JPH0338944A - Communication controller - Google Patents
Communication controllerInfo
- Publication number
- JPH0338944A JPH0338944A JP1174652A JP17465289A JPH0338944A JP H0338944 A JPH0338944 A JP H0338944A JP 1174652 A JP1174652 A JP 1174652A JP 17465289 A JP17465289 A JP 17465289A JP H0338944 A JPH0338944 A JP H0338944A
- Authority
- JP
- Japan
- Prior art keywords
- communication
- speed
- retransmission
- data transmission
- line
- 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 claims abstract description 14
- 238000005259 measurement Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims 1
- 230000003247 decreasing effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 230000006866 deterioration Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
Landscapes
- Communication Control (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、フレーム単位でデータ通信を行う通信制御装
置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a communication control device that performs data communication in units of frames.
従来、この種の通信制御装置は通信回線の状況に応じて
通信速度を可変する機能はなく、通信速度を変更する場
合、−度通信を終了して接続を開放したのち通信速度を
変更し、改めて通信を開始する構成であった。Conventionally, this type of communication control device does not have a function to vary the communication speed depending on the status of the communication line, and when changing the communication speed, the communication speed is changed after terminating the communication and releasing the connection. It was configured to start communication again.
上述した従来の通信制御装置は、通信速度を変更する場
合−度通信を終了して接続を開放したのちに実行するよ
うになっているので、通信回線の状況に応じて通信速度
の変更が容易に行えず、通信回線の状況の悪化により再
送のくり返しが発生しても通信速度を変更できず、遂に
はデータリンクの切断で再設定などが、発生し通信効率
を著しく低下させるという欠点がある。In the conventional communication control device described above, when changing the communication speed, it is executed after the communication ends and the connection is released, so it is easy to change the communication speed according to the communication line status. The disadvantage is that the communication speed cannot be changed even if repeated retransmissions occur due to deterioration of the communication line condition, and resetting is required when the data link is eventually disconnected, which significantly reduces communication efficiency. .
本発明の目的は、上記欠点を解決した通信制御装置を提
供することにある。An object of the present invention is to provide a communication control device that solves the above-mentioned drawbacks.
本発明の通信制御装置は、通信回線の状況の悪化により
生じた、対向する通信制御装置から再送要求フレームを
受信した頻度を測定する再送頻度測定回路と、この再送
頻度測定回路から測定値の通知を受けてデータ送出の速
度を設定し指示する速度指示回路とを有している。The communication control device of the present invention includes a retransmission frequency measurement circuit that measures the frequency with which retransmission request frames are received from an opposing communication control device due to deterioration of the communication line condition, and a notification of the measured value from the retransmission frequency measurement circuit. and a speed instruction circuit for setting and instructing the data transmission speed in response to the data transmission speed.
次に本発明について図面を参照して説明する。 Next, the present invention will be explained 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。第
１図によれば、通信制御装置は、通信制御装置本体１、
対向する通信制御装置から送出された再送要求フレーム
の頻度を測定する再送頻度測定回路２、およびデータ送
出の速度変更を指示する速度指示回路３を有し、図線接
続線４でデータの伝送回線〈図示せず）と接続する。FIG. 1 is a block diagram showing one embodiment of the present invention. According to FIG. 1, the communication control device includes a communication control device main body 1,
It has a retransmission frequency measurement circuit 2 that measures the frequency of retransmission request frames sent from the opposing communication control device, and a speed instruction circuit 3 that instructs to change the speed of data transmission. (not shown).
通信制御装置本体ｌはデータ送出速度の指示を受信した
とき、図線接続線４を介して図線に送出するデータの送
出速度を変更すると共に、回線接続線４を介して回線か
ら再送要求フレームを受信すると再送頻度測定回路２に
報告する。再送頻度測定回路２は、一定時間（回線の速
度に応じた）内の再送要求フレームの受信数により通信
状況の悪化を検出し、速度指示回路３に報告する。速度
指示回路３は報告された再送頻度の状況によりデータ送
出速度をどの程度低下させるか判断し、通信制御装置本
体１にデータ送出速度を指示する。When the communication control device body 1 receives the data transmission speed instruction, it changes the transmission speed of the data to be sent to the diagram via the diagram connection line 4, and also sends a retransmission request frame from the line via the line connection line 4. When received, it is reported to the retransmission frequency measuring circuit 2. The retransmission frequency measuring circuit 2 detects deterioration in the communication condition based on the number of retransmission request frames received within a certain period of time (according to the speed of the line) and reports it to the speed indicating circuit 3. The speed instruction circuit 3 determines how much the data sending speed should be reduced based on the reported retransmission frequency, and instructs the communication control device main body 1 about the data sending speed.
このデータ送出速度の低下により、再送要求フレームの
受信頻度が減少したと判断したとき再送頻度測定回路２
は、速度指示回路３に報告する。速度指示回路３は通信
制御装置本体１にデータ送出速度を最初の状態に戻すよ
う指示する。When it is determined that the reception frequency of retransmission request frames has decreased due to this decrease in data transmission speed, the retransmission frequency measurement circuit 2
is reported to the speed indication circuit 3. The speed instruction circuit 3 instructs the communication control device main body 1 to return the data transmission speed to the initial state.
以上説明したように本発明は通信状況の変化に応じて再
送が発生しない通信速度が常に設定できることによりデ
ータの再送、データリンクの切断、再設定などの発生頻
度を極小にすることが可能であり、常に最高の効率でデ
ータ通信が行えるという効果がある。As explained above, the present invention can always set a communication speed at which retransmission does not occur in response to changes in communication conditions, thereby minimizing the frequency of occurrences of data retransmission, data link disconnection, and resetting. , the effect is that data communication can always be performed with the highest efficiency.
第１図は本発明の通信制御装置の一実施例を示すブロッ
ク図である。
ｌ・・・・・・通信制御装置本体、２・・・・・・再送
頻度測定回路、３・・・・・・速度指示回路、４・・・
・・・図線接続線。FIG. 1 is a block diagram showing an embodiment of a communication control device of the present invention. l... Communication control device main body, 2... Retransmission frequency measurement circuit, 3... Speed instruction circuit, 4...
...Diagram connection line.
Claims (1)
タ通信を行う通信制御装置において、再送要求フレーム
を受信した頻度を測定する再送頻度測定回路と、この再
送頻度測定回路から測定値の通知を受けてデータ送出の
速度を設定し指示する速度指示回路とを有することを特
徴とする通信制御装置。In a communication control device that performs data communication using a transmission control procedure in units of frames over a line, there is a retransmission frequency measurement circuit that measures the frequency at which retransmission request frames are received, and a retransmission frequency measurement circuit that measures the frequency at which retransmission request frames are received. 1. A communication control device comprising: a speed instruction circuit for setting and instructing a transmission speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1174652A JPH0338944A (en) | 1989-07-05 | 1989-07-05 | Communication controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1174652A JPH0338944A (en) | 1989-07-05 | 1989-07-05 | Communication controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0338944A true JPH0338944A (en) | 1991-02-20 |
Family
ID=15982338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1174652A Pending JPH0338944A (en) | 1989-07-05 | 1989-07-05 | Communication controller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0338944A (en) |
-
1989
- 1989-07-05 JP JP1174652A patent/JPH0338944A/en active Pending
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