JP2000102072A - Mobile communication method, mobile communication equipment and recording medium recording mobile communication program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile communication method capable of dynamically setting an IP address required for a movable radio terminal to perform communication at the time of authenticating the radio terminal. SOLUTION: A radio base station A-2 transfers a radio terminal authentication frame received from the radio terminal 4 to an authentication server 1, and the authentication server 1 authenticates whether or not it is a normal radio terminal from a radio terminal identifier inside the received radio terminal authentication frame. In the case of judging that it is a normal radio terminal, the authentication server 1 transmits a radio terminal authentication response frame including the IP address usable at the present point of time. The radio base station A-2 specifies the radio terminal from the radio terminal identifier of the received radio terminal authentication response frame and transmits the radio terminal authentication response frame to the radio terminal 4, and the radio terminal 4 obtains the IP address from the received radio terminal authentication response frame.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication method for communicating over a wide area IP network, and more particularly, to an IP address required for a moving wireless terminal to communicate at the time of wireless terminal authentication. The present invention relates to a dynamically set mobile communication method.

[0002]

2. Description of the Related Art A wireless terminal needs to be assigned an IP address in order to connect to an IP network. The method of assigning an IP address to a wireless terminal in the related art is a method of first performing authentication of a wireless terminal to which an IP address is to be assigned, and then simultaneously performing user authentication of the wireless terminal and assigning an IP address. Was.

With reference to FIG. 7, a description will be given of an authentication and IP address assignment procedure at the time of wireless terminal authentication according to the prior art. First, the wireless terminal 4 transmits a wireless terminal authentication frame to the wireless terminal authentication server 7 via the wireless base station 2. Next, the wireless terminal authentication server 7 authenticates the wireless terminal based on the wireless terminal identifier in the received wireless terminal authentication frame.
As a result, when it is determined that the terminal is a legitimate wireless terminal, a wireless terminal authentication response frame is transmitted to the wireless base station 2.

Next, the wireless base station 2 transmits a wireless terminal authentication response frame to the wireless terminal 4. Next, the wireless terminal 2
Transmits a user authentication frame to the user authentication server 8 via the wireless base station 2 in order to perform user authentication.

Next, when the user authentication server 8 determines that the user is a legitimate user, the user authentication server 8 transmits a user authentication response frame including the IP address. Next, the wireless base station 2 transmits a user authentication response frame to the wireless terminal 4. Thereby, the wireless terminal 4 can start the IP communication.

[0006]

However, in the mobile communication method shown in FIG. 7, after authentication of the wireless terminal 4, user authentication is performed and an IP address is assigned at the same time. For this reason, in order to acquire an IP address, it is necessary to separately perform authentication of the wireless terminal 4 and authentication of the user, and there is a problem that an overhead related to a time until communication starts is increased.

[0007] The present invention has been made in view of such circumstances, and a mobile communication method capable of dynamically setting an IP address required for a mobile radio terminal to communicate at the time of radio terminal authentication. It is an object of the present invention to provide a mobile communication device and a recording medium storing a mobile communication program.

[0008]

According to a first aspect of the present invention, when an authentication server accesses the Internet using a mobile IP terminal connected to a wireless terminal that performs wireless communication, the authentication server uses the mobile terminal. A mobile communication method for assigning an IP address to a wireless terminal, wherein the authentication server receives a wireless terminal authentication frame transmitted from the wireless terminal, and obtains a validity from a wireless terminal identifier in the wireless terminal authentication frame. If it is determined that the wireless terminal is a legitimate wireless terminal by performing authentication of the wireless terminal, for the wireless terminal,
A wireless terminal authentication response frame including an IP address that can be used at the present time is transmitted.

According to a second aspect of the present invention, the authentication server transmits the wireless terminal authentication frame based on whether or not the received IP address is included in the received wireless terminal authentication frame. It is determined whether the terminal has already obtained an IP address, and if the IP address is included, a wireless terminal authentication response frame is transmitted to the wireless terminal without assigning a new IP address,
When the IP address is not included, an IP address that can be used at the present time is assigned to the wireless terminal, and a wireless terminal authentication response frame is transmitted.

According to a third aspect of the present invention, an IP address is assigned to a wireless terminal when accessing the Internet using a mobile IP terminal connected to a wireless terminal that performs wireless communication. A mobile communication device, the mobile communication device authenticates the wireless terminal at the time of receiving a terminal authentication request from the wireless terminal, and simultaneously performs an IP required for the wireless terminal to access the Internet. An authentication server for assigning an address to the wireless terminal is provided.

