JP2003298634A - Data communication method of mobile terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a data transfer method wherein transfer interruption does not occurred when a mobile terminal which does not support a mobile IP moves from a home network to a foreign network or moves between foreign networks. <P>SOLUTION: This data communication method includes a process wherein the mobile terminal MN transmits an access demand to the foreign network (FN), a process wherein the (FN) identifies a home network (HN) of the mobile terminal MN, a process wherein the FN transmits an authorization demand to the HN of the mobile terminal MN, a process wherein the HN transmits an authorization response to the FN, a process wherein the FN demands the position registration of the mobile terminal MN to the HN, a process wherein the HN informs an IP address to FN, a means wherein the mobile terminal MN transmits an address demand to the FN, and a process wherein the FN assigns the IP address to the mobile terminal MN. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication method, and more particularly to a data communication method in which a mobile terminal moving from a home network to a foreign network performs data communication with a partner terminal via the foreign network.

[0002]

2. Description of the Related Art On the Internet, mobile terminals (Mo
The network address portion of the IP address assigned to the bile nodet (MN) is the network to which the mobile terminal MN normally belongs (hereinafter, home network: Home N).
etwork) The address is unique to HN. Therefore, when the mobile terminal MN moves to another network (hereinafter, Foreign Network) FN, it is necessary to newly acquire an IP address including an address unique to the foreign network FN.

On the other hand, even when the mobile terminal MN moves to another network, it is as if it were the home network.
RFC (Request For Commece) is a method to continue the connection without changing the IP address as if it was connected to the HN.
Mobile IP specified in 2002 has been proposed.

In order to realize Mobile IP, as shown in FIGS. 8 to 11, a node called a home agent HA (Home Agent) is arranged in the home network HN, and a foreign network FN is provided with a foreign node. Agent A node called FA (Foreign Agent) is placed.

Since the mobile terminal MN has already acquired the IP address available in the home network HN, it can directly receive the IP packet while connected to the home network HN. When the mobile terminal MN moves to a foreign network FN or moves between foreign networks FN, an agent advertisement (Agent Advertis
ement) message, it recognizes the foreign network FN to which it belongs. Then, as shown in FIG. 8, the foreign agent FA of the movement destination
The IP address of is sent in the RRQ (Registration Request) message to notify the home agent HA of the home network HN. In response to this message, home agent HA transfers an RRR (Registration Reply) message to mobile terminal MN via foreign agent FA and base station AP (access point) to complete the location registration.

After that, as shown in FIG. 9, the home agent HA takes over all the IP packets sent from the partner terminal CN to the mobile terminal MN. Home agent HA
Encapsulates an IP packet whose destination is the IP address of the mobile terminal MN with an IP packet whose care-of address is the IP address of the foreign agent FA (IP tunneling), and transfers it to the foreign agent FA via the Internet. The foreign agent FA returns the encapsulated IP packet to the original IP packet addressed to the mobile terminal MN, and passes the access point AP to the mobile terminal MN.
Transfer to.

The data from the mobile terminal MN to the partner terminal CN is, as shown in FIG. 10, a foreign network FN.
By transferring the data to the gateway router R which has obtained the address by the agent advertisement message transmitted from the device, the data is transferred to the partner terminal CN according to the normal IP routing.

When the mobile terminal MN moves from the foreign network FN1 to another foreign network FN2, as shown in FIG. 11, after establishing a connection with the destination base station AP2, the home terminal HA is notified to the home agent HA. Then, the same location registration request is made again, and the data addressed to the mobile terminal MN is transferred.

[0009]

In the above-mentioned conventional technique, the mobile terminal MN supports the mobile IP, and it is required that the mobile terminal MN receives an agent advertisement and outputs a location registration request (Registration Request). Was done. Therefore, a mobile terminal that does not support mobile IP cannot realize the above-mentioned functions.

It is an object of the present invention to provide a mobile terminal management method which solves the above-mentioned problems of the prior art and enables even a mobile terminal which does not support mobile IP to receive the same service as mobile IP. is there.

