KR100379225B1 - Agent routing system and method capable of prevailing mobile ip function - Google Patents

Abstract

The present invention relates to an agent routing system and a method for providing a mobile IP function, and more particularly, a mobile terminal (100) for performing communication with another mobile terminal after being authenticated after transmitting a registration request message; A home agent router that encapsulates an encapsulated registration request message, validates the original registration request message, updates the mobile binding list if valid, and transmits the valid registration response message using the encapsulated IP. 200); And when the registration request message is received from the mobile terminal 100, the mobile terminal 100 encapsulates the registration request message and transmits it to the home agent router 200, and then receives the valid registration response message from the home agent router 200. It is characterized by consisting of an external agent router 300 to transmit to), the present invention by using a mobile IP protocol to ensure the mobility of the host without changing the IP address in the Internet network at the same time providing a basic Internet working function Adding a Mobile IP feature provides a Mobile IP feature that allows the host to continue to provide services without changing the IP address even if the host moves to a new network.

Description

Agent routing system providing mobile IP function and method thereof {AGENT ROUTING SYSTEM AND METHOD CAPABLE OF PREVAILING MOBILE IP FUNCTION}

The present invention relates to an agent routing system and a method for providing a mobile IP (hereinafter referred to as " IP ") function, and more particularly, a host having mobility through its agent router in another network. The present invention relates to an agent routing system and a method for providing a mobile IP function that enables authentication of an IP from a home agent router.

As you may know, Mobile IP has recently exploded due to the explosive increase in web usage, and IP is overwhelming the International Standard Organization (ISO) family of international standards, becoming a de facto standard for international data network services, and PCS from Wireless Local Area Networks. As a variety of wireless (or mobile) communication services are being provided, ranging from personal communication services, the interest in combining these two services, ie, mobile Internet service, is increasing.

In short, mobile Internet is defined so that users can go anywhere and still receive Internet services such as web and e-mail through a wireless (or mobile) network connection. There are an infinite number of mobile Internet applications, but wireless computing is a prime example. Wireless computing means using a mobile terminal simply as the input / output terminal and performing complex calculations and application programs on a server elsewhere, making the terminal as light and inexpensive as possible. Wireless computing can be used to share or collaborate on the central computer's central processor unit (CPU) or expensive software within a university or corporate building. In particular, if a mobile terminal provides a multimedia interface including voice and video, it is possible to input voice commands, receive X-window, and receive video on demand (VOD).

In the future, mobile IP will continue to be important, and the influence of IMT (International Mobile Telecommunication) -2000 will be great. IMT-2000 is planned to provide Internet service, so the use of mobile IP is inevitable.

The host using the conventional Internet protocol has a fixed IP address and receives a fixed service in the Internet network. Therefore, if a host is moved to a new network, a new IP address must be assigned. In this case, not only will the existing transport layer connection be reset, but if the host is moved to the new network, the route will be lost. For this reason, in the existing router equipment, there is a problem that the service must be stopped when the host moves over the network.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide a basic Internet working function utilizing a mobile IP protocol for ensuring the mobility of the host without changing the IP address in the Internet network. At the same time, the present invention provides an agent routing system and a method for providing a mobile IP function so that a mobile IP function can be provided to a host without changing the IP address even if the host moves to a new network by adding a mobile IP function.

In order to achieve the above object, the agent routing system providing the mobile IP function of the present invention receives an advertisement message, determines whether the agent is present in the home network or the external network, and transmits a registration request message. A mobile terminal which performs authentication and communicates with another mobile terminal;

After sending the advertisement message to a plurality of mobile terminals and receiving a registration request message from the mobile terminal determines the home agent IP address field in the registration request message and performs the home agent router function if the home agent IP address is itself, It receives a registration request message from any mobile terminal, checks the validity of the registration request message, and if it is valid, updates the mobile binding list and sends the valid registration response message to the mobile terminal, while encapsulating the registration request. A home agent router which encapsulates a message when the message is received, validates the original registration request message, updates the mobile binding list if valid, and transmits the valid registration response message using the encapsulated IP; And

When the registration request message is received from the mobile terminal, it is encapsulated and transmitted to the home agent router. When the valid registration response message is received from the home agent router, the agent is configured as an external agent router that transmits the registration response message to the mobile terminal. It is characterized by.

