JPH0832531A - Multiple address communication system - Google Patents
Multiple address communication systemInfo
- Publication number
- JPH0832531A JPH0832531A JP16766494A JP16766494A JPH0832531A JP H0832531 A JPH0832531 A JP H0832531A JP 16766494 A JP16766494 A JP 16766494A JP 16766494 A JP16766494 A JP 16766494A JP H0832531 A JPH0832531 A JP H0832531A
- Authority
- JP
- Japan
- Prior art keywords
- sequence number
- information
- transmission
- station
- reception
- 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
Landscapes
- Radio Relay Systems (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、通信衛星を介して、映
像，データなどの情報を親局から複数の子局に放送モー
ドで同時に伝送する、いわゆる同報通信システムに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called broadcast communication system for simultaneously transmitting information such as video and data from a master station to a plurality of slave stations in a broadcast mode via a communication satellite.
【０００２】[0002]
【従来の技術】複数の宛先に同一の内容の情報を同時に
転送する通信を同報通信と呼ぶ。この同報通信におい
て、情報の転送が確実に行われるためには、複数の宛先
に情報が転送されたか否かの送達確認の手段が重要であ
る。従来、例えば特開平１−１９４６１７号公報「衛星
同報通信方式」においては、同報通信完了後受信局は予
め定められたタイミングにて順次応答信号を送信局に送
信し、送信局は該応答信号を全受信局より受信し送達確
認を行う。2. Description of the Related Art Communication in which information of the same content is simultaneously transferred to a plurality of destinations is called broadcast communication. In this broadcast communication, in order to reliably transfer the information, it is important to confirm the delivery of the information to the plurality of destinations. Conventionally, for example, in JP-A-1-194617, "Satellite Broadcast Communication System", after completion of the broadcast communication, the receiving station sequentially transmits response signals to the transmitting station at a predetermined timing, and the transmitting station sends the response. Receive signals from all receiving stations and confirm delivery.
【０００３】[0003]
【発明が解決しようとする課題】前記従来の技術におい
て、全局より応答信号を受信するために受信局が多数に
なった場合に１回の同報通信の送達確認に時間がかか
る、また送信局が扱う制御情報の量が増大し、再送の制
御も複雑になる等の問題があった。In the above-mentioned conventional technique, it takes a long time to confirm the delivery of one broadcast communication when the number of receiving stations becomes large in order to receive the response signals from all the stations, and the sending station However, there is a problem that the amount of control information handled by (1) increases and the control of retransmission becomes complicated.
【０００４】本発明はこの問題を解決し、短時間かつ簡
単に同報通信の送達確認を行える手段を提供することを
目的としている。An object of the present invention is to solve this problem and to provide means for confirming delivery of broadcast communication in a short time and easily.
【０００５】[0005]
【課題を解決するための手段】送信局は、同一の情報を
複数の受信局に向けて送信する場合、送信する情報のシ
ーケンス番号を情報に付加して送信し、また最後に送信
した情報のシーケンス番号を周期的に送信し続けるよう
にする。受信局は、受信した情報に付加された情報のシ
ーケンス番号と、周期的に受信するシーケンス番号が不
一致である場合、送信局が送信した情報の受信に失敗し
たと判断し、送信局に再送の要求を行う。送信局は、該
再送の要求に従いシーケンス番号が付加された情報の再
送を行う。When transmitting the same information to a plurality of receiving stations, the transmitting station adds the sequence number of the information to be transmitted to the information and transmits the information. Make the sequence number continue to be transmitted periodically. If the sequence number of the information added to the received information and the sequence number that is periodically received do not match, the receiving station determines that the information transmitted by the transmitting station has failed to be received and resends it to the transmitting station. Make a request. The transmitting station retransmits the information to which the sequence number is added according to the request for retransmission.
【０００６】[0006]
【作用】受信に失敗した局のみが再送要求を行うだけな
ので、送信局は短時間に送達確認を行うことができ、ま
た送信局が扱う制御情報が少なくなり、制御も簡単に行
うことができる。さらに、回線の一時的な障害等により
シーケンス番号を受信失敗しても、シーケンス番号は周
期的に送信されているので同報された情報の受信失敗を
検出でき、シーケンス番号の送信周期及び送信局におけ
る送信した情報を保存する時間を適切に定めれば情報の
転送を確実に行うことができる。Since only the station that has failed to receive the request issues the retransmission request, the transmitting station can confirm the delivery in a short time, the control information handled by the transmitting station is small, and the control can be easily performed. . Further, even if the sequence number is unsuccessfully received due to a temporary failure of the line or the like, the sequence number is transmitted periodically, so that the failure of receiving the broadcast information can be detected. If the time for saving the transmitted information is properly set, the information can be transferred reliably.