[0011]

In order to achieve the above object, the present invention provides a data communication method in which a mobile terminal moving from a home network to a foreign network performs data communication with a partner terminal via the foreign network. In the above, the feature is that the following measures are taken.

(1) A procedure in which the mobile terminal transmits an access request and its own identification information to the foreign network of the movement destination, and the foreign network that has received the access request and the identification information uses the mobile terminal based on the identification information. Of identifying the home network of the mobile terminal, the foreign network transmitting an authentication request based on the identification information to the home network of the mobile terminal, and the home network receiving the authentication request performs authentication of the identification information. If the identification information is authentic identification information, a procedure for transmitting an authentication response to the foreign network, and the foreign network receiving the authentication response requests the home network to register the location of the mobile terminal. The procedure and the home network that received the location registration request. Network determines an IP address to be assigned to the mobile terminal and notifies the foreign network of the mobile terminal, means for the mobile terminal to send an address request to the foreign network, and the foreign network receiving the address request to the home network. And assigning the IP address notified from the network to the mobile terminal.

(2) A procedure in which the mobile terminal transmits an access request and its own identification information to the foreign network of the movement destination, and the foreign network which has received the access request and the identification information uses the mobile terminal based on the identification information. Of identifying the home network of the mobile terminal, the foreign network transmitting an authentication request based on the identification information to the home network of the mobile terminal, and the home network receiving the authentication request performs authentication of the identification information. If the identification information is legitimate identification information, a procedure of determining an IP address to be assigned to the mobile terminal and notifying the foreign network, means for the mobile terminal to send an address request to the foreign network, and the address The foreign network that received the request Characterized in that it comprises a procedure for assigning the IP address notified from the serial home network to the mobile terminal.

According to the above feature (1), the foreign network that has received the access request from the mobile terminal can acquire the IP address from the home network of the mobile terminal and notify the mobile terminal of the mobile network.
Even mobile devices that do not support IP
It will be possible to communicate in the same procedure as mobile IP on networks that support IP.

According to the above feature (2), it becomes possible to realize the mobile IP compliant communication by the mobile terminal which does not support the mobile IP by a simpler procedure.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing a configuration of a network to which the present invention is applied together with a location registration procedure of a mobile terminal MN in the first embodiment.

A home agent HA and an authentication server are arranged in the home network HN to which the mobile terminal MN normally belongs. In this embodiment, the address of the home network HN is [isp1.net]. Foreign agent FA to foreign network FN1
1, a wireless base station AP1, a proxy authentication server, and a host setting server are arranged. In this embodiment, as the host setting server, a DHCP (Dynamic Host Configuration Pr
otocol) server can be used.

Next, the operation of the first embodiment of the present invention will be described in detail with further reference to the communication protocol shown in FIG.

The mobile terminal MN out of the coverage of the home network HN sends an access request in step S1, which is a foreign agent FA1 at the movement destination.
When received by the wireless base station AP1 accommodated in
In step S2, the wireless base station AP1 that has received the access request requests the mobile terminal MN to register a user name.

When the user name is input to the mobile terminal MN in step S3, this is transmitted to the radio base station AP1. In the present embodiment, it is assumed that the user name of the mobile terminal MN is input in the NAI (Network Address Identifier) format, and here the user name of the mobile terminal MN is [use
r@isp1.net] and continue the explanation.

At step S4, the authentication request in which the user name is registered is transmitted from the wireless base station AP1 to the proxy authentication server in the same network. In step S5,
The proxy authentication server uses the domain name part "use" of the user name.
home network HN of the mobile terminal MN based on "r"
And sends the authentication request registered with this user name to the authentication server of the home network HN. The authentication server that has received the authentication request authenticates whether or not this user name is already registered as an authorized user for the home network HN. If it is an authorized user, step S6
From the authentication server to the foreign network
To the FN1 proxy authentication server, enter the user name [user@isp1.ne
The registered authentication response of [t] is transmitted.

In step S7, the proxy authentication server transmits the authentication response in which the user name is registered to the base station AP1. In step S8, the base station AP1 to the mobile terminal MN
An access response is sent to. The base station AP1 receives the agent advertisement that the foreign agent FA1 regularly sends, and in step S9, the address of the foreign agent FA1 is taken into consideration as the care-of address (CO
The location registration request as A) is transmitted to the host setting server on behalf of the mobile terminal MN.

