JP2018006866A - Control side device for controlling start time of predetermined function at controlled device, program and method - Google Patents

Abstract

Provided is a control-side device or the like that controls a start-up time of a predetermined function in a controlled-side device, thereby shortening the arrival time difference of a start signal signal and increasing the reception success rate. A control-side device that controls the activation time of a predetermined function in a controlled-side device using a wireless communication method, a trigger receiving unit that receives the generation of a predetermined trigger, and a predetermined time elapses from the time when the predetermined trigger is generated. It has a start time determining means for determining a later start time, a public information packet generating means for generating a public information packet including the start time, and a public information packet transmitting means for transmitting the public information packet by broadcast. Further, a plurality of controlled devices may be controlled to activate a predetermined function at the same time. The predetermined trigger may be a start instruction based on a user operation or a start instruction based on a machine operation programmed in advance. [Selection diagram] FIG.

Description

  The present invention relates to a technique for controlling a start time of a predetermined function in a controlled device from a control device.

Conventionally, there is a start signal system for race players (see, for example, Non-Patent Document 1). According to such a system, a starter terminal (control-side device) that transmits a start signal is connected to a dedicated start block (controlled device) installed at each start point of a player by a wired connection. Yes. The start block is, for example, an electronic device installed at a crouching start position in short-distance running. When a start signal is received, this generates a start sound (pistol firing sound) and switches the light display.
However, according to such a start signal system, there is a restriction that the starter terminal and the start block must be wired.

On the other hand, there is also a technology of a start management system in which a management device (starter terminal) and a start block are connected wirelessly (see, for example, Patent Document 1).
Generally, when connected wirelessly, the reception time of the start signal for each start block may be slightly different. Therefore, if a start sound is generated at the same time as the start block receives the start signal, the start sound between the start blocks may be shifted, and the players may not be able to start all at once.
According to the system described in Patent Literature 1, the management device transmits the scheduled start time to the start block. The start block that has received the scheduled start time sequentially propagates the scheduled start time to another adjacent start block. As a result, all start blocks can generate a start sound at the same time when the scheduled start time is reached.

Japanese Patent No. 4502747

Seiko Time System Co., Ltd., “Light Stimulation Start Signaling System [For Hearing Impaired]”, [online], [Search May 30, 2016], Internet <https://www.seiko-sts.co.jp /products/sports/cat01/001.html>

  According to the start management system described above, it is necessary to completely synchronize the start sound with a plurality of start blocks. However, since the start signal is transmitted from the management device to the start block via radio, a time difference (delay) is likely to occur. Because of the wireless connection, the interference signal in the surrounding environment may affect the start signal. If some start blocks fail to receive or retransmit the start signal, a synchronized start sound cannot be generated.

  In particular, when there are a plurality of start blocks, there is a problem that it takes a long time until all start blocks completely receive the start signal. There is also a problem that the time measurement accuracy decreases as the time from reception of the start signal to generation of the start sound increases.

  Regardless of the start signaling system described above, there is a case where it is desired to synchronize the activation times of predetermined functions from a single control-side device to a large number of controlled-side devices according to various applications. For example, it is assumed that a large number of controlled-side devices arranged in a large amusement park or concert venue activate the same function at the same time. For example, when the controlled device is a penlight to be given to a large number of spectators, it is possible to enhance the effect by controlling the lighting / extinction of these lights from a single controlling device.

  Therefore, the present invention provides a control-side device and a program that can shorten the arrival time difference of the start signal as much as possible and increase the reception success rate in order to control the start time of the predetermined function in the controlled-side device. And to provide a method.

According to the present invention, in the control-side device that controls the activation time of the predetermined function in the controlled-side device using a wireless communication method,
Trigger accepting means for accepting the occurrence of a predetermined trigger;
An activation time determining means for determining an activation time after the elapse of a predetermined time from the time when the predetermined trigger occurs;
A public information packet generating means for generating a public information packet including the start time;
It has a public information packet transmitting means for transmitting a public information packet by broadcast.

According to another embodiment of the control-side device of the present invention,
It is also preferable that a plurality of controlled devices control to activate a predetermined function at the same time.

