KR102284043B1 - Method, apparatus and computer readable recording medium for time synchronization between devices and simultaneous execution of multiple devices using thereof - Google Patents

Abstract

Provided is a technology which quickly and accurately synchronizes time between terminals in a client-server environment and simultaneously executes a process in a plurality of terminals on the basis of time synchronization to build a multi-terminal process execution environment. According to one embodiment of the present invention, a method for synchronizing time between terminals including a computing device, which includes one or more processors and one or more memories storing instructions executable by the processors, and simultaneously executing a plurality of terminals by using time synchronization comprises: a delay time calculation step of transmitting, by a client terminal, a first signal to a server terminal and using a transmission time of the first signal and a reception time of a second signal to calculate a delay time between the client terminal and the server terminal when receiving the second signal, which is a response signal to the first signal, transmitted from the server terminal; a server timestamp receiving step of receiving, by the client terminal, a timestamp of the server terminal which is a signal for absolute time transmitted from the server terminal; and a timestamp setting step of setting, by the client terminal, the absolute time of the client terminal to a value obtained by adding the time delay time calculated by the delay time calculation step to the timestamp of the server terminal received by the server timestamp receiving step.

Description

Time synchronization between terminals and simultaneous execution method of multiple terminals using the same, system and computer-readable recording medium

The present invention relates to time synchronization between terminals to eliminate a difference in process execution time between a plurality of terminals under a process progress environment through a plurality of terminals and to concurrent process execution using the same, specifically, a configuration for separate time synchronization such as GPS technology for enabling the construction of a multi-terminal process execution environment by synchronizing time between terminals very quickly and accurately in a client-server environment and multiple client environments, and simultaneously executing processes in multiple terminals based on this will be.

According to the development of processing technology of computing devices and the diversification of the multimedia environment, as a plurality of terminals execute one process at the same time to output, for example, a part of the entire image from a plurality of output devices, one content is transmitted to a plurality of output devices. A content reproduction technology such as output from a single monitor using the

This is a series of client-server environments or It is possible depending on the implementation and control of the terminal structure of the multiple client environment.

In such an environment, especially in multimedia playback, in an environment in which a specific image is divided and output in each terminal to reproduce one content, when each process is executed in each terminal, the execution time must be completely synchronized. That is, if there is even a slight difference in the multimedia playback timing between terminals, it is impossible to reproduce one content.

That is, in the above-described environment, synchronizing the time between terminals, that is, the timestamp is an essential condition when executing a process. Recently, various technologies for implementing time synchronization between terminals have been developed.

For example, Korean Patent Registration No. 10-1613594, etc. includes a configuration having an absolute timestamp such as GPS in the environment of multiple terminals or terminals, and synchronizes the time between terminals according to the timestamp of the GPS.

In these prior technologies, accuracy can be guaranteed in terms of synchronizing time through a reference having an accurate absolute timestamp such as GPS, but when GPS reception is not possible, it is virtually impossible to implement the technology, and a separate GPS reception module There is a problem in that the process of time synchronization is complicated and a separate construction cost is required because it needs to be installed.

Accordingly, an object of the present invention is to provide a technique for error-free execution of a process between terminals in a multi-terminal environment by enabling very fast and accurate time synchronization between terminals without requiring any configuration for separate time synchronization. there is.

In addition, in the process execution control, the present invention provides a control technology that allows the process to be executed accurately in multiple terminals in consideration of the synchronized time and data transmission delay between terminals, thereby achieving synchronization of time between terminals and synchronization of process execution in the environment. Another purpose is to make the implementation very fast and accurate.

In order to achieve the above objects, time synchronization between terminals and the simultaneous execution method of multiple terminals using the same according to an embodiment of the present invention includes one or more processors and one or more memories for storing instructions executable in the processor To a method for synchronizing time between terminals including a computing device and a method for simultaneously executing multiple terminals using the same, wherein a client terminal transmits a first signal to a server terminal, and a first signal transmitted from a server terminal that has transmitted the first signal a delay time calculation step of calculating a time delay time between the client terminal and the server terminal by using the transmission time of the first signal and the reception time of the second signal when receiving the second signal as a response signal; a server timestamp receiving step of receiving, by the client terminal, a timestamp of the server terminal, which is a signal for absolute time transmitted from the server terminal; and a timestamp setting step in which the client terminal sets the absolute time of the client terminal to a value obtained by adding the time delay time calculated by the delay time calculation step to the timestamp of the server terminal received by the server timestamp receiving step. ; It is characterized in that it includes.

The delay time calculation step may include: a transmission time detection step of detecting a transmission time point at which the first signal is transmitted as a transmission time point when the first signal is transmitted; a reception time detection step of detecting the reception time of the second signal as a reception time when the second signal is received; a sample delay calculation step of calculating a value obtained by dividing an error time between the transmission time and the reception time by 2 as a sample delay time; and a delay time calculation step of calculating an average value of the sample delay times calculated as a result of performing the transmission timing detection step, the reception timing detection step, and the sample delay calculation step a predetermined number of times as the time delay time; It is preferable to include

In the step of calculating the delay time, a maximum value, a minimum value, and an error value that is a signal value in which transmission of the first signal and reception of the second signal are not normally performed among the sample delay times for which the average value is derived. It is preferable to calculate the time delay time excluding the delay time.

