JP2018117224A - Wireless communication control method, wireless communication control device, and wireless communication control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid congestion of a wireless communication network.SOLUTION: A wireless communication control device acquires the radio field intensity between its own terminal and each of a plurality of terminals and counts the number of strong connection terminals which are the other terminals in each of which the radio wave intensity is equal to or higher than a threshold value, selects a representative terminal from among the plurality of terminals in descending order of the number of strongly connected terminals, sets a group including the representative terminal and the strong connection terminal, and instructs the representative terminal included in the group to perform multi-address transmission of a first control signal for controlling the terminals included in the group.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a wireless communication control method, a wireless communication control device, and a wireless communication control program.

  In recent wireless communication networks, wireless communication in which a plurality of terminals mutually transfer control signals from the GW device in order to eliminate communication restrictions depending on the distance between the GW (Gateway) device and each terminal. Development of the method is underway. Such a wireless communication system is called a wireless multi-hop communication system.

JP 2016-12916 A JP 2009-206837 A

  In the wireless multi-hop communication method, from the viewpoint of controlling a plurality of terminals simultaneously, control signals may be transmitted from the GW apparatus to the plurality of terminals at the same time. When control signals are transmitted from a GW device to a plurality of terminals at the same time, the control signals may collide with each other as the control signals are transferred.

  Thus, in order to avoid control signal collision, it is conceivable to use, for example, a broadcast address designating an unspecified terminal as a destination address of control signals transmitted all at once. However, if a control signal is transmitted to a plurality of terminals at the same time using a broadcast address, the wireless communication bandwidth consumed by the transfer of the control signal increases, resulting in congestion of the wireless communication network. There is a fear.

  It is an object of the disclosed technology to provide a wireless communication control method, a wireless communication control apparatus, and a wireless communication control program that can avoid congestion of a wireless communication network.

  In one aspect, a wireless communication control method disclosed in the present application is a wireless communication control method in a wireless communication control apparatus that wirelessly communicates with a plurality of terminals. Radio field strength between the terminal and the plurality of terminals, and for each of the plurality of terminals, count the number of strongly connected terminals that are the other terminals whose radio field intensity is greater than or equal to a threshold, and the number of the strongly connected terminals is Broadcasting of a first control signal for selecting a representative terminal from the plurality of terminals in descending order, setting a group including the representative terminal and the strongly connected terminal, and controlling the terminals included in the group To the representative terminal included in the group.

  According to one aspect of the wireless communication control method disclosed in the present application, there is an effect that congestion of the wireless communication network can be avoided.

FIG. 1 is a diagram illustrating a configuration example of a wireless communication network including a GW apparatus according to the first embodiment. FIG. 2 is a diagram illustrating a mode of wireless communication between the GW apparatus and each terminal according to the first embodiment. FIG. 3 is a diagram illustrating a configuration example of the GW apparatus according to the first embodiment. FIG. 4 is a diagram for explaining details of processing by the counting unit and the group setting unit in the first embodiment. FIG. 5 is a flowchart illustrating the processing procedure of the GW apparatus according to the first embodiment. FIG. 6 is a diagram illustrating a configuration example of the GW apparatus according to the second embodiment. FIG. 7 is a diagram illustrating a configuration example of the GW apparatus according to the third embodiment. FIG. 8 is a diagram illustrating an aspect of wireless communication between the GW apparatus and each terminal according to the third embodiment. FIG. 9 is a diagram illustrating a hardware configuration example of the GW apparatus.

  Embodiments of a wireless communication control method, a wireless communication control apparatus, and a wireless communication control program disclosed in the present application will be described below in detail with reference to the drawings. The disclosed technology is not limited by this embodiment.

  FIG. 1 is a diagram illustrating a configuration example of a wireless communication network including the GW apparatus 10 according to the first embodiment. The wireless communication network illustrated in FIG. 1 includes a GW apparatus 10 and terminals 100a to 100k. The GW apparatus 10 and the terminals 100a to 100k are connected to each other wirelessly. The GW apparatus 10 communicates wirelessly with the terminals 100a to 100k. In the following description, when the terminals 100a to 100k are not particularly distinguished, the terminals 100a to 100k are collectively referred to as “terminal 100”.