According to a fourth aspect of the present invention, an IP address is assigned to a wireless terminal when accessing the Internet using a mobile IP terminal connected to a wireless terminal communicating wirelessly. A computer-readable recording medium recording a mobile communication program, wherein the mobile communication program receives a wireless terminal authentication frame transmitted from the wireless terminal, and performs authentication of the wireless terminal according to the content. I currently available
A process of selecting a P address, a process of registering the contents of the received wireless terminal authentication frame in a database in the authentication server, and transmitting a wireless terminal authentication response frame including the IP address to the wireless base station And when the wireless terminal erasure frame is received from the wireless base station, the content of the wireless terminal erasure frame is compared with information about the wireless terminal registered in the database, and according to the comparison result, And deleting the wireless terminal information registered in the database and transmitting a wireless terminal erasure response frame.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a mobile communication device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the embodiment. In this figure,
Reference numeral 1 denotes an authentication server that authenticates a terminal. Sign 2
Is a wireless base station that is connected to the authentication server 1 and communicates with terminals wirelessly. Although a plurality of wireless base stations are connected to one authentication server 1, only one wireless base station is shown here, and this wireless base station is referred to as a wireless base station A. Reference numeral 4 denotes a wireless terminal that performs wireless communication with the wireless base station A · 2. Reference numeral 5 denotes an IP terminal configured by a computer or the like connected to the wireless terminal 4. Reference numeral 6 denotes a network such as the Internet, which is referred to herein as the Internet.

The authentication server 1 and the radio base station A.2 are connected by wires, and the radio base station A.2 and the Internet 6 are connected by wires. Also, the wireless terminal 4 and the IP
The terminals 5 are also connected by wire.

Next, with reference to FIGS. 1 and 3, an operation of authenticating a terminal and assigning an IP address to the wireless terminal 4 will be described. FIG. 3 is a flowchart showing a procedure for assigning an IP address. 3A illustrates the procedure of the wireless terminal 4, FIG. 3B illustrates the procedure of the wireless base station A.2, and FIG. 3C illustrates the procedure of the authentication server 1.

First, the wireless terminal 4 transmits a wireless terminal authentication frame to the wireless base stations A and 2 using a wireless control communication link in order to establish a wireless user communication link (step S1). FIG. 5A shows the format of the frame transmitted at this time. The wireless terminal authentication frame includes a “wireless terminal identifier” and “IP address information”. Here, the “wireless terminal identifier” is “use
rID. 1 "and" IP address information "does not include data because no IP address is assigned.

Next, the wireless base station A.2 transfers the wireless terminal authentication frame received by the wireless control communication link to the authentication server 1 (step S2). At this time, the wireless base station A · 2 adds the “wireless base station identifier” to the wireless terminal authentication frame received from the wireless terminal 4 and transfers the frame to the authentication server 1. FIG. 5B shows a format of the wireless terminal authentication frame at this time. As shown in FIG. 5B, the “wireless base station identifier” is added to the end of the wireless terminal authentication frame received from the wireless terminal 4. Here, the “radio base station identifier” of the radio base station A · 2 is set to “I
D. α ”.

Next, the authentication server 1 communicates with the radio base station A.2
The wireless terminal 4 is authenticated based on the received wireless terminal authentication frame (step S3). At this time, the authentication server 1 determines whether or not the wireless terminal 4 is a legitimate wireless terminal 4 from the “wireless terminal identifier” (here, “userID.1”) in the received wireless terminal authentication frame. .

As a result, when it is determined that the wireless terminal 4 is a legitimate wireless terminal 4 and no data is included in the “IP address information”, it is determined that a new communication is to be started. Select an available IP address,
Further, this IP address is registered in a database in the authentication server 1 (step S4). FIG. 6A shows the configuration of a database for registering IP addresses. The database in the authentication server 1 includes “wireless terminal identifier”, “IP
The fields of “address” and “wireless base station identifier” are provided, and data is stored for each user who has requested authentication (“user 1” and “user 2” in this example).

Subsequently, the authentication server 1 communicates with the radio base station A.
Then, a wireless terminal authentication response frame including the issued IP address is transmitted to No. 2 (step S5). At this time,
The format of the wireless terminal authentication response frame is shown in FIG.
The format shown in (b) is used. Here, the “wireless terminal identifier” is “userID.1” and “IP
The “address information” is “IP.A”, and the “wireless base station identifier” is “ID.α”.

