JP3423326B2 - Data communication terminal device and data communication method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication terminal device, and more particularly to a plurality of user information transfer channels (hereinafter referred to as "B channels") and one control information transfer channel (hereinafter referred to as "B channel"). And a data communication method connected to a digital circuit network such as ISDN (Integrated Digital Service Network).

[0002]

2. Description of the Related Art In recent years, data communication using a digital line network has become widespread as digital line networks such as ISDN have been developed.

By the way, in ISDN, OSI
By introducing the (Open Systems Interconnection) layer model, the control mechanism of the communication protocol (communication protocol) has been systematized. That is, the OSI layer model is a lower layer (layers 1 to 3) related to the transfer service and an upper layer related to the communication service.
It is composed of 7 layers consisting of (Layer 4 to 7),
CCITT (International Telegraph and Telephone C
The onsultative Committee: International Telegraph and Telephone Advisory Committee) and other standardization bodies have established communication protocols for each layer independently, and systematization of communication protocol control mechanisms has been achieved.

In the control procedure of the data communication terminal device which communicates on the ISDN, the data link control (layer 2) of the B channel in the telematic terminal such as facsimile, teletech or videotex is the high level data. Link control procedure (High-level
Data Link Control Procedure (HDLC) Balanced Link Access Procedure Balance
d: LAPB) is used. The HDLC is a transmission procedure for transmitting all data at a high speed in a frame format, and in the data link control by LAPB of the HDLC, a single link that sets a single logical link on one physical line is used. Signal transfer is performed by a single link (SLP).

[0005]

However, in the above-mentioned conventional data communication terminal apparatus, the plurality of B channels of ISDN have the single link LA of HDLC as described above.
They are treated as independent data links by PBs, and data transfer is performed using only one B channel in one communication. Therefore, even if the other B channels are not used, the channel capacity is limited to one B channel (transmission rate 64 kbps), and there is a problem that the efficiency of data communication is poor.

The present invention has been made in view of such problems, and a user information desired at the initial connection is desired.
Judge whether all of the information transfer channels have been acquired,
If it is determined that it has not been acquired, the user information that was acquired
Performing bulk communication using the information transfer channel
Control of the control information transfer channel at predetermined time intervals.
For transferring user information that has not been acquired by executing the procedure
By acquiring additional channels, you can check the availability of channels.
Since a large capacity transfer can be realized flexibly according to the situation,
Communication time is maximized even when the data transfer amount is small.
Data communication terminal apparatus and a data communication which can be small
The purpose is to provide a communication method .

[0007]

In order to achieve the above object, the present invention provides a digital circuit network having an interface structure composed of a plurality of user information transfer channels and one control information transfer channel. a data communication terminal device connected, a first acquiring means for acquiring user information transfer channel of a plurality of on said digital network by performing a control procedure of the control information transfer channel, high-level data using a multi-link procedure of link control, and setting means for setting a data link acquired the plurality of user information transfer channel by the first acquisition means, by said first acquisition means, initial connection Sometimes
Get all desired user information transfer channels
The determination means for determining whether or not it is possible, and the determination means
The desired user information transfer channel during initial connection.
If you decide that you have not acquired all of the channels,
User information transfer char acquired by the first acquisition means
When performing bulk communication using the channel
Execute the control procedure of the control information transfer channel at every interval
The channel for transferring user information that has not been acquired.
It is characterized in Rukoto to have a second acquisition means for acquiring pressure.

The present invention also transfers a plurality of pieces of user information.
Channel and one control information transfer channel
It has an interface structure and is connected to the digital network.
A data communication method between terminals
To execute the control procedure for the control information transfer channel.
A group for transferring multiple user information on a digital network.
First acquisition process to acquire channels and high level data
Using the multilink procedure of the link control procedure, the first
User information acquired in the acquisition step of
A setting process for setting the data link of the transfer channel,
In the first acquisition step, desired at initial connection
Were all channels for user information transfer to be acquired?
In the judgment step of judging whether or not
Channel for transferring desired user information during temporary connection
If it is determined that all of the
User information transfer channel acquired in the acquisition process
For a predetermined time when executing bulk communication using
The control procedure for the control information transfer channel is executed every
A channel for transferring user information that has not been acquired
Characterized by having a second acquisition step of acquiring
It