When the target terminal for time synchronization is a terminal in a multiple client terminal environment rather than a server-client environment, a time sync server, which is a separate server for time synchronization, functions as the server terminal, and is assigned to the time sync server to determine the delay time When the maximum number of client terminals for which the calculation step, the server timestamp receiving step, and the timestamp setting step are performed is a preset first number, and the number of the client terminals is a second number exceeding the first number, After execution of the timestamp setting step, the time sync server releases the assignment to the time sync server of the client terminal on which the timestamp setting step is completed, and assigns a new client terminal unassigned to the time sync server to the time sync server It is preferable to further include a; terminal update step of allocating to the time synchronization target.

After the terminal update step is performed, the time sync server determines whether it is possible to allocate a new client terminal that is not allocated to the time sync server, and the timestamp setting step is completed to allocate a new client terminal to all client terminals If it is not possible, it is preferable to further include a setting completion step of completing the timestamp setting.

After the timestamp setting step for all client terminals is performed according to the repeated execution of the timestamp setting step, the server terminal is executed simultaneously between at least two client terminals among the client terminals on which the timestamp setting step is performed. It is preferable to further include a process execution control step of controlling the client terminal to execute the process at a preset execution time based on a synchronized time when a process exists.

In the process execution control step, the server terminal selects a maximum delay time that is the largest value among the time delay times calculated for a plurality of client terminals that are the execution targets of the process to be simultaneously executed, and the process execution time is at least a preset process. the execution time setting step of setting the process execution time to be a later time than the sum of the maximum delay time from the execution command transmission time; and transmitting, by the server terminal, a control command for executing a process at the process execution time point at the process execution command transmission time point to a plurality of client terminals to be executed of the process. It is preferable to include

Meanwhile, in accordance with an embodiment of the present invention, there is provided a system for synchronizing time between terminals and simultaneously executing multiple terminals using the same, comprising: a client terminal that transmits a first signal and executes a preset process; and a server terminal that receives the first signal, transmits a second signal that is a response signal when the first signal is received, to the client terminal, and transmits a control command related to execution of the process; Including, wherein, when receiving the second signal, the client terminal calculates a time delay time between the client terminal and the server terminal using the transmission time of the first signal and the reception time of the second signal, and After receiving the timestamp of the server terminal, which is a signal for the transmitted absolute time, the absolute time of the client terminal is set to a value obtained by adding the time delay time to the timestamp of the server terminal.

When the target terminal for time synchronization is a terminal in a multi-client terminal environment rather than a server-client environment, a time sync server, which is a separate server for time synchronization, functions as the server terminal, and is assigned to the time sync server and the client terminal When the maximum number of client terminals capable of setting the absolute time of is a preset first number and the number of client terminals is a second number exceeding the first number, the time sync server may It is preferable to release the assignment to the time sync server of the client terminal for which the time setting has been completed, and to allocate a new client terminal that is not allocated to the time sync server as a time synchronization target to the time sync server.

The server terminal executes the process at a preset execution time based on the synchronized time when there is a process to be simultaneously executed between at least two or more client terminals among the client terminals after the absolute time setting for all client terminals is completed control the client terminal to do so, but select a maximum delay time that is the largest value among the time delay times calculated for a plurality of client terminals that are targets of a process to be executed simultaneously, and a process execution command with at least a preset execution time After setting the process execution time to be a later time than the value obtained by adding the maximum delay time from the transmission time, the execution target of the process sends a control command to execute the process at the process execution time at the process execution command transmission time It is preferable to transmit to a plurality of client terminals.

According to the present invention, in a client-server environment or a multi-client environment, a delay time is calculated using an error between data transmission/reception and response signals between a simple computing device such as a server or a time sync server and a client terminal, and this is used as a reference timestamp. Through a very simple and intuitive process of adding to a server or time sync server with

In addition, by using the delay time to determine the execution time of the process, when the control command is transmitted from the server to the client, it completely blocks the occurrence of errors in receiving the control command according to the delay time, and all terminals simultaneously execute the process at a specific point in time. By making it possible to execute, there is an effect of enabling the simultaneous execution of processes of multiple terminals very simply and accurately.

1 to 5 are flowcharts of time synchronization between terminals and a method of simultaneously executing multiple terminals using the same according to an embodiment of the present invention.
6 is a diagram for explaining the structure of a system for simultaneous execution of multiple terminals using time synchronization between terminals according to an embodiment of the present invention;
7 is a view for explaining a method of synchronizing time between terminals using a time sync server in a multi-client environment;
8 is a diagram for explaining a flow in which terminal time is synchronized according to an implementation of an embodiment of the present invention;
9 is a diagram for explaining a flow in which process execution of multiple terminals is synchronized according to an implementation of an embodiment of the present invention;
10 is an example of an internal configuration of a computing device according to an embodiment of the present invention.