According to another embodiment of the control-side device of the present invention,
The predetermined trigger is an activation instruction based on a user operation,
The control-side device is also preferably a smartphone, a tablet terminal, or a mobile terminal.

According to another embodiment of the control-side device of the present invention,
The predetermined trigger is also preferably an activation instruction based on a pre-programmed machine operation.

According to another embodiment of the control-side device of the present invention,
It is also preferable that the advertisement packet further includes an activation type for a predetermined function.

According to another embodiment of the control-side device of the present invention,
When the wireless communication method is a Bluetooth (registered trademark) short-range wireless communication method, the PR packet is an Advertising Packet, or
When the wireless communication system is a wireless LAN (Local Area Network) narrow-area wireless communication system, it is also preferable that the publicity packet is a broadcast message.

According to another embodiment of the control-side device of the present invention,
It is also preferable to transmit the public information packet by broadcast to the controlled device and to transmit the activation time by unicast using the data channel.

According to another embodiment of the control-side device of the present invention,
Between each controlled device, it has a time difference table that measures the arrival time difference of data packets by broadcast and unicast,
It is also preferable to transmit the activation time by unicast in order from the controlled device having the longest arrival time difference of data packets in unicast using the time difference table.

According to another embodiment of the control-side device of the present invention,
For each controlled device, derive the shortest arrival time difference to reach in either broadcast or unicast,
It is also preferable that the predetermined time is set to be the activation time that has elapsed from the longest shortest arrival time difference among all the controlled devices.

According to another embodiment of the control-side device of the present invention,
For each controlled device, derive the longest arrival time difference reached in both broadcast and unicast,
It is also preferable that the predetermined time is set to be the activation time that has elapsed from the longest longest arrival time difference among all the controlled devices.

According to another embodiment of the control-side device of the present invention,
It is also preferable to further include time adjusting means for adjusting the time with the controlled device.

According to the present invention, there is provided a system having the above-described control-side device and a controlled-side device capable of communicating via a wireless communication method,
The controlled device is
When receiving a public information packet, a time measuring means for measuring until the start time included in the public information packet,
And an activation means for activating a predetermined function when the activation time is reached.

According to another embodiment of the system of the present invention,
For controlled devices
The predetermined function is timer start,
It is preferable to further include stopwatch means for clearly indicating the time from the timer start to the timer stop when a timer stop instruction based on a user operation or a machine operation is generated.

According to the present invention, in a control-side program for causing a computer mounted on a device that controls a start time of a predetermined function in a controlled-side device to function using a wireless communication method,
Trigger accepting means for accepting the occurrence of a predetermined trigger;
An activation time determining means for determining an activation time after the elapse of a predetermined time from the time when the predetermined trigger occurs;
A public information packet generating means for generating a public information packet including the start time;
A computer is caused to function as a public information packet transmitting means for transmitting a public information packet by broadcast.

  According to the control-side device, program, and method of the present invention, in order to control the start time of the predetermined function in the controlled-side device, the arrival time difference of the start signal is shortened as much as possible, and the reception success rate is increased. be able to.

It is explanatory drawing of the start signal system in this invention. It is a functional block diagram of the control side apparatus and controlled apparatus in this invention. It is a basic sequence diagram in the present invention. It is the sequence diagram which combined the broadcast and unicast in this invention. It is a sequence diagram which measures the time difference until the packet which the control side apparatus transmitted is received by the controlled side apparatus. It is a sequence diagram which does not control the priority of the unicast packet based on a time difference. It is the 1st sequence diagram which controlled the priority of the unicast packet based on a time difference. It is the 2nd sequence diagram which controlled the priority of the unicast packet based on a time difference. It is a sequence diagram in the case of the number of simultaneous connections M = 1 of unicast packets. It is a sequence diagram in case the number of simultaneous connections M = 2 of unicast packets. It is a sequence diagram in case the number of simultaneous connections M = 3 of unicast packets.

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

  FIG. 1 is an explanatory diagram of a start signal system according to the present invention.

