JPS5896438A - Transmission system - Google Patents
Transmission systemInfo
- Publication number
- JPS5896438A JPS5896438A JP56194450A JP19445081A JPS5896438A JP S5896438 A JPS5896438 A JP S5896438A JP 56194450 A JP56194450 A JP 56194450A JP 19445081 A JP19445081 A JP 19445081A JP S5896438 A JPS5896438 A JP S5896438A
- Authority
- JP
- Japan
- Prior art keywords
- transmission
- retransmission
- memory
- retransmissions
- counter
- 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
- 230000005540 biological transmission Effects 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 claims description 11
- 238000010586 diagram Methods 0.000 description 2
- 241001123862 Mico Species 0.000 description 1
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
- H04L1/12—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
- H04L1/1874—Buffer management
- H04L1/1877—Buffer management for semi-reliable protocols, e.g. for less sensitive applications like streaming video
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、伝送回線による情報伝送の確度を再送により
向上させる伝送方式に関し、％に、常時、伝送回線の状
ｍｋ応じた最適の再送が行なわれるようＫしたものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transmission method that improves the accuracy of information transmission over a transmission line by retransmission, and is designed to always perform optimal retransmission according to the condition of the transmission line mk. be.
従来のこの種伝送方式においては、再送を行なう同数が
一定値に設定されていたの、で、伝送回線の状態が、そ
の一定の回数を超えて少し多い回数の再送を行なえば常
態に復帰し得る場合であっても、その直＊に再送を停止
するので、常態に復帰することができず、また、これと
は逆に、再送を要せず、もしくは、わずかの回数の再送
によって常態に復し【いる場合にも所定の回数に達する
まで無用の再送を繰返さなければ、同線新などの回線の
状態が掴めないという欠点があった。In conventional transmission systems of this type, the number of retransmissions is set to a fixed value, so if the state of the transmission line is retransmitted a slightly larger number of times than the fixed number, the state of the transmission line will return to normal. Even if it does, the retransmission will be stopped immediately*, so it will not be possible to return to normal.On the other hand, if retransmission is not necessary, or a small number of retransmissions will be enough to return to normal. Even in the case of repeated retransmissions, there was a drawback that the state of the line, such as the new line, could not be grasped unless unnecessary retransmissions were repeated until a predetermined number of times were reached.
本発明の目的は、上述した従来の欠点を除去し、伝送回
線の状態に通した再送回数を選択することによって情報
伝送の効率を向上させた伝送方式を提供することにある
。An object of the present invention is to provide a transmission system that eliminates the above-mentioned conventional drawbacks and improves the efficiency of information transmission by selecting the number of retransmissions based on the state of the transmission line.
以下に図面を参照して本発明の詳細な説明する。The present invention will be described in detail below with reference to the drawings.
本発明方式により再送を行なう情報伝送の態様の例をフ
ローチャートにし【第１図に示す。図示のフローチャー
トにおいては２．情報伝送の開始時に、ステップＳ／に
て、例えば電源の投入等に応じて再送の回数を１例えば
前回伝送時の最適回数、あるいは、その伝送回線におけ
る平均的な回数などの適切な値の祷期値ｍｌｃ設定し、
ついで、ステップ８Ｊｋて１．その初期回路ｍ）ｌｃよ
り再送しながら相手局どの交信を行ない、ついで、ステ
ップ８３にて、再送回数ｔｉｃより交信し得たか否かを
判別し、交信し得なかったときには、ステップ針にて、
再送回数の現在値ｎと推定の適正な上限値との比較を行
ない、この場合には当然に現在の初期値ｎが少な過ぎる
のであるから、再送回数を現在値論から論十／に歩道さ
せ、ついで、ステップ８Ｊに戻って以上の過程を繰返す
。また、ステップ８Ｊにてｈ送回数ｎにより交信し得た
ときにはステップれに移行し、再送回数の現在値論と推
定の最適な下限値との比較を行ない、現在の初期値鳳が
多過ぎると判断したときＫは、ステップＳりにて再送回
数を現在値鳳からｍ−／ｌ／Ｃ歩遇させ、ついで、ステ
ップＳ−に戻って以上の過程を繰返し、さらに１ステツ
プれにて、現在の初期値菖が推定の下限値に比して多過
ぎることはないと判断したときには直接にステップミコ
に戻って以上の過程を繰返し、最終的には上下限の中間
にある最適再送回数にて交信を続行する。An example of the mode of information transmission in which retransmission is performed by the method of the present invention is shown in a flowchart [FIG. 1]. In the illustrated flowchart, 2. At the start of information transmission, in step S/, the number of retransmissions is set to 1, for example, the optimum number of times for the previous transmission, or an appropriate value such as the average number of times for the transmission line, depending on, for example, when the power is turned on. Set the initial value mlc,
Next, step 8Jk 1. The initial circuit m) communicates with the other station while retransmitting data from lc, and then, in step 83, it is determined from the number of retransmissions tic whether or not communication was successful. If communication was not possible, the step hand indicates
The current value n of the number of retransmissions is compared with the appropriate upper limit of the estimate, and in this case, of course, the current initial value n is too small, so the number of retransmissions can be changed from the current value theory to an argument of 10/10. , then return to step 8J and repeat the above process. In addition, in step 8J, when communication is possible with the number of h transmissions n, the process moves to step 8J, and the current value theory of the number of retransmissions is compared with the estimated optimal lower limit value, and if the current initial value is too large, When K makes the decision, K increases the number of retransmissions from the current value by m-/l/C in step S, then returns to step S- to repeat the above process, and then in one more step, When it is determined that the initial value is not too large compared to the estimated lower limit, it directly returns to step mico and repeats the above process, and finally the optimal number of retransmissions is set between the upper and lower limits. Continue communication.
なお、使用する伝送回線の状態変化の実態、あるいは、
伝送業務の実態に合わせて、適切な周期をもって以上の
過程を反復し、周期的に再送回数の適否をチェックする
。また、上述した再送回数の上限値および下限値は、そ
の伝送回線の設計時にあらかじめ適正に設定しておくこ
とができる。In addition, the actual state of change in the state of the transmission line used, or
The above process is repeated at appropriate intervals according to the actual status of the transmission service, and the suitability of the number of retransmissions is periodically checked. Further, the above-described upper and lower limits of the number of retransmissions can be appropriately set in advance when designing the transmission line.
次に、本発明伝送方式を実施する場合の制御回路の一例
を第一図に示す。ここで、ｌは制御部、コはカウンタ、
３は伝送系の入出力部、参はメモリ、Ｓは比較器である
。制御部ｌの制御により、伝送系のメインコントロール
で再送力９７ト数をメモリ亭に設定し、更に１回の伝送
時の再送カウント数をカウンターに記憶させる等の制＠
な行５゜カワンタコは再送力９ント数が何回性なわれた
かをカウントする。メモリ亭はかかる再送力９ント数な
記憶し最適値を保持する。比較器ｊは、／１ｉｌｌの伝
送が終了したときにカクンタコからその時の再送カウン
トを供給され、その再送力９ントをメモリ参の内容と比
較し、再送力９ントの方がメモリ内容より大きい場合に
はメモリ亭の内容に＋ｌを加算して制御部／に供給する
。他方、メモリ内容の方が再送力９ントより大きい場合
にはメモリ参の内容をＳ／減算して制御部ｌへ供給する
。以上の制御回路によって第１図示の手順を実行するこ
とができる。Next, FIG. 1 shows an example of a control circuit for implementing the transmission system of the present invention. Here, l is the control unit, ko is the counter,
3 is an input/output section of the transmission system, numeral 3 is a memory, and S is a comparator. Under the control of the control unit 1, the main control of the transmission system sets the number of retransmissions in the memory box, and also stores the number of retransmissions for one transmission in the counter.
Na row 5゜ Kawantako counts how many times the retransmission power 9 nt number has been repeated. The memory store stores the number of such retransmission powers and maintains the optimum value. When the transmission of /1ill is completed, comparator j is supplied with the retransmission count at that time from Kakuntako, compares the retransmission power 9 nt with the contents of the memory reference, and if the retransmission power 9 nt is larger than the memory content Then, +l is added to the contents of the memory tei and the result is supplied to the control unit. On the other hand, if the memory content is greater than the retransmission power, the content of the memory reference is subtracted by S/ and is supplied to the control unit l. The above control circuit can execute the procedure shown in the first diagram.
以上の説明から明らかなよさに、例えば公衆回−等にお
いてはその使用時によって伝送回線の状態が著しく異な
る場合があるためＫｌｆ頭に前述した欠点が屡々生ずる
が、本発明方式により例えば周期的にチェックして、情
報の再送回数をその時点における伝送（ロ）線の状１１
に通合した最適値に設定することができるので、情報伝
送の効率を、従来に比して格段に′＃ｉ上させることが
できる。As is clear from the above explanation, the above-mentioned drawbacks often occur in the Klf head because the state of the transmission line may vary markedly depending on the time of use in, for example, public telephone lines. Check the number of times the information is retransmitted and check the state of the transmission line at that time.
Since it is possible to set the optimum value in accordance with
第１ｗ！Ａは本発明伝送方式による情報伝送過程の例を
示すフローチャート、第一図は本発明方式な実施する制
御回路の一例な示すブロック図である。
ｌ・・・制御部、 −・・・カウンタ、Ｊ・・
・伝送系の入出力部、
参・・・メ篭り、 ！・・・比較器。1st w! A is a flowchart showing an example of an information transmission process according to the transmission method of the present invention, and FIG. 1 is a block diagram showing an example of a control circuit implementing the method of the present invention. l...Control unit, -...Counter, J...
・Input/output section of transmission system, reference...memory, ! ...Comparator.
Claims (1)
行なう再送の回数を、伝送回線の状態の良否に応じた最
適値に自動的に設定するようにしたことを特徴とする伝
送方式。Transmission time! A transmission method characterized in that the number of retransmissions performed in order to improve the accuracy of information transmission by IK is automatically set to an optimal value depending on the quality of the state of the transmission line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56194450A JPS5896438A (en) | 1981-12-04 | 1981-12-04 | Transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56194450A JPS5896438A (en) | 1981-12-04 | 1981-12-04 | Transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5896438A true JPS5896438A (en) | 1983-06-08 |
Family
ID=16324768
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56194450A Pending JPS5896438A (en) | 1981-12-04 | 1981-12-04 | Transmission system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5896438A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62269536A (en) * | 1986-05-19 | 1987-11-24 | Hitachi Ltd | Retransmission number control system |
| JPH0537764A (en) * | 1991-09-20 | 1993-02-12 | Fujitsu Ltd | Facsimile equipment |
| JP2003014276A (en) * | 2001-06-29 | 2003-01-15 | Sanyo Electric Co Ltd | Air conditioning ventilator |
-
1981
- 1981-12-04 JP JP56194450A patent/JPS5896438A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62269536A (en) * | 1986-05-19 | 1987-11-24 | Hitachi Ltd | Retransmission number control system |
| JPH0537764A (en) * | 1991-09-20 | 1993-02-12 | Fujitsu Ltd | Facsimile equipment |
| JP2003014276A (en) * | 2001-06-29 | 2003-01-15 | Sanyo Electric Co Ltd | Air conditioning ventilator |
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