[0009]

[0010]

According to the data communication terminal device of the present invention, the first
The acquisition means executes the control procedure of the control information transfer channel.
To transfer multiple users' information on the digital network
Channel is acquired and the setting means sets the high-level data
First acquisition using multilink procedure of link control procedure
Channels for transferring a plurality of user information acquired by means
Data link of the
Depending on the stage, transfer of desired user information in initial connection
It is judged whether all of the channels for
The acquisition means determines by the determination means when the initial connection is desired.
All of the user information transfer channels
If it is determined that there is no, it was able to be acquired by the first acquisition means
Performs bulk communication using the user information transfer channel
Control information transfer channel at predetermined time intervals.
The user information that has not been acquired by executing the channel control procedure.
Acquire additional channels for information transfer.

According to the data communication method of the present invention, the first
Acquisition process executes control procedure of control information transfer channel
To transfer multiple users' information on the digital network
Channel for high-level data acquisition
First acquisition using multilink procedure of link control procedure
Multiple user information transfer chars acquired in the process
Setting the data link of the channel, the judgment process is the first acquisition
In the process, desired user information at initial connection
Judge whether all of the information transfer channels have been acquired,
In the determination step, the second acquisition step is performed at the time of initial connection.
Get all desired user information transfer channels
If you decide that you have not done it, in the first acquisition process
Bulk using the acquired user information transfer channel
When performing communication, control information is generated at predetermined time intervals.
The transfer channel control procedure has not been executed and acquisition has failed.
Acquire additional user information transfer channels.

[0012]

[0013]

[0014]

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

FIG. 1 shows an example of a data communication terminal device according to the present invention, which is connected to ISDN 1 (23B + D).
2 is a block diagram of a data communication terminal device having a primary group interface structure of
From a communication control device 3 that performs B-channel data link control by executing a predetermined call control procedure, and a host computer 4 that is connected to the communication control device 3 with a multiprocessing function such as a videophone and a video conference system. It is configured.

Further, the communication control device 3 uses the ISDN1
Connected to a predetermined user / network interface (CCI
Between the line interface unit 5 for performing line control according to the TT recommendation I series), the channel interface unit 6 connected to the host computer 4, the ROM 7 storing a predetermined control program, the ISDN 1 and the host computer 4. CPU8 for communication control
And a buffer area for storing communication data and the CPU 8
RA with a work area used for control by
It is composed of M9.

Therefore, the data communication terminal apparatus according to the first invention executes the D channel control procedure to execute the ISDN1.
An acquisition means for acquiring a plurality of B channels in
Setting means for setting the data link of the plurality of B channels acquired by the acquisition means using the DLP MLP, and bulk communication using the plurality of B channels is enabled.

2 and 3 are flow charts showing the control procedure when the above-mentioned data communication terminal device makes a call.

In FIG. 2, the communication control device 3, which has received a communication request command from the host computer 4, sends a SETUP message (“call setting request” message) to all B channels provided by the line interface unit 5. It is sent to the channel and the B channel connection procedure is activated (step S101). Then, it waits for reception of a CONN message (notification that the called side has gone off-hook) from ISDN1 (step S102). When the CONN message is received from ISDN1, that is, when the acquisition of the B channel is confirmed by the D channel control procedure, the CONN ACK message (confirmation message for CONN) is sent to ISDN1 and the acquired B channel is dealt with. The channel response flag is set (step S103). That is, if all desired B channels are acquired, all channel response flags are set to bit "1", and all B
B not acquired if the channel was not acquired
The channel response flag of the channel is set to bit "0".

