JP2003179584A - Synchronous method of network system - Google Patents
Synchronous method of network systemInfo
- Publication number
- JP2003179584A JP2003179584A JP2001379043A JP2001379043A JP2003179584A JP 2003179584 A JP2003179584 A JP 2003179584A JP 2001379043 A JP2001379043 A JP 2001379043A JP 2001379043 A JP2001379043 A JP 2001379043A JP 2003179584 A JP2003179584 A JP 2003179584A
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- Japan
- Prior art keywords
- synchronization
- time
- synchronization packet
- packet
- network
- 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.)
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Links
- 238000000034 method Methods 0.000 title claims description 16
- 230000001360 synchronised effect Effects 0.000 title abstract description 8
- 230000005540 biological transmission Effects 0.000 claims abstract description 36
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 11
- 238000010586 diagram Methods 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Data Exchanges In Wide-Area Networks (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、複数の機器がネッ
トワークで接続されたネットワークシステムにおいて、
同期用パケットに遅延時間の情報を添付することによっ
てシステム全体として同期のタイミングに遅延が生じな
いようにするネットワークシステムの同期方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network system in which a plurality of devices are connected by a network,
The present invention relates to a synchronization method for a network system in which delay time information is attached to a synchronization packet so that the synchronization timing is not delayed in the entire system.
【０００２】[0002]
【従来の技術】複数の機器がネットワークで接続された
システムにおいて、そのシステム全体で同期をとる方法
として、従来は、ある機器から所定の周期で同期用パケ
ットを送信すると、これを受信した他の機器が、その受
信のタイミングに基づいて同期信号を生成することによ
り、システム全体の同期がとられている。図６はその状
況を説明する図であり、機器A(601)と機器B(602)がネッ
トワーク(611)で接続されて、機器A(601)から機器B(60
2)に同期用パケット(621)が送信される状況を示してい
る。図５はその同期用パケット(621)が伝送されるとき
のタイミングチャートを示している。同期信号A1(501)
は機器A(601)が同期周期(500)で生成した同期信号、送
信処理時間A(510)は機器A(601)が同期用パケット送信処
理A(520)に要した処理時間、伝送時間(511)は同期用パ
ケット(621)をネットワーク(611)を介して伝送するに要
した時間、受信処理時間B(512)は機器B(602)が同期用パ
ケット受信処理B(521)に要した処理時間である。機器B
(602)は同期用パケット(621)を受信したときのタイミン
グに合せて同期信号B(503)を生成する。2. Description of the Related Art In a system in which a plurality of devices are connected by a network, as a method of synchronizing the entire system, conventionally, when a synchronization packet is transmitted from a certain device at a predetermined cycle, the other packet is received. The entire system is synchronized by the device generating a synchronization signal based on the reception timing. FIG. 6 is a diagram for explaining the situation, in which device A (601) and device B (602) are connected by a network (611), and device A (601) to device B (60).
2) shows a situation in which the synchronization packet (621) is transmitted. FIG. 5 shows a timing chart when the synchronization packet (621) is transmitted. Sync signal A1 (501)
Is the synchronization signal generated by device A (601) in the synchronization cycle (500), and the transmission processing time A (510) is the processing time and transmission time required by device A (601) for the synchronization packet transmission process A (520). 511) is the time required to transmit the synchronization packet (621) via the network (611), and the reception processing time B (512) was required by the device B (602) for the synchronization packet reception processing B (521). The processing time. Device B
(602) generates a synchronization signal B (503) at the timing when the synchronization packet (621) is received.
【０００３】[0003]
【発明が解決しようとする課題】ところが、上記のよう
にして同期信号が生成される時は、送信処理時間A(510)
と伝送時間(511)と受信処理時間B(512)が考慮されない
ため、機器間で同期のタイミングに遅延時間(513)が生
じるという問題点があった。そこで本発明は、このよう
な問題に鑑みてなされたものであり、複数の機器がネッ
トワークで接続されているシステムにおいて、システム
全体として同期のタイミングに遅延が生じないようにす
ることを目的とする。However, when the synchronization signal is generated as described above, the transmission processing time A (510)
Since the transmission time (511) and the reception processing time B (512) are not taken into consideration, there is a problem that a delay time (513) occurs in the timing of synchronization between devices. Therefore, the present invention has been made in view of such a problem, and it is an object of the present invention to prevent a delay in synchronization timing in the entire system in a system in which a plurality of devices are connected by a network. .
【０００４】[0004]
【課題を解決するための手段】本発明のネットワークシ
ステムの同期方法は、複数の機器がネットワークで接続
されたネットワークシステムにおいて、第１の機器が遅
延時間の情報を添付した同期用パケットを同期周期で送
信し、前記同期用パケットを受信した第２の機器が、前
記同期用パケットに添付されている前記遅延時間の情報
と前記ネットワークを介した前記同期用パケットの伝送
時間と、前記同期用パケットの受信処理に要する処理時
間とを前記同期周期から減算して同期信号生成待ち時間
を求め、求められた前記同期信号生成待ち時間の経過後
に前記第２の機器が前記同期信号を生成することを特徴
としており、前記同期用パケットを受信した前記第２の
機器は、前記同期用パケットを送信した前記第１の機器
以外の機器に前記同期用パケットを送信する必要がある
ときは、受信した前記同期用パケットに添付された前記
遅延時間の情報と前記ネットワークを介した前記同期用
パケットの伝送時間と、自機器の同期用パケット受信処
理時間と同期用パケット送信処理時間を加算した遅延時
間の情報と添付した同期パケットを送信することを特徴
としている。According to a method for synchronizing a network system of the present invention, in a network system in which a plurality of devices are connected via a network, a first device synchronizes a synchronization packet with a synchronization packet to which delay time information is attached. And transmitting the synchronization packet, the second device receives the synchronization packet, the delay time information attached to the synchronization packet, the transmission time of the synchronization packet through the network, and the synchronization packet. And the processing time required for the reception processing of the above is subtracted from the synchronization cycle to obtain the synchronization signal generation waiting time, and the second device may generate the synchronization signal after the obtained synchronization signal generation waiting time has elapsed. The second device that has received the synchronization packet is the device other than the first device that has transmitted the synchronization packet. When it is necessary to transmit a synchronization packet, the delay time information attached to the received synchronization packet, the transmission time of the synchronization packet through the network, and the synchronization packet reception process of the own device It is characterized in that the synchronization packet attached with the information of the delay time obtained by adding the time and the processing time for transmitting the synchronization packet is transmitted.
【０００５】[0005]
【発明の実施の形態】図２は本発明の方法が適用される
ネットワークシステムの接続図であり、図６と同じもの
である。図において、機器A(201)と機器B(202)はネット
ワーク(211)で接続されていて、機器A(201)から機器B(2
02)に同期用パケット(221)が送信される。図１は、機器
A201と機器B202の間で同期用パケット221が伝送される
ときのタイミングを示すタイミングチャートである。同
期周期(100)はネットワーク内211で想定される最大遅延
時間より十分大きな値であり、同期信号A1(101)と同期
信号A2(102)は同期周期(100)で機器A(201)が生成する信
号、送信処理時間A(110)は機器A(201)が同期用パケット
送信処理A(120)をするに必要な時間、遅延時間(111)は
同期用パケット(221)に添付される時間の情報、伝送時
間(112)は同期用パケット(221)をネットワーク(211)を
介して伝送するのに必要な時間、受信処理時間B(113)は
機器B(202)が同期用パケット受信処理B(121)をするに必
要な時間、同期信号生成待ち時間B(114)は同期信号B(10
3)を生成するまでの時間、同期信号B(103)は機器B(202)
で生成される信号である。機器A(201)は、同期信号A1(1
01)を入力すると同期用パケット送信処理A(120)をおこ
ない、同期用パケット(221)に遅延時間(111)の情報を添
付してネットワーク(211)上に送信する。この時の遅延
時間(111)は送信処理時間A(110)と同じ値である。同期
用パケット(221)は、伝送時間(112)後に機器B(202)で受
信される。これを受信すると、機器B(202)が同期用パケ
ット受信処理B(121)をおこない、遅延時間(111)と伝送
時間(112)と受信処理時間B(113)を同期周期(100)から減
算して同期信号生成待ち時間B(114)を求め、その時間の
経過後に同期信号B(103)を生成する。このため、機器A
(201)で生成される同期信号A2(102)と機器B(202)で生成
される同期信号B(103)との間は、タイミングに遅延が生
じない。図４は、２つのネットワークを介して３つの機
器が接続されたネットワークシステムの例であり、同期
用パケットを受信した機器がそのパケットを送信した機
器以外の機器に同期パケットを送信する場合について示
している。図に示されているように、機器A(401)と機器
B(402)はネットワークA(411)で接続され、機器B(402)と
機器C(403)はネットワークB(412)で接続されている。そ
して機器A(401)から機器B(402)に同期用パケットA(421)
が送信され、機器B(402)から機器C(403)に同期用パケッ
トB(422)が送信される。図３は、そのタイミングを示す
タイミングチャートである。同期周期(300)はネットワ
ーク内で想定される最大遅延時間より十分大きな値であ
り、同期信号A1(301)と同期信号A2(302)は機器A(401)が
同期周期(300)で生成する同期信号、送信処理時間A(31
0)は機器A(401)が同期用パケット送信処理A(320)をする
に必要な時間、遅延時間A(311)は同期用パケットA(421)
に添付される時間の情報、伝送時間A(312)は同期用パケ
ットA(421)をネットワークA(411)を介して伝送するに必
要な時間、受信処理時間B(313)は機器B(402)が同期用パ
ケット受信処理B(321)をするに必要な時間、同期信号生
成待ち時間B(314)は同期信号B(303)を生成するまでの時
間、同期信号B(303)は機器B(402)で生成される信号、送
信処理時間B(315)は機器B(402)が同期用パケット送信処
理B(322)をするに必要な時間、遅延時間B(316)は同期用
パケットB(422)に添付される時間の情報、伝送時間B(31
7)は同期用パケットB(422)をネットワークB(412)で伝送
するに必要な時間、受信処理時間C(318)は機器C(403)が
同期用パケット受信処理C(323)をするに必要な時間、同
期信号生成待ち時間C(319)は同期信号C(304)を生成する
までの時間、同期信号C(304)は機器C(403)で生成される
信号である。機器A(401)は、同期信号A1(301)を入力す
ると同期用パケット送信処理A(320)をおこない、同期用
パケットA(421)に遅延時間A(311)の情報を添付してネッ
トワークA(411)上に送信する。この時の遅延時間A(311)
は送信処理時間A(310)と同じ値である。同期用パケット
A(421)は、伝送時間A(312)後に機器B(402)で受信され
る。これを受信すると、機器B(402)が同期用パケット受
信処理B(321)をおこない、遅延時間A(311)と伝送時間A
(312)と受信処理時間B(313)を同期周期(300)から減算し
て同期信号生成待ち時間B(314)を求め、その時間の経過
後に同期信号B(303)を生成する。また機器B(402)は、同
期用パケット送信処理B(322)をおこない、同期用パケッ
トB(422)に遅延時間B(316)の情報を添付してネットワー
クB(412)上に送信する。この時の遅延時間B(316)は、遅
延時間A(311)と伝送時間A(312)と受信処理時間B(313)と
送信処理時間B(315)を加算した値である。同期用パケッ
トB(422)は、伝送時間B(317)後に機器C(403)で受信され
る。これを受信すると機器C(403)は、同期用パケット受
信処理C(323)をおこない、遅延時間B(316)と伝送時間B
(317)と受信処理時間C(318)を同期周期(300)から減算し
て同期信号生成待ち時間C(319)を求め、その時間の経過
後に同期信号C(304)を生成する。このため、機器A(401)
で生成される同期信号A2(302)と機器B(402)で生成され
る同期信号B(303)と機器C(403)で生成される同期信号C
(304)との間にはタイミングに遅延が生じない。以上、
２個か３個の機器がネットワークに接続されたネットワ
ークシステムを用いて本発明の実施例の説明をしたが、
本発明の趣旨に従えば、接続される機器の数は４個以上
でもよく、上記方法に準じて実施できることはいうまで
もない。2 is a connection diagram of a network system to which the method of the present invention is applied and is the same as FIG. In the figure, device A (201) and device B (202) are connected by a network (211), and device A (201) to device B (2
The synchronization packet (221) is transmitted to 02). Figure 1 shows the equipment
7 is a timing chart showing the timing when a synchronization packet 221 is transmitted between A201 and device B202. The sync cycle (100) is a value that is sufficiently larger than the maximum delay time expected in the network 211, and the sync signal A1 (101) and sync signal A2 (102) are generated by device A (201) at the sync cycle (100). Signal, transmission processing time A (110) is the time required for device A (201) to perform synchronization packet transmission processing A (120), delay time (111) is the time attached to synchronization packet (221) Information, the transmission time (112) is the time required to transmit the synchronization packet (221) via the network (211), and the reception processing time B (113) is the synchronization packet reception processing by the device B (202). The time required for B (121), the synchronization signal generation waiting time B (114) is the synchronization signal B (10
3) Time to generate, sync signal B (103) is device B (202)
Is a signal generated by. Device A (201) uses the sync signal A1 (1
When 01) is input, the synchronization packet transmission process A (120) is performed, and the information of the delay time (111) is attached to the synchronization packet (221) and transmitted on the network (211). The delay time (111) at this time is the same value as the transmission processing time A (110). The synchronization packet (221) is received by the device B (202) after the transmission time (112). Upon receiving this, the device B (202) performs the synchronization packet reception process B (121) and subtracts the delay time (111), transmission time (112), and reception process time B (113) from the synchronization cycle (100). Then, the synchronization signal generation waiting time B (114) is obtained, and the synchronization signal B (103) is generated after the lapse of the time. Therefore, device A
No delay occurs in the timing between the synchronization signal A2 (102) generated in (201) and the synchronization signal B (103) generated in the device B (202). FIG. 4 is an example of a network system in which three devices are connected via two networks, and shows a case where a device that receives a synchronization packet transmits a synchronization packet to a device other than the device that transmitted the packet. ing. As shown in the figure, device A (401) and device
B (402) is connected by network A (411), and device B (402) and device C (403) are connected by network B (412). Then, from device A (401) to device B (402), synchronization packet A (421)
Is transmitted, and the synchronization packet B (422) is transmitted from the device B (402) to the device C (403). FIG. 3 is a timing chart showing the timing. The synchronization cycle (300) is a value that is sufficiently larger than the maximum delay time expected in the network, and the synchronization signal A1 (301) and the synchronization signal A2 (302) are generated by the device A (401) in the synchronization cycle (300). Sync signal, transmission processing time A (31
0) is the time required for device A (401) to perform synchronization packet transmission processing A (320), delay time A (311) is synchronization packet A (421)
The transmission time A (312) is the time required to transmit the synchronization packet A (421) via the network A (411), and the reception processing time B (313) is the device B (402). ) Is the time required to perform the synchronization packet reception processing B (321), the synchronization signal generation waiting time B (314) is the time until the synchronization signal B (303) is generated, and the synchronization signal B (303) is the device B. Signal generated in (402), transmission processing time B (315) is the time required for device B (402) to perform synchronization packet transmission processing B (322), delay time B (316) is synchronization packet B (422) time information, transmission time B (31
7) is the time required for transmitting the synchronization packet B (422) on the network B (412), and the reception processing time C (318) is for the device C (403) to perform the synchronization packet reception processing C (323). The required time, the synchronization signal generation waiting time C (319) is the time until the synchronization signal C (304) is generated, and the synchronization signal C (304) is a signal generated by the device C (403). When the device A (401) receives the synchronization signal A1 (301), the device A (401) performs the synchronization packet transmission process A (320), attaches the information of the delay time A (311) to the synchronization packet A (421), and attaches the network A (411) Send on. Delay time at this time A (311)
Is the same value as the transmission processing time A (310). Packet for synchronization
A (421) is received by device B (402) after transmission time A (312). Upon receiving this, device B (402) performs synchronization packet reception processing B (321), and delay time A (311) and transmission time A
(312) and the reception processing time B (313) are subtracted from the synchronization cycle (300) to obtain the synchronization signal generation waiting time B (314), and after that time, the synchronization signal B (303) is generated. Further, the device B (402) performs the synchronization packet transmission process B (322), attaches the information of the delay time B (316) to the synchronization packet B (422), and transmits it on the network B (412). The delay time B (316) at this time is a value obtained by adding the delay time A (311), the transmission time A (312), the reception processing time B (313), and the transmission processing time B (315). The synchronization packet B (422) is received by the device C (403) after the transmission time B (317). Upon receiving this, the device C (403) performs the synchronization packet reception process C (323), and the delay time B (316) and transmission time B
(317) and the reception processing time C (318) are subtracted from the synchronization cycle (300) to obtain the synchronization signal generation waiting time C (319), and after that time, the synchronization signal C (304) is generated. Therefore, device A (401)
Sync signal A2 (302) generated by device, sync signal B (303) generated by device B (402), and sync signal C generated by device C (403)
There is no delay in timing with (304). that's all,
Although the embodiment of the present invention has been described using a network system in which two or three devices are connected to a network,
According to the spirit of the present invention, it is needless to say that the number of connected devices may be four or more, and the method can be carried out according to the above method.
【０００６】[0006]
【発明の効果】以上のべたように、本発明によれば、複
数の機器が接続されたネットワークシステムにおいて、
ある機器から同期用パケットに遅延時間の情報を添付し
て同期周期で送信し、同期用パケットを受信した他の機
器が同期用パケットに添付されている遅延時間の情報
と、同期用パケットのネットワークを介した伝送時間、
同期用パケット受信処理に要した処理時間を同期周期か
ら減算して同期信号生成待ち時間を求め、その待ち時間
経過後に同期信号を生成すること、また、同期用パケッ
トを送信した機器以外の他の機器に同期用パケットを送
信する必要がある場合には、同期用パケットに添付され
た遅延時間の情報に自機器の同期用パケット送信処理に
要した処理時間を加算して遅延時間を求め、これを同期
用パケットとして添付して送信する、というようにして
いるので、システム全体で同期のタイミングに遅延が生
じないという効果がある。As described above, according to the present invention, in a network system in which a plurality of devices are connected,
Delay time information is attached to a synchronization packet from one device and transmitted at the synchronization cycle, and the delay time information attached to the synchronization packet by another device that received the synchronization packet and the synchronization packet network Transmission time through,
The processing time required for the synchronization packet reception processing is subtracted from the synchronization cycle to obtain the synchronization signal generation waiting time, and the synchronization signal is generated after the waiting time has elapsed. If it is necessary to send a synchronization packet to the device, add the processing time required for the synchronization packet transmission process of the device itself to the delay time information attached to the synchronization packet to obtain the delay time. Is attached as a synchronization packet for transmission, so that there is an effect that no delay occurs in the synchronization timing in the entire system.
【図１】本発明の方法を説明するタイミングチャート
(その1)FIG. 1 is a timing chart illustrating the method of the present invention.
(Part 1)
【図２】本発明の方法を適用するネットワークの接続図
(その1)FIG. 2 is a connection diagram of a network to which the method of the present invention is applied.
(Part 1)
【図３】本発明の方法を説明するタイミングチャート
(その2)FIG. 3 is a timing chart illustrating the method of the present invention.
(Part 2)
【図４】本発明の方法を適用するネットワークの接続図
(その2)FIG. 4 is a connection diagram of a network to which the method of the present invention is applied.
(Part 2)
【図５】従来技術のタイミングチャートFIG. 5 is a timing chart of a conventional technique.
【図６】従来のネットワークの接続図FIG. 6 Connection diagram of a conventional network
201、401、601 機器A 202、402、602 機器B 211、611 ネットワーク 221、621 同期用パケット 403 機器C 411 ネットワークA 412 ネットワークB 421 同期用パケットA 422 同期用パケットB 201, 401, 601 Device A 202, 402, 602 Equipment B 211, 611 network 221, 621 Synchronization packet 403 Device C 411 Network A 412 Network B 421 Synchronization packet A 422 Sync packet B
Claims (2)
ットワークシステムにおいて、 第１の機器が遅延時間の情報を添付した同期用パケット
を同期周期で送信し、 前記同期用パケットを受信した第２の機器が、前記同期
用パケットに添付されている前記遅延時間の情報と前記
ネットワークを介した前記同期用パケットの伝送時間
と、前記同期用パケットの受信処理に要する処理時間と
を前記同期周期から減算して同期信号生成待ち時間を求
め、 求められた前記同期信号生成待ち時間の経過後に前記第
２の機器が前記同期信号を生成することを特徴とするネ
ットワークシステムの同期方法。1. In a network system in which a plurality of devices are connected by a network, a first device transmits a synchronization packet attached with delay time information at a synchronization cycle, and a second device receives the synchronization packet. The device subtracts information on the delay time attached to the synchronization packet, the transmission time of the synchronization packet through the network, and the processing time required for receiving the synchronization packet from the synchronization cycle. Then, the synchronization signal generation waiting time is calculated, and the second device generates the synchronization signal after the calculated synchronization signal generation waiting time has elapsed.
機器は、 前記同期用パケットを送信した前記第１の機器以外の機
器に前記同期用パケットを送信する必要があるときは、
受信した前記同期用パケットに添付された前記遅延時間
の情報と前記ネットワークを介した前記同期用パケット
の伝送時間と、自機器の同期用パケット受信処理時間と
同期用パケット送信処理時間を加算した遅延時間の情報
と添付した同期パケットを送信することを特徴とする請
求項１に記載のネットワークシステムの同期方法。2. The second device which has received the synchronization packet, when it is necessary to transmit the synchronization packet to a device other than the first device which has transmitted the synchronization packet,
Information obtained by adding the information on the delay time attached to the received synchronization packet, the transmission time of the synchronization packet through the network, the synchronization packet reception processing time of the device itself, and the synchronization packet transmission processing time The network system synchronization method according to claim 1, wherein a synchronization packet attached with time information is transmitted.
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| JP3802408B2 JP3802408B2 (en) | 2006-07-26 |
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