JPH03139038A - Retransmission data length deciding system - Google Patents

Retransmission data length deciding system

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Publication number
JPH03139038A
JPH03139038A JP27579689A JP27579689A JPH03139038A JP H03139038 A JPH03139038 A JP H03139038A JP 27579689 A JP27579689 A JP 27579689A JP 27579689 A JP27579689 A JP 27579689A JP H03139038 A JPH03139038 A JP H03139038A
Authority
JP
Japan
Prior art keywords
data
transmission
section
unit
carrier wave
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
Application number
JP27579689A
Other languages
Japanese (ja)
Inventor
Fumitaka Okamoto
文孝 岡本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP27579689A priority Critical patent/JPH03139038A/en
Publication of JPH03139038A publication Critical patent/JPH03139038A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To avoid the data collision at reproduction and to avoid collision even in a network where collision frequently takes place though tentatively by decreasing a data length at reproduction after a prescribed time when collision of transmission data takes place at data transmission in a bus type network. CONSTITUTION:When a data transmission control section 6 discriminates it from the information from a carrier monitor section 4 that no data exists in a transmission data storage section 7 and no carrier is detected from other equipment, the control section 6 gives a command of sending a data of the storage section 7 to a transmission line 1 to a data output section 3. On the other hand, when the monitor section 4 discriminates the occurrence of data collision during transmission, the section 6 gives a command to stop data transmission to the output section 3. Then the control section 6 commands it to the data division section 8 that the data in the storage section 7 is split and stored in a split data storage section 9 and discriminates that no carrier is detected from other equipment after lapse of a prescribed times based on the information from the timer monitor section 5 and gives a command to send the data in the storage section 9 to the output section 3.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発・明は、バス型ネットワークにおける再送データ長
決定方式に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a retransmission data length determination method in a bus type network.

〔従来の技術〕[Conventional technology]

従来、バス型ネットワークの通信方式として。 Traditionally, as a communication method for bus-type networks.

代表的なＣ８ＭＡ／ＣＤ方式においては、データ送信中
にデータの衝突を検出した場合には、−旦、送信を中止
し、所定の時刻後に、他の装置からの搬送波が検出され
なければ、送信データの長さを変えずに再送を行ってい
る。In the typical C8MA/CD system, if a data collision is detected during data transmission, transmission is stopped once, and if no carrier wave from another device is detected after a predetermined time, transmission is stopped. Retransmission is performed without changing the data length.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上述したＣ８ＭＡ／ＣＤ方式におＡでは、送信データの
衝突が発生して、所定の時刻後に送信データの長さを変
えずにデータの再送を行っているから。This is because in the C8MA/CD method A described above, a collision of transmitted data occurs and the data is retransmitted after a predetermined time without changing the length of the transmitted data.

再び送信データの衝突が発生する不可能が高いという問
題点がある。There is a problem in that it is highly unlikely that a collision of transmitted data will occur again.

本発明の目的は再送時に送信データが衝突することが少
ない再送データ長決定方式を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a retransmission data length determination method in which transmission data is less likely to collide during retransmission.

〔課題を解決するだめの手段〕[Failure to solve the problem]

本発明の適応型最適再送データ長決定方式は。 The adaptive optimal retransmission data length determination method of the present invention is as follows.

データ送信装置内に、送信データの格納を行う送信デー
タ格納部と、データ送信中にデータの衝突が発生した場
合に送信ｒ−夕の分割を行うデータ分割部と２分割され
た送信データの格納を行う分割ｒ−タ格納部と、常に他
のデータ送信装置からの搬送波の検出を行う搬送波監視
部と１時刻の監視を行うタイマ監視部と、上記搬送波監
査部からの情報より他のデータ送信装置からの搬送波の
検出されなかった場合には、上記送信データ格納部のデ
〜りを送信するデータ出力部と、上記データ出力部に送
信の指示を行い、データ送信中に上記搬送波監査部から
の情報よりデータの衝突の発生を検出した場合には、上
記データ出力部に対して。The data transmitting device includes a transmission data storage unit that stores transmission data, a data division unit that divides the transmission data when a data collision occurs during data transmission, and a storage unit that stores the divided transmission data. A divided r-data storage section that performs the above-mentioned data transmission, a carrier monitoring section that always detects carrier waves from other data transmitting devices, a timer monitoring section that monitors one time, and a transmission of other data based on the information from the carrier inspection section. If the carrier wave from the device is not detected, the data output unit that transmits the data in the transmission data storage unit and the data output unit are instructed to transmit, and during data transmission, the carrier wave inspection unit If the occurrence of a data collision is detected based on the information, the information is sent to the data output unit.

データの送信の中止を指示し、一方上記データ分割部に
対して送信データの分割を指示して、上記タイマ監視部
の情報によシ所定の時刻後に、上記搬送波監査部からの
情報より他のデータ送信装置からの搬送波の検出されな
かった場合には、上記分割データ格納部のデータを上記
データ出力部に再送を行うことを指示するデータ送信制
御部とを有することを特徴としている。It instructs the data division section to stop transmitting the data, and also instructs the data division section to divide the transmission data, and after a predetermined time, the information from the carrier inspection section The present invention is characterized by comprising a data transmission control section that instructs to retransmit the data in the divided data storage section to the data output section when a carrier wave from the data transmission device is not detected.

〔実施例〕〔Example〕

以下２本発明について実施例によって説明する。 Two examples of the present invention will be explained below.

第１図を参照して２本発明では、伝送路１．データ送信
装置２，７′−タ出力部３．搬送波監視部４、タイマ監
視部５．データ送信制御部６．送信データ格納部７．デ
ータ分割部８及び分割データ格納部９が備えられている
。Referring to FIG. 1, in the present invention, two transmission lines 1. Data transmitting device 2, 7'-data output section 3. Carrier wave monitoring section 4, timer monitoring section 5. Data transmission control unit 6. Transmission data storage unit 7. A data dividing section 8 and a divided data storage section 9 are provided.

データ送信制御部６は、送信データ格納部７にデータが
存在し、他の装置からの搬送波が検出されないことを、
搬送監視部４からの情報より判断した時には、送信ｒ−
タ格納部７のデータを伝送路１に送信することをデータ
出力部３に指示する。The data transmission control unit 6 determines that data exists in the transmission data storage unit 7 and that carrier waves from other devices are not detected.
When judged from the information from the transport monitoring unit 4, the transmission r-
The data output unit 3 is instructed to transmit the data in the data storage unit 7 to the transmission line 1.

一方、データ送信中にデータの衝突が発生したことを搬
送波監視部４からの情報より判断した場合には、データ
を送信を中止することをデータ出力部３に指示する。On the other hand, if it is determined from the information from the carrier wave monitoring section 4 that a data collision has occurred during data transmission, the data output section 3 is instructed to stop transmitting the data.

その後、データ送信制御部６はデータ分割部８に対して
送信データ格納部７のデータを分割して。Thereafter, the data transmission control section 6 divides the data in the transmission data storage section 7 to the data division section 8 .

分割データ格納部９に格納することを指示し、タイマ監
視部５からの情報よシ所定の時刻後に他の装置からの搬
送波が検出されないことを、搬送監視部４かもの情報よ
シ判断した時には２分割データ格納部９のデータを伝送
路ｌに送信することをデータ出力部３に指示する。When the carrier monitoring unit 4 determines that the carrier wave from another device will not be detected after a predetermined time based on the information from the timer monitoring unit 5, The data output unit 3 is instructed to transmit the data in the two-part data storage unit 9 to the transmission path l.

〔発明の効果〕〔Effect of the invention〕

以上説明したように９本発明では、バス型ネットワーク
におけるデータ送信において、送信データの衝突が発生
した場合に、所定の時刻後に行われるデータの再送の時
のデータ長を短くしているから再送時のデータの衝突を
回避する事が可能番てなる。この結果、ある時刻に一時
的にではあるが。As explained above, in the present invention, when a collision of transmitted data occurs during data transmission in a bus type network, the data length is shortened when data is retransmitted after a predetermined time. This makes it possible to avoid data collisions. As a result, at a certain time, albeit temporarily.

頻繁に送信データの衝突が起こる様なネットワークにお
いても伝送路を有効利用できる。Transmission paths can be used effectively even in networks where transmission data collisions occur frequently.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例を示すブロック構成図である
。 １・・・伝送路、２・・・データ送信装置、３・・・デ
ータ出力部、４・・・搬送波監視部、５・・・タイマ監
視部。 ６・・・データ送信制御部、７・・・送信データ格納部
。 ８・・・データ分割部、９・・・分割データ格納部。FIG. 1 is a block diagram showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Transmission path, 2... Data transmission device, 3... Data output part, 4... Carrier wave monitoring part, 5... Timer monitoring part. 6... Data transmission control section, 7... Transmission data storage section. 8...Data division section, 9...Divided data storage section.

Claims (1)

【特許請求の範囲】[Claims] １、複数のデータ送信装置がネットワークに接続され、
送信データの転送を行うバス型のローカルエリアネット
ワークにおいて、前記各データ送信装置は前記送信デー
タの格納を行う送信データ格納部と、データ送信中にデ
ータの衝突が発生した場合に送信データの分割を行うデ
ータ分割部と、該分割された送信データの格納を行う分
割データ格納部と、他のデータ送信装置からの搬送波の
検出を行う搬送波監視部と、時刻の監視を行うタイマ監
視部と、前記搬送波監査部からの情報より他のデータ送
信装置からの搬送波の検出されなかった場合には、前記
送信データ格納部のデータを送信するデータ出力部と、
前記データ出力部に送信の指示を行い、データ送信中に
前記搬送波監査部からの情報よりデータの衝突の発生を
検出した場合には、前記データ出力部に対して、データ
の送信の中止を指示し、一方前記データ分割部に対して
送信データの分割を指示し、前記タイマ監視部の情報に
基づいて所定の時刻後に、前記搬送波監査部からの情報
より他のデータ送信装置からの搬送波が検出されなかっ
た場合には、前記分割データ格納部のデータを前記デー
タ出力部に再送を行うことを指示するデータ送信制御部
とが備えられていることを特徴とする再送データ長決定
方式。1. Multiple data transmitting devices are connected to a network,
In a bus-type local area network that transfers transmission data, each of the data transmission devices has a transmission data storage unit that stores the transmission data, and a transmission data storage unit that stores the transmission data and divides the transmission data when a data collision occurs during data transmission. a data dividing unit that performs the above-mentioned data division, a divided data storage unit that stores the divided transmission data, a carrier monitoring unit that detects a carrier wave from another data transmitting device, a timer monitoring unit that monitors the time, and a data output unit that transmits the data in the transmission data storage unit when a carrier wave from another data transmission device is not detected according to information from the carrier wave inspection unit;
Instructs the data output unit to transmit data, and if occurrence of data collision is detected based on information from the carrier wave inspection unit during data transmission, instructs the data output unit to stop transmitting data. On the other hand, the data division section is instructed to divide the transmission data, and after a predetermined time based on the information from the timer monitoring section, a carrier wave from another data transmission device is detected based on information from the carrier wave inspection section. and a data transmission control unit that instructs to retransmit the data in the divided data storage unit to the data output unit if the divided data storage unit is not transmitted.
JP27579689A 1989-10-25 1989-10-25 Retransmission data length deciding system Pending JPH03139038A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP27579689A JPH03139038A (en) 1989-10-25 1989-10-25 Retransmission data length deciding system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27579689A JPH03139038A (en) 1989-10-25 1989-10-25 Retransmission data length deciding system

Publications (1)

Publication Number Publication Date
JPH03139038A true JPH03139038A (en) 1991-06-13

Family

ID=17560537

Family Applications (1)

Application Number Title Priority Date Filing Date
JP27579689A Pending JPH03139038A (en) 1989-10-25 1989-10-25 Retransmission data length deciding system

Country Status (1)

Country Link
JP (1) JPH03139038A (en)

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