JPS59205841A - Data transmission speed control system - Google Patents
Data transmission speed control systemInfo
- Publication number
- JPS59205841A JPS59205841A JP58080190A JP8019083A JPS59205841A JP S59205841 A JPS59205841 A JP S59205841A JP 58080190 A JP58080190 A JP 58080190A JP 8019083 A JP8019083 A JP 8019083A JP S59205841 A JPS59205841 A JP S59205841A
- Authority
- JP
- Japan
- Prior art keywords
- transmission
- data
- request signal
- error
- transmission speed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
- H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1438—Negotiation of transmission parameters prior to communication
- H04L5/1446—Negotiation of transmission parameters prior to communication of transmission speed
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Quality & Reliability (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、誤シ制御機能を有するファクシミリ装置等の
データ伝送速度制御方式に関し、特に電話交換網を用い
て接続回線の伝送品質の変動に対応して適宜な伝送速度
でデータ伝送するための方式に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a data transmission rate control system for facsimile machines and the like having an error control function, and in particular, the present invention relates to a data transmission rate control system for facsimile machines and the like having an error control function. This invention relates to a method for transmitting data.
電話交換網を用いたファクタＳ ＋７通信等に使用する
データ伝送装置においては、一般に自動再送訂正方式に
よ今誤シ制御を行なっている。すなわち、受信側で受信
データ中に誤りを検出すると再送要求信号を送信側へ返
送し、送信側から送信データを再送することによシ誤シ
のない受信画像を再現している。この場合、データ伝送
速度は、ファクシミリデータの送信開始時に決められた
一定の伝送速度で複数枚の原稿を送信している。上述の
従来方式は、伝送途中で回線品質が劣化した場合は再送
回数が増加し、所要の原稿を伝送する丸めのファクシミ
リデータの所要伝送時間が増大するという欠点がある。In data transmission equipment used for factor S+7 communication using a telephone switching network, error control is generally performed using an automatic retransmission correction method. That is, when the receiving side detects an error in the received data, it sends a retransmission request signal back to the transmitting side, and by retransmitting the transmitted data from the transmitting side, a received image without errors is reproduced. In this case, a plurality of original documents are transmitted at a constant data transmission speed determined at the time of starting transmission of facsimile data. The above-mentioned conventional method has the drawback that if the line quality deteriorates during transmission, the number of retransmissions increases, and the time required to transmit rounded facsimile data to transmit the desired original document increases.
本発明の目的は、上述の従来の欠点を解決し、接続回線
の伝送品質の変化に適合するようにデータ伝送速度を変
更して効率的なファクシミリ伝送等を行なうことができ
るデータ伝送速度制御方式を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional drawbacks and to provide a data transmission rate control method that can change the data transmission rate to adapt to changes in the transmission quality of a connection line and perform efficient facsimile transmission, etc. Our goal is to provide the following.
本発明の伝送速度制御方式は、誤シ制御機能を有するデ
ータ伝送装置において、送信側装置は送信データをブロ
ックに分割して順次送信する伝送制御部と、受信側から
の再送要求信号を検出する再送要求信号検出器と、該再
送要求信号検出器の出力によシ再送要求回数を計数し計
数結果に基△
変更する手段とを備え、受信側装置は誤シ符号検出器と
、該誤シ符号検出器の出力によシ再送要求信号を送出す
る再送要求信号発生器とを備えて、受信ブロックの誤シ
回数または誤り率が一定値を超えたとき受信側からの要
求によシまたは送信側の判断により送信データ速度を変
更することを特徴とする。The transmission rate control method of the present invention is a data transmission device having an error control function, in which a transmitting side device has a transmission control unit that divides transmission data into blocks and sequentially transmits them, and detects a retransmission request signal from a receiving side. The receiving device includes a retransmission request signal detector and means for counting the number of retransmission requests based on the output of the retransmission request signal detector and changing the number of retransmission requests based on the counting result. and a retransmission request signal generator that sends out a retransmission request signal in response to the output of the code detector. It is characterized by changing the transmission data rate according to the judgment of the side.
次に、本発明について、図面を参照して詳細に説明する
。Next, the present invention will be explained in detail with reference to the drawings.
第１図は、本発明の一実施例を示すブロック図である。FIG. 1 is a block diagram showing one embodiment of the present invention.