Hereinafter, various embodiments and/or aspects are disclosed with reference to the drawings. In the following description, for purposes of explanation, numerous specific details are set forth to provide a thorough understanding of one or more aspects. However, it will also be recognized by one of ordinary skill in the art that such aspect(s) may be practiced without these specific details. The following description and accompanying drawings set forth in detail certain illustrative aspects of one or more aspects. These aspects are illustrative, however, and some of various methods may be employed in the principles of various aspects, and the descriptions set forth are intended to include all such aspects and their equivalents.

As used herein, “embodiment”, “example”, “aspect”, “exemplary”, etc. may not be construed as an advantage or an advantage in any aspect or design described herein over other aspects or designs. .

Also, the terms "comprises" and/or "comprising" mean that the feature and/or element is present, but excludes the presence or addition of one or more other features, elements and/or groups thereof. should be understood as not

Also, terms including an ordinal number such as 1st, 2nd, etc. may be used to describe various components, but the components are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.

In addition, in the embodiments of the present invention, unless otherwise defined, all terms used herein, including technical or scientific terms, are those commonly understood by those of ordinary skill in the art to which the present invention belongs. have the same meaning. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in an embodiment of the present invention, an ideal or excessively formal meaning is not interpreted as

Meanwhile, in the present invention, a terminal including at least one of a client terminal and a server terminal is a device capable of performing the functions of the present invention, such as a wire/wireless telephone, a personal computer, and a tablet PC. (Tablet PC), laptop (Laptop), smart phone (Smartphone), personal digital assistant (Personal Digital Assistant), it can be understood that any one of a mobile communication terminal (Mobile Communication Terminal) is used.

In the present invention, the client terminal may be, for example, a terminal that plays multimedia content. In this case, the client terminals are arranged to be connected to each other, such as in a lattice form, indoors and outdoors, or are arranged independently, so that a plurality of client terminals are overlapped or connected to each other to form one content. For example, a plurality of terminals constituting a multi-vision or video wall may be included in the client terminal. However, it will be understood that, in addition to the above-described examples, the client terminal includes all terminals that execute a specific process simultaneously with each other under the control of the server terminal.

The server terminal means a terminal that simultaneously controls a plurality of client terminals in the execution of the above-described process. In this case, instead of in a client-server environment, a plurality of client terminals are configured in a peer-to-peer (P2P, Peer to Peer) format. In a multiple client environment, it will be understood to mean a specific client terminal performing a function of a server terminal, or a control environment itself between clients performing a function of a server terminal. In addition, a time sync server, which will be described later, should be understood as the same concept as the above-described server terminal, or to mean a specific client terminal or a separate terminal performing only a time synchronization function.

In the present invention, the process includes performing all functions connected to each other or independently executed in a plurality of terminals to perform one function. In the above example, the process refers to a playback process of multimedia content. In addition, all processes to which the functions of the present invention that must be performed in synchronization in a plurality of terminals, such as a physical event reproduction process, a payment process, and a sequential data processing process, can be applied will be understood as a concept included in the process described below.

Referring to FIG. 1 based on this background, in the present invention, the client terminal transmits a first signal to the server terminal, and the first signal is a response signal to the first signal transmitted from the server terminal that has transmitted the first signal. When the second signal is received, a delay time calculation step (S10) of calculating a time delay time between the client terminal and the server terminal is performed using the transmission time of the first signal and the reception time of the second signal.

The first signal is, for example, a basic signal of a simple 8 Byte size for timestamp measurement, or between the server terminal and the client terminal, such as environment setting in preparation for actual control command transmission/reception or process execution, from the client terminal to the server terminal Among a series of transmitted data signals, all signals corresponding to 8-byte sized signals may be included. That is, in the present invention, in order to separately generate and transmit the first signal for time synchronization, or to prevent such unnecessary data waste, the same specific size ( For example, it is assumed that all signals of 8 bytes) are transmitted as the first signal. In the case of the latter example, the identification value for the first signal may be stored in the client terminal to recognize that it functions as the first signal.

Meanwhile, the server terminal receiving the first signal may generate a response, that is, a kind of Ack signal, and transmit it to the client terminal. The corresponding signal is, for example, an Ack signal indicating that the first signal has been successfully received, and is a signal that is transmitted immediately upon reception of the first signal and transmitted to the client terminal.

In this case, the client terminal temporarily stores the transmission time of the first signal, and when receiving the second signal, temporarily stores the reception time of the second signal, and then calculates the time between the corresponding time points. At this time, each time point is calculated using the timestamp of the client terminal before synchronization and is calculated by calculating the time between the time points, or a timer that sets the time of transmission of the first signal to 0 is set from the time of transmission of the first signal. It operates and is calculated by checking the reception time of the second signal, so that the timer value may be derived as a time between the transmission time of the first signal and the reception time of the second signal.

The time between the transmission/reception time of the first signal and the second signal may be used as a delay time in synchronization for data transmission/reception, that is, a time delay time between the server and the client terminal. That is, the execution command of the process is transmitted from the server. Depending on the client terminal, each timestamp must reflect a delay as much as the signal transmission time for the transmission of the corresponding command so that the time of a plurality of client terminals can be completely synchronized.