Then, it is judged from the channel response flag whether or not the desired number of B channels has been acquired (step S104). If all the desired B channels are not acquired, the process returns to step S102 and waits until all the desired B channels are acquired, while it is confirmed that all the desired B channels are acquired and connected. It proceeds to step S105. In step S105, the SABM (E) command is transmitted on all the connected B channels to activate the setting of the multiframe link in the extended mode. Then UA for this SABM (E) command
It waits to receive a response (acknowledgement) from ISDN 1 (step S106), and upon receiving a UA response, sets the bit of the channel usage status flag to "1" (step S107). This channel usage status flag is a flag indicating whether or not a data link has been set up for the connected B channel, and when the data link is set up, the bit is set to "1" and the data link is set up. If not set, the bit is set to "0".

Then, it is determined whether or not the data links have been set up for all the B channels connected by the channel use status flag (step S108).
If it is determined that the data links have not been set for all the B channels, the process returns to step S106 to wait for the data links to be set, while if it is determined that the data links have been set for all the B channels, the step is performed. It proceeds to S109. In step S109, an I frame for information transfer (hereinafter, referred to as “reset request”) indicating a multilink reset request frame using the B channel in which the data link is initially set in order to initialize each variable used for bulk control. "I frame"), and the control procedure shown in FIG. 3 is executed.

In FIG. 3, first, the reception of a reset request I frame corresponding to the reset request I frame sent to the called terminal (step S110) is received, and the reset request I frame is received from the called terminal. (Step S110), the multi-link reset confirmation frame (hereinafter referred to as “reset confirmation I”) from the called terminal.
Wait for reception of "frame" (step S11)
1) When receiving the reset confirmation I frame, the reset confirmation I frame is sent to the called terminal (step S).
112). Finally, a connection completion command is sent to the host computer 4 (step S113), and the process ends.

As described above, in the data communication terminal device according to the first aspect of the present invention, a plurality of B channel data links can be set in one communication, and bulk transfer of data information, that is, bulk communication becomes possible.

FIGS. 4 and 5 are flow charts showing the control procedure until the first data link is set in the called terminal when the control procedures of FIGS. 2 and 3 are executed.

In FIG. 4, first, when the SETUP message is received from the line interface section 5 by the D channel control procedure, the communication control device 3 sends an incoming call display command to the host computer 4 (step S20).
1). Next, waiting for an incoming call acceptance command from the host computer 4 (step S202), when the incoming call acceptance is made, a CONN message is sent to the ISDN1 and the instructed B channel connection operation is performed, and the B
Set the channel response flag corresponding to the channel to bit "1".
Is set (step S203). Then, it waits for the data link setup procedure from the calling terminal to be activated in the connected B channel. That is, the reception of the SABM (E) command sent from ISDN1 is waited (step S204), and when the SABM (E) command is received, the UA response is sent to ISDN1 and the corresponding B channel is used. The channel use status flag to be set is set to bit "1" (step S205). Then, for the B channel for which the data link has been set, the reception of a reset request I frame from the calling side terminal is waited (step S206), and when the reset request I frame is received from the calling side terminal, the reset request I frame is received.
After continuously sending the frame and the reset confirmation I frame to the calling terminal (step S207), the control procedure shown in FIG. 5 is executed.

That is, waiting for reception of a reset confirmation I frame from the calling terminal (step S208),
Upon receiving this reset confirmation I frame, the communication control device 3 sends a connection completion command to the host computer, and notifies the host computer 4 that the data link for bulk transfer has been set.

FIG. 6 shows the second and subsequent Bs at the called terminal.
It is a flowchart which shows the control procedure when a channel is connected.

First, after receiving the SETUP message from the called terminal by the D channel control procedure, it is judged whether or not the attributes such as the calling address and the higher layer compatibility information such as the terminal device match (step S301). ). If it matches the attribute of the call currently being communicated, ISDN
The CONN message is sent to the channel No. 1, and the channel response flag corresponding to the connected B channel is set to bit "1" (step S302), and step S3.
Go to 03. In this step S303, the connected B
Wait for activation of data link setting on the channel. That is, it waits for the reception of the SABM (E) command from ISDN1. When the SABM (E) command is received, U
The A response is sent to ISDN1, the channel use status flag for which the data link has been set is set to bit "1" (step S304), and the processing ends.

On the other hand, if the attributes do not match in step S301, a REL message (channel disconnection completion notification and call number release request) is sent to ISDN1 (step S305), and the process is terminated.

