JPS59110240A - Time-division multiplex communication system - Google Patents

Time-division multiplex communication system

Info

Publication number
JPS59110240A
JPS59110240A JP57219171A JP21917182A JPS59110240A JP S59110240 A JPS59110240 A JP S59110240A JP 57219171 A JP57219171 A JP 57219171A JP 21917182 A JP21917182 A JP 21917182A JP S59110240 A JPS59110240 A JP S59110240A
Authority
JP
Japan
Prior art keywords
data
dte
stdm
time division
transmission
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
JP57219171A
Other languages
Japanese (ja)
Inventor
Tetsuo Isayama
伊佐山 哲郎
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP57219171A priority Critical patent/JPS59110240A/en
Publication of JPS59110240A publication Critical patent/JPS59110240A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J3/00Time-division multiplex systems
    • H04J3/16Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1682Allocation of channels according to the instantaneous demands of the users, e.g. concentrated multiplexers, statistical multiplexers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Communication Control (AREA)

Abstract

PURPOSE:To improve transmission efficiency and to utilize effectively a circuit by performing resending control between a statistic time-division multiplexing device on a reception side and a data terminal device. CONSTITUTION:A device STDM which performs statistic time-division multiplex control by an intelligent function is connected between each data terminal device DTE and a transmission line. Then, if an underrun occurs between device STDM in a couple during data transmission, the resending control is performed between the reception-side devices STDM and DTE at the request of the reception-side device DTE which detects an error occurring due to the underrun.

Description

【発明の詳細な説明】 (1)0発明の技術分野 本発明はデータ通信系統における時分割多重通信方式に
関する1本発明による方式は例えば時分割多重装置のう
ち統計的多重化袋しくSTDM’)とデータ端末装置i
t (DTE )間のデータ伝送に用いられる。
DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a time division multiplex communication system in a data communication system.The system according to the present invention is, for example, a statistical multiplex system in a time division multiplex system (STDM'). and data terminal device i
It is used for data transmission between t (DTE).

(2)、技術の背景 近年2社会の発展と共に情報処理の分野におけるデータ
通信の占める割合が増々大なるものとなっておシ、それ
に伴いデータ通信の処理能力、高速性、信頼性等を考慮
した通信回線の効率的な利用が要望されている。
(2) Background of the technology In recent years, with the development of society, the proportion of data communication in the field of information processing has been increasing. There is a demand for efficient use of communication lines.

(3)、従来技術と間屯点 ′@1図は時分割多重通信方式の一般的な構成を示す。(3), Conventional technology and Maton point '@1 Figure shows a general configuration of a time division multiplex communication system.