  According to FIG. 1, the start signal system comprises a control side device 1 and one or more controlled side devices 2. The control-side device 1 is a terminal operated by, for example, a starter referee, and the controlled-side device 2 is a terminal that signals a start to a player, for example. The control-side device 1 controls all the controlled-side devices 2 so as to activate a predetermined function at the same time. These terminals may be general-purpose smartphones, tablet terminals, or portable terminals that are connected to each other by wireless links. Therefore, it is not necessary to install dedicated devices as the control-side device 1 and the controlled-side device 2. In addition, since the control-side device 1 and the controlled-side device 2 are connected wirelessly, there is no need to lay a wire.

  As a wireless link between the control-side device 1 and the controlled-side device 2, a short-range wireless communication method (for example, Bluetooth (registered trademark) or Zigbee (registered trademark)) or a narrow-range wireless communication method (for example, a wireless LAN) is used. It is preferable. Of course, it is not limited to these wireless communication systems. In the case of Bluetooth, BLE (Bluetooth Low Energy) may be used. BLE has been standardized as “low power consumption version Bluetooth” by “Bluetooth SIG”, which is a specification formulation organization of the short-range wireless standard Bluetooth. Note that iBeacon (registered trademark) based on Apple's iOS is also based on BLE.

Examples of start cues generated by the controlled device 2 are as follows.
“On Your Marks”->“Set”-> “Go!”
“Go!” As a start signal may be a pistol firing sound, or may be a switch of light display for the hearing impaired.

  Also, according to FIG. 1, the start signal is transmitted not only to the controlled devices 2A to 2C installed at the start point, but also to the controlled device 2D that measures time at the goal point. The controlled device 2D can automatically start time measurement from the time of “Go!”.

  Further, although not shown, the controlled-side device 2 may be a light toy / sounding character toy device possessed by a visitor in the case of an amusement park, for example. For example, in the case of an outdoor concert venue, it may be a penlight device held by the audience. The control-side device 1 can simultaneously control a number of controlled-side devices 2 possessed by a number of users, such as lighting / extinguishing / starting / stopping.

FIG. 2 is a functional configuration diagram of the control-side device and the controlled-side device in the present invention.
FIG. 3 is a basic sequence diagram in the present invention.

<Control-side device 1>
According to FIG. 2, the control-side device 1 controls the activation time of a predetermined function in the controlled-side device 2 via wireless. The control-side device 1 includes a time adjustment unit 10, a trigger reception unit 11, an activation time determination unit 12, a public information packet generation unit 13, and a public information packet transmission unit 14. These functional components are realized by executing a program that causes a computer mounted on a control-side device (for example, a smartphone) to function.

[Time adjustment unit 10]
The time adjustment unit 10 synchronizes the internal clock with an accurate time, and specifically uses NTP (Network Time Protocol). NTP is a protocol that inquires an NTP server about the current time via UDP (User Datagram Protocol) and sets an accurate time in consideration of a communication delay in an internal clock. The NTP server forms a hierarchical structure, and the control-side device 1 can access a lower-level NTP server disclosed by a communication carrier.

[Trigger accepting unit 11 (S1)]
The trigger acceptance unit 11 accepts the occurrence of a predetermined trigger as follows.
(1) Activation instruction based on user operation The user can generate an activation instruction trigger by tapping a GUI (Graphic User Interface) button displayed on a smartphone display, for example. For example, in the case of a start signal, the referee of the starter taps the “Set” button displayed on the smartphone with “Set”.
(2) Activation instruction based on pre-programmed machine operation For example, an activation instruction trigger can be automatically generated according to music by a smartphone application. For example, in the case of a concert venue, lighting / extinction of light emitting devices held by many spectators can be controlled in synchronization with music.

[Activation Time Determination Unit 12 (S2)]
The activation time determination unit 12 determines the activation time (t + T) after the elapse of a predetermined time (T) from the time t when the predetermined trigger occurs. “Activation time” means the time at which the controlled device 2 activates a predetermined function. The activation time means a time obtained by adding a predetermined time T (for example, T = 2 seconds) to a time t when a predetermined trigger is generated.