7 to 10 are flowcharts showing the control procedure of the data communication terminal device according to the second invention.
If the required number of B channels has not been acquired by executing the D channel control procedure at the time of initial connection, the data communication terminal apparatus executes the D channel control procedure again during communication to add the B channel. It has additional acquisition means to acquire.

7 and 8 show the control procedure of the connection operation at the start of communication.

In FIG. 7, first, the host computer 4
The communication control device 3, which has received the communication request command from the DUT, executes the SETU according to the D channel control procedure for all the B channels provided in the line interface unit 5.
The P message is transmitted and the B channel connection procedure is activated (step S401). Then ISDN1 to CON
Wait for N message to be received (step S40
2) When the CONN message from ISDN1 is received, that is, when the acquisition of the B channel is confirmed by the D channel control procedure, the CONN ACK message is sent to ISDN1 and the channel acquisition status corresponding to the acquired B channel. The flag is set to bit "1" (step S403), and the process proceeds to step S406.

On the other hand, if the connection request is rejected for some reason, that is, if the CONN message is not received in step S402, it is determined in step S404 whether the REL message is received (step S40).
4) If the REL message has not been received, the process returns to step S402, while if the REL message has been received, the REL COMP message (a message of channel release and call number release completion notification) is sent to ISDN1 (step S405). , And proceeds to step S406.

In step S406, the channel response flag is set. That is, regardless of whether or not the desired B channel is connected, the channel response flag corresponding to the B channel for which the called terminal has responded is set to bit "1". Next, it is determined whether or not there is a response for all B channels requested to be connected by the channel response flag (step S407), and if there is no response for all these B channels, the process returns to step S402 again, while When all B channels have responded, the channel acquisition status flag is set to bit "1" and the SABM (E) command is sent to all B channels in the connected state. Then, waiting for reception of the UA response to the sent SABM (E) command from ISDN 1 (step S409), U
When the A response is received, the channel use status flag of the corresponding B channel is set to bit "1" (step S410), and then the control procedure shown in FIG. 8 is executed.

That is, it is judged whether or not the UA response is received on all the B channels and the data link is set (step S411). This judgment is step S
Usage status flag set in 410 and step S4
This is done by comparing with the channel acquisition status flag set in 03. And all B won
If the data link is not set in the channel, the process returns to step S409 (FIG. 7) and waits for the data link to be set, while if the data link is set in all the acquired B channels, step S406. It is determined whether or not the channel response flag set in step S4 and the channel acquisition status flag set in step S403 are equal (step S412). Then, if the setting of the response flag and the setting of the acquisition status flag are the same, the process proceeds to step S414, while if the setting of the response flag and the setting of the acquisition status flag are not the same, a re-call activation interval timer is set. After starting (step S41
3) and proceeds to step S414. That is, the case where the setting of the response flag and the setting of the acquisition status flag are the same is the case where the CONN message is received and all the desired B channels are acquired in step S402, and the process directly proceeds to step S414. On the other hand, if the setting of the response flag and the setting of the acquisition status flag are not equal, step S402.
In this case, the CONN message is not received and all or part of the desired B channel cannot be acquired.
The re-call activation interval timer built into the CPU is started and the process proceeds to step S414.

After the timer times out, the control procedures shown in FIGS. 9 and 10 which will be described later are executed.

Then, in step S414,
First, the reset request I frame is transmitted to the called terminal using the B channel in which the data link is set up. Then, it waits for the reception of the corresponding reset request I frame from the called terminal (step S415). When this reset request I frame is received, it waits for the reception of the reset confirmation I frame (step S416) and this reset confirmation. After receiving the I frame, a reset confirmation I frame is sent to the called terminal (step S417). And
Finally, a connection completion command is sent to the host computer 4 (step S418), and the process ends.

9 and 10 are flow charts showing the control procedure of the calling side when the re-call activation interval timer activated in step S413 times out.

