JPH0614083A - Osi communication method - Google Patents

Abstract

PURPOSE:To improve the convenience of communication by transmitting plural data of different kinds with each other while one session layer protocol sequence is in execution. CONSTITUTION:A system control section 2 of a communication terminal equipment 1 controls each section of the system according to a program in a ROM 3 and executes a protocol sequence. When a caller terminal enters the data transfer phase the session connection is set up in the session layer protocol. Then the caller terminal transmits information relating to plural picture data of different kinds to a CD-SPDU, and a called party terminal replies the information while setting communication available capability information in a CDA- SPDU. As a result, the transmission of the CD-SPDU for each picture type is not required and since picture data use information is sent from the transmission of activity start SPDU till the transmission of activity end SPDU, plural picture data of different kinds are transmitted without terminating the activity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an OSI communication method, and more particularly to a communication method applied to a communication device having a layer 1 to layer 5 transmission capability for a plurality of data conforming to OSI.

[0002]

2. Description of the Related Art Generally, OSI (Open System)
ms Interconnection) is called an open system interconnection, and is a standardized network architecture for enabling communication between different models. The standardization work of this OSI is CCITT (Int
international Telegraph and T
elephone Consulative Com
miteee: International Telegraph and Telephone Advisory Committee) and IS
O (International)
on For Standardization: International Standards Organization). OS like this
In the communication method of the I method, for example, it is possible to transmit a plurality of files different in encoding method from each other, and this communication method is applied to a composite terminal or a multimedia terminal that can use a plurality of services. To be done.

[0003]

However, in the conventional OSI communication method, when a plurality of files having different encoding systems are transmitted, it is necessary to execute the session layer protocol for each file type. was there. In addition, so-called MHS (Mes) that sends files of different types as messages using the same protocol
The Sage Handling System) is known, but in order to use it, it is necessary to have the MHS protocol. Therefore, when transmitting a plurality of files having different encoding systems, there is a problem in terms of simplicity of communication control and convenience of communication.

Therefore, according to the present invention, it is possible to improve the convenience of communication by adding simple communication control by enabling transmission of a plurality of data of different types in one session layer protocol. It is an object to provide an OSI communication method. Incidentally, JP-A-63-1
The communication device described in Japanese Patent Publication No. 0970 has a CCITT recommendation T.264 which is a session layer protocol of G4 facsimile. Although the ability exchange method based on 62 is described,
T. In 62, there is no concept of transmitting a plurality of files of different types in one session layer protocol.

[0005]

The invention according to claim 1 is
In order to solve the above-mentioned problem, activity start, SPDU (Se) in one session layer protocol
session Protocol Data Unit)
It is characterized in that a plurality of data of different types are transmitted from the transmission to the activity end / SPDU transmission.

In order to solve the above-mentioned problems, the invention according to claim 2 sends, in a session layer protocol, information relating to a plurality of different types of data to be sent from the calling side, and then received. It is characterized in that only the receiving ability of the communicable data among the plurality of types of data is notified from the called side to the calling side based on the information.

In order to solve the above-mentioned problems, the invention according to claim 3 sends, in one session layer protocol, information relating to a plurality of different types of data to be sent from the calling side and then received. Based on the information, only the receiving ability of the data of a plurality of types that can be communicated is notified from the called side to the calling side, and then,
Activity Start SPDU (Session)
It is characterized in that a plurality of different types of data are transmitted from the transmission of the Protocol Data Unit) to the transmission of the activity end / SPDU.

[0008]

According to the invention described in claim 1, without ending the activity in one session protocol,
Different types of data can be transmitted, and the protocol can be simplified. According to the second aspect of the present invention, it is possible to exchange the receiving ability for a plurality of data different in type from each other at once, and it is not necessary to exchange the receiving ability for each type of data, and the protocol is It is simplified.

According to the third aspect of the present invention, it is possible to exchange the receiving capability for a plurality of data of different types in one session layer protocol at a time, and also in one session layer protocol. Multiple types of different data transmissions are possible without terminating the activity within. Therefore, the protocol is greatly simplified.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. 1 to 3 are diagrams showing an embodiment of a communication device to which an OSI communication method according to the present invention is applied. In addition, O according to the present invention
Computers, compound communication terminals, and the like are available as communication devices that execute the SI communication method. Here, a compound communication terminal device that makes the application clearer will be described as an example.