第1図においてl−nは複数個の送信側データ端末装置
(DTE)を示し一1/〜n′は送信側と同数の受信側
データ端末袋@(DTE)?示す。Aは送信側の時分割
多重化装置(TDM)でありDTM(1−n)からのデ
ータを順次に時分割して伝送する。Bは受信側の時分割
多重化装置(TDM )であり受信したデータを順次に
振シ分けてDTE(1’〜n/ )に転送する。従来の
伝送方式ではDTElからDTEI’へ次にDTE2か
らDTE 2’ ヘさらにDTE nからDTE n’
へと順次時分割多重化して伝送する。しかしながら1例
えばDTE]からのデータが欠落していてもこの方式で
はタイムスロットとして伝送しているので空スロットと
なっておシ回線の有効利用が図られていない。この場合
2例えばDTE1台当92400bit/Sの回線速度
を使用するときはTDM間の回線速度はDTEの台数の
合計分だけの回線速度すなわち2400 X n bi
t / S必要とされるが、実際に空スロットが生ずる
ために伝送効率が悪いという問題があった。これに対し
て統計的時分割多重化制御を行なう時分割多重化装置(
STDM)  では、第2図に示すように送信側DTE
lから受信側DTE]’へ、DTE 2からDTE 2
’へ送信されるデータは、まずSTDM−Aに送出され
る。STDM−Aは受信側各DTEから受信したデータ
をまとめて1つのフレームに構成し受信側STDM−B
に送信する。その場合DTE l 、DTE2からの連
続したデータをすべて受信し終ってから送信するとST
DM−Aを通過することによる遅延が大きくなるため、
各DTEから】〜数バイト受信する毎に全DTE のデ
ータをまとめてSTDM−Bに送信する。第2図のST
DM−AとSTDM −Bt結ぶ回線上では咎DTEの
データをまとめたフレームが送信されている。このよう
にするととによfilつのフレームの中には複数のDT
E のデータが含まれてお41)STDM−Bが受信し
たときにどのDTEから送られてきたものか分かる様に
順序付けがなされている。STDM −Bは受信し次フ
レーム中から谷DTEのデータを分離し対応する DT
Eに送り出す。その場合STDM −Hの中で連続した
データ全すべて受信し終るまで蓄積すると、 STDM
−Bを通過することによる遅延が大きくなC8TDM−
Aから受信したデータは直ちにDTEに送シ出す。
In FIG. 1, l-n indicates a plurality of transmitting data terminal equipment (DTE), and -1/~n' indicates the same number of receiving data terminal equipment (DTE) as the transmitting side. show. A is a time division multiplexer (TDM) on the transmitting side, which sequentially time-divisions and transmits data from DTMs (1-n). B is a time division multiplexer (TDM) on the receiving side, which sequentially sorts the received data and transfers it to the DTEs (1' to n/). In the conventional transmission method, from DTEl to DTEI', then from DTE2 to DTE 2', and from DTE n to DTE n'
The data are sequentially time-division multiplexed and transmitted. However, even if data is missing from 1, for example, DTE, this system transmits it as a time slot, resulting in an empty slot, which does not allow effective use of the line. In this case 2, for example, when using a line speed of 92400 bit/S per DTE, the line speed between TDMs will be the line speed equal to the total number of DTEs, that is, 2400 x n bi
t/s is required, but there is a problem in that the transmission efficiency is poor because empty slots actually occur. On the other hand, a time division multiplexing device that performs statistical time division multiplexing control (
STDM) Then, as shown in Figure 2, the transmitting DTE
l to receiving DTE]', DTE 2 to DTE 2
The data sent to ' is first sent to STDM-A. STDM-A composes the data received from each DTE on the receiving side into one frame and sends it to STDM-B on the receiving side.
Send to. In that case, if you transmit after receiving all continuous data from DTE l and DTE2, ST
Since the delay due to passing through DM-A becomes large,
From each DTE ~ Every time several bytes are received, data from all DTEs is sent together to STDM-B. ST in Figure 2
On the line connecting DM-A and STDM-Bt, a frame containing data of the DTE is transmitted. In this way, multiple DTs can be created in one frame.
41) The data is ordered so that when STDM-B receives it, it can know from which DTE it was sent. STDM-B receives and separates the valley DTE data from the next frame and the corresponding DT
Send it to E. In that case, if all continuous data is accumulated in STDM-H until it is received, STDM
-C8TDM with large delay due to passing through B-
Data received from A is immediately sent to the DTE.

STDM −AとSTDM−Bの間を流れるフレームは
誤シ制御機能を持つHDLC手順等の伝送制御手順によ
って転送される。受信側STDMでフレーム中のデータ
に誤りを検出した場合にはそれに対応するフレームが送
信側STDMから再送される。これによp STDM間
でのデータ伝送はDTEからみてエラーが無いようにす
ることができるa印、上のような制御を行うことによシ
、送信側の成るDTEがデータを送信していない時は他
のDTE のデータを転送することによシ、DTE  
とSTDM間の回線速度の合計isTDM間の回線速度
よシも大きくすることができるのでSTDM間では従来
のTDMに比べてより多くのデータを伝送できるように
なる。しかし、第3図(alに示す如(STDM−Aか
ら個々のフレームによって伝送されてきたデータは受信
側のSTDMとDTE 0間では連結され連続したデー
タとして転送されるが、STDM−AおよびSTDM−
B間の伝送において途中のフレームにエラーが発生し誤
り制御によルそのフレームを再送するとその部分のデー
タが受信側STDMに到着するのが遅れることになる。
Frames flowing between STDM-A and STDM-B are transferred by a transmission control procedure such as an HDLC procedure having an error control function. If an error is detected in the data in a frame on the receiving side STDM, the corresponding frame is retransmitted from the transmitting side STDM. This allows data transmission between STDMs to be error-free from the DTE's perspective. When a DTE transfers data to another DTE,
Since the total line speed between isTDM and STDM can be increased, more data can be transmitted between STDM than in conventional TDM. However, as shown in FIG. −
If an error occurs in a frame in the middle of the transmission between B and B and that frame is retransmitted by error control, the arrival of that portion of data at the receiving side STDM will be delayed.

