JP5150164B2 - Optimization method of regular communication between client terminal and server - Google Patents

Description

  The present invention relates to data transfer via a network. Specifically, in a network system in which a client terminal and a server are connected, a transmission time attached to data transmitted from the client terminal to the server, The present invention also relates to a technique for controlling the time until the next data transmission of the client terminal based on the reception time of the data server.

  When data is periodically transmitted from a plurality of client terminals to a server via a network, and the data is periodically processed by the server, the data is temporally transmitted at the start of the periodic processing of the data by the server. Ideally, it should be distributed and received by the servers. However, the amount of network traffic increases, and the time required to transmit the data from a plurality of client terminals becomes irregularly long due to the network distance. However, there is a problem that an excessive load is applied to the server that periodically processes the data. There has been a demand for means for solving the situation of the uneven arrival of data to the server.

  As a means for solving the above-mentioned problem, as shown in FIG. 8, a processing server for enabling the client terminal to set an appropriate timeout time according to the load status of the server providing the service 52, a network system including a time server 51 and a client terminal 53 is known (see, for example, Patent Document 1). A specific outline of the known network system is as follows: a client terminal 53 capable of arbitrarily setting a waiting time for a response from a server; a client terminal 53 connected to the client terminal 53 via a network 54; In response to the request, the processing server 52 that provides a predetermined service to the client terminal 53 and the client terminal 53 connected to the client terminal 53 via the network 54, and as a response to the request from the client terminal 53, the processing server 52 A time server 51 that transmits time information related to the waiting time according to the situation to the client terminal 53, and the client terminal 53 sets the waiting time based on the time information transmitted from the time server 51. That's it.

JP 2005-165658 A

  In the case of the known network system, since two types of servers (processing server and time server) are used, software to be developed at the time of construction of the network system increases, and initial cost and management cost at the time of construction are increased. Has the disadvantage of becoming expensive.

As a result of intensive studies to solve the shortcomings of known network systems, a single server controls the transmission times of a plurality of client terminals in accordance with the communication status of the network, whereby the data is sent to the server. Has developed a network system that can decentralize incoming times and periodically process the data. That is, the present invention
In a network system in which multiple client terminals and servers regularly communicate,
Means for transmitting the data when the client terminal transmits data to the server after attaching the data transmission time to the data;
Means for receiving data to which the transmission time of the client terminal is attached, and recording the reception time of the data;
The server includes a means for calculating a time difference from the transmission time and the reception time and transmitting a next data transmission time to the client terminal when the time difference is equal to or larger than a predetermined time difference. In a network system in which a periodic communication is optimized between a server and a plurality of client terminals.
When transmitting data to the server, a client terminal that transmits a transmission time attached to the data; and
A server that calculates a time difference from the transmission time and a reception time of the data server, and transmits the next data transmission time to the client terminal when the time difference is equal to or larger than a predetermined time difference;
It is related with the network system characterized by providing.

The network system of the present invention is composed of a single server and a plurality of client terminals, and since the number of software to be developed is small, the initial cost and management cost at the time of network construction are low.
Furthermore, in the network system of the present invention, it is understood that the communication time associated with the congestion situation due to an increase in network traffic and the length of the network distance between the client terminal / server becomes longer. The time difference between the transmission time and the data reception time of the server can be grasped, and then the next transmission time of the client terminal can be adjusted from the server to be advanced or delayed based on the time difference. Therefore, in the network system of the present invention, data transmission from the client terminal to the server can be performed according to the network communication status, and the reception time of the data at the server can be distributed. Can be kept in.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a configuration example of a network system according to an embodiment of the present invention.

  The network used in the present invention may be any client-server type network, specifically, the Internet.

  FIG. 2 is a functional block diagram illustrating an example of a functional configuration of the server 1 in the present embodiment. As shown in FIG. 2, the server 1 includes a transmission / reception unit 11, a client terminal transmission time storage unit 12, a reception time storage unit 13, a client terminal transmission time setting unit 14, a control unit 15, and a service processing unit 16. As a specific processing function of the service processing unit 16, when the data transmitted from each client terminal 2 is received by the server 1, the server 1 determines that the client terminal 2 is connected to the network. The data from each client terminal 2 is registered in the database provided by the server 1.

  The function of each part of the server 1 will be described. The server 1 receives the data from the client terminals 2 via the network 3 and receives the data at the transmission / reception unit 13, stores the reception time of the data in the reception time storage unit 13, and is attached to the data When the transmission time of the client terminal is stored in the client terminal transmission time storage unit 12, and the client terminal transmission time setting unit 14 meets a predetermined condition based on the time data of the storage units 12 and 13, the client terminal 2 transmits the change of the data transmission time. On the other hand, the received data is periodically processed by the service processing unit 16.

  FIG. 3 is a functional block diagram illustrating an example of a functional configuration of each client terminal 2 in the present embodiment. As shown in FIG. 3, each client terminal 2 includes a display unit 21, an input unit 22, a control unit 23, a transmission time setting unit 24, a transmission time storage unit 25, a service processing unit 26, and a transmission / reception unit 27. Specific processing functions of the service processing unit 26 include changing the value of data transmitted to the server 1 according to the state of each client terminal 2 itself (whether there is an abnormal state, etc.) For example, retry processing when a response is not obtained is executed.

  The function of each part of each client terminal 2 will be described. Each client terminal 2 processes data input from the display unit 21 and the input unit 22 by an operator by the service processing unit 26, and sets the transmission time to the transmission time set by the transmission time setting unit 24 for the processed data. After being attached, the data is transmitted from the transmission / reception unit 27 to the server 1 via the network 3. When the transmission / reception unit 27 receives a change in the data transmission time from the server 1, the data transmission time is changed in the transmission time setting unit 24 after being stored in the transmission time storage unit 25.

  Adjustment of the time between the server 1 and each client terminal 2, which is a precondition for implementing the present invention, is performed for each server 1 or client terminal 2 using an existing technology called NTP (Network Time Protocol). To do. That is, the time adjustment of the server 1 and each client terminal 2 is performed by using commercially available software or self-made software in accordance with a protocol published on the Internet such as the specification RFC1305. 2 in advance, each of the server 1 or each client terminal 2 performs transmission / reception separately at a rate of once a day using an NTP server on the Internet using Coordinated Universal Time (UTC). To the Coordinated Universal Time (UTC).

  FIG. 4 is a flowchart relating to setting of the time relating to data transmission / reception between each client terminal 2 and the server 1 in the network system of the present invention. Specifically, it is composed of the following steps.

  In step S <b> 1, the server 1 stands by until receiving data transmission from each client terminal 2.

  In step S2, the server 1 receives the data to which the transmission time is attached from each client terminal 2, and the reception time of the data server 1 and the transmission time of each client terminal 2 are respectively received by the reception time storage unit 13 and Stored in the client terminal transmission time storage unit 12.

  In step S3, the server 1 calculates the time difference between the stored client terminal transmission time and the data reception time in the client terminal transmission time setting unit 14, and the time difference is compared with the already set average time difference. If it is within the predetermined range, the program is terminated. The average time difference is calculated by averaging the time differences between the last ten transmission times of each client terminal 2 and the data reception time of the server 1. At this time, when the average time difference is calculated, communication time that is extremely longer than other communication times is excluded.

  In step S4, when the time difference calculated in step 3 exceeds a predetermined range compared to the average time difference (for example, the server 1 does not keep up with the periodic processing of the server 1 and the server 1 receives data from the client terminal 2) Server 1 calculates the data transmission time of each client terminal 2 based on the time difference, and transmits the data transmission time to each client terminal 2. Each client terminal 2 that has received the data transmission time transmits data in accordance with the data transmission time.

Next, one embodiment of the network system of the present invention will be shown, and the usefulness of the network system of the present invention will be described more specifically from the viewpoint of a communication diagram.
FIG. 5 is a communication diagram of one embodiment of the network system according to the present invention, which comprises two client terminals (2A and 2B) and the server 1. T1 to T6 are data communication diagrams between the client terminal 2A and the server 1, and T7 to T11 are data communication diagrams between the client terminal 2B and the server 1. The communication diagrams T1 and T7 indicate that the communication state is normal. On the other hand, in the communication diagrams T2 and T8, the time until the server 1 receives the data attached with the transmission time of the client terminal, transmitted from the client terminals 2A and 2B, from the increase in the traffic of the network. Compared to normal communication status, it is a long time. As a result, the reception time of the data 1 of the communication diagram T2 is close to the reception time of the data server from the client terminal 2B (see the communication diagrams T2 and T9, and T4 and T10), and the client terminal 2A And the load on the server 1 that processes the data transmitted from 2B increases.
At this time, the server 1 calculates a time difference from the comparison of the transmission time and the data reception time of the server 1, and if the credit time difference exceeds a predetermined range, the server 1 sends a message to the client terminal 2A. On the other hand, the data transmission time is transmitted (see communication diagram T3). Normally, the time required for the data transmitted from the client terminal 2 on the uncongested Internet to reach the server 1 is approximately 100 ms or less (in the case of communication in Japan). Once generated, the time is more than that. Further, the regular processing is once every 3 to 5 minutes.

  Each client terminal 2 that has received this transmits data to the server 1 at the transmission time transmitted from the server 1 (see communication diagram T5). By this processing, data transmitted from the client terminal 2A and the client terminal 2B is distributed at the reception time of the server 1 (see communication diagrams T5 and T11), and the excessive load of the periodic processing of the server 1 is eliminated. In addition, as a specific example of the periodic processing of the server 1, the client terminal 2 is subjected to determination processing for monitoring the life and death of each client terminal 2 (whether it is connected to the network) and a plurality of continuous periodic processing. When communication from 2 does not come, there is a process for determining that the communication is disconnected from the network for some reason.

  FIG. 6 is a communication diagram of a conventional network system including two client terminals (A and B) and a server C. T51 to T54 are data communication diagrams between the client terminal A and the server C, and T55 to T58 are data communication diagrams between the client terminal B and the server C. Communication diagrams T51 and T55 indicate that the communication state is normal. On the other hand, in the communication diagrams T52 and T6, the time until the data transmitted from the client terminals A and B is received by the server C becomes longer than the normal communication state due to the increase in network traffic. In addition, the time received by the server C is close. As long as the network traffic continues to increase, the situation where the data reception time at the server C is close will continue (see communication diagrams T53 and T57, and T54 and T58), and an excessive load will be imposed on the periodic processing of the server C. Will continue.

  5 and 6, the network system according to the present invention distributes the reception time of the data transmitted from each client terminal 2 by the server 1 in response to the increase in the traffic of the network 3, and the data It is clear that the processing by the server 1 can be properly executed. Further, in the case of FIGS. 5 and 6, the following is clear from the description of two client terminals 2. That is, if the number of client terminals 2 is increased, the number of incoming data to the server 1 increases, or the network is congested even if the network is congested, the data server 1 Since reception can be distributed without being concentrated in time, the load on the server accompanying the regular processing of the data can be kept appropriate.

  Although the number of client terminals is two in FIG. 5, even when the number of client terminals 2 further increases, the concentration of data reception from each client terminal 2 in the server 1 is distributed even in the case of the network system of the present invention. Can do. In other words, the server 1 stores the time interval of the regular data transmission of each client terminal 2 (the time during which no correction is made due to the delay in reception of the server 1 due to an increase in network communication) in the client terminal storage unit of the server 1. ing. Based on the stored data of the time interval, when the reception of data from each client terminal 2 is concentrated on the server 1, the next reception time at which the data concentration from the client terminal 2 occurs is calculated. Therefore, the server 1 gradually increases or decreases the next transmission time with respect to the client terminal 2 randomly selected from the client terminals 2 on which data transmission is concentrated. The reception of data from the terminal 2 can be distributed.

  FIG. 7 is a graph showing the change over time of the number of data received from a plurality of client terminals 2 such as about 100 in the server 1 in one embodiment of the network system of the present invention. In the periodic process 1, it is indicated that there is a time period in which the number of received data from the client terminals 2 at the server 1 is concentrated (P-2) due to an increase in network traffic. Here, the client terminal is configured to transmit data to a time zone (P-1) where the ideal load has a margin with respect to some of the client terminals 2 that transmitted the data received by the server 1 at the time point P-2. 2 transmits the data transmission time from the server 1. As a result, as shown in the periodic process 2, the concentration of the number of received data in the server 1 is somewhat corrected (P-5 and P-6). However, there is still a time period (P-6) in which the concentration of the number of receptions of the server 1 has not been eliminated. In order to eliminate this concentration on P-6, data is transferred to a time zone (time zone corresponding to P-7, that is, P-11) in which the number of data received from the client terminal 2 that is an ideal load has a margin. The transmission time of data is transmitted from the server 1 to the client terminal 2 so as to transmit. As a result of this process, the number of received data 1 from the client terminal 2 of the server 1 can be kept within the number of received ideal loads within the entire period of the regular process 3 (P-9, P-10 and P-10). -11). The server 1 can adjust the reception time of the data 1 transmitted from each client terminal 2 by the network system of the present invention as described above because the server 1 can adjust the next data server 1 from the reception time of the data. This is because the next transmission time of the data of each client terminal 2 can be set by predicting the reception time. The ideal load (for example, a portion surrounded by a dotted line in FIG. 7) differs depending on the capability of the server 1, but the ideal load in the server 1 of the present invention that can maintain the normal operation status of the server 1. In the case of the status of the number of received data and in addition to the transition from the regular process to the next regular process, if there is a delay in the next transmission from the client terminal 2, there is a possibility that the server 1 will not be in time for the next regular process. Considering this, it means that a time zone (for example, P-4, P-8, and P-12) in which no data is received from the client terminal 2 can be set as a time zone of about 10 seconds, for example.

  In the network system of the present invention described above, when the time required for data transmission due to the congestion of communication in the network and the distance between each client terminal 2 / server 1 becomes long, the start time of the periodic processing of the server 1 is not in time, Furthermore, the server 1 adjusts the data transmission time of each client terminal 2 from the server 1 in response to a communication trouble such as the server 1 being unable to receive data from the client terminal 2. Can be prevented in advance.

FIG. 1 is a block diagram showing an outline of the network system of the present invention. FIG. 2 is a block diagram of a server used in the present invention. FIG. 3 is a block diagram of a client terminal used in the present invention. FIG. 4 is a flow chart relating to setting of time relating to data transmission / reception between the client terminal and the server in the network system of the present invention. FIG. 5 is a communication diagram of the network system of the present invention composed of two client terminals and a server. FIG. 6 is a communication diagram of a conventional network system composed of two client terminals and a server. FIG. 7 is a graph showing the change over time of the number of received data from a large number of client terminals 2 in the server 1 in the network system of the present invention. FIG. 8 is a schematic diagram of a conventional network system.

Explanation of symbols

1: server 2: client terminal 3: network 11: transmission / reception unit 12: client terminal transmission time storage unit 13: reception time storage unit 14: client terminal transmission time setting unit 15: control unit 16: service processing unit 21: display unit 22 : Input unit 23: control unit 24: transmission time setting unit 25: transmission time storage unit 26: service processing unit 27: transmission / reception unit

Claims (1)

And a plurality of client terminals, and a server to periodically process the data received from the client terminal in a network system for performing periodic communication,
When the client terminal transmits data to the server, a procedure for transmitting the data after attaching the data transmission time to the data;
The server, the procedure sending time of the client terminal receives the accompanying data, and records the reception time of the data,
The server calculates a time difference from the transmission time and the reception time, and when the time difference is equal to or larger than a predetermined time difference, a procedure for transmitting a next data transmission time to the client terminal ,
The method for optimizing regular communication, characterized in that the next data transmission time is set in a time zone in which the number of received data from the client terminal falls within the ideal load range of the server .

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