JPS6346845A - Transmission control system - Google Patents
Transmission control systemInfo
- Publication number
- JPS6346845A JPS6346845A JP61189524A JP18952486A JPS6346845A JP S6346845 A JPS6346845 A JP S6346845A JP 61189524 A JP61189524 A JP 61189524A JP 18952486 A JP18952486 A JP 18952486A JP S6346845 A JPS6346845 A JP S6346845A
- Authority
- JP
- Japan
- Prior art keywords
- slave station
- transmission
- signal
- transfer
- 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.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 91
- 238000004891 communication Methods 0.000 claims description 21
- 230000001360 synchronised effect Effects 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 abstract description 3
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
Landscapes
- Communication Control (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は同期式通信路で２つの局が接続される通信シス
テムにおける伝送制御方式に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transmission control method in a communication system in which two stations are connected via a synchronous communication path.
（従来の技術〕
従来の通信システムでは、単一の同期式通信路を用いて
電話など即時的な通信とテキストメールなど非同期的な
通信とを統合的に収容する場合、両者の通信回線を時分
割多重化する方式が用いられている。(Prior Art) In conventional communication systems, when a single synchronous communication path is used to integrally accommodate instant communication such as telephone calls and asynchronous communication such as text mail, the communication lines for both are A method of dividing and multiplexing is used.
ところが、このように時分割多重伝送により即時的およ
び蓄積的な情報を転送する場合、伝送制御フィールドの
位相が固定されるため、情報転送要求が発生してから上
り伝送路の伝送制御フィールドが始まるまでの待合わせ
時間が発生し、非同期通信に対する伝送制御の効率を低
下させる一因となっている。However, when instantaneous and cumulative information is transferred using time division multiplex transmission in this way, the phase of the transmission control field is fixed, so the transmission control field of the uplink transmission path starts after an information transfer request occurs. Waiting time occurs, which is one of the causes of lowering the efficiency of transmission control for asynchronous communication.
本発明は同期式通信路により主局および従局が接続され
る通信システムにおいて、従局から主局に向かう伝送路
の伝送効率を向上させ、データ転送速度を高速化できる
伝送制御方式を提供することを目的とする。The present invention aims to provide a transmission control method that can improve the transmission efficiency of the transmission path from the slave station to the master station and increase the data transfer rate in a communication system in which a master station and a slave station are connected by a synchronous communication path. purpose.
本発明は、全二重構成の同期式通信路により接続された
主局および従局からなる通信システムにおいて、前記従
局から前記主局に向かう上り伝送路には情報転送回線お
よび情報転送要求の信号回線が時分割多重化され、また
前記主局から前記従局に向かう下り伝送路には情報転送
回線および前記情報転送要求に対する情報転送許可の信
号回線が時分割多重化された主局−従局間における伝送
制御方式であって、前記従局において前記下り伝送路か
ら情報転送許可信号を受信した直後、この信号の解析処
理時間をおいて直ちに情報転送が開始できるように、前
記上り下り両伝送路のフレーム位相の間に位相差を与え
ることを特徴としている。The present invention provides a communication system consisting of a master station and a slave station connected by a full-duplex synchronous communication path, in which an upstream transmission path from the slave station to the master station includes an information transfer line and an information transfer request signal line. are time-division multiplexed, and an information transfer line and an information transfer permission signal line for the information transfer request are time-division multiplexed on the down transmission path from the master station to the slave station. The control method is such that immediately after the slave station receives an information transfer permission signal from the downlink transmission path, the frame phase of both the uplink and downlink transmission paths is adjusted so that information transfer can be started immediately after a period of time for analyzing this signal. It is characterized by providing a phase difference between the two.
第１図は、本発明で対象としている通信システムにおけ
る主局−従局間の通信の様子を示すタイムチャートであ
る。図中、５ＹＮＣはフレーム同期信号、ＣＮ Ｔ Ｌ
は伝送制御フィールド、ＩＮＦＯは情報フィールド、Ｓ
Ｒは転送要求信号、ＳＥは転送許可信号を示す。従局か
ら主局に向かう上り伝送路および主局から従局に向かう
下り伝送路においては一定長のフレームを用いた伝送が
行われ、そのフレームはＳ Ｙ Ｎ Ｃ、ＣＮ Ｔ Ｌ
、 Ｉ Ｎ ＦＯ等から構成される。また、上り伝
送路の伝送制御フィールドＣＮＴＬは従局から主局への
情報転送に関する転送要求信号ＳＲの伝送に利用され、
下り伝送路の伝送制御フィールドは転送要求信号ＳＲに
対する転送許可信号ＳＥの伝送に利用される。従局は、
主局を介してネットワークに送出すべき情報がある場合
、転送要求信号ＳＲを主局に伝送し、主局から転送許可
信号ＳＥを受信した直後の伝送フレームにおいて情報の
転送を行う。FIG. 1 is a time chart showing the state of communication between a master station and a slave station in a communication system targeted by the present invention. In the figure, 5YNC is a frame synchronization signal, CNTL
is the transmission control field, INFO is the information field, S
R indicates a transfer request signal, and SE indicates a transfer permission signal. Transmission is performed using frames of a fixed length on the upstream transmission path from the slave station to the master station and the downlink transmission path from the master station to the slave station, and the frames are S Y N C, C N T L
, INFO, etc. Furthermore, the transmission control field CNTL on the uplink transmission path is used to transmit a transfer request signal SR regarding information transfer from the slave station to the master station,
The transmission control field of the downlink transmission path is used to transmit the transfer permission signal SE in response to the transfer request signal SR. The subordinate is
If there is information to be sent to the network via the main station, a transfer request signal SR is transmitted to the main station, and the information is transferred in the transmission frame immediately after receiving the transfer permission signal SE from the main station.
