KR101044945B1 - Method of sending information on the handover from information server to mobile node, information server therefor, and computer readable recording medium having embodied thereon a computer program for executing the method - Google Patents

Abstract

A method of setting an internet protocol address, an information storage medium recording a data format of a message therefor, and an information server are disclosed. In the method of setting an Internet protocol (IP) address according to the present invention, an information server (IS) transmits information on a method of setting an Internet protocol (IP) address of a new network after a handover to a mobile node. The mobile terminal performs the Internet Protocol (IP) address setting using the Internet Protocol (IP) address setting method while accessing the new network. By attempting an address setting method that is not supported by the new network, unnecessary delays can be prevented from occurring, so that fast and efficient address setting can be achieved.

Description

A method of transmitting information on handover from an information server to a mobile terminal, an information server for this, and a computer-readable recording medium having recorded thereon a program for executing the method on a computer.Method of sending information on the handover from information server to mobile node, information server therefor, and computer readable recording medium having embodied thereon a computer program for executing the method}

1 is a block diagram showing the configuration of an Internet protocol address setting apparatus according to an embodiment of the present invention.

2 is a flowchart of a method of setting an internet protocol address according to an embodiment of the present invention.

3 is a diagram illustrating an example of a mobile communication environment in which an Internet protocol address is set according to the present invention.

4 is a diagram illustrating a network layer for performing Internet protocol address setting according to the present invention.

5a to 5c are diagrams illustrating an example of a data format of a message used in an internet protocol address setting method and apparatus according to the present invention.

<Explanation of symbols for main parts of the drawings>

1: mobile node (NM)

2, 3: Point of Attachment (PoA)

4: correspondent node (CN)

5, 6: information server (IS)

200: connection point Internet protocol setting method information element (PoA IP Configuration Methods IE)

210: type field

220: length field

230: Bitmap indicating how to set the access point Internet protocol

The present invention relates to a communication system, and more particularly, to a technique for obtaining an IP address of a mobile terminal through an information server.

Currently, the necessity of vertical handover is increasing due to the proliferation of various wireless environments. Vertical handover refers to handover between heterogeneous networks where the network before and after the handover uses heterogeneous technology.

Due to the different technologies used in the network, there are various Internet Protocol (IP) address setting methods used in various environments.

However, due to the different Internet protocol (IP) address setting methods according to such various environments, a lot of delay occurs in the process of newly setting the Internet protocol (IP) address when performing the handover.

An object of the present invention is to provide an internet protocol address setting method for minimizing a delay in setting an internet protocol (IP) address when performing handover in various environments.

Another object of the present invention is to provide an information server for providing information for setting an Internet Protocol (IP) address.

Another object of the present invention is to provide an information storage medium that records a data format of a message for acquiring information on a method for setting an Internet protocol address of a new network after handover in a mobile terminal.

In order to achieve the above technical problem, an Internet Protocol (IP) address setting method may include setting an Internet Protocol (IP) address of a new network after handover from an information server (IS) to a mobile node. And transmitting information on the method, wherein the mobile terminal performs the Internet Protocol (IP) address setting using the Internet Protocol (IP) address setting method while connecting to the new network.

An information server (IS) that provides information for setting an Internet Protocol (IP) address for achieving the above another technical problem is an Internet protocol of a new network after handover to a mobile node. (IP) an information transmitter for transmitting information on an address setting method, wherein the mobile terminal performs an Internet protocol (IP) address setting using the Internet protocol (IP) address setting method while accessing the new network. It is desirable to.

In order to achieve the above technical problem, an Internet Protocol (IP) address setting method may include obtaining information about an Internet Protocol (IP) address setting method of a new network after handover through an information server (IS). step; And performing Internet Protocol (IP) address setting with the Internet Protocol (IP) address setting method as a priority while the mobile terminal accesses the new network.