In step S10, the user name and
The location registration request in which the COA (FA1) is registered is transmitted from the host setting server to the foreign agent FA1, and the combination of the user name and COA (FA1) is registered in the foreign agent FA1. In step S11,
The location registration request in which the user name and COA (FA1) are registered is sent from the foreign agent FA1 to the home agent HA1, and the user name “user@isp1.net” and C
The combination with OA (FA1) is registered in home agent HA1.

In step S12, the home agent
The authentication confirmation request in which the user name and COA are registered is transmitted from HA1 to the authentication server. The authentication server authenticates whether the user name registered in the received authentication confirmation request is already registered as a legitimate user for the home network HN. If the user is an authorized user, the IP address addr.1 associated with the user name is selected and registered in the visitor list, and in step S13, the authentication confirmation response in which the IP address and the user name are registered is registered. Is sent to home agent HA1. The home agent HA stores the notified IP address addr.1 in association with the user name “user@isp1.net” and COA (FA1).

In step S14, the user name and
The registered location registration response of IP address addr.1 is sent from home agent HA1 to foreign agent FA1. At this time, the information that the home agent (HA) of the mobile terminal MN is the HA1 is registered in the foreign agent FA1.

In step S15, the user name and
The location registration response in which the IP address is registered is transmitted from the foreign agent FA1 to the host setting server. In step S16, the location registration response in which the user name and IP address are registered is sent from the host setting server to the base station.
Sent to AP1.

Asynchronously with the above processing, step S17
Then, the mobile terminal MN sends an address request in which its own user name is registered to the host setting server. at this point,
If the foreign address FA1 has already notified the host setting server of the IP address of the mobile terminal MN (step S15), the host setting server sends the IP address [Addr.
1] is sent and the IP address of home agent HA1 as the gateway address is sent.

In this way, the location registration of the mobile terminal MN,
After the IP address allocation and the care-of address setting are completed, communication is performed in the procedure based on the conventional mobile IP thereafter.

FIG. 3 is a diagram showing a communication procedure based on the mobile IP. In step S1, when the partner terminal CN specifies the IP address of the mobile terminal MN and transmits packet data, this is transmitted by the home agent HA1. Be received. Since the relationship between the IP address of the mobile terminal MN and the care-of address COA (address of the foreign agent FA1 in this embodiment) is stored in the home agent HA1, the home agent HA1 transmits the received packet to the mobile IP communication. After encapsulation according to the procedure, in step S2, the foreign agent FA
Send 1 as a care-of address COA. After opening the capsule of the received packet, the foreign agent FA1 sends it to the mobile terminal MN in step S3.

In step S5, the mobile terminal MN is the partner terminal.
A packet addressed to the CN is transmitted to the gateway (HA1) of the home network HN that has been notified beforehand. In step S6, when the foreign agent FA1 receives the packet destined for the home network HN, it encapsulates it according to the communication procedure of the mobile IP and transmits the home agent HA1 as the care-of address COA. In step S7, the home agent HA
1 transmits the received packet to the partner terminal CN.

FIG. 4 is a diagram showing a handoff procedure when the mobile terminal MN, which has completed the location registration in the foreign network FN1 as described above and has acquired the IP address, moves to another foreign network FN2. is there. In addition,
Since the processing of steps S1 to S11 is the same as the procedure in the foreign network FN1, the description thereof is omitted here.

When the home agent HA1 of the home network HN receives the location registration request in which the user name of the mobile terminal MN is registered from the foreign agent FA2 of the moving destination in step S11, the home agent HA1 receives the visitor in step S12. Search the list,
A location registration response in which the user name and IP address of the mobile terminal MN are registered is transmitted using the foreign agent FA2 as a care-of address. In step S13, the foreign agent FA2 transmits a location registration response in which the user name and IP address of the mobile terminal MN are registered, to the host setting server. In step S14, a location registration response in which the IP address of the mobile terminal MN is registered is transmitted from the host setting server to the base station AP.