Next, the wireless base station A · 2 transmits the wireless terminal authentication response frame received from the authentication server 1 to the wireless terminal 4 via the wireless control communication link. At this time, the wireless base station A · 2 transmits the “wireless terminal identifier” and “IP
Only "address information" is sent. Thereby, the wireless base station A.2 establishes a wireless user communication link with the wireless terminal 4 (step S6).

Next, the radio terminal 4 receives the establishment of the radio user communication link with the radio base station A.2.
The assigned IP address is stored in the wireless terminal 4,
The IP communication starts (step S7).

By the operation described above, the wireless terminal 4
Is given an IP address from the authentication server 1 and can perform IP communication with the wireless base station A.2.

The acquisition of the IP address of the IP terminal 5 is performed by using a PPP (Point to Point Prot).
ocol) or Ethernet, the IP terminal 5 becomes a DHCP client, and the wireless terminal 4 becomes an IP address assignment server (DH).
IP terminal 5 becomes the IP server of the wireless terminal 4
This is done by getting the address. DH here
CP (DynamicHost Configurat)
The ion protocol (dynamic host configuration protocol) server is a server that performs an operation of assigning an IP address in response to a request from a DHCP client. As a result, the IP address is held by the wireless terminal 4, so that the IP terminal 5 connected to the wireless terminal 4 can be changed to another model or the like.

Next, the operation when the wireless terminal 4 moves will be described with reference to FIGS. FIG. 2 is a block diagram showing a configuration of another embodiment, in which the configuration shown in FIG.
Is different from the configuration shown in FIG. 3 in that the radio base station B.3 is illustrated.
And the authentication server 1 by wire.

In the following description, it is assumed that the radio terminal 4 and the IP terminal 5 have moved from the communication area of the radio base station A-2 to the communication area of the radio base station B-3.

FIG. 4 is a flowchart showing a procedure when the radio terminal 4 moves. 4, (d) shows the procedure of the wireless terminal 4, (e) shows the procedure of the wireless base station B3, (f) shows the procedure of the authentication server 1,
(G) shows the procedure of the radio base station A.2.

First, the wireless terminal 4 transmits a wireless terminal authentication frame to the wireless base station B3 using the wireless control communication link to establish a wireless user communication link (step S11). FIG. 5A shows the format of the frame transmitted at this time. The wireless terminal authentication frame includes a “wireless terminal identifier” and “IP address information”. Here, the “wireless terminal identifier” is “use
rID. 1 ”and“ IP address information ”is“ IP.
A ". This IP address" IP. A ″ is an IP address given by the authentication server 1 at the time of starting communication.

Next, the wireless base station B3 transfers the wireless terminal authentication frame received by the wireless control communication link to the authentication server 1 (step S12). At this time, the wireless base station B · 3 adds a “wireless base station identifier” to the wireless terminal authentication frame received from the wireless terminal 4,
Transfer to the authentication server 1. FIG. 5B shows a format of the wireless terminal authentication frame at this time. As shown in FIG. 5B, the “wireless base station identifier” is added to the end of the wireless terminal authentication frame received from the wireless terminal 4. Here, the “radio base station identifier” of the radio base station B · 3 is set to “I
D. β ”.

Next, the authentication server 1 communicates with the radio base station B · 3
Based on the received wireless terminal authentication frame, authentication of the wireless terminal 4 is performed (step S13). At this time, the authentication server 1 determines from the “wireless terminal identifier” (here, “userID.1”) in the received wireless terminal authentication frame
It is determined whether the wireless terminal 4 is a legitimate wireless terminal. As a result, if it is determined that the terminal is a legitimate wireless terminal, and the “IP address information” includes the already assigned IP address, the authentication server 1 transmits the database in the authentication server 1 (see FIG. 6B). The content of the field of "wireless base station identifier" is updated (step S14). Here, the “wireless base station identifier” is changed to “ID.β”.

Subsequently, the authentication server 1 sends the IP address (here, “I”) included in the wireless terminal authentication frame.
P. A ″) is transmitted to the wireless base station B · 3 using the wireless terminal authentication response frame (step S15).
The format of the wireless terminal authentication response frame is shown in FIG.
The format shown in (b) is used. Here, the “wireless terminal identifier” is “userID.1” and “IP
The “address information” is “IP.A”, and the “wireless base station identifier” is “ID.β”.

