JP7652426B2 - Wireless access point, wireless communication system, and wireless communication method - Google Patents

Description

The present invention primarily relates to a wireless access point to which multiple wireless communication terminals are connected.

Patent document 1 discloses a system in which multiple STAs (stations) communicate with an AP (access point). The system in patent document 1 uses TWT (Target Wake Time). TWT is a function that reduces power consumption by shortening the period during which the STA is active. Specifically, the STA transmits a TWT request to the AP or another STA. The TWT request includes the time for the STA to wake up and start wireless communication. The AP groups the STAs based on the TWT request.

JP 2018-170772 A

In an environment in which multiple wireless communication terminals are connected to a wireless access point for communication, as in Patent Document 1, for example, when the wireless communication terminals transmit packets simultaneously, a packet collision may occur. When a packet collision occurs, the packet must be retransmitted, which may cause a delay in data transmission. Patent Document 1 describes the use of TWT to reduce power consumption, but does not describe the use of TWT for other purposes.

The present invention has been made in consideration of the above circumstances, and its main objective is to provide a wireless access point that prevents packet collisions and reduces delays in data transmission.

Means for solving the problems and effects

The problem that the present invention aims to solve is as described above. Next, we will explain the means for solving this problem and its effects.

According to a first aspect of the present invention, there is provided a wireless access point having the following configuration. That is, the wireless access point includes a communication unit and a control unit. The communication unit transmits and receives data to and from a plurality of connected wireless communication terminals. The control unit determines a transmission period during which the wireless communication terminal can transmit data for each wireless communication terminal, and sets a target wake time (TWT) so that the wireless communication terminal is active during the determined transmission period. The communication unit divides one channel into a plurality of subcarriers, thereby enabling simultaneous transmission and reception of data between the plurality of wireless communication terminals. The control unit assigns the subcarriers to each of the wireless communication terminals for each transmission period. The control unit sets the TWT so that the wireless communication terminal to which the subcarriers are assigned is active during the transmission period.

This adjusts the start-up timing of multiple wireless communication terminals, making it difficult for packets transmitted by multiple wireless communication terminals to collide with each other. As a result, data transmission delays are unlikely to occur. In particular, in this configuration, unlike general TWT, the wireless access point determines the transmission period for each wireless communication terminal. Therefore, the wireless access point can determine an appropriate transmission period taking into account the transmission periods of other wireless communication terminals. Furthermore, even if it is not possible to appropriately secure the transmission periods of all wireless communication terminals by simply dividing one channel into multiple subcarriers, the transmission periods of the wireless communication terminals can be appropriately secured by using TWT in combination.

In the wireless access point, it is preferable that the control unit updates the TWT settings when the number of wireless communication terminals connected to the communication unit increases or decreases.

This allows the transmission period of the wireless communication terminal to be adjusted depending on the number of connections of the wireless communication terminal, etc.

In the wireless access point, it is preferable that the control unit updates the allocation of the subcarriers to the wireless communication terminals for each transmission period when the number of the wireless communication terminals connected to the communication unit increases or decreases.

This allows the transmission period of the wireless communication terminal to be adjusted depending on the number of connections of the wireless communication terminal, etc.

In the wireless access point, it is preferable that the control unit allocates the subcarriers and sets the TWT so that the lengths of the transmission periods of all the wireless communication terminals currently connected are uniform.

This allows the transmission periods of wireless communication terminals to be uniform. As a result, for example, delays are less likely to occur in communications between all wireless communication terminals.

In the wireless access point, it is preferable that the control unit allocates the subcarriers and sets the TWT so that the length of the transmission period differs depending on the currently connected wireless communication terminal, based on auxiliary information for determining the transmission period of the wireless communication terminal.

This allows communication conditions to be tailored to the user's needs, for example by lengthening the transmission period for wireless communication terminals where delays are undesirable or for wireless communication terminals with high communication volumes.

According to a second aspect of the present invention, there is provided a wireless communication system comprising the wireless access point described above and a wireless communication terminal.

According to a third aspect of the present invention, there is provided a wireless communication setting method as follows. In this wireless communication setting method, wireless communication is set up between a wireless access point and a plurality of wireless communication terminals. The wireless access point is capable of simultaneously transmitting and receiving data to and from the plurality of wireless communication terminals by dividing one channel into a plurality of subcarriers. The wireless access point determines a transmission period during which the wireless communication terminal is capable of transmitting data for each wireless communication terminal. The wireless access point assigns the subcarriers to each of the wireless communication terminals for each transmission period. The wireless access point sets a target wake time (TWT) such that the wireless communication terminal to which the subcarriers are assigned is active during the transmission period.