In FIG. 9, first, when the re-call activation interval timer times out, all the bits of the channel response flag set in step S406 (FIG. 7) are set to "0". Then, in step S403 (FIG. 7), the SETUP message is transmitted for all the B channels for which the channel acquisition status flag is not set to bit "1", and the B channel connection procedure is activated (step S).
502). Then, it is judged whether or not the CONN message from ISDN1 is received (step S503), and the CO
If it is determined that the NN message has been received, the CONN
The ACK message is sent to ISDN1 and the bit of the channel acquisition status flag corresponding to that B channel is set to "1" (step S504) step S5.
Proceed to 06. On the other hand, if the CONN message is not received in step S503, it is determined whether the REL message is received (step S505). If the REL message is not received, the process returns to step S503 while the REL message is received. Then, the process proceeds to step S506 without connecting the B channel.

Then, in step S506, as in step S406 (FIG. 7), the bit of the channel response flag corresponding to the B channel for which the called terminal has responded is set to "1". Next, the bits of the channel response flag in which the channel acquisition status flag is not set to bit "1" are examined to determine whether or not there has been a response for all unconnected B channels that have called again (step S507). Then, if there is no response on all the B channels, the process returns to step S503, while if there is a response on all the B channels, a data link is set on the B channel newly acquired and connected this time. Therefore, after sending the SABM (E) command to ISDN1 (step S508), the control procedure shown in FIG. 10 is executed.

That is, the reception of the UA response to the transmitted SABM (E) command is waited (step S5).
09), after receiving the UA response, after setting the bit of the channel use status flag corresponding to the corresponding connected B channel to “1” (step S510), the data link is set on all the newly acquired B channels. It is determined whether or not the data has been set (step S511), and if all the data links have not been set, the process returns to step S509, while if all the data links have been set, communication is started by referring to the channel usage status flag. B requested at the time
It is judged whether or not all of the channels are connected (step S512), and if all the B channels are connected, the process is ended as it is, while if there is a B channel that is not yet connected, a re-call is made. The activation interval timer is set and restarted (step S513), and after the time-out, the control procedure of step S501 and subsequent steps described above is repeatedly executed.

As described above, in the data communication terminal device according to the second aspect of the present invention, even when the connection is rejected for some reason at the initial connection for starting communication and the required number of B channels cannot be acquired, communication is performed. By restarting the D channel control procedure and additionally acquiring B channels by MLP of HDLC, bulk communication using a desired number of B channels becomes possible.

11 and 12 are flowcharts showing the control procedure at the time of calling of the data communication terminal device according to the third invention, wherein the data communication terminal device is an HDLC S
A first executing means for executing the LP, a second executing means for executing the MLP of the HDLC, and a third executing means for executing the control procedure of the D channel based on the execution result of the first or the second executing means. And a selection unit capable of selecting the first execution unit or the second execution unit for each communication.

That is, the host computer 4 performs data transfer in either LAPB (single mode) of SLP or bulk mode by MLP, and SL
In the case of P LAPB, the communication control unit 3 is instructed which B channel is used for data transfer. The communication control device 3 that has received the communication request command determines whether or not the bulk mode is designated by the content of the communication request command (step S601). When it is determined that the bulk mode is designated, a predetermined bulk flag is set and the own address / partner address of the data link used for all B channel LAPB control on the user / network interface is set to the address C. /
It is set to D (step S602), the bulk designation information which is a user-user information element is edited (step S603), and the process proceeds to step S605. On the other hand, if it is determined in step S601 that the bulk mode is not designated, the own address / partner address is set to the address A.
/ B (step S604), and step S605
Proceed to. It should be noted that in the subsequent procedure in LAPB, only the frame having the above-mentioned set address becomes the valid frame.

In step S606, the SETUP with the bulk designation information (user / user information element) added.
The message is sent to the called terminal and the corresponding channel (in bulk mode, all Bs on the user network interface)
In the single mode, the B channel connection procedure for the B channel instructed from the host computer 4 in the single mode is activated (step S605). Then, the CO from the called terminal
Wait for reception of NN message (step S606), C
When the receipt of the ONN message is confirmed, that is, B
When the acquisition of the channel is confirmed, the bit of the channel response flag corresponding to the connected B channel is set to "1".
(Step S607). Next, it is judged from the channel response flag whether or not there is a response for all the requested B channels (step S608), and if there is no response for all the requested B channels, the process returns to step S606, while for all the B channels. When there is a response, the control procedure shown in FIG. 12 is executed.