上述のような主局−従局間同期式伝送路においては伝送
制御フィールドが画定されるため、従局において転送許
可信号を受信した後、上り伝送路の同期フレームが始ま
るまでの待合わせ時間が発生し、本来の非同期的な伝送
制御に比べて効率が低下する。本発明によると、こうし
た伝送効率の低下を最小にすることができる。Since a transmission control field is defined in the synchronous transmission line between the master station and the slave station as described above, there is a waiting time from when the slave station receives the transfer permission signal until the synchronization frame on the uplink transmission line starts. , the efficiency is lower than that of original asynchronous transmission control. According to the present invention, such reduction in transmission efficiency can be minimized.
すなわち第１図に示すように、主局−従局間同期式伝送
路において、フレーム周期をＴｆ、下り′および上り伝
送路における伝搬遅延時間をともにｔ４、フレーム同期
信号から伝送制御フィールド終了までの時間をｔｃとし
、また主局および従局における伝送制御情報の処理時間
をそれぞれｔ２いｔ２２とし、従局における下り伝送路
のフレーム同期信号に対する上り伝送路のフレーム同期
信号の遅延時間をＤとすると、従局において転送要求信
号ＳＲを送信したフレームの次のフレームまでに転送許
可信号ＳＥを受信するためには、前記遅延時間りに対し
、
１ｃ＋１．、≦Ｄ＜Ｔ、−（ｔｃ ＋２・ｔｄ＋ｔｐｚ
）の必要条件が与えられる。さらにこの時、従局におけ
る、転送許可信号を受信処理してから次のフレームまで
の待ち時間をＷとすると、Ｗ ＝ Ｄ −（ｔｅ ＋ｔ
９２）となり、前記遅延時間りをＤ ＝ ｔ ｃ”ｊｐ
２とすることにより、この待ち時間Ｗを最小にすること
ができる。That is, as shown in Fig. 1, in a synchronous transmission line between the master station and the slave station, the frame period is Tf, the propagation delay time in the downlink' and uplink transmission lines are both t4, and the time from the frame synchronization signal to the end of the transmission control field. is tc, the transmission control information processing time in the master station and the slave station is t2 and t22, respectively, and the delay time of the frame synchronization signal on the uplink transmission path with respect to the frame synchronization signal on the downlink transmission path at the slave station is D, then at the slave station, In order to receive the transfer permission signal SE by the frame following the frame in which the transfer request signal SR was transmitted, 1c+1. , ≦D<T, -(tc +2・td+tpz
) are given. Furthermore, at this time, if the waiting time at the slave station from receiving and processing the transfer permission signal to the next frame is W, then W = D - (te + t
92), and the delay time is D = t c”jp
By setting it to 2, this waiting time W can be minimized.
以上の、上り下り両伝送路のフレーム同期信号間の時間
差、即ち両フレーム間における位相差の付与は、従局に
おいて、下り伝送路のフレーム同期信号を検出する機能
、伝送制御情報の解析に必要な時間に等しい固定的な遅
延を与える機能、および遅延を与えられたタイミングか
ら上り伝送路のフレーム同期信号を発生させる機能によ
り実現される。The provision of the time difference between the frame synchronization signals on both the upstream and downstream transmission lines, that is, the phase difference between both frames, as described above, is necessary for the function of detecting the frame synchronization signal on the downlink transmission path and the analysis of transmission control information in the slave station. This is realized by the function of providing a fixed delay equal to time and the function of generating a frame synchronization signal for the upstream transmission path from the timing given the delay.
第２図は、本発明の一実施例を説明するための主局−従
局間同期式伝送路の概念的構成図、第３図は主局−従局
間における全二重構成の同期式伝送路のフレーム構成の
一例である。第２図中、２１は主局、２２は従局、２３
は主局から従局に向かう下り伝送路、２４は従局から主
局に向かう上り伝送路を示す。またフレームは、フレー
ム同期信号５ＹＮＣ，伝送制’＋ＩｎフィールドＣＮＴ
Ｌ、情報フィールドＩＮＦＯから構成される。FIG. 2 is a conceptual configuration diagram of a synchronous transmission line between a master station and a slave station for explaining an embodiment of the present invention, and FIG. 3 is a synchronous transmission line with a full duplex configuration between a master station and a slave station. This is an example of a frame configuration. In Figure 2, 21 is the main station, 22 is the slave station, 23
24 indicates a downlink transmission path from the master station to the slave station, and an uplink transmission path from the slave station to the master station. In addition, the frame has a frame synchronization signal 5YNC, a transmission system '+In field CNT
It consists of L and information field INFO.
従局２２において転送すべき情報パケットが存在する場
合、第１図に示すように、上り伝送路２４の伝送制御フ
ィールドＣＮＴＬを利用して転送要求信号ＳＲを主局２
１に送信する。従局２２から転送要求信号ＳＲを受信し
た主局２１はデータ受信準備の処理を行った後、下り伝
送路２３の伝送制御フィールドＣＮＴＬを利用して従局
２２に対して転送許可信号ＳＥを送信する。転送要求信
号ＳＲを送信した従局は、下り伝送路２３の各フレーム
において伝送制御フィールドを解析し、転送許可信号Ｓ
Ｅを受信した場合には、上り伝送路２４における直後の
伝送フレームの情報フィールドＩＮＦＯを利用して情報
パケットを転送する。When there is an information packet to be transferred in the slave station 22, as shown in FIG.
Send to 1. After receiving the transfer request signal SR from the slave station 22, the master station 21 performs data reception preparation processing, and then transmits a transfer permission signal SE to the slave station 22 using the transmission control field CNTL of the downlink transmission path 23. The slave station that has transmitted the transfer request signal SR analyzes the transmission control field in each frame of the downlink transmission path 23, and transmits the transfer permission signal S.
When E is received, the information field INFO of the immediately following transmission frame on the uplink transmission path 24 is used to transfer the information packet.
上述のような伝送制御を行う主局−従局間同期式伝送路
において、下り伝送路２３の伝送制御フィールドに転送
許可信号ＳＥが重畳された場合における、下り伝送路の
フレーム同期信号５ＹＮＣから同フレームの伝送制御フ
ィールドＣＮＴＬが終了するまでの時間をｔｃとし、伝
送制御情報を解析処理し、情報転送の準備が完了するま
でに必要とする時間ｔｐ□としたとき、Ｄ＝ｊｃ ”
ｔｐＺとなる遅延りを与える遅延回路を従局２２に設ヱ
し、主局−従局間の伝送路初期設定時において、まず主
局２１から下り伝送路２３にフレーム同期信号５ＹＮＣ
を送出し、従局２２は前記遅延回路により下り伝送路２
３のフレーム同期信号Ｓ Ｙ Ｎ Ｃの位相から上り伝
送路２４のフレーム同期信号Ｓ Ｙ Ｎ Ｃの位相を発
生させ、上り伝送路２４へのフレーム同期信号ＳＹ Ｎ
Ｃの送出を開始する。これによって、従局２２におい
て下り伝送路２３から転送許可信号ＳＥを受信した直後
、この信号の解析処理時間をおいて直ちに情報転送が開
始できるように、上り下り両伝送路のフレーム位相の間
に位相差を与えることができる。In the master station-slave station synchronous transmission line that performs transmission control as described above, when the transfer permission signal SE is superimposed on the transmission control field of the downlink transmission line 23, the same frame is transmitted from the frame synchronization signal 5YNC of the downlink transmission line. When tc is the time required to complete the transmission control field CNTL, and tp□ is the time required to analyze the transmission control information and complete preparations for information transfer, D=jc ”
A delay circuit that provides a delay of tpZ is installed in the slave station 22, and when initializing the transmission path between the master station and the slave station, a frame synchronization signal 5YNC is first sent from the master station 21 to the downlink transmission path 23.
The slave station 22 transmits
The phase of the frame synchronization signal SYNC of the uplink transmission path 24 is generated from the phase of the frame synchronization signal SYNC of No. 3, and the phase of the frame synchronization signal SYNC of the uplink transmission path 24 is generated.
Start sending C. As a result, immediately after the slave station 22 receives the transfer permission signal SE from the downlink transmission path 23, a position is placed between the frame phases of both the uplink and downlink transmission paths so that the information transfer can be started immediately after the analysis processing time of this signal. A phase difference can be given.