The information on a method of setting an Internet protocol (IP) address of the new network may include: information indicating whether the new network uses an Internet Protocol version 6: IPv6 address autoconfiguration method; And information indicating whether the new network uses a dynamic host configuration protocol version 6: DHCPv6 configuration.

The performing of the Internet Protocol (IP) address setting may include a Router Advertisement (RA) message to a router of the new network when the new network uses an Internet Protocol version 6 (IPv6) address autoconfiguration method. Transmitting a requesting Router Solicitation (RS) message; Receiving a Router Advertisement message from the router; And generating an Internet Protocol Version 6 (IPv6) address using the Internet Protocol Version 6 (IPv6) prefix included in the Router Advertisement message.

The performing of the Internet Protocol (IP) address setting may include: setting the Internet Protocol version to the Dynamic Host Configuration Protocol (DHCP) server of the new network when using the dynamic host configuration protocol version 6 (DHCPv6) configuration method in the new network. Requesting an 6 (IPv6) address; And receiving an Internet Protocol Version 6 (IPv6) address from the Dynamic Host Configuration Protocol (DHCP) server.

The information about the Internet Protocol (IP) address setting method of the new network may include information indicating whether the new network uses an Internet Protocol version 4: IPv4 static setting method; Information indicating whether the new network uses an Internet Protocol version 4 (IPv4) dynamic configuration scheme; And information indicating whether the new network uses the Internet protocol version 6 (IPv6) manual setting method.

Acquiring the information on the Internet Protocol (IP) address setting method of the new network, the bit corresponding to the Internet Protocol (IP) address setting method of the new network has a value of 1, and other Internet protocol (IP) The bit corresponding to the address setting method may include acquiring information on the Internet protocol (IP) address setting method by receiving data in a bitmap format having a value of 0 from the information server.

Preferably, the information on the method for setting an Internet Protocol (IP) address of the new network is one of an information element (IE) including information about the new network after the handover, and the Internet of the new network. The information about the protocol (IP) address setting method is preferably delivered in the form of a connection point Internet protocol setting method information element (PoA IP Configuration Methods IE).

The Internet Protocol (IP) address setting apparatus for achieving the technical problem, to obtain information about the Internet Protocol (IP) address setting method of the new network after the handover through the information server (IS) An IP address setting information receiver; And an IP address setting performing unit configured to perform Internet protocol (IP) address setting with the Internet protocol (IP) address setting method as a priority while the mobile terminal accesses the new network.

According to another aspect of the present invention, there is provided an information storage medium comprising: a field containing information indicating whether the Internet protocol version 6 (IPv6) address autoconfiguration method is used in the new network; And a field containing information indicating whether the new network uses a dynamic host configuration protocol version 6: DHCPv6 configuration method. Internet Protocol version 4: field containing information indicating whether to use IPv4) static configuration method; A field containing information indicating whether the new network uses an Internet Protocol version 4 (IPv4) dynamic configuration method; And a field containing information indicating whether the new network uses an Internet protocol version 6 (IPv6) manual configuration method.

Hereinafter, exemplary embodiments of an internet protocol address setting method and apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing the configuration of an Internet protocol address setting apparatus according to an embodiment of the present invention.

2 is a flowchart of a method for setting an internet protocol address according to an embodiment of the present invention.

Referring to FIG. 1, the Internet protocol address setting apparatus 100 according to an embodiment of the present invention includes an IP address setting information receiving unit 110 and an IP address setting performing unit 120.

1 and 2, an Internet protocol (IP) address setting method according to an embodiment of the present invention will be described.

First, the IP address setting information receiving unit 110 obtains information on an Internet Protocol (IP) address setting method of a new network after handover through an information server (IS) (S100).

The IP address setting unit 120 performs the Internet protocol (IP) address setting with the Internet protocol (IP) address setting method as the priority while the mobile terminal accesses the new network (S110).

In order to understand the operation of the present invention in detail, with reference to Figs. 3 and 4, an environment in which an Internet Protocol (IP) address setting according to the present invention is performed will be described.