すなわち、送信側装置Ａは、読取部１で原稿を走査しド
ツト形式の画信号を出力する。該画信号は符号器２で符
号化されて伝送制御部３へ送られる。伝送制御部３は、
符号器２の出力データをブロック単位に分割し、ブロッ
クごとに誤シ検出符号発生器６の出力する誤シ検出用信
号を付加してモデム７を介して回線に送出する。回線は
公衆電話網を用いて受信側装置Ｂに接続されている。送
信データは、ブロック単位で再送用メモリ５に蓄積して
おいて、受信側からの再送要求に応じて再送出来るよう
にしである。すなわち、受信側から再送要求があれば、
再送要求信号検出器４で検出して必要なデータをブロッ
ク単位で再送出する。このときカウンタ９は再送回数を
カウントする。That is, the sending device A scans a document with the reading section 1 and outputs an image signal in dot format. The image signal is encoded by an encoder 2 and sent to a transmission control section 3. The transmission control section 3 is
The output data of the encoder 2 is divided into blocks, and an error detection signal output from an error detection code generator 6 is added to each block, and the data is sent to the line via the modem 7. The line is connected to receiving device B using the public telephone network. Transmission data is stored in the retransmission memory 5 in block units so that it can be retransmitted in response to a retransmission request from the receiving side. In other words, if there is a retransmission request from the receiving side,
A retransmission request signal detector 4 detects the data and retransmits the necessary data block by block. At this time, the counter 9 counts the number of retransmissions.
受信側装置Ｂは、受信信号をモデム７でデータ信号に復
調して伝送制御部３に供給し、受信データはブロックご
とに誤シ符号検出器１０で誤シ検出がなされる。誤シの
ないデータブロックは復号器１１に送られて、ここで例
えば１ライン分のドツト形式の画信号に復号され、記録
部１２で受信記録−が得られる。誤りが検出されたとき
は、再送要求信号発生器８から再送要求信号を出力し、
モデム７を通して送信側へ返送すると共に、ｋ”４１）
データブロック数がカウンタ９に計数される。The receiving device B demodulates the received signal into a data signal using the modem 7 and supplies it to the transmission control unit 3, and the received data is subjected to error code detection for each block by the error code detector 10. The data blocks without errors are sent to the decoder 11, where they are decoded into, for example, one line of dot-form image signals, and the recording section 12 obtains a reception record. When an error is detected, a retransmission request signal is output from the retransmission request signal generator 8,
k”41)
The number of data blocks is counted by the counter 9.
第２図は、再送要求信号、と、送信ブロックデータをフ
ィルタによって帯域分離した全二重通信方式による送信
側と受信側の信号授受を示す信号シーケンス図である。FIG. 2 is a signal sequence diagram showing a retransmission request signal and signal exchange between a transmitting side and a receiving side using a full-duplex communication system in which the transmission block data is band-separated by a filter.
すなわち、送信ブロックデータの送信開始に先立って、
（ＣＣＩＴＴ勧告Ｔ、３０に従って）受信側装置Ｂから
の送信要求信号２０を受けると送信側装置Ａから伝送速
度を決定するだめの受信命令信号２１（トレーニング信
号を含む）を送出し、受信側装置Ｂは誤り率等をも考慮
してデータ伝送速度要求等を含む応答信号２２を返送す
る。次に、送信側装置Ａが送信ブロックデータの伝送速
度を決定して送信を開始する。受信側装置Ｂは、受信デ
ータブロックＴ。、■８．・・・■。That is, prior to starting transmission of transmission block data,
(According to CCITT Recommendation T, 30) Upon receiving the transmission request signal 20 from the receiving device B, the transmitting device A sends out a receiving command signal 21 (including a training signal) for determining the transmission rate, and the receiving device B returns a response signal 22 including a data transmission rate request, etc., taking into account the error rate and the like. Next, the sending device A determines the transmission speed of the sending block data and starts sending it. The receiving device B receives the received data block T. ,■8. ...■.
中に誤りデータブロックを検出すると、再送要求信号２
３を送出すると共にカウンタ９に誤シデータプロック数
を計数する。受信側の伝送制御部３は、カウンタ９の計
数結果を１原稿終了信号２４受信後にチェックし、ブロ
ック誤り回数またはブロック誤シ率が規定値（例えば３
０ブロツクまたは５０チ等）以上であれば、次の原稿よ
シ伝送速度を下げて欲しい旨の送信要求信号２０を送出
する。送信側装置Ａは次の原稿から伝送速度を下げて送
信を行なう。すなわち、原稿１枚ごとのブロック誤少数
に応じて、次の原稿のデータ伝送速度を決定することが
できる。従って、データ伝送中に回線品質が劣化したよ
うな場合は、データ伝送速度を下げることによって再送
回数を減少させて、回線品質に適合したデータ伝送速度
とし、効率のよいデータ伝送がなされるという効果があ
る。If an error data block is detected in the data block, retransmission request signal 2 is sent.
