JPS6187470A - Method for controlling telematique device - Google Patents

Abstract

PURPOSE:To reduce communication time and to attain communication with high reliability by adding a parameter of page reception response timing to a procedure control command of the transmission side so as to control the response timing of a receiver. CONSTITUTION:When the user desires the reliability than the communication time because an original to be transmitted now is important, the corresponding switch is depressed, a parameter informing a return timing is added to a page boundary command at discharge of recording paper and the result is transmitted. The command is analyzed at the reception side, the coded data in a flow buffer memory FB is transferred to a buffer memory BM, decoded by a CODEC, moved to a line memory LM and recorded and reproduced by a recording section WCU.

Description

Detailed Description of the Invention ■Technical Field The present invention is applicable to the G4
The present invention relates to a telematics device control method having a control procedure for controlling the response timing of a receiving device of a telematics device such as a facsimile or teletex.

■Prior art Telematics services are conventional Gl, G2. G3
The facsimile (hereinafter abbreviated as FAX) has reached its limit. For this reason, in recent years, CCITT and other organizations have been conducting research on telematics service (Teletex, G4FAX, mixed mode machine) terminals, etc., which enable high image quality and high-speed transmission, as well as communication between different models. Proposals for control procedures (protocols) that will enable this are being studied and decided upon.

■Purpose The present invention has been made in view of the above points, and aims to shorten the communication time, and to enable the transmission side to select either communication speed or more reliable communication according to the intention of the sender through a control procedure. The object of the present invention is to provide a method for controlling a telematics device having the following functions.

■Configuration The present invention, in a telematics terminal etc. that has a plurality of page reception response timings, adds a page reception response timing parameter for this command to a procedure control command on the transmitting side, so that the reception device can respond accordingly. This configuration has a control procedure for controlling timing, and is intended to improve the procedure in a telematics terminal.

Telematics service will be provided on the following lines.

PSDN (Packet-Switched public
ic Data Network)C5DN(Circ
uit-Switched public Data
Network) PSTN (Public 5w1tc
hedTe1ephoneNetwork)ISD
N (Integrated 5 services Dig
ital Network: Service integrated network) Of these, l5DN is the favorite in the future6
In Japan, the advanced information and communication system INS (Information Network) is almost equivalent to l5DN.
k System) is about to be serviced. The present invention will be explained below using 64FAX.

FIG. 1 is a block diagram showing the configuration of a control circuit for explaining the control procedure in the case of FAX as an example in the present invention.

Generally, when attempting to improve the efficiency of line usage in communications, buffering using memory or the like is performed on the input/output device and the system for sending data to and receiving data from the line.

For FAX, line memory LM, buffer memory B
M, flow buffer memory FB, etc. are required.

Figure 1 shows the system control unit 5Ctl (System+oC
1 communication control unit CCU (
Communication Control Un
it) y reading unit VPU (Video Processes)
s Unit), recording unit WCυ (Write Cont
role Unit), operator interface unit O
It controls the PU.

Additionally, within the system control unit SCu, there is a COG that generates coded data by suppressing redundancy from the image information from the reading unit VPU, and conversely, a COG that generates coded data by suppressing redundancy and decoding the coded received data to generate the original image information. I have a decoder to play it.

Hereinafter, the CORG and decoder will be collectively referred to as C0DEC.

The communication control unit CCU executes a control procedure for communicating with a partner device through a line in response to a command from the system control unit SCU. The G4 procedure is a hierarchical procedure based on the O3I model within ISO.

G4 For FAX, C5 due to the amount of information, speed, etc.
DN, IN5 (ISDN), etc. are suitable. These lines have a high bit rate and are error-free due to the HLDC control procedure, making them easier to use than conventional Gl.
G2. This enables high-speed, high-quality transmission, which was not possible with G3 telephone lines.

When the line speed is high, the actual image information transfer time (Figure 2), pre-procedure control before image information transmission, and post-procedure control after image information transmission greatly contribute to the overall communication time efficiency. It's coming.

In general, in communication, in order to efficiently transfer image information while matching speeds between input/output devices and line speeds, buffering is performed where necessary as shown in FIG.