【０００７】また、再送する情報にもシーケンス番号が
付加されているので、受信局は受信した情報の重複を避
けることができる。Further, since the sequence number is added to the information to be retransmitted, the receiving station can avoid duplication of the received information.
【０００８】[0008]
【実施例】以下本発明の実施例を図を用いて詳細に説明
する。図１は本発明による同報通信の送信局の基本構成
図である。図中１−１は送信バッファ、１−２は受信バ
ッファ、１−３は送信される情報のシーケンス番号カウ
ンタ、１−４は情報の送受信を制御するＣＰＵ、そして
１−５は通信回線との情報の送受信を行う送受信装置を
示す。送信局は、送信バッファ内の情報を複数の受信局
に送信する場合、送信シーケンス番号カウンタをインク
リメントし送信バッファ内の情報に付加し、送受信装置
経由で通信回線に送信する。さらに、送信局は送信シー
ケンス番号カウンタの値を周期的に全受信局に送信す
る。また、送信局が通信回線より送受信装置経由で受信
した情報は受信バッファに格納される。送信局は再送要
求を受信した場合、シーケンス番号が付加されている送
信バッファ内の情報の再送を行う。Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a basic configuration diagram of a transmitting station for broadcast communication according to the present invention. In the figure, 1-1 is a transmission buffer, 1-2 is a reception buffer, 1-3 is a sequence number counter of information to be transmitted, 1-4 is a CPU for controlling transmission / reception of information, and 1-5 is a communication line. 1 shows a transmitting / receiving device that transmits and receives information. When transmitting the information in the transmission buffer to a plurality of receiving stations, the transmitting station increments the transmission sequence number counter, adds it to the information in the transmitting buffer, and transmits it to the communication line via the transmitting / receiving device. Further, the transmitting station periodically transmits the value of the transmission sequence number counter to all receiving stations. Further, the information received by the transmitting station from the communication line via the transmitting / receiving device is stored in the receiving buffer. Upon receiving the retransmission request, the transmitting station retransmits the information in the transmission buffer to which the sequence number is added.
【０００９】図２は本発明による同報通信の受信局の基
本構成図である。図中２−１は送信バッファ、２−２は
受信バッファ、２−３は受信した情報のシーケンス番号
カウンタ、２−４は情報の送受信を制御するＣＰＵ、そ
して２−５は通信回線との情報の送受信を行う送受信装
置を示す。受信局が通信回線より送受信装置経由で受信
した情報は受信バッファに格納される。受信局は情報を
受信した場合、情報に付加されているシーケンス番号を
受信シーケンス番号カウンタに格納する。また、周期的
に送信されるシーケンス番号を受信した場合、受信シー
ケンス番号カウンタの値と比較を行い、異なっていた場
合、最後に情報を受信してからその時点までに送られた
情報の受信に失敗したと判断し、受信シーケンス番号を
付加した再送要求を送信バッファに作成し、送受信装置
経由で送信局に送信する。また、受信局が同一のシーケ
ンス番号を持つ情報を受信した場合は破棄する。FIG. 2 is a basic configuration diagram of a receiving station for broadcast communication according to the present invention. In the figure, 2-1 is a transmission buffer, 2-2 is a reception buffer, 2-3 is a sequence number counter of received information, 2-4 is a CPU that controls transmission / reception of information, and 2-5 is information with a communication line. 2 shows a transmission / reception device that transmits and receives. The information received by the receiving station from the communication line via the transmitting / receiving device is stored in the receiving buffer. When the receiving station receives the information, it stores the sequence number added to the information in the received sequence number counter. Also, when the sequence number sent periodically is received, it is compared with the value of the received sequence number counter, and if it is different, the information sent from the time when the last information was received until that point is received. It is determined that the transmission has failed, a retransmission request to which the reception sequence number is added is created in the transmission buffer, and is transmitted to the transmission station via the transmission / reception device. If the receiving station receives information having the same sequence number, it discards it.
【００１０】次に図３を用いてシステムの動作を説明す
る。同報通信の送信局は周期ｔにてシーケンス番号を送
信している。送信局が受信局１〜ｎへ情報＋シーケンス
番号を送信し、受信局２に該情報＋シーケンス番号が届
かなかった場合、この時点では受信局２は情報の受信失
敗を検出できない。その後、周期的に送信されているシ
ーケンス番号を受信局２が受信した時点で、受信局２は
シーケンス番号の不一致より情報の受信失敗を検出し送
信局に対し再送要求を行う。送信局は該情報＋シーケン
ス番号を再送するので受信局２は抜けなく情報＋シーケ
ンス番号を受信することができる。その他の受信局は、
再送された情報のシーケンス番号を調べ、前回受信した
情報のシーケンス番号と等しいので再送された情報を破
棄する。Next, the operation of the system will be described with reference to FIG. The transmitting station of the broadcast communication transmits the sequence number at the cycle t. When the transmitting station transmits the information + sequence number to the receiving stations 1 to n and the information + sequence number does not reach the receiving station 2, the receiving station 2 cannot detect the information reception failure at this point. After that, when the receiving station 2 receives the sequence number transmitted periodically, the receiving station 2 detects the information reception failure due to the mismatch of the sequence numbers and requests the transmitting station to resend. Since the transmitting station retransmits the information + sequence number, the receiving station 2 can receive the information + sequence number without omission. Other receiving stations,
The sequence number of the retransmitted information is checked. Since it is equal to the sequence number of the previously received information, the retransmitted information is discarded.
【００１１】さらに、図４を用いてシーケンス番号の送
信周期ｔの間に複数の情報が送信される場合の動作につ
いて説明する。同報通信の送信局は周期ｔにてシーケン
ス番号を送信している。送信局が受信局１〜ｎへ情報１
＋シーケンス番号１を送信し、受信局２に該情報１＋シ
ーケンス番号１が届かなかった場合、この時点で受信局
２は情報の受信失敗を検出できない。続けて送信局が受
信局１〜ｎへ情報２＋シーケンス番号２を送信し、受信
局２が該情報２＋シーケンス番号２を受信した時点で、
受信局２は受信したシーケンス番号が不連続になること
により情報の受信失敗を検出し送信局に対し再送要求を
行う。送信局は該情報１＋シーケンス番号１から再送を
行うので受信局２は抜けなく情報１＋シーケンス番号１
を受信することができる。全受信局は再送された情報の
シーケンス番号を調べ、前回受信した情報のシーケンス
番号と等しいシーケンス番号を持つ情報は破棄する。The operation when a plurality of pieces of information are transmitted during the transmission cycle t of the sequence number will be described with reference to FIG. The transmitting station of the broadcast communication transmits the sequence number at the cycle t. Information from transmitting station to receiving stations 1-n 1
When + sequence number 1 is transmitted and the information 1 + sequence number 1 does not reach the receiving station 2, the receiving station 2 cannot detect the information reception failure at this point. Subsequently, when the transmitting station transmits the information 2 + sequence number 2 to the receiving stations 1 to n, and the receiving station 2 receives the information 2 + sequence number 2,
The receiving station 2 detects the information reception failure because the received sequence numbers are discontinuous, and requests the transmitting station to resend. Since the transmitting station retransmits from the information 1 + sequence number 1, the receiving station 2 does not miss the information 1 + sequence number 1
Can be received. All receiving stations check the sequence number of the retransmitted information, and discard the information having the sequence number equal to the sequence number of the previously received information.
【００１２】[0012]
【発明の効果】以上説明した通り、本発明によれば短時
間かつ簡単な制御により同報通信における送達確認を行
うことができる。As described above, according to the present invention, delivery confirmation in broadcast communication can be performed in a short time and with simple control.
【図１】本発明による同報通信の送信局の基本構成図で
ある。FIG. 1 is a basic configuration diagram of a transmitting station for broadcast communication according to the present invention.
【図２】本発明による同報通信の受信局の基本構成図で
ある。FIG. 2 is a basic configuration diagram of a receiving station for broadcast communication according to the present invention.
【図３】本発明によるシステムの動作を示す図である。FIG. 3 shows the operation of the system according to the invention.
【図４】本発明による複数の情報が送信される場合のシ
ステムの動作を示す図である。FIG. 4 is a diagram showing an operation of the system when a plurality of information is transmitted according to the present invention.
１−１…送信バッファ、１−２…受信バッファ、１−３
…送信される情報のシーケンス番号カウンタ、１−４…
情報の送受信を制御するＣＰＵ、１−５…通信回路との
情報の送受信を行う送受信装置、２−１…送信バッフ
ァ、２−２…受信バッファ、２−３…受信した情報のシ
ーケンス番号カウンタ、２−４…情報の送受信を制御す
るＣＰＵ、２−５…通信回路との情報の送受信を行う送
受信装置。1-1 ... Transmission buffer, 1-2 ... Reception buffer, 1-3
... Sequence number counter of transmitted information, 1-4 ...
CPU for controlling transmission / reception of information, 1-5 ... Transmission / reception device for transmitting / receiving information to / from communication circuit, 2-1 ... Transmission buffer, 2-2 ... Reception buffer, 2-3 ... Sequence number counter of received information, 2-4 ... CPU for controlling transmission / reception of information, 2-5 ... Transmission / reception device for transmitting / receiving information to / from communication circuit.
Claims (1)
信する送信局と、送信された情報を受信できない場合再
送の要求を行う受信局からなる同報通信システムにおい
て、送信局は情報にシーケンス番号を付加して送信し、
また送信局は最後に送信した該シーケンス番号を周期的
に送信するようにし、受信局は受信した情報に付加され
たシーケンス番号と周期的に受信するシーケンス番号が
一致しない場合、情報の再送の要求を行うことを特徴と
する同報通信方式。1. A broadcasting communication system comprising a transmitting station which simultaneously transmits information having the same content to a plurality of destinations, and a receiving station which requests retransmission when the transmitted information cannot be received. Send with a sequence number added,
Also, the transmitting station should periodically transmit the last transmitted sequence number, and if the receiving station does not match the sequence number added to the received information with the sequence number to be periodically received, it requests to retransmit the information. A broadcast communication method characterized by performing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16766494A JPH0832531A (en) | 1994-07-20 | 1994-07-20 | Multiple address communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16766494A JPH0832531A (en) | 1994-07-20 | 1994-07-20 | Multiple address communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0832531A true JPH0832531A (en) | 1996-02-02 |
Family
ID=15853941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16766494A Pending JPH0832531A (en) | 1994-07-20 | 1994-07-20 | Multiple address communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0832531A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10210031A (en) * | 1997-01-22 | 1998-08-07 | Nippon Telegr & Teleph Corp <Ntt> | Packet communication equipment |
| WO2007148635A1 (en) * | 2006-06-20 | 2007-12-27 | Ntt Docomo, Inc. | Radio communication device and method used in mobile communication system |
| WO2011046056A1 (en) | 2009-10-14 | 2011-04-21 | 日本電気株式会社 | Transmission control method for packet communication and packet communication system |
| JP2015172963A (en) * | 2011-09-02 | 2015-10-01 | トレーディング テクノロジーズ インターナショナル インコーポレイテッド | message stream integrity |
-
1994
- 1994-07-20 JP JP16766494A patent/JPH0832531A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10210031A (en) * | 1997-01-22 | 1998-08-07 | Nippon Telegr & Teleph Corp <Ntt> | Packet communication equipment |
| WO2007148635A1 (en) * | 2006-06-20 | 2007-12-27 | Ntt Docomo, Inc. | Radio communication device and method used in mobile communication system |
| US8136004B2 (en) | 2006-06-20 | 2012-03-13 | Ntt Docomo, Inc. | Radio communication apparatus and method used in mobile communication system |
| WO2011046056A1 (en) | 2009-10-14 | 2011-04-21 | 日本電気株式会社 | Transmission control method for packet communication and packet communication system |
| JP2015172963A (en) * | 2011-09-02 | 2015-10-01 | トレーディング テクノロジーズ インターナショナル インコーポレイテッド | message stream integrity |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5432798A (en) | Data communication method and system | |
| US5619689A (en) | Method and apparatus for confirming delivery of files in a file broadcast system with rebroadcast timing at the receiver | |
| CN101009536B (en) | Status report method of automatic retransfer request | |
| JP2897711B2 (en) | Transmission control system | |
| CN101369879A (en) | Method and apparatus for requesting data retransmission | |
| KR100240645B1 (en) | Packet error controller of multicast communication and method thereof | |
| JP2000115051A (en) | Radio multicast data transfer method and radio communication system using same method | |
| JPH05219056A (en) | Multi-address communication system | |
| JPH0832531A (en) | Multiple address communication system | |
| US20040148422A1 (en) | Communication control method, communication system, and communication apparatus that can improve throughput | |
| JP3539606B2 (en) | Packet communication device | |
| KR100366018B1 (en) | Data transmission system and method for transmitting data frames | |
| JP3504491B2 (en) | Packet communication method | |
| JPH05252087A (en) | Communication system | |
| JPS62237835A (en) | Data communication control method | |
| US6986065B2 (en) | Distribution result verification method for information distribution system | |
| EP0993139B1 (en) | Go-back-N automatic-repeat-request protocol on virtual circuits | |
| JP4146569B2 (en) | Wireless communication method and wireless communication apparatus | |
| JP2001094588A (en) | Packet distribution system | |
| JP2001333048A (en) | Data transfer system | |
| JP2001028565A (en) | Broadcast communication method, broadcast communication system and mobile station | |
| JPH04124933A (en) | Sequential multi-address data verifying system | |
| JPH04273736A (en) | Packet communication system and packet re-transmission equipment | |
| JP3160831B2 (en) | Wireless communication method | |
| JPH0750880B2 (en) | Data packet transmission method |