The predetermined time T is preset as a fixed value. For example, in a short-distance race, if the time interval from “Set” to “Go!” Is 2 seconds, “Set” triggers a predetermined trigger. Occurs, and 2 seconds after that time is determined as the start time.
Specifically, the predetermined time T may be a value obtained by multiplying the longest arrival time by α (α ≧ 1.0) times. The longest arrival time is a time during which the start signal transmitted from the control side device 1 is received by all the controlled side devices 2.

  Since the start signal transmitted from the control-side device 1 via wireless communication is affected by the interference radio waves in the surrounding environment, the reception time may be slightly different for each controlled-side device 2. Therefore, the reception time of the start signal cannot be set as the start signal time as it is. An activation time that is after the elapse of the transmission time (future time) is determined, and control is performed so that a predetermined function is activated as a start signal all at once at the activation time.

[PR packet generator 13 (S3)]
The public information packet generator 13 generates a public information packet including the start time as a start signal.
(1) When the wireless communication method is a Bluetooth (registered trademark) short-range wireless communication method, "Advertising Packet" is used as a publicity packet.
(2) When the wireless communication method is a wireless LAN (Local Area Network) narrow-area wireless communication method, a “broadcast message” is used as a public relation packet.
These advertisement packets can be transmitted to a large number of controlled devices 2 in a broadcast manner.

  In the case of Bluetooth Advertising Packet, as is apparent from FIG. 2, there is a payload part of a maximum of 37 bytes. Each time the control-side device 1 transmits the publicity packet of the present invention, the control side device 1 includes the activation time (t + T) in the payload portion. In other words, the time information included in the PR packet of the present invention is not fixed, but is updated future time each time.

  Further, the public information packet may further include a “activation type” for a predetermined function. For example, the activation type may be “pistol firing sound” or “light display switching”. Further, the start type may be a different start signal type such as Set or Go. In the controlled-side device 2, a predetermined function corresponding to the activation type included in the PR packet is activated at the activation time.

[Publicity packet transmitter 14 (S4)]
The public information packet transmitter 14 transmits the public information packet by broadcast. For example, according to Bluetooth Advertising Packet, transmission can be performed immediately without establishing a wireless link. According to the Bluetooth standard, the control-side device 1 functions as “advertiser”, and the controlled-side device 2 functions as “scanner”.

(Double transmission of PR packet)
As another embodiment, the advertisement packet may be simultaneously transmitted by both the Bluetooth Advertising Packet and the wireless LAN broadcast message. For example, by transmitting an Advertising Packet in the 2.4 MHz band for Bluetooth and transmitting a broadcast message in the 5 GHz band, it is possible to prevent radio waves from interfering as much as possible. Moreover, even if it is influenced by interference in one frequency band depending on the surrounding environment, it is not affected by interference in the other frequency band, and the success rate of receiving the publicity packet in the controlled side device 2 can be increased.

(Selective transmission of PR packet)
As another embodiment, for each of Bluetooth and wireless LAN, the time difference until the PR packet from the control side device 1 is received by all the controlled side devices 2 is measured, and the Bluetooth with the shorter time difference is measured. Alternatively, one of the wireless LANs may be used.

(Repeat transmission of PR packet)
Furthermore, as another embodiment, the same Bluetooth advertising packet as a publicity packet may be transmitted many times at a predetermined time interval (for example, every 0.1 second). This is to increase the reception success rate for the controlled device 2 as much as possible.

<Controlled device 2>
The controlled-side device 2 includes a time adjusting unit 20, a public information packet receiving unit 21, a time measuring unit 22, an activation unit 23, and a stopwatch unit 24. These functional components are realized by executing a program that causes a computer mounted on the controlled device to function.

[Time adjustment unit 20]
The time adjustment unit 20 is exactly the same as the time adjustment unit 10 of the control-side device 1 described above.

[PR packet receiver 21]
The public information packet receiving unit 21 receives the public information packet from the control side device 1 via radio. The advertisement packet is basically received by a broadcast packet (advertising channel), but may be received by a unicast packet (data channel). When either one of the packets is received, the activation time (and activation type) is acquired from the payload portion of the packet, and the activation time is output to the timer unit 22. For example, if a unicast packet is received even if a broadcast PR packet is not received, the activation time is output to the time measuring unit 22.

