JPH1023162A - Communication method in internetwork - Google Patents

Abstract

(57) [Summary] [PROBLEMS] When network terminal devices that are not always connected to the internetwork communicate via the internetwork, the called side promptly responds to a communication request from the calling side. To provide a communication method in an internetwork capable of responding. SOLUTION: A calling network terminal device calls a pager of a called network terminal device via a pager base station to notify an address assigned by connecting to a network relay device, and notifies the called device. The network terminal device, when notified of the address of the calling network terminal device by the pager, notifies the calling network terminal device of the assigned address by connecting to the network relay device. And

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network terminal device for temporarily connecting to a network relay device accommodated in an internetwork and receiving a temporary assignment of an address on the internetwork in the internetwork. Related to the communication method.

[0002]

2. Description of the Related Art A typical example of an internetwork constituted by interconnecting networks is a TCP / IP (Transmission Connec- tion).
control Protocol / Internet Pr
The Internet, which is a worldwide network based on (autocol) communication.

When exchanging IP packets between communication terminals accommodated in the Internet, each communication terminal uses an address of the other terminal on the Internet in order to identify the other terminal on the Internet. You need to know the IP address.

In a network terminal device which is always connected to the Internet via a dedicated line or the like,
The P address is fixedly assigned, and once the IP address of the network terminal device is known,
Since the IP address does not change, direct data communication with the network terminal device by exchanging IP packets is always possible.

[0005] On the other hand, as shown in FIG. 14, the network terminal devices 11 and 22 of the Internet connection provider (provider) housed in the Internet 1 are connected to the network terminal device 11 via a public line or ISDN as necessary. , 12 are connected and a temporary IP is
In the case of a connection form such as a so-called dial-up IP connection in which the IP address can be used until the connection is interrupted after receiving the address, the network terminal apparatuses 11 and 12 respectively Until the connection to the terminal 22 is established, the IP address assigned to the own device cannot be known.

Therefore, as shown in FIG.
Even if an attempt is made to perform direct communication via the Internet 1 between the network terminal apparatuses 11 and 12 that are not always connected to the Internet 1, one network terminal apparatus 11 performs data communication with the other network terminal apparatus 12. When the network terminal device 12 is connected to the network relay device 21 and assigned an IP address,
Network terminal device 12 does not necessarily connect to the network device. Even if the network terminal device 12 is connected and has been assigned an IP address, the network terminal device 12 determines that the network terminal device 11 wants to communicate with itself. Since the user does not know, the IP address of the network terminal device 12 is not notified to the network terminal device 11, and direct data communication cannot be performed between the network terminal devices 11 and 12.

Here, the network terminal devices 11 and 12
A problem in a case where direct data communication cannot be performed between the devices will be described by taking a case where data to be communicated is a facsimile message as an example.

When a facsimile message is transmitted and received from the network terminal device 11 to the network terminal device 12 via the Internet 1, the sender network terminal device 11 communicates with the recipient network terminal device 12. Thus, a direct connection cannot be made like a G3 facsimile apparatus via a public line.

Therefore, the network terminal device 11
Such a facsimile message addressed to a recipient who cannot be directly connected is temporarily stored in the network relay device 21 which is a connection point on the Internet 1, and the network relay device 21 transmits the stored facsimile message to the network relay device 22. The network relay device 22 accumulates the facsimile message from the network relay device 21 and then transmits it to the network terminal device 12 connected thereto.

Therefore, the network terminal device 11
Since the standard function (DIS) and the non-standard function (NSS) of the network terminal device 12 cannot be obtained when reading the facsimile message, the network terminal device 12
It is not possible to select the optimal scanning resolution or compression method that matches the maximum function of
Unnecessarily, a compression method with low compression efficiency had to be selected. Therefore, the facsimile data flowing through the Internet 1 tends to be redundant, and the communication load on the Internet 1 increases.

Further, since the facsimile message transmission procedure between the network terminal device 11 and the network relay device 21 and between the network relay device 22 and the network terminal device 12 is performed by half-duplex communication, The relay devices 21 and 22 are required to have real-time communication, which increases the processing load. Also, the network relay devices 21 and 22
Needs to perform facsimile message linear density conversion and compression type conversion processing, and the processing load for that is large.

Thus, the network terminal device 11,
A problem arises when direct data communication cannot be performed between the two.

Therefore, the network terminals 11, 12
In order to perform direct data communication between them, a communication method via a service center and a communication method using e-mail have been considered.

In the communication method via the service center,
In the network configuration shown in FIG. 15, communication is performed according to the procedure shown in FIG.

FIG. 15 shows a configuration in which a service center device 41 accommodated in the Internet 1 is added to the configuration shown in FIG. Network terminal device 1 shown in FIG.
1 and the procedure when direct data communication is performed between the network terminal device 12 and the network terminal device 12 will be briefly described with reference to FIG.

