JPH0567092B2 - - Google Patents
Info
- Publication number
- JPH0567092B2 JPH0567092B2 JP5092485A JP5092485A JPH0567092B2 JP H0567092 B2 JPH0567092 B2 JP H0567092B2 JP 5092485 A JP5092485 A JP 5092485A JP 5092485 A JP5092485 A JP 5092485A JP H0567092 B2 JPH0567092 B2 JP H0567092B2
- Authority
- JP
- Japan
- Prior art keywords
- broadcast communication
- transmitting station
- communication server
- receiving stations
- station
- 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
Links
- 238000004891 communication Methods 0.000 claims description 71
- 238000012790 confirmation Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Description
【発明の詳細な説明】
（産業上の利用分野）
各種情報提供サービス、会議通信などの通信形
態の多様化、通信網におけるデータベースの分散
化および衛星回線の利用などに伴い、同一内容の
情報を同時に複数の宛先に転送する同報形通信の
重要性が拡大してきている。本発明は上記同報形
通信を行う際の方式に関する。[Detailed Description of the Invention] (Industrial Application Field) With the diversification of communication forms such as various information provision services and conference communications, the decentralization of databases in communication networks, and the use of satellite lines, it is becoming increasingly difficult to share information with the same content. The importance of broadcast communication that simultaneously transfers data to multiple destinations is increasing. The present invention relates to a system for performing the above-mentioned broadcast type communication.
（従来技術とその問題点）
通信の相手が複数であり、同一内容の情報を同
時に複数の宛先に転送するような通信を同報形通
信と呼ぶ。従来同報形通信で再送制御を行なう場
合、受信局数が増すに従い１対１通信の場合と比
べて送信局が保持しなければならない制御情報の
量が増大し、また再送のための制御も複雑とな
る。すなわち送信局では、各受信局からの受信応
答から各受信局別の受信状況を把握し保持してい
る必要があり、また再送の重複を防ぐための処理
などが必要である。しかしこれから予想される同
報形通信の普及の必要性を考えると、特定の１、
２の局だけではなくどの局からも同報形通信が行
える、つまりどの局も同報形通信の送信局に成り
得ることが重要であると考えられる。従つて同報
形通信の送信局の負担を軽減することが必要であ
り、更に同報形通信も送信局においては１対１通
信とできるだけ同じ手順で行えることが望まし
い。(Prior art and its problems) Communication in which there are multiple communication partners and the same information is transferred to multiple destinations at the same time is called broadcast communication. Conventionally, when performing retransmission control in broadcast communication, as the number of receiving stations increases, the amount of control information that the transmitting station must hold increases compared to the case of one-to-one communication, and the control for retransmission also increases. It becomes complicated. That is, the transmitting station needs to grasp and maintain the reception status of each receiving station from the reception responses from each receiving station, and also requires processing to prevent duplication of retransmissions. However, considering the need for the spread of broadcast communication that is expected to occur in the future, there are certain
It is considered important that broadcast communication can be performed not only from the second station but also from any station, that is, any station can serve as a transmitting station for broadcast communication. Therefore, it is necessary to reduce the burden on the transmitting station of broadcast type communication, and it is also desirable that broadcast type communication can be performed at the transmitting station using the same procedure as one-to-one communication as much as possible.
（本発明の目的）
本発明の目的は、同報形通信システムにおい
て、送信局に代わつて複数の受信局からの受信応
答を受信して、必要な再送制御を行う特別な同報
通信サーバーを設けることにより、送信局は同報
形通信用に特別な機能を持つ必要性がなく通常の
１対１通信と同様に行うことができることを可能
にする同報通信方式を提供することである。(Objective of the present invention) An object of the present invention is to provide a special broadcast communication server that receives reception responses from a plurality of receiving stations on behalf of a transmitting station and performs necessary retransmission control in a broadcast communication system. It is an object of the present invention to provide a broadcast communication system in which the transmitting station does not need to have a special function for broadcast communication and can perform the same communication as normal one-to-one communication.