The communication terminal device of the present embodiment is CCITT Recommendation T.264. 62 according to CCITT Recommendation T.62, which is based on OSI. 6
G4 facsimile communication using 2bis and multivalued color images read by a television camera or a color scanner are processed by DCT (Discrete Cine Tr
It is assumed that the still image communication is performed by compressing and encoding by using the (an.

The block configuration of the apparatus of this embodiment is shown in FIG. In FIG. 1, 1 is a communication terminal device of the present embodiment, and the communication terminal device 1 is configured as follows. 2 is a system control unit, and the system control unit 2 is a ROM
According to the program in (Read Only Memory) 3, each part of the system is controlled and the protocol sequence of the present invention is executed. In ROM3,
The control program is written. Reference numeral 4 is an image memory, and the image memory 4 is a scanner 11 or a video camera 1.
The image data read from 0 or the received image data is accumulated. A RAM (Random Access) 5 stores various data for controlling the system.
6) ISDN (Integrar)
arated services Digital Net
A line control unit that performs communication control suitable for a line, such as a work protocol.

Reference numeral 7 denotes a compression / reproduction unit, which is a compression / reproduction unit 7.
For G4 facsimile communication, MMR (Modify
ed Modified Relative Elem
ent address design), and encoding / decoding by DCT or the like during still image communication. Reference numeral 8 is a printer for recording and outputting the received image data, and reference numeral 9 is an operating unit for the operator to input keys. Video camera 10
Inputs a still image, and the scanner 11 reads a document image for G4 facsimile or a color original image for still image communication. Reference numeral 12 is a display video RAM for temporarily storing the received document image or color image for displaying on the display, and 13 is a display for displaying the received image data.

The present apparatus has G4 facsimile communication and still image communication as application services, but these protocols are common from layer 1 to layer 4. Layer 5 is a T. 5 layer in G4 facsimile communication.
62bis, CCITT Recommendation X.
225. Further, the layer 6 and the layer 7 differ depending on each service.

In the case of G4 facsimile communication, an open document system (ODA (Open Document Arc)
document transfer operation (DTAM (Document Trans)) using an exchange format.
fer And Manipulation)) protocol is used. On the other hand, in the case of still image communication, a protocol suitable for still images is used. The still image protocols in layers 6 and 7 are outside the scope of the present invention, and therefore their explanations are omitted. The session layer protocol is C only for G4 facsimile communication.
CITT Recommendation T.M. 62bis is used, and CCITT Recommendation X.60 is used in other cases including the complex communication of the present invention. 225 is used.

The flow of the session layer protocol of this embodiment is shown, for example, in FIG. The operation will be described below according to the flow of FIG. All signals in FIG. 2 are SPDU (Session Protocol).
Data Unit). Further, this example shows a case where two pages of the document image and one page of the still image are sent. As can be seen from FIG. 2, the document image transmission and the still image transmission are performed in the data transfer phase MAJOR SYNC P.
Separated by OINT SPDU.

First, when the session connection is established, the calling terminal enters the data transfer phase and enters the CAP.
ABILITY DATA (hereinafter referred to as CD) SPD
Send U. In this CD SPDU, the information about the image data to be transmitted, that is, the information about the document image data and the still image data is included and transmitted. As the information about the document image data, for example, the document size,
There is a resolution, a coding method (MMR), etc., and the information about the still image data includes, for example, the size of the document, the number of pixels in the vertical and horizontal directions, the number of gradations, the coding method (DCT), and the like.

