JP3380596B2 - Communication terminal device control method and communication terminal device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is divided into a main control unit having a device function and a communication control unit having a communication function, and a predetermined primitive command / command is provided between the main control unit and the communication control unit. A method of controlling a communication terminal device for exchanging responses to realize a predetermined communication service function, and a main control unit having a device function and a communication control unit having a communication function, which are divided into the main control unit and the communication. The present invention relates to a communication terminal device for exchanging a predetermined primitive command / response between control units to realize a predetermined communication service function.

[0002]

2. Description of the Related Art Generally, a communication terminal device is divided into a main control unit having a device function and a communication control unit having a communication function, and a predetermined primitive command / response is provided between the main control unit and the communication control unit. To communicate with each other to realize a predetermined communication service function.

Conventionally, a main control unit and a communication control unit are designed and used for each communication application and each product. Therefore, for example, it is not possible to use the communication control unit of the group 4 facsimile machine as it is for a communication terminal device having another device function.

On the other hand, with the spread of ISDN, a composite service terminal device having a plurality of communication service functions and a single service terminal device having a different single communication service function have come into practical use. From that,
There is a demand for a communication control unit that can be used universally for each terminal device.

[0005]

[Problems to be Solved by the Invention] Under these circumstances,
In recent years, the function sharing form between the main control unit and the communication control unit, the functional specifications of the communication control unit, and the like have been standardized by a plurality of standardization organizations.

The present invention has been made in view of the above circumstances, and controls a communication terminal device such that the functions of the main control unit and the communication control unit can be shared, and operations such as function setting can be appropriately performed. A method and a communication terminal device are provided.

[0007]

The present invention is divided into a main control unit having a device function and a communication control unit having a communication function, and a predetermined primitive is provided between the main control unit and the communication control unit. In a control method of a communication terminal device for exchanging commands / responses to realize a predetermined communication service function, the communication control unit communicates with the main control unit by using a primitive command / response at the start of a communication operation. Notifying the service capability, the main control unit sets the communication service capability to be used in its own terminal to the communication control unit.

Further, it is divided into a main control unit having a device function and a communication control unit having a communication function, and a predetermined primitive command / response is exchanged between the main control unit and the communication control unit to perform a predetermined operation. In the method of controlling a communication terminal device that realizes the communication service function of, when the communication operation starts, the communication control unit,
Primitive command /
The communication service capability is notified using a response, and the main control unit decides the sharing of the communication function and sets it in the communication control unit.

Further, it is divided into a main control unit having a device function and a communication control unit having a communication function, and a predetermined primitive command / response is exchanged between the main control unit and the communication control unit to perform a predetermined operation. In the control method of the communication terminal device for realizing the communication service function, the main control unit and the communication control unit set primitive command / response exchange types for exchanging information at the start of operation. Is. When the stimulus method is set as the primitive command / response exchange type, the communication control unit sends the primitive command / response to the main control unit according to a predetermined transmission control procedure. As a parameter of, the main control unit sets a list of primitive commands / responses to be sent next, and the main control unit selects the primitive command / response to be sent next from the list of primitive commands / responses notified from the communication control unit. You should select a response. Further, in the list of primitive commands / responses set in the parameters of the primitive command / response, it is preferable to set the priority order in the appearance order. Further, it is divided into a main control unit having a device function and a communication control unit having a communication function, and a predetermined primitive command / response is exchanged between the main control unit and the communication control unit to perform a predetermined communication service. In a communication terminal device that realizes a function, at the start of a communication operation, the communication control unit notifies the main control unit of a communication service capability using a primitive command / response, and the main control unit causes the communication to be performed. The communication service capability used by the terminal itself is set in the control unit. Further, it is divided into a main control unit having a device function and a communication control unit having a communication function, and a predetermined primitive command / response is exchanged between the main control unit and the communication control unit to perform a predetermined communication service. In a communication terminal device that realizes a function, at the time of starting a communication operation, the communication control unit notifies the main control unit of a communication service capability by using a primitive command / response, and the main control unit uses the communication function. Is determined and set in the communication control unit. Further, it is divided into a main control unit having a device function and a communication control unit having a communication function, and a predetermined primitive command / response is exchanged between the main control unit and the communication control unit to perform a predetermined communication service. In the communication terminal device that realizes the function, the main control unit and the communication control unit set the exchange type of primitive command / response for exchanging information with each other at the start of operation.

