JP3885942B2 - Data communication method of mobile terminal - Google Patents

Description

[0001]
BACKGROUND 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 that has moved from a home network to a foreign network performs data communication with a partner terminal via the foreign network.
[0002]
[Prior art]
In the Internet, the network address portion of the IP address assigned to a mobile terminal (Mobile Nodet: MN) is a unique address of the network (hereinafter referred to as home network) HN to which the mobile terminal MN usually belongs. . Therefore, when the mobile terminal MN moves to another network (hereinafter referred to as a foreign network) FN, it is necessary to newly acquire an IP address including an address unique to the foreign network FN.
[0003]
On the other hand, even if the mobile terminal MN moves to another network, RFC (Request For Comments) is a method for continuing the connection without changing the IP address as if it were connected to the home network HN. Mobile IP defined in 2002 has been proposed.
[0004]
In order to realize the 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 the foreign agent FA ( Place a node called Foreign Agent.
[0005]
Since the mobile terminal MN has already acquired an IP address that can be used in the home network HN, the mobile terminal MN can directly receive the IP packet while connected to the home network HN. When the mobile terminal MN moves to the foreign network FN or moves between the foreign networks FN, by receiving an agent advertisement (Agent Advertisement) message that the foreign agent FA of the moving destination periodically announces, Recognizes the foreign network FN to which it belongs. Then, as shown in FIG. 8, the IP address of the destination foreign agent FA is put on an RRQ (Registration Request) message and notified to the home agent HA of the home network HN. In response to this message, the home agent HA transfers an RRR (Registration Reply) message to the mobile terminal MN via the foreign agent FA and the base station AP (access point) to complete the location registration.
[0006]
Thereafter, the home agent HA takes over all the IP packets sent from the counterpart terminal CN to the mobile terminal MN as shown in FIG. The home agent HA encapsulates the IP packet whose destination is the IP address of the mobile terminal MN with the IP packet whose care-of address is the IP address of the foreign agent FA (IP tunneling), and forwards it to the foreign agent FA via the Internet To do. The foreign agent FA returns the encapsulated IP packet to the original IP packet addressed to the mobile terminal MN and transfers it to the mobile terminal MN via the access point AP.
[0007]
As shown in FIG. 10, the data from the mobile terminal MN to the counterpart terminal CN is transferred to the gateway router R that has acquired the address by the agent advertisement message transmitted from the foreign network FN, thereby performing normal IP routing. Is transferred to the counterpart terminal CN.
[0008]
As shown in FIG. 11, when the mobile terminal MN moves from the foreign network FN1 to another foreign network FN2, after establishing a connection with the destination base station AP2, the same applies to the home agent HA. The location registration request is made again, and the data addressed to the mobile terminal MN is transferred.
[0009]
[Problems to be solved by the invention]
In the above-described prior art, the mobile terminal MN supports mobile IP, and is required to receive an agent advertisement and output a location registration request. Therefore, a mobile terminal that does not support mobile IP cannot realize the above functions.
[0010]
An object of the present invention is to solve the above-described problems of the prior art and provide a mobile terminal management method that allows a mobile terminal that does not support mobile IP to receive a service equivalent to that of the Poby IP.
[0011]
[Means for solving the problems]
In order to achieve the above-described object, the present invention provides the following means in a data communication method in which a mobile terminal that has moved from a home network to a foreign network performs data communication with a counterpart terminal via the foreign network. There is a feature in the point.
[0012]
(1) A procedure in which a mobile terminal transmits an access request and its own identification information to a destination foreign network, and the foreign network that has received the access request and the identification information is based on the identification information and the home network of the mobile terminal A procedure in which the foreign network transmits an authentication request based on the identification information to the home network of the mobile terminal, and the home network that has received the authentication request authenticates the identification information, and When the information is legitimate identification information, a procedure for transmitting an authentication response to the foreign network, a foreign network that has received the authentication response requests the home network to register the location of the mobile terminal, The home network that has received the location registration request A procedure for 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 a foreign network receiving the address request from the home network And a procedure for assigning the assigned IP address to the mobile terminal.