3 is a diagram illustrating an example of a mobile communication environment in which an Internet protocol address is set according to the present invention.

Referring to FIG. 3, the mobile communication environment includes a mobile node (MN) 1, a plurality of points of attachment (PoAs) 2, 3, a correspondent node (CN 4), and an information server. (Information Servers: ISs, 5, 6), and a number of networks. Those skilled in the art will appreciate that the network topology shown in FIG. 3 may be configured in various ways.

The mobile node 1 is a mobile terminal using a mobile communication environment. When starting to use mobile communication, the mobile node 1 registers a home address (HoA) with a home agent on a home network. When the mobile node 1 moves to another network, it obtains a care of address (CoA) from a foreign agent (FA) that is an agent on the current network to which the mobile node 1 moves. The mobile node 1 sends the acquired CoA to the home agent for registration. The home agent associates the CoA with the HoA. This is called binding of addresses. When the mobile node 1 moves to another network and obtains a secondary address in that network, it passes back to the home agent. At this time, the previous binding of the home agent is canceled and the home address and the new auxiliary address are bound. This is called a binding update (BU).

In order to transfer data from the counterpart node 4 to the mobile node 1, the counterpart node 4 needs to know the address of the mobile node 1. Since the partner node 4 knows the HoA, it sets the HoA to the destination address and transmits the data. The data set by the HoA as the destination address is received by the home agent. Since the home agent knows the CoA corresponding to the HoA, it sets the CoA to the destination address and transmits the data. It is delivered to the mobile node 1 via the network.

A point of attachment (PoA) connects the mobile node 1 with the network. Examples of the access point may include an access point (AP), a base station (BS), and the like, but the present invention is not limited thereto, and the access point (PoA) may be used to transmit data between the mobile node 1 and the network. Can be.

Handover is performed in the process of moving the mobile node 1 to another network. For example, the handover process will be described with reference to FIG. 3. In FIG. 3, an example is shown in which the mobile node 1 is in a network area in which data communication is performed through a current connection point 2 and then moves to a network area in which data communication is performed through a new connection point 3. .

The mobile node 1 receives information about the new network and the connection point 3 in the network via the current connection point 2. Information about this new network and access point is received from information servers 5 and 6. In addition, when the current access point 3 serves as an information server, it may be directly transmitted from the current access point (3). The mobile node 1 may use the received information to know which network protocol is used in the new network, which services are supported, and may prepare in advance for this.

In this handover process, setting of a secondary address (CoA), which is an address used by the mobile node 1 in a new network, is very important. In the address setting method according to the present invention, information about an address setting method in a new network is obtained in advance from information servers, and Internet protocol (IP) address setting is performed with the received address setting method as a priority.

If the address setting method according to the present invention is not followed, the address setting method in the new network is not known in advance, and thus a process of negotiating address setting with the access point 3 in the new network is necessary. For example, the mobile node 1 receives a Router Advertisement (RA) message or the like from the access point 3 and extracts an Internet Protocol version 6 (IPv6) prefix therefrom. Try to. However, if the new network does not support the Internet Protocol Version 6 (IPv6) prefix, then the mobile node 1 does not use the Internet Protocol Version 6 (IPv6) prefix and does not use the addressing scheme, for example, the dynamic host configuration protocol ( Dynamic Host Configuration Protocol (DHCP) must be used to set the address. In such a case, there is a delay caused by sending and receiving an unnecessary message.

4 is a diagram illustrating a network layer for performing Internet protocol address setting according to the present invention. Referring to FIG. 4, the network layer of the mobile node includes a lower layer 10, a handover function layer 20, and an upper layer 30.

The lower layer 10 refers to the second and lower layers of the seven layers defined by the Open Systems Interconnection (OSI) reference model, that is, a link layer, a physical layer, and the like. The lower layer may support various network specifications, as shown in FIG. For example, one or more of a wireless local area network (WLAN), a general packet radio service (GPRS), a third generation partnership project (3GPP), and the like may be supported.