1 is a diagram showing a wireless communication system including a wireless access point according to an embodiment of the present invention; FIG. 4 is a sequence diagram showing a process performed when a wireless communication terminal is connected to a wireless access point. 11 is a time chart showing subcarrier allocation and TWT settings when the length of the transmission period of each wireless communication terminal is made uniform. 11 is a time chart showing subcarrier allocation and TWT setting when the length of the transmission period is made different depending on the wireless communication terminal.

Next, an embodiment of the present invention will be described with reference to the drawings. First, a wireless communication system 100 including a wireless access point 1 will be described with reference to FIG. 1.

As shown in FIG. 1, the wireless communication system 100 is composed of a wireless access point 1, a communication device 2, and a wireless communication terminal 3. Note that the wireless access point 1, the communication device 2, and the wireless communication terminal 3 constituting the wireless communication system 100 may each be one or more.

The wireless access point 1 is connected to the communication device 2 via a wired LAN and is capable of wired communication with the communication device 2. The communication device 2 is a personal computer, a NAS, a server, etc. The wireless access point 1 is a wireless LAN router or a wireless LAN bridge, and constructs a wireless LAN network with itself as the center.

The wireless access point 1 is capable of wireless communication with the wireless communication terminal 3 in compliance with a specific wireless communication standard. An example of the wireless communication standard is IEEE 802.11, but is not limited to this. The wireless communication terminal 3 is, for example, a smartphone, a tablet terminal, or a personal computer. Alternatively, the wireless communication terminal 3 may be a wireless device for connecting the industrial machine 4 to a wireless LAN network.

The wireless communication terminal 3 is equipped with an antenna or a wireless communication module, and can perform wireless communication with, for example, the wireless access point 1. The wireless access point 1 relays communication between multiple wireless communication terminals 3 or between the communication device 2 and the wireless communication terminal 3. The wireless access point 1 may also be capable of performing processing to connect the wireless communication terminal 3 to another network (for example, a WAN such as the Internet), etc.

The wireless access point 1 includes a communication unit 11 and a control unit 12.

The communication unit 11 performs wired communication and wireless communication. Specifically, the communication unit 11 has an interface for performing wired communication, and an antenna and wireless communication module for performing wireless communication.

The control unit 12 includes a calculation device such as a CPU, a ROM such as a flash memory, a hard disk, or an SSD, and a RAM. The control unit 12 performs various controls related to the wireless access point 1 by reading out programs stored in the ROM into the RAM and executing them.

The wireless access point 1 and wireless communication terminal 3 of this embodiment are compatible with the TWT (Target Wake Time) function adopted in the IEEE 802.11 communication standard (e.g., IEEE 802.11ax, etc.) and the OFDMA (Orthogonal Frequency Division Multiple Access) communication technology. Below, we will briefly explain OFDMA and TWT.

TWT (Target Wake Time) is a function that reduces power consumption by shortening the period during which the wireless communication terminal 3 is active. In the following explanation, a state in which the wireless communication terminal 3 is performing wireless communication or can immediately perform wireless communication is referred to as "active", and a state in which the wireless communication terminal 3 is in sleep mode with only the minimum functions enabled and cannot immediately perform wireless communication is referred to as "standby". Generally, in TWT, the period during which the wireless communication terminal 3 is active is specified in advance and transmitted to the wireless access point 1. The wireless communication terminal 3 remains in standby mode except for the period specified in advance. This shortens the period during which the wireless communication terminal 3 is active, thereby reducing power consumption.

OFDMA is a function that divides the bandwidth of one channel (e.g., 20 MHz) into multiple subcarriers and assigns each subcarrier to a wireless communication terminal 3 to perform communication. For example, the wireless access point 1 divides one channel into 234 subcarriers and further divides the 234 subcarriers into a predetermined number of groups. The wireless access point 1 creates nine groups, for example, with 26 subcarriers in one group. However, there are various ways to divide the groups, and they can be changed as appropriate according to the required specifications, etc. For example, the number of subcarriers included in one group may be different from the number of subcarriers included in the other groups. Specifically, three groups may be created with 26 subcarriers in one group, and three groups may be created with 52 subcarriers in one group. In the following description, a group that includes multiple subcarriers is simply called a "subcarrier group."

The wireless access point 1 assigns a subcarrier group to each wireless communication terminal 3. The wireless communication terminal 3 performs wireless communication using the assigned subcarrier group. This allows multiple wireless communication terminals 3 to perform wireless communication simultaneously.

