KR20210014853A - Method of adaptively adjusting transmission period of wireless terminal and wireless network system for the same - Google Patents

Abstract

According to the present invention, disclosed is a method of adjusting a transmission cycle of a wireless terminal transceiving data with a monitoring server. According to the present invention, the transmission cycle adjustment method includes: a step wherein a wireless terminal creates transmission standby data; a step wherein the wireless terminal calculates a data variation rate by comparing the transmission standby data with previous data transmitted on a previous cycle; and a step wherein the wireless terminal adjusts a transmission cycle in accordance with the data variation rate. According to the present invention, as the transmission cycle of a terminal forming an LPWA network is variously changed in accordance with a data variation rate, a reception time pattern and the like, the probability of a data collision caused by simultaneous reception in a gateway or the like can be significantly reduced. Therethrough, since a data loss rate is considerably lowered, the performance and management efficiency of an LPWA network can be improved to improve an overall service quality, and make network management more convenient.

Description

Method of adaptively adjusting transmission period of wireless terminal and wireless network system for the same

The present invention relates to a method of adjusting a transmission period of a wireless terminal, and specifically, by adaptively adjusting the transmission period of a wireless terminal constituting a network using a data change rate and a reception time pattern, data loss due to simultaneous reception at a gateway, etc. It's about how you can prevent it.

Recently, as the Internet of Things (IoT), which connects various objects with sensors and communication functions to each other through the Internet, emerges as a new future industry, research and development on related technologies and services are being actively conducted.

IoT is based on wireless communication between objects and objects, and between objects and base stations, and because communication environments and coverage vary according to service types, short-range wireless communication and long-range wireless communication are used in combination or selectively.

Short-range wireless communications such as Z-wave, Zigbee, and BLE (Bluetooth Low Energy) are mainly used for home and office services, and services such as remote monitoring and meter reading are LTE-M and NB. -Low Power Wide-Area (LPWA) communications such as Iot (NarrowBand-Internet of Things) and LoRa (Long Range Wide Area Network) are mainly used.

LTE-M is a communication standard prescribed by the Mobile Communication Standardization Organization (3GPP), and since the existing LTE network can be used, wide area service of about 15km and high-speed communication of 1Mbps are possible. Recently, LTE Cat, which has significantly reduced power consumption compared to the existing LTE-M. M1 has been defined through Release 13.

NB-IoT is a communication standard defined by the Mobile Communication Standardization Organization (3GPP) through Release 13, and LTE Cat. It has different characteristics from M1, can support a wide area service of 10 km or more, and data transmission speed is about several hundred kbps.

LoRa uses an unlicensed band frequency of about 900 MHz and transmits small data at a speed of about 0.3 kbps to 50 kbps, so power consumption is very low, and service coverage of about 10 km in cities and 15 km in rural/suburban areas. Have.

This LPWA communication technology is also used in the case of transmitting and receiving data between a monitoring server and a wireless console installed in each node in order to monitor the status of each node of a wireless mesh network.

Meanwhile, a network in which multiple terminals are connected through LPWA communication is called an LPWA network. In other words, the LPWA network includes a number of terminals that periodically transmit data, a monitoring server that receives data from a number of terminals to monitor the terminal or its surroundings, and communicates between the terminal and the monitoring server while communicating wirelessly with each terminal. It may include a gateway that relays.

When establishing an LPWA network, an uplink transmission period should be set for each terminal, and at this time, the transmission period of each terminal should be set so that the transmission period of each terminal does not overlap with each other.

This is because, in the current LPWA communication standard, if data transmitted from multiple terminals reach the gateway at the same time, data may be lost due to collision. Specifically, if the first receiver receiving the first data transmitted by the first terminal at the gateway and the second receiver receiving the second data transmitted by the second terminal at the gateway overlap, both data will be It can be lost.

Once this data collision occurs, it has no choice but to continue to occur repeatedly, and thus the possibility of collision must be eliminated by distributing the uplink transmission period as much as possible from the network establishment stage.

However, if the number of terminals installed or the amount of data increases, the possibility of the transmission periods of the terminals overlapping with each other increases, and it is difficult to completely prevent the phenomenon that the transmission periods overlap because there are many cases of retransmission because the gateway cannot receive data. there is a problem.