  The GW apparatus 10 acquires the radio field strength between the terminal 100 and another terminal for each of the plurality of terminals 100. For each of the plurality of terminals 100, the GW apparatus 10 counts the number of strongly connected terminals that are other terminals whose radio field intensity is equal to or greater than a threshold value. The GW apparatus 10 selects a representative terminal from the plurality of terminals 100 in the descending order of the number of strongly connected terminals, and sets a group including the representative terminal and the strongly connected terminals. Then, the GW apparatus 10 instructs the representative terminal included in the group to broadcast the first control signal for controlling the terminal included in the group. On the other hand, the GW apparatus 10 transmits a second control signal for controlling the terminal 100 to the terminals 100 not included in the group among the plurality of terminals 100.

  FIG. 2 is a diagram illustrating an aspect of wireless communication between the GW apparatus 10 and each terminal 100 according to the first embodiment.

  As illustrated in FIG. 2, the GW apparatus 10 selects a representative terminal having the largest number of strongly connected terminals from the terminals 100a to 100k, and sets a group G1 including the representative terminal and the strongly connected terminals. . In the example of FIG. 2, it is assumed that the number of strongly connected terminals of the terminal 100f among the terminals 100a to 100k is “5”, which is the largest. Further, it is assumed that the strongly connected terminals of the terminal 100f are the terminal 100b, the terminal 100c, the terminal 100e, the terminal 100g, and the terminal 100k. In this case, the GW apparatus 10 selects the terminal 100f as a representative terminal, and selects a group G1 including the terminal 100f and the terminals 100b, 100c, 100e, 100g, and 100k that are strongly connected terminals of the terminal 100f. Set.

  Subsequently, the GW apparatus 10 selects a representative terminal having the largest number of strongly connected terminals from the terminals 100a, 100d, 100h, 100i, and 100j other than the terminals included in the group G1, and selects the representative terminal A group G2 including terminals and strongly connected terminals is set. In the example of FIG. 2, among the terminals 100a, 100d, 100h, 100i, and 100j other than the terminals included in the group G1, the number of strongly connected terminals of the terminal 100i is “2”, which is the largest. To do. Further, it is assumed that the strongly connected terminals of the terminal 100i are the terminal 100h and the terminal 100j. In this case, the GW apparatus 10 selects the terminal 100i as a representative terminal, and sets a group G2 including the terminal 100i and the terminals 100h and 100j that are strongly connected terminals of the terminal 100i.

  The GW apparatus 10 repeatedly generates a group until only the terminal 100 in which the number of strongly connected terminals is 0 remains. In the example of FIG. 2, it is assumed that the number of strongly connected terminals of the terminal 100a and the terminal 100d is 0, and the terminal 100a and the terminal 100d remain as the terminals 100 not included in the group.

  Then, the GW apparatus 10 instructs the representative terminal included in the group to broadcast the first control signal for controlling the terminal included in the group. In the example of FIG. 2, the GW apparatus 10 instructs the transmission of the first control signal to the terminal 100f that is the representative terminal included in the group G1 and the terminal 100i that is the representative terminal included in the group G2. . Thereby, in the group G1, the first control signal is broadcast from the terminal 100f, which is the representative terminal, to the terminal 100f, the terminal 100b, the terminal 100c, the terminal 100e, the terminal 100g, and the terminal 100k. In the group G2, the second control signal is broadcast from the terminal 100i, which is the representative terminal, to the terminal 100i, the terminal 100h, and the terminal 100j.

  Further, the GW apparatus 10 transmits a second control signal for controlling the terminal 100 to the terminals 100 not included in the group among the plurality of terminals 100. In the example of FIG. 2, the GW apparatus 10 transmits a second control signal to the terminals 100 a and 100 d that are the terminals 100 not included in the group.