[0013]
(2) A procedure in which a mobile terminal transmits an access request and its own identification information to a foreign network of a destination, and a foreign network that has received the access request and the identification information is based on the identification information, and the home network of the mobile terminal A procedure in which the foreign network transmits an authentication request based on the identification information to the home network of the mobile terminal, and the home network that has received the authentication request authenticates the identification information, and If the information is legitimate identification information, a procedure for determining an IP address to be assigned to the mobile terminal and notifying the foreign network, a means for the mobile terminal to send an address request to the foreign network, and receiving the address request The foreign network Characterized in that it comprises a procedure for assigning the IP address notified from the network to the mobile terminal.
[0014]
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 terminals that are not able to communicate with each other will be able to communicate on a network that supports mobile IP in the same procedure as mobile IP.
[0015]
According to the above feature (2), mobile IP-compliant communication by a mobile terminal that does not support mobile IP can be realized with a simpler procedure.
[0016]
DETAILED DESCRIPTION OF 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 the configuration of a network to which the present invention is applied, together with the location registration procedure of a mobile terminal MN in the first embodiment.
[0017]
A home agent HA and an authentication server are arranged in the home network HN to which the mobile terminal MN usually belongs. In the present embodiment, the address of the home network HN is [isp1.net]. In the destination foreign network FN1, a foreign agent FA1, a radio base station AP1, a proxy authentication server, and a host setting server are arranged. In the present embodiment, a DHCP (Dynamic Host Configuration Protocol) server can be used as the host setting server.
[0018]
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.
[0019]
When the mobile terminal MN deviating from the coverage of the home network HN transmits an access request in step S1, and this is received by the radio base station AP1 accommodated in the destination foreign agent FA1, in step S2, the access is made. The wireless base station AP1 that has received the request requests the mobile terminal MN to register a user name.
[0020]
In step S3, when a user name is input to the mobile terminal MN, this is transmitted to the radio base station AP1. In this 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 assumed to be [user@isp1.net]. Continue.
[0021]
In step S4, the authentication request in which the user name is registered is transmitted from the radio base station AP1 to the proxy authentication server in the same network. In step S5, the proxy authentication server identifies the home network HN of the mobile terminal MN based on the domain name portion “user” of the user name, and sends the authentication request in which the user name is registered to the authentication server of the home network HN. Send. The authentication server that has received the authentication request authenticates whether or not this user name is already registered as a regular user related to the home network HN. If the user is an authorized user, in step S6, an authentication response in which the user name [user@isp1.net] is registered is transmitted from the authentication server to the proxy authentication server of the foreign network FN1.
[0022]
In step S7, an authentication response in which the user name is registered is transmitted from the proxy authentication server to the base station AP1. In step S8, an access response is transmitted from the base station AP1 to the mobile terminal MN. The base station AP1 receives the agent advertisement periodically transmitted by the foreign agent FA1. In step S9, the base station AP1 issues a location registration request with the address of the foreign agent FA1 as a care-of address (COA). On behalf of the host configuration server.
[0023]
In step S10, the location registration request in which the user name and COA (FA1) are 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. The In step S11, the location registration request in which the user name and COA (FA1) are registered is transmitted from the foreign agent FA1 to the home agent HA1, and the combination of the user name “user@isp1.net” and COA (FA1) is obtained. Registered with home agent HA1.
[0024]
In step S12, the authentication confirmation request in which the user name and the COA are registered is transmitted from the home agent HA1 to the authentication server. The authentication server authenticates whether or not the user name registered in the received authentication confirmation request is already registered as a regular user related to 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. At step S13, the authentication confirmation response in which the IP address and the user name are registered is selected. 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 the COA (FA1).
[0025]
In step S14, the registered location registration response of the user name and IP address addr.1 is transmitted from the home agent HA1 to the foreign agent FA1. At this time, information indicating that the home agent (HA) of the mobile terminal MN is the HA1 is registered in the foreign agent FA1.
