JPH11313374A - Mobile data communication system, its mobile terminal set and data communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the mobile data communication system that makes re- connection processing without the need for troublesome entry operations in the case of re-connecting a mobile terminal set and a data communication equipment. SOLUTION: A mobile terminal set PS1 monitors whether or not a base station CS1 to be connected is switched to other base station CS2, informs a gateway GW of the result of detection so that the gateway GW recognizes whether the mobile terminal set PS1 is new connection or re-connection to a server system AS. When the connection is new, the mobile terminal set PS1 and the gateway GW send/receive authentication information and the mobile terminal set PS1 and the gateway GW store the authentication information to an authentication information storage section and an information storage section respectively and the authentication processing is executed for re- connection by using the authentication information stored in the authentication information storage section and the information storage section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to, for example, PHS
The present invention relates to a mobile data communication system capable of performing data communication between a mobile terminal device and a server device connected to a communication network using a (Personal Handy-phone System), and a mobile terminal device and a data communication device.

[0002]

2. Description of the Related Art In recent years, digital mobile communication systems typified by cellular telephone systems and PHS have rapidly become widespread. In this type of system, in addition to a voice communication service, provision of a data communication service using a personal computer connected to a mobile phone or a portable information terminal having a wireless communication function has been started.

For example, when a user wants to obtain desired information from an information provider on a computer network such as the Internet, a call is made from the portable information terminal to the desired information provider. Then, first, the portable information terminal and the nearest base station are connected via a wireless line, and subsequently the information provider's server is accessed from the base station via a public network and the Internet. When a communication path is established between the portable information terminal and the server, information according to the request of the portable information terminal is transmitted from the server to the portable information terminal via the communication path.

In a mobile communication system having such a data communication service function, for example, a PPP (Point-to-Point Protocol) is provided between a mobile terminal device PS1 and a server device AS according to a sequence shown in FIG.
), A connection is established, an authentication process is performed, and then data communication is performed.

In FIG. 11, when a mobile terminal device PS1 makes a call to a server device AS, a call connection is established between a base station CS1 and the mobile terminal device PS1, and the base station CS1
A connection is established between the server and the server apparatus AS. When the call connection and the connection establishment are completed, the mobile terminal device PS1 sends an authentication request signal to the server device AS using the input user ID / password, and the corresponding mobile terminal device stored by itself in the server device AS. PS
The authentication processing is executed by reading out the passwords of No. 1 and checking these passwords. Here, the server AS
Transmits an authentication response signal including the determination result to the mobile terminal device PS1 when the mobile terminal device PS1 is determined to be a valid user, and thereafter performs data communication with the mobile terminal device PS1. When it is determined that the mobile terminal device PS1 is an unauthorized user, the mobile terminal device transmits an authentication response signal including the determination result to the mobile terminal device PS1 and disconnects the connection with the base station CS1.

However, in the authentication procedure shown in the above sequence, even if the mobile terminal device PS1 is newly connected to the server device AS, the mobile terminal device PS1 is reconnected by switching to another base station due to user movement or the like. Also server device A
Each time data communication is performed with S, the user performs a new password input and performs authentication processing. Therefore, during data communication with the server device AS,
When switching to another base station, the user has to perform a troublesome operation of having to input a password each time.

[0007]

As described above, in the above-described mobile communication system, the authentication process must be performed by inputting the password every time the mobile terminal device is newly connected and re-connected to the server. Therefore, when switching to another base station during data communication, a troublesome operation is required to perform continuous data communication.

[0008] An object of the present invention is to provide a mobile data device that can reliably perform a reconnection process without forcing a user to perform a troublesome input operation, for example, when reconnecting a mobile terminal device and a data communication device. An object of the present invention is to provide a communication system, a mobile terminal device and a data communication device.

[0009]

SUMMARY OF THE INVENTION The present invention provides at least one base station device constituting a wireless area, a mobile terminal device connected to the base station device via a radio line, A mobile data communication system including a data communication device connected via a communication network including a line, and performing data communication between a mobile terminal device and a data communication device.

[0010] In order to achieve the above object, during data communication between the mobile terminal device and the data communication device,
The mobile terminal device detects whether switching of the base station device to be connected has occurred, and based on the detection result, determines whether the connection between the data communication device and the mobile terminal device is a new connection or whether the base station device to be connected is connected. Connection state determining means for determining whether or not the connection is a reconnection by switching, and when the connection state determining means determines that the connection is a new connection, a connection is set between the mobile terminal apparatus and the data communication apparatus, and authentication is performed. Authentication processing means for notifying and / or acquiring information and performing authentication processing, authentication information storage means for storing authentication information used by this authentication processing means, and connection state determination means determining reconnection. In the case where the mobile terminal device and the data communication device perform authentication processing using the authentication information stored in the authentication information storage unit, a reconnection authentication processing unit may be provided. It is.