Upon receiving these pieces of information, the called terminal receives CAPABI information of its own capability for communication.
LITY DATA ACK (hereinafter referred to as CAD) S
Reply by including in PDU. The calling terminal receives this capability information and after confirming that the other party can communicate, A
CTIVITY START (hereinafter referred to as AS) SP
Send DU. In this AS SPDU, the image data to be transmitted first, that is, the information regarding the document image data in this example, is transmitted. Then, after this, the document image data is transmitted. After transmitting one page of image data,
MINOR SYNC POINT (hereinafter referred to as MIP) SPDU is transmitted. When the information regarding the image data of the second page, that is, the document size or the like changes, this information is included in the MIP SPDU and transmitted. When the MINOR SYNC ACK SPDU is received from the called side, the image data of the second page is sent out.

MAJOR means that when the image data of the second page is completely transmitted, the document image data is terminated and the still image data is continuously transmitted.
SYNC POINT SPDU (hereinafter referred to as MAP) is transmitted. This MAP SPDU is sent including information regarding still image data. MAJOR from the opponent
Upon receiving the SYNC ACK SPDU, transmission of still image data is started. Note that still images are handled on a page-by-page basis like document images. In the example shown here, since there is only one page, when transmission of still image data for one page is completed, ACTIVITY END SPDU is sent out. Then, from the called side, ACTIVITY END AC
When the K SPDU is received, the connection release phase is entered and the session layer protocol ends. In addition,
Image data is DATA TRANSFER SPDU
To be transmitted. Further, among the SPDUs shown in FIG. 2, the ACTIVITY START SPDU and MAJ
Coding examples for the OR SYNC POINTS PDU are shown in FIGS. 3 (a) and 3 (b), respectively.

As described above, in this embodiment, the CD SPD is
It is not necessary to send a CD SPDU for each image type because the U side includes information about a plurality of image data of different types and the called side responds by putting the capability information that can be communicated among them in the CDA SPDU. Can be Also, between the activity start / SPDU transmission and the activity end / SPDU transmission, that is, the AS SPDU and MAP SP before the data transmission is started.
Since the information about each image data is sent to DU, it is possible to complete the activity without terminating the activity.
It is possible to transmit a plurality of different types of image data.

Therefore, when a plurality of data of different types are transmitted, the protocol can be greatly simplified, and the convenience of communication can be improved by adding simple communication control.

[0022]

According to the first aspect of the present invention, a plurality of different types of data can be transmitted without ending the activity in a single sensing layer protocol, so that the protocol can be simplified. Therefore, the convenience of communication can be improved by adding simple communication control.

According to the second aspect of the present invention, since the receiving ability exchange for a plurality of different types of data is performed once, it is not necessary to exchange the receiving ability for each type of data, and the protocol can be simplified. Therefore, the convenience of communication can be improved by adding simple communication control. According to the invention described in claim 3, the effect of both claim 1 and claim 2 greatly simplifies the communication layer protocol, so that the communication time can be shortened and the convenience of the apparatus can be improved. The property can be further improved.

[Brief description of drawings]

FIG. 1 is a control block diagram of a communication device that executes an OSI communication method according to the present invention.

FIG. 2 is a sequence diagram of a session layer protocol of the device of FIG.

3 shows a coding example of a signal in the protocol of FIG. 2, (a) is an ACTIVITY START SPD
It is a coding example of U, (b) is MAJOR SY
It is a coding example of NC POINT SPDU.

[Explanation of symbols]

 1 communication terminal device 2 system control unit 6 line control unit 7 compression / playback unit

Claims (3)

[Claims] 1. Activity start, SPDU (Session) in one session layer protocol
A plurality of data of different types are transmitted from the transmission of the Protocol Data Unit) to the transmission of the activity end / SPDU.
SI (Open Systems Intercon)
section) Communication method. 2. In one session layer protocol,
Information about a plurality of different types of data to be sent is sent from the calling side, and then only the receiving capability of the data of a plurality of types that can be communicated based on the received information is received from the called side. OSI (Open Systems In) characterized by being notified to the calling side
terconnection) communication method. 3. In one session layer protocol,
Information about a plurality of different types of data to be sent is sent from the calling side, and then only the receiving ability of the data of a plurality of types that can be communicated based on the received information is received from the called side. The calling party is notified, then the activity start SPDU (Sessi
On Protocol Data Unit) from transmission to activity end / SPDU transmission, a plurality of different types of data are transmitted O
SI (Open Systems Intercon)
communication) communication method.