Next, the wireless base station B 3 transmits the wireless terminal authentication response frame received from the authentication server 1 to the wireless terminal 4 via the wireless control communication link. At this time, the wireless base station B · 3 transmits the “wireless terminal identifier” and “IP
Only "address information" is sent. Thereby, the wireless base station B3 establishes a wireless user communication link with the wireless terminal 4 (step S16).

Next, the radio terminal 4 receives the establishment of the radio user communication link with the radio base station B · 3,
The IP communication starts (step S17).

As described above, even when the wireless terminal 4 moves, the same IP address as the already assigned IP address is assigned again, so that the wireless terminal 4 can continue communication.

Next, the operation of the radio base station A · 2 that has been performing IP communication before the radio terminal 4 moves will be described. First, when the wireless base station A · 2 cannot confirm the managed wireless terminal 4, it transmits a wireless terminal erasure frame to the authentication server 1 (step S18). At this time, the wireless base station A · 2 determines whether or not the wireless terminal 4 is within the communication area based on the intensity of the radio wave from the wireless terminal 4 or the like. However, the wireless terminal erasure frame is transmitted after waiting for a predetermined time after the wireless terminal 4 cannot be confirmed. This is because the wireless terminal 4 moves to the communication area of another wireless base station, and the authentication server 1 performs the authentication operation of this wireless terminal 4 (steps S11 to S1 shown in FIG. 4).
This is because it is necessary to wait for the time required for 5).
Therefore, the waiting time may be longer than the time required for the authentication server 1 to authenticate the wireless terminal 4.

In the wireless terminal erasure frame, based on the frame format shown in FIG. 5B, the “wireless terminal identifier” becomes “userID.1”, the “IP address information” becomes “IP.A”, and “wireless”. Base station identifier is "
ID. α ”.

Next, the authentication server 1 receives the wireless terminal erasure frame, and determines whether the data in this frame is the same as the data in the database (see FIG. 6B) in the authentication server 1. Judge. At this time, the authentication server 1
Searches for data in which the content of the “wireless terminal identifier” in the wireless terminal erasure frame (here, “userID.1”) is the same as the content of the “wireless terminal identifier” in the database, and searches for the “wireless terminal identifier”. It is determined whether or not the content of the “wireless base station identifier” (here, “ID.β”) corresponding to “” and the content of the “wireless base station identifier” in the wireless terminal erasure frame are the same.

As a result of this judgment, when the content of the “wireless base station identifier” is different, it is a case where the wireless terminal 4 has moved, and the authentication server 1 sends the wireless terminal erasure response frame to the wireless base station A · 2. (Step S19). This wireless terminal erasure response frame transmits the same contents as the wireless terminal erasure frame.

On the other hand, when the "radio base station identifiers" are the same, it means that the radio terminal 4 has finished communication or has gone out of the communication area of all the radio base stations. At this time,
The wireless terminal 4 deletes the IP address assigned by the authentication server 1 and stored in the wireless terminal 4. When the wireless terminal 4 starts IP communication again, it transmits a wireless terminal authentication frame to the authentication server 1 again,
IP communication is started after a new IP address is assigned. When the “wireless base station identifier” is the same, the authentication server 1 deletes the data having the “wireless terminal identifier” of the wireless terminal 4 from the database in the authentication server 1. Further, the authentication server 1 can use the IP address (here, “IP.A”) issued to the wireless terminal 4. Subsequently, the authentication server 1 transmits a wireless terminal erasure response frame having the same content as the received wireless terminal erasure frame to the wireless base station A.2. With this operation, the IP address used by the wireless terminal 4 up to the present time can be used by another wireless terminal.

As described above, even when the wireless terminal 4 moves, the IP address is assigned at the time of wireless terminal authentication, so that the time until the start of communication can be reduced.

A program for implementing the steps shown in FIGS. 3 and 4 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read by a computer system and executed. Terminal authentication processing in mobile communication may be performed. Here, the “computer system” includes an OS and hardware such as peripheral devices. Also,
"Computer readable recording medium" means a floppy disk, a magneto-optical disk, a ROM, a CD-ROM.
And a storage device such as a hard disk built in a computer system.