  In this way, the GW apparatus 10 selects a representative terminal from the plurality of terminals 100 in descending order of the number of strongly connected terminals, sets a group including the representative terminal and the strongly connected terminals, and selects the terminals in the group. The representative terminal in the group is instructed to broadcast the first control signal to be controlled. As a result, compared to a wireless multi-hop communication method in which a plurality of terminals mutually transfer control signals from the GW device, it is possible to suppress the consumption of the wireless communication band, and as a result, avoid congestion of the wireless communication network. can do.

  Next, a configuration example of the GW apparatus 10 illustrated in FIG. 1 will be described. FIG. 3 is a diagram illustrating a configuration example of the GW apparatus 10 according to the first embodiment. As illustrated in FIG. 3, the GW apparatus 10 includes a radio wave intensity acquisition unit 11, a counting unit 12, a group setting unit 13, and a broadcast control unit 14.

  The radio wave intensity acquisition unit 11 acquires the radio wave intensity between each terminal 100 and another terminal. For example, the radio wave intensity acquisition unit 11 collects the radio wave intensity list from each terminal 100 when each terminal 100 holds a radio wave intensity list between each terminal 100 and another terminal. The radio field intensity between the terminal 100 and another terminal is acquired. The radio wave intensity acquisition unit 11 is an example of an acquisition unit.

  For each terminal 100, the counting unit 12 counts the number of strongly connected terminals that are other terminals whose radio field intensity is equal to or greater than a threshold value.

  An example of processing in which the counting unit 12 counts the number of strongly connected terminals will be described. The counting unit 12 receives a list of radio wave intensity collected from each terminal 100 from the radio wave intensity acquisition unit 11. The counting unit 12 uses the received radio wave intensity list to create a radio wave intensity matrix that stores the radio wave intensity between all the terminals 100 in the wireless communication network. The counting unit 12 compares the created radio wave intensity matrix with a threshold value, and for each terminal 100, extracts another terminal having a radio wave intensity equal to or greater than the threshold value as a strong connection terminal from the radio wave intensity matrix, thereby establishing a strong connection. Count the number of terminals. Information indicating the number of strongly connected terminals for each terminal 100 counted by the counting unit 12 is output to the group setting unit 13 together with the radio wave intensity matrix.

  The group setting unit 13 selects a representative terminal from the plurality of terminals 100 in the descending order of the number of strongly connected terminals, and sets a group including the representative terminal and the strongly connected terminals. The group setting unit 13 is an example of a setting unit.

  An example of processing in which the group setting unit 13 sets a group will be described. The group setting unit 13 refers to the radio wave intensity matrix, selects a representative terminal having the largest number of strongly connected terminals from all the terminals 100 in the wireless communication network, and selects the representative terminal and the strongly connected terminals. Set the group to include. Subsequently, the group setting unit 13 selects a representative terminal having the largest number of strongly connected terminals from the terminals 100 other than the terminals included in the set group, and includes the representative terminal and the strongly connected terminals. Set. The group setting unit 13 sets a group repeatedly until only the terminal 100 with the number of strongly connected terminals is 0 remains. Information indicating the group set by the group setting unit 13 is output to the broadcast control unit 14.

  Details of processing by the counting unit 12 and the group setting unit 13 will be described later.

  The broadcast control unit 14 instructs the representative terminal included in the group to perform broadcast transmission of the first control signal for controlling the terminals included in the group. For example, when receiving a control request from an external device connected to the GW device 10, the broadcast control unit 14 instructs the representative terminal included in the group to broadcast the first control signal.

  Further, the broadcast control unit 14 transmits a second control signal for controlling the terminal 100 to the terminals 100 not included in the group among the plurality of terminals 100. For example, when the broadcast control unit 14 receives a control request from an external device connected to the GW device 10, the broadcast control unit 14 transmits a second control signal to the terminals 100 not included in the group. The broadcast control unit 14 is an example of a control unit.