[0010]

Therefore, since the function sharing between the main control unit and the communication control unit, the method of exchanging primitive commands / responses (handshake), etc. can be set according to each function, the same communication control unit can be set. Can be applied to a plurality of main control units, and a highly versatile communication control unit can be realized.

[0011]

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

FIG. 1 shows a communication terminal device according to an embodiment of the present invention.

In FIG. 1, this communication terminal device is a host device (main control unit) 1 having a group 3 facsimile device function and a group 4 facsimile device function.
And a communication control unit 2 having a group 3 facsimile communication function, a group 4 facsimile communication function, and a telephone communication function.

In the host device 1, the system controller 1
Reference numeral a denotes a part of control processing of each part of the host device 1 and facsimile transmission control procedure processing on the B channel, and the system memory 1b is a part of the system control part 1.
The control processing program executed by a and various data necessary for executing the processing program are stored, and the work area of the system control unit 1a is configured.

The scanner 1c is for reading an original image at a predetermined resolution, the plotter 1d is for recording and outputting an image at a predetermined resolution, and the operation display unit 1e is for this communication terminal device. It is for operating the and comprises various operation keys and various display devices.

The image storage device 1f is for storing a large amount of image information in a coded and compressed state, and the image processing unit 1g converts the resolutions of the group 3 facsimile image data and the group 4 facsimile image data to each other. Various encoding and other image processes are implemented, and the encoding / decoding unit 1h encodes and compresses the image signal and also decodes the encoded and compressed image information into the original image signal. belongs to. Also, this encoding / decoding unit 1h
Group 3 facsimile encoding mode and group 4
It has both modes of operation, a facsimile encoding mode.

Communication control unit interface circuit 1i
Is for connecting the host device 1 to the communication control unit 2 and exchanging various data with the communication control unit 2.

The system control unit 1a, the system memory 1b, the scanner 1c, the plotter 1d, the operation display unit 1e, the image storage device 1f, the image processing device 1g, the encoding / decoding unit 1h, and the communication control unit interface circuit. 1i is connected to the system bus 1j, and data is exchanged between these elements mainly via the system bus 1j.

In the communication control unit 2, the communication control unit control section 2a is for executing operation control of each section of the communication control unit 2, and the system memory 2b is executed by the communication control unit control section 2a. It stores a control processing program and various data necessary for executing the processing program, and constitutes a work area of the communication control unit control section 2a. The parameter memory 2c is unique to this communication terminal device. It is for storing various parameters.

The telephone function section 2d is for realizing a telephone communication function, and the group 4 facsimile communication control section 2e is a group 4 facsimile transmission procedure processing function (class 1, 2, 3) executed on the B channel. ), The group 3 facsimile communication control unit 2f executes a group 3 facsimile transmission control procedure processing function (including a group 3 facsimile modem function) executed by using PSTN ((analog) public telephone network). Is to realize.

The ISDN interface circuit 2g connects the communication control unit 2 to the ISDN and integrates the signal processing function of the layer 1 and the D channel (signal channel) signal and the two B channel (information channel) signals. It is for performing signal processing on the D channel of ISDN such as separation function and call setup / call release procedure processing.

The PSTN interface circuit 2h connects the communication control unit 2 to the PSTN and
This is for realizing call setup / call disconnection processing with the STN.

The host interface circuit 2i connects the communication control unit 2 to the host device 1 and exchanges various data with the host device 1.

These communication control unit control section 2a, system memory 2b, parameter memory 2c, telephone function section 2d, group 4 facsimile communication control section 2e, group 3 facsimile communication control section 2f, ISDN interface circuit 2g, PSTN interface circuit 2h. The host interface circuit 2i is connected to the system bus 2j, and data is exchanged between these elements mainly via the system bus 2j.

In this case, the communication control unit 2
Is connected only to ISDN, and the PSTN interface circuit 2h does not function effectively.

Here, the functional division of the host device 1 and the communication control unit 2 will be described.

Regarding the group 4 facsimile communication control function, consider the function sharing between the host device 1 and the communication control unit 2 in the session layer (layer 5) where a logical communication connection is set. Considering the session layer, the session user data contained in the information field of this layer carries the protocol element data (protocol stack) of the upper layers (layer 6 and layer 7).

