JPH0129108B2 - - Google Patents
Info
- Publication number
- JPH0129108B2 JPH0129108B2 JP13150381A JP13150381A JPH0129108B2 JP H0129108 B2 JPH0129108 B2 JP H0129108B2 JP 13150381 A JP13150381 A JP 13150381A JP 13150381 A JP13150381 A JP 13150381A JP H0129108 B2 JPH0129108 B2 JP H0129108B2
- Authority
- JP
- Japan
- Prior art keywords
- packet
- transmission
- pkt
- transmitted
- packets
- 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
Links
- 230000005540 biological transmission Effects 0.000 claims description 37
- 238000000034 method Methods 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 9
- 238000007796 conventional method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
- Communication Control (AREA)
Description
【発明の詳細な説明】
本発明は、パケツト交換網におけるパケツト送
受信方式に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a packet transmission and reception system in a packet switching network.
パケツト交換網では、データ通信装置から送信
されるデータと、パケツト交換機自身が発生させ
る、網管理用データが、ともにパケツト形式で同
一伝送路を使用して送受信される。また、これら
のパケツトの中には、緊急に伝達を必要とするも
のと、非緊急のものが存在するが、非緊急のパケ
ツトを送信中に緊急のパケツトが発生した場合
に、非緊急のパケツトの送信が終了するまで緊急
のパケツトの送信を待合せる必要がある。このた
め、緊急パケツトの伝達遅延が大となり、緊急性
を全うできないという欠点がある。 In a packet switching network, data transmitted from a data communication device and network management data generated by the packet switching device itself are both transmitted and received in packet format using the same transmission path. Also, some of these packets require urgent transmission and others are non-urgent, but if an urgent packet occurs while a non-urgent packet is being transmitted, a non-urgent packet is transmitted. It is necessary to wait until the transmission of the urgent packet is completed. For this reason, there is a drawback that the transmission delay of the emergency packet becomes large and the urgency cannot be fulfilled.
本発明の目的は、上記した従来技術の欠点を解
決して緊急パケツトを非緊急の通常パケツトに優
先して送信できるようにするとともに、優先送信
が終了した後に通常パケツトの送信を簡易に再開
することのできるパケツト送受信方式を提供する
にある。 An object of the present invention is to solve the above-mentioned drawbacks of the prior art, to enable emergency packets to be transmitted with priority over non-urgent normal packets, and to easily resume normal packet transmission after priority transmission is completed. The purpose of the present invention is to provide a packet transmission/reception method that can transmit and receive packets.
上記目的を達成するため本発明は、送信側で、
非緊急の通常パケツトを送信中に緊急パケツトが
発生した場合に、送信中の通常パケツトの送信を
一時中断して、割込み送信されたパケツトである
ことを表示するためのフラグシーケンスを所定数
送信した後に該緊急パケツトを送信し、続いて再
度フラグシーケンスを所定数送信してから中断中
の通常パケツトの送信を再開するようにしたもの
である。 In order to achieve the above object, the present invention provides, on the transmitting side,
If an emergency packet occurs while a non-urgent normal packet is being transmitted, the transmission of the normal packet being transmitted is temporarily interrupted and a predetermined number of flag sequences are transmitted to indicate that the packet has been transmitted as an interrupt transmission. After that, the emergency packet is transmitted, and then a predetermined number of flag sequences are transmitted again, and then the interrupted transmission of the normal packet is resumed.
第１図で示すようなパケツト交換網において、
端末TAは端末TCに、端末TBは端末TDに対して、
それぞれ従来の第２図で示すようなパケツト
PKTA及びPKTBを送信する場合、PKTA及び
PKTBはそれぞれパケツト交換機PSA及びPSBで
蓄積された後、パケツト交換機PSCに送信され
る。この従来方式では、PKTBが緊急に送達され
る必要がある場合にも、第３図のようにPKTAを
送り終るまではPKTBの送信を待合せなければな
らないという問題点があつた。 In a packet switching network as shown in Figure 1,
Terminal T A to terminal T C , terminal T B to terminal T D ,
Each conventional packet as shown in Figure 2
When sending PKT A and PKT B , PKT A and
PKT B is stored in packet switches PS A and PS B, respectively, and then transmitted to packet switch PS C. This conventional method has the problem that even if PKT B needs to be delivered urgently, the transmission of PKT B must wait until PKT A has been sent, as shown in Figure 3.
本発明は、上記のような問題点を除去するため
に、第４図に示すように、PSCからPSDにPKTA
を送信中に、同じくPSCからPSDにPKTBを送信
する必要が生じた場合、PKTAの一部PKTA1を送
信した時点で送信を一時中断してPKTBを送信
し、PKTBの送信が完了した時点でPKTAの残り
部分PKTA2を送信することによつて、緊急を要
するパケツトを優先的に転送していくことを特徴
とする。 In order to eliminate the above-mentioned problems, the present invention transfers PKT A from PS C to PS D as shown in FIG.
If it becomes necessary to send PKT B from PS C to PS D while sending PKT B, after sending PKT A1 , which is part of PKT A , temporarily stop sending PKT B and send PKT B. It is characterized in that urgent packets are preferentially transferred by transmitting the remaining portion of PKT A2 , PKT A2 , when the transmission is completed.
本発明の実現例を以下に詳述する。 An implementation example of the present invention will be described in detail below.
パケツト交換においては、パケツトを送受信す
るための伝送制御手順としてハイレベルデータリ
ンク制御手順HDLCを使用する。このHDLCにお
いては、第２図に示すように、パケツトとパケツ
トの区切りを示すために、１以上のフラグシーケ
ンスＦを使用する。本発明は、パケツトとパケツ
トの区切りは２以上のＦを使用し、第５図に示す
ように、前後をそれぞれ１のＦで囲まれたPKTB
は、連続する１つのパケツトPKTAを、PKTA1の
PKTA2に分割する形で、PKTAに割込んで送信さ
れたパケツトであることを表示することによつ
て、緊急送信パケツトの優先送信を実現するパケ
ツト送受信方式である。第７図は、上記の優先送
信の実現例である。第６図で示すような割込制御
信号ISが“０”レベルにあるときはゲートG11及
びG12を閉じ、ゲートG01及びG02を開放すること
によつて通常パケツト送信制御部SEND0から通
常のパケツトPKTAを送信する。また、SEND0
ではパケツトの送信に先立つて、２以上のＦを送
信し、同じくパケツトの送信後にも２以上のＦを
送信する。次に、割込み送信パケツトPKTBの発
生によりISが“１”レベルに変化すると、G01及
びG02を閉じるとともにG11及びG12を開放するこ
とによつて、緊急パケツト送信制御部SEND1か
ら１のＦ及びそれに引続いてPKTBを送信し、最
後に１のＦを送信する。この間送信クロツクST
がG01で遮断されるためにSEND0はPKTAの一部
PKTA1を送信した時点で停止する。その後、
PKTB及び１のＦを送信し終ると、ISが“０”レ
ベルに復活し、G11及びG12を閉じG01，G02を開
放することによつて、SEND0からPKTAの残り
PKTA2の送信を再開する。 In packet switching, a high-level data link control procedure HDLC is used as a transmission control procedure for transmitting and receiving packets. In this HDLC, as shown in FIG. 2, one or more flag sequences F are used to indicate the separation between packets. In the present invention, two or more F's are used to separate packets, and as shown in FIG .
is one consecutive packet PKT A , PKT A1
This is a packet transmission/reception method that achieves priority transmission of emergency transmission packets by dividing the packet into PKT A2 and indicating that the packet was transmitted by interrupting PKT A. FIG. 7 is an example of implementing the above-mentioned priority transmission. When the interrupt control signal IS is at the "0" level as shown in FIG. 6, the normal packet transmission control unit SEND 0 is closed by closing gates G11 and G12 and opening gates G01 and G02 . Send a normal packet PKT A from. Also, SEND 0
Then, before transmitting a packet, two or more Fs are transmitted, and similarly, after transmitting a packet, two or more Fs are transmitted. Next, when IS changes to the "1" level due to the occurrence of interrupt transmission packet PKT B , by closing G 01 and G 02 and opening G 11 and G 12 , the emergency packet transmission control unit SEND 1 is Send 1 F, followed by PKT B , and finally send 1 F. During this time, the transmission clock ST
SEND 0 is part of PKT A because it is blocked by G 01
Stops after sending PKT A1 . after that,
After sending PKT B and F of 1, IS returns to “0” level, closes G 11 and G 12 , and opens G 01 and G 02 to send the rest of PKT A from SEND 0.
Resume sending PKT A2 .
次に、パケツト受信側での実現例を図８及び図
９に従つて説明する。第８図において、２以上の
Ｆに続いてPKTA1を受信中はゲートG0の出力信
号SG0及びゲートG1，G2への入力信号SG1は
“０”レベルにあり、G1を開放し、G2を閉じるこ
とによつて通常パケツト受信制御部RLSI0に受信
パケツトPKTA1を受信させる。その後、１のＦ
に続いてPKTBを受信すると、SG0は第８図のよ
うに“０”→“１”→“０”レベルに変化し、こ
れによりSG1は１レベル状態に変化する。この動
作により、G1を閉じ、G2を開放して、RLSI0の
受信動作を停止させるとともに、緊急パケツト受
信制御部RLSI1でPKTBを受信する。さらに、
PKTBに１のＦを受信に続いてPKTA2を受信する
とSG0が“０”→“１”→“０”レベルに変化
し、SG1が“１”→“０”に変化する。これによ
り、G1が開放し、G2が閉じることによりRLSI1
の受信動作を停止させ、PKTA2をRLSI0を受信す
る。以上の動作により、緊急送信パケツトPKTB
を通常パケツトPKTAに割込んで優先送信が可能
となる。 Next, an example of implementation on the packet receiving side will be explained with reference to FIGS. 8 and 9. In FIG. 8, while receiving PKT A1 following two or more F, the output signal SG 0 of the gate G 0 and the input signal SG 1 to the gates G 1 and G 2 are at the “0” level, and the G 1 is By opening G2 and closing G2 , the normal packet reception control section RLSI0 is made to receive the received packet PKT A1 . After that, 1 F
When PKT B is subsequently received, SG 0 changes from "0" to "1" to "0" level as shown in FIG. 8, and thereby SG 1 changes to the 1 level state. With this operation, G1 is closed, G2 is opened, and the reception operation of RLSI 0 is stopped, and the emergency packet reception control unit RLSI 1 receives PKT B. moreover,
When PKT A2 is received after receiving F of 1 in PKT B , SG 0 changes from "0" to "1" to "0" level, and SG 1 changes from "1" to "0" level. This causes G 1 to open and G 2 to close, resulting in RLSI 1
Stop the reception operation of PKT A2 and receive RLSI 0 . As a result of the above operations, the emergency transmission packet PKT B
This enables priority transmission by interrupting normal packet PKT A.
パケツトの最大長は、パケツト網によりそれぞ
れ異なるが、CCITTの勧告Ｘ、25では、32オク
テツトから1024オクテツトまでのパケツト長を規
定しており、フアクシミリ端末を収容するパケツ
ト網では、それ以上のパケツト長も考えられてい
る。 The maximum length of a packet varies depending on the packet network, but CCITT Recommendation is also being considered.
第１図はパケツト交換網の構成図、第２図は従
来方式のパケツト説明図、第３図は従来方式によ
るパケツトの送受信方式説明図、第４図は本発明
によるパケツト交換方式の送受信方式説明図、第
５図は第４図の方式のパケツト説明図、第６図は
第４図の方式の送信パケツトの形式の割込制御信
号の説明図、第７図は第４図の方式の送信制御部
の回路図、第８図は第４図の方式の送信パケツト
とゲート信号の関係説明図、第９図は第４図の方
式の受信制御部の回路図である。
第６図、IS：割込制御信号。第７図、PKT：
送信パケツト、ST：送信クロツク、G01，G02，
G11，G12：ゲート、SEND0：通常パケツト送信
制御部、SEND1：緊急パケツト送信制御部。第
８図、SG0，SG1：ゲート信号。第９図、RT：
受信クロツク、R0，R1，R2：シフトレジスタ、
DC0，DC1，DC2：デコーダ、G0，G1，G2：ゲー
ト、JKFF：JKフリツプフロツプ、RLSI0：通常
パケツト受信制御部、RLSI1：緊急パケツト受信
制御部、PKTC：受信パケツト処理部。
Figure 1 is a configuration diagram of a packet switching network, Figure 2 is an explanatory diagram of packets in the conventional system, Figure 3 is an explanatory diagram of a packet transmission and reception system in the conventional system, and Figure 4 is an explanation of a transmission and reception system in the packet switching system according to the present invention. 5 is an explanatory diagram of a packet in the method of FIG. 4, FIG. 6 is an explanatory diagram of an interrupt control signal in the format of a transmission packet in the method of FIG. 4, and FIG. 7 is an explanatory diagram of a transmission packet in the method of FIG. FIG. 8 is a circuit diagram of the control section; FIG. 8 is an explanatory diagram of the relationship between transmission packets and gate signals in the system of FIG. 4; FIG. 9 is a circuit diagram of the reception control section of the system of FIG. 4. FIG. 6, IS: Interrupt control signal. Figure 7, PKT:
Transmission packet, ST: Transmission clock, G 01 , G 02 ,
G11 , G12 : Gate, SEND 0 : Normal packet transmission control section, SEND 1 : Emergency packet transmission control section. Fig. 8, SG0 , SG1 : gate signals. Figure 9, RT:
Receive clock, R0 , R1 , R2 : shift register,
DC 0 , DC 1 , DC 2 : Decoder, G 0 , G 1 , G 2 : Gate, JKFF: JK flip-flop, RLSI 0 : Normal packet reception control section, RLSI 1 : Emergency packet reception control section, PKT C : Reception packet processing section.
Claims (1)
置において、送信側で、緊急に送信を必要としな
い通常パケツトを送信する際にパケツトとパケツ
トの区切りを示すためにハイレベルデータリンク
制御手順HDLC上のフラグシーケンスを２以上挿
入して送信し、通常パケツトを送信中に緊急に送
信を必要とする緊急パケツトが発生したとき、送
信中の通常パケツトを一時中断して、上記フラグ
シーケンスをパケツトとパケツトの区切りを示す
ために挿入する数よりも少ない所定数だけ送信し
た後に該緊急パケツトを送信し、続いて上記フラ
グシーケンスを再度所定数送信した後に中断中の
通常パケツトの送信を再開することを特徴とする
パケツト送受信方式。1 In a communication device that communicates data in packet format, a flag on the high-level data link control procedure HDLC is used on the transmitting side to indicate the separation between packets when transmitting normal packets that do not require urgent transmission. When two or more sequences are inserted and transmitted, and an emergency packet that requires urgent transmission occurs while a normal packet is being transmitted, the normal packet being transmitted is temporarily interrupted, and the above flag sequence is used as a delimiter between packets. The present invention is characterized in that the emergency packet is transmitted after transmitting a predetermined number of packets smaller than the number inserted to indicate the emergency packet, and then the flag sequence is transmitted again a predetermined number of times, and then the interrupted transmission of normal packets is resumed. Packet transmission/reception method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56131503A JPS5834650A (en) | 1981-08-24 | 1981-08-24 | Packet switching system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56131503A JPS5834650A (en) | 1981-08-24 | 1981-08-24 | Packet switching system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5834650A JPS5834650A (en) | 1983-03-01 |
| JPH0129108B2 true JPH0129108B2 (en) | 1989-06-07 |
Family
ID=15059536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56131503A Granted JPS5834650A (en) | 1981-08-24 | 1981-08-24 | Packet switching system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5834650A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0642749B2 (en) * | 1986-05-02 | 1994-06-01 | 富士通株式会社 | Digital subscriber line control system |
| US6153049A (en) * | 1998-03-25 | 2000-11-28 | The Dow Chemical Company | Method for inhibiting the deposition of white pitch in paper production using ethylene amine compound |
| JP6516215B2 (en) * | 2015-03-25 | 2019-05-22 | セイコーソリューションズ株式会社 | Synchronization message transmitter, time synchronization system, synchronization message transmission method and program |
| JP6516217B2 (en) * | 2015-03-25 | 2019-05-22 | セイコーソリューションズ株式会社 | Synchronization message transmitter, time synchronization system, synchronization message transmission method and program |
| JP6516216B2 (en) * | 2015-03-25 | 2019-05-22 | セイコーソリューションズ株式会社 | Synchronization message transmitter, time synchronization system, synchronization message transmission method and program |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5362906A (en) * | 1976-11-17 | 1978-06-05 | Fujitsu Ltd | Message transmission system |
| JPS54102818A (en) * | 1978-01-30 | 1979-08-13 | Nippon Telegr & Teleph Corp <Ntt> | Data frame transmission system |
| JPS5696558A (en) * | 1979-12-29 | 1981-08-04 | Fujitsu Ltd | Communication system of message priority |
-
1981
- 1981-08-24 JP JP56131503A patent/JPS5834650A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5362906A (en) * | 1976-11-17 | 1978-06-05 | Fujitsu Ltd | Message transmission system |
| JPS54102818A (en) * | 1978-01-30 | 1979-08-13 | Nippon Telegr & Teleph Corp <Ntt> | Data frame transmission system |
| JPS5696558A (en) * | 1979-12-29 | 1981-08-04 | Fujitsu Ltd | Communication system of message priority |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5834650A (en) | 1983-03-01 |
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