The upper layer 30 is the third and higher layers of the seven layers defined by the OSI reference model, that is, the Internet Protocol (IP) layer, the mobile IP layer, the transport layer, and the application. ) Means a hierarchy.

The handover function layer 20 supports handovers in the lower layer 10 and the upper layer 30. The handover function layer 20 is a layer not defined in the OSI reference model, and corresponds to the 2.5th layer between the lower layer 10 and the upper layer 3.

The handover function layer 20 supports handover between heterogeneous links independently of the media type of the link to which the mobile node 1 connects. That is, the handover function layer 20 supports handover between heterogeneous links independently of the type of link interface supported by the lower layer 10.

Referring to FIG. 4, the handover functional layer 20 includes an event service module 22, an information service module 24, and a command service module 26.

The event service module 22 detects the occurrence of an event related to handover between various links in the mobile node 1 and reports the occurrence of this event to the upper layer 30. In more detail, the event service module 22 requests the mobile node 1 to register the counterpart node 4 in order to receive the occurrence of such an event, and then the mobile node 1 is registered with the counterpart node 4. The occurrence of this event is detected by receiving a message from 1) indicating the occurrence of this event.

The information service module 24 collects and manages information on handovers between heterogeneous links by the mobile node 1 from the information servers 5 and 6 or from the access point, which serves as an information server. Obtains information about handover between heterogeneous links.

The command service module 26 controls the handover in the lower layer 10, that is, the handover in the link layer, according to commands input from the upper layer 30, for example, commands input by a user.

The apparatus and method for setting an Internet Protocol (IP) address according to the invention is particularly concerned with the information service module 24. The information service module 24 receives information about the new network in the form of an information element (IE), and uses the information to determine the environment of the new network.

The IP address setting receiver 110 according to the present invention is preferably included in the information service module 24. However, the present disclosure is not limited to this example and may be configured separately from the information service module 24.

Upon knowing that the mobile terminal 1 is moving to the new network, the mobile terminal 1 requests information server 5, 6 for the new network. The information server IS sends information about the new network in the form of information elements.

5a to 5c are diagrams illustrating an example of a data format of a message used in an internet protocol address setting method and apparatus according to the present invention.

5A is a diagram illustrating an example of an information element (IE) exchanged between the information service module 24 and the information servers 5 and 6.

Referring to FIG. 5A, the information server 5, 6 transmits various information elements (IEs), in particular the method of access point Internet protocol setting information which includes information on the method of setting an access point Internet Protocol (IP) address ( PoA IP Configuration Methods IE, 200).

5B is a diagram illustrating an example of a connection point Internet protocol configuration method information element (PoA IP Configuration Methods IE, 200).

The access point internet protocol setting method information element 200 includes a type field 210 indicating that the information element is an access point internet protocol setting method information element, a field 220 indicating the length of the information element, and an internet protocol (IP) of the new network. ), A field 230 indicating information on an address setting method.

Information on how to set up an Internet Protocol (IP) address for a new network is preferably presented in bitmap format.

FIG. 5C illustrates an example of information on a method of setting an Internet protocol (IP) address of a new network in a bitmap format.

In the example of FIG. 5C, as an example of a method of setting an Internet protocol (IP) address of a new network, Internet Protocol version 4 (IPv4) static setting method, Internet Protocol version 4 (IPv4) dynamic setting method, and Internet Protocol version 6 (Internet Protocol version 6: IPv6) address autonomous setting method (also known as IPv6 stateless address setting method), Dynamic Host Configuration Protocol version 6: DHCPv6 setting method (this is called IPv6 stateful address setting Method), Internet protocol version 6 (IPv6) manual configuration method, and the like.

Each addressing scheme corresponds to each bit (bits 0, 1, 11, 12, 13, etc.), and the remaining bits correspond to other addressing schemes of Internet Protocol version 4 (IPv4) or other protocols of Internet Protocol version 6 (IPv6). Bit assignments may be reserved to indicate the addressing scheme.