In FIG. 1, a network terminal device 11
When connected to the network relay device 21 (phase A1), the network relay device 21 sets an IP address for the network terminal device 11 (phase A2). Then, the network terminal device 11 connects to the service center device 41 and registers its own IP address in the list of the service center device 41 (phase A3).

On the other hand, the network terminal device 12 connects to the network relay device 22 (phase A4), and the network relay device 22 sets an IP address for the network terminal device 12 (phase A5). Then, the network terminal device 12 connects to the service center device 41 and registers its own IP address in the list of the service center device 41 (phase A6).

The service center device 41 that has registered the IP address of the network terminal device 12 in the list in phase A6 connects to the network terminal device 11 based on the IP address of the network terminal device 11 learned in phase A3, and 11 acquires the IP address of the network terminal device 12 from the list of the service center device 41 (phase A7).

The network terminal device 11 performs a phase A
7, a connection request is made to the network terminal device 12 based on the IP address of the network terminal device 12 learned at step 7, and the IP address of the own device is notified (phase A
8). The network terminal device 12 makes a direct data communication by responding to the connection to the network terminal device 11 based on the IP address of the network terminal device 11 learned in phase A8 (phase A1).
0).

However, in the case of such a communication method via the service center device 41, the network terminal device 11 can only communicate with a network terminal device (network terminal device 12) registered in the service center 41. . Also, when trying to communicate with a particular partner terminal, that partner terminal must connect to the service center device 41. For the network terminal device 12, the service center device 41
Until the network terminal device 11 is connected to the network terminal device 11, it cannot know that it is being called from the network terminal device 11.
The network terminal device 12 responds (Phase A9) from the point of connection to the network relay device 21 (Phase A1) for direct data communication with the network relay device 21 (Phase A10). ), A considerable time has passed, and there has been a problem that smooth communication cannot be performed.

On the other hand, in the communication method using electronic mail,
In the network configuration shown in FIG. 14, communication is performed according to the procedure shown in FIG.

The network terminal device 11 shown in FIG.
And a procedure for performing direct data communication with the network 12 will be briefly described with reference to FIG.

Referring to FIG.
Is connected to the network relay device 21 (Phase B
1), the network relay device 21 sets an IP address for the network terminal device 11 (phase B)
2). Then, the network terminal device 11 sends the network terminal device 12
The network relay device 22 transmits the e-mail addressed to it (phase B3), and accumulates the e-mail until a request from the network terminal device 12 is received. The e-mail contains the IP address of the network terminal device 11 as the content.

On the other hand, when the network terminal device 12 connects to the network relay device 22 (phase B4),
The network relay device 22 is a network terminal device 1
2 is set to the IP address (phase B5).
Then, the network terminal device 12 continues to request the network relay device 22 for an electronic mail addressed to itself (phases B6 to B8). Then, the e-mail is received from the network terminal device 11, and the IP address of the network terminal device 11 included in the e-mail is obtained (phase B9).

The network terminal device 12 performs the phase B
By notifying the network terminal device 11 of its own IP address based on the IP address of the network terminal device 11 learned in Step 9 (Phase B10), direct data communication becomes possible (Phase B11).

However, even in the case of such a communication method using electronic mail, the network terminal device 12 calls itself from the network terminal device 11 until receiving the electronic mail from the network relay device 22. From the time when the network terminal device 11 tries to perform direct data communication with the network terminal device 12 and connects to the network relay device 21 (phase A1).
The network terminal device 12 notifies the IP address (Phase B10), and a considerable time has elapsed until the communication is started (Phase B11), and there has been a problem that smooth communication cannot be performed.

[0027]

As described above,
In a conventional communication method in an internetwork, when network terminal devices that are not always connected to the internetwork communicate through the internetwork, a communication request from a calling network terminal device is received. There has been a problem that the calling network terminal device cannot respond quickly.

The present invention has been made in view of the above circumstances, and when network terminal devices that are not always connected to the internetwork communicate with each other via the internetwork, the network terminal device on the calling side can communicate with the network terminal device. It is an object of the present invention to provide a communication method in an internetwork in which a called-side network terminal device can respond quickly to the communication request described above.

[0029]

According to a first aspect of the present invention, there is provided a communication method in an internetwork, comprising: temporarily connecting to a network relay device accommodated in the internetwork; In the communication method in the internetwork between network terminal devices that are temporarily assigned to each other, the calling network terminal device is connected to a network relay device and assigned an address, and then the assigned address is paged. The pager of the called network terminal device is called and notified via the base station, and the called network terminal device, when notified of the address of the calling network terminal device by the pager, performs the network relay. Connect to the device and assign an address. After receiving the hit, by notifying the calling network terminal device that is identified by its assigned the notified address to address,
The calling and called network terminal devices exchange addresses with each other to establish communication, and perform direct communication via the internetwork.

