JPH11252656A - Mobile data communication system, base station device and mobile terminal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a base station device to use parameter information and to execute a data link connection protocol by notifying the parameter information that is needed for data link creation between the base station device and a data communication device from a mobile terminal device to the base station device. SOLUTION: A PPP information communication controlling means 552 sends and receives parameter information that is necessary for PPP link creation. Also, a TCP/IP execution controlling means 553 controls the creation and release of TCP connection with a server and data transfer between a mobile terminal and the server respectively according to a TCP/IP protocol executing program stored in a TCP/IP protocol storing part 662. And, a TCP/IP information communication controlling means 554 sends and receives control information needed for data communication by a TCP/IP to/from the mobile terminal at the time of carrying out a TCP/IP protocol.

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 that enables data communication between a mobile terminal device and a server device connected to a communication network using a (Personal Handy-phone System), and a base station device and a mobile terminal 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.

[0004] The data communication service using the mobile communication system is very convenient because the user can send and receive e-mail and access a homepage on the Internet anytime and anywhere.

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 and a server.
After establishing a data link by TCP / IP (Tr
ansmission Control Protocol / Internet Protocol)
Data communication is performed according to.

However, this type of conventional system has a function of executing the PPP protocol and the TCP / IP protocol in the mobile terminal device, and when performing data communication, the mobile terminal device executes the PPP protocol to communicate with the server. A data link is set up between them, and then data communication is performed according to the TCP / IP protocol. At this time, the base station performs a process of converting the asynchronous PPP on the wireless line into the synchronous PPP.

Here, when a data link is established by PPP, negotiations necessary for data communication, such as terminal authentication by a server and assignment of an IP address, are performed. Further, after the data link is established by the PPP, a TCP connection is established, and the TCP connection is disconnected after the data communication is completed. During the data communication, complicated operations such as retransmission and flow control for improving communication reliability are performed. Processing is performed.

[0008] Accordingly, making the mobile terminal execute PPP and TCP / IP, which require such complicated processing, not only reduces the memory capacity of the mobile terminal but also increases the memory capacity of the mobile terminal.
The need for a processor with high processing capability has been a major obstacle to reducing the size and weight of the mobile terminal device and reducing the price.

[0009]

As described above, in the conventional system, since the execution of PPP and TCP / IP is performed by the mobile terminal device, the load on the configuration and processing of the mobile terminal device increases. This has a problem that it becomes a major obstacle in reducing the size, weight, and cost of the mobile terminal device.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances. It is an object of the present invention to reduce the load on the configuration and processing of a mobile terminal device, and to further reduce the size and weight of the mobile terminal device. An object of the present invention is to provide a mobile data communication system that can be reduced in cost, and a base station device and a mobile terminal device thereof.

[0011]

In order to achieve the above object, the present invention provides at least one base station device constituting a wireless area, and a mobile terminal device connected to the base station device via a wireless line. And a data communication device connected to the base station device via a communication network, and a data link is set between the mobile terminal device and the data communication device to perform data communication. In the above, the base station device is provided with a protocol storage means storing a program for executing a data link connection protocol, when performing data communication between the mobile terminal device and the data communication device, the protocol storage means The base station device establishes a data link on a communication network with a data communication device according to the program stored in Prior to tank opening control, in which to perform the notification or acquisition or both of parameter information necessary for opening the data link via the radio link with the mobile terminal apparatus and the base station apparatus.

Therefore, according to the present invention, parameter information necessary for establishing a data link between the base station apparatus and the data communication apparatus is notified from the mobile terminal apparatus to the base station apparatus, and the base station apparatus The data link connection protocol can be executed using the notified parameter information. That is, it is possible to provide the base station device with a function of executing a data link connection protocol such as the PPP protocol.

For this reason, the mobile terminal device does not need a large-capacity memory for storing the data link connection protocol, and the processing capability of the processor can be reduced because it is not necessary to execute the data link connection protocol. Therefore, it is possible to reduce the size and weight of the mobile terminal device and, consequently, reduce the price.

