JP2018098620A - Collision prevention method of communication terminal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which transmission timings overlap and collision may easily occur when a plurality of communication terminal devices simultaneously transmit UDP/IP data to one server.SOLUTION: A specific terminal number is provided for each of a plurality of communication terminal devices, time setting of an RTC function is made with time difference in the order corresponding to terminal numbers for fixed-cycle time data, and alarm setting at the RTC function of each communication terminal device is set to a prescribed constant delay time to the fixed-cycle time data. Regarding fixed-cycle data transmitted from each communication terminal device to one server by UDP/IP, data acquired by a lower level apparatus at the time of time data set to the RTC function is transmitted with time difference in the order corresponding to terminal numbers.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a collision prevention method when UDP / IP data is transmitted from a communication terminal device.

  When data is simultaneously transmitted from a plurality of communication terminal apparatuses that perform UDP / IP transmission to one server, a collision (collision) occurs. FIG. 3 shows an outline of data transmission from a plurality of communication terminal devices to one server 3. In FIG. 3, terminal numbers 100 to 199 are shown as an example of the communication terminal device 1, but 0 to 9999 are set. Is done. When the communication terminal device 1 is activated, the time transmission source device 2 transmits the current time from a server or a mobile phone communication module which is a lower device.

In the example of FIG. 3, when the data transmission cycle is 10 minutes, RTCtime: 01: 00: 00 is set in the real-time clock RTC of each communication terminal device 1 by transmitting the time data 01:00:00, Set RTCalarm: 01: 10: 00 in minutes. Each communication terminal device 1 transmits the data of the lower devices at 01:00:00 to the data transmission destination server 3 at the same time at 01:00:00. Collisions are likely to occur during this simultaneous data transmission.
Patent Document 1 is known as a countermeasure for preventing the occurrence of collision.

JP 2003-234744 A

  In the communication system using the communication terminal device 1 shown in FIG. 3, in order to realize low power consumption, when the CPU of the communication terminal device 1 is periodically activated by the RTC and UDP / IP data is simultaneously transmitted to the server 3, Collisions are likely to occur due to overlapping transmission timings. In order to prevent collision, collision does not occur by using TCP / IP without using UDP / IP. However, TCP / IP increases communication data volume and communication charges compared to UDP / IP. Up.

  An object of the present invention is to provide a collision prevention method when UDP / IP is used for data transmission.

The present invention relates to a data transmission method in a communication system in which data is transmitted from a plurality of communication terminal devices having UDP / IP and RTC functions to one server based on time-period data from a time transmission source device. ,
A unique terminal number is provided for each of the plurality of communication terminal devices,
While setting the time of the RTC function with a time difference in order of the terminal number with respect to the time data of the fixed period,
The alarm setting in the RTC function of each communication terminal device is set to a predetermined constant delay time with respect to the time data of the fixed period,
Periodic data transmitted from each communication terminal device to one server by UDP / IP transmits data acquired from a lower-level device at the time data set in the RTC function with a time difference in order of terminal numbers. Is.

In addition, each communication terminal device with a terminal number is
Wake up the CPU in the communication terminal device by an alarm set in the RTC function;
Obtaining data at the current time from a lower-level server or mobile phone communication module;
Setting a set time of the RTC to a transmission time of the periodic data;
Transmitting the data fetched from the lower device to the destination server by UDP / IP as the periodic data;
Setting an alarm in the RTC function and stopping the CPU;
In this case, the periodic data is transmitted.

  As described above, according to the present invention, the UDP / IP collision transmitted from each communication terminal device to the server is reduced. In addition, there is no useless waiting time in the CPU activation time of each communication terminal device, and power consumption can be reduced.

The data transmission function figure of the communication terminal system which shows embodiment of this invention. The signal processing flowchart of a communication terminal device. The data transmission function figure of the conventional communication terminal system.

  FIG. 1 shows an outline of the present invention in which data is transmitted from a plurality of communication terminal devices to one server. The system configuration is the same as in FIG. 3 and the data transmission cycle is the same as 10 minutes. Each terminal device 1 is provided with a unique terminal number, and the RTC time itself is adjusted according to the terminal number with respect to the periodic data (in the example of FIG. 1, a time difference of 1 second for each terminal number). For example, as with an alarm clock, the CPU of the communication terminal apparatus is woken up with a time difference set in units of one minute, and UDP / IP data is transmitted. Note that 1 second of the time difference signal can be adjusted to an arbitrary time such as 100 milliseconds.

  In FIG. 1, when the periodic data is time 01:00:00, the communication terminal device 1 with the terminal number 100 converts the data at 00:59:10 to 00:59:10 at time 01:00:00. Is transmitted to the server 3, and the communication terminal device 1 with the terminal number 150 transmits the data at 01:00:00 at time 01:00:00 to the server 3 as data at time 01:00:00. Further, the communication terminal device 1 with the terminal number 199 transmits data at 01:00:49 at 01:00:49 to the server 3 as data at time 01:00:00.

  If the periodic time data transmitted from the time transmission source device 2 is 01:00:00, the RTC function of the terminal number 100 uses the RTCtime in order to give a time difference of 1 second to the periodic data transmission to the server 3. At 01:00:50, the time signal 01:00:00 is set as the time signal from the time transmission source device 2, and RTCalarm: 01:10:00 is set as the alarm time 10 minutes after 01:00:00.

  In communication terminal device 1 with terminal number 150, time signal 01:00:00 is sent from time transmission source device 2 to RTCtime: 01:00:00 time signal 50 seconds before RTCtime of terminal number 100: 01:00:50. RTCalarm: 01: 10: 00 is set as the alarm time. Similarly, in the communication terminal device 1 with the terminal number 199, the time signal 01:00:00 is sent from the time transmission source device 2 to RTCtime: 01: 00: 00 49 seconds before the RTCtime: 01: 00: 00 of the terminal number 150. Set RTCalarm: 01:10:00. In the example of FIG. 1, it is assumed that a deviation of ± 50 seconds is allowed as data at 01:00:00.

  FIG. 2 shows a flowchart by software of terminal number 100 as an example. In S1, the CPU is woken up at 01:00:00 of the RTC alarm time set in the RTC function of the communication terminal device. In S2, the current time 00:59:10 is acquired from the server or the mobile phone communication module, which is a lower device, and the RTC time is set to 01:00:00 (S3). In S4, each data of analog input and digital input from the lower device is fetched, and the data at 00:59:10 is transmitted to the server 3 by UDP / IP as the periodic data of 01:00:00. In S5, 01:10:00 is set as the RTC alarm, and then the CPU is stopped in S6.

  When the CPU of the communication terminal apparatus is stopped and the RTC alarm time 01:10:00 set in S5 of the next periodic data transmission time is reached, the CPU is woken up (in S7). In S8, the current time 01:09:10 is acquired from the server or the lower device of the mobile phone communication module, and the RTC time is set to 01:10:00 (S9). In S10, the data of the analog input and the digital input from the lower device are taken and the data of 01:09:10 is transmitted to the server 3 by UDP / IP as the periodic data of 01:10:00, and the RTC is transmitted in S11. After setting 01:20:00 as an alarm, the CPU is stopped in S12. The same steps are repeated thereafter.

  As described above, according to the present invention, when data is transmitted from a plurality of communication terminal devices to one server, the RTC time is adjusted according to each communication terminal device to set the RTC alarm time, and the CPU is woken up at the alarm time. And send it to the server via UDP / IP. Thereby, the UDP / IP collision transmitted from each communication terminal device to the server is reduced. In addition, there is no useless waiting time in the CPU activation time of each communication terminal device, and power consumption can be reduced.

DESCRIPTION OF SYMBOLS 1 ... Communication terminal device 2 ... Time transmission origin apparatus,
3. Data transmission destination server

Claims (2)

In a data transmission method in a communication system that transmits data to a single server from a plurality of communication terminal devices having UDP / IP and RTC functions based on time data of a fixed period from a time transmission source device,
A unique terminal number is provided for each of the plurality of communication terminal devices,
While setting the time of the RTC function with a time difference in order of the terminal number with respect to the time data of the fixed period,
The alarm setting in the RTC function of each communication terminal device is set to a predetermined constant delay time with respect to the time data of the fixed period,
Periodic data transmitted from each communication terminal device to one server by UDP / IP transmits data acquired from a lower-level device at the time data set in the RTC function with a time difference in order of terminal numbers. The collision prevention method of the communication terminal device characterized by the above-mentioned. Each communication terminal device to which the terminal number is attached,
Wake up the CPU in the communication terminal device by an alarm set in the RTC function;
Obtaining data at the current time from a lower-level server or mobile phone communication module;
Setting a set time of the RTC to a transmission time of the periodic data;
Transmitting the data fetched from the lower device to the destination server by UDP / IP as the periodic data;
Setting an alarm in the RTC function and stopping the CPU;
2. The method of preventing collision of a communication terminal apparatus according to claim 1, wherein the periodic data is transmitted by using the communication terminal apparatus.

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