この場合、受(i側STDMではすでに受信したデータ
を次々にDTEに転送しているので第3図(b)に示す
如くデータ間にすき間が発生しアンダーランの状態とな
る。すなわちアンダーランの状態とは本来、時間通り到
着すべきデータが伝送品質の悪化などの7こめに一時的
に遅延して到着するような状態ケ称し、このアンダーラ
ンが発生しすき間が生じると受信側DTEではその彼達
れてDTE に到着したデータも含めてエラーが発生し
たと認識しこのようなエラーが発生したならば例えばH
DLC手順のような伝送制御手順に従って第3図(cl
に示す如く送信側DTE に対して再送全要求している
。このようにエラーが発生する度に送信側DTE に再
送要求するために伝送効率の低下を来していた。
In this case, since the receiving (i-side STDM) is transferring already received data to the DTE one after another, gaps occur between the data as shown in FIG. 3(b), resulting in an underrun state. A state is a state in which data that should normally arrive on time arrives with a temporary delay due to deterioration in transmission quality, etc. When this underrun occurs and a gap occurs, the receiving DTE They recognize that an error has occurred including the data that arrived at the DTE, and if such an error occurs, for example, H
According to transmission control procedures such as DLC procedures, FIG.
As shown in the figure, a full retransmission request is made to the transmitting DTE. In this way, each time an error occurs, a retransmission request is made to the transmitting DTE, resulting in a decrease in transmission efficiency.

(4)、発明の目的 本発明は上述の間甑点に鑑み、アンダーラン発生時に、
送受信データ端末装置間でデータの再送制御することな
く受信側の時分割多重装置と受信側データ端末装置間で
データの再送制御を行なうという着想に基づき、伝送効
率を向上させ2回線の有効利用が図れるような時分割多
重通信方式を提供することを目的とする。
(4) Purpose of the Invention In view of the above-mentioned shortcomings, the present invention provides, when an underrun occurs,
Based on the idea of controlling data retransmission between the time division multiplexing device on the receiving side and the data terminal device on the receiving side without controlling the retransmission of data between the transmitting and receiving data terminal devices, the system improves transmission efficiency and makes effective use of two lines. The purpose of the present invention is to provide a time division multiplex communication system that allows for multiple communication.

(5)1発明の構成 この目的は、本発明によれば、再送制御を行う伝送制御
手順を備えた複数のデータ端末装も:が伝送路を共有し
てデータ伝送を行なうデータ通信系統において、各デー
タ端末装着と伝送路との間にインテリジェント機能によ
シ統計的時分割多重制#を行なう時分割多重化装置を接
続し、データ伝送時に対となる時分割多重化装置間でア
ンダーランが発生した場合、該アンダーランに基づき発
生したエラーを検出する受信側のデータ端末装置の要求
に従って受信側の時分割多重化装置が受信側データ端末
装置との間で再送制御を行う、ことを特徴とするアンダ
ーラン制御が行われる時分割多重通信方式、を提供する
ことによシ達成される。
(5) 1 Structure of the Invention According to the present invention, in a data communication system in which a plurality of data terminal devices equipped with a transmission control procedure for performing retransmission control share a transmission path and perform data transmission, A time division multiplexer that performs statistical time division multiplexing using an intelligent function is connected between each data terminal attached and the transmission path, and an underrun is prevented between paired time division multiplexers during data transmission. If an underrun occurs, the time division multiplexing device on the receiving side performs retransmission control with the data terminal device on the receiving side in accordance with a request from the data terminal device on the receiving side that detects the error that has occurred based on the underrun. This is achieved by providing a time division multiplex communication system in which underrun control is performed.

