the network system (for example, any one of the RNC, MSC, SGSN, network selection relay device) receiving the call signal from the terminal 10 The network selection request message is transmitted (S12).

The network selection request message transmitted to the network selection server 70 in step S12 includes access network information preferred by the terminal user, service information to be used by the terminal user, and identification information of the terminal 10 attempting to make a call. do.

The network selection server 70 receiving the network selection request message through the process S12 provides the intelligent server 80 with information necessary for optimal network selection to provide the optimal network to the terminal 10 that attempted to make the call. Request (S14).

When the network selection server 70 requests information necessary for optimal network selection to the intelligent server 80 in step S14, it is preferable to transmit the identification information of the terminal 10 to the intelligent server 80 together.

The intelligent server 80, which has received the information necessary for the optimal network selection from the network selection server 70 through the process S14, uses information on all the networks accessible from the current location of the terminal 10 using the terminal identification information. , Coverage information by network, performance that can be provided in each network, current status information of each network (network load ratio), terminal performance, plan, subscriber location information (moving speed, current location, average time staying in current location, mainly in current location) Service type, etc. to be used), and the like is transmitted to the network selection server 70 (S16).

The network selection server 70 that has received the information necessary for the optimal network selection from the intelligent server 80 through the above process S16 may include information about the terminal user included in the information and the network selection request message provided from the intelligent server 80. Using the preferred access network information and the service information to be used by the terminal user, the terminal 10 selects an optimal network that can provide the service to be used (S18), and the information about the selected network is included in the network selection response message. It includes and transmits the network selection request message to the network system through the process S12 (S20).

In step S18, when the terminal 10 attempts an outgoing call to the WCDMA network according to the terminal user's preference in order to receive the data service, the network selection server 70 may access the WCDMA and WIBRO networks. When the BcN network exists, the subscriber stays at the current location without moving, and there is a load on the WCDMA network, the WIBRO network can be selected as the optimal network.

The network system receiving the network selection response message from the network selection server 70 through the process S20 analyzes the network selection response message, and attempts to make a call by the network terminal 10 recommended by the network selection server 70. In the case of the same network as the network (for example, a WCDMA network), the call signal processing is continued (S22, S24), and the network recommended by the network selection server 70 is connected to the network that the terminal 10 attempts to call. If the network is not the same (for example, a WIBRO network), the terminal 10 requests the network 10 to retry an outgoing call to the network recommended by the network selection server 70 (S26).

The terminal 10, which has been requested to retry the calling signal through the process S26, retries the calling signal to the network (for example, a WIBRO network) recommended by the network selection server 70 according to the calling signal retry request. (S28).

On the other hand, as shown in Figure 3, as the terminal 10 moves in a state in which the terminal 10 is currently receiving a service from a network (for example, a WIBRO network) that is currently wirelessly connected, or periodically, the terminal. 10 performs location registration with a wirelessly connected network (S30, S32).

The process S32 transmits the network selection request message to the network selection server 70 from the network system (for example, ACR or network selection relay device) that is requested to register the location from the terminal 10 (S34).

In the process S34, the network selection request message transmitted to the network selection server 70 includes the access network information that the terminal 10 is currently wirelessly connected to and receives the service, the service information that the terminal user is currently using, and the terminal requesting location registration. Identification information (10) and the like.

The network selection server 70 receiving the network selection request message through the process S34 provides information required for optimal network selection to the intelligent server 80 in order to provide the optimal network to the terminal 10 attempting to make the call. Request (S36).

When the network selection server 70 requests information necessary for optimal network selection to the intelligent server 80 in step S36, it is preferable to transmit the identification information of the terminal 10 to the intelligent server 80 together.

The intelligent server 80, which has received the information necessary for the optimal network selection from the network selection server 70 through the process S36, uses information on all the networks accessible from the current location of the terminal 10 using the terminal identification information. , Coverage information by network, performance that can be provided in each network, current status information of each network (network load ratio), terminal performance, plan, subscriber location information (moving speed, current location, average time staying in current location, mainly in current location) Service type, etc. to be used), and the like is transmitted to the network selection server 70 (S38).

The network selection server 70 which has received the information necessary for the optimal network selection from the intelligent server 80 through the above-described process S38 is the information provided from the intelligent server 80 and the current access network information included in the network selection request message. Using the service information currently used by the terminal user, the terminal 10 selects an optimal network capable of providing a service currently being used (S40), and includes information on the selected network in a network selection response message. In step S34, the network selection request message is transmitted to the network system having transmitted the signal (S42).

When the network selection server 70 performs location registration as the terminal 10 is currently connected to the WIBRO network and moves while receiving data service, the network selection server 70 provides a WCDMA network that is accessible from the subscriber's current location. When there are WIBRO and BcN networks, and the subscriber is moving at a speed of 50 km / h, the WCDMA network capable of moving and receiving data service can be selected as an optimal network.

The network system receiving the network selection response message from the network selection server 70 through the process S42 analyzes the network selection response message, and the network terminal 10 recommended by the network selection server 70 is currently wirelessly connected. In case of the same network as the network receiving the service (for example, the WIBRO network), the location registration procedure is continued (S44, S46), and the network recommended by the network selection server 70 is determined by the terminal 10. In the case of a network that is not the same as the network that is being provided with the wireless service (for example, a WCDMA network), the terminal 10 requests the terminal 10 to hand off to the network recommended by the network selection server 70 (S48). .

Upon receiving the handoff request through the process S48, the terminal 10 requests a handoff to the network (for example, the WCDMA network) recommended by the network selection server 70 according to the handoff request (S50).

The access network selection system and method in the multiple mobile communication network environment of the present invention are not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea of the present invention.

According to the present invention, in all environments in which various mobile communication networks are overlaid, an optimal network in which a terminal can be efficiently provided in consideration of a user's preferences, using services, user location information, and network conditions on the network side is provided. By selecting, the terminal can be provided with the service through the optimal network.

1 is a diagram illustrating a configuration of an access network selection system in a multiple mobile communication network environment according to an embodiment of the present invention.

2 and 3 are process diagrams for explaining a method of selecting an access network in a multiple mobile communication network environment according to an embodiment of the present invention.

*** Explanation of symbols for the main parts of the drawing ***

10. terminal, 20. WCDMA network, 21. node-B,

23.NCN, 25.MSC, 27.SGSN,

29.GGSN, 30.WIBRO Network, 31.RAS,

33.ACR, 40.IP backbone network, 60.Internet,

70. Network selection server, 80. Intelligent server

Claims (11)

A multi-mode terminal which is selectively wirelessly connected to any one network and provided with a service in an environment in which at least two heterogeneous networks are overlaid; In response to the outgoing call from the multi-mode terminal that is being wirelessly connected and receiving the service, a network selection request message is generated, and the second access network is recommended to the network selection response message received in response to the network selection request message. A first access network requesting the multi-mode terminal to retry the originating signal to the second access network, if included; When the network selection request message is received from the first access network, the intelligent server, which stores information necessary for network selection, is requested and provided with information required for network selection, and the information necessary for the network selection provided from the intelligent server is received. And selecting a network capable of providing a service to be used by the multi-mode terminal based on preferred access network information and service information of a user of the terminal, and including information on the selected network in the network selection response message. A network selection system in a multiple mobile communication network environment including a network selection server for transmitting to a network. The network selection request message of claim 1, An access network selection system in a multiple mobile communication network environment comprising terminal user preferred access network information, use service information, and terminal identification information. A multi-mode terminal which is selectively wirelessly connected to any one network and provided with a service in an environment in which at least two heterogeneous networks are overlaid; When a location registration request is received from the multi-mode terminal that is wirelessly connected and receives a service, a network selection request message is generated, and the second access network is included as a recommended network in the network selection response message received in response to the network selection request message. A first access network requesting the multi-mode terminal to handoff to the second access network, if present; When the network selection request message is received from the first access network, the intelligent server, which stores information necessary for network selection, is requested and provided with information required for network selection, and the information necessary for the network selection provided from the intelligent server is received. And selecting a network capable of providing a service used by the multi-mode terminal based on access network information and usage service information to which the multi-mode terminal is wirelessly connected, and including information on the selected network in the network selection response message. Access network selection system in a multiple mobile communication network environment comprising a network selection server for transmitting to the first access network. The method of claim 3, wherein the network selection request message, An access network selection system in a multiple mobile communication network environment, comprising access network information, use service information, and terminal identification information connected wirelessly. The network of claim 1 or 3, wherein the first access network transmits the network selection request message to the network selection server in response to receiving an outgoing signal from the multi-mode terminal or requesting a location registration. And a device for requesting access to the second access network from the multi-mode terminal if the second access network is included as a recommended network in the network selection response message received from the access network. Choice system. The method of claim 1 or 3, wherein the information required for selecting the network is Access network selection system in a multi-mobile network environment, characterized in that comprises a information and rate plan for the network accessible from the current location of the multi-mode terminal. The method of claim 6, wherein the information required for selecting the network is Network-specific coverage information; Performance available in each network; Current status information of each network including network load rate; Performance of the multi-mode terminal; And at least one of subscriber location information. When a network selection request message is received from a first access network that has received outgoing signals and location registrations from a multi-mode terminal connected to a wireless network, it requests and provides information necessary for network selection to an intelligent server that stores information necessary for network selection. And a service provided by the multi-mode terminal based on information required for the network selection received from the intelligent server and access network information and use service information to which the multi-mode terminal included in the network selection request message is wirelessly connected. A network selection server for selecting a capable network and including information on the selected network in a network selection response message and transmitting the information to the first access network. Transmitting a network selection request message to a network selection server when a first access network providing a service to a multi-mode terminal that is wirelessly connected receives one of an origination signal and a location registration from the multi-mode terminal; For the network selection request message from the network selection server for selecting a network based on one of the preferred access network information of the terminal user and the access network information to which the multi-mode terminal is wirelessly connected, the information required for network selection, and the use service information. Receiving a network selection response message as a response; If the network recommended by the network selection server is the same network as the first access network by analyzing the network selection response message, processing of outgoing call or location registration received from the multi-mode terminal is continued, and the network selection server is recommended. If one network is a second access network that is not the same as the first access network, the access network in a multi-mobile communication network environment comprising the step of requesting the multi-mode terminal to retry or hand off an outgoing signal to the second access network. How to choose. Receiving, by the network selection server, a network selection request message from a first access network that receives an outgoing call or a location registration from a multi-mode terminal connected wirelessly; Requesting and receiving information necessary for network selection from an intelligent server according to the reception of the network selection request message; Selecting a network based on one of a preferred access network information of a terminal user and access network information to which the multi-mode terminal is wirelessly connected, information required for selecting a network, and use service information; The information about the selected network is included in a network selection response message and transmitted to the first access network. If the selected network is the same network as the first access network, the first access network continues to process the call signal or location registration. And if the network is a second access network that is not the same as the first access network, requesting the multi-mode terminal to retry or hand off an outgoing signal from the first access network to the second access network. How to choose network in. The method of claim 9 or 10, wherein the network selection request message, And access service information and terminal identification information of the preferred access network information of the terminal user and the access network information to which the multi-mode terminal is wirelessly connected.

Images