According to the present embodiment, the foreign network FN (host setting server) which has received the access request from the mobile terminal MN is transmitted from the home network HN of the mobile terminal MN.
Since the IP address is acquired and notified to the mobile terminal MN, even if the mobile terminal does not support the mobile IP, the mobile IP will be transmitted on the network supporting the mobile IP.
Communication can be performed by the same procedure compliant with.

Next, the operation of the second embodiment of the present invention will be described. FIG. 5 is a diagram showing a procedure for assigning an IP address to the mobile terminal MN according to the second embodiment of the present invention.
FIG. 3 is a diagram showing the communication protocol.

When the mobile terminal MN out of the coverage of the home network HN sends an access request in step S1, this is the foreign agent of the movement destination.
It is received by the radio base station AP1 accommodated in FA1. In step S2, the wireless base station AP1 that has received the access request requests the mobile terminal MN to register a user name. In step S3, when the mobile terminal MN inputs its own user name in the same manner as above, this is transmitted to the radio base station AP1.

In step S4, the authentication request for the user name is transmitted from the wireless base station AP1 to the proxy authentication server in the same network. In step S5, the proxy authentication server recognizes the home network HN of the mobile terminal MN based on the domain name portion "user" of the user name, and sends an authentication request for this user name to the authentication server of the home network HA.

The authentication server, which has received the authentication request, authenticates whether or not this user name has already been registered as an authorized user of the home network HN. If it is an authorized user, the IP address Addr.1 associated with the user name is selected, and in step S6, the location registration request in which the IP address and the user name are registered is transmitted to the home agent HA1. In step S7, the home agent HA1 that has received the location registration request transmits a location registration response to the authentication server.

In step S8, the IP address is transferred from the authentication server to the proxy authentication server of the foreign network FN2.
A location registration response with the registered address and user name is sent. In step S9, the location registration request in which the IP address and the user name are registered is transmitted from the proxy authentication server to the foreign agent FA1. In step S10, a response to the location registration request is transmitted from the foreign agent FA1 to the proxy authentication server.

In step S11, the foreign agent FA1 transmits to the base station AP1 the authentication response in which the IP address and the user name are registered. Step S12
In, when the address registration request is transmitted from the base station AP1 to the host setting server, an address registration response to this is transmitted from the host setting server to the base station AP1 in step S13. In step S14, an access response is transmitted from the base station AP1 to the mobile terminal MN.

Asynchronously with the above processing, step S15
Then, the address request for the user name is transmitted from the mobile terminal MN to the host setting server. At this point, the foreign agent FA1 has already notified the host setting server of the IP address of the mobile terminal MN (step S1).
If so, an address response is transmitted from the host setting server to the mobile terminal MN in step S16, thereby notifying the IP address.

When the location registration of the mobile terminal MN and the assignment of the IP address are completed in this way, communication is thereafter performed in the procedure compliant with the conventional mobile IP.

FIG. 7 is a diagram showing a handoff procedure when the mobile terminal MN, which has completed the location registration to the foreign network FN1 as described above and has acquired the IP address, moves to another foreign network FN2. is there. Here, a procedure similar to that of FIG. 6 is performed except that the procedures of steps S15 and S16 are not performed, and therefore the description thereof is omitted.

According to this embodiment, the mobile IP compliant communication by the mobile terminal which does not support the mobile IP is
This can be realized by a simpler procedure.

[0044]

According to the present invention, since the host setting server of the foreign network FN obtains the IP address assigned to the mobile terminal MN from the home network HN1 of the mobile terminal MN and notifies the mobile terminal MN, the mobile IP support is provided. Even mobile terminals that do not do so will be able to perform communication in the same procedure as mobile IP on networks that support mobile IP.

[Brief description of drawings]

FIG. 1 is a block diagram showing a location registration procedure according to a first embodiment of the present invention.

FIG. 2 is a sequence diagram showing a location registration procedure in the first embodiment of the present invention.

FIG. 3 is a block diagram showing a data transfer procedure in the first embodiment of the present invention.