(6)1発明の実施例 第4図は本発明による時分割多重通信方式を実施するた
めのインテリジェント機能を備える時分割多重化装置で
ある統計的時分割多重化装置(STDM : 5tat
istical  Time DivisionMul
tiplexer )の一実施例を示すブロック図であ
る。m4図において%STDMは送信側STDMからの
データを受信する受信制御部4】、受信データ全受信側
番DTE に振9分けるデータ振9分は部42、送信デ
ータバッファ部431.送信制御部432%送信済みデ
ータバッファ部433およびデータ制御部434を備え
各DTE  ごとに設けられる制御部43.により構成
される。このような構成において受信データは受信制御
部41からデータ振シ分は部42により振9分けられ送
信データバッファ431に送られる。送信制御部432
は送信データバッファ431からデータを取9出しDT
E に送出すると同時に送信済みデータバッファ433
に格納する。データ制御部434では受信側DTEから
の応答を見て到達確認されていれば送信済みデータバッ
ファ433内にある該データをクリアする。受信側DT
E からの応答が再送要求であれば送信済みデータバッ
ファ433内におる全データを再び送信データバッファ
431に移すようになっている。第5図に示すように受
信側STDM −Bは、受信側DTE からの再送要求
を送信側DTE に伝えることはせずにそれ自身で判断
する機能を石し再送要求されたデータを受信側DTE 
に再送することができる。
(6) 1 Embodiment of the Invention FIG. 4 shows a statistical time division multiplexer (STDM: 5tat) which is a time division multiplexer equipped with an intelligent function for implementing the time division multiplex communication system according to the present invention
istical Time DivisionMul
FIG. 2 is a block diagram illustrating an embodiment of a tiplexer. In the figure m4, %STDM is a reception control section 4 which receives data from the transmitting side STDM, a section 42 divides all received data into 9 divisions to the receiving side number DTE, and a transmission data buffer section 431. Transmission control unit 432% A control unit 43, which includes a transmitted data buffer unit 433 and a data control unit 434, and is provided for each DTE. Consisted of. In such a configuration, received data is divided into nine parts by the reception control section 41 by the data distribution section 42 and sent to the transmission data buffer 431. Transmission control section 432
takes out data from the transmit data buffer 431 and DT
At the same time as sending to E, the sent data buffer 433
Store in. The data control unit 434 checks the response from the receiving DTE and, if arrival is confirmed, clears the data in the transmitted data buffer 433. Receiving side DT
If the response from E is a retransmission request, all data in the transmitted data buffer 433 is moved to the transmitted data buffer 431 again. As shown in Figure 5, the receiving side STDM-B does not transmit the retransmission request from the receiving side DTE to the sending side DTE, but turns off the function of determining the retransmission request on its own and sends the data requested for retransmission to the receiving side DTE.
can be resent.

(7)1発明の効果 上述したような制御を行うことによ、iりSTDM間の
伝送において、データに遅れを生じアンダーランが発生
しても送受信DTE間で再送制御を行なうことなく受信
側STDMと受信側DTE  との間で再送制御を行う
ので嶽送効率を大幅に向上させることができる。
(7) 1 Effect of the invention By performing the control described above, even if data is delayed and an underrun occurs in transmission between i and STDM, the receiving side can be easily accessed without performing retransmission control between the transmitting and receiving DTE. Since retransmission control is performed between the STDM and the receiving DTE, the transmission efficiency can be greatly improved.