However, if the number of wireless communication terminals 3 connected to the wireless access point 1 exceeds the number of subcarrier groups, it is not possible to assign different subcarrier groups to all of the wireless communication terminals 3. For example, if the number of subcarrier groups is five and six wireless communication terminals 3 are connected to the wireless access point 1, it is not possible to assign a subcarrier group to one wireless communication terminal 3. As a result, problems such as a significant reduction in the opportunities for data transmission for a particular wireless communication terminal 3 may occur. Note that if the same subcarrier group is assigned to two or more wireless communication terminals 3, packets transmitted by the wireless communication terminals 3 may collide with each other, causing delays.

As described above, the original purpose of TWT is to reduce power consumption by shortening the period during which the wireless communication terminal 3 is activated. In this embodiment, the use of TWT makes it possible to easily set the activation period of the wireless communication terminal 3, and this is utilized to prevent packet collisions while ensuring opportunities for data transmission from the wireless communication terminal 3. The specific processing flow will be described below with reference to Figures 2 and 3.

Figure 2 shows the process flow when the wireless access point 1 is started first, and then the two wireless communication terminals 3 are started in sequence. In the following, the wireless communication terminal 3 that is started first is defined as the first wireless communication terminal 3a, and the wireless communication terminal 3 that is started next is defined as the second wireless communication terminal 3b.

As shown in FIG. 2, first, the wireless access point 1 starts up (sequence number S1). After that, the first wireless communication terminal 3a starts up (sequence number S2). The first wireless communication terminal 3a performs a connection process to the wireless access point 1 (sequence number S3).

In response to the connection of the first wireless communication terminal 3a, the wireless access point 1 assigns subcarriers (sequence number S4). Assigning subcarriers means assigning the above-mentioned subcarrier groups to the first wireless communication terminal 3a. At this point in time, since only the first wireless communication terminal 3a is connected to the wireless access point 1, all subcarrier groups may be assigned to the first wireless communication terminal 3a.

Furthermore, when multiple wireless communication terminals 3 are connected to the wireless access point 1, the wireless access point 1 allocates subcarriers as follows. Figure 3 shows an example of allocation when there are six wireless communication terminals 3 connected to the wireless access point 1 and five subcarrier groups (A to E). In this example, since the number of wireless communication terminals 3 is greater than the number of subcarrier groups, it is not possible to always allocate subcarrier groups to all wireless communication terminals 3. Therefore, the wireless access point 1 changes the allocation status of subcarrier groups according to the time as follows:

During the transmission period from time T0 to time T1, subcarrier groups are assigned to the first to fifth wireless communication terminals 3, and no subcarrier group is assigned to the sixth wireless communication terminal 3. During the transmission period from time T1 to time T2, subcarrier groups are assigned to the first to fourth and sixth wireless communication terminals 3, and no subcarrier group is assigned to the fifth wireless communication terminal 3. In this manner, in this embodiment, the wireless communication terminals 3 to which a subcarrier group is not assigned change sequentially depending on the transmission period. That is, in the example shown in FIG. 3, each wireless communication terminal 3 is assigned a subcarrier group for 5/6 of the period from time T0 to T6, and is not assigned a subcarrier group for 1/6 of the period. In other words, the length of the period during which a subcarrier group is assigned to all wireless communication terminals 3 is uniform.

Returning to FIG. 2, after the wireless access point 1 assigns the subcarrier group, it determines the transmission period of the first wireless communication terminal 3a and sets the TWT (sequence number S5). In this embodiment, the transmission period is determined so that the period to which the subcarrier group is assigned corresponds to the period during which the wireless communication terminal 3 can transmit data (transmission period). At this point in time, the first wireless communication terminal 3a is always in a state in which it can transmit data. Therefore, the wireless access point 1 sets the TWT so that the first wireless communication terminal 3a is active during all transmission periods.

In addition, when multiple wireless communication terminals 3 are connected to the wireless access point 1, the wireless access point 1 sets the TWT as follows. In the example of FIG. 3 described above, a subcarrier group is assigned to each wireless communication terminal 3 during 5/6 of the period from time T0 to T6. The wireless access point 1 determines the transmission period of each wireless communication terminal 3 so that it matches the period to which the subcarrier group is assigned. Then, the wireless access point 1 sets the TWT for each wireless communication terminal 3 so that the period to which the subcarrier group is assigned is active, and the period to which the subcarrier group is not assigned is standby. Specifically, in the example of FIG. 3, the wireless access point 1 assigns one of the subcarrier groups A to E to the first wireless communication terminal 3 during the period from time T0 to T5. In response to this, the first wireless communication terminal 3 is active during this period. In addition, the wireless access point 1 does not assign a subcarrier group to the first wireless communication terminal 3 during the period from time T5 to T6. In response to this, the first wireless communication terminal 3 is standby during this period. In this way, the wireless access point 1 can control the wireless communication terminal 3 to be active or in standby depending on whether or not a subcarrier group is assigned, by setting the TWT. Also, in the example of FIG. 3, the length of the period during which a subcarrier group is assigned is uniform for all wireless communication terminals 3. Therefore, the length of the period during which transmission is possible is also uniform for all wireless communication terminals 3.