  Next, details of processing by the counting unit 12 and the group setting unit 13 will be described with reference to FIG. FIG. 4 is a diagram for explaining details of processing by the counting unit 12 and the group setting unit 13 in the first embodiment. 4, the terminal ID is an identifier of each terminal 100 shown in FIG. 1, and the terminal IDs “# 1” to “# 11” correspond to the terminals 100a to 100k shown in FIG. 1, respectively.

  As shown in FIG. 4A, the counting unit 12 combines the list of radio field strengths received from the radio field strength acquisition unit 11 to combine all the terminals 100 (that is, the terminals 100a to 100k) in the wireless communication network. A radio wave intensity matrix 50 for storing the radio wave intensity between them is created. In the radio wave intensity matrix 50, the data associated with the terminal ID of each terminal 100 represents the radio wave intensity (dBm) between each terminal 100 and another terminal. For example, “# 1 / -100” of the terminal ID “# 6” indicates that the radio wave intensity between the terminal 100f and the terminal 100a is −100 (dBm). For example, “# 2 / -30” of the terminal ID “# 6” indicates that the radio wave intensity between the terminal 100f and the terminal 100b is −30 (dBm).

  The counting unit 12 compares the created radio wave intensity matrix 50 with a threshold value, and for each terminal 100, extracts another terminal having a radio wave intensity equal to or higher than the threshold value as a strongly connected terminal, thereby determining the number of strongly connected terminals. Count. Note that an arbitrary value is used as the threshold value, but −46 (dBm) is used in FIG. In FIG. 4A, regarding the terminal 100f corresponding to the terminal ID “# 6”, the terminal 100b, the terminal 100c, the terminal 100e, the terminal 100g, and the terminal 100k are extracted as the strongly connected terminals. The number of terminals is “5”, the largest.

  As shown in FIG. 4B, the group setting unit 13 refers to the radio wave intensity matrix 50 and selects the representative terminal having the largest number of strongly connected terminals from all the terminals 100 in the wireless network. Then, the group G1 including the representative terminal and the strongly connected terminal is set. That is, as described above, the number of connected terminals is the largest for the terminal 100f corresponding to the terminal ID “# 6”. Therefore, the group setting unit 13 selects the terminal 100f as the representative terminal, and includes the group G1 including the terminal 100f and the terminals 100b, 100c, 100e, 100g, and 100k that are strongly connected terminals of the terminal 100f. Set. At this time, the group setting unit 13 reconfigures the radio wave intensity matrix 50 so that terminals included in the set group G1 are not selected as representative terminals again.

  As shown in FIG. 4C, the group setting unit 13 refers to the radio wave intensity matrix 50 and selects the representative terminal having the largest number of strongly connected terminals from the terminals 100 other than the terminals included in the group G1. A group G2 including the representative terminal and the strongly connected terminal is selected. That is, among the terminals 100a, 100d, 100h, 100i, and 100j other than the terminals included in the group G1, the number of strongly connected terminals of the terminal 100i is “2”, which is the largest. For this reason, the group setting unit 13 selects the terminal 100i as a representative terminal, and sets a group G2 including the terminal 100i and the terminals 100h and 100j that are strongly connected terminals of the terminal 100i. At this time, the group setting unit 13 reconfigures the radio wave intensity matrix 50 so that the terminals included in the set group G2 are not selected again as the representative terminals.

  In FIG. 4C, since the terminal 100a and the terminal 100d remain as the terminals 100 not included in the group, the group setting unit 13 stops generating the group.

  Next, a processing procedure of the GW apparatus 10 according to the present embodiment will be described. FIG. 5 is a flowchart illustrating the processing procedure of the GW apparatus 10 according to the first embodiment.

  As shown in FIG. 5, the GW apparatus 10 acquires the radio field intensity between each terminal 100 and another terminal (step S101). For each terminal 100, the GW apparatus 10 counts the number of strongly connected terminals that are other terminals whose radio wave intensity is equal to or greater than the threshold (step S102).