[0011] According to this configuration, the mobile terminal device monitors whether or not the switching has occurred in the connected base station,
This detection result is notified to the data communication device, and the data communication device determines whether the mobile terminal device is a new connection or a reconnection to the data communication device based on the detection result notified from the mobile terminal device. You can judge. If the result of this determination is a new connection, authentication information including individual key information assigned in advance to the mobile terminal device for each base station device is exchanged between the mobile terminal device and the data communication device. In this way, the authentication processing is executed, and the mobile terminal device and the data communication device store the authentication information in the authentication information storage means. If the determination result indicates reconnection, the stored authentication information is used. Then, the authentication process is executed.

As a result, even in a system in which a different password is used for each connection, the above-described authentication processing is performed at the time of reconnection. Reconnection with the data communication device becomes possible, so that the user does not need to perform any troublesome work such as inputting a password.

Further, the mobile terminal device according to the present invention performs the authentication processing by notifying and / or acquiring the line control command or the authentication information input by the data link authentication procedure at the time of a new connection. Therefore, even when the mobile terminal device is a separate type terminal, the authentication process can be executed by the above authentication procedure, and the security of the password of the mobile terminal user can be improved by the above authentication procedure, for example. .

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram showing an embodiment of a mobile data communication system according to the present invention, and CS1 to CSn indicate base stations. These base stations CS1 to CSn are geographically distributed in a service area covered by the system,
Each forms a wireless area called a cell.

The mobile terminal devices PS1 to PSm are connected to the nearest base station via a radio line in the cell formed by each of the base stations CS1 to CSn. As a wireless access method between the base station and the mobile terminal device, for example, TDMA-TDD (Time Division Multiple Access-
Time Division Duplex) method is used. The mobile terminal devices PS1 to PSm include a mobile information terminal having a data communication function and a wireless access function, and a mobile terminal device having a personal computer PC connected to the mobile phone, in addition to a mobile phone having only a call function.

Each of the base stations CS1 to CSn is connected to a communication network via a wired line. The communication network is an integrated services digital network (ISDN) IN1 and this IDN.
An I 'interface network IN2 for accommodating each of the base stations CS1 to CSn in the SDN IN1;
And A computer network, an in-house network, and the like are connected to the communication network in addition to many subscriber wire terminal devices. A gateway GW as a data relay device is connected to the ISDN IN1 and the leased line network PN, and the server device A is connected via the gateway GW.
S is connected. For this reason, when the Internet is performed, the mobile terminal devices PS1 to P1 as well as the subscriber wired terminals are used by using the TCP / IP protocol.
Access is also possible from Sm.

The server device AS has a function of downloading various information in response to a request from the subscriber's wired terminal and the mobile terminal devices PS1 to PSm. Next, the configuration and operation of each device of the mobile data communication system will be described with reference to FIGS. FIG. 2 is a circuit block diagram of the mobile terminal devices PS1 to PSm, FIG. 3 is a diagram showing a configuration of a connection request signal transmitted from the mobile terminal devices PS1 to PSm, and FIG. C
FIG. 5 is a circuit block diagram of S1 to CSn, and FIG. 5 is a circuit block diagram of the gateway GW.

First, the configuration of each of the mobile terminal devices PS1 to PSm will be described with reference to FIG. 2. The radio unit 1 having the antenna 11, the modem unit 2, the TDMA unit 3, the communication unit 4, the control unit 5, information storage unit 6, data communication unit 7
And

That is, the radio carrier signals arriving from the base stations CS1 to CSn are received by the antenna 11 and then input to the receiving unit 13 via the high frequency switch (SW) 12 of the radio unit 1. In the receiving unit 13, the received radio carrier signal is mixed with the local oscillation signal generated from the synthesizer 14 and down-converted into a received intermediate frequency signal. The local oscillation signal frequency generated from the synthesizer 14 is instructed by the control unit 5 to a value corresponding to the radio channel frequency. Also, the wireless unit 1
Is provided with a reception field strength detection unit (RSSI) 16. In the reception electric field strength detection unit 16, the mobile station PS1
The received electric field strength of the wireless carrier signal arriving from .about.PSm is detected, and the detected value is notified to the control unit 5 to judge and display the reception quality, for example.