In addition, part of the address setting method shown in FIG. 5C, for example, the Internet protocol version 6 (IPv6) address autonomuos setting method and the dynamic host setting protocol version 6 (DHCPv6) setting method corresponding to bit 11 and bit 12, respectively. Can only be used for

It is also possible to make the bit designation order of the address setting method shown in Fig. 5C in a different order.

The mobile node 1 and the information servers 5 and 6 know in advance the type of the address setting method and the bit designation order to be included in the access point Internet protocol setting method information element (PoA IP Configuration Methods IE, 200). Among the bits, the bit corresponding to the Internet Protocol (IP) address setting method of the new network has a value of 1, and the bit corresponding to the other address setting method has a value of 0.

By expressing the address setting method in the form of a bitmap as described above, the amount of data to be transmitted can be reduced, thereby reducing network traffic.

Hereinafter, the process of performing address setting while accessing a new network by using an Internet protocol (IP) address setting method of a new network received from an information server (IS) will be described in detail.

The mobile node 1 expects to use the IPv6 address autoconfiguration method in a new network, and can perform Internet protocol (IP) address setting with this priority. In most cases, the information servers 5, 6 know exactly the information about the address setting method used in the new network. Therefore, in this case, unnecessary delay caused by trying another address setting method can be avoided.

If the address setting method supported by the new network is changed but the information is not updated in the information server 5 or 6, or if the address setting method supported by the new network cannot be supported for some reason, the actual new network There may be a difference between the supported address setting method and the information obtained from the information server. In this case, a delay may occur when an address is set based on information obtained from the information server. However, this case rarely occurs, so the delay by such a case will be very small.

Let's take a look at the case where the Internet Protocol (IP) address setting method of the new network is the IPv6 address setting method. This corresponds to the case where bit 11 has a value of 1 and other bits have a value of 0 in FIG. 5C.

In this case, the IP address setting unit 120 preferentially performs the automatic address setting method. First, while accessing a new network, the IP address setting performing unit 120 transmits a Router Solicitation (RS) message to a router of a new network. The Router Solicitation (RS) message is a request for sending a Router Advertisement (RA) message to the router.

Router Advertisement messages contain an IPv6 prefix.

The IP address setting unit 120 receives a Router Advertisement message from the router and generates an IPv6 address using an IPv6 prefix included in the Router Advertisement message.

When using the DHCPv6 configuration method in the new network, the IP address setting unit 120 requests an IPv6 address from the DHCP server while accessing the new network. At this time, for example, a DHCPDISCOVER message is used.

 The DHCP server sends an IPv6 address using, for example, a DHCPOFFER message or a DHCPACK message. The IP address setting unit 120 receives an IPv6 address from a DHCP server and sets it as an IPv6 address in a new network.

The address setting method in the case of using the IPv4 static setting method, the IPv4 dynamic setting method, or the IPv6 manual setting method in the new network has a general knowledge in the technical field to which the present invention belongs at the technical level at the time of filing. Since everyone knows it, the description is omitted.

The mobile terminal 1 using the Internet Protocol (IP) address setting method according to the present invention quickly uses the information on the Internet Protocol (IP) address setting method of the new network received from the information server (IS) to quickly access the network to be connected. You can decide.

Even if the mobile terminal 1 is located in the same physical area, there may be a case where it can be connected to several network areas. For example, the mobile terminal 1 may be connected to both a network using an IPv6 automatic address setting method (a network A) and a network using a DHCPv6 setting method (network B).

At this time, consider an example in which a mobile terminal that does not use the Internet Protocol (IP) address setting method according to the present invention supports only the DHCPv6 setting method. If the mobile terminal attempts to connect to network A first, the mobile terminal 1 will fail to connect and try to connect to network B again. This causes an unnecessary delay.