  The GW apparatus 10 selects a representative terminal from the plurality of terminals 100 in descending order of the number of strongly connected terminals, and sets a group including the representative terminal and the strongly connected terminals (step S103). The GW apparatus 10 instructs the representative terminal included in the group to broadcast the first control signal for controlling the terminals included in the group. On the other hand, the GW apparatus 10 transmits a second control signal for controlling the terminal 100 to the terminals 100 not included in the group among the plurality of terminals 100 (step S104).

  As described above, according to the present embodiment, in the GW apparatus 10 that wirelessly communicates with a plurality of terminals 100, the radio wave intensity acquisition unit 11 acquires the radio wave intensity between each terminal 100 and another terminal. For each terminal 100, the counting unit 12 counts the number of strongly connected terminals that are other terminals whose radio field intensity is equal to or greater than a threshold value. The group setting unit 13 selects a representative terminal from the plurality of terminals 100 in the descending order of the number of strongly connected terminals, and sets a group including the representative terminal and the strongly connected terminals. The broadcast control unit 14 instructs the representative terminal included in the group to perform broadcast transmission of the first control signal that controls all the terminals 100 included in the group.

  With the configuration of the GW device 10, it is possible to suppress the consumption of the wireless communication band as compared with a wireless multi-hop communication method in which a plurality of terminals mutually transfer control signals from the GW device. Network congestion can be avoided.

  In the GW apparatus 10, the broadcast control unit 14 further transmits a second control signal for controlling the terminal 100 to the terminals 100 not included in the group among the plurality of terminals 100.

  With the configuration of the GW apparatus 10, stable communication can be performed on a one-to-one basis with the terminal 100 having a relatively low radio field intensity, and the number of retransmissions of the second control signal can be reduced. Congestion of the wireless communication network can be avoided more reliably.

  The second embodiment is different from the first embodiment in that the threshold value of the radio wave intensity is changed and the number of strongly connected terminals is counted again using the changed threshold value.

  Since the configuration of the wireless communication network according to the second embodiment is the same as that of the first embodiment, the description thereof is omitted. FIG. 6 is a diagram illustrating a configuration example of the GW apparatus 20 according to the second embodiment. 6, the same parts as those in FIG. 3 are denoted by the same reference numerals, and the description thereof is omitted.

  As illustrated in FIG. 6, the GW apparatus 20 includes a counting unit 22 instead of the counting unit 12 illustrated in FIG. 3.

  The counting unit 22 basically has the same function as the counting unit 12 shown in FIG. That is, for each terminal 100, the counting unit 22 counts the number of strongly connected terminals that are other terminals whose radio wave intensity is equal to or greater than the “threshold value”. Further, the counting unit 22 measures the response time from when the first control signal is broadcast by the representative terminal included in the group until the response corresponding to the first control signal is received. The counting unit 22 changes the “threshold value” according to the measured response time, and counts the number of strongly connected terminals using the changed threshold value. For example, the counter 22 increases the “threshold” when the response time is longer than a predetermined time, and decreases the “threshold” when the response time is shorter than the predetermined time.

  As described above, according to the present embodiment, in the GW apparatus 20, the counting unit 22 receives a response corresponding to the first control signal after the first control signal is broadcast by the representative terminal included in the group. Measure the response time until Then, the counting unit 22 changes the “threshold value” according to the measured response time, and counts the number of strongly connected terminals using the changed threshold value.

  Since the number of strongly connected terminals counted according to the response time varies depending on the configuration of the GW apparatus 20, the number of groups set following the number of strongly connected terminals is dynamically adjusted. For this reason, interference between groups can be avoided, and as a result, congestion of the wireless communication network can be avoided more reliably.

  The third embodiment relates to an example in which the group described in the first and second embodiments is applied to “order control” for controlling a plurality of terminals in a predetermined order. Here, as an example, an example in which the group described in the first embodiment is applied to “order control” will be described.

  Since the configuration of the wireless communication network according to the third embodiment is the same as that of the first embodiment, the description thereof is omitted. FIG. 7 is a diagram illustrating a configuration example of the GW apparatus 30 according to the third embodiment. 7, the same parts as those in FIG. 3 are denoted by the same reference numerals, and the description thereof is omitted.

  As illustrated in FIG. 7, the GW apparatus 30 includes a sequence control unit 35.

  The order control unit 35 transmits a third control signal for controlling the plurality of terminals 100 in a “predetermined order”. Specifically, the order control unit 35 receives information indicating a group from the group setting unit 13 when transmitting the third control signal. The order control unit 35 transmits the third control signal in the same order as the “predetermined order” to two or more terminals included in the same group among the plurality of terminals 100. In addition, the order control unit 35 transmits the third control signal to two or more terminals not included in the same group at the same time.

  FIG. 8 is a diagram illustrating an aspect of wireless communication between the GW apparatus 30 and each terminal 100 according to the third embodiment. In FIG. 8, it is assumed that a group G1 including a terminal 100f that is a representative terminal and terminals 100b, 100c, 100e, 100g, and 100k that are strongly connected terminals of the terminal 100f is set. In FIG. 8, it is assumed that a group G2 including a terminal 100i that is a representative terminal and terminals 100h and 100j that are strongly connected terminals of the terminal 100i is set.

  In FIG. 8, the number in each terminal 100 represents a sequence number corresponding to the above “predetermined sequence”. Here, a case where the GW apparatus 30 transmits a third control signal for controlling the terminals 100a to 100h in a “predetermined order” in which the terminals 100a to 100h are numbered 1 to 11 respectively will be described.

  When transmitting the third control signal for controlling the plurality of terminals 100 in the “predetermined order”, the GW apparatus 30 includes two or more terminals 100 included in the same group among the plurality of terminals 100. The third control signal is transmitted in the same order as the “predetermined order”. For example, since the terminal 100e, the terminal 100f, and the terminal 100g are included in the group G1, the GW apparatus 30 performs the third control in the order in which the terminal 100e, the terminal 100f, and the terminal 100g are the fifth, sixth, and seventh, respectively. Send a signal. Further, for example, since the terminal 100h, the terminal 100i, and the terminal 100j are included in the group G2, the GW apparatus 30 performs the third operation in the order that the terminal 100h, the terminal 100i, and the terminal 100j are the eighth, the ninth, and the tenth, respectively. The control signal is transmitted.

  On the other hand, the GW apparatus 30 transmits a third control signal simultaneously to two or more terminals 100 that are not included in the same group. For example, since the terminal 100a and the terminal 100b are not included in the same group, the GW apparatus 30 transmits a third control signal to the terminal 100a and the terminal 100b at the same time. For example, since the terminal 100c and the terminal 100d are not included in the same group, the GW apparatus 30 transmits the third control signal to the terminal 100c and the terminal 100d at the same time. For example, since the terminal 100g and the terminal 100h are not included in the same group, the GW apparatus 30 transmits the third control signal to the terminal 100g and the terminal 100h at the same time. For example, since the terminal 100j and the terminal 100k are not included in the same group, the GW apparatus 30 transmits the third control signal to the terminal 100j and the terminal 100k at the same time.

  As described above, according to the present embodiment, in the GW apparatus 30, the order controller 35 transmits a plurality of terminals 100 when transmitting the third control signal for controlling the terminals 100 in a “predetermined order”. Among them, the third control signal is transmitted to two or more terminals included in the same group in the same order as the “predetermined order”. In addition, the order control unit 35 transmits the third control signal to two or more terminals not included in the same group at the same time.

  With the configuration of the GW apparatus 30, it is possible to efficiently execute “order control” for controlling a plurality of terminals in a predetermined order while avoiding interference between terminals included in the same group.

(Other examples)
Each component of each part illustrated in the embodiments does not necessarily need to be physically configured as illustrated. In other words, the specific form of distribution / integration of each part is not limited to the one shown in the figure, and all or a part thereof may be functionally or physically distributed / integrated in arbitrary units according to various loads and usage conditions. Can be configured.

  Furthermore, various processing functions performed in each device are performed on a CPU (Central Processing Unit) (or a microcomputer such as an MPU (Micro Processing Unit), MCU (Micro Controller Unit), etc.) in whole or in part. You may make it perform. Various processing functions may be executed entirely or arbitrarily on a program that is analyzed and executed by a CPU (or a microcomputer such as an MPU or MCU) or hardware based on wired logic. .