In addition, when a data collision occurs due to overlapping transmission periods, there is a problem in that a considerable amount of time and manpower must be invested in re-adjusting the transmission period by finding a terminal with overlapping transmission periods.

Recently, in order to solve such a problem, a method of automatically changing a transmission period by a terminal has been proposed.

For example, Patent Document 1 proposes a method of determining the transmission time of the next uplink packet by using the equation Tnext UL = K+P-L-M when the downlink is successfully received after transmitting the uplink packet. Here, Tnext UL is the transmission time of the next uplink packet, K is the start time of the downlink section (DL1 or DL2) that has been successfully received, P is the previously set uplink period, and L is the previously set uplink section (UL). And M is the time interval between the uplink section (UL) and the first downlink section (DL1).

However, in the equation of Patent Document 1, only K is a variable, and all of P, L, and M are fixed constants, and if a downlink packet is not received during two downlink periods (DL1 or DL2), the above equation is not applied. Since it retransmits in the next transmission period set, the variation width of the transmission period is too limited.

Specifically, as illustrated in FIG. 1(a), when the initially set transmission period (P) is 10 seconds, when all downlink packets are successfully received every first downlink period (DL1), FIG. As shown in b), the transmission period calculated by the equation is unchanged 10 seconds.

In addition, when all of the first downlink period (DL1) fails and all of the downlink packets are successfully received in the second downlink period (DL2), the transmission period calculated by the equation is 12 as shown in FIG. 1(c). It becomes a second.

In addition, when the reception succeeds first in DL1 and then in DL2, transmission periods of 10 seconds and 12 seconds are calculated by equations as shown in Fig. 1(d).

That is, the method of Patent Document 1 is to select one of two transmission periods (10 seconds, 12 seconds) according to the interval in which the downlink packet is successfully received, so the variation is too small and limited, so the number of terminals is large. There is a limit to adaptively adjusting the transmission period in the network.

Korean Patent Publication No. 10-2019-0014944 (published on February 13, 2019)

The present invention was devised from this background, and an object of the present invention is to significantly reduce the possibility of data collision in a gateway or the like by allowing the transmission period of a terminal constituting an LPWA network to be adaptively adjusted over a wide range.

In order to achieve this object, a first aspect of the present invention provides a method for adjusting a transmission period of a wireless terminal transmitting and receiving data with a monitoring server, the method comprising: generating, by the wireless terminal, data to be transmitted; Calculating, by the wireless terminal, a data change rate by comparing the data to be transmitted and the immediately preceding data transmitted in the immediately preceding period; It provides a method for adjusting a transmission period of a wireless terminal, comprising the step of the wireless terminal adjusting a transmission period according to a data change rate.

In the transmission period adjustment method according to the first aspect of the present invention, in the step of adjusting the transmission period, the increase/decrease width of the transmission period may be differentiated according to the size of the data change rate.

In addition, in the transmission period adjustment method according to an aspect of the present invention, in the step of adjusting the transmission period, if the data fluctuation rate falls within the set range, the previous period is applied as it is, and if the data fluctuation rate is less than the set range, the transmission period is changed to the previous period. If the data change rate is larger than the setting range, the transmission period can be changed shorter than the previous period. At this time, if the data change rate exceeds the threshold, it can be changed to the shortest transmission period.

Further, in the method of adjusting the transmission period according to the first aspect of the present invention, in the step of calculating the data change rate, the rate of change of the value classified by the classification code Od compared to the data packet of the data to be transmitted and the data packet of the immediately preceding data. After calculating each value individually, the rate of change of each value can be summed.

In addition, in the transmission period adjustment method according to the first aspect of the present invention, if a transmission period change command is received from the monitoring server after the transmission period adjustment step, the transmission period may be adjusted again in response to the transmission period change command. .

A second aspect of the present invention is a method of adjusting a transmission period of a wireless terminal transmitting and receiving data to and from a monitoring server in a monitoring server, the method comprising: receiving, by the monitoring server, data from a plurality of wireless terminals; Determining whether a data collision has occurred and a wireless terminal causing a data collision; If data collision is confirmed, analyzing a data reception time pattern for a set period to confirm a non-reception section; Determining a new transmission period of the wireless terminal causing the collision, and determining that the new transmission period falls within the non-reception period; It provides a method for adjusting a transmission period of a wireless terminal comprising the step of transmitting a transmission period change command together with a newly determined transmission period to a wireless terminal causing a collision.