（発明の構成）
本発明によれば、同一内容の情報を同時に複数
の宛先に転送する同報通信を行う同報通信システ
ムにおいて、送信局と、複数の受信局と、送信局
から送られる情報フレームを受信し送信局に対し
て受信応答および再送要求を行う一方、複数の受
信局からの受信応答を受信し、送信局に代わつて
該複数受信局との間で再送制御を代行して行う特
別な同報通信サーバーとから成り、送信局は該同
報通信サーバーと該複数の受信局に対して情報フ
レームを送信し、該同報通信サーバーからの受信
応答だけに従つて再送制御を行い、該複数の受信
局は該送信局からの情報を直接受信すると共に該
同報通信サーバーに対して受信応答および再送要
求を行うことを特徴とする同報通信方式が得られ
る。(Structure of the Invention) According to the present invention, in a broadcast communication system that performs broadcast communication in which information of the same content is simultaneously transferred to a plurality of destinations, a transmitting station, a plurality of receiving stations, and information sent from the transmitting station are provided. While receiving a frame and making a reception response and retransmission request to the transmitting station, it also receives reception responses from multiple receiving stations and performs retransmission control with the multiple receiving stations on behalf of the transmitting station. A transmitting station transmits information frames to the broadcast communication server and the plurality of receiving stations, and performs retransmission control only according to reception responses from the broadcast communication server. , a broadcast communication system is obtained in which the plurality of receiving stations directly receive information from the transmitting station, and also make a reception response and a retransmission request to the broadcast communication server.
（構成の詳細な説明）
以下本発明の基本構成を図に用いて詳細に説明
する。第１図は本発明の基本構成図である。図中
１−１は送信局、１−２は本発明により導入され
る同報通信サーバー、１−３１〜１−３ｎは各々
受信局である。送信局から送信された情報フレー
ムは同報通信サーバー１−２および各受信局１−
３１〜１−３ｎによつて受信される。同報通信サ
ーバーは自分の受信状態に応じて受信応答を送信
局宛に送信する。他の各受信局は各々の受信状態
に応じて同報通信サーバー宛に受信応答を送信す
る。送信局はあたかも同報通信サーバーとの間で
１対１通信を行つているかのように、同報通信サ
ーバーからの受信応答だけを見て再送制御を行う
が、送信局から送信される情報フレームあるいは
再送フレームは全ての受信局で受信される。同報
通信サーバーは、送信局から受信した情報フレー
ムを、全ての受信局が該情報フレームを正常に受
信したことを確認するまでは蓄えておく。同報通
信サーバーは各受信局からの受信応答を受信し、
もし自局が概に正常に受信している情報フレーム
に対する再送要求を受け取つた時には、その情報
フレームを再送するなどの再送制御を行う。同報
通信サーバー自身が正常に受信していない情報フ
レームに対する再送要求は無視する。(Detailed Description of Configuration) The basic configuration of the present invention will be explained in detail below using the drawings. FIG. 1 is a basic configuration diagram of the present invention. In the figure, 1-1 is a transmitting station, 1-2 is a broadcast communication server introduced according to the present invention, and 1-31 to 1-3n are receiving stations. The information frame transmitted from the transmitting station is sent to the broadcast communication server 1-2 and each receiving station 1-
31 to 1-3n. The broadcast communication server transmits a reception response to the transmitting station according to its own reception status. Each of the other receiving stations transmits a reception response to the broadcast communication server according to its reception status. The transmitting station performs retransmission control by looking only at reception responses from the broadcast communication server, as if performing one-to-one communication with the broadcast communication server, but the information frame transmitted from the transmitting station Alternatively, the retransmitted frame is received by all receiving stations. The broadcast communication server stores information frames received from transmitting stations until it is confirmed that all receiving stations have received the information frames normally. The broadcast communication server receives reception responses from each receiving station,
If the own station receives a retransmission request for an information frame that is generally normally received, it performs retransmission control such as retransmitting the information frame. A retransmission request for an information frame that the broadcast communication server itself has not received normally will be ignored.
上述のように、本来なら全て送信局と複数の受
信局との間でで行われるべきやり取りを、あいだ
に同報通信サーバーを介することにより３つの部
分に分解して行う。送信局と各受信局とのあいだ
では送信局から送信された情報フレームを受信局
が受け取るという片方向だけのやり取りが行わ
れ、送信局と同報通信サーバーのあいだでは通常
の１対１通信と同じやり取りが行われる。同報通
信サーバーと各受信局のあいだでは、通常の同報
通信の送信局と受信局とのあいだで行われるべき
やり取りが行われる。 As described above, all communications that would normally be performed between a transmitting station and a plurality of receiving stations are broken down into three parts and performed via a broadcast communication server. Only one-way communication takes place between the transmitting station and each receiving station, with the receiving station receiving the information frame sent from the transmitting station, and normal one-to-one communication occurs between the transmitting station and the broadcast communication server. The same exchange takes place. Exchanges that would normally take place between a transmitting station and a receiving station in broadcast communication take place between the broadcast communication server and each receiving station.
（実施例） 以下本発明の実施例を図を用いて説明する。(Example) Embodiments of the present invention will be described below with reference to the drawings.
第２図は受信局数が２局の場合について、各局
のあいだのやりとりを示す説明図である。ここで
は説明のため再送制御としては一番簡単なStop
−and−wait法を使つた場合について示す。 FIG. 2 is an explanatory diagram showing the exchange between each station when the number of receiving stations is two. For the purpose of explanation, we will use the simplest method of retransmission control, Stop.
The case of using the -and-wait method is shown below.
Stop−and−wait法は情報フレームを１つづつ
送信する方法であり、送信側では受信側が前の情
報フレームを正常に受信したことを確認できるま
では再送をくり返し、新しい情報フレームを送る
ことができない。受信局でもまた、必ず順番どお
りにしか受信しないため、受信バツフアは基本的
には１情報フレーム分だけ持つていれば行うこと
ができる。ここでは同報通信サーバーおよび受信
局１，２共１情報フレーム分のバツフアしか持た
ない場合について示す。 The stop-and-wait method is a method in which information frames are sent one by one, and the sending side repeats retransmission until the receiving side confirms that the previous information frame has been successfully received, and then sends a new information frame. Can not. Since the receiving station also always receives data only in order, it can basically do this by having a receiving buffer for only one information frame. Here, a case will be described in which the broadcast communication server and receiving stations 1 and 2 each have a buffer for only one information frame.
また、ここで示した例では送信局から同報通信
サーバー、および受信１，２へのチヤンネル、同
報通信サーバーから受信局１，２へのチヤンネル
および各受信応答用チヤンネルは論理的に別々に
設けられているものとする。図中Ｉ（・）は情報
フレームを、Ａ（・）は受信確認フレームを、Ｎ
（・）は再送要求フレームを、I′（・）は再送フレ
ームを表し、そのフレームの動きを各々実線、破
線、一点鎖線、実線で示してある。 In addition, in the example shown here, the channels from the transmitting station to the broadcast communication server and reception stations 1 and 2, the channels from the broadcast communication server to reception stations 1 and 2, and the channels for each reception response are logically separate. shall be provided. In the figure, I(・) indicates the information frame, A(・) indicates the reception confirmation frame, and N
(.) represents a retransmission request frame, and I' (.) represents a retransmission frame, and the movement of the frame is shown by a solid line, a broken line, a dashed-dotted line, and a solid line, respectively.
まず時点１で送信局より送られた情報フレーム
Ｉ（１）は時点２で同報通信サーバーおよび受信
局１，２に受信されるが、ここで受信局２は誤り
受信したものとする。同報通信サーバーからの受
信確認Ａ（１）は送信局へ、受信局１からの受信
確認Ａ（１）および受信局２からの再送要求Ｎ
（１）は同報通信サーバーへ各々時点３に到着す
る。同報通信サーバーからの受信確認Ａ（１）を
受け取つた送信局は時点３に情報フレームＩ（２）
を送信する。一方同報通信サーバーは受信局２か
らの再送要求Ｎ（１）を受け取つたので再送
I′（１）を行う。時点４で同報通信サーバーは送
信局からの情報フレームＩ（２）を受信するが１
つ前の情報フレームＩ（１）の受信確認が受信局
２からまだ得られてないため１フレーム分しかな
いバツフアにＩ（１）を保持したままであり、従
つて新たに到着した情報フレームＩ（２）はバツ
フアオーバーフローのため受信できず再送要求Ｎ
（２）を送り返す。受信局１，２では時点４で送
信局からの新しい情報フレームＩ（２）および同
報通信サーバーからの再送フレームI′（１）が到
着するが、受信局１ではすでにＩ（１）は正常受
信し終わつているためＩ（２）を受信し受信局２
では、Ｉ（１）がまだ受信できていないので
I′（１）を受信する。受信局１は受信確認Ａ（２）
を、受信局１は受信確認Ａ（１）を各々同報通信
サーバーに送り返す。時点５で送信局は同報通信
サーバーから再送要求Ｎ（２）を受信したので
I′（２）を再送する。同報通信サーバーは受信局
１，２からの受信応答が受信確認だつたので何も
しない。時点６で送信局からの再送フレーム
I′（２）が同報通信サーバーおよび受信局１，２
に到着する。受信局１はすでにＩ（２）を正常受
信しているので受信しないが、同報通信サーバー
と受信局２はI′（２）を受信し各々受信確認Ａ
（２）を送信する。以上簡単な実施例について説
明したが、より複雑な再送制御法を使用した場合
でも行うことができる。 First, the information frame I(1) sent from the transmitting station at time 1 is received by the broadcast communication server and receiving stations 1 and 2 at time 2, but here it is assumed that receiving station 2 receives the frame in error. Receipt confirmation A(1) from the broadcast communication server is sent to the transmitting station, receipt confirmation A(1) from receiving station 1 and retransmission request N from receiving station 2.
(1) each arrive at the broadcast server at time 3. The transmitting station, having received the reception confirmation A(1) from the broadcast communication server, transmits the information frame I(2) at time 3.
Send. On the other hand, the broadcast communication server receives the retransmission request N(1) from receiving station 2, so it retransmits the request.
Perform I'(1). At time point 4, the broadcast communication server receives information frame I(2) from the transmitting station, but 1
Since reception confirmation of the previous information frame I(1) has not yet been obtained from the receiving station 2, I(1) is still held in the buffer of only one frame, and therefore the newly arrived information frame I (2) could not be received due to buffer overflow and retransmission request N
(2) is sent back. At time 4, a new information frame I(2) from the transmitting station and a retransmission frame I'(1) from the broadcast communication server arrive at receiving stations 1 and 2, but I(1) is already normal at receiving station 1. Since reception has finished, receiving station 2 receives I(2).
So, since I(1) has not been received yet,
Receive I'(1). Receiving station 1 confirms reception A (2)
, the receiving station 1 sends a reception confirmation A(1) back to the broadcast communication server. At time 5, the transmitting station receives retransmission request N(2) from the broadcast communication server, so
Resend I'(2). The broadcast communication server does nothing because the reception responses from receiving stations 1 and 2 are reception confirmations. Retransmitted frame from transmitting station at time 6
I'(2) is the broadcast communication server and receiving stations 1 and 2
arrive at. Receiving station 1 has already received I(2) normally, so it does not receive it, but broadcast communication server and receiving station 2 receive I'(2) and each sends a reception confirmation A.
Send (2). Although a simple embodiment has been described above, it is also possible to use a more complicated retransmission control method.
（発明の効果）
以上説明した通り本発明によれば、従来の方式
で行う場合全ての送信局に成り得る局が備えてい
るべき構成と同程度の規模の同報通信サーバーを
導入することにより、送信局においては特別の処
理を必要とせず１対１通信と同じ制御で同報通信
を行うことができ、送信局のハードウエア、ソフ
トウエアの負荷が大きく軽減される。(Effects of the Invention) As explained above, according to the present invention, by introducing a broadcast communication server of the same size as the configuration that all stations that can become transmitting stations should have when using the conventional method, In the transmitting station, broadcast communication can be performed under the same control as one-to-one communication without requiring any special processing, and the load on the hardware and software of the transmitting station is greatly reduced.
第１図は本発明の基本的構成を示す構成図、第
２図は本発明の動作を説明するための説明図であ
る。
図において１−１は送信局、１−２は同報通信
サーバー、１−３１〜１−３ｎは受信局である。
FIG. 1 is a block diagram showing the basic configuration of the present invention, and FIG. 2 is an explanatory diagram for explaining the operation of the present invention. In the figure, 1-1 is a transmitting station, 1-2 is a broadcast communication server, and 1-31 to 1-3n are receiving stations.
Claims (1)
る同報通信を行う同報通信システムにおいて、送
信局と、複数の受信局と、送信局から送られる情
報フレームを受信し送信局に対して受信応答およ
び再送要求を行う一方、複数の受信局からの受信
応答を受信し、送信局に代わつて該複数受信局と
の間で再送制御を代行して行う特別な同報通信サ
ーバーとから成り、送信局は該同報通信サーバー
と該複数の受信局に対して情報フレームを送信
し、該同報通信サーバーからの受信応答だけに従
つて再送制御を行い、該複数の受信局は該送信局
からの情報を直接受信すると共に該同報通信サー
バーに対して受信応答および再送要求を行うこと
を特徴とする同報通信方式。1 In a broadcast communication system that performs broadcast communication in which information with the same content is transferred to multiple destinations at the same time, a transmitting station, multiple receiving stations, and an information frame sent from the transmitting station are received and received by the transmitting station. It consists of a special broadcast communication server that sends responses and retransmission requests, receives reception responses from multiple receiving stations, and performs retransmission control with the multiple receiving stations on behalf of the transmitting station, The transmitting station transmits information frames to the broadcast communication server and the plurality of receiving stations, performs retransmission control only according to reception responses from the broadcast communication server, and the plurality of receiving stations transmit information frames to the plurality of receiving stations. A broadcast communication system characterized by directly receiving information from a broadcast communication server and sending a reception response and retransmission request to the broadcast communication server.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5092485A JPS61210745A (en) | 1985-03-14 | 1985-03-14 | Broadcast communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5092485A JPS61210745A (en) | 1985-03-14 | 1985-03-14 | Broadcast communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61210745A JPS61210745A (en) | 1986-09-18 |
| JPH0567092B2 true JPH0567092B2 (en) | 1993-09-24 |
Family
ID=12872349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5092485A Granted JPS61210745A (en) | 1985-03-14 | 1985-03-14 | Broadcast communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61210745A (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH022726A (en) * | 1988-06-17 | 1990-01-08 | Fujitsu Ltd | Multi-address type satellite communication system |
| JP2555222B2 (en) * | 1989-09-14 | 1996-11-20 | 富士通株式会社 | Network control system |
| EP0765560A1 (en) | 1994-06-08 | 1997-04-02 | Hughes Aircraft Company | Apparatus and method for hybrid network access |
| WO1997037463A1 (en) * | 1996-03-29 | 1997-10-09 | Hitachi, Ltd. | Data transmitting method, data transmitter, data receiver, and data receiver network connecting device |
| JP2003224601A (en) * | 2002-01-30 | 2003-08-08 | Pfu Ltd | Device, method, and system for broadcasting, program thereof, and program recording medium |
| JP3777336B2 (en) * | 2002-03-11 | 2006-05-24 | 株式会社日立製作所 | Terminal that receives newspaper data |
| CN1957554B (en) * | 2004-03-29 | 2012-05-30 | 诺基亚公司 | Data repair enhancements for multicast/broadcast data distribution |
| WO2007099585A1 (en) * | 2006-02-28 | 2007-09-07 | Fujitsu Limited | Communication management method communication management and server |
| JP2009253382A (en) | 2008-04-01 | 2009-10-29 | Canon Inc | Terminal station, method, program, and system thereof |
| JP5157752B2 (en) * | 2008-08-27 | 2013-03-06 | 富士通株式会社 | COMMUNICATION SYSTEM, COMMAND INFORMATION STORAGE DEVICE, AND COMPUTER PROGRAM |
| 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 |
-
1985
- 1985-03-14 JP JP5092485A patent/JPS61210745A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61210745A (en) | 1986-09-18 |
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