[Timekeeping unit 22]
The timer 22 keeps timing until the start time (t + T) input from the public information packet receiver 21. It can be said that the shorter the time is measured, the higher the accuracy of the internal clock is.

[Starting unit 23]
The activation unit 23 activates the predetermined function unit 24 when the timing unit 22 reaches the activation time. The predetermined function may be a firing sound at the start of a race, or light display switching.

[Stopwatch 24]
When an instruction for timer stop based on a user operation or machine operation is generated, the stopwatch unit 24 clearly indicates the time from the timer start (starting time) to the timer stop. The stopwatch unit 24 automatically starts a timer by starting a predetermined function, for example, at the moment of starting a race, and stops the timer by a user operation when the player finishes. For example, as shown in FIG. 1 described above, the time from the start of the race to the goal can be measured.

  FIG. 4 is a sequence diagram combining broadcast and unicast in the present invention.

  S1 to S3 in FIG. 4 are exactly the same as S1 to S3 in FIG. According to FIG. 4, compared with FIG. 3, the control-side device 1 transmits a broadcast packet to the controlled-side device 2 by broadcast (S41) and unicast (S42). Of course, when transmitting by unicast, it may be transmitted in the format of a publicity packet, or only the start time (t + T) of the payload part may be transmitted.

  In the case of broadcasting, regardless of the number of controlled devices 2, the arrival time difference from the controlling device 1 to the controlled device 2 can be kept small. Further, by applying unicast, it is possible to increase the packet reception success rate including the activation time from the controlling device 1 to each controlled device 2.

  In the case of Bluetooth Low Energy, broadcast (advertising channel) and unicast (data channel) use different frequency bands. For this reason, depending on the interference radio waves in the surrounding environment, there is a high possibility of reaching by unicast even when the arrival fails by broadcasting. Of course, the reverse is also true.

  Furthermore, according to S42 of FIG. 4, the control-side apparatus 1 may simply transmit unicast packets to the controlled-side apparatuses 2A to 2D in order. However, by determining the transmission order according to the time difference from the control-side device 1 to each of the controlled-side devices 2A to 2D, the arrival time difference for all the controlled-side devices 2A to 2D is suppressed, and the reception success rate Can be increased.

  FIG. 5 is a sequence diagram for measuring a time difference until a packet transmitted by the control side device is received by the controlled side device. According to FIG. 5, in the case of Bluetooth, the vertical axis represents the passage of time.

First, the control-side device 1 transmits a transmission time t0 that is its current time to the controlled-side device 2 by advertising packet (broadcast).
The controlled device 2A returns a time difference TBa = ta0−t0 between the transmission time t0 included in the received Advertising Packet and the receiving time ta of the Advertising Packet to the control device 1. Similarly, for each controlled device 2B to 2D, the time difference TBb to TBd between the transmission time included in the received Advertising Packet and the receiving time of the Advertising Packet is returned to the control device 1.
The control-side device 1 may execute these sequences a plurality of times for each of the controlled-side devices 2A to 2D and measure the maximum time difference or the average time difference.

Next, the control-side device 1 transmits a transmission time t1 that is its current time to the controlled-side device 2A by a data channel (unicast). The controlled device 2A returns a time difference TUa = ta1-t1 between the transmission time t1 included in the received data channel and the reception time ta1 of the data channel to the control device 1. Similarly for each controlled device 2B (2C, 2D), the time difference TUb between the transmission time t2 (t3, t4) included in the received data channel and the reception time tb2 (tc3, td4) of the data channel tb2-t2 (TUc = tc3-t3, TUd = td4-t4) is returned to the control side apparatus 1.
The control-side device 1 may execute these sequences a plurality of times for each of the controlled-side devices 2A to 2D and measure the maximum time difference or the average time difference. Of course, the measurement order of the time difference with respect to each controlled device 2 does not matter.

Finally, the control-side device 1 creates a “time difference table” in which the arrival time difference of the data packet is measured by broadcast and unicast with each of the controlled-side devices 2A to 2D.
According to FIG. 5, the time difference between broadcast packets is the shortest for the controlled device A (0.1 seconds) and the longest for the controlled device D (0.9 seconds).
Further, the time difference of the unicast packet is the shortest in the controlled device D (0.2 seconds) and the longest in the controlled device A (0.6 seconds).