Specifically, step S10, which is a process of calculating the time delay time, may be embodied and performed as in the example shown in FIG. 2 .

Referring to FIG. 2 , the client terminal first, as in the above-described example, when transmitting the first signal, performs a transmission timing detection step (S11) of detecting the transmission timing of the first signal as the transmission timing, and a second When the signal is received, the reception time detection step S12 of detecting the reception time of the second signal as the reception time is performed.

Since the time required to reflect the subsequent delay in the timestamp corresponds to the one-way signal transmission time during which the control command from the server terminal must be transmitted to the client terminal, the value obtained by dividing the error time between the transmission time and the reception time by 2 is used as the sample delay time. A sample delay calculation step S13 is performed.

Steps S11 to S13 will be more accurate when performed multiple times than when performed once. Accordingly, the client terminal, for example, calculates the average value of the sample delay times calculated as a result of performing steps S11 to S13 sequentially a predetermined number of times (for example, 50 times) as the time delay time between the client terminal and the server terminal. A delay time calculation step (S14) calculated as .

At this time, it is understood that the predetermined number of times is not set, or steps S11 to S13 are repeatedly performed without being determined until the time when the process execution time and the time when the process execution command is expected to be transmitted to all client terminals from the server terminal according to the execution time of the process can be That is, when the execution schedule of the process is set and stored in advance, the execution command of the process will be transmitted from the server terminal to each client terminal from the server terminal a predetermined time in consideration of the delay. The accuracy is further improved by repeating steps S11 to S13 without determining the number of times.

In order to increase the calculation accuracy of the time delay time in performing step S14, for example, the client terminal transmits the maximum value, the minimum value, and the first signal and the second signal among the sample delay times for which the average value is derived. It may be desirable to calculate the time delay time excluding the sample delay time corresponding to an error value, which is a signal value that is not normally received.

At this time, it is determined that the error value cannot be used as the sample delay time, such as the second signal is not received because the response signal to the first signal is not transmitted, or the first signal does not exist but the second signal is received. It should be understood to mean all cases.

When the execution of step S10 that is specifically performed as described above is completed, the client terminal receives a timestamp of the server terminal, which is a signal for absolute time transmitted from the server terminal, for time synchronization ( S20) is performed.

The timestamp of the server terminal is information about a time that is a reference as an absolute time, and may be understood as a concept including information on the origin date, hour, minute, and second. That is, as a kind of clock signal, the corresponding signals may be used as a signal for determining the timing of performing various functions of the present invention, such as a process execution time.

When step S20 is performed, the client terminal sets the absolute time of the client terminal, that is, the timestamp to the timestamp of the server terminal received by performing step S20 plus the time delay time calculated by performing step S10. A timestamp setting step (S30) is performed.

That is, the timestamp of the client terminal may also be used as a criterion for determining the execution time of the process in the client terminal, and in this case, the time delay time described above must be reflected, because the execution time of the process of all clients will be completely identical. That is, the above-described steps S10 to S30 may be repeated to be performed among all client terminals to be controlled in the server-client environment. That is, when the execution of step S30 is completed in all the client terminals, the server terminal may treat the time synchronization for all terminals as completed, and proceed with the subsequent process.

Referring to FIG. 8 , the first signal S1 is transmitted from the client terminal to the server terminal, and as an Ack signal for this, the second signal S2 is transmitted from the server terminal to the client terminal. In this case, the sample delay time SD may be calculated as (S2-S1)/2 as described above. After this process is repeated n times, the average value will be calculated as the time delay time DT, excluding the maximum value, the minimum value, and the error value. Thereafter, after receiving the timestamp of the server terminal, the client terminal uses a value obtained by adding DT to the timestamp of the server terminal as its timestamp.

Such a server-client environment may be implemented, for example, as a system as shown in FIG. 6 . That is, the above-described steps S10 to S30 are performed between the server terminal 20 and all client terminals 10 belonging to the terminal group 1 to be controlled. However, among the environments of multiple terminals, there may be multiple terminal environments in which no server terminals exist, and even in a server-client environment, in an environment in which the number of client terminals 10 that can be synchronized with the server terminal 20 is determined. , since the number of client terminals 10 is large, time synchronization of all the client terminals 10 at once may not be possible.

In this multi-client environment, when performing all the above-described functions, a time sync server, which is a separate server or terminal for time synchronization, may function as the above-described server terminal. The number of performing client terminals may be determined as the first number.

At this time, as described above, if the number of client terminals to be time synchronization is a second number exceeding the first number, after the execution of step S30, as shown in FIG. 3 , the time sync server is currently performing step S30 Release the assignment of the completed client terminal to the time sync server, and update the terminal to allocate a new client terminal that is not assigned to the time sync server and is determined to be in a state in which the execution of step S30 is incomplete to the time sync server as a time synchronization target Step S40 is performed.

In this case, the time sync server means any one of the client terminals or a terminal that exists separately for time synchronization in a multiple client terminal environment in which the server terminal does not exist, and the number of client terminals that the server terminal can process time synchronization is determined. When the number of client terminals is the second number exceeding the predetermined first number, it will be understood that the server terminal itself is a time sync server.