For example, in the transmission period from time T0 to time T1 in FIG. 3, the sixth wireless communication terminal 3 is not assigned a subcarrier group. Therefore, in the transmission period from time T0 to time T1, the TWT is set so that the sixth wireless communication terminal 3 is on standby. The same applies to the other transmission periods. In this way, by using OFDMA and TWT together, packet collisions can be prevented while ensuring opportunities for wireless communication terminal 3 to transmit data.

Returning to FIG. 2, after setting the TWT, the wireless access point 1 notifies the first wireless communication terminal 3a of the subcarrier and TWT settings (sequence number S6). Upon receiving this notification, the first wireless communication terminal 3a sets the subcarrier and TWT (sequence number S7). As described above, since the first wireless communication terminal 3a supports OFDMA and TWT, the settings on the first wireless communication terminal 3a side are completed simply by being notified of the contents according to the standards from the wireless access point 1. Therefore, there is no need to specially customize the wireless communication terminal 3 to realize the wireless communication system 100 of this embodiment.

Then, the second wireless communication terminal 3b is started up (sequence number S8). The second wireless communication terminal 3b performs a connection process to the wireless access point 1 (sequence number S9).

In response to the connection of the second wireless communication terminal 3b, the wireless access point 1 updates the subcarrier allocation (sequence number S10). For example, the wireless access point 1 allocates subcarrier groups evenly to the first wireless communication terminal 3a and the second wireless communication terminal 3b. For example, if there are six subcarrier groups, three subcarrier groups are allocated to each of the first wireless communication terminal 3a and the second wireless communication terminal 3b. Note that, as will be described in detail later, subcarrier groups may be allocated to the first wireless communication terminal 3a and the second wireless communication terminal 3b so that the number of subcarrier groups is different.

Next, after allocating the subcarrier group, the wireless access point 1 determines the transmission period of the second wireless communication terminal 3b and updates the TWT setting (sequence number S11). The method of determining the transmission period of the second wireless communication terminal 3b is the same as that of sequence number S5. For example, when a subcarrier group is allocated to the second wireless communication terminal 3b for the entire period, the entire period is a transmission period, and the TWT setting is performed so that the second wireless communication terminal 3b is active for the entire period. Note that when a subcarrier group is allocated to the second wireless communication terminal 3b only for a specific period, the TWT setting is performed so that the second wireless communication terminal 3b is active for the specific period.

Then, the wireless access point 1 notifies the first wireless communication terminal 3a and the second wireless communication terminal 3b of the updated subcarrier and TWT settings (sequence number S12). Upon receiving this notification, the first wireless communication terminal 3a and the second wireless communication terminal 3b set the updated subcarrier and TWT (sequence numbers S13 and S14).

By repeating the above-mentioned process according to an increase or decrease in the number of wireless communication terminals 3 connected to the wireless access point 1, it is possible to appropriately allocate subcarriers, determine the transmission period, and set the TWT according to the current connection status.

In the example shown in FIG. 3, the length of the transmission period is uniform for all wireless communication terminals 3. This is just one example, and the length of the transmission period may differ depending on the wireless communication terminal 3. For example, in a situation where the wireless communication terminal 3 to be connected to the wireless access point 1 is predetermined, the priority of communication for a specific wireless communication terminal 3 may be high. In this case, the wireless access point 1 may be set so that this specific wireless communication terminal 3 can always transmit data. A specific explanation is given below with reference to FIG. 4.

The control unit 12 of the wireless access point 1 prestores auxiliary information for determining the transmission period of the wireless communication terminal 3 for the wireless communication terminal 3 that is a connection candidate. However, the control unit 12 may obtain this auxiliary information from outside (e.g., the communication device 2). The example shown in FIG. 4 shows a second allocation example in which there are six wireless communication terminals 3 connected to the wireless access point 1 and there are five subcarrier groups (A to E). The priority of communication for each wireless communication terminal 3 corresponds to the auxiliary information. As shown in FIG. 4, the priority of communication for the first wireless communication terminal 3 is high, the priority of communication for the fourth wireless communication terminal 3 is low, and the priority of communication for the other wireless communication terminals 3 is medium.