Further, according to the present invention, when the parameter information is transferred, the encryption key information is transferred from the base station apparatus to the mobile terminal apparatus, and the mobile terminal apparatus encrypts the parameter information using the encryption key information, and encrypts the parameter information. It is also characterized in that it is sent to a device. By doing so, the parameter information is encrypted and transferred in plain text, not in plain text. For example, the security of the password of the mobile terminal user can be enhanced.

On the other hand, another 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, and a communication network for the base station device. And a data communication device connected via a data communication device, wherein a data link is established between the mobile terminal device and the data communication device to perform data communication. And a protocol storage means storing a program for executing a communication protocol of a network layer,
Before and during data communication, transmission and reception of control information necessary for data transfer on the transport layer and the network layer between the base station apparatus and the mobile terminal apparatus via the data link, In the station device, the program stored in the protocol storage means,
Data communication between the mobile terminal device and the data terminal device is controlled in accordance with control information exchanged with the mobile terminal device.

Therefore, according to the present invention, control information necessary for data transfer on the transport layer and the network layer is exchanged between the mobile terminal apparatus and the base station apparatus before and during data communication, and The station device can perform data transfer based on the result of the transfer of the control information and the data transfer protocol stored in the local device. That is, it is possible to provide the base station device with a function of executing a data transfer protocol such as the TCP / IP protocol.

For this reason, in the mobile terminal device, TCP / IP
A large-capacity memory for storing a data transfer protocol such as a protocol is not required, and the processing capability of the processor can be reduced by eliminating the need to execute the data transfer protocol. Therefore, also here, the mobile terminal device can be reduced in size and weight, and can be reduced in price. Furthermore, T
Since the redundant information of the CP / IP header can be reduced, the throughput is improved.

[0018]

Embodiments of the present invention will be described below 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, and each form a radio area called a cell.

The mobile terminals PS1 to PSm are connected to the nearest base station via a radio line in a 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 public network INW via a wired line. The public network INW is an integrated services digital network (ISDN),
The ISDN has an I 'interface network for accommodating each of the base stations CS1 to CSn. Public network INW
In addition to many subscriber wired terminals,
A network or a company network is connected. For example, in the case of the Internet, an access server AS of an Internet service provider is connected to the ISDN, and connected to the Internet ITN via the access server AS. The Internet ITN has many WWW (World-Wide Web) servers WS1, WS2,
Are connected to each other and the mobile terminal device PS is used as well as the subscriber wired terminal by using the TCP / IP protocol.
Access is also possible from 1 to PSm.

A content server TS owned by an Internet service provider is connected to the access server AS. This content server TS
Are the subscriber wired terminals and the mobile terminal devices PS1 to PSm
Has the function of downloading various information in response to the request of

Further, the mobile data communication system of this embodiment includes a management control device MS. The management control device MS has, for example, a function as a mail server in addition to a system management function of performing authentication and accounting processing for each of the mobile terminal devices PS1 to PSm, and each of the base stations CS1 to CSn via the public network INW. Connected to.

By the way, the mobile terminal devices PS1 to PS
m is configured as follows. FIG. 2 is a circuit block diagram showing the configuration. The mobile terminal devices PS1 to PSm include a radio unit 1 having an antenna 11, a modem unit 2, a TDM
A section 3, communication section 4, control section 5, information storage section 6,
And a data communication unit 7.

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 section 13 is input to the demodulating section 21 of the modem section 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 Diffe
rential 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, the information data is stored in the information storage unit 6 and supplied to a liquid crystal display (LCD) 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 then 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.

[0030] The TDMA encoding unit 32 uses the ADP.
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 the local oscillation signal generated from the synthesizer 14, upconverts the 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 PPP information communication control unit 51 and a TCP / IP information Communication control means 5
2 is provided.