<Transmission priority in unicast packets>
In the time difference table of FIG. 5, “shortest arrival time difference” and “longest arrival time difference” are further represented for each controlled device.
(1) “Shortest arrival time difference” represents a shorter time difference by comparing a time difference between broadcast packets and a time difference between unicast packets. This means the time difference that arrives by either broadcast or unicast for each controlled device. The shortest arrival time difference can be used to determine which packet should be transmitted in order to shorten the desired arrival time difference.
(2) “Longest arrival time difference” indicates a longer time difference by comparing a time difference between broadcast packets and a time difference between unicast packets. This means the time difference that is reached in both broadcast and unicast. The longest arrival time difference can be used for the determination to increase the reception success rate by receiving both packets.

  As the simplest method for determining the transmission priority, the control-side apparatus 1 transmits unicast packets in order from the controlled-side apparatus having the longest arrival time difference of the unicast packets using the time difference table.

<Determining the predetermined time T>
As described above, the activation time (t + T) is obtained by adding the predetermined time T to the generation time t of the predetermined trigger.
(1) When it is desired to shorten the time difference between the predetermined trigger occurrence time t and the activation time (t + T), the “predetermined time” is longer than the longest “shortest arrival time difference” among all the controlled devices 2. Set the startup time to be the same.
(2) When it is desired that all controlled devices 2 receive both broadcast packets and unicast packets to increase the reception success rate, the “predetermined time” is the highest among all controlled devices 2. The start time is set to be longer than the long “longest arrival time difference”.

  FIG. 6 is a sequence diagram in which the priority of the unicast packet based on the time difference is not controlled. According to FIG. 6, the vertical axis represents the passage of time.

  According to FIG. 6, the control-side device 1 simply transmits unicast packets in the order of controlled-side devices 2A-> 2B-> 2C-> 2D using the time difference table of FIG. The transmission priority is not controlled.

  Using the time difference table in FIG. 5, the desired arrival time difference N is set to 0.5 seconds. Further, regarding the control-side apparatus 1, it is assumed that transmission of broadcast packets requires 0.1 second intervals and transmission of unicast packets also requires 0.1 second intervals.

According to FIG. 6, the reception success rate at the desired arrival time difference N = 0.5 for all the controlled devices 2 is expressed as follows.
Success rate of receiving broadcast packets
Success rate of receiving unicast packets
Successful reception rate using both broadcast and unicast packets
= 0.25
When the desired arrival time difference N = 0.5, it is clear that the reception success rate using both broadcast packets and unicast packets is the highest.
According to FIG. 6, it can be understood that an arrival time difference N = 0.7 seconds is necessary for all controlled devices 2 to receive either one of the broadcast packet and the unicast packet.

The “reception success rate” may be a ratio of the desired arrival time difference N to the packet measurement time difference, for example.
Reception success rate = desired arrival time difference N / measurement time difference
(If 1.0 or higher, set 1.0)
Of course, the reception success rate may be based on other calculation methods.

  FIG. 7 is a first sequence diagram in which the priority of the unicast packet based on the time difference is controlled. According to FIG. 7, the vertical axis represents the passage of time.

According to FIG. 7, the control-side device 1 determines the unicast transmission priority for each controlled-side device 2 using the time difference table of FIG. After setting the desired arrival time difference N, for example, the transmission priority is determined based on the following rules.
(Rule 1) Unicast transmission is prioritized (the transmission priority is higher) for controlled devices whose transmission time difference by broadcasting is N seconds or more.
(Rule 2) When there are a plurality of controlled devices to be preferentially transmitted according to rule 1, transmission is performed preferentially in order from the controlled device having a long transmission time difference.
As a result, it is possible to control so that the transmission time difference of unicast in all controlled devices becomes short, and the reception success rate within the desired arrival time difference N in broadcast and unicast can be increased.

  Using the time difference table in FIG. 5, the desired arrival time difference N is set to 0.5 seconds. Further, regarding the control-side apparatus 1, it is assumed that the transmission of broadcast packets requires an interval of 0.1 seconds, and the transmission interval of unicast packets also requires an interval of 0.1 seconds.