[0026]
In step S15, the location registration response in which the user name and the IP address are 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 the IP address are registered is transmitted from the host setting server to the base station AP1.
[0027]
Asynchronously with the above processing, in step S17, an address request in which the user name is registered is transmitted from the mobile terminal MN to the host setting server. At this point, if the IP address of the mobile terminal MN has already been notified from the foreign agent FA1 to the host setting server (step S15), in step S18, the IP address [ Address response including Addr.1] and the IP address of home agent HA1 as a gateway address are transmitted.
[0028]
In this way, when the location registration of the mobile terminal MN, the assignment of the IP address, the setting of the care-of address, and the like are completed, communication is performed in accordance with the procedure based on the conventional mobile IP.
[0029]
FIG. 3 is a diagram showing a communication procedure based on mobile IP. In step S1, when the counterpart terminal CN transmits packet data specifying the IP address of the mobile terminal MN, this is received by the home agent HA1. . Since the relationship between the IP address of the mobile terminal MN and the care-of address COA (in this embodiment, the address of the foreign agent FA1) is stored in the home agent HA1, the home agent HA1 communicates the received packet with mobile IP communication. When encapsulated according to the procedure, the foreign agent FA1 is transmitted as a care-of address COA in step S2. When the foreign agent FA1 opens the capsule of the received packet, it transmits it to the mobile terminal MN in step S3.
[0030]
In step S5, the mobile terminal MN transmits a packet addressed to the counterpart terminal CN toward the gateway (HA1) of the home network HN notified in advance. 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 HA1 transmits the received packet to the counterpart terminal CN.
[0031]
FIG. 4 is a diagram showing a handoff procedure when the mobile terminal MN that has completed the location registration in the foreign network FN1 as described above and has acquired an IP address moves to another foreign network FN2. Note that the processing in steps S1 to S11 is the same as the procedure in the foreign network FN1, and thus description thereof is omitted here.
[0032]
When the home agent HA1 of the home network HN receives a location registration request in which the user name of the mobile terminal MN is registered from the destination foreign agent FA2 in step S11, the home agent HA1 searches the visitor list in step S12. Then, the location registration response in which the user name and IP address of the mobile terminal MN are registered is transmitted using the foreagent FA2 as a care-of address. In step S13, a location registration response in which the user name and IP address of the mobile terminal MN are registered is transmitted from the foreign agent FA2 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.
[0033]
According to the present embodiment, the foreign network FN (host setting server) that has received the access request from the mobile terminal MN acquires the IP address from the home network HN of the mobile terminal MN and notifies the mobile terminal MN of the mobile IP. Even a mobile terminal that does not support communication can be performed in a procedure that conforms to mobile IP on a network that supports mobile IP.
[0034]
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 in the second embodiment of the present invention, and FIG. 6 is a diagram showing its communication protocol.
[0035]
When the mobile terminal MN deviating from the coverage of the home network HN transmits an access request in step S1, this is received by the radio base station AP1 accommodated in the foreign agent FA1 that is the movement destination. In step S2, the radio 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 as described above, this is transmitted to the radio base station AP1.
[0036]
In step S4, an authentication request related to the user name is transmitted from the radio 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 transmits an authentication request related to the user name to the authentication server of the home network HA.
[0037]
The authentication server that 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 the user 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.
[0038]
In step S8, the location registration response in which the IP address and the user name are registered is transmitted from the authentication server to the proxy authentication server of the foreign network FN2. 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.
[0039]
In step S11, the authentication response in which the IP address and the user name are registered is transmitted from the foreign agent FA1 to the base station AP1. In step S12, when an address registration request is transmitted from the base station AP1 to the host setting server, in step S13, an address registration response is transmitted from the host setting server to the base station AP1. In step S14, an access response is transmitted from the base station AP1 to the mobile terminal MN.