The PPP information communication control means 51 includes:
A base station CS1 to CSn, which will be described later, communicates with the server via PPP.
When a link is established, parameter information required for establishment is transmitted and received between the base stations CS1 to CSn.
As the parameter information, for example, there is a password for authentication. This password is read from the memory in the control unit 5 in response to an authentication request from the server and transmitted to the base station. At this time, for example, the authentication request shown in FIG.
As shown in (2), when information for specifying the encryption key and the encryption method is included, the password is encrypted according to the encryption information and then transmitted.

The TCP / IP information communication control means 52
Prior to data communication by CP / IP, control information required for this communication is transmitted and received between the base stations CS1 to CSn. The TCP / IP control information includes, for example, type information of a communication protocol such as TCP / UDP, a destination address, a destination port number, and a connection identifier as shown in FIG. An input unit 9 accommodates a dial key, a transmission key, various function keys, a handwriting input unit, and the like.

Next, the base stations CS1 to CSn are configured as follows. FIG. 3 is a circuit block diagram showing the configuration. The base stations CS1 to CSn include a radio unit 10 having an antenna 111, a modem unit 20, a TDMA unit 30, an interface unit 40, a control unit 50, and 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 (Ad
An aptive Differential Pulse Code Modulation) transcoder 441 and a line interface 442 are provided. The ADPCM transcoder 441 uses the T
The audio data output from the DMA decoding unit 331 is decoded. The line interface 442 performs call connection processing and data communication with the public network INW according to instructions from the control unit 50. The digital audio signal decoded by the ADPCM transcoder 441 is transmitted from the line interface 442 to the public network INW.

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 PPP connection control or data transfer control based on TCP / IP based on this 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 the data to the public network I via the line interface 442.
Transfer to NW.

On the other hand, digital communication signals of a plurality of channels arriving from the public network INW are transmitted to the line interface 44.
2 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, the data communication unit 7
Input to 0.

The data communication unit 70 determines that the destinations of the input control data and information data are the mobile terminal devices PS1 to PS.
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 TDMA encoding unit 332 performs the above
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.
PPP execution control means 551 and PPP information communication control means 5
52, TCP / IP execution control means 553,
And an IP information communication control unit 554.

When the mobile terminal devices PS1 to PSm perform data communication with the server, the PPP execution control means 551 executes the PPP protocol execution program stored in the PPP protocol storage unit 661 of the information storage unit 60. , The control for establishing or disconnecting the PPP link between the own station and the server is executed.

The PPP information communication control means 552 uses the P
When establishing the PP link, the mobile terminal devices PS1 to PSm
The exchange of parameter information necessary for establishing a PPP link is performed between the server and the server. As described above, the parameter information to be transmitted and received includes the password information of the mobile terminal device.

The TCP / IP execution control means 553 opens and releases a TCP connection with the server in accordance with a TCP / IP protocol execution program stored in the TCP / IP protocol storage section 662 of the information storage section 60. , Respectively, to control data transfer between the mobile terminal devices PS1 to PSm and the server.

The TCP / IP information communication control means 554
When executing the above TCP / IP protocol, TCP / I
Control information required for data communication by P is transmitted and received between the mobile terminal devices PS1 to PSm.

Next, the establishment of a PPP link by the system configured as described above and the data communication operation by TCP / IP will be described. Here, the mobile terminal device P
S1 is a content server TS in the cell of base station CS1.
A case in which data communication is performed between the server and the server will be described as an example.
FIG. 6 is a sequence diagram showing the procedure.

When the mobile terminal device PS1 makes a call to the server, a call connection is first made between the base station CS1 and the mobile terminal device PS1, and between the base station CS1 and the server TS. When the call connection is completed, the base station CS1 sets the information storage unit 6
In accordance with the program for executing the PPP protocol stored in 0, a process for establishing a PPP link with the server TS is started. Prior to this, parameters required for establishing a PPP link with the mobile terminal device PS1 are started. Negotiate information. FIG. 7 is a sequence diagram showing the procedure.