The received intermediate frequency signal output from the receiving unit 13 is input to the demodulation unit 21 of the modem unit 2. The demodulation section 21 performs digital demodulation of the received intermediate frequency signal, thereby reproducing a digital demodulated signal.

The TDMA decoding section 31 of the TDMA section 3
Separates the digital demodulated signal for each reception time slot. If the data of the separated slot is audio data, the audio data is transmitted to the interface unit 4.
To enter. On the other hand, if the data of the separated slot is unrestricted digital data or control data, these data are input to the data communication unit 7.

The communication unit 4 has an ADPCM (Adaptive Diff).
erential Pulse Code Modulation) Transcoder 41
, A PCM codec 42, a speaker 43, and a microphone 44. The ADPCM transcoder 41 decodes the audio data output from the TDMA decoding unit 31. The PCM codec 42 uses the A
The digital audio signal output from the DPCM transcoder 41 is converted into an analog signal, and this audio signal is output from the speaker 43 as loudspeaker.

The data communication unit 7 receives the data supplied from the code unit 31 by the TDMA, and supplies the data to the control unit 5. If the received data is control data, the control unit 5 analyzes the control data and performs necessary control.
On the other hand, if the received data is information data coming from a server or the like, this information data is stored in the information storage unit 6 and supplied to the display unit 8 for display.

On the other hand, the voice signal of the user input to the microphone 44 is PCM-coded by the PCM codec 42, and is further compression-coded by the ADPCM transcoder 41. Then, the encoded audio data is TDM
It is input to the A encoding unit 32. The control data and information data output from the control unit 5 are input to the TDMA encoding unit 32 via the data communication unit 7.

[0025] The TDMA encoding section 32
The digital audio data of each channel output from the CM transcoder 41 and the control data and information data output from the data communication unit 7 are inserted into a transmission time slot designated by the control unit 5 and multiplexed. Modulation unit 2
2 digitally modulates the transmission intermediate frequency signal with the multiplexed digital communication signal output from the TDMA encoding unit 32, and inputs the modulated transmission intermediate frequency signal to the transmission unit 15.

The transmitting section 15 mixes the modulated transmission intermediate frequency signal with a local oscillation signal generated from the synthesizer 14, upconverts the mixed signal into a radio carrier frequency, and further amplifies the signal to a predetermined transmission power level. The radio carrier signal output from the transmitting unit 15 is transmitted from the antenna 11 via the high frequency switch 12 to the base stations CS1 to CSn.
Sent to

The control unit 5 includes, for example, a microcomputer as a main control unit. In addition to a wireless connection control function, a call control function, a data communication control function, and the like, a base station switching determination unit 51 and an authentication processing control unit 52 and an authentication information receiving means 53.

Among them, the base station switching determining means 51 performs the data communication with the server apparatus AS during the data communication with the server apparatus AS.
It monitors whether or not the switching of n has occurred, and notifies the gateway GW of the detection result as discrimination information.

When the base station switching determining means 51 detects that a new connection has been established, the authentication processing control means 52 communicates with the gateway GW via the radio line and the base stations CS1 to CS1.
The authentication processing is executed by notifying and / or acquiring the authentication information obtained by the authentication information receiving means 53 via the connection set between Sn and the gateway GW. At the same time, the authentication information is stored in the authentication information storage unit 61 of the information storage unit 6. The authentication processing control means 52 includes a base station switching determination means 51.
When it is detected that the connection is re-established by the gateway G, the authentication information stored in the authentication information
An authentication process is performed with W.

The authentication information receiving means 53 causes the authentication information received from the input unit 9 to be used for the authentication processing of the authentication processing control means 52. The input unit 9 includes a dial key,
It contains a transmission key, various function keys, a handwriting input unit, and the like, and further includes an authentication information input unit 91 for inputting authentication information including individual key information such as a password from the outside by a user. The authentication information input by the authentication information input unit 91 is received by the authentication information receiving unit 53 of the control unit 5.

Next, the configuration of base stations CS1 to CSn will be described with reference to FIG. The base stations CS1 to CSn are:
A radio unit 10 having an antenna 111 and a modem unit 20
, A TDMA unit 30, an interface unit 40, a control unit 50, an information storage unit 60, and a data communication unit 70.

