JP3395414B2 - Delivery confirmation method for broadcast transmission - Google Patents
Delivery confirmation method for broadcast transmissionInfo
- Publication number
- JP3395414B2 JP3395414B2 JP30328394A JP30328394A JP3395414B2 JP 3395414 B2 JP3395414 B2 JP 3395414B2 JP 30328394 A JP30328394 A JP 30328394A JP 30328394 A JP30328394 A JP 30328394A JP 3395414 B2 JP3395414 B2 JP 3395414B2
- Authority
- JP
- Japan
- Prior art keywords
- data
- station
- received
- acknowledgment
- transmitting
- 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.)
- Expired - Lifetime
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- Communication Control (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、ローカルエリアネット
ワーク（ＬＡＮ）の同報伝送方式に係り、特にブロード
キャスト伝送の送達確認方式に関する。
【０００２】
【従来の技術】複数局から構成されるネットワークにお
いて、１局から他の全部の局へデータを送信する場合、
ブロードキャスト（一斉同報）伝送が使用される。ま
た、相手局へデータが届いたことを確認するためには、
１局毎に順番に個別伝送を行って、送達確認をとらなけ
ればならない。
【０００３】伝送路上の親局から他の全部の子局にデー
タを送信して、且つそのデータが子局である相手局全部
に届いたことを確認したい場合、一般的には、図５に示
すように、データ送信局１がブロードキャスト伝送によ
りデータ受信局２，３，４にデータ信号Ｓ０のデータ送
信を行う。そのデータを受信した局２，３，４は個別伝
送で送達確認（ＡＣＫ）信号ＡＣＫ２，ＡＣＫ３，ＡＣ
Ｋ４を局１に送信する。局１は全局から送達確認が応答
されたことにより伝送が成功したと判断する。ここで、
もし送達確認信号ＡＣＫ２，ＡＣＫ３，ＡＣＫ４のいず
れかを局１が正しく受信できない場合、局１はタイムア
ウトを検出して、データの再送を行う。局２，３，４
は、再送データを既に受信しているならば、再度の再送
データを受信するとそれを捨て、送達確認信号だけを局
１に送信することになる。以上の処理を局１は、全局か
ら送達確認を受信するまで、又は再送回数に達するまで
続ける。
【０００４】
【発明が解決しようとする課題】伝送路上の局数が少な
い場合は上記の方法でも問題ないが、局数が多い場合
は、局１が送達確認を全局から集中して受信することに
なるので、負荷率が高くなり、送達確認を取りこぼす可
能性が高くなる。従って、局１は何回もデータの再送を
行うことになり効率的に劣っていた。
【０００５】本発明は上述の問題点に鑑みてなされたも
ので、その目的は伝送路に接続されている局数が多い場
合でも、送達確認を効率的に送・受信できるブロードキ
ャスト伝送の送達確認方式を提供することである。
【０００６】
【課題を解決するための手段】上記目的を達成するため
に、本発明のブロードキャスト伝送の送達確認方法は、
データ送信局からデータ受信局にブロードキャストでデ
ータを送信するとともに、データ受信局はデータが送達
されたことを確認する送達確認信号を個別伝送でデータ
送信局に送信する送達確認方式において、前記データ送
信局が送信したデータに対し、受信局から送信局へ送ら
れる送達確認信号を送信局が受信済みであるかを判断す
る送達確認受信済み情報を用意し、前記データ送信局は
前記データ受信局から送達確認信号を受信すると送達確
認受信済み情報に受信した局の受信済み情報をセット
し、データの再送制限の範囲内においては全局よりの送
達確認信号受信が完了するまで前記送達確認受信済み情
報を付加したデータの再送を行うと共に、前記データ受
信局は、前記データ送信局から送られたデータが受信済
みであるか判別し、受信済みではない場合はデータの受
信を行うと共に送達確認信号を前記データ送信局に送信
し、データが受信済みである場合は受信データを取り込
まず、データが受信済みであり且つ前記送達確認受信済
み情報に自局の受信済み情報がセットされているときは
再度の送達確認信号を前記データ送信局に送信せず、デ
ータが受信済みであり且つ前記送達確認済み情報に自局
の受信済み情報がセットされていないときは送達確認信
号を前記データ送信局に送信することを特徴とする。
【０００７】
【作用】ブロードキャスト伝送で送達確認をとる伝送方
式において、データ送信局は、データをブロードキャス
トで送信する。データ受信局は送達確認を個別伝送でデ
ータ送信局に送信する。データ再送時、送達確認受信済
み情報を付加する。再送データ受信局は、その中の送達
確認受信済み情報に自局の送達確認をすでに受信してい
るということがわかったら、送達確認を送信しない。同
様に、送達確認受信済み情報に自局の受信済み情報がセ
ットされていない局は送達確認を送信する。データ送信
局は、全部の局から送達確認が揃うまでデータ再送をく
り返す。
【０００８】
【実施例】以下に本発明の実施例を図１〜図４を参照し
ながら説明する。
【０００９】図１〜図２は本発明の一実施例による送達
確認方式の模式図である。図１と図２において図５のも
のと同一又は相当部材には同一符号が付されている。図
２に示すように、データ送信局１からの送信データＳ１