That is, the server TS transmits the LC of the PPP procedure.
In P, the authentication method is designated by “config-req”, and authentication by the ID password held by the mobile terminal device PS1 is requested. For example, CHAP is specified as the authentication method. CHAP is an authentication method specified in RFC 1994, in which the mobile terminal device encrypts its own password using the encryption key sent by the server TS and sends it to the server.
In this method, the server encrypts the password of the corresponding mobile terminal device stored in the server in the same manner, and verifies the encrypted password to perform authentication.

When the encryption key is sent from the server TS by the authentication packet (challenge), the base station CS1
It creates P information and sends it to the mobile terminal device PS1. The PPP information transmitted at this time is, for example, as shown in FIG.
As shown in the figure, the type (authentication) of the PPP information and the server TS
And an encryption key sent from the company.
When the mobile terminal device PS1 receives the PPP information,
The own password is encrypted using the encryption key and the encryption method designated by this information, and the encrypted password is transmitted to the base station CS together with the user ID as shown in FIG.
Send to 1. The base station CS1 communicates with the mobile terminal PS
Then, the encrypted password and the user ID notified from 1 are transferred to the server TS as “response”.

When the encrypted password arrives, the server TS reads the encrypted password from its own memory and checks it against the password of the corresponding mobile terminal device which has been similarly encrypted. Then, when they match, the result is notified to the base station CS1. The server TS is a base station C
A procedure for designating an IP address with S1 is performed by the IPCP procedure shown in FIG. When the base station CS1 obtains the authentication from the server TS and receives the designation of the IP address, the PPP information indicating that the link establishment is permitted (FIG. 4)
(C)) to the mobile terminal device PS1. Thus,
A PPP link is established between the base station CS1 and the server TS.

When the PPP link is established, the base station CS1 executes a process for establishing a TCP connection with the server TS. FIG. 8 is a sequence diagram showing the procedure.

That is, the mobile terminal device PS1 first
Control information required for data communication by CP / IP, that is, type information indicating a link establishment request, and TCP / UDP
And the destination address and the destination port number are notified to the base station CS1. FIG. 5A shows an example of the data format. Here, a case where the TCP protocol is specified as the communication protocol of the transport layer is shown.

The base station CS1 transmits the T
When notified of the CP / IP control information, a process for establishing a TCP connection with the communication destination corresponding to the destination port number, that is, the server TS, is executed. This process is based on RFC
791 and RFC793. Server TS
When a TCP connection is established between
1 is the TC of the mobile terminal device PS1 as shown in FIG.
TCP / I indicating completion of P connection establishment
Transmit P control information. FIG. 5C shows an example of the data format, which is composed of a control information type (connection open OK) and a connection identifier.

When the TCP connection is established, the mobile terminal device PS1 thereafter transmits data by designating the identifier notified by the control information. FIG. 5 (b)
Shows an example of the data format, and is composed of a control information type (data), the identifier, and data.

On the other hand, the base station CS1 determines the connection from the identifier included in the TCP / IP control information received from the mobile terminal device S1, and transmits the received data to T
The packet is converted into a TCP packet having a format according to the CP / IP protocol and then transmitted to the server TC. Further, the TCP packet arriving from the server TC is converted into a format of TCP / IP control information shown in FIG.
The message is transmitted to the mobile terminal device PS1. That is, the received T
An identifier corresponding to the connection of the CP packet is added to the received data together with the control information type, and this is transmitted to the mobile terminal device PS1. The mobile terminal device PS1 has the above-mentioned T
When receiving the CP / IP control information, the control information type and the identifier are deleted from the received information, and only the received data is stored in the information storage unit 6 and displayed on the LCD 8.