FIG. 4 is a block diagram showing a handoff procedure in the first embodiment of the present invention.

FIG. 5 is a block diagram showing a location registration procedure according to the second embodiment of the present invention.

FIG. 6 is a sequence diagram showing a location registration procedure according to the second embodiment of the present invention.

FIG. 7 is a block diagram showing a handoff procedure in the second embodiment of the present invention.

FIG. 8 is a block diagram (No. 1) for explaining a location registration procedure in conventional mobile IP.

FIG. 9 is a block diagram (No. 2) for explaining the location registration procedure in the conventional mobile IP.

FIG. 10 is a block diagram (No. 3) for explaining the location registration procedure in the conventional mobile IP.

FIG. 11 is a block diagram (No. 4) for explaining the location registration procedure in the conventional mobile IP.

[Explanation of symbols]

AP1, AP2 ... Base station, FN1, FN2 ... Foreign network, FA1, FA2 ... Foreign agent, HA1 ... Home agent, HN ... Home network, MN ... Mobile terminal, R1, R2 ... Gateway router

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Akira Idogami             2-15-1 Ohara, Kamifukuoka City, Saitama Stock             Company CAD Research Institute (72) Inventor Toru Hasegawa             2-15-1 Ohara, Kamifukuoka City, Saitama Stock             Company CAD Research Institute (72) Inventor Toru Asami             2-15-1 Ohara, Kamifukuoka City, Saitama Stock             Company CAD Research Institute F-term (reference) 5K030 GA15 HC01 HC09 HD05 HD09                       KA01 KA02

Claims (4)

[Claims] 1. A data communication method in which a mobile terminal, which has moved from a home network to a foreign network, performs data communication with a partner terminal via the foreign network, wherein the mobile terminal sends an access request and its own identification information to the foreign destination. A procedure for transmitting to the network, a foreign network receiving the access request and the identification information, a procedure for identifying the home network of the mobile terminal based on the identification information, the foreign network to the home network of the mobile terminal A procedure for transmitting an authentication request based on the identification information, and a home network that has received the authentication request authenticates the identification information, and if the identification information is authentic identification information, an authentication response is transmitted to the foreign network. Steps to The foreign network that receives the authentication response requests the home network to register the location of the mobile terminal, and the home network that receives the location registration request determines the IP address to be assigned to the mobile terminal. A step of notifying the foreign network, the mobile terminal means for transmitting an address request to the foreign network, a foreign network receiving the address request, a step of allocating the IP address notified from the home network to the mobile terminal, A data communication method for a mobile terminal, comprising: 2. A data communication method in which a mobile terminal moving from a home network to a foreign network performs data communication with a partner terminal via the foreign network, wherein the mobile terminal transmits an access request and its own identification information to the foreign destination. A procedure for transmitting to the network, a foreign network receiving the access request and the identification information, a procedure for identifying the home network of the mobile terminal based on the identification information, the foreign network to the home network of the mobile terminal A procedure for transmitting an authentication request based on the identification information, a home network that receives the authentication request authenticates the identification information, and if the identification information is authentic identification information, an IP address to be assigned to the mobile terminal is assigned. Decided and foreign Network, the mobile terminal, means for transmitting an address request to the foreign network, the foreign network receiving the address request, a procedure for assigning the IP address notified from the home network to the mobile terminal, A data communication method for a mobile terminal, comprising: 3. A procedure in which a home network of the mobile terminal receives data transmitted from a partner terminal to the mobile terminal, and a step in which the home network identifies a foreign network which is a current accommodation destination of the mobile terminal. And the home network transfers the received data using the foreign network as a care-of address, and the foreign network transfers the received data to a mobile terminal.
Alternatively, the data communication method of the mobile terminal according to item 2. 4. A procedure in which the foreign network receives data transmitted from the mobile terminal to a partner terminal on the foreign network, a procedure in which the foreign network identifies a home network of the mobile terminal, and a foreign network The mobile terminal according to claim 1 or 2, further comprising: a step of transferring the received data by using the home network as a care-of address, and a step of transferring the received data by the home network to a partner terminal. Data communication method.