の送信に対してデータ受信局２，３，４が送達確認信号
ＡＣＫ２，ＡＣＫ３，ＡＣＫ４をデータ送信局１に送信
するが、データ受信局４の送達確認信号ＡＣＫ４がデー
タ送信局１に届かなかった場合は、図１に示すように、
局１はデータＳＤの再送を行う。このとき、局２，３か
らの送達確認信号ＡＣＫ２，ＡＣＫ３をすでに受信して
いるという情報ＡＣＫ５を付加する。これを確認した局
２，３は自局の送達確認信号が局１に届いていることが
わかったので、送達確認をしない。局４は自局の送達確
認信号ＡＣＫ４が局１に届いていないことがわかったの
で、送達確認信号ＡＣＫ６を局１に送信する。
【００１０】図３にデータ送信局１の動作を、図４にデ
ータ受信局２，３，４の動作をフローチャートで示す。
図３は局１のデータ送信処理動作のフローチャートであ
る。図３に示すように、局１の送信にあたって、ステッ
プＳ１で送達確認ＡＣＫフラグを全局分クリアし、ステ
ップＳ２に進み再送カウンタをゼロにする。ステップＳ
３でタイムアウトタイマを起動し、ステップＳ４に進み
データを送信する。このときＡＣＫフラグはすべてゼロ
である。ステップＳ５に進みタイムアウトか否かを判断
する。ステップＳ５でタイムアウトしておれば、ステッ
プＳ７に進み再送カウンタをインクリメントし、ステッ
プＳ８に進む。ステップＳ８では再送カウンタがアップ
しているか否かを判断し、アップしていなければステッ
プＳ９に進み、タイムアウトタイマを起動して、ステッ
プＳ１０に進む。ステップＳ１０でデータ再送を行う。
このとき送達確認ＡＣＫフラグを付加する。ステップＳ
８で再送カウンタがアップしておればエラー処理を実行
する。
【００１１】ステップＳ５でタイムアウトしていなけれ
ばステップＳ６に進みＡＣＫを受信していればステップ
１２に進みその局のＡＣＫフラグをインクリメントして
ステップＳ１３に進む。ステップ１３では全局がデータ
を受信したかどうかを判断し、受信しておればステップ
Ｓ１４に進み完了処理となる。
【００１２】図４は局２，３，４のデータ受信処理動作
を示すもので、例えば局２のデータ受信処理を示す。局
２がデータを受信すると、ステップＳ１５で受信済みデ
ータか否かを判断し、受信済みデータでなければステッ
プＳ１６に進み、受信データをセーブする。次にステッ
プＳ１７に進み、送達確認（ＡＣＫ）信号を送信する。
ステップＳ１５で、局１からの受信済みデータであれ
ば、ステップＳ１８に進み自局の送達確認信号ＡＣＫの
フラグが「１」であるかどうかを判断する。フラグが
「１」であれば動作を終了し、フラグが「１」でなけれ
ばステップＳ１７に進む。
【００１３】前述のように、局１が全部の局からの送達
確認を受信できないと、再送処理を行うことになり、他
局は再び送達確認を局１に送信する。局１の送達確認受
信処理の負荷を減らすためには、再送データを受信した
局が送達確認を送らなければ良いことになる。但し、送
達確認が局１に正しく届いたことが確認できていなけれ
ば送信効率が低下する。そこで、局１がデータを送信す
る時に、すでに送達確認を受信した局番号を付加する。
【００１４】
【発明の効果】本発明は、以上の如くであって、データ
送信局はデータ再送時に送達確認受信済み情報を付加
し、データ受信局は、前記送達確認受信済み情報がセッ
トされているときは再度の送達確認を前記データ送信局
に送信せず、前記送達確認済み情報に自局の受信済み情
報がセットされていないときは送達確認を前記データ送
信局に送信するものであるから、伝送路に接続されてい
る局数が多い場合でも、無駄な送達確認の送受信処理を
行う必要がなく、送達確認を効率的に送受信できる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a broadcast transmission system for a local area network (LAN), and more particularly to a delivery confirmation system for broadcast transmission. [0002] In a network composed of a plurality of stations, when data is transmitted from one station to all other stations,
Broadcast transmission is used. Also, to confirm that the data has arrived at the partner station,
Individual transmission must be performed in order for each station to confirm delivery. [0003] When data is transmitted from a master station on a transmission path to all other slave stations and it is desired to confirm that the data has reached all the partner stations as slave stations, generally, as shown in FIG. As shown, the data transmitting station 1 performs data transmission of the data signal S0 to the data receiving stations 2, 3, and 4 by broadcast transmission. The stations 2, 3, and 4 receiving the data transmit the acknowledgment (ACK) signals ACK2, ACK3, and AC in the individual transmission.