In the transmission period adjustment method according to the second aspect of the present invention, data transmitted from a plurality of wireless terminals are received by a gateway and transmitted to a monitoring server, and the monitoring server analyzes the data received from the gateway to determine whether there is a data collision or not. You can check the generated wireless terminal.

In addition, in the transmission period adjustment method according to the second aspect of the present invention, after the step of transmitting the transmission period change command together with the newly determined transmission period to the wireless terminal that caused the collision, the wireless terminal receiving the transmission period change command Changing the transmission period in response; Generating, by the wireless terminal, data to be transmitted; Calculating, by the wireless terminal, a data change rate by comparing the data to be transmitted and the immediately preceding data transmitted in the immediately preceding period; It may include adjusting the transmission period according to the data change rate.

A third aspect of the present invention provides a computer-readable recording medium in which a program for implementing the transmission period adjustment method described above is recorded.

A fourth aspect of the present invention is a wireless terminal that transmits and receives data to and from a monitoring server, comprising: a data acquisition unit that collects data to be transmitted to a monitoring server and generates data to be transmitted; A transmission data analysis unit for calculating a data change rate by comparing the data to be transmitted and the immediately preceding data transmitted in the immediately preceding period; And a transmission period determining unit that determines whether or not to increase or decrease the transmission period and an increase or decrease width using the calculated data change rate.

A fifth aspect of the present invention is a monitoring server that transmits and receives data to and from a plurality of wireless terminals, comprising: a data collision determination unit that checks whether a data collision has occurred due to simultaneous reception and a wireless terminal that has caused a data collision; When a data collision is confirmed, a reception data analysis unit that analyzes a data reception time pattern for a set period to check a non-reception section; It provides a monitoring server including a transmission period determining unit that determines a new transmission period of a wireless terminal causing a collision, and determines that the new transmission period falls within the non-reception period.

A sixth aspect of the present invention provides a wireless network system including the wireless terminal and a monitoring server described above.

According to the present invention, the possibility of data collision due to simultaneous reception at a gateway or the like can be drastically reduced by variously changing a transmission period of a terminal constituting an LPWA network according to a data change rate and a reception time pattern.

Through this, the data loss rate is greatly reduced, so that the performance and operation efficiency of the LPWA network are improved, so that the service quality can be improved overall, and the network management is more convenient.

1 is a diagram illustrating a conventional transmission period adjustment method
2 is a diagram illustrating a configuration of an LPWA network
3 is a block diagram illustrating the configuration of an LPWA terminal
4 is a block diagram illustrating a configuration of a monitoring server
5 is a flowchart showing a method for adjusting a transmission period according to the first embodiment of the present invention
6A and 6B are diagrams illustrating a method of calculating a data change rate
7 is a diagram showing how the transmission period is adjusted according to the data change rate
8 is a diagram illustrating contents of adjustment by differentially adjusting a transmission period according to a data change rate
9 is a flowchart showing a method for adjusting a transmission period according to a second embodiment of the present invention
10 is a diagram showing a state of adjusting a transmission period according to a second embodiment of the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

For reference, in the present specification, when one element is connected, combined, or communicated with another element, not only the case of direct connection, coupling, or communication with another element, but also the other element in the middle This includes cases of indirect connection, association, or communication over and over. In addition, when one component is directly connected or directly coupled to another component, it means that no other component is intervened. In addition, when a certain part includes or includes a certain component, it means that other components may be further included or provided, rather than excluding other components, unless specifically stated to the contrary. In addition, since the drawings attached to the present specification are merely illustrative for easy understanding of the subject matter of the invention, it should be noted in advance that the scope of the present invention is not limited thereto.

The LPWA network according to an embodiment of the present invention, as illustrated in FIG. 2, includes a plurality of terminals 100 that periodically transmit data, and gateways 210 and 220 that perform LPWA communication with the plurality of terminals 100. , And a monitoring server 400 connected to the gateways 210 and 220 through the Internet 300 and the like.

The terminal 100 according to an embodiment of the present invention, as illustrated in the block diagram of FIG. 3, includes a processor 110, a memory 120, a data acquisition unit 130, a wireless communication unit 140, a bus ( 190) and the like.