That is, the radio carrier signals arriving from the mobile terminal devices PS1 to PSm are received by the antenna 111 and then input to the receiving unit 113 via the high frequency switch (SW) 112 of the radio unit 10. The receiving unit 113 converts the received wireless carrier signal into the synthesizer 11
4 and down-converted into a received intermediate frequency signal. The local oscillation frequency generated by the synthesizer 114 is instructed by the control unit 50 according to the radio channel frequency. Also, the radio unit 10 includes a reception field strength detection unit (RSSI) 1
16 are provided. This reception electric field strength detection section 116
Then, the received electric field strength of the radio carrier signal arriving from the mobile terminal devices PS1 to PSm is detected, and the detected value is notified to the control unit 50 for a free channel search, a handover of the mobile terminal device, and the like.

The received intermediate frequency signal output from the receiving section 113 is input to the demodulation section 221 of the modem section 20. The demodulation section 221 performs digital demodulation of the received intermediate frequency signal, thereby reproducing a digital demodulated signal.

The TDMA decoding section 33 of the TDMA section 30
1 separates the digital demodulated signal for each reception time slot. If the data of the separated slot is audio data, the audio data is input to the interface unit 40. On the other hand, if the data of the separated slot is unrestricted digital data or control data, these data are input to the data communication unit 70.

The interface unit 40 has an ADPCM (A
daptive Differential Pulse Code Modulation) transcoder 441, public line interface 442,
And a dedicated line interface 443. ADP
The CM transcoder 441 decodes the audio data output from the TDMA decoding unit 331. AD above
The digital audio signal decoded by the PCM transcoder 441 is transmitted from the public line interface 442 to the I ′ network I
It is sent to N2. The public line interface 442 is
According to the instruction of the control unit 50, the call connection processing and the data communication with the I ′ network IN2 are performed. Dedicated line interface 4
43 performs call connection processing and data communication with the leased line network PN in accordance with instructions from the control unit 50.

The data communication unit 70 is connected to the mobile terminal PS1.
If the data arriving from .about.PSm is control data addressed to the own station, the control data is input to the control unit 50. Control unit 5
0 performs a connection opening control described later and a data transfer control by TCP / IP or the like based on the control data. On the other hand, if the data arriving from the mobile terminal devices PS1 to PSm is data addressed to the external communication network, the data communication unit 70 transmits this data to the I ′ network IN via the public line interface 442 or the dedicated line interface 443.
2 or to the dedicated line network PN.

On the other hand, digital communication signals of a plurality of channels arriving from the I 'network IN2 are received by the public line interface 442, respectively. If the digital communication signal is audio data, the digital communication signal is subjected to compression encoding processing by the ADPCM transcoder 441 and is input to the TDMA encoding unit 332. On the other hand, if the digital communication signal is control data or information data, it is input to the data communication unit 70.

The data communication unit 70 determines that the destination of the input control data and information data is
Sm, the control data and the information data are
Input to the A encoding unit 332. On the other hand, if the input data is data addressed to the own station, the data is input to the control unit 50. The control unit 50 analyzes the input data and performs various controls. Further, the control unit 50 inputs control data addressed to the mobile terminal devices PS1 to PSm to the TDMA encoding unit 332 via the data communication unit 70.

The digital communication signals of a plurality of channels arriving from the leased line network PN are
Each of them is received at 43, and thereafter inputted to the data communication unit 70. If the destination of the control data and information data included in the input digital communication signal is the mobile terminal device PS1 to PSm, the data communication unit 70 encodes the control data and information data into the TDMA encoding unit 3.
Enter 32. On the other hand, if the input data is data addressed to the own station, the data is input to the control unit 50. The control unit 50 analyzes the input data and performs various controls. The control unit 50 includes the mobile terminal devices PS1 to PS1.
The control data addressed to PSm is input to the TDMA encoding unit 332 via the data communication unit 70.

[0040] The TDMA encoding unit 332 converts the AD
The digital audio data of each channel output from the PCM transcoder 441 and the information data and control data output from the data communication unit 70 are inserted and multiplexed in the transmission time slot specified by the control unit 50. The modulating unit 222 is configured by the TDMA encoding unit 332
The transmission intermediate frequency signal is digitally modulated by the multiplexed digital communication signal output from, and the modulated transmission intermediate frequency signal is input to transmission section 115.

The transmitting section 115 mixes the modulated transmission intermediate frequency signal with the local oscillation signal generated from the synthesizer 114, upconverts the signal into a radio carrier frequency, and further amplifies the signal to a predetermined transmission power level. The wireless carrier signal output from the transmitting unit 115 is transmitted from the antenna 111 to the mobile terminal devices PS1 to PSm via the high frequency switch 112.