In such a case, 1. Conventionally, in FAX, when all the image information received in response to a page boundary command (including CDE) from the sending side has been recorded or outputted, or when the paper has been ejected, , a positive response (response) is sent back. However, in this case, it takes a considerable amount of time to finish recording the previous page due to buffering, and even more time is required to eject the recording paper. For this reason, communication time becomes inefficient due to post-procedure control.

FIG. 2 shows G4 in the telematics device of the present invention.
FIG. 2 is an explanatory diagram of one embodiment showing a control procedure when using a FAX, and this example shows a control procedure for two pages of image information due to transportation. The flow of the control procedure will be explained below.

(i) Call connection setting A procedure for establishing a call with a partner station is generally performed using a network provided by a carrier (in Japan, the National Telegraph and Telephone Public Corporation: NTT). This is the network used (PSTN, PSDN, C3DN, l5
Determined by DN(INS)).

(…) Data link layer settings The data link layer is HD as recommended by CCITT.
LC (High 1 level Data Link C
control procedures). SABM (Set ABM mode) and UA
(On numbered Accept) to establish a data link layer connection.

(ffl) Transport layer setting The transport layer is TCR (Transport
Connection Request) and TCA (
Transport ConnectionAccep
t) to establish a connection. Also, the data block size of each device is negotiated here, and the number of octets (number of bytes) of the data block to be used during communication is determined.

(iv) Session layer setting C3S (CC55 (Co 5ession 5tart)
) and R55p (Resp.

nse 5ession 5tart Po5itiv
e) establish a connection. Also, here, the I
D, abbreviations, etc. will be exchanged, and wind 5ize will be negotiated.

(V) Document settings CDCL (Command Document Cap
ability Li5t).

RDCLP (Response Document C)
ability),
CD5(Co+amand Document 5ta
rt) to establish the connection of the document layer,
CDCL and RDCLP notify each other of the capabilities of each other's devices, and mode setting is performed using CDS.

(vi) Image information transfer Here, since the connection with the other party has been set up in steps (i) to (v), image information data is transferred using the CDUI (Command Do
A header is added to the client User Information), and the header is transferred to the lower layer and sent to the line as image information.

(Header processing is executed in each layer even in lower layers.) Transmission: Image data from the reading section is sent to the line memory LM.
is input into the buffer memory BH and encoded by C0DEC.
is stored in The data in the buffer memory BH is sent to the communication control unit CCU and stored in the flow buffer memory FB. As a result, the communication control unit CCU passes the encoded data that has entered the flow buffer memory FB to the document layer, processes the header, and sends it out to the line.

During transmission, line memory LM and buffer memory B perform buffering for read speed and GODEC speed, and buffer memory BM and flow buffer memory FB perform buffering for CODEC speed and line speed.

The data input from the second receiving line is removed at each layer in the first communication control unit CCU and stored in the flow buffer memory FB as encoded data. The encoded data in the flow buffer memory FB is transferred to the buffer memory, decoded by the CODEC, and transferred to the line memory LM. The data is then recorded and reproduced by the recording unit wCU.

During reception, buffering between the line speed and CODEC speed is performed between the flow buffer memory FB and the buffer memory, and buffering between the recording speed and the CODEC speed is performed between the line memory LM and the buffer memory BM.

(vii) Page boundaries and end of document (vi)
When the first page has been sent, if there is still another document to send, use the command CDPB (Comma
nd Document Page Boundary
) notifies the receiving side of the end of the page. If the current page is the last page, use the command CDE (Comm
andDocument End) notifies the end of the document.

On the other hand, the receiving side sends a response RDPBP (Response Document) to the command CDPB.
ent PageBoundary Po5itive
), and the response RDEP (
Response Document End Po5
tive). Additionally, a page number parameter is added to these commands/responses, which allows page management and communication management using Wind 5ize negotiated in session connection.

The above response is a positive response, and if the page could not be received correctly, a negative response RDPBN (Response) will be sent.
ponse Docun+ent Page Boun
dary Negative). command CD
E. In the response RDEP, the document layer connection is terminated.