本発明により、全二重の同期式通信路により接続された
主局および従局とからなる通信システムにおいて、従局
から主局へ向かう伝送路の伝送制御に関し、同期式通信
において伝送制御フィールドの位相が固定されることに
伴うオーバヘッドを最小にすることができるため、主局
−従局間の伝送効率を向上させ、従局間のデータ転送速
度を高速化することができる。According to the present invention, in a communication system consisting of a master station and a slave station connected by a full-duplex synchronous communication path, the phase of the transmission control field in the synchronous communication is Since the overhead associated with being fixed can be minimized, the transmission efficiency between the master station and the slave stations can be improved, and the data transfer rate between the slave stations can be increased.
第１図は、本発明で対象としている通信システムにおけ
る主局−従局間の通信の様子を示すタイムチャート、
第２図は主局−従局間同期式伝送路の概念的構成図、
第３図は全二重構成の同期式伝送路の概念的なフレーム
構成を示す図である。
５ＹＮＣ・・・フレーム同期信号
ＣＮＴＬ・・・伝送制御フィールド
ＩＮＦＯ・・・情報フィールド
ＳＲ・・・従局から主局に送信される転送要求信号
ＳＥ・・・主局から従局に送信される転送許可信号
Ｄ・・・下り伝送路のフレーム同期信号に対する上り伝
送路のフレーム同期信暑の遅延時Ｔｔ・・・フレーム周
期
ｔ、・・・伝送路における伝搬遅延時間ｔ、・・・フレ
ーム同期信号から伝送制御フィールド終了までの時間
ｔｐｌｌ ｊｐ□・・・それぞれ主局および従局にお
ける伝送制御情報の処理時間
２１・・・主局
２２・・・従局Fig. 1 is a time chart showing the state of communication between a master station and a slave station in a communication system targeted by the present invention; Fig. 2 is a conceptual configuration diagram of a synchronous transmission line between a master station and a slave station; and Fig. 3 1 is a diagram showing a conceptual frame structure of a full-duplex synchronous transmission line; FIG. 5YNC...Frame synchronization signal CNTL...Transmission control field INFO...Information field SR...Transfer request signal sent from the slave station to the master station SE...Transfer permission signal sent from the master station to the slave station D...Delay time of frame synchronization signal on uplink transmission path with respect to frame synchronization signal on downlink transmission path Tt...Frame period t,...Propagation delay time t on transmission path,...Transmission from frame synchronization signal Time until the end of the control field tpll jp□...Processing time of transmission control information in the master station and slave station, respectively 21...Main station 22...Slave station
Claims (1)
および従局からなる通信システムにおいて前記従局から
前記主局に向かう上り伝送路には情報転送回線および情
報転送要求の信号回線が時分割多重化され、また前記主
局から前記従局に向かう下り伝送路には情報転送回線お
よび前記情報転送要求に対する情報転送許可の信号回線
が時分割多重化された主局−従局間における伝送制御方
式であって、前記従局において前記下り伝送路から情報
転送許可信号を受信した直後、この信号の解析処理時間
をおいて直ちに情報転送が開始できるように、前記上り
下り両伝送路のフレーム位相の間に位相差を与えること
を特徴とする伝送制御方式。(1) In a communication system consisting of a master station and a slave station connected by a full-duplex synchronous communication path, the uplink transmission path from the slave station to the master station includes an information transfer line and an information transfer request signal line. A transmission control system between a master station and a slave station, in which the downlink transmission path from the master station to the slave station is divided and multiplexed, and an information transfer line and a signal line for permission to transfer information in response to the information transfer request are time division multiplexed. Immediately after receiving the information transfer permission signal from the downlink transmission path at the slave station, the information transfer is performed between the frame phases of both the uplink and downlink transmission paths so that information transfer can be started immediately after a period of time for analyzing this signal. A transmission control method characterized by giving a phase difference to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61189524A JPS6346845A (en) | 1986-08-14 | 1986-08-14 | Transmission control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61189524A JPS6346845A (en) | 1986-08-14 | 1986-08-14 | Transmission control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6346845A true JPS6346845A (en) | 1988-02-27 |
Family
ID=16242729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61189524A Pending JPS6346845A (en) | 1986-08-14 | 1986-08-14 | Transmission control system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6346845A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1081744C (en) * | 1996-04-01 | 2002-03-27 | 株式会社丰田自动织机制作所 | Control valve for positive-displacement compressor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60240246A (en) * | 1984-05-15 | 1985-11-29 | Japanese National Railways<Jnr> | Transmitter |
-
1986
- 1986-08-14 JP JP61189524A patent/JPS6346845A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60240246A (en) * | 1984-05-15 | 1985-11-29 | Japanese National Railways<Jnr> | Transmitter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1081744C (en) * | 1996-04-01 | 2002-03-27 | 株式会社丰田自动织机制作所 | Control valve for positive-displacement compressor |
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| JPH05199274A (en) | Synchronization controller for plural communication paths |