According to a second aspect of the present invention, there is provided the communication method in the internetwork, wherein the network terminal devices are temporarily connected to a network relay device accommodated in the internetwork and receive a temporary assignment of an address on the internetwork. In a communication method in an internetwork, a calling network terminal device, after connecting to a network relay device and receiving an address, sends the network relay device together with a pager number of a called network terminal device to the network relay device. Notifying the pager call request, the network relay device having received the request assigns the address assigned to the calling network terminal device to the called network terminal device side of the notified number via the pager base station. Call the pager When the pager is notified of the address of the calling network terminal device, the called network terminal device connects to the network relay device and receives the address, and then receives the address. By notifying an address to a calling network terminal device specified by the notified address, the calling and called network terminal devices exchange addresses with each other to establish communication, and It is characterized by performing direct communication via the.

According to a third aspect of the present invention, there is provided the communication method in the internetwork, wherein the network terminal devices are temporarily connected to a network relay device accommodated in the internetwork and receive a temporary assignment of an address on the internetwork. In a communication method in an internetwork, a calling network terminal device connects to a network relay device, receives an address, and then sends a call to the network relay device accommodated in the internetwork to the called network terminal device. The page relay number is notified by e-mail together with the pager number of the pager, and the network relay device that has received the request transmits the address assigned to the calling network terminal device extracted from the contents of the e-mail to the pager Base Calling and notifying the pager of the called network terminal device of the notified number via the station, and the called network terminal device is notified of the address of the calling network terminal device by the pager; After connecting to the network relay device and receiving an address, by notifying the assigned address to the calling network terminal device specified by the notified address, the calling side and The called network terminal apparatuses exchange addresses with each other to establish communication, and perform direct communication via the internetwork.

[0032]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

First, FIG. 1 shows a network configuration to which a communication method in an internetwork according to a first embodiment of the present invention is applied. In FIG. 1, network relay devices 21 and 22, each of which is a host on the provider side, are accommodated in the Internet 1. The network terminal device 11 is connected to the network relay device 21 via a public line via a so-called dial-up IP connection, temporarily receives an IP address, and communicates as a host on the Internet 1 with a large number of networks. This is a representative representation of one of the terminal devices.

Similarly, the network terminal device 12 is connected to the network relay device 21 via a public line by a dial-up IP connection, temporarily receives an IP address, and communicates as a host on the Internet 1. 1 is a representative representation of one of a number of network terminal devices to perform. The pager base station 31 provides a paging service and a message transmission service to a pager of a general subscriber, and also includes a pager 32 included in the network terminal device 12 as a subscriber and is a service target.

FIG. 2 is a block diagram showing a common configuration of the network relay device and the network terminal device according to the present embodiment. Referring to FIG.
It is a microcomputer that controls each part of the device. RO
M102 stores a program describing various control procedures of the CPU 101 and various data. RAM1
03 is a work area of the CPU 101. The modem unit 104 modulates transmission data and demodulates received data. NCUs 106 and 107
It performs line connection control with the public line. DTMF
The generator 105 generates a DTMF signal. The DTMF detection device 108 detects a DTMF signal.

The operation display unit 111 is provided with various keys for accepting input from the user, and a display for displaying the operation state of the apparatus and various messages to be notified to the user. .

High frequency receiving section 110 and pager control section 1
09 comprises a pager base station 3
It conforms to the specifications of the pager to be serviced, and has a function of responding to a call from the pager base station 31 and a function of receiving a message.

The scanner 122 reads original image information. The plotter 123 records and outputs image information. The image information CODEC 121 encodes and compresses image information, and decodes and expands encoded image information. The scanner 122, the printer 123, and the image information CODEC 121 constitute an image information processing unit 124.

The microphone 134 is for inputting an audio signal, and the A / D converter 132 is for converting an analog audio signal from the microphone 134 into a digital audio signal. The D / A converter 133 is for converting a digital audio signal into an analog audio signal, and the speaker 135 is for outputting the analog audio signal from the D / A converter 133 audibly. Voice CODE
C131 encodes and compresses the digital audio signal and decodes and expands the encoded digital audio signal. These A / D converter 132, microphone 134, D / A
Converter 133, speaker 135, and audio CODE
C131 constitutes the audio information processing unit 136. The system bus 140 is a unit in which the above-described units exchange data.

FIG. 3 shows the software configuration of the program stored in the ROM 102, classified according to the layer of each protocol.

As the network relay device, in addition to the respective components shown in FIG. 2, a router required as a host accommodated in the Internet 1 and a large number of network terminal devices connected by dial-up IP. Many modem devices, communication servers,
It has an e-mail server, etc.
The description is omitted because it is not directly related to the present invention.

Next, the network terminal device 1 shown in FIG.
The procedure when 1 or 12 connects to the Internet 1 via the network relay device 21 or 22, respectively, will be described. In the following description, only the network terminal device 11 and the network relay device 21 will be described, but the same applies to the network terminal device 12 and the network relay device 22.

In order for the network terminal device 11 to connect to the Internet 1, a network relay device 21 normally operated by an Internet connection provider (provider) is required.
And connect by relaying there. In general, when the network terminal device 11 connects to the network relay device 21,
U106 will be used to connect via a public line. However, the connection method with the network relay device 21 is not limited to the public line, and there is a connection method via a CATV network using a so-called cable modem.