According to rule 1, the controlled devices 2C and 2D are 0.7 seconds and 0.9 seconds at the maximum in the broadcast packet, and N is longer than 0.5 seconds. In this case, controlled devices 2C and 2D are controlled so as to preferentially transmit unicast packets.
Further, according to rule 2, the controlled side device 2C takes a maximum of 0.4 seconds for unicast transmission, and the controlled side device 2D takes a maximum of 0.2 seconds for unicast transmission. Therefore, transmission in unicast is performed in the order of the controlled device 2C-> 2D having a long time.

According to controlled devices 2A and 2B, the time difference between broadcast packets can be expected to be 0.5 seconds or less, but transmission is also performed by unicast to increase the reception success rate. Also in this case, the transmission priority is determined according to rule 2.
Finally, the priority order for unicast transmission. It becomes as follows.
2C->2D->2A-> 2B

  Note that the desired arrival time difference is determined such that when the rules 1 and 2 are applied, the time T at which all the controlled devices 2 can expect reception is minimized. In the case of the time difference table of FIG. 5, N = 0.5 is suitable as a solution.

According to FIG. 7, the reception success rate at the desired arrival time difference N = 0.5 for all the controlled devices 2 is expressed as follows.
Success rate of receiving broadcast packets
Success rate of receiving only unicast packets = 0.10
Successful reception rate using both broadcast and unicast packets
= 0.71
When the desired arrival time difference N = 0.5, it is clear that the reception success rate using both broadcast packets and unicast packets is the highest.

  FIG. 8 is a second sequence diagram in which the priority of the unicast packet based on the time difference is controlled.

According to FIG. 8, compared with FIG. 7, the desired arrival time difference N is set to 0.3 seconds.
According to Rule 1, the controlled side devices 2B, 2C, and 2D have a maximum broadcast time of 0.4 seconds, 0.7 seconds, and 0.9 seconds, and N is longer than 0.3 seconds. In this case, the controlled side devices 2B, 2C, and 2D are controlled so as to preferentially transmit in unicast packets.
Further, according to Rule 2, the controlled side device 2B has a maximum of 0.4 seconds for unicast transmission, the controlled side device 2C has a maximum of 0.4 seconds for unicast transmission, and the controlled side device 2D has a maximum for unicast transmission. It takes 0.3 seconds. For this purpose, transmission in unicast is performed in the order of controlled devices 2C->2B-> 2D having a long time.
Finally, the priority order for unicast transmission. It becomes as follows.
2C->2B->2D-> 2A
In this case, the time T at which all the controlled devices 2 can receive either broadcast or unicast is 0.6 seconds when the controlled device 2D receives the unicast packet.
Considering that, the time T at which all controlled devices 2 can receive either broadcast or unicast is the desired arrival time difference N in FIG. 8 when the desired arrival time difference N = 0.5. = Less than 0.3 seconds.

FIG. 9 is a sequence diagram when the number of simultaneous connections M of unicast packets is M = 1.
FIG. 10 is a sequence diagram when the number of simultaneous connections M of unicast packets is M = 2.
FIG. 11 is a sequence diagram when the number of simultaneous connections M of unicast packets is M = 3.

9 to 11 show a case where the number M of simultaneous connections with the controlled-side device 2 is limited for the transmission of unicast packets.
According to FIG. 9, the number of simultaneous connections M = 1, and only one unicast packet can be transmitted. In this case, a time difference of 1.7 seconds is required until all controlled devices 2 receive both the broadcast packet and the unicast packet.
According to FIG. 10, the number of simultaneous connections M = 2, and up to two unicast packets can be transmitted simultaneously. In this case, a time difference of 1.0 seconds is required until all controlled devices 2 receive both broadcast and unicast packets.
According to FIG. 11, the number of simultaneous connections M = 3, and up to three unicast packets can be transmitted simultaneously. In this case, a time difference of 0.9 seconds is required until all controlled devices 2 receive both broadcast packets and unicast packets.

As described above in detail, according to the control-side device, program, and method of the present invention, in order to control the start time of the predetermined function in the controlled-side device, the arrival time difference of the start signal is made as short as possible. And the reception success rate can be increased.
That is, the time measurement accuracy can be increased by shortening the time difference between the occurrence time t of the predetermined trigger and the activation time (t + T), and the reception success rate can be increased by using broadcast packets and unicast packets. .

  Various changes, modifications, and omissions of the above-described various embodiments of the present invention can be easily made by those skilled in the art. The above description is merely an example, and is not intended to be restrictive. The invention is limited only as defined in the following claims and the equivalents thereto.

DESCRIPTION OF SYMBOLS 1 Control side apparatus 10 Time adjustment part 11 Trigger reception part 12 Startup time determination part 13 Public information packet generation part 14 Public information packet transmission part 2 Controlled side apparatus 20 Time adjustment part 21 Public information packet reception part 22 Timekeeping part 23 Start part 24 Stopwatch Part

Claims (14)

In the control side device that controls the start time of the predetermined function in the controlled side device using the wireless communication method,
Trigger accepting means for accepting the occurrence of a predetermined trigger;
An activation time determining means for determining an activation time after the elapse of a predetermined time from the time when the predetermined trigger occurs;
A public information packet generating means for generating a public information packet including the start time;
A control-side apparatus comprising: a publicity packet transmission unit that transmits the publicity packet by broadcast. The control-side device according to claim 1, wherein a plurality of controlled-side devices are controlled to activate a predetermined function at the same time. The predetermined trigger is an activation instruction based on a user operation,
The control-side device according to claim 1, wherein the control-side device is a smartphone, a tablet terminal, or a mobile terminal. The control-side apparatus according to claim 1, wherein the predetermined trigger is a start instruction based on a machine operation programmed in advance. The control-side apparatus according to claim 1, wherein the public information packet further includes an activation type for a predetermined function. When the wireless communication method is a Bluetooth (registered trademark) short-range wireless communication method, the PR packet is an Advertising Packet, or
6. The control-side apparatus according to claim 1, wherein when the wireless communication system is a wireless LAN (Local Area Network) narrow-area wireless communication system, the advertisement packet is a broadcast message. . The control side according to any one of claims 1 to 6, wherein the public information packet is transmitted by broadcast to the controlled device, and the activation time is transmitted by unicast using a data channel. apparatus. Between each controlled device, it has a time difference table that measures the arrival time difference of data packets by broadcast and unicast,
8. The control side device according to claim 7, wherein the activation time is transmitted by unicast in order from the controlled side device having the longest arrival time difference of data packets in unicast using the time difference table. For each controlled device, derive the shortest arrival time difference to reach in either broadcast or unicast,
9. The control-side device according to claim 8, wherein the predetermined time is set to be an activation time that has passed the longest shortest arrival time difference among all the controlled-side devices. For each controlled device, derive the longest arrival time difference reached in both broadcast and unicast,
9. The control-side device according to claim 8, wherein the predetermined time is set to be an activation time that has elapsed from the longest longest arrival time difference among all the controlled-side devices.   The control-side device according to any one of claims 1 to 10, further comprising a time adjusting unit that adjusts the time with the controlled-side device. A system comprising the controlling device according to any one of claims 1 to 11 and a controlled device capable of communicating via a wireless communication method,
The controlled device is
When receiving the public information packet, a time measuring means for measuring the time until the start time included in the public information packet,
And a starting unit that starts a predetermined function when the starting time is reached. About the controlled device
The predetermined function is a timer start,
13. The system according to claim 12, further comprising stopwatch means for clearly indicating a time from a timer start to a timer stop when a timer stop instruction based on a user operation or a machine operation is generated. In the control-side program that causes the computer mounted in the device that controls the start time of the predetermined function in the controlled-side device to use the wireless communication method,
Trigger accepting means for accepting the occurrence of a predetermined trigger;
An activation time determining means for determining an activation time after the elapse of a predetermined time from the time when the predetermined trigger occurs;
A public information packet generating means for generating a public information packet including the startup time;
A control-side program that causes a computer to function as a public information packet transmission unit that transmits the public information packet by broadcast.

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