For example, when the communication control unit 2 shares the communication functions of layer 5 and above, layers 6 and 7
Since the communication control unit 2 processes the protocol element of, the processing load of the host device 1 is reduced in this case. On the other hand, in this case, when the communication terminal device is first constructed, the application level (for example,
Group 4 facsimile class 1 document communication, class 2
& 3 mixed document communication, in-house mode relay / confidential, etc.)
Since the communication control unit 2 executes the communication process of the host device 1, when changing the function of this communication terminal device, the host device 1
It is necessary to change not only the function of the communication control unit 2 but also the function of the communication control unit 2.

When the communication control unit 2 shares the communication function of layer 5 or lower, the host device 1 executes the part of layer 6 or higher. Therefore, in this case, the processing load on the host device 1 becomes large, but when changing the function of the communication terminal device, it can be dealt with only by changing the function of the host device 1, so that a flexible communication terminal device can be realized. it can.

In view of the above, if the function sharing of the communication control unit 2 is set to layer 5 or lower, one type of communication control is performed for a plurality of applications that share a protocol of layer 5 or lower. Since the unit 2 can be applied, the versatility is higher in this case.

Now, in this embodiment, various functions are realized by exchanging primitive commands / responses in the signal format as shown in FIG. 2 between the host device 1 and the communication control unit 2. .

This primitive is an SAP (Service Access Point) for identifying which communication service the primitive is related to.
t) A number, a primitive identifier for displaying the primitive type, and a parameter having contents corresponding to the primitive type.

Here, the SAP number and the primitive identifier are arranged in all the primitive commands / responses, and are called common parts. In addition, the parameter is set to the content according to the type of each primitive command / response.

For example, the "function negotiation" primitives exchanged immediately after the start of operation between the host device 1 and the communication control unit 2 are "communication service class" and "call" as shown in FIG. 3 (a). Parameters consisting of four information elements of "control class", "function sharing class", and "handshake (H / S) service class" are arranged.

Each of these information elements consists of data of 1 octet, and in this case, the "communication service class" includes bits 1, 2, and 3, as shown in FIG.
3, 4, and 5 are effectively used, the "call control class" is the bits 1, 2, 3, and 4 are effectively used, and the "function sharing class" is the same. Bits 1 and 2 are effectively used as shown in FIG. 7D, and bits 1, 2, and 8 are effectively used as “handshake service class” as shown in FIG.

Bits 1, 2, 3, 4, and 5 of the "communication service class" are "group 3 facsimile communication service", "telephone service", "group 4 facsimile class 1 service", and "group 4 facsimile". Class 2 service "and" Group 4 facsimile class 3 service "are assigned respectively, and if each service function is provided, data 1 is set in the bit, and if not, Data 0 is set to that bit.

Bits 1, 2, of the "call control class"
3 and 4 are "Group 3 facsimile ISDN lines",
"Group 3 facsimile PSTN line", "telephone IS
The data is assigned to the "DN line" and the "telephone PSTN line", and if each has a call control function, data 1 is set in that bit, and if not, the data in that bit is set. 0 is set.

Bits 1 and 2 of "function sharing class"
Is set to “Group 4 facsimile service” and “Group 3 facsimile service”.

In the group 4 facsimile service, when the communication control unit 2 shares only the session layer (layer 5) and below, data 0 is set in bit 1.
Is set, and when the communication control unit 2 also shares the session layer and higher layers, data 1 is set in bit 1.
Is set.

In addition, during the group 3 facsimile service, the communication control unit 2 makes the CCITT recommendation T.264. When sharing 30 protocols (class 2), data 0 is set in bit 2, and when communication control unit 2 provides only a modem function (class 1), data 1 is set in bit 2.

[Handshake service class]
Bits 1, 2, and 8 are set to "group 4 facsimile service", "group 3 facsimile service", and "stimulus H / S".

When the session primitive sequence is used as the handshake method for the group 4 facsimile service, data 0 is set in bit 1. (Note that when data 1 is set in bit 1, it is reserved for future backup (not normally used).)