The control unit 50 has a microcomputer as a main control unit. The control unit 50 performs general control processing of each circuit based on a program or the like stored in the information storage unit 60, and has a control function. , A connection processing control unit 551 and a wireless control unit 552.

When the mobile terminal devices PS1 to PSm perform data communication with the server device AS, the connection processing control means 551 communicates with its own station according to a protocol execution program stored in the information storage unit 60. Control for opening or disconnecting a connection with the gateway GW is executed.

The radio control means 552 exchanges information necessary for establishing a connection with the mobile terminal devices PS1 to PSm when establishing the connection. Next, the gateway GW will be described with reference to FIG.

That is, the gateway GW includes a line interface unit 711 and a dedicated line interface unit 712.
, A packet communication control unit 713, a routing table unit 714, a buffer unit 715, a network interface unit 716, and a device control unit 717. These circuits are connected to each other via a control bus.

Here, the line interface unit 711 is
In accordance with an instruction from the device control unit 717, call connection processing and data communication are performed for a circuit switching network that integrates the ISDN IN1 and the I 'network IN2. The leased line interface unit 712, in accordance with the instruction of the device control unit 717,
A call connection process and data communication for N are performed. The network interface unit 716 performs a call connection process and data communication with the server device AS in accordance with an instruction from the device control unit 717.

The packet communication control unit 713 stores the packet data coming from the server device AS in the packet storage unit 71.
31. Then, in accordance with an instruction from the device control unit 717, if the data arrived from the server device AS is control data addressed to the own device, the control data is input to the device control unit 717. Then, the device control unit 717 performs connection opening control, data transfer control by TCP / IP or the like based on the control data. In contrast, server device A
If the data arriving from S is data addressed to the external communication network, the packet communication control unit 713 transmits the data to the line interface unit 711 or the dedicated line interface unit 7.
12 to the communication network.

The buffer unit 715 is provided with a line interface unit 711 or a dedicated line interface unit 712.
Stores data arriving via. Here, if the incoming data is control data addressed to the own device, the control data is input to the device control unit 717, and thereafter, connection control for connection with the base station devices CS1 to CSn and T
It is used for processing such as data transfer control by CP / IP or the like.

The device control unit 717 performs general control of each circuit by using a microcomputer as a main control unit.
7a, a connection state determination unit 717b, and an authentication processing control unit 717c.

The connection processing means 717a performs processing for establishing a connection on the communication network between the base stations CS1 to CSn. The connection state judging means 717b communicates with the base stations CS1 to CSn and the gateway GW.
With a connection established on the communication network between
The data arriving via the line interface unit 711 or the dedicated line interface 712 is transmitted to the mobile terminal PS.
If the information is the discrimination information relating to the switching of the base stations CS1 to CSn from 1 to PSm, it is determined from the discrimination information whether the connected mobile terminal devices PS1 to PSm are new connection or reconnection. Then, when it is determined that the connection is a new connection, the authentication processing control unit 717c transmits the mobile terminal devices PS1 to PSm to the mobile terminal devices PS1 to PSm via the wireless line and the connection with the mobile terminal devices PS1 to PSm. By notifying and / or obtaining authentication information including individual key information assigned in advance to
At the same time as executing the authentication process, it generates routing information including information indicating a data transmission path between the mobile terminal device to which the connection is set and the server device AS, and registers the routing information in the routing table unit 714. At the same time, the authentication information is stored in the information storage unit 718.

Further, the authentication processing control means 717c provides the mobile terminal device PS which has requested connection by the connection state determination means 717b.
When it is determined that 1 to PSm is a reconnection, the authentication information used at the time of the new connection is read from the information storage unit 718, and the mobile terminal apparatus that has made a connection request using the authentication information is read out. Execute the authentication process. At the same time, the routing information registered in the routing table unit 714 is changed to routing information including information indicating a data transmission path between the mobile terminal device newly connected to the base station and the server device AS.

Next, an authentication processing operation by the system configured as described above will be described with reference to FIGS. Here, the case where mobile terminal apparatus PS1 performs data communication with server apparatus AS in the cell of base station CS1 will be described as an example. FIG. 5 is a sequence diagram showing the procedure.

When the mobile terminal device PS1 calls the server device AS, a call connection is made between the base station CS1 and the mobile terminal device PS1, and the base station CS1 and the gateway G are connected.
A connection is established with W (A1).