That is, first, in step S609, it is checked whether or not the bulk flag is set, that is, whether or not the bulk mode is set. Then, when the bulk flag is set, that is, when the step of step S602 is executed, the process proceeds to step S105 (FIG. 2) of the first invention described above, and the flow of steps S106 → ... → Step S113 is executed. Then, the data link is set on the plurality of B channels, and the process is terminated to enable the bulk communication.

On the other hand, if the bulk flag is not set in step S609, that is, if the single mode is designated, after the SABM (E) command is transmitted (step S610), the call-in terminal sends the SABM (E) command. UA
After waiting for a response reception (step S611), after receiving the UA response, the bit of the channel use status flag corresponding to the designated B channel is set to "1" and the connection completion command is transmitted to the host computer 4 ( (Step S612) The processing ends.

As described above, in the data communication terminal device according to the third aspect of the invention, the actual data transfer with the host computer 4 is performed by the data communication request command from the host computer 4 and the data reception display to the host computer 4. It is performed by a command. At this time, it is determined whether the MLP flow control is performed or the instructed B channel LAPB control is directly performed depending on whether the bulk flag is set in the data communication control device 3. It When the bulk flag is set, it is further judged which B channel of the LAPB can be used by using the channel use status flag, and the data instructed by the host computer 4 is the B channel of each LAPB. It is distributed to channels and transmitted.

13 and 14 are flowcharts showing the control procedure of the connection operation of the data communication terminal device on the called side.

In FIG. 13, the communication control device 3 which has received the SETUP message according to the D channel control procedure,
First, the contents are analyzed to determine whether or not the bulk mode is designated in the user-user information element carried in the SETUP message (step S70).
1). And if bulk mode is specified,
Similar to the bulk flag set in step S602 (FIG. 11), a predetermined bulk flag is set and the own address / partner address that is valid in the data link control is set in the address D / C (step S70).
2) Go to step S704. On the other hand, when the bulk mode is not specified, that is, when the single mode is specified, the own address / partner address is set to the address B /
It is set to A (step S703) and the process proceeds to step S704. Next, in step S704, an incoming call display indicating the presence or absence of bulk mode setting for the host computer 4 and the number of the corresponding B channel in the non-bulk mode single mode (when step S703 is executed). Send a command. Next, the reception of an incoming call acceptance command from the host computer 4 is awaited (step S7).
05), when the incoming call acceptance command is received, it is then determined whether or not the bulk flag is set (step S).
706). When it is determined that the bulk flag is set, the process proceeds to step S203 shown in FIG.
The flow of steps S203 → ... → S209 is executed to end the processing, and the bulk communication is enabled.

On the other hand, if it is determined that the bulk flag is not set, the CONN message is sent to ISDN1.
(Step S707), and waits for the reception of the SABM (E) command from the calling terminal (step S70).
8) After confirming receipt of the SABM (E) command,
The control procedure shown in FIG. 14 is executed.

That is, the UA response to the SABM (E) command is sent to ISDN1 and the channel use status flag corresponding to the designated B channel is set to bit "1" (step S709), and finally to the host computer 4. A connection completion command is sent (step S710), and the process ends.

The above embodiment has been described with respect to the data communication terminal device having the interface structure of the primary group interface, but it goes without saying that it can be similarly applied to the basic interface having the interface structure of (2B + D).

[0054]

According to the present invention, as described above in detail, according to the present invention, the first
Channel for transferring desired user information during temporary connection
It has not been able to be acquired by judging whether all of
If it is determined that the acquired user information transfer channel
For a predetermined time when executing bulk communication using
The control procedure for the control information transfer channel is executed every
A channel for transferring user information that has not been acquired
Flexible according to the availability of channels by acquiring
Since large-capacity transfer can be realized, the amount of data transferred between terminals
The communication time can be minimized even when the number of calls is small .

