KR20080052298A - System for guarantying/maintaining mobility in next generation network and method thereof - Google Patents

Abstract

A system and a method for guarantying/maintaining mobility in an NGN(Next Generation Network) are provided to continue application service regardless of a change of location information of an NGN terminal by interacting the setting of a session only with identifier information. A connection information allocation unit(16) divides an IP address for ISP connection into identifier information and location information and allocates the divided information to an NGN terminal. A session setting unit(17) sets up a session for application service from an ISP by referring to only the identifier information. An interface selection/setting unit(211) selects one of the interfaces related to the location information, and sets up the connection setting to the ISP through the selected interface. An application service maintenance unit(212) sets up the new connection setting by selecting different interface related with the location information if a connectivity maintenance status error of the existing interface occurs.

Description

System for guarantying / maintaining mobility in Next Generation Network and Method etc.

The present invention relates to a mobility securing / maintenance system and a method thereof in a next generation network (NGN), and more specifically, to an IP (Internet Protocol) address used in the NGN, identifier information and location information ( The present invention relates to a system and method for securing and maintaining mobility to seamlessly maintain an application service through an NGN by separating into a locator.

NGN is expected to develop into an environment in which various network access networks such as wireless LAN, cellular network and Wibro are integrated as well as wired network. Therefore, NGN-based terminals (hereinafter referred to as 'NGN terminals') are required to support all access methods according to each network, and are required to be serviced in multiple interfaces and multiple ISP (Internet Service Provider) environments.

In addition, NGN must ensure continuous continuous service regardless of ISP network to which UE is connected. To this end, mobility must be maintained regardless of the connected network, and a multi homing function using multiple interfaces is required.

In order to maintain mobility, the mobile network must be accessible at all times, and to support multihoming, the ability to simultaneously connect to multiple ISPs is required. For this service, in order to maintain mobility in particular, a unique identifier of the NGN terminal is required. Currently, an IP address is assigned to the NGN terminal to serve as an identifier.

However, there are many vulnerabilities when treating the current IP address as an identifier of the NGN terminal. Especially, the current IP address allocation method focuses on the utilization in fixed network environment, and mobility consideration is not made deeply. In this case, the disconnection of the application service occurs, and it is a problem to apply it to NGN which maintains mobility as the core of application service regardless of the network environment.

The present invention was developed to meet the above background and to solve the above problems, and the object and technical problem of the present invention is to use the current IP address scheme in NGN, but with a slight change to the scheme NGN The present invention provides a system and method for securing and maintaining mobility through NGN by securing certainty of mobility in an infrastructure environment.

In order to embody the technical spirit of the present invention and to achieve the above object and technical problem, the mobility securing / maintaining system in the NGN disclosed herein is

A connection information allocating unit for dividing an IP address for the connection of an NGN terminal to be connected to a predetermined ISP into identifier information and location information related to the identifier information and assigning the IP address to the NGN terminal; A session establishment unit for setting a session for an application service from the ISP with reference to only the identifier information; An interface selection / setting unit for selecting one of the interfaces associated with the location information and establishing a connection to the ISP through the selected interface; And an application service maintenance unit for selecting a new interface by selecting another interface associated with the location information when an error occurs in real time by checking whether the connected interface is continuously connected in real time. To achieve.

In order to embody the technical spirit of the present invention and to achieve the above object and technical problem, the method of securing / maintaining mobility in NGN disclosed herein

(a) dividing an IP address for the access of an NGN terminal to be connected to a predetermined ISP into identifier information and location information related to the identifier information and assigning the IP address to the NGN terminal; (b) the transport layer establishing a session for an application service from the ISP by referring only to the identifier information; (c) the terminal selecting one of the interfaces associated with the location information and establishing a connection to the ISP through the selected interface; And (d) checking, by the terminal, whether the connectivity of the established interface is continued in real time to determine whether an error of the connectivity occurs; And (e) if the connectivity error occurs, the terminal selects another interface associated with the location information and establishes a new connection to the ISP to maintain the service. To achieve.

For the convenience of understanding, the core of the technical solution provided by the present invention will be presented first.

In the NGN environment, as mentioned above, the utilization of mobile terminals is expected to be higher than that of fixed terminals, and NGN is expected to be developed based on the All-IP network. In order to cope with this tendency and solve the above-mentioned problems, the core of the technical solution provided by the present invention is to divide an IP address including various functions into an identifier of a terminal and a location of the terminal. Allocating to the NGN terminal and establishing a session for an application service refers to only identifier information to ensure mobility of the NGN terminal.

According to the present invention, an NGN terminal that wants to access an ISP and receives an application service is allocated an IP address for the access by separating identifier information and location information in an upper transport layer and using only the identifier information for the application service. Since a session is set, a change in location information does not affect the already established session, thus enabling seamless application services.

That is, according to the present invention, since the establishment of the session for providing the application service by the ISP is associated only with the identifier information, the application service can be seamlessly maintained regardless of the change of the location information of the NGN terminal.

Hereinafter, the configuration of the invention for clarifying the technical spirit and technical solutions of the present invention will be described in detail with reference to the accompanying drawings, based on the embodiments of the present invention, the same configuration in giving reference numerals to the components of the drawings The elements have been given the same reference numerals even though they are in different drawings, and it is noted that in the description of the drawings, components of other drawings may be cited if necessary.

1 is a diagram showing the configuration of a network connection control unit in an NGN.

The network access control unit is a part in which the NGN terminal controls access to a predetermined ISP, and the home gateway control unit 11 in charge of home gateway control and the like manages all information related to the user and responds to the ISP connection request from the user. User profile processing unit 12 to perform, the authority and authentication performing unit 13 for setting and authenticating the access rights of the user, the access network access management unit 14 for managing access to the access network for the ISP connection , The access information allocator 16 for allocating (granting) an IP address to the connected NGN terminal and allocating identifier information such as DNS (Domain Name System) and proxy information and location information, and an access network of the NGN terminal. It consists of an identifier / location information processing unit 15 which links and manages identifier information and location information in itself.

A key part of the implementation of the present invention is the access information allocator 16, which specifically accesses an application service provided by an ISP to an NGN terminal accessing an access network for an ISP access. Necessary basic information, i.e., an IP address is assigned (assigned) to the NGN terminal, which includes both identifier information and location information in Layer 2 of the access network to which the NGN terminal is connected.

However, the connection information allocator 16 has no function of assigning and managing identifier information in the upper transport layer (Layer 4) to the assigned IP address when using the current IP (Internet Protocol). .

The session is set up based on the assigned IP address. The transport layer establishes a session by referring to the IP address in Layer 2. However, in case of the current IP, the transport layer cannot assign and manage identifier information independently, and because the current IP address has location information and identifier information at the same time, when the location information is changed ( That is, if the location of the NGN terminal is changed), the IP address itself is changed.

As mentioned above, the session for providing an application service is established based on the IP address, so if the IP address changes due to the change of the location information of the NGN terminal, the established session is disconnected and the service is disconnected. As a result, the implementation of a multi homing occurs.

Therefore, in order to prevent disconnection of the service, that is, to secure service continuity, the access information allocating unit 16 according to the present invention uses the IP address of the NGN terminal connected to the access network to the identifier information in the upper transport layer and accordingly. The session setting unit 17 separates and allocates location information, and the session setting unit 17 sets up a session for the service using only the identifier information in the transport layer. Even if it occurs, continuous service is possible.

That is, the purpose or necessity of separation is to finally associate the establishment of a session for providing a service with only identifier information and to allow the service to continue regardless of the change of the location information. This concept is now actively discussed and standardized by the Standardization Group (IETF HIP WG, Shim6 WG). The identifier information and the position information in the transport layer thus assigned are constructed by the identifier / position information processing unit 15 into a table indicating an association relationship between them.

On the other hand, the identifier / location information processing unit 15 manages the identifier information in the transport layer and the location information in association with each other and manages the state information. The identifier information and the location information processing unit 15 It constructs and manages the association table of location information, and responds to requests for delivery from both sources.

2 is a view showing the configuration of a preferred embodiment of the present invention.

As mentioned above, the NGN terminal will not be limited to only one access network, nor will it be used only in fixed networks. Therefore, the NGN terminal should be able to be connected to two or more networks at the same time and be implemented to be suitable for a multi-ISP environment. In addition, the NGN terminal should be provided with multiple interfaces instead of one to connect to one ISP.

In order to reflect such a function, the NGN terminal according to the present invention constructs a multi-interface support / management unit 21 for supporting and managing the above-described multi-interfaces. Section 212. The multi-interface support / management unit 21 is controlled by the user information management unit 22 in the NGN terminal.