At the time of a new connection, the mobile terminal PS
The first authentication processing control means 52 stores an authentication request signal including a user input user ID and password as shown in FIG. 6A in the authentication information storage unit 61 (A2).
Send to gateway GW.

The gateway GW receives the authentication request signal, extracts control information as discrimination information, and confirms that the connection is a new connection. Thereafter, the gateway GW stores the relevant information stored in the information storage unit 718 or the like. Authentication is performed by collating with the password of the mobile terminal device (A3).
Here, when determining that the mobile terminal device PS1 is a valid user, the gateway GW stores the user ID / password in the information storage unit 718 and an authentication response signal including the determination result (FIG. 6C). ) To the mobile terminal device P
It returns to S1 (A4). Thereafter, data communication is performed between the mobile terminal device PS1 and the server device AS.

If the user is an illegal user, the gateway GW disconnects the connection with the base station CS1. In addition, the base station switching determination means 51 of the mobile terminal device PS1 determines whether another base station C has been detected due to movement of the user during data communication.
When it is determined that the mobile terminal device PS1 has been switched to S2 (A5), the mobile terminal device PS1 calls the server device AS and transmits the call to the base station C.
A call connection is made with S1. At the same time, base station C
A connection is established between S1 and the gateway GW (A6).

Then, the mobile terminal device PS1 transmits an authentication request signal (FIG. 6 (b)) including the user ID and password stored in the authentication information storage unit 61 to the gateway GW (A7). Then, the gateway GW receives the incoming authentication request signal, extracts the control information by the connection state determination unit 717b, checks whether the connection is reconnection, and then checks the user ID included in the authentication request signal. Password and user ID stored in the information storage unit 718
Authentication is performed by checking the password (A
8).

Here, if it is determined that the user is a valid user, the connection processing means 717 of the gateway GW
a disconnects the connection with the base station CS1,
An authentication response signal including the determination result is transmitted to the mobile terminal device PS1 via the base station CS2. Thereafter, the mobile terminal device PS1 that has received the authentication response signal can perform data communication with the server device AS through the connection with the base station CS2. If the user is an illegal user, the connection processing means 717a of the gateway GW disconnects the connection with the base station CS2.

In the above example, the determination as to whether the mobile terminal device PS1 that has made the connection request is a new connection or a reconnection is made using the control information included in the authentication request signal. The determination may be made from the contents of the ID, or may be made by notifying information for determining whether the connection is a new connection or a reconnection at the time of establishing a connection.

Further, the internal processing of the mobile terminal device PS1 will be described with reference to the flowchart of FIG. First, the mobile terminal device PS1 detects whether or not the base station CS1 to be connected has been switched by the base station switching determination means 51 (step S11), and based on the detection result, newly connects or reconnects to the server device AS. (Step S
12). Here, if the connection is a new connection, the authentication information input unit 91 acquires a user ID and password by user input (step S13), and stores the user ID and password in the authentication information storage unit 61 (step S13).
14), the user ID and password are included in the authentication request signal and transmitted to the gateway GW, and an authentication process is performed with the gateway GW (step S15).

When the base station switching determination means 51 determines that the connection is reconnection, the mobile terminal device PS1 reads the user ID and password stored in the authentication information storage section 61 (step S16). , This user ID
An authentication process is performed with the gateway GW using the password.

The operation of accumulating the user ID / password in the mobile terminal device PS1 in the authentication information storage unit 61 is an operation of the integrated terminal.
The operation of storing the D password in the authentication information storage unit 61 operates according to the procedure shown in the sequence of FIG.

That is, when a new connection is established, the mobile terminal P
Before establishing a connection between S1 and the server apparatus AS, the user ID and password input by the user in the authentication information input unit 91 are included in the AT command information, which is a line control command, as authentication information. The authentication information receiving means 53 of the unit 5 is notified. The authentication information included in the AT command information is stored in the authentication information storage unit 61.
Is stored. Thereafter, between the input unit 9 and the control unit 5, A
The connection is established according to the procedure of the T command.

In the mobile terminal device PS1 of the present invention, there is a mobile terminal device PS1 in which the control unit 5 and the input unit 9 are connected by a PPP procedure in a separation type terminal. FIG. 9 shows the above PPP
10 shows a configuration of a mobile terminal device for connecting control unit 5 and input unit 9 in a data link procedure according to the present invention, and FIG. 10 is a sequence diagram for explaining an operation in the configuration. Here, taking the mobile terminal device PS1 as an example, FIG.
The differences from the description will be described. That is, the control unit 5 includes a PPP processing control unit 54 as a control function, and the input unit 9 includes a PPP processing unit 92. The control unit 5 and the input unit 9 provide the PPP processing control unit 54 and the PP
It is connected via a P processing unit 92. The PPP processing control unit 54 and the PPP processing unit 92 are for executing connection processing between the control unit 5 and the input unit 9 according to the PPP procedure.

The operation of this configuration will be described.
First, prior to opening a connection between the mobile terminal device PS1 and the gateway GW, the control unit 5 and the input unit 9
Performs a connection according to a connection procedure based on an AT command. Then, the PPP processing unit 92 of the input unit 9 checks the LC of the PPP procedure.
In P, specify the authentication method by “Config-req”,
The control unit 5 is requested to perform authentication using a password held by the mobile terminal device PS1.

Thereafter, the control unit 5 sends the "Authen
When the user ID / password is sent by "ticate-req", the user ID / password is sent to the gateway GW as an authentication request signal.

Therefore, according to the above embodiment, mobile terminal apparatus PS1 monitors whether or not base station CS1 to be connected has been switched to another base station CS2, and manages the detection result in server apparatus AS. The gateway GW is informed, and the gateway GW determines from the detection result notified from the mobile terminal device PS1 requesting the connection,
The mobile terminal device PS1 can determine whether it is a new connection or a reconnection to the server device AS. Then, if the result of this determination is a new connection, authentication information including a user ID and password assigned in advance to the mobile terminal device PS1 for each of the base stations CS1 to CSn between the mobile terminal device PS1 and the gateway GW. The mobile terminal device PS1 and the gateway GW accumulate the authentication information in the authentication information storage unit 61 and the information storage unit 718, respectively, by performing the transmission and reception of the authentication information. In this case, the authentication processing is executed using the authentication information stored in the authentication information storage unit 61 and the information storage unit 718.

As a result, even in a system in which a different password is used for each connection, the above-described authentication processing is performed at the time of reconnection. And the server apparatus AS can be reconnected, so that the user does not need to perform a troublesome work of inputting a password each time.

Also, when the mobile terminal device PS1 is a separation type terminal, the same effect as described above can be obtained by using an authentication procedure based on an AT command or a PPP procedure.
Further, in each of the above embodiments, the case where data communication is performed between the mobile terminal device and the server device AS has been described as an example. However, a WWW server on the Internet or a server connected to a communication network may be used. When performing data communication, it is also possible to perform automatic authentication processing at the time of reconnection by switching base stations.

It should be noted that the present invention is not necessarily limited to the scope of each of the above-described embodiments, and it goes without saying that various modifications can be made without departing from the scope of the invention.

[0071]

As described in detail above, according to the present invention,
The mobile terminal device monitors whether the base station to be connected has been switched to another base station, and notifies the data communication device of the detection result. From the detection result notified from the device,
The mobile terminal device can determine whether it is a new connection or a reconnection to the data communication device. And
When the result of this determination is a new connection, the authentication process is performed by transmitting and receiving authentication information including individual key information between the mobile terminal device and the data communication device,
The mobile terminal device and the data communication device respectively store the authentication information in the authentication information storage means. If the determination result indicates reconnection, the authentication information stored in the authentication information storage means is used for the authentication. The processing is executed.

Therefore, for example, when reconnecting a mobile terminal device and a data communication device, a mobile data communication system and a mobile data communication system capable of reliably performing a reconnection process without requiring a user to perform a troublesome input operation. A mobile terminal device and a data communication device can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a mobile data communication system according to the present invention.

FIG. 2 is a circuit block diagram showing a configuration of a mobile terminal device of the system shown in FIG.

FIG. 3 is a circuit block diagram showing a configuration of a base station of the system shown in FIG. 1;

FIG. 4 is a circuit block diagram showing a configuration of a gateway of the system shown in FIG. 1;

FIG. 5 is a diagram showing a sequence when data communication is performed between the mobile terminal device and the server device.

FIG. 6 is a diagram showing a configuration of an authentication request signal and an authentication response signal.

FIG. 7 is a flowchart illustrating an authentication processing operation in the mobile terminal device during the sequence shown in FIG. 5;

8 is a diagram showing an example of a protocol sequence when performing an authentication processing operation when the mobile terminal device shown in FIG. 2 is a split-type terminal.

FIG. 9 is a circuit block diagram showing another example of the mobile terminal device of the present invention.