When the network terminal device 11 connects to the network relay device 21, the network terminal device 11 connects to the network relay device 21 from a public line. Network relay device 2 that receives an incoming call
1 executes a log-in process, the network terminal device 11 first logs in to the network relay device 21, and thereafter, a PPP (Point to Point P) is executed.
network terminal device 11 using the
And the network of the network relay device 21 are connected transparently.

The PPP frame has a configuration as shown in FIG. 4, and the information portion includes a packet frame used in TCP / IP or the like. Its TCP / I
The P frame has a protocol header for each protocol layer, and its data portion includes a higher-order protocol frame. By doing so, processing can be performed for each protocol layer.

The network relay device 21 transfers the contained packet portion to another protocol (for example, Ethernet or the like) as it is so as to transparently transfer the packet to the LAN environment on the network relay device 21, The Internet 1 is configured by transferring the data to another network.

The IP datagram format has a configuration as shown in FIG. IP packets on the Internet 1 are delivered based on the destination IP address in the IP header, and packets for confirmation are returned based on the source IP address in the IP header.

Further, UDP (User Datagra)
m Protocol) has a configuration as shown in FIG. 6, and UDP transfers application data that does not require ordering in the application data to be transported (TCP requests ordering order). Corresponding to.)

As described above, the network terminal device 11
It is connected to the Internet 1 via the network relay device 21.

Next, the network terminal apparatus 11 receives a DHCP (D), which is a general protocol necessary for receiving an IP address from the network relay apparatus 21.
dynamic Host Configuration
Protocol) will be described with reference to FIG. In the following description, the DHCP client is the network terminal device 11, and the DHCP server is
The network relay device 21. Each packet is sent by UDP.

First, the DHCP client first sends the DHCP
Broadcast a DISCOVER message.
If information other than the IP address is required for this message, a request item is added to the same DHCPDISCOVER message.

The DHCP server that has received the DHCPDISCOVER message determines the requested information from this message. When there is a request for an IP address, an address to be assigned is provisionally determined. Then, the provisionally determined IP address is stored in the DHCPOFFER message, and similarly broadcast.

The DHCP client collects DHCPOFFER sent from the DHCP server for a certain period. The IP address (and other information) to be used is determined from the received DHCPOFFER message. Then, it broadcasts a DHCPREQUEST message. This message contains a server identifier (se) indicating the server from which the information was used.
reverse identifier) and the I to use
P address (and other information) is included.

The DHCP server that has received the DHCPREQUEST message checks the server identifier and the like of the message, and the information provided to the DHCP client in the DHCPOFFER message is D.
It is checked whether or not the selection has been made on the HCP client side.
Then, the following processing is performed.

That is, when the DHCP client selects the provided information, the provisionally determined IP address is set to a determined state so that it cannot be used for a request from another DHCP client. This prevents the same IP address from being assigned to a plurality of clients. Then, D is sent to the DHCP client.
Send back the HC CP ACK message by unicast.

When the provided information is not selected by the DHCP client, the provisional determination of the IP address assignment is stopped. As a result, when a request is received from another DHCP client, the provisionally determined IP address can be used.

D which received the DHCPACK message
The HCP client completes the system initialization by setting an IP address and the like in the network interface. Note that the DHCP client is
To release the address assignment, use DHCPREL
Send EASE to DHCP server.

Under the DHCP control, the network terminal device 11 connects to the Internet 1 by receiving its own IP address from the network relay device 21. The same applies to the case where the network terminal device 12 connects to the Internet 1 via the network relay device 22.

Next, the procedure of the communication method according to the first embodiment of the present invention performed in the network configuration shown in FIG. 1 will be described with reference to FIG.

In the figure, the network terminal device 11
However, when connected to the network relay device 21 via the modem unit 104 and the NCU 106 (phase C1), the network relay device 21 sets an IP address for the network terminal device 11 (phase C2). Then, the network terminal device 11 generates a DTMF signal corresponding to the pager number of the network relay device 12 known in advance by the DTMF generation device 105, and transmits the DTMF signal to the public line via the NCU 107, whereby the pager Make a call to base station 31 and call pager base station 3
1 corresponding to the decimal notation of the IP address assigned to the own device in a predetermined format according to the standard of 1.
A TMF signal is generated by the DTMF generator 105 and is notified as a message to the pager base station 31 via the NCU 107 (phase C3).

The pager base station 31 calls the pager 32 of the network terminal device 12 and notifies the IP address of the network terminal device 11 notified as a message from the network terminal device 11 as a message (phase C4). The IP address of the network terminal device 11 as the message is received by the high-frequency receiving unit 110 of the pager 32 of the network terminal device 12, and is input to the main body of the network terminal device 12 via the pager control unit 109 (phase C5).