The interface selection / setting unit 211 of the multi-interface support / management unit 21 selects one of the multiple interfaces to perform a connection setting with the ISP, and the application service maintenance unit 212 is a user information management unit ( For each ISP registered in 22), it checks in real time for each interface to connect to each ISP. If a problem occurs in one interface connected to the ISP providing the application service, the other connection with that ISP is performed. Manages the application service through the interface.

The user information manager 22 controls the multi-interface support / management unit 21 by storing and managing the ISP related information, the interface information with the ISP, and the location information in association with each other. Control the multi-interface support / management unit 21 through the control for.

Figure 3 illustrates a preferred embodiment of the present invention with reference to the drawings and Figure 2 will be described in more detail the operation of the present invention.

The NGN terminal accesses the access network for access to the ISP in order to receive an application service from a predetermined ISP (S31). For this purpose, the network access control unit shown in FIG. 1 for controlling access to an access network in an NGN environment is required, and in particular, the connection information allocator 16 shown in FIG. 1 is required for connection with an associated ISP through a connected interface. Do.

The access information allocator 16 allocates an IP address for each identifier information and location information of the NGN terminal and each interface for connection to the ISP (S32). At this time, the access information allocator 16 allocates the IP address of the NGN terminal connected to the access network by separating the identifier information in the upper transport layer and the position information related to the identifier information.

After allocation, the session setup unit 17 sets up a session for the service using only the identifier information. Specifically, session setup is performed by the transport layer (Layer 4) (S33). As such, identifier information is allocated to guarantee uniqueness in the network, but IP addresses (without identifier information) are allocated differently for each interface. The IP address thus allocated is stored in the user information manager 22 in association with the location information.

The interface selection / setting unit 211 of the multi-interface support / management unit 21 of the NGN terminal selects one of the multi-interfaces and establishes a connection with the ISP. The interface is associated with the location information corresponding to the identifier information. Any one of the interfaces is selected from the user information management unit 22 (S34) and the NGN terminal establishes a connection for receiving an application service through the selected interface (S35). The NGN terminal receives an application service from an ISP through a connected interface.

Meanwhile, the application service maintaining unit 212 of the multi-interface support / management unit 21 secures network accessibility for the remaining interfaces except the connected interface and checks in real time whether the connected interface remains connected (S36). If an error occurs in the connectivity (connection with the ISP in service) of the established interface, a new (other) interface for connection with the ISP is selected (S37), and a new connection is established (S38) to continue the current application service. To receive.

The present invention can also be embodied as computer readable code on a computer readable recording medium. The computer-readable recording medium includes all kinds of recording devices in which data that can be read by a computer system is stored.

Examples of computer-readable recording media include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, and the like, and may also be implemented in the form of a carrier wave (for example, transmission over the Internet). Include. The computer readable recording medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention.

Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the equivalent scope will be construed as being included in the present invention.

1 is a diagram showing the configuration of a network connection control unit in an NGN.

2 is a view showing the configuration of a preferred embodiment of the present invention.

FIG. 3 is a diagram illustrating a preferred embodiment of the present invention as showing a flow for implementing multihoming based on identifier in NGN.

Claims (2)

A connection information allocating unit for dividing an IP address for the connection of an NGN terminal to be connected to a predetermined ISP into identifier information and location information related to the identifier information and assigning the IP address to the NGN terminal; A session establishment unit for setting a session for an application service from the ISP with reference to only the identifier information; An interface selection / setting unit for selecting one of the interfaces associated with the location information and establishing a connection to the ISP through the selected interface; And Mobility in the NGN characterized in that it comprises an application service maintenance unit for real-time checking whether the connectivity of the established interface is connected and if there is an error in the connectivity, selecting another interface associated with the location information to establish a new connection; Acquisition / Maintenance System. (a) dividing an IP address for the access of an NGN terminal to be connected to a predetermined ISP into identifier information and location information related to the identifier information and assigning the IP address to the NGN terminal; (b) the transport layer establishing a session for an application service from the ISP by referring only to the identifier information; (c) the terminal selecting one of the interfaces associated with the location information and establishing a connection to the ISP through the selected interface; And (d) checking, by the terminal, whether the connectivity of the established interface is continued in real time to determine whether an error of the connectivity occurs; And (e) when the connectivity error occurs, the terminal selects another interface associated with the location information and establishes a new connection to the ISP to maintain the service, characterized in that the mobility in the NGN How to secure / maintain.

Images