  The GW apparatus according to the first to third embodiments can be realized by the following hardware configuration, for example.

  FIG. 9 is a diagram illustrating a hardware configuration example of the GW apparatus. As illustrated in FIG. 9, the GW apparatus 500 includes an RF (Radio Frequency) circuit 501, a processor 502, a memory 503, and a network IF (Inter Face) circuit 504. Examples of the processor 502 include a central processing unit (CPU), a digital signal processor (DSP), and a field programmable gate array (FPGA). Examples of the memory 503 include a random access memory (RAM) such as an SDRAM (Synchronous Dynamic Random Access Memory), a read only memory (ROM), and a flash memory. Each GW apparatus according to the first to third embodiments has the configuration shown in FIG.

  Various processing functions performed by the GW apparatus according to the first to third embodiments may be realized by executing a program stored in various memories such as a nonvolatile storage medium using a processor included in the GW apparatus. That is, a program corresponding to each process executed by the radio wave intensity acquisition unit 11, the counting units 12 and 22, the group setting unit 13, the broadcast control unit 14, and the sequence control unit 35 is recorded in the memory 503. It may be executed at 502.

10, 20, 30 GW device 11 radio wave intensity acquisition unit 12 counting unit 12, 22 counting unit 13 group generation unit 14 broadcast control unit 35 sequence control unit 100 terminal

Claims (6)

A wireless communication control method in a wireless communication control device that wirelessly communicates with a plurality of terminals,
For each of the plurality of terminals, obtain the radio field strength between the terminal and another terminal,
For each of the plurality of terminals, count the number of strongly connected terminals that are the other terminals whose radio field intensity is equal to or greater than a threshold,
Selecting a representative terminal from the plurality of terminals in order of the number of the strongly connected terminals, and setting a group including the representative terminal and the strongly connected terminals;
A radio communication control method, comprising: instructing the representative terminal included in the group to broadcast a first control signal for controlling a terminal included in the group. The radio communication control method according to claim 1, further comprising: transmitting a second control signal for controlling the terminal to a terminal not included in the group among the plurality of terminals. Further comprising measuring a response time from when the representative terminal included in the group broadcasts the first control signal until the representative terminal receives a response to the first control signal;
The counting process is:
The wireless communication control method according to claim 1 or 2, wherein the threshold is changed according to the measured response time, and the number of the strongly connected terminals is counted again using the changed threshold. When transmitting a third control signal for controlling the plurality of terminals in a predetermined order, the predetermined order is the same for two or more terminals included in the same group among the plurality of terminals. And transmitting the third control signal to two or more terminals that are not included in the same group at the same time. The wireless communication control method according to any one of 1 to 3. A wireless communication control device that wirelessly communicates with a plurality of terminals,
For each of the plurality of terminals, an acquisition unit that acquires radio field intensity between the terminal and another terminal;
For each of the plurality of terminals, a counting unit that counts the number of strongly connected terminals that are the other terminals whose radio field intensity is greater than or equal to a threshold value;
A setting unit that sets a group including the representative terminal and the strongly connected terminal by selecting a representative terminal from the plurality of terminals in descending order of the number of the strongly connected terminals;
And a control unit that instructs the representative terminal included in the group to broadcast a first control signal for controlling a terminal included in the group. In a wireless communication control device that wirelessly communicates with a plurality of terminals,
For each of the plurality of terminals, obtain the radio field intensity between the terminal and another terminal,
For each of the plurality of terminals, count the number of strongly connected terminals that are the other terminals whose radio field intensity is equal to or greater than a threshold,
Selecting a representative terminal from the plurality of terminals in order of the number of the strongly connected terminals, and setting a group including the representative terminal and the strongly connected terminals;
A wireless communication control program for executing a process of instructing the representative terminal included in the group to perform broadcast transmission of a first control signal for controlling a terminal included in the group.

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