When the data communication is completed, the TCP connection is released. That is, the mobile terminal device PS1
Sends a connection release request specifying the identifier of the TCP connection to be released to the base station CS according to the TCP control information.
Notify 1. When the base station CS1 receives the release notification of the TCP connection, the base station CS1 transmits the TCP corresponding to the identifier to the server TS according to the TCP / IP protocol.
Release the connection.

As described above, in this embodiment, the base station C
The S1 and the mobile terminal device exchange parameter information such as a password and an IP address necessary for establishing a PPP link, and form a PPP link between the base station CS1 and the server TS based on the result. After the establishment of the PPP link, the mobile terminal device PS1 sends a T to the base station CS1.
Control information required for data communication by CP / IP, that is, type information indicating a link establishment request, and TCP / UDP
And the like, a destination address and a destination port number, and a connection corresponding to the notified identifier are established between the base station CS1 and the server TS. Base station C
S1 and the mobile terminal device PS1 transmit and receive TCP / IP control information in which the above-mentioned identifier is added to the data, and the base station CS1 and the server TS perform format conversion based on the control information to convert the data. I try to transmit.

Therefore, according to this embodiment, both the execution function of the PPP protocol and the execution function of the TCP / IP protocol can be provided not in the mobile terminal device PS1 but in the base station CS1. Therefore, the mobile terminal device PS1
Now, the PPP protocol execution program and TCP / I
A large-capacity memory for storing the P execution program is not required, and the processing capability of the processor of the control unit 5 can be reduced because the need to execute the PPP protocol and the TCP / IP protocol is eliminated. For this reason, the size and weight of the mobile terminal device can be reduced, and the cost can be reduced.

In this embodiment, the mobile terminal device PS1
In the authentication procedure, the mobile terminal device PS
1, the mobile terminal device PS1 encrypts and transmits its own password based on the encryption key and the encryption method. For this reason, the security of the password on the wireless line can be enhanced.

The present invention is not limited to the above embodiment. For example, in the above embodiment, the password is encrypted in the mobile terminal device S1 in the authentication procedure. However, the password is notified from the mobile terminal device PS1 to the base station CS1, and the password is encrypted in the base station CS1. You may. In this case, security on the wireless line is reduced, but security on the wired line can be ensured.

In the above-described embodiment, the case has been described as an example where the server TS assigns an IP address to the mobile terminal device PS1, but the mobile terminal device PS1 may notify the server of the IP address owned by the mobile terminal device PS1. . That is, in a normal PPP connection, the server assigns an IP address to the mobile terminal device, but the mobile terminal device may wish to perform data communication with the server using the IP address that is used on a daily basis. In this case, before the PPP link establishment procedure is performed between the base station CS1 and the server TS, the mobile terminal notifies the base station CS1 of its own IP address from the mobile terminal PS1. Then, the base station CS1 performs negotiation for establishing a PPP link with the server TS using the terminal-specified IP address.

Further, in the above embodiment, the case where the TCP protocol is selected has been described, but the UDP protocol or the ICMP protocol may be selected. Also in this case, the mobile terminal device notifies the base station of the identifier for identifying the connection together with the destination address and the destination port number as control information. Thereafter, the base station and the mobile terminal device distinguish the connection based on the identifier.

Further, the following can be considered as parameter information necessary for establishing a data link.
That is, the information notified from the mobile terminal device to the base station includes the maximum number of received bytes, presence or absence of data compression, a request for an IP address, designation of a line quality monitoring protocol, and the like.
Also, as information notified from the base station to the mobile terminal device,
There are responses to each of the above designations. In short, if it is optional information that can be negotiated in the PPP procedure,
Any information can be applied.

Further, in the above-described embodiment, the case where data communication is performed between the mobile terminal device and the content server TS of the service provider has been described as an example. However, the mobile terminal device is connected to a WWW server on the Internet or a public network. Data communication may be performed with an information supply server managed by a local government, a company, or the media. Further, the management control device MS of the system is provided with, for example, a mail server function or a local information server function. In this case, data communication may be performed between the mobile terminal device and the management control device.

In addition, the configuration of the mobile terminal device and the base station device, the transmission / reception procedure of parameter information necessary for establishing a data link, the type of control information required for data communication and its transmission / reception procedure, the type of data link connection protocol (PPP In addition, SLIP can be applied) and the like can be variously modified without departing from the gist of the present invention.

[0070]

As described above in detail, according to the present invention, the base station device is provided with protocol storage means for storing a program for executing the data link connection protocol, and the protocol between the mobile terminal device and the data communication device is provided. When performing data communication, the base station device establishes a data link on a communication network with the data communication device according to a program for executing a data link connection protocol stored in the protocol storage means, and establishes the data link. Prior to the control, notification and / or acquisition of parameter information necessary for establishing a data link is performed between the base station apparatus and the mobile terminal apparatus via the wireless line.

According to another aspect of the present invention, the base station apparatus is provided with protocol storage means for storing a program for executing a communication protocol of the transport layer and the network layer, so that the base station apparatus can perform the communication before and during the data communication. The base station transmits and receives control information necessary for data transfer on the transport layer and the network layer via a data link between the device and the mobile terminal device. Data communication between the mobile terminal device and the data terminal device is controlled according to a program for executing the protocol and control information exchanged between the mobile terminal device and the mobile terminal device.

Therefore, according to these inventions, the load on the configuration and processing of the mobile terminal device can be reduced, and thereby the mobile data communication which can further reduce the size, weight and cost of the mobile terminal device can be achieved. A system, a base station device and a mobile terminal device thereof 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.

FIG. 4 is a diagram showing a configuration of PPP information.

FIG. 5 is a diagram showing a configuration of TCP / IP information.

FIG. 6 is a view showing a protocol sequence when data communication is performed between the mobile terminal device and the server.

FIG. 7 is a view showing a PPP link opening sequence in the sequence shown in FIG. 6;

FIG. 8 is a view showing a TCP link establishment / data transfer sequence in the sequence shown in FIG. 6;

[Explanation of symbols]

CS1 to CSn: Base stations PS1 to PSm: Mobile terminal devices INW: Public network MS: Management control device ITN: Internet WS1, WS2, WS3: WWW server AS: Access server of Internet service provider TS: Content server 1,10 ... Radio unit 2,20 ... Modem unit 3,30 ... TDMA unit 4,40 ... Talker unit 5,50 ... Control unit 6,60 ... Information storage unit 7,70 ... Data communication unit 11,111 ... Antenna 12,112 ... High-frequency switches (SW) 13, 113 receiving units 14, 114 synthesizers 15, 115 transmitting units 16, 116 receiving electric field strength detecting units (RSSI) 21, 221 demodulating units 22, 222 modulation units 31, 331 TDMA decoding units 32, 332... TDMA encoding units 41, 441. Coder 42 ... PCM codec 43 ... speaker 44 ... microphone 442 ... line interface unit 51 ... PPP information communication control means 52 ... TCP / IP information communication means 551 ... PPP execution control means 552 ... PPP information communication control means 553 ... TCP / IP execution Control unit 554: TCP / IP information communication control unit 661: PPP protocol storage unit 662: TCP / IP protocol storage unit

Claims (7)