3, and the counter 9 counts the number of erroneous data blocks. The transmission control unit 3 on the receiving side checks the count result of the counter 9 after receiving the 1-document end signal 24, and checks if the number of block errors or the block error rate is a specified value (for example, 3
0 block or 50 blocks, etc.), a transmission request signal 20 is sent to the effect that the transmission speed of the next document should be lowered. The sending device A lowers the transmission speed and transmits the next document. That is, the data transmission speed of the next document can be determined according to the number of block errors for each document. Therefore, if the line quality deteriorates during data transmission, the number of retransmissions is reduced by lowering the data transmission speed, and the data transmission speed matches the line quality, resulting in more efficient data transmission. There is.
また、送信側装置Ａでは、再送要求信号検出器４で検出
した再送要求信号の回数が、カウンタ９によって計数さ
れる。伝送制御部３はデータ送信中カウンタ９を監視し
続けて、ブロック誤少数またはブロック誤シ率を算出し
、規定値（例えば３０回もしくは５０ｑ６等）を超えた
ときは、一旦送信を中断して伝送速度を下げる旨の受信
命令信号２１を送出し、受信側からの応答信号２２を受
信後伝送速度を下げて引続きブロックデータの送信を行
なうことも可能である。このようにすれば１枚の原稿の
送信途中でも回線品質の変動に対応してデー タ伝送速
度を制御することができる。Further, in the transmitting device A, a counter 9 counts the number of times the retransmission request signal is detected by the retransmission request signal detector 4 . The transmission control unit 3 continues to monitor the counter 9 during data transmission, calculates the number of block errors or the block error rate, and when it exceeds a specified value (for example, 30 times or 50q6, etc.), it temporarily suspends the transmission. It is also possible to send a reception command signal 21 to lower the transmission rate, and after receiving a response signal 22 from the receiving side, lower the transmission rate and continue transmitting block data. In this way, the data transmission speed can be controlled in response to fluctuations in line quality even during the transmission of a single document.
以上の説明から明らかなように、受信側、送信側のいず
れか一方または双方で、ブロック誤シ率またはブロック
誤り回数を算出し、いずれからでも通信速度の変更要求
または変更指示を行なうことが可能である。まだ、通信
制御信号を（ＣＣＩＴＴ勧告Ｔ、勧告色同様に））、フ
ァクシミリデータを伝送する高速モデムとは別の低速モ
デムによって送受信するようにすれば、高速モデムによ
るデータ板送速度とは無関係に、いつでも高速モデムの
信号速度の変更指示が可能であり、速度のフォールバッ
ク等の制御が可能となる。As is clear from the above explanation, it is possible to calculate the block error rate or the number of block errors on either the receiving side or the transmitting side, or both, and request or instruct a change in the communication speed from either side. It is. However, if communication control signals (as well as CCITT Recommendation T and Recommendation Color) are sent and received by a low-speed modem that is separate from the high-speed modem that transmits facsimile data, the data plate transmission rate by the high-speed modem will be independent. It is possible to instruct the signal speed of the high-speed modem to change at any time, and control such as speed fallback becomes possible.
以上のように、本発明においては１．送信側装置および
又は受信側装置で再送ブロックの回数またはプ「Ｊツク
誤シ率を管理して、一定回数または一定率以上の誤シ検
出結果によシデータ伝送速度を変更するように構成した
から、１枚の原稿単位または１枚の原稿送信途中でも回
線品質の変動に応じたデータ伝送速度に制御することが
できる。すなわち、回線品質の変動に応じた効率のよい
データ伝送が可能となり、伝送効率を向上させることが
できるという効果がある。As mentioned above, in the present invention, 1. The sending device and/or the receiving device is configured to manage the number of retransmission blocks or the block error rate, and change the data transmission speed depending on the result of detecting errors a certain number of times or a certain rate. , it is possible to control the data transmission speed according to fluctuations in line quality for each original or even during the transmission of one original.In other words, it is possible to control the data transmission speed according to fluctuations in line quality. This has the effect of improving efficiency.