[0055]

[0056]

[0057]

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a data communication terminal device according to the present invention.

FIG. 2 is a flowchart showing a control procedure (1/2) at the time of making a call of the data communication terminal device according to the first invention.

FIG. 3 is a flowchart showing a control procedure (2/2) at the time of making a call of the data communication terminal device according to the first invention.

FIG. 4 is a flowchart showing a control procedure (1/2) for setting the data link of the first B channel of the called terminal of the data communication terminal apparatus according to the first invention.

FIG. 5 is a flowchart showing a control procedure (2/2) for setting the data link of the first B channel of the called side terminal of the data communication terminal apparatus according to the first invention.

FIG. 6 is a flowchart showing a control procedure for setting the data link of the second and subsequent B channels of the called terminal of the data communication terminal apparatus according to the first invention.

FIG. 7 is a flowchart showing a control procedure (1/2) of an initial connection operation at the time of making a call of the data communication terminal device according to the second invention.

FIG. 8 is a flowchart showing a control procedure (2/2) of an initial connection operation at the time of making a call of the data communication terminal device according to the second invention.

FIG. 9 is a flowchart showing a control procedure (1/2) of the reconnection operation at the time of calling of the data communication terminal device according to the second invention.

FIG. 10 is a flowchart showing a control procedure (2/2) of the reconnection operation at the time of making a call of the data communication terminal device according to the second invention.

FIG. 11 is a flowchart showing a control procedure (1/2) of the connection operation when the data communication terminal device according to the third invention makes a call.

FIG. 12 is a flowchart showing a control procedure (2/2) of the connection operation when the data communication terminal device according to the third invention makes a call.

FIG. 13 is a flowchart showing a control procedure (1/2) of the connection operation of the callee side terminal of the data communication terminal apparatus according to the third invention.

FIG. 14 is a flowchart showing a control procedure (2/2) of the connection operation of the callee side terminal of the data communication terminal apparatus according to the third invention.

[Explanation of symbols]

3 communication control device (acquisition means, setting means, additional acquisition means, first execution means, second execution means, third execution means, selection means)

Front page continued (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04L 29/08 H04L 29/00 H04L 12/02 H04L 12/56

Claims (2)

(57) [Claims] 1. A plurality of user information transfer channels and 1
A data communication terminal device connected to the digital network has an interface structure comprising a book control information transfer channel, a plurality on said digital network by performing a control procedure of the control information transfer channel first and acquisition means, using the multilink procedure of high level data link control procedure, the first was acquired by acquisition means the plurality of user information transfer channel for acquiring user information transfer channel of the setting means for setting a data link, by the first acquisition means, and optionally in the initial connection
Whether all the user information transfer channels that can be acquired
Determining means for determining whether or not the desired user at the time of initial connection is used by the determining means.
It has been determined that not all of the user information transfer channels have been acquired.
If it is set, the user who has been obtained by the first obtaining means is obtained.
Performing bulk communication using the information transfer channel
Channel for control information transfer at specified time intervals
Perform the control procedure described above to transfer user information that has not been acquired.
A second communication means for additionally acquiring a transmission channel, the data communication terminal device. 2. A plurality of user information transfer channels and 1
Interface consisting of control information transfer channel of book
Data communication end having structure and connected to digital network
A data communication method between end devices, in which the control procedure for the control information transfer channel is executed to execute the digital communication.
Channels for transferring multiple user information on the tar line network
The first acquisition step to acquire the link and the multi-link procedure of the high level data link control procedure.
Using the duplicate obtained in the first obtaining step.
Set up data links for several user information transfer channels
In the setting step for setting and the first obtaining step, the desired at initial connection
Were all channels for user information transfer to be acquired?
In the determination step of determining whether or not, in the determination step, it is desired at the time of initial connection.
If not all channels for user information transfer have been acquired
If it is determined, it was obtained caught in the first acquisition step
Performs bulk communication using the user information transfer channel
Control information transfer channel at predetermined time intervals.
The user information that has not been acquired by executing the channel control procedure.
A second acquisition step of additionally acquiring a channel for information transfer
A data communication method comprising: