JPH03209946A - Input control system for data switching network - Google Patents

Abstract

PURPOSE:To grasp a delay state at a data block transmission side exchange by sending a delay measurement data signal periodically from the data exchange to another data exchange and measuring the time up to the reception of a corresponding delay measurement answer data signal. CONSTITUTION:A data switching network 10 consists of plural data exchanges 11-1n, inter-office trunk lines 21-2n which connect the respective exchanges, etc., and the respective exchanges are accommodated with data terminals 31-3n. Further, the data terminals make a communication through a data switching network. The respective data exchanges have a response delay time measurement table 50 shown in a figure (a), an input control display table 60 shown in a figure (b), an answer delay time reference value table 70 shown in a figure (c) and a transmission stop time display table 80 shown in a figure (d), and the data exchanges compare the delay measurement answer data signal reception time 52 with the answer delay time reference value 71 and set an in-input-control display (FLG) 61 in the table 60 when the time 52 is larger than the reference value (A) 71 to stop sending data blocks to the corresponding data exchanges for a certain time.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention enables a data switching center that intends to transmit a data block to newly send a data block to the switching center that is delayed in processing a response to the transmitted data block. This invention relates to an input regulation method that temporarily stops the transmission of data blocks that have been requested to be transmitted, thereby reducing the load on exchanges experiencing processing delays.

[Conventional technology]

Conventionally, as described in Japanese Patent Application Laid-Open No. 57-11560, for example, the own switching center monitors the common resource usage rate within the packet switching center, and when the usage rate reaches a certain rate or more determined by the network, The exchange sends a notification signal to the adjacent station to which it sends packets, restricting packet transmission to the own exchange, thereby restricting input to the own exchange.

[Problem to be solved by the invention]

However, in the above conventional technology, the usage rate of the common resource is measured by the congested exchange itself, and the congested exchange also measures the usage rate of the common resource. Since the station itself has to transmit a regulation notification signal indicating that it will carry out the regulation, there is a risk that the processing at the comparison exchange will increase over time.

The purpose of the present invention is to solve the conventional problems as mentioned above,
An object of the present invention is to provide a traffic control method that detects congestion in a data switching center at a data block transmitting switching center and regulates input to a wide switching center.

[Means to solve the problem]

The above purpose is to provide a delay measurement data signal for measuring response delay;
A delay measurement response data signal is provided, and each data exchange center is provided with a delay reference value information storage table, a transmission stop display flag table, etc. corresponding to the exchange defined as the data exchange network.
Each data exchange station periodically sends a delay measurement data signal to each data exchange station, measures the time until it receives the delay measurement response data signal, and calculates the reference value shown in the delay reference value information table. This is achieved by stopping the data block transmission to the data exchange center for a certain period of time.

[Effect]

That is, the data exchange station periodically transmits delay measurement data signals to other data exchange stations that make up the network, and measures the time it takes to receive the corresponding delay measurement response data signal, thereby determining the time it takes to send a data block to the destination station. Since it is possible to understand the delay situation at the data block sending side exchange,
The data block transmitting station can control traffic regulation to the data block destination switching center depending on the delay time situation.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 is a block diagram showing an example of the configuration of a data exchange network. As shown in FIG. 1, the data exchange network 10 is composed of a plurality of data exchange stations 11 to 1n, and inter-office trunk lines 21 to 2n that connect each exchange, and each exchange has a data terminal 31. ~3n. Data terminals also communicate via a data exchange network.

Each data exchange station has a response delay time measurement table 50 shown in FIG. 2(a). Input regulation display table 60 shown in (b)
．． Response delay time reference value table 7o shown in (c) and (
The data exchange center has a transmission stop time display table 8o shown in d), and compares the delay measurement response data signal reception time 52 with the response delay time reference value 71, and determines the delay measurement response data signal transmission time as the response delay time. When the reference value (A) is 71 or more, the input restriction display table 60 displays an input restriction display (FLG).
) 61, and thereafter stops sending data blocks to the corresponding data exchange center for a certain period of time.

Below, according to the data block communication sequence shown in Figure 4,
The regulation at the data block transmitting station will be explained.

In FIG. 4, the data exchange center 100 is connected to the data exchange centers 101, 102, . Ion edits the delay measurement data signal 90 shown in FIG. 3 and sends it to each data switching center, and also matches the destination switching center address in the response delay time measurement table 50 shown in FIG. 2 (,). The provided response monitoring display flag (A) 51 is set to display the response monitoring timing activation. Thereafter, the data switching center 100 sends the delay measurement data signal to the destination switching center 101.1 corresponding to the station for which the response monitoring timing activation display is set.
02. Delay measurement response data signals 111, 12 from Ion
The time until 1,131 is received is counted and set in the delay measurement response data signal reception time (TIM) 52 of the response delay time measurement table 50. Now, when the delay measurement response data signal 111 is received from the exchange 101, information on the source data destination station address 91 of the delay measurement response data signal 90 shown in FIG. The response monitoring flag (A) 51 corresponding to the original data target station address 91 is set to display the response monitoring timing stop. Similarly, when the data exchange center 102 receives the delay measurement response data signals 121 and 131 from the Ion, the information on the destination station address 91 of the source data of the delay measurement response data signal 90 is extracted, and the response monitoring flag is flagged using the same idea. (A) Set 51 as response monitoring timing stop display.

On the other hand, the data switching center 100 periodically checks the delay measurement response data reception time (TIM) 52 of the response delay time measurement table 50 shown in FIG. 2(a) and the response delay time reference value shown in FIG. 2(c). Response delay time reference value (A
) 71, and if the delay measurement response data signal reception time (TIM) 52 is large, the input restriction display (FLG) 6 of the input restriction display table Go shown in FIG.
1 during regulation, input regulation time + 1 @ duration time (TC
) 62, the transmission stop time value (B) 81 shown in the transmission stop time display table 70 is set. Data exchange center 100
The input restriction display table 60 is monitored, and after input restriction continuation time (TC) 62, the input restriction display table 60 is displayed for destination exchanges whose input restriction display (FLG) 61 is set to be restricted. (FLG) 61 is set to non-restricted.

Next, the situation when data exchange 100 transmits data to another data exchange center will be described.

When the data exchanger 100 transmits the communication data block 200 shown in FIG. 5 to another exchange, it indexes the input restriction display table 60 from the destination exchange address 201 information of the communication data block, and displays the input restriction display ( FLG)61
If it is displayed as restricted, data block transmission to the data exchange center is stopped and input to the data exchange center is prevented.

In addition, the input restriction display (FLG) 61 is 7° while it is not restricted. If set, the transmission to the corresponding exchange is executed.

〔Effect of the invention〕

According to the present invention, in order for a congestion switching center to regulate input to its own switching center, the data block transmission center autonomously controls congestion without transmitting an input regulation notification signal to the data block transmission switching center. Because it is possible to stop inputting data blocks to an exchange that is in a state of congestion, it is possible to prevent an exchange that is in a congested state from causing further congestion due to the notification of input restrictions to its own station. effective.

In addition, it is possible to use response monitoring timing information for monitoring delivery confirmation of communication data blocks, which is used in conventional data exchange networks, as the count value of response delay time information, without requiring any special equipment, which is economical. It is possible to implement data exchange center input regulations. Further, even when used in combination with a conventional control method in which input restriction notification data signals are transmitted from a comparison exchange and input to the own exchange is restricted, the conventional functions are not impaired in any way.

[Brief explanation of drawings]

Figure 1 is a block diagram showing an example of the configuration of a data exchange network;
Figure (a) is a response delay time measurement table that counts the response delay time corresponding to the last month when the data exchange sent the delay measurement data signal, and Figure 2 (b) shows that data block transmission has been stopped. Input restriction display table, Figure 2 (
c) is a response delay time reference value table for exchanges determined by the data exchange network, FIG. 2(d) is a block diagram showing an example of the configuration of a table indicating transmission stop time, and FIG. Delay measurement response data signal format 1~
4 is a diagram showing the relationship between a delay measurement data signal and a delay measurement response data signal in a data exchange network, and FIG. 5 is a block diagram showing the format of a communication data block. 10...Data exchange network, 11-1n...Data exchange station, 21-2n...Interoffice trunk line, 31-3o...Data terminal.

Claims (1)

[Claims] 1. In a data exchange network, the data block sending station of the data exchange center that makes up the network monitors the timing until it receives a reception acknowledgment signal from the data block receiving station for the data block sent to the destination exchange station. A data exchange network input regulation method characterized in that the transmission of a data block to a data block transmission destination exchange center whose response is delayed for a certain period of time or more determined by the data exchange network is stopped for a certain period of time.