In the case of using the Internet Protocol (IP) address setting method according to the present invention, the mobile terminal 1 receives information on the IP address setting method used for each of the networks (networks A and B) currently accessible from the information server. It is possible to determine in advance which network to connect to.

For example, when the mobile terminal 1 is a mobile terminal that supports only the DHCPv6 setting scheme as in the above example, the mobile terminal 1 can directly connect to the network B without unnecessarily attempting to connect to the network A.

The present invention can be embodied as code that can be read by a computer (including all devices having an information processing function) in 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 devices include ROM, RAM, CD-ROM, magnetic tape, floppy disks, optical data storage devices, and the like.

It is also possible to record the data format of the message used in the present invention on an information storage medium.

Although the foregoing description has been focused on the novel features of the invention as applied to various embodiments, those skilled in the art will appreciate that the apparatus and method described above without departing from the scope of the invention. It will be understood that various deletions, substitutions, and changes in form and detail of the invention are possible. Accordingly, the scope of the invention is defined by the appended claims rather than in the foregoing description. All modifications within the scope of equivalents of the claims are to be embraced within the scope of the present invention.

According to the Internet protocol address setting method according to the present invention, an information storage medium recording a data format of a message therefor, and an information server, information about an IP address setting method used in a new network is obtained in advance from an information server and is prioritized. By performing the IP address setting as a priority, an unnecessary delay is prevented by attempting an address setting method that is not supported by a new network, so that an effective and quick address setting can be made. In addition, by acquiring the IP configuration information used in the received peripheral network in advance, there is an effect that can determine in advance the network to be connected from among the available networks.

Claims (11)

In the information server (Information Server: IS), a method for transmitting information about the handover to a mobile node (mobile node), Transmitting, from the information server, information on a method of setting an Internet Protocol (IP) address of a new network after handover to the mobile terminal, Handover information, characterized in that the step of transmitting information on the Internet protocol (IP) address setting method of the new network after the handover to the mobile terminal is performed while the mobile terminal is connected to the network before the handover. Transmission method. The method of claim 1, wherein the information about the method of setting an Internet protocol (IP) address of the new network is: And one of an information element (IE) including information on a new network after the handover. The method of claim 1, The step of transmitting the information about the Internet Protocol (IP) address setting method of the new network after the handover to the mobile terminal, And transmitting an IP configuration method information element (IP configuration method IE) including information on an internet protocol (IP) address setting method of the new network to the mobile terminal. . In an information server (IS) for transmitting information about handover to a mobile node, And an information transmitter for transmitting information on an Internet Protocol (IP) address setting method of a new network after handover to the mobile terminal. And the information transmitting unit transmits information on the IP address setting method while the mobile terminal is accessing a network before handover. The method of claim 4, wherein the information about a method of setting an Internet protocol (IP) address of the new network is provided. And an information element (IE) including information on a new network after the handover. 5. The method of claim 4, The information transmission unit, And an Internet Protocol Configuration Method Information Element (IP Configuration Methods IE) including information about the Internet Protocol (IP) address setting method of the new network to the mobile terminal. A computer-readable recording medium having recorded thereon a program for causing a computer to execute a method for transmitting handover information from an information server (IS) to a mobile node, the method comprising: The handover information transmission method, Transmitting, from the information server, information on a method of setting an Internet Protocol (IP) address of a new network after handover to the mobile terminal, The step of transmitting information on a method of setting an Internet Protocol (IP) address of a new network after handover to the mobile terminal is performed while the mobile terminal is accessing a network before handover. Recordable media. The method of claim 7, wherein the information about a method of setting an Internet protocol (IP) address of the new network comprises: And one of an information element (IE) including information on a new network after the handover. The method of claim 7, wherein The step of transmitting the information about the Internet Protocol (IP) address setting method of the new network after the handover to the mobile terminal, And transmitting an IP configuration method information element (IP Configuration Methods IE) including information on an internet protocol (IP) address setting method of the new network to the mobile terminal. Recording media. delete delete

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