A "computer-readable recording medium" is a program that is dynamically transmitted for a short period of time, such as a communication line for transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a program that holds a program for a certain period of time, such as a volatile memory in a computer system serving as a server or a client in that case, is also included. Further, the program may be for realizing a part of the functions described above, or may be for realizing the functions described above in combination with a program already recorded in the computer system.

The function of the wireless terminal 4 may be provided by the IP terminal 5, or the function of the IP terminal 5 may be provided by the wireless terminal 4.

[0043]

As described above, according to the present invention, an IP address is assigned at the time of authentication of a wireless terminal, so that the overhead for assigning an IP address can be reduced. Is obtained.

According to the present invention, authentication is performed based on the wireless terminal identifier held by the wireless terminal, and since the wireless terminal holds the IP address, the IP terminal connected to the wireless terminal can be changed. The effect is obtained.

Further, according to the present invention, an available IP address is assigned at the time of issuing the IP address, so that an effect that the IP address can be used effectively can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of another embodiment of the present invention.

FIG. 3 is a flowchart showing an operation of the embodiment shown in FIG. 1;

FIG. 4 is a flowchart showing an operation of the embodiment shown in FIG. 2;

FIG. 5 is an explanatory diagram showing a frame format when transmitting and receiving data.

FIG. 6 is an explanatory diagram showing a configuration of a database in the authentication server 1 shown in FIGS.

FIG. 7 is a block diagram showing a configuration of a conventional technique.

[Explanation of symbols]

1 ... Authentication server, 2 ... Wireless base station A, 3 ...
Wireless base station B, 4 ... wireless terminal, 5 ... IP terminal,
6 ... Internet, 7 ... Wireless terminal authentication server, 8 ... User authentication server.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Junichi Murayama 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Within Japan Telegraph and Telephone Corporation (72) Inventor Naoya Kugutsu 3--19, Nishishinjuku, Shinjuku-ku, Tokyo No. 2 Inside Nippon Telegraph and Telephone Corporation (72) Inventor Hiroyuki Hara Within Nippon Telegraph and Telephone Corporation 3-19-2 Nishi Shinjuku, Shinjuku-ku, Tokyo

Claims (4)

[Claims] 1. A mobile communication method wherein an authentication server assigns an IP address to a wireless terminal when accessing the Internet using a mobile IP terminal connected to a wireless terminal performing wireless communication. The authentication server receives the wireless terminal authentication frame transmitted from the wireless terminal, performs authentication based on the wireless terminal identifier in the wireless terminal authentication frame to determine whether the wireless terminal is a legitimate wireless terminal A mobile communication method comprising: transmitting a wireless terminal authentication response frame including a currently available IP address to the wireless terminal when it is determined that the wireless terminal is a legitimate wireless terminal. 2. The authentication server according to claim 1, further comprising:
It is determined whether or not the wireless terminal that transmitted the wireless terminal authentication frame has already acquired an IP address, depending on whether or not the P address is included. A wireless terminal authentication response frame is transmitted without assigning a new IP address. If no IP address is included, a wireless terminal authentication response frame is given by assigning an IP address that can be used at the present time to the wireless terminal. The mobile communication method according to claim 1, further comprising transmitting a frame. 3. A mobile communication device for assigning an IP address to a wireless terminal when accessing the Internet using a mobile IP terminal connected to a wireless terminal performing wireless communication, The mobile communication device, upon receiving a terminal authentication request from the wireless terminal, performs authentication of the wireless terminal and simultaneously transmits an IP address necessary for the wireless terminal to access the Internet to the wireless terminal. A mobile communication device, comprising: an authentication server for assigning a mobile communication device. 4. A computer storing a mobile communication program for assigning an IP address to a wireless terminal when accessing the Internet using a mobile IP terminal connected to a wireless terminal performing wireless communication. A readable recording medium, wherein the mobile communication program receives a wireless terminal authentication frame transmitted from the wireless terminal, and performs authentication of the wireless terminal according to the content thereof.
Selecting a currently available IP address; registering the contents of the received wireless terminal authentication frame in a database in the authentication server; and transmitting a wireless terminal authentication response frame including the IP address to the wireless base station. The process of transmitting to the station and, when a wireless terminal erasure frame is received from the wireless base station, comparing the content of the wireless terminal erasure frame with information on the wireless terminal registered in the database, A process of deleting information of the wireless terminal registered in the database according to the comparison result, and transmitting a wireless terminal erasure response frame; and a mobile communication program recorded thereon.