When the pager 32 is called,
Network terminal device 1 requesting communication with its own device
The network terminal device 12 that has detected the presence of the network terminal device 12 connects to the network relay device 22 (phase C6), and the network relay device 22 sets an IP address for the network terminal device 12 (phase C7). In addition,
It is also conceivable that the user of the network terminal device 12 that has learned that the pager 32 has been called by operating the call buzzer operates the operation display unit 111 to connect the network terminal device 12 to the network relay device 22.

Then, the network terminal device 12 sends a message to the network terminal device 11 specified by the IP address received as a message from the pager 32.
The IP address of the own device allocated from the network relay device 22 is notified (phase C8). In addition, the user of the network terminal device 12 who has seen the IP address of the network terminal device 11 displayed on the message display unit of the pager 32 operates the operation display unit 111 to give the network terminal device 11 Notification of the IP address is also conceivable.

As a result, the network terminal devices 11 and 12 can exchange their IP addresses with each other, the communication is established, and the communication starts (phase C9). Therefore,
Normally, even when the network terminal device 11 and the network terminal device 12 not connected to the Internet 1 perform communication via the Internet 1, the communication request from the network terminal device 11 on the calling side is not received. The calling network terminal device 12 can respond quickly.

Next, a second embodiment of the present invention will be described. FIG. 9 shows a network configuration to which the communication method according to the second embodiment is applied. The difference from the network configuration according to the first embodiment shown in FIG.
1 is that the network relay device 21 is not the network terminal device 11 itself.

The procedure of the communication method according to the second embodiment of the present invention performed in the network configuration shown in FIG. 9 will be described with reference to FIG.

In the figure, the network terminal device 11
Is connected to the network relay device 21 via the modem unit 104 and the NCU 106 (phase D1), the network relay device 21 sets an IP address for the network terminal device 11 (phase D2). Then, the network terminal device 11 sends a UDP packet of a pager call request in which the number of the pager 32 of the network terminal device 12 is set in the data field to the network relay device 21.
A request is made to call the pager 32 of the network terminal device 12 (phase D3). Of course, the network terminal device 12 may set the IP packet assigned to itself to the UDP packet of the pager call request.

The network relay device 21 acquires the pager number of the network terminal device 12 and the IP address IP of the network terminal device 11 from the UDP packet received from the network terminal device 11. The network relay device 21 is a network terminal device 11
From the destination IP address field of the IP packet. The number of the pager 32 of the network terminal device 12 is obtained from the UDP data field. However, if the IP address of the network terminal device 11 is also set in the UDP data field, the IP address may be obtained therefrom.

The network relay device 21 transmits the DTMF signal corresponding to the pager number of the network terminal device 12 thus obtained to the DTMF generation device 105.
And sends the call to the public line via the NCU 107 to make a call to the pager base station 31 and to output the IP address assigned to the network terminal device 11 in a predetermined format according to the standard of the pager base station 31. DTMF signal corresponding to decimal notation
It is generated by the F generator 105 and notified to the pager base station 31 as a message via the NCU 107 (phase D4).

The pager base station 31 calls the pager 32 of the network terminal device 12 and notifies the IP address of the network terminal device 11 notified as a message from the network relay device 21 as a message (phase D5). The IP address of the network terminal device 11 as the message is received by the high-frequency receiving unit 110 of the pager 32 of the network terminal device 12, and is input to the network terminal device 12 via the pager control unit 109 (phase D6).

When the pager 32 is called,
Network terminal device 1 requesting communication with its own device
The network terminal device 12 that has noticed the presence of the network terminal device 12 connects to the network relay device 22 (phase D7), and the network relay device 22 sets an IP address for the network terminal device 12 (phase D8). In addition,
It is also conceivable that the user of the network terminal device 12 that has learned that the pager 32 has been called by operating the call buzzer operates the operation display unit 111 to connect the network terminal device 12 to the network relay device 22.

Then, the network terminal device 12 transmits the message to the network terminal device 11 specified by the IP address received as a message from the pager 32.
The IP address of the own device allocated from the network relay device 22 is notified (phase D9). In addition, the user of the network terminal device 12 who has seen the IP address of the network terminal device 11 displayed on the message display unit of the pager 32 operates the operation display unit 111 to give the network terminal device 11 Notification of the IP address is also conceivable.

As a result, the network terminal devices 11 and 12 can exchange IP addresses with each other, communication is established, and communication is started (phase D10). Therefore, even when the network terminal device 11 and the network terminal device 12 that are not connected to the Internet 1 communicate with each other via the Internet 1, the communication request from the network terminal device 11 on the calling side is always
The called network terminal device 12 can respond quickly. Further, since the network relay device 21 calls the pager 32, it is not necessary for the network terminal devices 11, which are generally accommodated per network relay device, to have a line for calling the pager 32.

Next, a third embodiment of the present invention will be described. FIG. 11 shows a network configuration to which the communication method according to the third embodiment is applied. The difference from the network configuration according to the first embodiment shown in FIG. The point is that it is not the network terminal device 11 itself but the network relay device 23 accommodated in the Internet 1. The network relay device 23 has the same configuration as the network relay devices 21 and 22.

The procedure of the communication method according to the third embodiment of the present invention performed in the network configuration shown in FIG. 11 will be described with reference to FIG.

In the figure, the network terminal device 11
Is connected to the network relay device 21 via the modem unit 104 and the NCU 106 (phase E1), the network relay device 21 sets an IP address for the network terminal device 11 (phase E2). Then, the network terminal device 11 sends an e-mail requesting a pager 32 of the network terminal device 12 to be called,
This is sent to the network relay device 23 (phase E3).

Here, an example of an electronic mail exchanged on the Internet 1 will be described below. Email example: ---------------------------------------------- ----
--------------------- Received: from dsp2.tttt.rrrrr.co.jp (dsp2.ttt
t.rrrrr.co.jp [133.139.21.15]) by cosmos.cs.rrr
rr.co.jp (8.6.11 + 2.4W / 3.3W9-1.0M8sun) withESMTP
id VAA20468 for <taro@cs.rrrrr.co.jp>; Thu, 14
Mar 1996 21:16:07 +0900 Received: from tttt.rrrrr.co.jp (main.tttt.rrrr
r.co.jp [133.139.26.1]) by dap2.tttt.rrrrr.co.j
p (8.6.11 + 2.4W / 3.3W9-1.0M8sun) with SMTPid VAA
10795; Thu, 14 Mar 1996 21:19:19 +0900 Received: by tttt.rrrrr.co.jp (1.37.109.4/6.4J.
6-90sep08) id AA01856; Thu, 14 Mar 96 21:15:49 +09
00 Received: from cosmos by tttt.rrrrr.co.jp (1.3
7.109.4 / 6.4J.6-90sep08) id AA01850; Thu, 14 Mar 96
21:15:47 +0900 Received: from (venus.cs.rrrrr.co.jp [133.139.1
64.43]) by cosmos.cs.rrrrr.co.jp (8.6.11 + 2.4W /
3.3W9-1.0M8sun) with SMTP id VAA20463 forhanak
o@main.tttt.rrrrr.co.jp; Thu, 14 Mar 1996 21: 15: 5
6 +0900 Date: Thu, 14 Mar 1996 21:15:56 +0900 Message-Id: <199603141215.VAA20463@cosmos.cs.rrrr
r.co.jp> From: Taro Suzuki <taro@cs.rrrrr.co.jp> To: hanako@main.tttt.rrrrr.co.jp Subject: xxxxxx (omitted below) --------- -----------------------------------------
-------------------- Email example up to here:

The network terminal device 11 sends an appropriate field in the e-mail of the call request of the pager 32 of the network terminal device 12 to be sent to the network relay device 23, for example, for writing the title of the e-mail.
The number of the pager 32 of the network terminal device 12 is set in the item of Subject: and the like.

The network relay device 23 appears in the e-mail received from the network terminal device 11,
The IP address of the network terminal device 11 can be obtained from the last one of the Received: fields. However, I of the network terminal device 11
The P address is also stored in the pager 3 of the network terminal device 12.
Like the number 2, the information may be set in an appropriate field in the e-mail.

The network relay device 23 causes the DTMF generator 105 to generate a DTMF signal corresponding to the pager number of the network relay device 12 obtained from the electronic mail from the network terminal device 11 in this manner. By making a call to the public line via the NCU 107, a call is made to the pager base station 31, and the IP address assigned to the network terminal device 11 in a predetermined format according to the standard of the pager base station 31 is supported in decimal notation. DTMF signal is generated by the DTMF generator 105, and is transmitted through the NCU 107.
The pager base station 31 is notified as a message (phase E4).

The pager base station 31 calls the pager 32 of the network terminal device 12, and notifies the IP address of the network terminal device 11 notified as a message from the network relay device 23 as a message (phase E5). The IP address of the network terminal device 11 as the message is received by the high-frequency receiving unit 110 of the pager 32 of the network terminal device 12, and is input to the network terminal device 12 via the pager control unit 109 (phase E6).

When the pager 32 is called,
Network terminal device 1 requesting communication with its own device
The network terminal device 12 that has detected the presence of the network terminal device 12 connects to the network relay device 22 (phase E7), and the network relay device 22 sets an IP address for the network terminal device 12 (phase E8). In addition,
It is also conceivable that the user of the network terminal device 12 that has learned that the pager 32 has been called by operating the call buzzer operates the operation display unit 111 to connect the network terminal device 12 to the network relay device 22.

Then, the network terminal device 12 transmits the message to the network terminal device 11 specified by the IP address received as a message from the pager 32.
The IP address of the own device allocated from the network relay device 22 is notified (phase E9). In addition, the user of the network terminal device 12 who has seen the IP address of the network terminal device 11 displayed on the message display unit of the pager 32 operates the operation display unit 111 to give the network terminal device 11 Notification of the IP address is also conceivable.

As a result, the network terminals 11 and 12 can exchange IP addresses with each other, communication is established, and communication is started (phase E10). Therefore, even when the network terminal device 11 and the network terminal device 12 that are not connected to the Internet 1 communicate with each other via the Internet 1, the communication request from the network terminal device 11 on the calling side is always
The called network terminal device 12 can respond quickly. In addition, the calling-side network terminal device 11
Since the notification of the address and the pager number to the network relay device 23 accommodated in the Internet 1 and the call request to the pager are performed by e-mail, the notification and the request can be easily performed. Even if the IP address of the calling network terminal device 11 is changed on the way by a router or the like in the Internet 1, the true IP address of the calling network terminal device 11 is included in the e-mail. Therefore, even if the called-side network terminal device 12 is far away from the calling-side network terminal device 11, the IP address of the calling-side network terminal device 11 can be changed. The network terminal device 12 can be correctly notified.

As described above, according to the first to third embodiments, the network terminal device 11 on the calling side and the network terminal device 12 on the called side exchange IP addresses with each other, thereby directly After the communication is established, TCP / TCP of the software configuration shown in FIG.
By the FAX protocol located at a higher layer than IP,
Facsimile communication using the image information processing unit 124 and capable of exchanging model information becomes possible.

FIG. 13 shows a facsimile communication procedure performed in a layer higher than TCP / IP in communication established between the calling-side network terminal device 11 and the called-side network terminal device 12. , Which are used in G3 facsimile in public lines.

In the figure, when the calling side (TX) calls the called side (RX), it first sends out CNG and waits for the CED to come from the called side (RX). The called party (RX)
When an incoming call is received, CED is first sent out, and then (76 ± 20m
s delay) NSS, DIS,
Send CSI.

The calling side (TX) transmits N times from the called side (RX).
When receiving the SS, DIS, and CSI, it sends out a set of NSF or DCS and TSI according to the contents, and sets communication conditions. Then, from the set communication conditions, T
Send CF and check modem speed. When the called party (RX) receives the TCF normally, it sends out the CFR.

As described above, the calling side (TX) determines the communication conditions, sends out the image information, and sends out the RTC at the end of the image information. After sending the RTC (after a delay of 75 ± 20 ms),
The EOP is transmitted, and it is declared that there is no next page (if there is a next page, the MPS is performed). Called party (RX)
However, if the received page is output normally, the MCF is returned. From the above, the calling side (TX) sends out DCN and the line is disconnected.

In this embodiment, the calling side (TX)
Network terminal device 11 as a caller and a called side (RX)
After exchanging the IP address with the network terminal device 12 as a network device, the network terminal device 12
When S and CSI are transmitted, the network terminal 11
Sends out a set of NSF or DCS and TSI from the received NSS, DIS, and CSI, and then the network terminal device 11 appropriately sets reading conditions and transfers the read condition to the network terminal device 12, but the TCP / TCP I
Since the communication is at a higher layer than P, there is no need to exchange TCF / CFR for modem training.

Thus, the network terminal device 11 and the network terminal device 12 can transmit a facsimile image under appropriate reading conditions, and in addition to the Internet 1, the network relay device 21, and the network relay device 22, No unnecessary communication load is applied.

[0092]

According to the first aspect of the present invention, when a calling side and a called side network terminal device which are not always connected to the internetwork want to communicate via the internetwork, the calling and called side network terminal devices need to make a call. The address assigned to the calling network terminal device is immediately notified to the called network terminal device by the pager, and the called network terminal device immediately responds and issues the address assigned to itself. Since the notification is made to the calling network terminal device, the called network terminal device can quickly respond to the communication request from the calling network terminal device.

According to the second aspect of the present invention, when a calling side and a called side network terminal device which are not always connected to the internetwork want to communicate via the internetwork, the calling side is called. The address assigned to the network terminal device is immediately notified to the called network terminal device by the pager via the network relay device.
Immediately responds and changes the address assigned to
Since the notification is made to the calling network terminal device, the called network terminal device can quickly respond to the communication request from the calling network terminal device. Further, since the pager is called by the network relay device, it is not necessary for the network terminal devices generally accommodated in one network relay device to have a line for calling the pager, respectively. The communication method according to the present invention can be realized at low cost as compared to

According to the third aspect of the present invention, when a calling terminal and a called network terminal device that are not always connected to the internetwork want to communicate via the internetwork, the calling side is called. The address assigned to the network terminal device is immediately notified to the called network terminal device by the pager via the network relay device accommodated in the internetwork, and the called network terminal device also responds immediately. In order to notify the calling network terminal device of the address assigned to the own device, the network terminal devices communicate with each other via the internetwork. Thus, the called network terminal device can respond quickly. Further, since the pager is called by the network relay device accommodated in the internetwork, generally, a large number of network terminal devices accommodated in one network relay device do not need to have a line for calling the pager. As compared with the first aspect, the communication method according to the present invention can be realized at low cost. Further, since the calling network terminal device notifies the network relay device accommodated in the internetwork of the address and the pager number and makes a call request to the pager by e-mail,
These notifications and requests can be easily made, and even if the address of the calling network terminal device is changed on the way by a router or the like in the internetwork, the true address of the calling network terminal device cannot be changed by e-mail. There is no inconvenience because it is included in the address, and even if the called network terminal device is located far away from the calling network terminal device, such as overseas, the address of the calling network terminal device is received. It is possible to correctly notify the calling network terminal device.

[Brief description of the drawings]

FIG. 1 is a diagram showing a network configuration to which a communication method according to a first embodiment of the present invention is applied.

FIG. 2 is a block diagram showing a common configuration of a network terminal device and a network relay device according to the embodiment of the present invention.

FIG. 3 is a diagram showing a software configuration provided in the network terminal device and the network relay device according to the embodiment of the present invention.

FIG. 4 is a diagram showing a PPP frame and a TCP / IP frame configuration included as information in the PPP frame.

FIG. 5 is a diagram showing an IP datagram format.

FIG. 6 is a diagram showing a format of a UDP header field.

FIG. 7 is a diagram illustrating acquisition and release of an IP address in DHCP.

FIG. 8 is a diagram showing a procedure of a communication method according to the first embodiment of the present invention.

FIG. 9 is a diagram illustrating a network configuration to which a communication method according to a second embodiment of the present invention is applied.

FIG. 10 is a diagram showing a procedure of a communication method according to a second embodiment of the present invention.

FIG. 11 is a diagram illustrating a network configuration to which a communication method according to a third embodiment of the present invention is applied.

FIG. 12 is a diagram showing a procedure of a communication method according to a third embodiment of the present invention.

FIG. 13 is a diagram showing a facsimile communication procedure.

FIG. 14 is a diagram showing a network configuration to which a conventional communication method is applied.

FIG. 15 is another diagram showing a network configuration to which a conventional communication method is applied.

FIG. 16 is a diagram showing a procedure of a conventional communication method.

FIG. 17 is another diagram showing a procedure of a conventional communication method.

[Explanation of symbols]

 1 Internet 11, 12 Network Terminal Device 21, 22, 23 Network Relay Device 31 Pager Base Station 32 Pager 41 Service Center Device 101 CPU 102 ROM 103 RAM 104 Modem Unit 105 DTMF Generator 106, 107 NCU 108 DTMF Detector 109 Pager Control Unit 110 High-frequency receiving unit 111 Operation display unit 121 Image information CODEC 122 Scanner 123 Plotter 124 Image information processing unit 131 Audio CODEC 132 A / D converter 133 D / A converter 134 Microphone 135 Speaker 136 Audio information processing unit 140 System bus

Claims (3)

[Claims] 1. A communication method in the internetwork between network terminal devices that are temporarily connected to a network relay device accommodated in an internetwork and receive a temporary assignment of an address on the internetwork, comprising: After being connected to the network relay device and receiving an address, the network terminal device calls the pager on the called network terminal device side via the pager base station and notifies the allocated address, and If the pager notifies the address of the calling network terminal device by the pager, the side network terminal device is connected to the network relay device, receives the address assignment, and is notified of the assigned address. The calling party identified by the address By notifying the network terminal device, the calling and called network terminal devices exchange addresses with each other to establish communication, and perform direct communication via the internetwork. Communication method in internetwork. 2. A communication method in the internetwork between network terminal devices that are temporarily connected to a network relay device accommodated in an internetwork and receive a temporary assignment of an address on the internetwork, wherein the calling side After being connected to the network relay device and receiving an address, the network terminal device notifies the network relay device of a pager call request of the pager together with the pager number of the called network terminal device. The network relay device that has received the caller-side network terminal device by calling the pager of the notified number through the pager base station to notify the address assigned to the calling-side network terminal device,
When the called network terminal device is notified of the address of the calling network terminal device by the pager, the called network terminal device is connected to the network relay device, receives the address, and then changes the allocated address. By notifying the calling-side network terminal device specified by the notified address, the calling-side and called-side network terminal devices exchange addresses with each other to establish communication, and communicate via the internetwork. A communication method in an internetwork, wherein direct communication is performed. 3. A communication method in the internetwork between network terminal devices which are temporarily connected to a network relay device accommodated in an internetwork and receive a temporary assignment of an address on the internetwork, wherein the calling side After connecting to the network relay device and receiving an address, the network terminal device requests the network relay device accommodated in the internetwork to call the pager together with the pager number of the called network terminal device. Is notified by e-mail, and the network relay device receiving the request sends the address assigned to the calling-side network terminal device extracted from the content of the e-mail to the notified number via the pager base station. Called network end of The pager on the device side is called and notified, and the called network terminal device is connected to the network relay device and receives an address when the pager is notified of the address of the calling network terminal device. After that, by notifying the assigned address to the calling network terminal device specified by the notified address, the calling and called network terminal devices exchange addresses to communicate with each other. To establish
A communication method in an internetwork, comprising performing direct communication via the internetwork.