When the handshake method unique to the company is used as the handshake method for the group 3 facsimile service, data 0 is set in bit 2, and the handshaking method for the group 3 facsimile service is the US EIA (Electronic).
Industries Association) / T
IA (Telecommunications Ind
standards Association) TR-
When using 29, bit 2 is set to data 0.

When the non-stimulus handshake method is used for all services, bit 8
Is set to data 0 and bit 8 is set to data 1 if the stimulus handshake scheme is used for all services.

Further, the host device 1 and the communication control unit 2
As shown in FIG. 4A, a “group 4 error recovery priority list” is included in the “function setting” primitive that is exchanged after the “function negotiation” primitive.
And m parameters for designating the communication function to be used are arranged.

Here, the "group 4 error recovery priority list" is formed by arranging the following three types of contents in accordance with the set priority order (the one that appears first has a higher priority order). Motsu; see FIG. 4 (b).

(A) When an error occurs, S_U. The Abort procedure (session layer) is executed, and the line disconnection recovery is executed (the parameter value is 01H (H indicates a hexadecimal number; the same applies hereinafter).

(B) When an error occurs, the line disconnection recovery procedure is immediately executed (parameter value is 02H).

(C) When an error occurs, the CCITT-specified recovery procedure is executed, and the session connection continues (parameter value is 03H).

With the above configuration, when the system is reset, this communication terminal device performs the operation as shown in FIG.

First, the host device 1 sends the "function negotiation" primitive as a function negotiation request command to the communication control unit 2, and then the communication control unit 2 sends the "function negotiation" primitive as a function negotiation confirmation response to the host device 1. Send to.

As a result, the host device 1 refers to the content of the received function negotiation confirmation response and determines the communication function (group 4 facsimile class 1 in this case) to be used at that time.

Next, the host device 1 designates the group 4 error recovery priority at that time, and uses a "function setting" primitive in which a parameter for notifying the communication function used at that time is set as a function setting request command. It is sent to the communication control unit 2.

As a result, the communication control unit 2 internally sets the contents set at that time, and
The “function setting” primitive is sent to the host device 1 as a function setting confirmation response.

Further, in order for this communication terminal device to perform group 4 facsimile communication with any of the other terminals, the other terminal is called and an information channel is established with the other terminal. When the communication control unit 2 establishes up to layer 4 on the information channel with the partner terminal at that time, it starts processing of layer 5 and above.

At this time, when the function allocation of the communication control unit 2 is set to layer 5 or higher, the operation as shown in FIG. 6 is executed between the host device 1 and the communication control unit 2. It

First, the host device 1 sends a primitive S_CNN (CONNe) to command the start of a session.
(action) _REQ (REQest) to the communication control unit 2, whereby the communication control unit 2
Sends a session start command CSS for setting a session layer connection to the network.

Accordingly, when the session start acknowledgment response RSSP is returned from the partner terminal, the communication control unit 2 notifies the primitive terminal S_CONN_CONF (CON) that the partner terminal has confirmed the session start.
First) is sent to the host device 1.

Next, the host device 1 uses the primitive S_CA in order to negotiate the transmission function to be used.
PA (CAPAbility). DATA_REQ is sent to the communication control unit 2, which causes the communication control unit 2 to send the document function list command CDCL to the network.

When a document function list affirmative response RDCLP is returned from the partner terminal, the communication control unit 2 sends the primitive S_CAPA. DATA
_CONF is sent to the host device 1, whereby the reception capability is adjusted with the partner terminal.

Thereafter, similarly, protocol processing of layer 5 or higher is executed, and a predetermined group 4 facsimile communication operation is executed with the partner terminal.

Here, when the signal received from the partner terminal is invalid and, for example, the session user data includes invalid data, this data error is detected by the communication control unit 2.

In this way, when an error is detected, the primitive S_P.
EXPT (EXePTion) _IND (INDica
signal) to the host device 1.

As a result, the host device 1 selects the highest one in the group 4 error recovery priority list set at this time. In this case, the primitive S_U.
Send ABORT_CONF to the communication control unit 2.

As a result, the communication control unit 2 sends a session cancel command CSA representing cancellation of the session to the network. Upon receiving the session cancellation command CSA, the partner terminal responds with a session cancellation positive response RSAP upon accepting the cancellation of the session.

This session cancellation positive response RSA
When the communication control unit 2 receives the primitive S_U.P. ABORT_CONF is sent to the host device 1.

The host device 1 sends the primitive DISC_REQ to the communication control unit 2 in order to end the communication operation, whereby the communication control unit 2 starts the procedure for ending the information channel with the partner terminal. And execute the call disconnection procedure.

In this way, the primitives are exchanged between the host device 1 and the communication control unit 2, and the communication control procedure is executed with the partner terminal.
The group 4 facsimile communication operation is executed.

At this time, the communication control unit 2
However, since the functions of layer 5 and above are shared, an error that occurs in the data of the protocol element of the upper layer carried by the session user data is detected by the communication control unit 2, and the error detection is notified to the host device 1. Then, the processing when the error occurs is executed.

FIG. 7 shows that when the function sharing of the communication control unit 2 is set to the layer 5 or lower, it is executed between the host device 1 and the communication control unit 2 after establishing up to layer 4 on the information channel. An example of the performed operation is shown.

First, the host device 1 sends a primitive S_CNN_REQ to the communication control unit 2 in order to instruct the session start, whereby the communication control unit 2 sends a session start command for setting a session layer connection. Send CSS to the network.

As a result, when the session start acknowledgment RSSP is returned from the partner terminal, the communication control unit 2 sends the primitive S_CONN_CONF to the host device 1 notifying that the partner terminal has confirmed the session start.

Next, the host device 1 uses the primitive S_CA to negotiate the transmission function to be used.
PA. DATA_REQ is sent to the communication control unit 2, which causes the communication control unit 2 to send the document function list command CDCL to the network.

When a document function list affirmative response RDCLP is returned from the partner terminal, the communication control unit 2 sends the primitive S_CAPA. DATA
_CONF is sent to the host device 1, whereby the reception capability is adjusted with the partner terminal.

Thereafter, similarly, the protocol processing of layer 5 and above is executed, and a predetermined group 4 facsimile communication operation is executed with the partner terminal.

Here, when the signal received from the partner terminal is invalid and, for example, the session user data includes invalid data, this data error is detected by the host device 1.

When an error is detected in this way, the host device 1 selects the highest one in the group 4 error recovery priority list set at this time. In this case, the primitive S_U. Send ABORT_CONF to the communication control unit 2.

As a result, the communication control unit 2 sends a session cancel command CSA indicating cancellation of the session to the network. Upon receiving the session cancellation command CSA, the partner terminal responds with a session cancellation positive response RSAP upon accepting the cancellation of the session.

This session cancellation positive response RSA
When the communication control unit 2 receives the primitive S_U.P. ABORT_CONF is sent to the host device 1.

The host device 1 sends the primitive DISC_REQ to the communication control unit 2 in order to end the communication operation, whereby the communication control unit 2 starts the information channel end procedure with the partner terminal. And execute the call disconnection procedure.

In this way, the primitives are exchanged between the host device 1 and the communication control unit 2, and the communication control procedure is executed with the partner terminal.
The group 4 facsimile communication operation is executed.

At this time, the communication control unit 2
However, the functions of layers 5 and below are shared, and the functions of layers 6 and above are shared by the host device 1. For this reason, an error that has occurred in the protocol element data of the upper layer carried by the session user data is detected by the host device 1, and upon detection of such an error, the host device 1 immediately starts the processing when the error occurs.

6 and 7 show the case where the non-stimulus handshake method is set as the handshake procedure between the host device 1 and the communication control unit 2, the host device 1 and the communication control unit 2 are shown. When the stimulus handshake method is set as the handshake procedure between and, the operation as shown in FIG. 8 is executed.

First, the host device 1 sends the primitive S_CNN_REQ to the communication control unit 2 in order to instruct the session start, whereby the communication control unit 2 sends the session start command for setting the session layer connection. Send CSS to the network.

As a result, when the session start acknowledgment RSSP is returned from the partner terminal, the communication control unit 2 sends the primitive S_CONN_CONF to the host device 1 notifying that the partner terminal has confirmed the session start. At this time, the primitive S_CON
As a parameter of N_CONF, the primitive S_CAPA. DATA_RE
Set Q.

Next, the host device 1 uses the primitive S_CA in order to negotiate the transmission function to be used.
PA. DATA_REQ is sent to the communication control unit 2, which causes the communication control unit 2 to send the document function list command CDCL to the network.