FIG. 10 is a diagram showing an example of a protocol sequence when performing an authentication processing operation in the mobile terminal device shown in FIG. 9;

FIG. 11 is a sequence diagram showing a conventional authentication procedure.

[Explanation of symbols]

 CS1 to CSn base station PS1 to PSm mobile terminal device IN1 ISDN IN2 I 'network PN dedicated line network AS server device GW gateway 1,10 radio unit 2,20 modem unit 3,30 TDMA Unit 4, 40 Talk unit 5, 50 Control unit 6, 60 Information storage unit 7, 70 Data communication unit 11, 111 Antenna 12, 112 High frequency switch (SW) 13, 113 Receiving unit 14, 114 ... Synthesizers 15,115 ... Transmission sections 16,116 ... Reception electric field strength detection sections (RSSI) 21,221 ... Demodulation sections 22,222 ... Modulation sections 31,331 ... TDMA decoding sections 32,332 ... TDMA encoding sections 41,441 ... ADPCM transcoder 42 PCM codec 43 Speaker 44 Microphone 442 Public line interface Source unit 443, 712 dedicated line interface unit 51 base station switching determination unit 52 authentication processing control unit 53 authentication information receiving unit 54 PPP processing control unit 61 authentication information storage unit 91 authentication information input unit 92 PPP processing unit 711 line interface unit 713 packet communication control unit 714 routing table unit 715 buffer unit 716 network interface unit 717 device control unit 718 information storage unit 717a connection processing unit 717b connection state determination unit 717c ... Authentication processing control means

Claims (5)

[Claims] At least one base station device constituting a wireless area, a mobile terminal device connected to the base station device via a wireless line, and a communication network including the base station device and a wired line. And a data communication device connected between the mobile terminal device and the data communication device, wherein the data communication between the mobile terminal device and the data communication device. During communication, it is detected whether or not switching of the base station device to be connected in the mobile terminal device has occurred, and based on the detection result, whether the connection between the data communication device and the mobile terminal device is a new connection Connection state determining means for determining whether the connection is a reconnection by switching the base station apparatus to be connected, and when the connection state determination means determines that the connection is a new connection, the mobile terminal apparatus and the data terminal Authentication processing means for setting up a connection with a communication device, notifying and / or acquiring authentication information, and performing authentication processing; and storing authentication information for storing authentication information used in the authentication processing means. Means for performing authentication processing between the mobile terminal apparatus and the data communication apparatus using the authentication information stored in the authentication information storage means when the connection state determination means determines that reconnection is to be performed. A mobile data communication system comprising: 2. A data communication system comprising: a data communication device connected to at least one base station device constituting a wireless area via a wireless line and connected to the base station device via a communication network including a wired line; In the mobile terminal device that performs communication, during data communication with the data communication device, detects whether switching of the connected base station device has occurred, and notifies the detection result to the data communication device. A connection state determining unit that determines whether the connection with the data communication device is a new connection or a reconnection by switching a base station device to be connected based on the detection result; If it is determined that the connection is a connection, an authentication process for setting up a connection with the data communication device, notifying and / or acquiring authentication information, and performing an authentication process is performed. Means, authentication information storage means for storing the authentication information used by the authentication processing means, and use of the authentication information stored in the authentication information storage means when the connection state determination means determines reconnection. And a reconnection authentication processing means for performing authentication processing with the data communication device. 3. The mobile device according to claim 2, wherein said authentication processing means performs authentication processing by notifying and / or acquiring authentication information input by a line control command at the time of a new connection. Terminal device. 4. The mobile terminal device according to claim 2, wherein said authentication processing means performs authentication processing by notifying and / or acquiring authentication information input by a data link authentication procedure. . 5. Connected to at least one base station device constituting a wireless area via a communication network including a wired line,
In a data communication device for performing data communication between the base station device and a mobile terminal device connected via a wireless line, a data communication device with the base station device connected to the mobile terminal device during data communication with the mobile terminal device Monitors whether a switch has occurred,
A connection state determination unit that determines whether the connection from the mobile terminal device is a new connection or a reconnection by switching a base station device to be connected, and the connection state determination unit determines that the connection is a new connection. Setting a connection with the mobile terminal device,
Authentication processing means for executing authentication processing by notifying and / or acquiring authentication information; authentication information storage means for storing authentication information used by the authentication processing control means; Reconnection authentication processing means for executing an authentication process between the mobile terminal device and the data communication device using the authentication information stored in the authentication information storage means, when the reconnection is determined by the means. A data communication device comprising: