JPH0341845A - Packet transmission system - Google Patents

Packet transmission system

Info

Publication number
JPH0341845A
JPH0341845A JP1176721A JP17672189A JPH0341845A JP H0341845 A JPH0341845 A JP H0341845A JP 1176721 A JP1176721 A JP 1176721A JP 17672189 A JP17672189 A JP 17672189A JP H0341845 A JPH0341845 A JP H0341845A
Authority
JP
Japan
Prior art keywords
packet
priority channel
channel
priority
reply time
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
JP1176721A
Other languages
Japanese (ja)
Inventor
Yoshihisa Okamoto
岡本 善久
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP1176721A priority Critical patent/JPH0341845A/en
Publication of JPH0341845A publication Critical patent/JPH0341845A/en
Pending legal-status Critical Current

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  • Data Exchanges In Wide-Area Networks (AREA)
  • Communication Control (AREA)

Abstract

PURPOSE:To relieve the load of a terminal equipment and to reduce the traffic in a packet exchange network by selecting a logical channel whose reply time is shortest as a priority channel and sending a packet only to the channel. CONSTITUTION:A reply time detection section 15 of a sender side terminal equipment 10 detects a time required from the transmission of a packet to each logical channel till the reception of a relevant reply packet as a reply time and informs it to a priority channel selection section 14. A selection section 14 selects a logical channel whose reply time is minimum as a priority channel and gives a command of transmission of the succeeding packet only to the priority channel to a logical channel selection section 12. The selection section 12 selects only the priority channel according to a command of the selection section 14 and sends the succeeding packet only to the channel. After the selection of the priority channel, the selection section 14 compares the reply time informed from the detection section 15 with a prescribed value and when the reply time is a prescribed value or below, the priority channel during selection is kept holding. The prescribed value is decided from the shortest reply time.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、データ通信システムなどに利用されるパケッ
ト伝送方式に関するものである。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a packet transmission method used in data communication systems and the like.

(従来の技術) CCITT勧告X、25によれば、固定的なパケット形
態端末間で固定的な論理チャネルを設定してパケット伝
送を行うパーマネント・バーチャル・サーキット(P 
V C)が規定されている。
(Prior Art) According to CCITT Recommendations
V C) is specified.

従来、このPvCのもとて複数の論理チャネルを設定し
てパケット伝送を行う場合、送信側では設定されている
全ての論理チャネルに同一データのパケットを送出し、
受信側では受信したパケットのうち不要なものを廃棄し
ている。
Conventionally, when transmitting packets by setting multiple logical channels under PvC, the sending side sends packets of the same data to all the set logical channels,
On the receiving side, unnecessary packets are discarded among the received packets.

(発明が解決しようとする課題) 上記従来のPVCのもとてのパケットデータ方式では、
複数の論理チャネルに同一データのパケット伝送が行わ
れるため、パケット交換網内のトラヒックが増大すると
共に、端末装置側の負荷も増加するという問題がある。
(Problem to be solved by the invention) In the original packet data method of the above-mentioned conventional PVC,
Since packet transmission of the same data is performed on a plurality of logical channels, there is a problem that the traffic within the packet switching network increases and the load on the terminal device side also increases.

(課題を解決するための手段) 本発明のパケット伝送方式によれば、PVCのもとてパ
ケット伝送を行う送信側端末装置が、優先チャネルの未
選択状態では予め設定されている全ての論理チャネルに
同一のデータを含むパケットを送出すると共に優先チャ
ネルの選択状態ではこの優先チャネルのみにパケットを
送出する手段と、優先チャネルの未選択状態では各パケ
ットの送出から応答パケットの受信までに要した応答時
間を監視しこの応答時間が最短の論理チャネルを優先チ
ャネルとして選択すると共に優先チャネルの選択状態で
はこの優先チャネルに送出したパケットに対する応答時
間を監視しこれが所定値を越えるたびに優先チャネルの
未選択状態とする手段とを備え、パケット交換網内のト
ラヒックの増加を回避すると共に端末装置の負荷を軽減
するように構成されている。
(Means for Solving the Problems) According to the packet transmission method of the present invention, a transmitting terminal device that performs packet transmission using PVC uses all preset logical channels when a priority channel is not selected. means to send a packet containing the same data to the priority channel and send the packet only to this priority channel when the priority channel is selected, and the response required from sending each packet to receiving the response packet when the priority channel is not selected. The time is monitored, and the logical channel with the shortest response time is selected as the priority channel, and when the priority channel is selected, the response time for packets sent to this priority channel is monitored, and whenever this exceeds a predetermined value, the priority channel is selected. The packet switching network is configured to avoid an increase in traffic within the packet switching network and to reduce the load on the terminal equipment.

以下、本発明の作用を実施例と共に詳細に説明する。Hereinafter, the operation of the present invention will be explained in detail together with examples.

(実施例) 第1図は、本発明の一実施例のパケット伝送方式を通用
するパケット形態端末装置とパケット交換網の構成を示
すブロック図である。
(Embodiment) FIG. 1 is a block diagram showing the configuration of a packet type terminal device and a packet switching network that use a packet transmission method according to an embodiment of the present invention.

なお、図示の便宜上、端末装置10から端末装置20へ
のパケット伝送が行われるものとし、送信側端末装置1
0については主として送信に必要な機能ブロックが、ま
た受信側端末装置については主として受信に必要な機能
ブロックが図示されている。
For convenience of illustration, it is assumed that packet transmission is performed from the terminal device 10 to the terminal device 20, and the transmitting terminal device 1
For 0, functional blocks mainly necessary for transmission are shown, and for the receiving terminal device, functional blocks mainly necessary for reception are shown.

送信側端末装置10は、アプリケーション部11、論理
チャネル選択部12及びCCITT勧告X、25プロト
コル機能部13に加えて、優先チャネル選択部14と応
答時間検出部15とを備えている。また、受信側端末装
置20は、アプリケーション部21と、論理チャネル選
択部22と、X、25プロトコル機能部23と、応答パ
ケット送出部24とを備えている。
The sending terminal device 10 includes a priority channel selection section 14 and a response time detection section 15 in addition to an application section 11, a logical channel selection section 12, and a CCITT Recommendation X, 25 protocol function section 13. The receiving terminal device 20 also includes an application section 21, a logical channel selection section 22, an X,25 protocol function section 23, and a response packet sending section 24.

送信側端末装置10からパケットの送出を開始する場合
には、優先チャネルは未選択の状態である。このため、
論理チャネル選択部12は受信側端末20との間に予め
設定されている全ての論理チャネルを選択してそれぞれ
に同一データのパケットを送出する。これらのパケット
は、パケット交換網30内の論理チャネル31.32・
・・3nを経て受信側端末装置20に伝送され、X、 
 25プロトコル機能部33と論理チャネル選択部22
とを経てアプリケーション部21に転送される。
When the sending terminal device 10 starts transmitting a packet, the priority channel is in an unselected state. For this reason,
The logical channel selection unit 12 selects all logical channels preset with the receiving terminal 20 and sends a packet of the same data to each logical channel. These packets are sent to logical channels 31, 32,
...3n to the receiving terminal device 20,
25 protocol function section 33 and logical channel selection section 22
The data is transferred to the application section 21 through the following steps.

応答パケット送出部24は、パケットの受信を検出する
たびにこのパケットを受信した旨を送信側に通知するた
めの応答パケットを対応の論理チャネルに送出する。
Every time the response packet sending unit 24 detects reception of a packet, it sends a response packet to the corresponding logical channel to notify the sending side that the packet has been received.

送信側端末装置10の応答時間検出部15は、各論理チ
ャネルにパケットを送出してから対応の応答パケットを
受信するまでに要した時間を応答時間として検出し、優
先チャネル選択部14に通知する。優先チャネル選択部
14は、応答時間が最小の論理チャネルを優先チャネル
として選択し、以後のパケットの送出はこの優先チャネ
ルに対してのみ行うことを論理チャネル選択部12に指
令する。論理チャネル選択部12は、上記優先チャネル
選択部14の指令に従って、優先チャネルのみを選択し
てこれのみに後続のパケットを送出する。
The response time detection unit 15 of the sending terminal device 10 detects the time required from sending a packet to each logical channel to receiving the corresponding response packet as a response time, and notifies the priority channel selection unit 14. . The priority channel selection unit 14 selects the logical channel with the minimum response time as the priority channel, and instructs the logical channel selection unit 12 to transmit subsequent packets only to this priority channel. The logical channel selection unit 12 selects only the priority channel and sends subsequent packets only to this priority channel in accordance with the instructions from the priority channel selection unit 14.

優先チャネル選択部14は、優先チャネルの選択後は、
応答時間検出部15から通知される応答時間を所定値と
比較し、応答時間が所定値以下であれば選択中の優先チ
ャネルを保持し続ける。この所定値は、現在の優先チャ
ネルを選択した際の最短の応答時間に一定のマージンを
付すなどの適宜な方法で決定される。
After selecting the priority channel, the priority channel selection unit 14 selects the priority channel.
The response time notified from the response time detection unit 15 is compared with a predetermined value, and if the response time is less than or equal to the predetermined value, the selected priority channel is continued to be held. This predetermined value is determined by an appropriate method such as adding a certain margin to the shortest response time when the current priority channel is selected.

一方、優先チャネル選択部14は、応答時間が上記所定
値を越えた場合には、選択中の優先チャネルを廃棄する
ことにより優先チャネルの未選択状態に移行し、全ての
論理チャネルへのパケットの送出を論理チャネル選択部
12に指令する。この後、優先チャネル選択部14は、
応答時間検出部15から通知される各論理チャネルの応
答時間を比較し、最短の応答時間の論理チャネルを新た
な優先チャネルとして選択し、この優先チャネルのみに
パケットを送出する旨を論理チャネル選択部12に指令
すると共に、応答時間と所定値との比較を開始する。
On the other hand, if the response time exceeds the predetermined value, the priority channel selection unit 14 discards the currently selected priority channel, transitions to a priority channel unselected state, and transfers packets to all logical channels. Instructs the logical channel selection unit 12 to send the data. After this, the priority channel selection unit 14
The logical channel selection unit compares the response times of each logical channel notified from the response time detection unit 15, selects the logical channel with the shortest response time as a new priority channel, and sends a packet only to this priority channel. 12 and starts comparing the response time with a predetermined value.

(発明の効果) 以上詳細に説明したように、本発明のパケット伝送方式
は、応答時間が最短の論理チャネルを優先チャネルとし
て選択しこれのみにパケットの送出を行う構成であるか
ら、パケット交換網内のトラヒックと端末装置の負荷が
軽減されるという効果が奏される。
(Effects of the Invention) As explained in detail above, the packet transmission method of the present invention has a configuration in which the logical channel with the shortest response time is selected as the priority channel and packets are sent only to this channel. The effect is that the traffic within and the load on the terminal device are reduced.

また、本発明のパケット伝送方式によれば、優先チャネ
ルの応答時間が所定値を越えるたびに新たな優先チャ′
ネルを選択し直す構成であるから、時々刻々変化するパ
ケット交換網内の伝送状態の変化に即応して常に応答時
間が最短の最適優先チャネルを選択できるという効果が
奏される。
Furthermore, according to the packet transmission method of the present invention, a new priority channel is
Since the channel is reselected, the optimum priority channel with the shortest response time can always be selected in response to changes in the transmission conditions within the packet switching network, which change from time to time.

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

第1図は、本発明の一実施例のパケット伝送方式を適用
する端末装置とゲット交換網の構成を示すブロック図で
ある。 10・・・送信側端末装置、20・・・受信側端末装置
、11.21・・・アプリケーション部、12.22・
・・論理チャネル選択部、13.23・・・X、25プ
ロトコル機能部、14・・・優先チャネル選択部、15
・・・応答時間検出部、24・・・応答パケット送出部
FIG. 1 is a block diagram showing the configuration of a terminal device and a get switching network to which a packet transmission system according to an embodiment of the present invention is applied. 10... Sending side terminal device, 20... Receiving side terminal device, 11.21... Application section, 12.22.
...Logic channel selection section, 13.23...X, 25 Protocol function section, 14...Priority channel selection section, 15
...Response time detection unit, 24...Response packet sending unit.

Claims (1)

【特許請求の範囲】 パケット交換網を介してPVCのもとでパケット伝送を
行うパケット伝送方式において、端末装置は、 優先チャネルの未選択状態では予め設定されている全て
の論理チャネルに同一のデータを含むパケットを送出す
ると共に優先チャネルの選択状態ではこの優先チャネル
のみにパケットを送出する手段と、 優先チャネルの未選択状態では各パケットの送出から応
答パケットの受信までに要した応答時間を監視しこの応
答時間が最短の論理チャネルを優先チャネルとして選択
し、優先チャネルの選択状態ではこの優先チャネルに送
出したパケットに対する前記応答時間を監視しこれが所
定値を越えるたびに前記優先チャネルの未選択状態とす
る手段を備えたことを特徴とするパケット伝送方式。
[Claims] In a packet transmission method in which packets are transmitted under PVC via a packet switching network, a terminal device transmits the same data to all preset logical channels when no priority channel is selected. In the state where a priority channel is selected, the packet is transmitted only to this priority channel, and when the priority channel is not selected, the response time required from the transmission of each packet to the reception of the response packet is monitored. The logical channel with the shortest response time is selected as the priority channel, and when the priority channel is selected, the response time for packets sent to this priority channel is monitored, and each time the response time exceeds a predetermined value, the priority channel is marked as unselected. A packet transmission method characterized by having a means for
JP1176721A 1989-07-07 1989-07-07 Packet transmission system Pending JPH0341845A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1176721A JPH0341845A (en) 1989-07-07 1989-07-07 Packet transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1176721A JPH0341845A (en) 1989-07-07 1989-07-07 Packet transmission system

Publications (1)

Publication Number Publication Date
JPH0341845A true JPH0341845A (en) 1991-02-22

Family

ID=16018617

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1176721A Pending JPH0341845A (en) 1989-07-07 1989-07-07 Packet transmission system

Country Status (1)

Country Link
JP (1) JPH0341845A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6690649B1 (en) 1998-05-22 2004-02-10 Nec Corporation QoS management apparatus
JP2010056990A (en) * 2008-08-29 2010-03-11 Hitachi Ltd Data communication method employing multiple connections
JP2015164013A (en) * 2014-02-28 2015-09-10 富士通株式会社 Information processing device, communication path determination program and communication path determination method
JP2016082373A (en) * 2014-10-16 2016-05-16 Necプラットフォームズ株式会社 Repeating device, communication device, communication path selection method and program

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6690649B1 (en) 1998-05-22 2004-02-10 Nec Corporation QoS management apparatus
JP2010056990A (en) * 2008-08-29 2010-03-11 Hitachi Ltd Data communication method employing multiple connections
JP2015164013A (en) * 2014-02-28 2015-09-10 富士通株式会社 Information processing device, communication path determination program and communication path determination method
JP2016082373A (en) * 2014-10-16 2016-05-16 Necプラットフォームズ株式会社 Repeating device, communication device, communication path selection method and program

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