(vffl) Session End C3E (Command 5ession End) and R3EP (ResponseSession End)
d Po5itive) to terminate the session connection. The end of the transport layer is simultaneous with the end of the session layer.

(Tata) Link layer termination DISC (Disconnect) and UA (Unnu)
The link layer connection is released by (Accept).

(X) Call disconnection setting - Release the call on the held line upon completion of communication. Similar to (i), this procedure is defined depending on the network used.

As explained in (vii) above, at the page boundary (including the document end), the sending side sends the command CDPB to the receiving side and waits for the response RDPBP.At this time, if Wind 5ize is 2 or higher, The number of unconfirmed pages that have been negotiated and already sent is l1lind
If it is smaller than Size, transmission of the next page is started.

Here, the timing of returning a response to the command CDPB/CDH will be described.

The faster the response to CDPB/CDH, the less idle hold time the line will have. That is, in order to speed up one communication time, the faster the response to a command, the better.

However, in the case of FAX, etc., since the output is by hard copy, the timing for returning the response is preferably when the recording is normally ejected, but as shown in FIG. 1, the line memory LM.

Due to buffering in the buffer memory BM, flow buffer memory FB, etc., a considerable amount of data remains that has not been decoded or recorded yet at the time when the command CDPB/CDE is received. Furthermore, since recording paper ejection is mechanically controlled, it takes a considerable amount of time.

Therefore, in order to reduce these invalid times, Wind
A countermeasure can be taken by setting 5ize>1 and setting the return timing to the time when commands CDPB and CDE are received.

Wind 5ize) 1 is effective in continuous feeding, but not in single feeding. Therefore, the command CDPB/CD
Returning a response upon receiving an E is most effective in reducing communication time.

When a response is returned upon receiving a command, as described above, the flow buffer memory FB, buffer memory BM, and line memory LM contain data that has not yet been reproduced.

Therefore, after returning an affirmative response (RDPBP/RDEP), it is further decoded, and recording/reproduction and recording paper ejection are executed.

Therefore, there are risks such as occurrence of decoding errors, overheating of the recording head, and jamming of recording paper.

Decoding errors are covered by an error-free function based on the HDLC procedure, and recording paper jams are also well suited for commercial use due to the simple design of the mechanical system, and their occurrence frequency is small, making them no longer a problem.

Therefore, in the present invention, for example, there are two timings for returning a response: (a) when a command is received, and (b) when recording paper is ejected. Normally, (a) is used to shorten the communication speed, and the sending side When a highly reliable communication is desired, the method (b) is used, thereby reducing the communication speed and achieving both high reliability.

Here, in order to notify the receiving side which of (a) and (b) is to be used, it can be executed by a parameter added to the page boundary command from the sending side. For example, if the user is trying to send a very important document and wants high reliability rather than communication time, by pressing the switch to that effect, the page boundary command (
b) A parameter indicating the return timing is added and transmitted. The receiving side analyzes the above command and returns a response at the timing (b).

In the above explanation, the response return timing selection parameter was used for the page boundary command, but this can also be executed with other methods. For example, session settings (Figure 2)
However, in the case of a session, the document layer page boundary command is optimal because it includes control procedures such as reversing transmission rights.

The above explanation has been given using facsimile as an example, but it can also be applied to other communications such as teletex.

(2) Effects As explained above, the present invention has the advantage of reducing one communication time and achieving highly reliable communication by selecting a plurality of page reception response timings according to the sender's will.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a control circuit for explaining the control procedure in the case of using FAX as an example in the present invention, and FIG. It is an explanatory diagram of one example showing a control procedure. LM...line memory, BM...buffer memory,
FB...Flow buffer, family memory, CCU...Communication control unit, SCU...System control unit, OPU...Operator interface unit, vPυ...Reading unit. WCU...recording unit, CDPB, CDE...command. RD'PBP, RDEP... Response. Patent applicant Ricoh Co., Ltd. Nippon Telegraph and Telephone Public Corporation Figure 1

Claims (1)

[Claims] In telematics terminals etc. that have multiple page reception response timings, the procedure control command on the sending side
A method for controlling a telematics device, comprising a control procedure for adding a page reception response timing parameter to this command and controlling the response timing of the receiving device.