[0040]
Asynchronously with the above processing, in step S15, an address request relating to the user name is transmitted from the mobile terminal MN to the host setting server. At this time, if the IP address of the mobile terminal MN has already been notified from the foreign agent FA1 to the host setting server (step S12), an address response is transmitted from the host setting server to the mobile terminal MN in step S16. This notifies the IP address.
[0041]
When the location registration of the mobile terminal MN and the assignment of the IP address are completed in this way, communication is performed in accordance with the procedure based on the conventional mobile IP.
[0042]
FIG. 7 is a diagram showing a handoff procedure when the mobile terminal MN that 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. Here, the procedure similar to that of FIG. 6 is executed except that the steps S15 and S16 are not executed, and the description thereof will be omitted.
[0043]
According to the present embodiment, mobile IP-compliant communication by a mobile terminal that does not support mobile IP can be realized with a simpler procedure.
[0044]
【The invention's effect】
According to the present invention, since the host setting server of the foreign network FN acquires 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 terminal that does not support mobile IP Even so, it will be possible to communicate on a network that supports mobile IP using the same procedure as mobile IP.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a location registration procedure in 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 in the second embodiment of the present invention.
FIG. 6 is a sequence diagram showing a location registration procedure in 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 (part 1) for explaining a location registration procedure in a conventional mobile IP.
FIG. 9 is a block diagram (No. 2) for explaining a location registration procedure in a conventional mobile IP;
FIG. 10 is a block diagram (No. 3) for explaining a location registration procedure in a conventional mobile IP;
FIG. 11 is a block diagram (part 4) for explaining a location registration procedure in a 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

Claims (4)

In a data communication method in which a mobile terminal that has moved from a home network to a foreign network performs data communication with a partner terminal via the foreign network,
A procedure in which the mobile terminal transmits an access request and its identification information to the foreign network of the destination;
The foreign network that has received the access request and the identification information identifies the home network of the mobile terminal based on the identification information;
A procedure in which the foreign network transmits an authentication request based on the identification information to a home network of the mobile terminal;
When the home network that has received the authentication request authenticates the identification information, and the identification information is regular identification information, a procedure for transmitting an authentication response to the foreign network;
The foreign network that has received the authentication response requests the location registration of the mobile terminal to the home network;
The home network that has received the location registration request determines the IP address to be assigned to the mobile terminal and notifies the foreign network;
The mobile terminal, and transmitting an address request to the foreign network,
A foreign network that receives the address request includes a procedure for assigning an IP address notified from the home network to the mobile terminal. In a data communication method in which a mobile terminal that has moved from a home network to a foreign network performs data communication with a partner terminal via the foreign network,
A procedure in which the mobile terminal transmits an access request and its identification information to the foreign network of the destination;
The foreign network that has received the access request and the identification information identifies the home network of the mobile terminal based on the identification information;
A procedure in which the foreign network transmits an authentication request based on the identification information to a home network of the mobile terminal;
When the home network that has received the authentication request authenticates the identification information, and the identification information is regular identification information, a procedure for determining an IP address to be assigned to the mobile terminal and notifying the foreign network;
The mobile terminal, and transmitting an address request to the foreign network,
A foreign network that receives the address request includes a procedure for assigning an IP address notified from the home network to the mobile terminal. A procedure in which the home network of the mobile terminal receives data transmitted from the other terminal to the mobile terminal;
A procedure for the home network to identify a foreign network which is a current accommodation destination of the mobile terminal;
The home network forwards the received data with the foreign network as a care-of address;
The method according to claim 1 or 2, wherein the foreign network includes a procedure of transferring the received data to the mobile terminal. A procedure in which the foreign network receives data transmitted from the mobile terminal to the other terminal on the foreign network;
A procedure for the foreign network to identify a home network of the mobile terminal;
The foreign network forwards the received data with the home network as a care-of address;
The data communication method for a mobile terminal according to claim 1 or 2, wherein the home network includes a procedure for transferring the received data to a partner terminal.

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