When a document function list affirmative response RDCLP is returned from the partner terminal, the communication control unit 2 sends the primitive S_CAPA. DATA
_CONF is sent to the host device 1, whereby the reception capability is adjusted with the partner terminal. Also, this primitive S_CAPA. Primitive S_ACT that should be sent next as a parameter of DATA_CONF
(ACTivity). Set START_CONF.

Thereafter, similarly, protocol processing of layer 5 or higher is executed, and a predetermined group 4 facsimile communication operation is executed with the partner terminal.

Here, when the signal received from the partner terminal is incorrect and, for example, the session user data includes incorrect data, this data error is detected by the communication control unit 2.

In this way, when an error is detected, the primitive S_P.
EXPT_IND is sent to the host device 1. Also, the primitive S_P. As the parameter of EXP_IND, the contents of the group 4 error recovery priority list set at this time are set.

As a result, the host device 1 selects the highest one of the group 4 error recovery priority list notified at this time, and in this case, the primitive S_
U. Send ABORT_CONF to the communication control unit 2.

As a result, the communication control unit 2 sends to the network a session stop command CSA indicating that the session should be stopped. Upon receiving the session cancellation command CSA, the partner terminal responds with a session cancellation positive response RSAP upon accepting the cancellation of the session.

This session cancellation positive response RSA
When the communication control unit 2 receives the primitive S_U.P. ABORT_CONF is sent to the host device 1. Also, this primitive S_U.
As a parameter of ABORT_CONF, the primitive DISC_REQ to be sent next is set.

As a result, the host device 1 sends the primitive DISC_REQ to the communication control unit 2 in order to end the communication operation, whereby the communication control unit 2 communicates with the partner terminal to terminate the information channel. To perform the call disconnection procedure.

In this way, the primitive exchange is performed between the host device 1 and the communication control unit 2, and the communication control procedure is executed with the partner terminal.
The group 4 facsimile communication operation is executed. Also,
At this time, the communication control unit 2 sets the content of the primitive to be transmitted next to the communication control unit 2 by the host device 1 as the parameter of the primitive to be transmitted to the host device 1, so The required communication function may be very small, and the load on the host device 1 in this part is very light.

At this time, the communication control unit 2
However, this is the case where the functions of layer 5 and above are shared.

FIG. 9 shows an example of processing executed by the host device 1 when the system is reset.

First, the host device 1 sends a function negotiation request command to the communication control unit 2 (process 101) and receives a function negotiation confirmation response from the communication control unit 2 (process 102).

Next, the host device 1 refers to the contents of the function negotiation confirmation response from the communication control unit 2, sets the function parameter designating the communication function to be used at that time, and saves it (process 103). , Then group 4
The error recovery priority is specified, and a function setting request command in which a parameter for notifying the communication function used at that time is set is sent to the communication control unit 2 (process 104).

When the function setting confirmation response is received from the signal control unit 2 (process 105), the process proceeds to the next process.

FIG. 10 shows an example of processing executed by the communication control unit 2 when the system is reset.

First, when a function negotiation request command is received from the host device 1 (process 201), the communication control unit 2
Sends a function negotiation confirmation response to the host device 1 (process 202).

Next, when the function setting request command is received from the host device 1 (process 203), the function parameter designating the communication function to be used at that time is stored and set inside the own terminal, and at that time. The group 4 error recovery priority is stored (process 204), a function setting confirmation response is sent to the host device (process 205), and the process proceeds to the next process.

FIG. 11 shows a processing example of the communication control unit 2 when the primitive S_CONN_REQ is received from the host device 1.

When the primitive S_CONN_REQ is received (process 301), it is checked whether the function allocation set at that time is layer 5 or higher, and layer 6 or higher can be executed (decision 302).

When the result of the judgment 302 is YES, the contents of the session user data of the session start command CSS are created, and the frame of the session start command CSS in which the contents are set is formed (process 30).
3). When the result of determination 302 is NO,
A frame of the session start command CSS in which the contents of the session user data designated by the host device 1 is set is formed (process 304).

When the frame of the session start command CSS is formed in this way, it is sent to the network (process 305).

FIG. 12 shows the communication control unit 2 when the session start acknowledgment RSSP is received from the network.
3 shows an example of the process executed by.

