JPH08139822A - Data communication method and transmission coding apparatus using ISDN call control - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a data communication method and a transmission encoding device capable of efficiently transmitting and receiving data between a center device and a terminal device. When transmitting / receiving the call control information of the D channel of ISDN, a predetermined data signal is set in a call setting message of the call control information of the originating side devices 1 and 3, and is sent out. It is characterized in that the data signal set in the call setup message is taken out and used as internal information or external output of the receiving side device.

Description

Detailed Description of the Invention

[0001]

The present invention relates to ISDN (Integral)
rated Services Digital Ne
The present invention relates to data transmission / reception in a network), and more particularly to a data communication method and a transmission encoding device using call control information of a circuit switching procedure.

[0002]

2. Description of the Related Art A conventional data communication system will be described with reference to the drawings. FIG. 10 is an explanatory diagram showing an example of a conventional technique of this type of data communication method. In the figure, 1 is a terminal device used by each subscriber, 2 is a transmission control device on the side of the terminal device 1, 3 is a center device as a main device, and 4 is a transmission control device on the side of the center device 3.

In the conventional example shown in FIG. 10, the transmission control device 2
The transmission control device 4 and the transmission control device 4 are connected by a data dedicated line indicated by a dotted line in the figure, and this is an example of transmitting and receiving data through the data dedicated line. Hereinafter, this method will be referred to as a "dedicated line method".

Further, as an example of a data communication system using ISDN, there is a system in which each terminal is constantly polled and called from a center device and necessary data is transmitted / received after line connection. Hereinafter, this method is referred to as a "polling method".

[0005]

However, the conventional techniques have the following problems. First, the dedicated line system requires a dedicated line as many as the number of terminal devices, so that there is a problem in that it is difficult to improve economical efficiency and cost efficiency.

In the polling method, it is necessary to repeat polling until necessary data arrives from each terminal, and it is difficult to speed up and improve efficiency, such as access to a terminal device that does not have transmission data and line connection. In addition, there were problems such as increased line usage fees.

The main technical objects to be solved by the present invention are as follows. A first object of the present invention is to provide a data communication method and a transmission encoding device using ISDN call control capable of efficiently transmitting and receiving data between a center device and a terminal device. .

A second object of the present invention is to provide a data communication method and a transmission coding apparatus using ISDN call control capable of transmitting / receiving necessary data only by transmitting / receiving call control information generated through ISDN. It is something to do.

A third object of the present invention is to utilize ISDN call control, which facilitates the provision of various services using a network such as toll-free telephone (registered trademark of Nippon Telegraph and Telephone Corporation). A data communication method and a transmission encoding device are provided.

Other objects of the present invention will be apparent from the description, the drawings, and particularly the claims.

[0011]

The above-mentioned problems can be solved by adopting the novel characteristic construction method and means listed below by the present invention. That is, the first of the method of the present invention
Is characterized in that when transmitting and receiving D channel call control information between devices connected to the ISDN, a predetermined data signal is set in a call setting message of the call control information of the calling side device and sent out, and the called side device It is a data communication method using ISDN call control in which the data signal set in the call setup message is taken out and used as internal information of the receiving side device.

The second feature of the method of the present invention is that in the first feature of the method of the present invention, the place where the data signal is set is the call control of the ISDN which is the called number of each information element of the call setup message. Is a data communication method using.

The third feature of the method of the present invention is that the place for setting the data signal in the second feature of the method of the present invention is
This is a data communication method using call control of ISDN, which is a called sub-address among called numbers and called sub-addresses.

The fourth feature of the method of the present invention is the call control of ISDN, in which in the first feature of the method of the present invention, the place where the data signal is set is the calling number of each information element of the call setup message. Is a data communication method using.

The fifth feature of the method of the present invention is that the place for setting the data signal in the fourth feature of the method of the present invention is
This is a data communication method using call control of ISDN, which is a calling sub address, among calling numbers classified into a calling number and a calling sub address.

A sixth feature of the method of the present invention is that the layer used in the first, second, third, fourth or fifth feature of the method of the present invention is a network layer.
Is a data communication method using the call control.

The first feature of the device of the present invention is that, in a transmission encoding device for connecting an ISDN network to a main device or a terminal device, a system control part for controlling the operation of each part in the device and the main device or the terminal device. An encoding circuit that encodes input data such as image and sound so as to be suitable for communication using ISDN, and decodes data sent via ISDN, and data is input from the main device or terminal device. When it is detected that the call control information is generated for communication via ISDN, and the call control information sent via ISDN is output to the main device or the terminal device, The call control information generated by the data communication control unit is taken out, a predetermined data signal is set in the call setting message of the call control information, and the call setting message is sent.
And, if the transmitted call control information includes the prescribed data signal by judging whether or not the transmitted call control information includes the prescribed data signal, A call control information control unit that extracts and decodes a predetermined data signal, a transmission control unit that controls transmission of call control information, data sent from the encoding circuit, and a data sent from the transmission control unit. Incoming call control information I
A transmission coding apparatus using call control of ISDN, comprising: a connection device with an ISDN that transmits data to SDN and receives call control information and data sent via ISDN.

A second feature of the device of the present invention is that the call control information control unit in the first feature of the device of the present invention sets a predetermined information in the call setting message of the call control information to be transmitted, A storage unit for storing information, a coding unit for coding the call control information to be transmitted, and decoding a call setting message of the call control information transmitted via ISDN, and a coding unit for transmitting the call control information. A transmission coding apparatus utilizing call control of ISDN, comprising: an identification unit that identifies and extracts a predetermined data signal from a call setup message.

[0019]

Since the present invention employs the above method and means, information can be transmitted and received only by transmitting call control information, that is, without completing the connection of the line for transmitting and receiving data such as image and voice. Is possible.

[0020]

【Example】

(System Example) A system embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram illustrating the configuration of this system example. In the figure, 5 is a transmission encoding device on the terminal device 1 side, 6 is a transmission encoding device on the center device 3 side, and α is ISDN.

In the system example shown in FIG. 1, transmission coding devices 5, 6 are provided between a plurality of terminal devices 1 and one center device 6.
Also, although an example of transmitting / receiving data via the data communication network α is also applicable to data transmission / reception between the terminal devices 1 used by subscribers as long as the data communication network α is used.

(Example of Apparatus Configuration) An example of an apparatus suitable for configuring the system of the present invention will be described with reference to the drawings. FIG. 2 is a block diagram showing a connection configuration of the transmission coding devices 5 and 6, and FIG. 3 is a block diagram showing a more detailed configuration of the transmission coding device 6.

In the figure, 7 is an encoding circuit (CODECK),
8 is a data communication control unit, 9 is a setting unit 9a, a storage unit 9b,
A call control information control unit including an identification unit 9c and a coding unit 9d, 10 is a terminal adapter (TA), 11 is a transmission control unit, 12 is a remote control interface (IF), 1
3a and 13b are data communication control interfaces (I
F) and 14 are I / Os interposed between the encoding circuit (CODECK) 7 and the center device 3, and 15 is a system control unit,
Reference numeral 16 is an operation unit, and 17 is a display unit.

Although only the transmission encoding device 6 is shown in FIG. 3, as shown in FIG. 2, the transmission encoding device 5 on the terminal device 1 side and the transmission encoding device 6 on the center device 3 side are substantially the same. Shows the structure of.

The system control unit 15 includes a transmission encoding device 6
Control the overall behavior. The operation unit 16 is a unit for performing necessary operations such as inputting a calling number, and the display unit 17 is a unit for displaying a result of the operation by the operation unit 16.

The coding circuit (CODECK) 7 is a circuit for coding or decoding data when transmitting and receiving data, and is connected to the external center device 3 via the I / O 14. In addition, the data communication control unit 8 and the terminal adapter (TA) via the data communication control IF 13a.
10 is also connected.

The call control information control unit 9 includes a setting unit 9a for setting data to a subaddress of the call control information in the layer 3 (network layer) of the D channel, a storage unit 9b for storing information to be transmitted, and received call control information. It includes an identification unit 9c for identifying a sub address, a coding unit 9d for converting the transmission information type into a code, and decoding the received information.

The terminal adapter (TA) 10 is ISDNα.
The call control information is transmitted / received to / from. Transmission control unit 11
Sends the call control information received from the call control information control unit 9 to the ISDN α through the remote control IF 12 and the terminal adapter (TA) 10.

(Example of Method) An example of the method of the present invention will be described with reference to the drawings. 4 is an explanatory view showing a preferred example of the format of the call control information for carrying out the method example, FIG. 5 is an explanatory view showing the information element of the sub address in the call control information format shown in FIG. 4, and FIG. [Fig. 3] is an explanatory diagram for specifically explaining an example in which information is set in a sub address.

FIG. 7 is an operation flow showing the operation of the entire system of the present invention, and FIGS. 8 and 9 are operation flows when the code transmission devices 5 and 6 actually transmit or receive data. In FIG. 7, “network” is described as ISDN in FIG.
It is α.

As shown in FIG. 4, there are a common part and an individual part as information elements of the call control information of layer 3, which is usually called "network layer" in the D channel. When sending data using the information element that indicates the calling party number, divide the calling party number into a "calling party number" and a "calling subaddress", and set and use information in the "calling subaddress" To do.

As for the calling sub address, as shown in FIG. 5, first, the calling sub address information element identifier is set in the first octet. The second octet next shows the content length of the originating subaddress, and the third octet shows the type of the subaddress.

After the fourth octet, information is set in the sub-address indicating the information content. As a specific example thereof, an example as shown in FIG. 6 can be given. That is, general information contents are set in the sub addresses 00h to 09h, and specific contents are set in the sub addresses 0Ah and thereafter.

The operation of the system will be described with reference to FIG. First, the operation unit 16 of the transmission encoding device 6 on the side of the center device 3 is operated so that the setting unit 9a of the call control information control unit 9 sets data to the subaddress of the call control information of the layer 3 of the D channel [step I, II]. Less than,
The information in which the subaddress of this call control information is set is called "subaddress information".

Next, the sub-address information of the call control information of the call control information control unit 9 is sent to the transmission control unit 11 [step III].

Then, the transmission control unit 11 sets a link to the network α via the remote control IF 12 and the terminal adapter (TA) 10, and after the setting confirmation is completed, a call request is issued and a call is made. After calling, the sub-address information is sent to the network α via the remote control IF 12 and the terminal adapter (TA) 10 [step IV].

After the call request is made from the transmission encoding device 6 on the center device 3 side, the network α sets up a call toward the terminal device 1 side [step V].

In response to the call setting, the transmission encoding device 5 on the side of the terminal device 1 makes an incoming call, and the subaddress information transmitted to the network α is transferred to the terminal adapter (TA) 10 of the transmission encoding device 5. , Remote control interface (IF) 1
It is received by the transmission control unit 11 via 2 [step VI].

The sub-address information received by the transmission control section 11 is identified by the identification section 9c of the call control information control section 9 and stored in the storage section 9b [Step VI.
I].

After being stored in the storage unit 9b, the transmission control unit 11 sends a communication end command to the terminal adapter (TA) 10 via the remote control interface (IF) 12. Terminal adapter that received the command (T
A) 10 requests the network α to disconnect. The network α that has received the disconnection request notifies the transmission encoding device 6 on the side of the center device 3 of the disconnection. The transmission encoding device 6 that has received the notification disconnects and releases the line. And the terminal device 1
The transmission coding device 5 on the side also disconnects and releases the line [step IIX].

After that, the transmission coding device 5 on the terminal device 1 side
Then, the sub-address information received through the network α is processed by the data communication control unit 8 and used by the terminal device 1 [step IX].

Next, referring to FIG. 8, the transmission coding device 5,
An operation flow when transmitting data No. 6 will be described. First, the transmission information is input from the terminal device 1 or the center device 3 to the data communication control unit 8 via the data communication control interface (IF) [step I].

Next, the information is input to the call control information control unit 9 through the bus, and the transmission information is stored in the storage unit 9b [step II].

Next, the encoding unit 9d converts the transmission information type into a subaddress code [step III].

Next, the sub-address information converted into the sub-address code is sent to the transmission controller 11 [step IV].

Next, the remote control interface (I
F) The sub-address information is sent to the terminal adapter (TA) 10 via the [Step V].

Then, the system controller 15 determines whether or not a sub address is set in the terminal adapter (TA) 10 [step VI].

If a sub address is set in the terminal adapter (TA) 10, the terminal adapter (TA)
10 subaddresses are transmitted [step VII-a].

When the sub address is not set in the terminal adapter (TA) 10, the sub address of the transmission control unit 11 is sent [step VII-b]. Through the above operation, the sub-address information is sent to ISDNα.

Next, referring to FIG. 9, the transmission coding device 5,
The operation flow when receiving data No. 6 will be described.

First, the subaddress information received on the D channel of ISDNα is stored [step I].

Next, the subaddress information is extracted by the identification section 9b of the call control information control section 9, and is decoded by the coding section 9d to be converted into information [step II].

Then, the converted information is output to the data communication control unit 8 [step III]. Through the above-described operation, the information is used by the terminal device 1 or the center device 3 or as an external output displayed on the display unit 17, or used as internal information used by the system control unit 15.

(Application example) In the information format example as shown in FIG. 6, the communication method according to the present invention can be applied to a security system. In terms known in the art, an application example for realizing the toll-free [registered trademark of Nippon Telegraph and Telephone Corporation] function will be described.

First, description will be given assuming that a call is originated from the terminal device 1 side. On the transmitting side, the "calling address" of the call control information is arbitrarily changed by the coded transmission device 5 on the terminal device 1 side. Then, the call control information is transmitted as "toll number + calling sub-address (+ toll-free attribute)" as being toll-free.

On the receiving side, since the position is reversed, the calling number becomes the called number, and the "Called address" becomes "Called number +
Called sub-address (+ free dial attribute) ", and once the attribute is detected, the call ending process is performed once, and thereafter, the call setting is made by using the called number as the calling number and the call is sent.

As described above, by using the call control information, the connection as a toll-free is completed before the connection such as voice is completed.

[0058]

As described above, according to the present invention, it is possible to send necessary data only by transmitting / receiving the call control information without connecting the channel of the B channel between the terminal device and the center device. In addition, efficiency and speed of data transmission / reception can be easily achieved.

Further, according to the present invention, by freely setting the information of the call setup message of the layer 3 call control information of the D channel in the line control of ISDN, the toll-free dial [registered trademark of Nippon Telegraph and Telephone Corporation ] It is possible to easily deploy to various services such as functions.

In a general security system using ISDN, it is not necessary to constantly perform polling from the center device side, and in the concrete name of the ISDN communication network, IN
By using S-Net service's "Called number display during communication" etc., even if the terminal device is busy with normal voice, the information itself will not be busy and will be transmitted to the center device. Demonstrate.

[Brief description of drawings]

FIG. 1 is an explanatory diagram illustrating a configuration of a system embodiment of the present invention.

FIG. 2 is a block diagram showing a connection configuration of a transmission encoding device according to an embodiment of the present invention.

FIG. 3 is a block diagram showing a more detailed structure of the transmission encoding device.

FIG. 4 is an explanatory diagram showing a preferred example of a format of call control information for implementing the method example of the present invention.

5 is an explanatory diagram showing information elements of a sub address in the call control information format shown in FIG.

FIG. 6 is an explanatory diagram for explaining an example in which information is specifically set to a sub address in the above.

FIG. 7 is an operation flow showing the operation of the entire system of the present invention.

FIG. 8 is an operational flow when transmitting data in the encoding transmission device.

FIG. 9 is an operational flow when receiving data in the encoding transmission device.

FIG. 10 is an explanatory diagram showing an example of a conventional data communication method.

[Explanation of symbols]

α ... ISDN 1 ... Terminal device 2, 4 ... Transmission control device 3 ... Center device 5, 6 ... Transmission coding device 7 ... Coding circuit (CODECK) 8 ... Data communication control unit 9 ... Call control information control unit 9a ... Setting Part 9b ... Storage part 9c ... Identification part 9d ... Encoding part 10 ... Terminal adapter (TA) 11 ... Transmission control part 12 ... Remote control interface (IF) 13a, 13b ... Data communication control interface (I
F) 14 ... I / O 15 ... System control unit 16 ... Operation unit 17 ... Display unit

Claims (8)

[Claims] 1. When transmitting and receiving call control information of a D channel between devices connected to an ISDN, a predetermined data signal is set in a call setting message of call control information of a calling side device and sent out, and a called side device. The data communication method using call control of ISDN, wherein the data signal set in the call setup message is taken out and used as internal information or external output of the receiving side device. 2. The data communication method using call control of ISDN according to claim 1, wherein the location where the data signal is set is in the called number of each information element of the call setup message. 3. The data using call control of ISDN according to claim 2, wherein the place where the data signal is set is the called subaddress of the called number and the called number classified into the called subaddress. Communication method. 4. The data communication method using call control of ISDN according to claim 1, wherein the location where the data signal is set is in the calling number of each information element of the call setup message. 5. The data using call control of ISDN according to claim 4, wherein the location for setting the data signal is a calling subaddress of calling numbers classified into a calling number and a calling subaddress. Communication method. 6. The data communication method using call control of ISDN according to claim 1, 2, 3, 4, or 5, wherein the layer used is a network layer. 7. A transmission encoding device for connecting an ISDN network to a main unit or a terminal unit, a system control unit for controlling the operation of each unit in the unit, and an image / sound etc. input from the main unit or the terminal unit. An encoding circuit that encodes data suitable for communication using ISDN and decodes the data sent via ISDN, and detects the input of data from the main device or terminal device, And a data communication control unit for generating call control information for communication via the ISDN and outputting the call control information sent via the ISDN to the main device or the terminal device, and the data communication control unit. The call control information is taken out, a predetermined data signal is set in the call setup message of the call control information and sent, and the call control information is sent to the sent call control information. A call for judging whether or not a predetermined data signal is included in the transmitted call control information and, if the predetermined data signal is included, extracting and decoding the predetermined data signal A control information control unit, a transmission control unit for controlling transmission of call control information, data transmitted from the encoding circuit and call control information transmitted from the transmission control unit to the ISDN, and ISDN An ISDN connection device that receives data and call control information sent via the ISDN, and a transmission encoding device that uses ISDN call control. 8. A call control information control unit, a setting unit for setting predetermined information in a call setting message of call control information to be transmitted, a storage unit for storing the information, and coding the call control information to be transmitted, and A coding unit for decoding the call setup message of the call control information transmitted via the ISDN; an identification unit for identifying and extracting a predetermined data signal from the call setup message of the transmitted call control information; The transmission coding apparatus using call control of ISDN according to claim 7, further comprising: