JP5306397B2 - Transmission bandwidth control method in supervisory control equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To predict occurrence of delay before data reception, thereby securing a band needed to keep throughput characteristics. <P>SOLUTION: A transmission band control system for a monitoring controller comprises: a reception pattern recording part 700 which generates pattern data containing the transmission time and reception time of received monitoring data, the address of an apparatus being monitored, and the state of the apparatus being monitored, and records the generated pattern data as a reception pattern; a transmission delay determination part 300 which determines whether a transmission delay time exceeds a predetermined value on the basis of the transmission time and the reception time; a transmission delay information recording part 900 which in occurrence of a transmission delay, records pattern data corresponding to monitoring data preceding the generated monitoring data, as a transmission-delay factor pattern; and a pattern comparison part which compares the transmission-delay factor pattern recorded in the transmission delay information recording part with the reception pattern and if both of the patterns match, expands the band width of a transmission path to a concerned terminal station. <P>COPYRIGHT: (C)2013,JPO&amp;INPIT

Description

  The present invention relates to a transmission bandwidth control method in a supervisory control system, and more particularly to a bandwidth control method capable of effectively allocating a limited bandwidth to each terminal station and effectively utilizing the bandwidth.

  In recent years, network applications have been diversified with the development of network technology, and for example, a transmission control system that performs transmission control using an IP network has been developed.

  The transmission control system is formed by a higher-level transmission control device and a plurality of lower-level terminal stations. The transmission control device and the terminal station are connected by an IP network, and a limited band in the IP network is allocated to each terminal station. Communicating. Since the bandwidth used for communication is a limited bandwidth, effective utilization is desired.

  Moreover, in a real-time system such as a transmission control system, data loss and delay are major problems, so it is necessary to ensure time criticality and throughput. For this reason, bandwidth control for the purpose of ensuring QoS (Quality of Service) is necessary.

  In Patent Literature 1, a bandwidth limiting device that limits the bandwidth of each flow based on a set bandwidth set for each packet flow, that is, a packet interval that satisfies each of the set bandwidths is generated, and from the point when packet transmission is completed A bandwidth limiting device for determining the transmission priority of the next packet in each flow based on a comparison between the elapsed time of the packet and the packet interval is shown.

JP 2007-158640 A

  However, according to the prior art, it is necessary to control the bandwidth every time a packet is transmitted, which increases the processing load on the apparatus and lowers the throughput. The present invention has been made in view of such problems, and provides a bandwidth control method capable of suppressing a decrease in throughput.

  In order to solve the above problems, the present invention employs the following means.

A plurality of terminal stations are provided, and each terminal station transmits monitoring data acquired from each monitoring target device to a monitoring control apparatus via a network, and the monitoring control apparatus transmits each terminal station based on the received monitoring data. A monitoring control device for controlling the monitoring target device via,
The monitoring and control device includes:
A reception pattern recording unit for generating pattern data including a transmission time, a reception time, a monitoring target device address and a monitoring target device state of the received monitoring data, and recording the generated pattern data as a reception pattern;
A transmission delay determination unit that determines whether a transmission delay time exceeds a predetermined value based on the transmission time and the reception time;
A transmission delay information recording unit that records pattern data corresponding to the monitoring data preceding the generated monitoring data as a transmission delay factor pattern when a transmission delay occurs;
A transmission delay factor pattern recorded in the transmission delay information recording unit is compared with the reception pattern, and a pattern comparison unit is provided that expands the bandwidth of the communication path with the terminal station when they match.

  Since the present invention has the above-described configuration, it is possible to provide a bandwidth control method that can suppress a decrease in throughput in the monitoring control system.

It is a figure explaining the supervisory control system concerning an embodiment. It is a figure explaining the detail of a monitoring control apparatus. It is a figure explaining the flow of a process from the production | generation of a reception pattern to transmission delay factor pattern recording. It is a figure which shows the data structure example of reception data. It is a figure which shows the data structure example of reception pattern data. It is a figure which shows the data structural example of the reception pattern data recorded on a reception pattern recording part. It is a figure which shows the data structural example of the data memorize | stored in a transmission delay information recording part. It is a figure which shows the data structural example of the data recorded on a zone | band information recording part. It is a figure which shows the example of a process sequence of a reception pattern production | generation part. It is a figure which shows the process sequence example of a pattern comparison part. It is a figure which shows the example of a process sequence of a transmission delay determination part. It is a figure which shows the example of a process sequence of the generation | occurrence | production factor acquisition part. It is a figure which shows the example of a process sequence of a required zone | band calculation part. It is a figure which shows the example of a process sequence of a zone | band control request process part.

  Hereinafter, embodiments will be described with reference to the accompanying drawings. FIG. 1 is a diagram for explaining a monitoring control system according to an embodiment of the present invention. This system performs monitoring control of a power system such as a power plant or a substation.

  The monitoring control device 1 is connected to a plurality of monitoring control target devices 4 (monitoring control target devices 4a to 4n: n is a natural number) via the IP network 3 and the terminal station 2, and monitoring is performed from the terminal station 2. Collect data. Further, the remote monitoring control device 1 is connected to the terminal station 2 (terminal station 2a to terminal station 2n: n is a natural number), and performs monitoring control of the device to be monitored based on the collected monitoring data.

  FIG. 2 is a diagram illustrating details of the monitoring control device. The monitoring control apparatus 1 includes a transmission delay prediction unit 10, a data reception processing unit 20 that performs reception processing of monitoring data from a terminal station, and a band control unit 30 that sets a band for each terminal station. Here, the transmission delay prediction unit 10 predicts a transmission delay, controls a band for each terminal station before the transmission delay occurs, and prevents the transmission delay.

The transmission delay prediction unit 10 includes a reception pattern recording unit (700) that patterns and holds received data, a transmission delay information recording unit (900) that holds delay information when a transmission delay occurs, a terminal station A band information recording unit (800) that records the band allocated to the reception pattern generation unit (100) that patterns received data, a reception pattern recording unit (700) that records patterned reception data,
A pattern comparison unit (200) that compares the data patterns recorded in the reception pattern recording unit (700) and the transmission delay information recording unit (900) to predict the occurrence of transmission delay, calculates the transmission delay time, and the transmission delay is A transmission delay determination unit (300) for determining whether a transmission delay has occurred, a generation factor acquisition unit (400) for acquiring a factor causing the transmission delay, and a necessary bandwidth for calculating a necessary bandwidth required when the transmission delay occurs again The calculation unit (500) includes a bandwidth control request unit (600) that requests securing of a necessary bandwidth before the transmission delay occurs when the transmission delay is predicted.

  Normally, the amount of data received from a terminal station has a constant throughput characteristic that does not exceed the bandwidth allocated to each terminal station. Further, the total bandwidth allocated to each terminal station is smaller than the bandwidth of the IP network.

  FIG. 3 is a diagram for explaining the flow of processing from reception pattern generation to transmission delay factor pattern recording. The reception pattern generation unit 100 generates reception pattern data based on the reception data received by the reception data processing unit 20, and the generated reception pattern is recorded in the reception pattern recording unit 700. The amount that can be recorded in the reception pattern recording unit 700 is variable depending on the system. In FIG. 3, it is set to 3. The recorded data is deleted from the old data.

  When a transmission delay occurs in the reception pattern D generated based on the reception data, the reception pattern recording unit 700 displays the data No. 1 (reception pattern B), data no. 2 (reception pattern C), the reception data is acquired in order, and therefore it is estimated that reception pattern D (transmission delay) has occurred. 1 (reception pattern B), data no. 2 (reception pattern C) is recorded in the transmission delay information recording unit 900 as transmission delay occurrence factor data.

  The pattern comparison unit 200 compares the recorded transmission delay occurrence factor data with the reception pattern data generated based on the newly received reception data, and predicts the occurrence of the reception pattern D (transmission delay occurrence). .

  FIG. 4 is a diagram illustrating an example data structure of received data. The received data includes a fixed part and a variable part. The fixed part (1010) is common to all data, and the variable part (1010) differs depending on the data type (1011). The data type of the fixed part is a fixed part pattern FP (1012), and the data content of the variable part is a variable part pattern CP (1013). A combination of FP and CP is used as pattern data P (1014), which is used for reception pattern generation. Also, the terminal station time is set to ST (1015) and used for reception pattern generation.

  FIG. 5 is a diagram illustrating a data structure example of reception pattern data. The received pattern data (1100) is generated by combining the pattern data P and ST described in FIG. At the time of generation, the reception time RT (1110), which is the reception data received by the monitoring control device, is added. The variable part pattern CP includes the address (word address) of the monitoring target device and the state (position, ON / OFF) of the monitoring target device.

  FIG. 6 is a diagram illustrating a data configuration example of reception pattern data recorded in the reception pattern recording unit (700). Data No. Is a number for individually identifying the recording data. Pattern data P generated from the received data is recorded in the pattern data, terminal station time ST generated from the received data is recorded in the terminal station time, and reception time RT added when generating the reception pattern data is recorded in the reception time. To be recorded.

  FIG. 7 is a diagram illustrating a data configuration example of data stored in the transmission delay information recording unit (900). Transmission delay No. (910) is a number for individually identifying the recorded transmission delay information. The transmission delay factor pattern (920) records a reception pattern when a transmission delay occurs as a factor. The transmission delay pattern (930) records data in which transmission delay has occurred. The transmission delay time (940) records a time when a transmission delay occurs and is delayed by the transmission delay. The necessary control band (950) records a band required when the reception of the transmission delay pattern is predicted. The transmission delay information recording unit (900) is in an empty state at the first activation, but data is sequentially accumulated. Transmission delay No. (910) represents the number of accumulated data.

  FIG. 8 is a diagram illustrating a data configuration example of data recorded in the band information recording unit (800). As shown in the figure, the bandwidth allocated to the terminal station 2 connected to the monitoring control device 1 is recorded.

  With reference to FIGS. 9 to 13, processing until transmission delay information is recorded in the transmission delay information recording unit will be described.

  FIG. 9 is a diagram illustrating an example of a processing procedure of the reception pattern generation unit (100). Processing is started by receiving monitoring data via the data reception processing unit 20. When data is received, a fixed pattern FP is acquired from the received data (S102), a variable pattern CP is acquired from the received data (S102), and pattern data P is generated based on the fixed pattern FP and the variable pattern CP (S103). ). Further, the terminal station time ST is acquired from the received data (S104), the reception time RT is generated (S105), the generated reception pattern is recorded in the reception pattern recording unit (S106), and the reception pattern comparison unit (200) is recorded. Operate and finish the process.

  FIG. 10 is a diagram illustrating an example of a processing procedure of the pattern comparison unit (200). First, it is determined whether one or more pieces of transmission delay information are recorded in the transmission delay information recording unit (900) (S201). Since it is false (no recording) at the time of activation, the operation of the transmission delay judgment unit (300) is shifted to end the processing.

  If the determination result is true (recorded), the pattern recorded in the reception pattern recording unit (700) is acquired (S202) and compared with the transmission delay factor pattern registered in the transmission delay information recording unit ( S203). It is determined whether the patterns do not match (S204). If true (mismatch), the transmission delay determination unit (300) is operated, and if false (match), the band control request unit is operated (S600).

  FIG. 11 is a diagram illustrating a processing procedure example of the transmission delay determination unit 300. First, the terminal time STm of the reception pattern is acquired (S301), the reception time RTm of the reception pattern is acquired (S302), and the transmission delay time T is calculated (S303).

The transmission delay time T can be expressed as T = RTm−STm.

  Next, transmission delay is determined using T (S304). If T is within the threshold (no delay), the process ends. If not within the range (with delay), the transmission delay time is recorded in the transmission delay information recording unit (S306), and the generation factor acquisition unit (400) is operated.

  FIG. 12 is a diagram illustrating a processing procedure example of the generation factor acquisition unit 400. First, the reception pattern No. recorded in the reception pattern recording unit 700 is recorded. m-1 to No. 1 is estimated as a transmission delay factor pattern that causes transmission delay (S401), is recorded in the transmission delay information recording unit 900 as a transmission delay factor pattern (S402), and the necessary bandwidth calculation unit is operated (S500). ).

FIG. 13 is a diagram illustrating a processing procedure example of the necessary bandwidth calculation unit 500. First, the bandwidth B assigned to the terminal station where the transmission delay has occurred is acquired (S501), and the necessary bandwidth NB is calculated from the transmission delay time T and the bandwidth B (S502). Here, the required bandwidth NB is
NB = T × B.

The calculated necessary band NB is recorded in the necessary control band of the transmission delay information recording unit 900 (S504).

  With reference to FIGS. 10 and 14, the flow from transmission delay information recording section creation to transmission delay information prediction and bandwidth control request will be described.

  FIG. 14 is a diagram illustrating a processing procedure example of the bandwidth control request processing unit (600). In the pattern determination (S204), the transmission delay amount of the matched transmission delay factor pattern is predicted, the necessary control band NB of the band necessary for reception without transmission delay is obtained (S601), and the necessary band NB is obtained. In order to ensure, a bandwidth control request is transmitted to the bandwidth controller (S602), and the process is terminated.

  In addition, this invention is not limited to the said embodiment, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment. Each of the above-described configurations, functions, processing units, and processing means may be realized by hardware by designing a part or all of them, for example, by an integrated circuit. Each of the above-described configurations, functions, and the like may be realized by software by interpreting and executing a program that realizes each function by the processor. Information such as programs, tables, and files for realizing each function can be stored in a memory, a recording device such as a hard disk or an SSD (Solid State Drive), or a recording medium such as an IC card, SD card, or DVD.

  Further, the control lines and information lines indicate what is considered necessary for the explanation, and not all the control lines and information lines on the product are necessarily shown. Actually, it may be considered that almost all the components are connected to each other.

As described above, according to the embodiment of the present invention, in the monitoring and control system that regularly transmits and receives data requiring a certain throughput characteristic and time criticality via the IP network,
Specific data (pattern data) is extracted from the received data, the pattern data arranged in the order of reception is recorded as the current pattern (received patterns B, C, D...), And data deviating from a certain throughput characteristic ( When transmission delay occurs due to reception of reception pattern D), it is estimated that there is a deviating factor in the recorded current pattern (reception patterns B and C), and transmission delay occurs in the current pattern. Record as a factor.

  Thereafter, the newly received pattern is compared with the recorded transmission delay factor patterns (reception patterns B and C), and when they match (when reception patterns B and C are received), the deviated data (reception pattern D) Next, it is predicted that a transmission delay will occur, and bandwidth control is performed to ensure a bandwidth necessary for transmission without delay before reception. Thereby, a constant throughput characteristic can be maintained.

  In this way, when data that deviates from a certain throughput characteristic is received, the cause of the data is identified, and the occurrence of the deviated data is predicted before receiving the deviated data, and the throughput characteristic is maintained. Therefore, it is possible to maintain a constant throughput characteristic by controlling the bandwidth to secure the bandwidth necessary for the purpose.

DESCRIPTION OF SYMBOLS 1 ... Monitoring control apparatus 2 ... Terminal station 3 ... IP network 10 ... Transmission delay prediction part 100 ... Reception pattern production | generation part 200 ... Pattern comparison part 600 ... Band control request part 700 ... Reception pattern recording part 900 ... Transmission delay information recording part 920 ... Generation factor pattern 1030 ... Transmission delay time 1040 ... Necessary control bandwidth

Claims (2)

A plurality of terminal stations are provided, and each terminal station transmits monitoring data acquired from each monitoring target device to a monitoring control apparatus via a network, and the monitoring control apparatus transmits each terminal station based on the received monitoring data. A monitoring control device for controlling the monitoring target device via,
The monitoring and control device includes:
A reception pattern recording unit for generating pattern data including a transmission time, a reception time, a monitoring target device address and a monitoring target device state of the received monitoring data, and recording the generated pattern data as a reception pattern;
A transmission delay determination unit that determines whether a transmission delay time exceeds a predetermined value based on the transmission time and the reception time;
A transmission delay information recording unit that records pattern data corresponding to the monitoring data preceding the generated monitoring data as a transmission delay factor pattern when a transmission delay occurs;
A transmission delay factor pattern recorded in the transmission delay information recording unit is compared with the reception pattern, and a pattern comparison unit that expands the bandwidth of the communication path with the terminal station when they match is provided. Transmission bandwidth control method in supervisory control equipment. In the transmission bandwidth control system in the monitoring and control device according to claim 1,
The transmission delay occurs when the comparison result between the transmission delay factor pattern recorded in the transmission delay information recording unit and the reception pattern does not match and the transmission delay determination unit determines that the transmission delay time exceeds a predetermined value. A transmission bandwidth control method in a monitoring control apparatus, wherein pattern data corresponding to monitoring data preceding the monitored data is recorded in a transmission delay information recording unit as a transmission delay factor pattern.

Images