When the session start affirmative response RSSP is received (process 401), it is checked whether or not the function allocation set at that time is layer 5 or higher and layer 6 or higher can be executed (decision 402).

When the result of the judgment 402 is YES, the contents of the session user data of the session start affirmative response RSSP are analyzed and it is checked whether or not it is a normal value (judgment 403). The result of judgment 403 is Y
When it becomes ES, the primitive S_CONN_CO
The NF is sent to the host device 1 (process 404).

When the result of the judgment 403 is NO, the interruption ending procedure for interrupting the session layer is executed (process 405) and the communication operation at this time is ended with an error.

Further, when the result of the judgment 402 is NO, it is checked whether or not the data length of the session user data of the session start positive response RSSP is a predetermined value (judgment 406). When the result of the determination 406 is YES, the primitive S_CONN_ in which the content of the session user data of the session start positive response RSSP received at that time is set as a parameter
The CONF is sent to the host device 1 (process 407).

When the result of the judgment 406 is NO, the processing shifts to the processing 405, the session layer is interrupted, and the communication operation at this time ends in error.

FIG. 13 shows that the primitive S_CAPA. The example of a process of the communication control unit 2 when receiving DATA_REQ is shown.

Primitive S_CAPA. DATA_R
When the EQ is received (process 501), the function allocation set at that time is layer 5 or higher, and it is checked whether or not layer 6 or higher can be executed (decision 502).

When the result of determination 502 is YES, the contents of the session user data of the document function list command CDCL are created, and the frame of the document function list command CDCL in which the contents are set is formed (process 503). Further, the result of judgment 502 is NO.
Then, the frame of the document function list command CDCL in which the contents of the session user data designated by the host device 1 is set is formed (process 50).
4).

When the frame of the document function list command CDCL is formed in this way, it is sent to the network (process 505).

FIG. 14 shows an example of the processing executed by the communication control unit 2 when the document function list positive response RDCLP session start positive response RSSP is received from the network.

Document Function List Positive Response R
When DCLP is received (process 601), it is checked whether the function allocation set at that time is layer 5 or higher and whether layer 6 or higher can be executed (decision 602).

When the result of determination 602 is YES, the document function list affirmative response RDC
The content of the LP session user data is analyzed to check whether it is a normal value (decision 603). Judgment 603
When the result is YES, the primitive S_CA
PA. DATA_CONF is sent to the host device 1 (process 604).

When the result of determination 603 is NO, an interruption ending procedure for interrupting the session layer is executed (process 605) and the communication operation at this time is ended with an error.

When the result of the judgment 602 is NO, the document function list affirmative response RDCL
It is checked whether or not the data length of the session user data of P is a predetermined value (decision 606). When the result of determination 606 is YES, the primitive S_CONN_CONF in which the content of the session user data of the document function list affirmative response RDCLP received at that time is set as a parameter is sent to the host device 1 (process 607).

When the result of the judgment 606 is NO, the processing shifts to the processing 605, the session layer is interrupted, and the communication operation at this time ends in error.

By the way, in the above-mentioned embodiment, the case where the group 4 facsimile communication is executed has been described, but the same processing is executed also when the group 3 facsimile communication is executed on the ISDN.

Further, in the above-mentioned embodiment, the case of the group 4 facsimile communication using the ISDN has been described, but the present invention can be similarly applied to the case of the group 3 facsimile communication using the PSTN. .

Further, the present invention can be similarly applied to communication terminal devices other than the above-mentioned embodiments. The applicable communication lines are ISDN and PS.
It is not limited to TN.

[0127]

As described above, according to the present invention,
Since the function sharing between the main control unit and the communication control unit and the method (handshake) of exchanging primitive commands / responses can be set according to each function, the same communication control unit can be used for multiple main controls. The present invention can be applied to a unit, and has the effect of realizing a highly versatile communication control unit.

[Brief description of drawings]

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

FIG. 2 is a schematic diagram showing an example of a signal format of a primitive exchanged between a host device and a communication control unit.

FIG. 3 is a schematic diagram showing an example of a “function negotiation” primitive.

FIG. 4 is a schematic diagram showing an example of a “function setting” primitive.

5 is a time chart for explaining an operation executed by the device of FIG. 1 at the time of system reset.