K4 is transmitted to the station 1. The station 1 determines that the transmission has been successful because the acknowledgments have been returned from all the stations. here,
If the station 1 cannot correctly receive any of the acknowledgment signals ACK2, ACK3, and ACK4, the station 1 detects a timeout and retransmits data. Stations 2, 3, 4
Means that if retransmission data has already been received, when retransmission data is received again, it is discarded and only an acknowledgment signal is transmitted to the station 1. The above-described processing is continued until the station 1 receives the acknowledgment from all the stations or until the number of retransmissions is reached. [0004] When the number of stations on the transmission line is small, the above method does not pose any problem. However, when the number of stations is large, the station 1 must collectively receive delivery confirmations from all stations. , The load factor increases, and the possibility of missing the delivery confirmation increases. Therefore, the station 1 retransmits data many times, which is inefficient. SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and has as its object to provide broadcast transmission acknowledgment capable of efficiently transmitting and receiving acknowledgments even when the number of stations connected to a transmission line is large. Is to provide a scheme. [0006] In order to achieve the above object, a delivery confirmation method for broadcast transmission according to the present invention comprises:
Transmits the data broadcast data receiving station from the data transmission station, the data receiving station in the delivery confirmation system for transmitting the acknowledgment signal confirming that the data has been delivered to the data transmission station in a separate transmission, transmission the data
Send data from the receiving station to the transmitting station for the data transmitted by the transmitting station
Determine whether the transmitting station has received the acknowledgment signal
Preparing the delivery confirmation received information,
When a delivery confirmation signal is received from the data receiving station, delivery confirmation is received.
Set the received information of the receiving station to the received information
However, within the limits of data retransmission,
The acknowledgment received information is received until the acknowledgment signal is received.
The data receiving station retransmits the data to which the data has been added, and the data receiving station has received the data transmitted from the data transmitting station.
Is received, and if not received,
And sends an acknowledgment signal to the data transmitting station.
And if the data has already been received,
First, without transmitting the acknowledgment signal back to the data transmitting station when the data is received information of its own station received a is and the acknowledgment received information is set, de
Acknowledgment signal when over data is received information of its own station received a is and the acknowledgment completion information is not set
And transmitting a signal to the data transmitting station. In the transmission method for confirming the delivery by broadcast transmission, the data transmitting station transmits data by broadcast. The data receiving station transmits the acknowledgment to the data transmitting station by individual transmission. At the time of data retransmission, the acknowledgment received information is added. The retransmission data receiving station does not transmit the acknowledgment if the acknowledgment received information in the retransmission data receiving station indicates that the acknowledgment has already been received. Similarly, a station whose own information has not been set in the acknowledgment received information transmits an acknowledgment. The data transmitting station repeats data retransmission until all stations have confirmed delivery. An embodiment of the present invention will be described below with reference to FIGS. FIGS. 1 and 2 are schematic diagrams of a delivery confirmation system according to an embodiment of the present invention. 1 and 2, the same or equivalent members as those in FIG. 5 are denoted by the same reference numerals. As shown in FIG. 2, the transmission data S1 from the data transmission station 1
, The data receiving stations 2, 3, and 4 transmit acknowledgment signals ACK2, ACK3, and ACK4 to the data transmitting station 1, but the acknowledgment signal ACK4 of the data receiving station 4 did not reach the data transmitting station 1. In that case, as shown in FIG.
The station 1 retransmits the data SD. At this time, information ACK5 indicating that the acknowledgment signals ACK2 and ACK3 from the stations 2 and 3 have already been received is added. After confirming this, the stations 2 and 3 do not confirm the delivery because they have found that the delivery confirmation signal of their own station has reached the station 1. The station 4 transmits the acknowledgment signal ACK6 to the station 1 because it has been found that the acknowledgment signal ACK4 of the station 4 has not reached the station 1. FIG. 3 is a flowchart showing the operation of the data transmitting station 1, and FIG. 4 is a flowchart showing the operation of the data receiving stations 2, 3, and 4.
FIG. 3 is a flowchart of the data transmission processing operation of the station 1. As shown in FIG. 3, upon transmission by the station 1, in step S1, the acknowledgment ACK flags are cleared for all stations, and the process proceeds to step S2, where the retransmission counter is set to zero. Step S
In step 3, a timeout timer is started, and the process proceeds to step S4 to transmit data. At this time, the ACK flags are all zero. Proceeding to step S5, it is determined whether a timeout has occurred. If a timeout has occurred in step S5, the flow proceeds to step S7, where the retransmission counter is incremented, and the flow proceeds to step S8. In step S8, it is determined whether or not the retransmission counter is up. If it is not up, the process proceeds to step S9, a time-out timer is started, and the process proceeds to step S10. In step S10, data retransmission is performed.
At this time, a delivery confirmation ACK flag is added. Step S
If the retransmission counter is up in step 8, error processing is executed. If the timeout has not occurred in step S5, the process proceeds to step S6, and if the ACK has been received , the process proceeds to step 12, the ACK flag of the station is incremented, and the process proceeds to step S13. In step 13, it is determined whether or not all the stations have received the data. If the data has been received, the process proceeds to step S14 to complete the process. FIG. 4 shows the data reception processing operation of the stations 2, 3, and 4, for example, the data reception processing of the station 2. When the station 2 receives the data, it determines in step S15 whether or not the data is already received. If not, the process proceeds to step S16 to save the received data. Next, the process proceeds to step S17, where an acknowledgment (ACK) signal is transmitted.
If it is determined in step S15 that the data has been received from the station 1, the flow advances to step S18 to determine whether or not the flag of the acknowledgment signal ACK of the own station is "1". If the flag is "1", the operation is terminated, and if the flag is not "1", the process proceeds to step S17. As described above, when the station 1 cannot receive the acknowledgments from all the stations, it performs retransmission processing, and the other stations transmit the acknowledgments to the station 1 again. In order to reduce the load of the acknowledgment receiving process of the station 1, it is sufficient that the station that has received the retransmission data does not send the acknowledgment. However, if it is not confirmed that the acknowledgment has arrived correctly at the station 1, the transmission efficiency is reduced. Therefore, when the station 1 transmits data, the station number that has already received the delivery confirmation is added. According to the present invention, as described above, the data transmitting station adds the acknowledgment received information at the time of data retransmission, and the data receiving station sets the acknowledgment received information. Is not transmitted again to the data transmitting station when it is present, and when the received information of the own station is not set in the transmission confirmed information, the transmission confirmation is transmitted to the data transmitting station. Even when the number of stations connected to the transmission path is large, there is no need to perform useless transmission confirmation transmission / reception processing, and transmission confirmation can be transmitted / received efficiently.
【図面の簡単な説明】
【図１】本発明の実施例によるブロードキャスト伝送の
送達確認方式を示すブロック図。
【図２】本発明の実施例によるブロードキャスト伝送の
送達確認方式を示すブロック図。
【図３】本発明の実施例によるブロードキャスト伝送の
送達確認方式におけるデータ送信局のデータ送信処理フ
ローチャート。
【図４】本発明の実施例によるブロードキャスト伝送の
送達確認方式におけるデータ受信局のデータ受信処理フ
ロー図。
【図５】従来のブロードキャスト伝送方式を示すブロッ
ク図。
【符号の説明】
１…データ送信局
２，３，４…データ受信局BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a delivery confirmation method of broadcast transmission according to an embodiment of the present invention. FIG. 2 is a block diagram showing a delivery confirmation method for broadcast transmission according to an embodiment of the present invention. FIG. 3 is a data transmission processing flowchart of a data transmission station in a delivery confirmation method of broadcast transmission according to an embodiment of the present invention. FIG. 4 is a data reception processing flow chart of a data receiving station in a delivery confirmation method of broadcast transmission according to an embodiment of the present invention. FIG. 5 is a block diagram showing a conventional broadcast transmission system. [Explanation of Signs] 1 ... Data transmitting station 2, 3, 4 ... Data receiving station
Claims (1)
ドキャストでデータを送信するとともに、データ受信局
はデータが送達されたことを確認する送達確認信号を個
別伝送でデータ送信局に送信する送達確認方式におい
て、前記データ送信局が送信したデータに対し、受信局から
送信局へ送られる送達確認信号を送信局が受信済みであ
るかを判断する送達確認受信済み情報を用意し、 前記デ
ータ送信局は前記データ受信局から送達確認信号を受信
すると送達確認受信済み情報に受信した局の受信済み情
報をセットし、データの再送制限の範囲内においては全
局よりの送達確認信号受信が完了するまで前記送達確認
受信済み情報を付加したデータの再送を行うと共に、 前記データ受信局は、前記データ送信局から送られたデ
ータが受信済みであるか判別し、受信済みではない場合
はデータの受信を行うと共に送達確認信号を前記データ
送信局に送信し、データが受信済みである場合は受信デ
ータを取り込まず、データが受信済みであり且つ前記送
達確認受信済み情報に自局の受信済み情報がセットされ
ているときは再度の送達確認信号を前記データ送信局に
送信せず、データが受信済みであり且つ前記送達確認済
み情報に自局の受信済み情報がセットされていないとき
は送達確認信号を前記データ送信局に送信することを特
徴とするブロードキャスト伝送の送達確認方式。(57) [Claims] [Claim 1] While transmitting data by broadcast from a data transmitting station to a data receiving station, the data receiving station transmits an acknowledgment signal for confirming that the data has been transmitted by individual transmission. In the delivery confirmation method for transmitting to the data transmitting station, the data transmitted by the data transmitting station is
If the transmitting station has already received the acknowledgment signal sent to the transmitting station,
Prepare the acknowledgment received information to determine whether or not, the data transmitting station receives an acknowledgment signal from the data receiving station
Then, the received information of the receiving station is displayed in the delivery confirmation received information.
Information within the limit of data retransmission.
Until the reception of the acknowledgment signal from the station is completed.
While retransmitting the data to which the received information has been added, the data receiving station transmits the data transmitted from the data transmitting station.
Data has been received and if not
Performs data reception and sends an acknowledgment signal to the data
Transmit to the transmitting station, and if data has been received,
Data is received, and when the received information of the own station is set in the received acknowledgment received information , the acknowledgment signal is not transmitted again to the data transmitting station, and the data is received. broadcast transmission acknowledgment scheme, wherein transmitting the acknowledgment signal to said data transmission stations when received information received in and and mobile station, to the acknowledgment completion information is not set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30328394A JP3395414B2 (en) | 1994-12-07 | 1994-12-07 | Delivery confirmation method for broadcast transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30328394A JP3395414B2 (en) | 1994-12-07 | 1994-12-07 | Delivery confirmation method for broadcast transmission |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08163128A JPH08163128A (en) | 1996-06-21 |
| JP3395414B2 true JP3395414B2 (en) | 2003-04-14 |
Family
ID=17919099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30328394A Expired - Lifetime JP3395414B2 (en) | 1994-12-07 | 1994-12-07 | Delivery confirmation method for broadcast transmission |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3395414B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9379852B2 (en) | 2006-09-05 | 2016-06-28 | Nec Corporation | Packet recovery method, communication system, information processing device, and program |
| JP5057304B2 (en) | 2007-06-08 | 2012-10-24 | 国立大学法人名古屋大学 | In-vehicle communication system and in-vehicle communication method |
| JP2009253382A (en) | 2008-04-01 | 2009-10-29 | Canon Inc | Terminal station, method, program, and system thereof |
| JP5185024B2 (en) | 2008-08-28 | 2013-04-17 | キヤノン株式会社 | Communication system, its dependent stations, and relay transmission method |
| JP5322773B2 (en) * | 2009-05-25 | 2013-10-23 | キヤノン株式会社 | Communication system and communication control method |
-
1994
- 1994-12-07 JP JP30328394A patent/JP3395414B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08163128A (en) | 1996-06-21 |
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