The processor 110 executes a computer program stored in the memory 120 to perform a predetermined operation or data processing.

The memory 120 may include non-volatile memory (eg, flash memory, etc.) and volatile memory (eg, random access memory (RAM)). The memory 120 includes a computer program for operating the terminal 100, and various kinds of devices. A computer program may store parameters, data, etc. A computer program is a set of instructions executed by the processor 110 and may include an operating system, middleware, an application, or an application programming interface (API). Can be stored in non-volatile memory and loaded into volatile memory to be executed.

In an embodiment of the present invention, a transmission period adjustment program for automatically adjusting the transmission period of the terminal 100 may be stored in the memory 120. The transmission period adjustment program may include a transmission data analysis unit 122, a transmission period determination unit 124, and the like if functionally classified.

The memory 120 may store data and commands generated or received by the processor 110, the data acquisition unit 130, the wireless communication unit 140, and the like. In addition, the memory 120 may store data and commands generated by the transmission data analysis unit 122 and the transmission period determination unit 124.

Meanwhile, the means for adjusting the transmission period of the terminal 100 does not necessarily have to be implemented in software, and at least one or some functions of the transmission data analysis unit 122 and the transmission period determination unit 124 may be implemented in hardware. , It may be implemented as a combination of software and hardware. In this case, the hardware may be an application specific integrated circuit (ASIC).

The transmission data analysis unit 122 calculates a data change rate by comparing the data waiting to be transmitted with the data transmitted in the previous period.

The transmission period determining unit 124 determines whether or not the transmission period is increased or decreased by using the calculated data change rate. For example, if the data fluctuation rate is within the set range, the previous transmission period is applied as it is to transmit data, and if the data fluctuation rate is less than the set range, there is little data fluctuation, so it is judged that the need for rapid transmission is low. If it is set longer and the data change rate exceeds the setting range, the data fluctuation is severe, so it is determined that the need for prompt delivery to the monitoring server 400 is large, and the transmission period is set shorter than the previous period. At this time, it is desirable to apply the increase/decrease differentially according to the size of the change rate.

The data acquisition unit 130 collects measurement data from a sensor (not shown in the drawing) connected to the terminal 100, or collects status information of the corresponding electronic device from another electronic device connected to the terminal 100, or Measurement data collected by other electronic devices connected to 100) can be collected.

The wireless communication unit 140 performs LPWA communication with the gateways 210 and 220, and the LPWA communication method is not limited. For example, communication methods such as LTE-M, NB-Iot (NarrowBand-Internet of Things), and LoRa (Long Range Wide Area Network) can be used without limitation, and new low-power wide area communication technologies introduced in the future may be used. Of course.

The bus 190 transmits electrical signals between the components 110, 120, 130, and 140 of the terminal 100, and may be a cable or a circuit pattern.

In addition, although not shown in the drawings, the terminal 100 may further include a wired communication unit for connection with other devices, a short-range wireless communication unit such as WiFi and Zigbee. In addition, the terminal 100 may include an input means such as a keypad and a touch screen, or may include a display for displaying a status.

The gateways 210 and 220 relay communication between the plurality of terminals 100 and the monitoring server 400, and transmit uplink data received from the plurality of terminals 100 to the monitoring server 400, and monitor Downlink data received from the server 400 is transmitted to the terminal 100.

When transmitting the data received from the terminal 100 to the monitoring server 400, the gateways 210 and 220 transmit gateway identification information together, and through this, the monitoring server 400 determines through which gateways 210 and 220 specific data was received. I can confirm.

In addition, the gateways 210 and 220 transmit the header information of the uplink data temporarily stored in the buffer memory, etc. to the monitoring server 400 together with the gateway identification information, even when data is lost due to the overlapping of the two uplink data reception times. desirable.

Since the header of the uplink data includes the identification information of the terminal, the monitoring server 400 can use this to determine which terminal of the terminal in which the data collision occurred first reached the gateways 210 and 220.

In the current LPWA communication standard, when data collision occurs, all data including headers is lost for all data other than the first received data. Except for the information of the other terminals, it is not possible to check the information of the terminal, but the information of the initially received terminal can be checked through the data header.