[Claims] At least one base station device constituting a wireless area, a mobile terminal device connected to the base station device via a radio line, and a mobile terminal device connected to the base station device via a communication network. A data communication device comprising: a data communication device that establishes a data link between the mobile terminal device and the data communication device to perform data communication, wherein the base station device executes a data link connection protocol. And a protocol storage unit storing a program for performing data communication between the mobile terminal device and the data communication device in accordance with the program stored in the protocol storage unit. A data link opening means for opening a data link on a communication network with the device, and a data link by the data link opening means. Prior to opening control, parameter information communication means for notifying and / or acquiring parameter information necessary for establishing a data link between the base station apparatus and the mobile terminal apparatus via the wireless line. A mobile data communication system characterized by the above-mentioned. 2. The parameter information communication means transfers encryption key information from a base station device to a mobile terminal device, and the mobile terminal device encrypts parameter information using the encryption key information and sends the encrypted parameter information to the base station device. The mobile data communication system according to claim 1, further comprising a function. 3. A function of being connected to a mobile terminal device via a wireless line and connected to a data communication device via a communication network and relaying data communication between the mobile terminal device and the data communication device. In the base station device of the mobile data communication system, a protocol storage unit storing a program for executing a data link connection protocol, and when performing data communication between the mobile terminal device and the data communication device, Data link establishment control means for performing control for establishing a data link between the communication apparatus and the data communication apparatus in accordance with the program stored in the protocol storage means; and data link establishment by the data link establishment control means Prior to the control, parameters required for establishing a data link with the mobile terminal device via the wireless line. A base station apparatus for a mobile data communication system, comprising: parameter information communication control means for notifying and / or acquiring data information. 4. At least one base station device constituting a wireless area, a mobile terminal device connected to the base station device via a radio line, and a mobile terminal device connected to the base station device via a communication network. A protocol storage unit storing a program for executing a data link connection protocol in the base station apparatus, and performing data communication between the mobile terminal apparatus and the data communication apparatus. Data link opening means for opening a data link on a communication network between the base station apparatus and the data communication apparatus in accordance with the program stored in the protocol storage means. In the mobile terminal device, the data link with the base station device via the wireless line is performed prior to the data link establishment control. Receiving parameter information necessary for opening or notification or mobile terminal device comprising the parameter information communication control means for performing both. 5. At least one base station device constituting a wireless area, a mobile terminal device connected to the base station device via a radio line, and a mobile terminal device connected to the base station device via a communication network. In a mobile data communication system, comprising a data communication device for setting up a data link between the mobile terminal device and the data communication device to perform data communication, the base station device includes a transport layer and a network layer. Protocol storage means for storing a program for executing a communication protocol, wherein before the start of data communication and during the data communication period, the transport layer between the base station apparatus and the mobile terminal apparatus via the data link; Control information communication means for transmitting and receiving control information necessary for data transfer on a network layer; and Data communication means for controlling data communication between the mobile terminal apparatus and the data terminal apparatus according to the program and the control information transmitted and received by the control information communication means. Data communication system. 6. A function for controlling data communication between the mobile terminal device and the data communication device which is connected to the mobile terminal device via a wireless line and connected to the data communication device via a communication network. A base station device of a mobile data communication system, comprising: a protocol storage unit storing a program for executing a communication protocol of a transport layer and a network layer; and a data link between the mobile terminal device and the data communication device. In a state where is set, before and during data communication, control for transmitting and receiving control information necessary for data communication of the transport layer and the network layer with the mobile terminal device via the data link. Information communication control means, the program stored in the protocol storage means, and the control information communication means A base station apparatus for a mobile data communication system, comprising: data communication control means for controlling data communication between the mobile terminal apparatus and the data terminal apparatus according to control information notified from the mobile terminal apparatus. . 7. At least one base station device constituting a wireless area, a mobile terminal device connected to the base station device via a radio line, and a mobile terminal device connected to the base station device via a communication network. Data communication device, the base station device, a protocol storage means storing a program for executing a communication protocol of the transport layer and the network layer, according to the program stored in the protocol storage means, In the mobile terminal device used in a mobile data communication system including data communication control means for controlling data communication between the mobile terminal device and the data terminal device, a data link is provided between the mobile terminal device and the data communication device. In the set state, before data communication and during the data communication period, through the data link with the base station apparatus. Control information communication control means for transmitting and receiving control information necessary for data communication of the transport layer and the network layer, and controlling data communication by the data communication control means of the base station apparatus based on the control information. Mobile terminal device of a mobile data communication system.