Based on this, referring to FIG. 7 , the time sync server 21 may be described as having an allocated space 200 in which the number of client terminals 11 capable of time synchronization is determined. In this case, client terminals C1 to C5 are allocated to the allocation space 200 in the first step, and terminals C6 to C9 are maintained as unallocated client terminals 12 in the allocation space 200 .

At this time, if it is determined that step S30 has been completed in the terminal S1, through the execution of step S40, the time sync server releases the assignment to the terminal C1, that is, the terminal 13 on which the step S30 has been completed, and the unassigned client terminal 21 ), any one of the terminals C6 and 14 is newly allocated to the allocation space 200 . After that, when the execution of step S30 for C3 is completed, the allocation of C3 is released, and a new assignment of any one terminal (C7) of the terminals 12 other than the terminal 13 for which the execution of step S30 is completed is repeated. do.

After performing the terminal update step (S40), the time sync server determines whether it is possible to allocate a new client terminal unassigned to the time sync server, and the time stamp setting step (S30) is completed for all client terminals to complete the new client If the terminal cannot be assigned, a setting completion step (S50) of completing the timestamp setting is performed.

That is, if step S30 for all client terminals corresponding to the second number is completed, for example, all release of the allocation space 200 is completed, or identification information of the client terminal on which step S30 is completed without this process is displayed. When the server terminal or the time sync server detects that time synchronization for all client terminals is completed by storing, step S50 is completed. That is, step S50 is not only performed after step S40 is performed, but it will be understood that the above-described server-client environment may be performed even when the repeated execution of step S30 is completed for all client terminals.

Meanwhile, after the time synchronization is completed, that is, when it is determined that the execution of step S30 is completed for all client terminals according to the repeated execution of step S30, or when the above-described step S50 is completed, the server for simultaneous execution of the actual process The terminal may perform a function. That is, as shown in FIG. 4 , when a process to be simultaneously executed between at least two or more client terminals among the client terminals on which the timestamp setting step S30 is performed exists, the server terminal executes a preset execution time based on the synchronized time A process execution control step (S60) of controlling the client terminal to execute the process is performed.

A process to be executed simultaneously between at least two or more client terminals will be understood to mean a process mentioned in the above description of the present invention. At this time, the process is not abruptly executed, but as a signal transmitted from the server terminal to the client terminal, including the execution time and execution command for the processes that each client terminal must execute for the simultaneous execution (group execution) of the process. It would be natural to be executed by a control signal.

At this time, after the time of all client terminals is synchronized by the above-described process, the processes of each client terminal are executed precisely at the corresponding time point, so that all processes are executed without error.

A specific example of the step S60 is shown in FIGS. 5 and 9 . Referring to FIGS. 5 and 9 , first, each of the client terminals C1 , C2 , and C3 may have different timestamps CT1 , CT2 , and CT3 before time synchronization. At this time, when steps S10 to S30 described above are performed for all clients C1, C2, and C3, all times are synchronized equally with the CTS.

At this time, the server terminal, in performing step S60. The server terminal selects the maximum delay time (MAX(DT)), which is the largest value among the time delay times calculated for a plurality of client terminals that are the execution targets of the process to be simultaneously executed, and executes the process with at least a preset execution time point The execution time setting step ( S61 ) of setting the process execution time to a point later than the value obtained by adding the maximum delay time from the command transmission time is performed. In this case, the timing of transmitting the processor execution command means a random or predetermined time point after the time synchronization is completed as shown in FIG. 9 .

This is, for example, when the process execution time, that is, multimedia content playback, when comparing the content start time and the control command transmission time, the value obtained by adding MAX(DT) from the control command transmission time becomes after the process execution time. , a specific client terminal, that is, terminal C2 in the example of FIG. 9 , receives a control command after the process execution time, so that the process is not simultaneously executed in all client terminals at the same time, or the process is not executed in terminal C2 at all. can occur In order to prevent such an error from occurring, step S61 is performed.

Thereafter, the server terminal performs a command transmission step (S62) of transmitting a control command to execute the process at the time of the process execution command to a plurality of client terminals that are the execution targets of the process, at the time of transmitting the process execution command, Enables accurate batch execution on the client.

Meanwhile, the time synchronization between terminals and the simultaneous execution system of multiple terminals using the same according to an embodiment of the present invention can be understood as a structure including a server terminal 20 and a client terminal 10 as shown in FIG. 6 . there is. In this case, each function of the server terminal 20 and the client terminal 10 is as described above.

That is, the client terminal 10 transmits a first signal, executes a preset process, the server terminal 20 receives the first signal, and when receiving the first signal, sends a second signal that is a response signal to the client. It transmits to the terminal, and performs a function of transmitting the above-described control command related to the execution of the process.

At this time, when the client terminal 10 receives the second signal as described above, the time between the client terminal 10 and the server terminal 20 using the transmission time of the first signal and the reception time of the second signal After calculating the delay time and receiving the timestamp of the server terminal 20, which is a signal for the absolute time transmitted from the server terminal 20, the absolute time of the client terminal 10, that is, the timestamp is transferred to the server terminal 20 ) timestamp plus the time delay time.