In order to achieve the above object, the agent routing method for providing a mobile IP function according to the present invention comprises the steps of: an external agent router periodically transmitting an advertisement message to a plurality of mobile terminals through a broadcast method;

Step 102, wherein the external agent router receives a registration request message from any mobile terminal;

Step 103, the external agent router determining whether a home agent IP of a registration request message is equal to an IP of a mobile binding list;

In step 103, if the home agent IP and the IP of the mobile binding list are different, the external agent router determines whether the home agent IP of the registration request message exists in the visitor list;

In step 104, if the home agent IP of the registration request message exists in the visitor list, the external agent router encapsulates the registration request message with the home agent indicated in the home agent IP field of the registration request message and transmits the registration request message to the home agent router. Step 105;

A step 106 of determining whether the external agent router receives a valid registration response message for a registration request message from a home agent router;

Step 107, when the valid agent response message is input in step 106, the external agent router adding to the mobile visitor list; And

In step 108, the external agent router transmits a registration response message to the mobile terminal.

1 is a functional block diagram showing a configuration before moving a mobile terminal in an agent routing system providing a mobile IP function according to an embodiment of the present invention;

2 is a functional block diagram illustrating a configuration after moving a mobile terminal in an agent routing system providing a mobile IP function according to FIG. 1;

3 is a flowchart illustrating an agent routing method for providing a mobile IP function according to an embodiment of the present invention;

4 is a flowchart illustrating a detailed configuration of step 109 (S109) of the agent routing method for providing a mobile IP function according to FIG.

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

100: mobile terminal 200: home agent router

300: external agent router

Hereinafter, an agent routing system and a method for providing a mobile IP function according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are functional block diagrams of an agent routing system providing a mobile IP function according to an embodiment of the present invention, the agent routing system providing a mobile IP function according to an embodiment of the present invention is a mobile terminal (100) ), A home agent router 200, and an external agent router 300.

The mobile terminal 100 receives an advertisement message from the home agent router 200 or the external agent router 300 to determine whether the mobile terminal 100 exists in the home network network or the external network network. After transmitting the registration request message to the agent router connected to the authentication and serves to perform communication with other mobile terminal 100.

In addition, the home agent router 200 transmits an advertisement message to the plurality of mobile terminals 100 by using broadcast or multicasting, and receives a registration request message from any mobile terminal 100. Validate the registration request message and if valid, update the mobile binding list and send the valid registration response message to the mobile terminal 100 and input the encapsulated registration request message from the external agent router 300. Encapsulate it upon receipt, validate the original registration request message, update the mobile binding list if it is valid, and use the encapsulated IP (COA (Care-Of-Address)) to update the mobile binding list. It serves to transmit to the agent router (300). At this time, the validity check of the home agent router 200 checks the validity through UDP checksum, authentication check, and registration ID check, and generates a mobile binding list for the corresponding mobile terminal 100 when a valid registration request message is received. Or modify it. At this point, the COA provides information about the current network connection point and is used as an intermediate address for the encapsulation method. For example, in the case of mail sent to the mail, the COA (Mr. Similar to using yours). In addition, the mobile terminal 100 and the home agent router 200 must perform authentication, and use the MD5 algorithm through 128 bits.

When the external agent router 300 receives a registration request message registered in the visitor list without being registered in the binding list from the mobile terminal 100, the external agent router 300 encapsulates it and transmits the registration request message to the home agent router 200. When receiving a valid registration response message from the agent router 200 serves to transmit the registration response message to the mobile terminal (100). At this time, the external agent router 300 checks the validity of the registration request message input from the mobile terminal 100 and when there is security related to the registration request message, one mobile external authentication must exist. . That is, the external agent router checks the validity through the visitor list that checks the mobile external authentication, not the authentication through the mobile binding list, and transmits a registration rejection message to the mobile terminal 100 with an error code if the validity is not valid. If it is a valid value, it is encapsulated and transmitted to the home agent router 200.

