JPH02113654A - Communication equipment - Google Patents

Abstract

PURPOSE:To omit the calculation of a delay time every transmission path and the troublesome setting of a parameter at the time of generating a system by determining a time-out time based on a practically measured transmission delay time. CONSTITUTION:The transmission time of the final octet of transmitted information frames is stored into a storage part 3, and the reception time of the top octet of transmission confirming frames is stored into a storage part 6. The time difference between the reception time and the transmission time is calculated, based on the time difference, the time-out time is updated to the optimum value. That the transmitted frame arrives in the updated time-out time is supervised by a supervising means 9. Consequently, the difference of the transmission delay time due to the difference of network constitutions is corrected, the transmission efficiency by means of the time-out time fit for each network constitution is improved, the resetting of the time-out value at the time of switching a line to an alternate line at the time of a transmission path fault is made unnecessary, and the operation is facilitated. Thus, the troublesome calculation of the delay time at every transmission path and the parameter setting at the time of generating the system are obviated.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention addresses transmission delays caused by differences in network configurations such as transmission equipment, repeaters, procedure conversion devices, communication satellites, etc. installed between speakers who transmit data. When there is a difference in time,
The present invention relates to means for optimizing the timeout period for confirming delivery within a predetermined time after transmitting an information frame.

〔overview〕

The present invention provides a means for determining the timeout time for determining the normality of the transmission delay time of a communication system, by determining the timeout time based on the actually measured transmission delay time, and calculating the delay time for each transmission path. This eliminates the hassle of setting parameters when creating a system.

[Conventional technology]

Conventionally, the timeout time was calculated in advance for each communication route and the parameter was manually given before confirming communication, or the parameter was set to a sufficiently unique value for each route, or the timeout time was It was a unique decision.

[Problem that the invention seeks to solve]

Among these conventional methods, methods in which transmission control procedures are uniquely determined depending on the type of transmission control procedure have the disadvantage that some transmission control procedures cannot be applied depending on the network configuration, or require modification of software or fur. In addition, the method of providing parameters requires troublesome calculations, and the validity of the provided parameters must be confirmed during operational testing, which has the drawback of complicating the procedure. moreover,
The method of giving a sufficient unique value to any route has the disadvantage that the retransmission timing of the information frame is delayed when a timeout occurs, impairing transmission efficiency.

The present invention aims to eliminate such drawbacks, and aims to provide a communication device having means for automatically determining the tight-out time of the entire transmission path.

[Failure to solve the problem]

The present invention provides a monitoring means that compares the time elapsed from the time when an information frame is transmitted to a communication partner station to the time when the communication partner station receives a delivery confirmation frame sent out in response to the information frame with a timeout period. A communication device comprising a first storage means for storing first time information related to the time when the information on the specific position of the information frame was transmitted, and a communication device that receives the information on the position corresponding to the specific position of the delivery confirmation frame. a second storage means for storing second time information related to time; a transmission delay time calculation means for calculating third time information of the difference between the first time information and the second time information; and the third time information. and an optimum value determining means for determining the optimum value of the timeout period based on the following.

[Effect]

The transmission time of the last octet (or last character) of the transmitted information frame is stored in the storage unit.

It also stores the reception time of the first octet (or first character) of the delivery confirmation frame in the storage unit.

The time difference between the reception time and the transmission time is calculated, and the timeout period is updated to the optimum value based on this time difference. The monitoring means monitors whether the delivery frame arrives within this updated timeout period.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings. 1st
The figure is a block configuration diagram showing the configuration of this embodiment.

In this embodiment, as shown in FIG.
, a reception time storage section 5 , a reception time storage section 6 , a transmission delay time calculation section 7 , an optimum value determination section 8 , a monitoring section 9 and a line end device 10 .

In this embodiment, the timeout is the time that has elapsed from the time when the information frame was sent to the communication partner station 11 to the time when the delivery confirmation frame sent by the communication partner station 11 in response to this information frame was received. monitoring means 9 for comparing with time; transmission time storage means 2 and transmission time storage section 3 which are first storage means for storing first time information related to the time when the last information of the information frame was transmitted; and the delivery confirmation. Based on the reception time storage means 5 and the reception time storage section 6, which are second storage means for storing second time information related to the time when the head information of the frame was received, and the first time information and the second time information. Transmission delay time calculation means 7 for calculating third time information related to transmission delay time;
and optimum value determining means 8 for determining the optimum value of the timeout period based on the third time information.

Next, the operation of this embodiment will be explained. The transmitting means 1 is activated based on the information frame transmission request, and the line terminating device 1
0 to the communication partner station 11 (step 511). After sending out the information frame, the transmission time storage means 2 is activated (step 512), and the monitoring means 9 for monitoring reception of the delivery confirmation frame is activated (step 51).
3). The transmission storage means 2 activated in step S12 transmits the time read out in step S21 (stores it in the i time storage section 3 (step 522). The delivery confirmation frame sent from the communication partner station 11 is sent to the reception means 4 The first octet 7) of the delivery confirmation frame is received (step 531), and the reception time storage means 5 is activated (step 532). After the second and subsequent octets of the delivery confirmation frame are received (step 333), it is determined whether the received frame is a delivery confirmation frame (step 534). When the determination result is a delivery confirmation frame, the transmission delay time calculation means 7 is activated (step 535). The reception time storage means 5 activated in step 332 first reads out the time (step 541),
The reception time is stored in the reception time storage unit 6 (step 542), and the monitoring means 9 stops monitoring the timeout (step 543). The transmission delay time calculation section 7 activated in step S34 calculates the timing from the reception time l'ii 200 million section 6 to the reception time t.
Step 551) to read out the transmission time t1 from the transmission time storage section 3; step 552) to read out the transmission time t1 from the transmission time storage section 3;
The time difference between the reception time t2 and the transmission time t1 is calculated (step 553), the result t8 is notified to the optimum value determining means 8 (step 554), and the optimum value determining means 8 is activated (step 555). The optimum value determining means 8 performs step 3.
Step 561)
, determine the optimum value of the timeout time based on this value (step 562), and notify the monitoring means 9 of the optimum value (step 563). The monitoring means 9 monitors the timeout using the optimum value notified in step S63 when the monitoring means 9 is activated by the transmitting means 1.

FIGS. 8 and 9 show an algorithm for determining the optimum value of the timeout period in step S62.

Here, time 1. The relationship <time t2<<time tl is maintained.

〔Effect of the invention〕

As explained above, the present invention transmits an information frame,
The transmission delay time until receiving the response S-frame is calculated, and the timeout time is optimized based on the calculation result. 7) Transmission efficiency is improved by using a timeout period suitable for the work configuration, and ■
There is no need to reset the timeout value when switching to an alternative line in the event of a transmission line failure, which simplifies operation. ■ Effects that eliminate the need for cumbersome calculations of delay times for each transmission line and parameter settings when creating a system. There is.

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a flowchart showing the operation of the transmitting means in FIG. FIG. 3 is a flowchart showing the operation of the transmission time storage means in FIG. 1. FIG. 4 is a flowchart showing the operation of the receiving means in FIG. FIG. 5 is a flowchart showing the operation of the reception time storage means in FIG. FIG. 6 is a flowchart showing the operation of the transmission delay time calculation means in FIG. FIG. 7 is a flowchart showing the operation of the optimum value determining means in FIG. 1. 8 and 9 are flowcharts showing details of the optimum value determination algorithm in FIG. 7. 1... Transmission means, 2... Transmission time storage means, 3...
- Transmission time storage section, 4... Receiving means, 5... Reception time storage section, 6... Reception time storage section, 7... Transmission delay time calculation means, 2.. Optimum value determining means, 9 . . . Monitoring means, 10 . . . Line termination device, 11 . . . Communication partner station.

Claims (1)

[Claims] 1. Compare the time elapsed from the time when the information frame is transmitted to the communication partner station to the time when the delivery confirmation frame sent by the communication partner station is received in response to this information frame with the timeout time. a first storage means for storing first time information related to the time at which the information at the specific position of the information frame was transmitted; a second storage means for storing second time information related to the time at which the information was received; a transmission delay time calculation means for calculating third time information of the difference between the first time information and the second time information; A communication device comprising: optimum value determining means for determining an optimum value of a timeout period based on third time information.