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

m1図は、従来の時分割多重通信方式の構成図、第2図
は、従来の統計的時分割多重化装置を使用した通信方式
の構成図。 183図(a) 〜(c)は、′C142図の構成によ
る通信を説明する図、 第4図は、本発明による時分割多重通信方式を実施する
ための統計的時分割多重化装置を示すプルツク線図、お
よび m5図は%第4図による装置の時分割多重通信を説明す
る図である。 (符号の説明) DTE(1−n)・・・・・・送信側データ端末装置、
DTE(]’〜n′)・・・・・・受傷゛側データ端末
装碇。 TDM−A 、−B・・・・・・時分割多重化装置、 
STDM −A 。 −B・・・・・・統計的時分割多重化装置、41・・・
・・・受信制御部242・・・・・・データ振シ分は部
、43・・・・・・制御部−431・・・・・・送信デ
ータバッファ、432・・・・・・送信制御部、433
・・・・・・送信済みデータバッファ、434・・・・
・・データ制御11部。 特許出願人 富士通株式会社 特許出願代理人 弁理士 青 木    朗 弁理士 西 舘 和 之 弁理士 円 1)幸 男 弁理士 山 口 昭 之
FIG. m1 is a block diagram of a conventional time division multiplexing communication system, and FIG. 2 is a block diagram of a communication system using a conventional statistical time division multiplexing device. 183(a) to (c) are diagrams for explaining the communication according to the configuration of FIG. The Pruck diagram and the m5 diagram are diagrams for explaining time division multiplex communication of the device according to FIG. 4. (Explanation of symbols) DTE (1-n)...Transmitting side data terminal device,
DTE (]'~n')... Injured side data terminal anchor. TDM-A, -B... Time division multiplexing device,
STDM-A. -B...Statistical time division multiplexing device, 41...
... Reception control section 242 ... Data distribution section, 43 ... Control section -431 ... Transmission data buffer, 432 ... Transmission control Department, 433
...Sent data buffer, 434...
...Data control section 11. Patent applicant Fujitsu Limited Patent agent Akira Aoki Patent attorney Kazuyuki Nishidate 1) Yukio Patent attorney Akira Yamaguchi

Claims (1)

【特許請求の範囲】[Claims] 1、再送制御を行なう伝送制御手順を備えた複数のデー
タ端末装置が伝送路を共有してデータ伝送を行なうデー
タ通信系統において、各データ端末装置と伝送路との間
にインテリジェント機能によシ統計的時分割多重制御を
行なう時分割多重化装置を接続し、データ伝送時に対と
なる時分割多重化装置間でアンダーランが発生した場合
、該アンダーランに基づき発生したエラーを検出する受
信側のデータ端末装置の要求に従って受信側の時分割多
重化装置が受信側データ端末装置との間で再送制御を行
う、ことを特徴とするアンダーラン制御が行われる時分
割多重通信方式。
1. In a data communication system in which multiple data terminal devices equipped with a transmission control procedure that performs retransmission control share a transmission path for data transmission, an intelligent function is installed between each data terminal device and the transmission path. When time division multiplexing equipment that performs time division multiplexing control is connected, and an underrun occurs between a pair of time division multiplexing equipment during data transmission, the receiving side detects an error that occurs based on the underrun. A time division multiplex communication system that performs underrun control, characterized in that a time division multiplexing device on the receiving side performs retransmission control with the data terminal device on the receiving side in accordance with a request from the data terminal device.
JP57219171A 1982-12-16 1982-12-16 Time-division multiplex communication system Pending JPS59110240A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57219171A JPS59110240A (en) 1982-12-16 1982-12-16 Time-division multiplex communication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57219171A JPS59110240A (en) 1982-12-16 1982-12-16 Time-division multiplex communication system

Publications (1)

Publication Number Publication Date
JPS59110240A true JPS59110240A (en) 1984-06-26

Family

ID=16731308

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57219171A Pending JPS59110240A (en) 1982-12-16 1982-12-16 Time-division multiplex communication system

Country Status (1)

Country Link
JP (1) JPS59110240A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6429043A (en) * 1987-07-24 1989-01-31 Hitachi Ltd Use system for high-efficiency line
US4899337A (en) * 1987-08-17 1990-02-06 Hitachi, Ltd. Time division multiplexer with automatic call function

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6429043A (en) * 1987-07-24 1989-01-31 Hitachi Ltd Use system for high-efficiency line
US4899337A (en) * 1987-08-17 1990-02-06 Hitachi, Ltd. Time division multiplexer with automatic call function

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