Next, an agent routing method for providing a mobile IP function having the above configuration will be described with reference to FIG. 3.

First, the external agent router 300 periodically transmits an advertisement message to the plurality of mobile terminals 100 through a broadcast method (S101).

Subsequently, the external agent router 300 receives a registration request message from any mobile terminal 100 (S102).

The external agent router 300 determines whether the home agent IP of the registration request message received from the mobile terminal 100 is the same as the IP of the mobile binding list (S103).

At this time, if the home agent IP and the IP of the mobile binding list are different (NO) in step 103, the external agent router 300 determines whether the home agent IP of the registration request message exists in the visitor list. It is determined (S104). At this time, the external agent router 300 determines whether it is a home agent or an external agent through the 103rd step S103 and the 104th step S104.

Meanwhile, if the home agent IP of the registration request message exists in the visitor list (YES) in step 104, the external agent router 300 requests to register with the home agent indicated in the home agent IP field of the registration request message. The message is encapsulated and transmitted to the home agent router 200 (S105). In this case, the encapsulation of the agent router is a method of temporarily re-addressing the IP datagram in the middle to transmit a message to a destination, which is often referred to as tunneling.

At this time, the external agent router 300 determines whether a valid registration response message is received from the home agent router 200 with respect to the registration request message (S106).

On the other hand, if the valid registration response message is input in step 106 (YES), the external agent router 300 adds to the mobile visitor list (S107).

Subsequently, the external agent router 300 transmits a registration response message to the mobile terminal 100 (S108).

On the other hand, if the home agent IP and the IP of the mobile binding list are the same in step 103 (YES), the external agent router 300 operates as a home agent and receives a registration request received from the mobile terminal 100. After determining the validity of the message, if the registration request message is valid, the mobile binding list is updated to transmit a registration response message to the mobile terminal 100 (step S109).

Hereinafter, a detailed operation process of the above-described step 109 (S109) will be described in more detail with reference to FIG. 4.

First, the external agent router 300 determines whether the mobile terminal 100 ID exists in the registration request message input from the mobile terminal 100 through the mobile binding list (S109-1). At this time, the authentication performed by the agent router through the mobile binding list includes information on the current network connection point (COA), life time registration, and identification field of the mobile terminal 100. Compare through.

At this time, if the ID of the registration request message exists in step 109-1 (S109-1) (YES), the external agent router 300 determines whether the life time of the registration request message is '0'. (S109-2).

At this time, if the life time of the registration request message is not '0' in step 109-2 (S109-2), the external agent router 300 determines whether a tunnel exists or not (S109-). 3).

At this time, if there is a tunnel (YES) in step 109-3 (S109-3), the external agent router 300 resets the tunnel at the same time as resetting the life time (S109-4).

Subsequently, the external agent router 300 transmits a registration response message to the mobile terminal 100 (S109-5).

On the other hand, if there is no tunnel in step 109-3 (S109-3) (NO), the external agent router 300 creates a tunnel (S109-6).

Subsequently, the external agent router 300 transmits a registration response message to the mobile terminal 100 (S109-7).

On the other hand, if the authentication of the registration request message is not confirmed in step 109-1 (S109-1) (NO), the external agent router 300 transmits an error code and a registration rejection message to the mobile terminal 100. (S109-8).

On the other hand, if the life time of the registration request message is not '0' (NO) in step 109-2 (S109-2), the external agent router 300 performs tunnel down, ARP deletion, and router to cancel registration. Delete (S109-9).

Subsequently, the external agent router 300 transmits a registration response message indicating that the registration has been canceled to the mobile terminal 100 (S109-10).

On the other hand, if the home agent IP of the registration request message does not exist in the visitor list in step 104 (NO), the external agent router 300 sends an error code and a registration rejection message to the mobile terminal 100. Transmit to (S110).

On the other hand, if an invalid registration response message is input in step 106 (NO) (NO), the external agent router 300 transmits an error code and a registration rejection message to the mobile terminal 100 (S111). .

According to the agent routing system and method for providing a mobile IP function according to the present invention as described above, provides a basic Internet working function utilizing a mobile IP protocol for ensuring the mobility of the host without changing the IP address in the Internet network At the same time, by adding the Mobile IP function, it is possible to provide the Mobile IP function so that the host can provide continuous service to the host without changing the IP address even if the host moves to a new network. The great effect is that you can use the Internet without it.

Claims (9)

A mobile terminal configured to receive an advertisement message and determine whether the terminal is present in a home network or an external network, and transmit a registration request message to be authenticated to perform communication with another mobile terminal; After sending the advertisement message to a plurality of mobile terminals and receiving a registration request message from the mobile terminal determines the home agent IP address field in the registration request message and performs the home agent router function if the home agent IP address is itself, It receives a registration request message from any mobile terminal, checks the validity of the registration request message, and if it is valid, updates the mobile binding list and sends the valid registration response message to the mobile terminal, while encapsulating the registration request. A home agent router which encapsulates a message when the message is received, validates the original registration request message, updates the mobile binding list if valid, and transmits the valid registration response message using the encapsulated IP; And When the registration request message is received from the mobile terminal, it is encapsulated and transmitted to the home agent router, and when the valid registration response message is received from the home agent router, the external agent router configured to transmit the registration response message to the mobile terminal. Agent routing system providing a mobile IP function, characterized in that. Step 101, the external agent router periodically transmitting the advertisement message to the plurality of mobile terminals through a broadcast method; Step 102, wherein the external agent router receives a registration request message from any mobile terminal; Step 103, the external agent router determining whether a home agent IP of a registration request message is equal to an IP of a mobile binding list; In step 103, if the home agent IP and the IP of the mobile binding list are different, the external agent router determines whether the home agent IP of the registration request message exists in the visitor list; In step 104, if the home agent IP of the registration request message exists in the visitor list, the external agent router encapsulates the registration request message with the home agent indicated in the home agent IP field of the registration request message and transmits the registration request message to the home agent router. Step 105; A step 106 of determining whether the external agent router receives a valid registration response message for a registration request message from a home agent router; Step 107, when the valid agent response message is input in step 106, the external agent router adding to the mobile visitor list; And And a step 108 of the external agent router transmitting a registration response message to the mobile terminal. The method of claim 2, In step 103, if the home agent IP and the IP of the mobile binding list are the same, the external agent router operates as a home agent to determine the validity of the registration request message received from the mobile terminal, and if the registration request message is valid, And updating a binding list to transmit a registration response message to the mobile terminal. The method of claim 2, In step 104, if the home agent IP of the registration request message does not exist in the visitor list, the external agent router may further include step 110 of transmitting an error code and a registration rejection message to the mobile terminal. Agent routing method that provides mobile IP functionality. The method of claim 2, If the invalid registration response message is received in step 106, the external agent router further comprises a step 111 of transmitting an error code and a registration rejection message to the mobile terminal. Agent routing method. The method of claim 3, wherein The step 109 may include: step 109-1 of the external agent router determining whether a mobile terminal ID exists in a registration request message input from the mobile terminal through a mobile binding list; Step 109-2, if the ID of the registration request message is present in step 109-1, determining whether the lifetime of the registration request message is '0'; Step 109-3, in step 109-2, if the lifetime of the registration request message is not '0', the external agent router determines whether a tunnel exists; Step 109-4 of resetting the tunnel at the same time as the external agent router resets the life time when the tunnel exists in step 109-3; And And a step 109-5 of the external agent router transmitting a registration response message to the mobile terminal. The method of claim 6, Step 109-6, if the tunnel does not exist in step 109-3, the external agent router creates a tunnel; And And a step 109-7 of the external agent router transmitting a registration response message to the mobile terminal. The method of claim 6, If the authentication of the registration request message is not confirmed in step 109-1, the mobile agent further comprises step 109-8 of transmitting an error code and a registration rejection message to the mobile terminal. Agent routing method that provides IP functionality. The method of claim 6, In step 109-9, if the lifetime of the registration request message is not '0', tunnel down, ARP deletion, and deletion of the router to cancel registration by the external agent router; And And a step 109-10 of transmitting a registration response message indicating that the external agent router has been registered to the mobile terminal.