第１図は本発明の一実施例を示すブロック図１、第２図
は上記実施例の信号授受の７−ケンスを示す図である。
図におい−Ｃ，１・・・読取部、２・・・符号器、３・
・・伝送制御部、４・・・再送要求信号検出器、訃・・
再送用メモリ、６・・・誤シ検出符号発生器、７・・・
モデム、８・・・再送要求信号発生器、９・・・カウン
タ、１ｏ・・・誤シ符号検出器、１１・・・復号器、１
２・・・記録部。
代理人 弁理士 住田俊宗
第FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a diagram showing a 7-can for signal exchange in the above embodiment. In the figure -C, 1...Reading section, 2...Encoder, 3.
...Transmission control unit, 4...Retransmission request signal detector, Death...
Retransmission memory, 6... Erroneous detection code generator, 7...
Modem, 8... Retransmission request signal generator, 9... Counter, 1o... Erroneous code detector, 11... Decoder, 1
2... Recording department. Agent Patent Attorney Toshimune Sumita
Claims (1)
装置は送信データをブロックに分割して順次送信する伝
送、制、両部と、受信側からの再送要求信号を検出する
再送要求信号検出器と、該再送要求信号検出器の出力に
よシ再送要求回数を計数信データ速度を変更する手段と
を備え、受信側装置は誤シ符号検出器と、該誤シ符号検
出器の出力Ｖこよシ再送要求信号を送出する再送要求信
号発生器とを備えて、受信ブロックの誤シ回数または誤
シ率が一定値を超えたとき受信側からの要求によシまた
は送信側の判断によシ送信データ速度を変更することを
特徴とするデータ伝送速度制御方式０In a data transmission device having an error control function, a transmitting side device has a transmission control section that divides transmission data into blocks and sequentially transmits them, and a retransmission request signal detector that detects a retransmission request signal from the receiving side. , means for counting the number of retransmission requests based on the output of the retransmission request signal detector, and changing the data rate, and the receiving side device includes an erroneous code detector and an output V koyoshi of the erroneous code detector. and a retransmission request signal generator that sends out a retransmission request signal, and when the number of errors or the error rate of a received block exceeds a certain value, the signal is transmitted according to a request from the receiving side or at the discretion of the transmitting side. Data transmission rate control method 0 characterized by changing data rate
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58080190A JPS59205841A (en) | 1983-05-10 | 1983-05-10 | Data transmission speed control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58080190A JPS59205841A (en) | 1983-05-10 | 1983-05-10 | Data transmission speed control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59205841A true JPS59205841A (en) | 1984-11-21 |
Family
ID=13711454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58080190A Pending JPS59205841A (en) | 1983-05-10 | 1983-05-10 | Data transmission speed control system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59205841A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6387048A (en) * | 1986-09-18 | 1988-04-18 | ラカル データー コミュニケーションズ インコーポレーテッド | High speed modem |
| JPS63246048A (en) * | 1987-04-01 | 1988-10-13 | Matsushita Electric Works Ltd | Wireless signal transmission system |
| FR2621763A1 (en) * | 1987-10-09 | 1989-04-14 | Ricoh Kk | FAX HAVING A SELECTIVE SLOWDOWN FUNCTION OF ITS TRANSMISSION SPEED AND METHOD OF IMPLEMENTING THIS SLOWDOWN FUNCTION |
| JPH01141431A (en) * | 1987-11-28 | 1989-06-02 | Canon Inc | Communication equipment with error re-sending function |
-
1983
- 1983-05-10 JP JP58080190A patent/JPS59205841A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6387048A (en) * | 1986-09-18 | 1988-04-18 | ラカル データー コミュニケーションズ インコーポレーテッド | High speed modem |
| JPS63246048A (en) * | 1987-04-01 | 1988-10-13 | Matsushita Electric Works Ltd | Wireless signal transmission system |
| FR2621763A1 (en) * | 1987-10-09 | 1989-04-14 | Ricoh Kk | FAX HAVING A SELECTIVE SLOWDOWN FUNCTION OF ITS TRANSMISSION SPEED AND METHOD OF IMPLEMENTING THIS SLOWDOWN FUNCTION |
| JPH01141431A (en) * | 1987-11-28 | 1989-06-02 | Canon Inc | Communication equipment with error re-sending function |
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