FIG. 6 is a time chart showing an example of an operation executed between the host device and the communication control unit when the function sharing of the communication control unit is set to layer 5 or higher.

FIG. 7 is a time chart showing an example of an operation executed between the host device and the communication control unit when the function sharing of the communication control unit is set to layer 5 or lower.

FIG. 8: When the stimulus handshake method is set as the handshake procedure between the host device and the communication control unit, and the function sharing of the communication control unit is set to layer 5 or higher, the host device and the communication control are performed. The time chart which showed an example of the operation performed between units.

FIG. 9 is a flowchart showing an example of processing executed by a host device when the system is reset.

FIG. 10 is a flowchart showing an example of processing executed by the communication control unit when the system is reset.

FIG. 11: Primitive S_CONN_ from host device
The flowchart which showed the process example of a communication control unit when REQ is received.

FIG. 12: Session start acknowledgment from network RSS
The flowchart which showed an example of the process which a communication control unit performs, when P is received.

FIG. 13 shows a primitive S_CAPA.
The flowchart which showed an example of a process of a communication control unit when DATA_REQ is received.

FIG. 14 is a flowchart showing an example of processing executed by the communication control unit when a document function list positive response RDCLP session start positive response RSSP is received from the network.

[Explanation of symbols]

1 Host device (main control unit) 2 Communication control unit

Claims (8)

(57) [Claims] 1. A main control unit having a device function and a communication control unit having a communication function are divided, and a predetermined primitive command / response is exchanged between the main control unit and the communication control unit. In the method of controlling a communication terminal device that realizes the communication service function, the communication control unit notifies the main control unit of the communication service capability using a primitive command / response at the start of the communication operation. The control unit, with respect to the communication control unit,
A method for controlling a communication terminal device, comprising setting a communication service capability used by the terminal itself. 2. A main control unit having a device function and a communication control unit having a communication function are divided, and a predetermined primitive command / response is exchanged between the main control unit and the communication control unit. In the method of controlling a communication terminal device that realizes the communication service function, the communication control unit notifies the main control unit of the communication service capability using a primitive command / response at the start of the communication operation. A control method of a communication terminal device, wherein the control unit determines allocation of communication functions and sets the allocation to the communication control unit. 3. A main control unit having a device function and a communication control unit having a communication function are divided, and a predetermined primitive command / response is exchanged between the main control unit and the communication control unit. In the method of controlling a communication terminal device that realizes the communication service function, the main control unit and the communication control unit set a primitive command / response exchange type for exchanging information with each other at the start of operation. Method for controlling a communication terminal device. 4. When a stimulus method is set as an exchange type of the primitive command / response, the communication control unit sends the primitive command / response to the main control unit according to a predetermined transmission control procedure. As a command / response parameter, a list of primitive commands / responses to be sent next by the main control unit is set, and the main control unit sends next from the list of primitive commands / responses notified from the communication control unit. 4. The method of controlling a communication terminal device according to claim 3, wherein a primitive command / response is selected. 5. The method of controlling a communication terminal device according to claim 4, wherein the list of the primitive commands / responses set in the parameter of the primitive command / response has a priority set in the order of appearance thereof. 6. A main control unit having a device function and a communication control unit having a communication function are divided, and a predetermined primitive command / response is exchanged between the main control unit and the communication control unit. In the communication terminal device that realizes the communication service function, the communication control unit notifies the main control unit of the communication service capability by using a primitive command / response at the start of the communication operation. , To the above communication control unit,
A communication terminal device characterized by setting a communication service capability to be used in its own terminal. 7. A main control unit having a device function and a communication control unit having a communication function are divided, and a predetermined primitive command / response is exchanged between the main control unit and the communication control unit. In the communication terminal device that realizes the communication service function, the communication control unit notifies the main control unit of the communication service capability by using a primitive command / response at the start of the communication operation. A communication terminal device, characterized in that allocation of communication functions is determined and set in the communication control unit. 8. A main control unit having a device function and a communication control unit having a communication function are divided, and a predetermined primitive command / response is exchanged between the main control unit and the communication control unit. In the communication terminal device that realizes the communication service function, the communication terminal is characterized in that the main control unit and the communication control unit set an interaction type of a primitive command / response for exchanging information with each other at the start of operation. apparatus.