When the first receiving terminal causing the data collision is identified as described above, the monitoring server 400 may change the transmission period by sending a transmission period change command to the corresponding terminal, thereby preventing subsequent collisions.

It goes without saying that the number of gateways 210 and 220 varies depending on the network coverage, so the number of gateways 210 and 220 is not limited to two as shown in the drawing.

The monitoring server 400 according to an embodiment of the present invention may include a processor 410, a memory 420, a communication unit 430, a bus 490, and the like, as illustrated in the block diagram of FIG. 4. have.

The processor 410 executes a computer program stored in the memory 420 to perform a predetermined operation or data processing.

The memory 420 may include non-volatile memory (eg, flash memory, etc.) and volatile memory (eg, random access memory (RAM)). The memory 420 is a computer program for operating the monitoring server 400, Various parameters and data can be saved.

In an embodiment of the present invention, a transmission period adjustment program for automatically adjusting the transmission period of the terminal 100 may be stored in the memory 420 of the monitoring server 400.

The transmission period adjustment program installed in the monitoring server 400 may include a data collision determination unit 422, a reception data analysis unit 424, a transmission period determination unit 426, and the like, functionally classified.

The memory 420 may store data and commands generated or received by the processor 410 and the communication unit 430. In addition, the memory 420 may store data and commands generated by the data collision determination unit 422, the reception time pattern analysis unit 424, and the transmission period determination unit 426.

Meanwhile, the means for adjusting the transmission period of the terminal 100 is not necessarily implemented in software, and at least one of the data collision determination unit 422, the reception time pattern analysis unit 424, and the transmission period determination unit 426 or Some functions may be implemented in hardware, or a combination of software and hardware. In this case, the hardware may be an application specific integrated circuit (ASIC).

The data collision determination unit 422 checks whether there is data that has received only the header among the received uplink data, and if there is data that has only received the header, it extracts the information of the terminal 100, and the corresponding terminal causes a data collision. Judged by

When a data collision is confirmed by the data collision determination unit 422, the reception time pattern analysis unit 424 analyzes the reception time pattern using data reception information for a set period (eg, 10 minutes immediately before). By analyzing the reception time pattern, the gateways 210 and 220 can determine a reception section in which signals from the multiple terminals 100 are received and a non-reception section in which no signal is received.

The transmission period determining unit 426 extracts the unreceived section in which the signal of the terminal 100 is not received from the gateways 210 and 220 using the analysis result of the reception time pattern, and the terminal 100 causing a collision within the unreceived section Determine a new transmission period.

The communication unit 440 communicates with the gateways 210 and 220 through the Internet 300 or the like, and the communication method is not limited. The bus 490 transmits electrical signals between the components 110, 120, 130, and 140 of the server 400, and may be a cable or a circuit pattern.

The monitoring server 400 may further include various types of communication interfaces for communication with other devices. In addition, the monitoring server 400 may further include an input means for user manipulation and a display for status display.

Hereinafter, a method for adjusting a transmission period according to a first embodiment of the present invention will be described with reference to the flowchart of FIG. 5. This method is a method in which the terminal 100 actively adjusts the transmission period based on the data change rate.

First, in the plurality of terminals 100 constituting the LPWA network, a transmission period is set so that the transmission periods of each terminal 100 do not overlap each other when a network is established. (ST11)

Therefore, each terminal 100 collects data through the data acquisition unit 130 to generate data to be transmitted, and then transmits the data to be transmitted to the gateways 210 and 220 when the next transmission period arrives, and the transmitted data is It is transmitted to the monitoring server 400 through 210 and 220). (ST12)

Subsequently, the terminal 100 acquires data through the data acquisition unit 130 in order to generate new data to be transmitted. (ST13)

Subsequently, the transmission data analysis unit 122 of the terminal 100 compares the immediately preceding data transmitted in the immediately preceding period and the data waiting to be transmitted to calculate a data change rate.

The rate of data change can be calculated in several ways. For example, as shown in Figs. 6(a) and 6(b). The rate of change can be calculated by comparing each byte of the data packet of the immediately preceding data and the data packet of data to be transmitted.

Figure 6(a) is. If the main data between the header and the tail of the data packet contains three values that are distinguished from each other by the identification code (0d), the first and third values differ by 0.06% and 5.5%, respectively, so add them to make the total change rate 5.56. It is a diagram illustrating the case of calculating in %.

Figure 6(b) shows the total rate of change by adding these values when the three values differ by 247%, 0.88%, and 20.5%, respectively, when the present data includes three values that are distinguished from each other by a classification code (0d). Is a diagram illustrating a case of calculating as 268.38.

On the other hand, the classification code 0d illustrated in FIGS. 6A and 6B is merely an example, and it is a matter of course that the type of the classification code may vary. In some cases, the identification code may be omitted.

In addition, the method of calculating the data change rate is not limited to a method of comparing values between classification codes, and the change rate may be calculated by any number of other methods. For example, the number of bits having a difference compared to binary bits may be reflected in the data change rate. (ST14)

Subsequently, the transmission period determining unit 124 of the terminal 100 determines a new transmission period of the terminal 100 after the data change rate is calculated, and transmits the transmission waiting data according to the determined transmission period.

At this time, it is first checked whether the data change rate falls within the set range (e.g., 4% ~ 6%), and if it falls within the set range, it is regarded as a general situation and the transmission period is not changed as shown in Fig. 7(a). Data waiting to be transmitted can be transmitted by applying the previous transmission period as it is. (ST15, ST16)

If the data change rate is less than the set range, i.e., less than 4%, there is little data change, so it is judged that the need for rapid transmission is low, and the transmission period is changed longer than the previous period as shown in Fig. 7(b). By doing so, the data waiting to be transmitted can be transmitted.

When increasing the transmission period, it can be increased by differentiating it according to the size of the data change rate. For example, as shown in FIG. 8, if the data fluctuation rate is 1% or more and less than 4%, the transmission period may be increased by 1 step compared to the previous period, and if the data fluctuation rate is less than 1%, the transmission period may be increased by two steps compared to the previous period. .

In the embodiment of the present invention, the transmission period is divided into a total of 20 steps, and the length of each step is set to 1 minute, but the number of transmission periods and the length of each step may be set differently according to specific circumstances. (ST17, ST18, ST20)

On the other hand, if the data change rate exceeds the set range, i.e., if the change rate is 6% or more, it is determined that the need for rapid delivery is large as a case of severe data fluctuation, and the transmission period is set to be longer than the previous period as shown in Fig. 7(c). It can be changed shortly to transmit the data waiting to be transmitted.

When reducing the transmission period, it can be increased by differentiating it according to the size of the data change rate. For example, as shown in FIG. 8, when the data change rate is 6% or more and less than 10%, the transmission period may be reduced by one step, and when the data change rate is 10% or more and less than 20%, the transmission period may be reduced by two steps.

In addition, if the data fluctuation rate is more than the set threshold (e.g. 20%), it is regarded as a situation requiring emergency inspection because the data fluctuation is too severe. It can also be set.

Meanwhile, since the data change rate section shown in FIG. 8 is only an example, a different range and method may be applied in actual application.

Also, depending on the importance of data, the transmission period can be adjusted differently even if the data change rate is the same.

For example, according to the type of data transmitted by the terminal 100, the importance (eg, high, medium, low) may be set and stored, and the transmission period adjustment details may be set differently according to the importance.

In this case, even when the data change rate is the same, it is desirable to reduce the transmission period to a greater extent as the importance of the data increases. In this way, it is possible to improve safety and efficiency of the system as a whole by regards data of high importance as having a critical situation even if the change rate is small, and by changing the transmission period to be quickly transmitted to the monitoring server 400. (ST19, ST20)

Hereinafter, a method for adjusting a transmission period according to a second embodiment of the present invention will be described with reference to the flowchart of FIG. 9. The method according to the second embodiment is to change the transmission period of the corresponding terminal 100 by determining a new transmission period to be applied to the terminal 100 causing the collision when a data collision due to simultaneous reception is detected in the monitoring server 400. That's the way.

First, the plurality of terminals 100 constituting the LPWA network transmit predetermined data when the transmission period arrives, and the monitoring server 400 receives the data transmitted by each terminal 100 through the gateways 210 and 220. . (ST31)

Subsequently, the data collision determination unit 422 of the monitoring server 400 checks whether there is data that has only received a header among the received uplink data, and extracts information of the terminal 100 if there is data that has only received the header. It is determined that the corresponding terminal has caused a data collision.

FIG. 10A illustrates a case in which data transmission periods of two terminals 100c and 100d overlap each other among four terminals 100a, 100b, 100c, and 100d. (ST32)

When a data collision is confirmed by the data collision determination unit 422, the reception time pattern analysis unit 424 analyzes the reception time pattern using the data reception information for a set period (eg, 10 minutes immediately before).

When the reception time pattern is analyzed, as shown in (b) of FIG. 10, it is possible to check a reception section in which a signal from the terminal 100 is received and a non-reception section in which no signal is received at the gateways 210 and 220 during the set period. . (ST33)

The transmission period determining unit 426 extracts an unreceived section in which the signal from the terminal 100 is not received from the gateways 210 and 220 using the analysis result of the reception time pattern, and Determine a new transmission period.

If the data collision determination unit 422 confirms that the signal of the terminal 100c has collided, after checking the transmission period of the terminal 100c, as shown in (b) of FIG. Create a new transmission period.

Subsequently, the monitoring server 400 transmits a transmission period change command to the terminal 100 together with the determined transmission period. The terminal 100 changes the currently set transmission period to a new transmission period in response to the transmission period change command. FIG. 10C illustrates a state in which the transmission periods of the four terminals are widely distributed as the transmission period of the terminal 100c is changed. (ST34,35)

After changing the transmission period in response to the change command of the monitoring server 400, the terminal 100 applies the method according to the first embodiment of the present invention to automatically adjust the transmission period determined by the monitoring server 400 according to the data change rate. You can also increase or shorten it with.

Meanwhile, the transmission period adjustment method according to an embodiment of the present invention may be implemented in the form of a program command that can be executed through various computer means and recorded in a computer-readable recording medium.

In this case, the computer-readable recording medium may include a program command, a data file, a data structure, or the like alone or in combination. The program instructions recorded on the recording medium may be specially designed and configured for the present invention, or may be known to and usable by a person skilled in the art of computer software.

Computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs and DVDs, and magnetic media such as floptical disks. It may include at least one of an optical medium (Magneto-Optical Media), a ROM, a RAM, a flash memory, and the like.

In addition, the program instruction may include a high-level language code that can be executed by a computer using an interpreter or the like as well as a machine language code generated by a compiler.

In the above, a preferred embodiment of the present invention has been described, but the present invention is not limited to the above-described embodiment, and may be variously modified or modified in a specific application process.

As an example, it has been described above that the terminal 100 and the gateways 210 and 220 perform long-distance low-power (LPWA) communication, but the communication method is not necessarily limited to this, so the implementation of the present invention even when other communication standards are used. According to an example, the transmission period of the terminal 100 may be adaptively adjusted.

As another example, it was previously described that the monitoring server 400 is connected to the gateways 210 and 220 through the Internet 300, but the gateways 210 and 220 and the monitoring server 400 may directly communicate by wire or wirelessly.

Alternatively, the gateways 210 and 220 and the monitoring server 400 may be integrated into one device.

As described above, the present invention may be modified or modified in various forms in a specific application process, and modified or modified embodiments are included in the scope of the present invention if the technical idea of the present invention disclosed in the claims to be described later is included. I will say of course.

100: terminal 110: processor 120: memory
122: transmission data analysis unit 124: transmission period determination unit
130: data acquisition unit 140: wireless communication unit 190: bus
210, 220: gateway 300: internet 400: monitoring server
410: processor 420: memory 422: data conflict determination unit
424: reception time pattern analysis unit 426: transmission period determination unit 430: communication unit
490: bus

Claims (14)

In a method for adjusting a transmission period of a wireless terminal transmitting and receiving data with a monitoring server,
Generating, by the wireless terminal, data to be transmitted;
Calculating, by the wireless terminal, a data change rate by comparing the data to be transmitted and the immediately preceding data transmitted in the immediately preceding period;
Step of the wireless terminal adjusting the transmission period according to the data change rate
Transmission period adjustment method of a wireless terminal comprising a The method of claim 1,
In the step of adjusting the transmission period, the transmission period adjustment method of a wireless terminal, characterized in that the increase or decrease of the transmission period is differentiated according to the size of the data change rate. The method of claim 1,
In the step of adjusting the transmission period, the transmission period adjustment method of a wireless terminal, characterized in that the larger the importance of the data, the greater the reduction in the transmission period according to the data change rate. The method of claim 1,
In the step of adjusting the transmission period, if the data fluctuation rate falls within the set range, the previous period is applied as it is. Transmission period adjustment method of a wireless terminal, characterized in that the period is changed to be shorter than the previous period The method of claim 4,
Transmission period adjustment method of a wireless terminal, characterized in that when the data change rate exceeds a threshold value, the transmission period is changed to the shortest transmission period The method of claim 1,
In the step of calculating the data change rate, the rate of change of the value classified by the classification code (Od) is individually calculated by comparing the data packet of the data to be transmitted and the data packet of the immediately preceding data, and then the rate of change of each value is added Method of adjusting transmission period of wireless terminal The method of claim 1,
When a transmission period change command is received from the monitoring server after the step of adjusting the transmission period, the transmission period is adjusted again in response to the transmission period change command. In the method of adjusting the transmission period of the wireless terminal transmitting and receiving data with the monitoring server in the monitoring server,
Receiving, by the monitoring server, data from a plurality of wireless terminals;
Determining whether a data collision has occurred and a wireless terminal causing a data collision;
If data collision is confirmed, analyzing a data reception time pattern for a set period to confirm a non-reception section;
Determining a new transmission period of the wireless terminal causing the collision, and determining that the new transmission period falls within the non-reception period;
Transmitting a transmission period change command together with the newly determined transmission period to the wireless terminal that caused the collision
Transmission period adjustment method of a wireless terminal comprising a The method of claim 8,
The data transmitted from multiple wireless terminals is received by the gateway and transmitted to the monitoring server,
The monitoring server analyzes the data received from the gateway to check whether there is a data collision and the wireless terminal causing the collision. The method of claim 8,
After the step of transmitting the transmission period change command together with the newly determined transmission period to the wireless terminal that caused the collision,
Changing the transmission period in response to the wireless terminal receiving the transmission period change command;
Generating, by the wireless terminal, data to be transmitted;
Calculating, by the wireless terminal, a data change rate by comparing the data to be transmitted and the immediately preceding data transmitted in the immediately preceding period;
Adjusting the transmission period according to the data change rate
A method of adjusting a transmission period of a wireless terminal, comprising: A computer-readable recording medium on which a program implementing the transmission period adjustment method of any one of claims 1 to 10 is recorded. In a wireless terminal transmitting and receiving data with a monitoring server,
A data acquisition unit that collects data to be transmitted to the monitoring server and generates data to be transmitted;
A transmission data analysis unit for calculating a data change rate by comparing the data to be transmitted and the immediately preceding data transmitted in the immediately preceding period;
Transmission period determination unit that determines whether or not the transmission period is increased or decreased using the calculated data change rate
Wireless terminal comprising a In the monitoring server for transmitting and receiving data with a plurality of wireless terminals,
A data collision determination unit for checking whether a data collision due to simultaneous reception has occurred and a wireless terminal causing a data collision;
When a data collision is confirmed, a reception data analysis unit that analyzes a data reception time pattern for a set period to check a non-reception section;
A transmission period determining unit that determines a new transmission period of the wireless terminal that caused the collision, but determines that the new transmission period falls within the non-reception period.
Monitoring server including In a wireless network system comprising a plurality of wireless terminals, a monitoring server for transmitting and receiving data with the plurality of wireless terminals,
The wireless terminal,
A data acquisition unit that collects data to be transmitted to the monitoring server and generates data to be transmitted;
A transmission data analysis unit for calculating a data change rate by comparing the data to be transmitted and the immediately preceding data transmitted in the immediately preceding period;
Transmission period determination unit that determines whether or not the transmission period is increased or decreased using the calculated data change rate
Including,
The monitoring server,
A data collision determination unit for checking whether a data collision due to simultaneous reception has occurred and a wireless terminal causing a data collision;
When a data collision is confirmed, a reception data analysis unit that analyzes a data reception time pattern for a set period to check a non-reception section;
A transmission period determining unit that determines a new transmission period of the wireless terminal that caused the collision, but determines that the new transmission period falls within the non-reception period.
Wireless network system including

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