At this time, as mentioned in the description of FIG. 7 , a terminal to be time synchronization is a terminal in a multiple client terminal environment rather than a server-client environment, or the number of client terminals capable of performing time synchronization by the server terminal is determined. When the number of client terminals exceeds this, a time sync server, which is a separate server for time synchronization, functions as a server terminal, or the server terminal itself is understood as a time sync server.

In this case, when the maximum number of client terminals allocated to the time sync server and capable of setting the absolute time of the client terminals is a preset first number, and the number of client terminals is a second number exceeding the first number, time sync The server releases the assignment to the time sync server of the client device for which the absolute time setting of the client device is completed, and assigns a new client device that is not assigned to the time sync server to the time sync server as a time synchronization target. can do.

In addition, as mentioned in the description of steps S60, S61, and S62, when time synchronization for all client terminals is completed, the server terminal determines the synchronized time when there is a process to be executed simultaneously between at least two or more client terminals among the client terminals. The client terminal is controlled to execute the process at a preset execution time as a reference.

At this time, a maximum delay time, which is the largest value among the time delay times calculated for a plurality of client terminals to be executed at the same time, is selected, and the maximum delay time from the time when the process execution command is transmitted is at least a preset time for executing the process. A function of setting the process execution time to be a later time than the sum of , and then transmitting a control command to execute the process at the upper process execution time at the process execution command transmission time to a plurality of client terminals that are the execution targets of the process carry out

As described above, although the embodiments have been described with reference to the limited embodiments and drawings, various modifications and variations are possible by those skilled in the art from the above description.

On the other hand, FIG. 10 shows an example of an internal configuration of a computing device according to an embodiment of the present invention, and in the following description, descriptions of unnecessary embodiments overlapping with those of FIGS. is to be omitted.

10, the computing device 10000 includes at least one processor 11100, a memory 11200, a peripheral interface 11300, an input/output subsystem ( It may include at least an I/O subsystem) 11400 , a power circuit 11500 , and a communication circuit 11600 . In this case, the computing device 10000 may correspond to a user terminal connected to the tactile interface device (A) or the aforementioned computing device (B).

The memory 11200 may include, for example, a high-speed random access memory, a magnetic disk, an SRAM, a DRAM, a ROM, a flash memory, or a non-volatile memory. there is. The memory 11200 may include a software module, an instruction set, or other various data required for the operation of the computing device 10000 .

In this case, access to the memory 11200 from other components such as the processor 11100 or the peripheral interface 11300 may be controlled by the processor 11100 .

Peripheral interface 11300 may couple input and/or output peripherals of computing device 10000 to processor 11100 and memory 11200 . The processor 11100 may execute a software module or an instruction set stored in the memory 11200 to perform various functions for the computing device 10000 and process data.

The input/output subsystem 11400 may couple various input/output peripherals to the peripheral interface 11300 . For example, the input/output subsystem 11400 may include a controller for coupling a peripheral device such as a monitor, keyboard, mouse, printer, or a touch screen or sensor as needed to the peripheral interface 11300 . According to another aspect, input/output peripherals may be coupled to peripheral interface 11300 without going through input/output subsystem 11400 .

The power circuit 11500 may supply power to all or some of the components of the terminal. For example, the power circuit 11500 may include a power management system, one or more power sources such as batteries or alternating current (AC), a charging system, a power failure detection circuit, a power converter or inverter, a power status indicator, or a power source. It may include any other components for creation, management, and distribution.

The communication circuit 11600 may enable communication with another computing device using at least one external port.

Alternatively, as described above, if necessary, the communication circuit 11600 may include an RF circuit to transmit and receive an RF signal, also known as an electromagnetic signal, to enable communication with other computing devices.

This embodiment of FIG. 10 is only an example of the computing device 10000, and the computing device 11000 may omit some components shown in FIG. 10, or further include additional components not shown in FIG. 10, or 2 It may have a configuration or arrangement that combines two or more components. For example, the computing device for a communication terminal in a mobile environment may further include a touch screen or a sensor in addition to the components shown in FIG. 10 , and various communication methods (WiFi, 3G, LTE) are provided in the communication circuit 1160 , Bluetooth, NFC, Zigbee, etc.) may include a circuit for RF communication. Components that may be included in the computing device 10000 may be implemented in hardware, software, or a combination of both hardware and software including an integrated circuit specialized for one or more signal processing or applications.

Methods according to an embodiment of the present invention may be implemented in the form of program instructions that can be executed through various computing devices and recorded in a computer-readable recording medium. In particular, the program according to the present embodiment may be configured as a PC-based program or an application dedicated to a mobile terminal. The application to which the present invention is applied may be installed in the user terminal through a file provided by the file distribution system. As an example, the file distribution system may include a file transmission unit (not shown) that transmits the file according to a request of the user terminal.

The device described above may be implemented as a hardware component, a software component, and/or a combination of the hardware component and the software component. For example, the devices and components described in the embodiments may include, for example, a processor, a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable gate array (FPGA), It may be implemented using one or more general purpose or special purpose computers, such as a programmable logic unit (PLU), microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to execution of the software. For convenience of understanding, although one processing device is sometimes described as being used, one of ordinary skill in the art will recognize that the processing device includes a plurality of processing elements and/or a plurality of types of processing elements. It can be seen that can include For example, the processing device may include a plurality of processors or one processor and one controller. Other processing configurations are also possible, such as parallel processors.

Software may comprise a computer program, code, instructions, or a combination of one or more thereof, which configures a processing device to operate as desired or is independently or collectively processed You can command the device. The software and/or data may be any kind of machine, component, physical device, virtual equipment, computer storage medium or device, to be interpreted by or to provide instructions or data to the processing device. may be permanently or temporarily embody in The software may be distributed over networked computing devices and stored or executed in a distributed manner. Software and data may be stored in one or more computer-readable recording media.

The method according to the embodiment may be implemented in the form of program instructions that can be executed through various computer means and recorded in a computer-readable recording medium. The computer-readable recording medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the medium may be specially designed and configured for the embodiment, or may be known and used by those skilled in the art of computer software. Examples of the computer-readable recording medium 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 floppy disks. - includes magneto-optical media, and hardware devices specially configured to store and carry out program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine language codes such as those generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

As described above, although the embodiments have been described with reference to the limited embodiments and drawings, various modifications and variations are possible by those skilled in the art from the above description. For example, the described techniques are performed in a different order than the described method, and/or the described components of the system, structure, apparatus, circuit, etc. are combined or combined in a different form than the described method, or other components Or substituted or substituted by equivalents may achieve an appropriate result. Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

Claims (11)

It relates to a time synchronization between terminals including one or more processors and a computing device including one or more memories for storing instructions executable by the processor, and a method for simultaneous execution of multiple terminals using the same,
When the client terminal transmits the first signal to the server terminal and receives the second signal that is a response signal to the first signal transmitted from the server terminal that has transmitted the first signal, the transmission time of the first signal and the second signal a delay time calculation step of calculating a time delay time between the client terminal and the server terminal using the reception time;
a server timestamp receiving step of receiving, by the client terminal, a timestamp of the server terminal, which is a signal for absolute time transmitted from the server terminal; and
a timestamp setting step of the client terminal setting the absolute time of the client terminal to a value obtained by adding the time delay time calculated by the delay time calculation step to the timestamp of the server terminal received by the server timestamp receiving step; including,
The first signal corresponds to an 8-byte signal among data signals transmitted between the server terminal and the client terminal for transmission/reception of a control command from the client terminal to the server terminal or for environment setting in preparation for process execution, etc. It is one signal selected among all the signals,
After the timestamp setting step for all client terminals is performed according to the repetition of the timestamp setting step,
The server terminal controls the client terminal to execute the process at a preset execution time based on the synchronized time when there is a process to be simultaneously executed between at least two client terminals among the client terminals on which the timestamp setting step is performed. Further comprising; a process execution control step to
The process execution control step is
The server terminal selects the maximum delay time that is the largest value among the time delay times calculated for a plurality of client terminals that are the execution targets of the process to be executed simultaneously, and the process execution time is at least the maximum from the preset process execution command transmission time. the execution time setting step of setting the process execution time to be a later time than a value obtained by adding a delay time; and
a command transmission step of transmitting, by the server terminal, a control command for executing a process at the process execution time point at the time of the process execution command transmission time point, to a plurality of client terminals to be executed of the process; including,
When the target terminal for time synchronization is a terminal in a multiple client terminal environment rather than a server-client environment, a time synchronization server, which is a separate server for time synchronization, functions as the server terminal, but the time synchronization server is selected from any of the client terminals. one, and the maximum number of client terminals allocated to the time sync server and performing the delay time calculation step, the server timestamp receiving step and the timestamp setting step is a preset first number, and the number of the client terminals is When the second number exceeds the first number,
After execution of the timestamp setting step,
Terminal update in which the time sync server releases the assignment to the time sync server of the client terminal for which the timestamp setting step is completed, and allocates a new client terminal that is not allocated to the time sync server to the time sync server as a time synchronization target Step; time synchronization between terminals, characterized in that it further comprises a method of simultaneous execution of multiple terminals using the same.
According to claim 1,
The delay time calculation step is,
a transmission time detection step of detecting a transmission time point when the first signal is transmitted as a transmission time point when the first signal is transmitted;
a reception time detection step of detecting the reception time of the second signal as a reception time when the second signal is received;
a sample delay calculation step of calculating a value obtained by dividing an error time between the transmission time and the reception time by 2 as a sample delay time; and
a delay time calculation step of calculating an average value of the sample delay times calculated as a result of performing the transmission timing detection step, the reception timing detection step, and the sample delay calculation step a predetermined number of times as the time delay time; Time synchronization between terminals, characterized in that it comprises a, and the simultaneous execution method of multiple terminals using the same.
3. The method of claim 2,
The delay time calculation step is,
Among the sample delay times for which the average value is derived, the maximum value, the minimum value, and the sample delay time corresponding to the error value, which is a signal value in which the transmission of the first signal and the reception of the second signal are not normally performed, are excluded. Time synchronization between terminals, characterized in that calculating the delay time, and a method for simultaneous execution of multiple terminals using the same.
delete According to claim 1,
After performing the terminal update step,
The time sync server determines whether it is possible to allocate new client terminals unassigned to the time sync server, and when the timestamp setting step is completed to all client terminals and cannot allocate new client terminals, time stamp setting Setting completion step of completing the; time synchronization between terminals and the simultaneous execution method of multiple terminals using the same, characterized in that it further comprises.
delete delete a client terminal that transmits a first signal and executes a preset process; and
a server terminal that receives the first signal, transmits a second signal that is a response signal when the first signal is received, to the client terminal, and transmits a control command related to execution of the process; including,
The client terminal is
When the second signal is received, the time delay time between the client terminal and the server terminal is calculated using the transmission time of the first signal and the reception time of the second signal, and the server which is a signal for the absolute time transmitted from the server terminal After receiving the timestamp of the terminal, the absolute time of the client terminal is set to a value obtained by adding the time delay time to the timestamp of the server terminal,
The first signal corresponds to an 8-byte signal among data signals transmitted between the server terminal and the client terminal for transmission/reception of a control command from the client terminal to the server terminal or for environment setting in preparation for process execution, etc. It is one signal selected among all the signals,
The server terminal,
After the absolute time setting for all client terminals is completed, when there is a process to be executed simultaneously between at least two client terminals among the client terminals, the client terminal is configured to execute the process at a preset execution time based on the synchronized time. control, but
The maximum delay time, which is the largest value among the time delay times calculated for a plurality of client terminals that are the execution targets of the process to be executed simultaneously, is selected, and the maximum delay time is determined from the time when the process execution command is transmitted in which the process execution time is set at least. After setting the process execution time to be later than the added value, a control command for executing the process at the process execution time at the process execution command transmission time is transmitted to a plurality of client terminals that are the execution targets of the process, ,
When the target terminal for time synchronization is a terminal in a multiple client terminal environment rather than a server-client environment, a time synchronization server, which is a separate server for time synchronization, functions as the server terminal, but the time synchronization server is selected from any of the client terminals. one, the maximum number of client terminals allocated to the time sync server and capable of setting the absolute time of the client terminal is a preset first number, and the number of the client terminals is a second number exceeding the first number case,
The time sync server,
Release the assignment to the time sync server of the client terminal for which the absolute time setting of the client terminal is completed, and assign a new client terminal unassigned to the time sync server as a time synchronization target to the time sync server Time synchronization between terminals and the simultaneous execution system of multiple terminals using the same.
delete delete A computer-readable recording medium comprising:
The computer-readable recording medium stores instructions for causing a computing device to perform the following steps, the steps of:
When the client terminal transmits the first signal to the server terminal and receives the second signal that is a response signal to the first signal transmitted from the server terminal that has transmitted the first signal, the transmission time of the first signal and the second signal a delay time calculation step of calculating a time delay time between the client terminal and the server terminal using the reception time;
a server timestamp receiving step of receiving, by the client terminal, a timestamp of the server terminal, which is a signal for absolute time transmitted from the server terminal; and
a timestamp setting step of the client terminal setting the absolute time of the client terminal to a value obtained by adding the time delay time calculated by the delay time calculation step to the timestamp of the server terminal received by the server timestamp receiving step; including,
The first signal corresponds to an 8-byte signal among data signals transmitted between the server terminal and the client terminal for transmission/reception of a control command from the client terminal to the server terminal or for environment setting in preparation for process execution, etc. It is one signal selected among all the signals,
After the timestamp setting step for all client terminals is performed according to the repetition of the timestamp setting step,
The server terminal controls the client terminal to execute the process at a preset execution time based on the synchronized time when there is a process to be simultaneously executed between at least two client terminals among the client terminals on which the timestamp setting step is performed. Further comprising; a process execution control step to
The process execution control step is
The server terminal selects the maximum delay time that is the largest value among the time delay times calculated for a plurality of client terminals that are the execution targets of the process to be executed simultaneously, and the process execution time is at least the maximum from the preset process execution command transmission time. the execution time setting step of setting the process execution time to be a later time than a value obtained by adding a delay time; and
a command transmission step of transmitting, by the server terminal, a control command for executing a process at the process execution time point at the time of the process execution command transmission time point, to a plurality of client terminals to be executed of the process; including,
When the target terminal for time synchronization is a terminal in a multiple client terminal environment rather than a server-client environment, a time synchronization server, which is a separate server for time synchronization, functions as the server terminal, but the time synchronization server is selected from any of the client terminals. one, and the maximum number of client terminals allocated to the time sync server and performing the delay time calculation step, the server timestamp receiving step and the timestamp setting step is a preset first number, and the number of the client terminals is When the second number exceeds the first number,
After execution of the timestamp setting step,
Terminal update in which the time sync server releases the assignment to the time sync server of the client terminal for which the timestamp setting step is completed, and allocates a new client terminal that is not allocated to the time sync server to the time sync server as a time synchronization target The computer-readable recording medium further comprising the step;

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