The wireless access point 1 allocates subcarriers and sets the TWT based on the auxiliary information. In FIG. 4, the differences from the example shown in FIG. 3 are outlined in bold. Specifically, in the period from time T5 to time T6, subcarriers are allocated to the first wireless communication terminal 3 instead of the fourth wireless communication terminal 3. This makes it possible to increase the length of the transmission period of the first wireless communication terminal 3 while reducing the length of the transmission period of the fourth wireless communication terminal 3.

The TWT is set according to this subcarrier allocation. Specifically, for the first wireless communication terminal 3, the TWT is set so that the entire period is a transmission period. For the fourth wireless communication terminal 3, the TWT is set so that the terminal is in standby mode twice in one period.

In the example shown in FIG. 4, the transmission period of a wireless communication terminal 3 with a high communication priority can be lengthened, while the transmission period of a wireless communication terminal 3 with a low communication priority can be shortened. In other words, an appropriate transmission period can be set according to the characteristics of the wireless communication terminal 3. Note that the auxiliary information is not limited to the communication priority, and may be, for example, the amount of data to be communicated.

As described above, the wireless access point 1 of this embodiment includes a communication unit 11 and a control unit 12, and performs the following wireless communication setting method. The communication unit 11 transmits and receives data to multiple wireless communication terminals 3 that are currently connected. The control unit 12 determines a transmission period during which the wireless communication terminal 3 can transmit data for each wireless communication terminal 3, and sets the TWT so that the wireless communication terminal 3 is active during the determined transmission period.

This allows the start-up timing of multiple wireless communication terminals 3 to be adjusted, making it less likely that packets transmitted by multiple wireless communication terminals 3 will collide with each other. As a result, delays in data transmission are less likely to occur. In particular, in this configuration, unlike typical TWT, the wireless access point 1 determines the transmission period for each wireless communication terminal 3. Therefore, the wireless access point 1 can determine an appropriate transmission period that takes into account the transmission periods of the other wireless communication terminals 3.

In the wireless access point 1 of this embodiment, the control unit 12 updates the TWT settings when the number of wireless communication terminals 3 connected to the communication unit 11 increases or decreases.

This allows the transmission period of the wireless communication terminal 3 to be adjusted according to the number of connections of the wireless communication terminal 3, etc.

In the wireless access point 1 of this embodiment, the communication unit 11 divides one channel into multiple subcarriers, making it possible to simultaneously transmit and receive data to and from multiple wireless communication terminals 3. The control unit 12 assigns subcarriers to each wireless communication terminal 3 for each transmission period. The control unit 12 sets the TWT so that the wireless communication terminal 3 to which the subcarrier is assigned is active during the transmission period.

Even if dividing one channel into multiple subcarriers alone does not ensure an adequate transmission period for all wireless communication terminals 3, the combined use of TWT can ensure an adequate transmission period for wireless communication terminals 3.

In the wireless access point 1 of this embodiment, when the number of wireless communication terminals 3 connected to the communication unit 11 increases or decreases, the control unit 12 updates the allocation of subcarriers to the wireless communication terminals 3 for each transmission period.

This allows the transmission period of the wireless communication terminal 3 to be adjusted according to the number of connections of the wireless communication terminal 3, etc.

In the wireless access point 1 of this embodiment, the control unit 12 assigns subcarriers and sets the TWT so that the transmission periods of all connected wireless communication terminals 3 are uniform in length.

This allows the transmission periods of the wireless communication terminals 3 to be uniform. As a result, for example, delays are less likely to occur in communications between all wireless communication terminals.

In the wireless access point 1 of this embodiment, the control unit 12 assigns subcarriers and sets the TWT so that the length of the transmission period differs depending on the connected wireless communication terminal 3, based on auxiliary information for determining the transmission period of the wireless communication terminal 3.

This allows communication conditions to be tailored to the user's needs, for example by lengthening the transmission period for wireless communication terminals where delays are undesirable or for wireless communication terminals with high communication volumes.

The above describes a preferred embodiment of the present invention, but the above configuration can be modified, for example, as follows:

The wireless access point 1 and the wireless communication terminal 3 do not need to communicate using OFDMA. In this case, the wireless access point 1 associates one wireless communication terminal 3 with each transmission period. Then, the wireless access point 1 sets the TWT so that only the corresponding wireless communication terminal 3 is active during each transmission period. This makes it possible to achieve the same effects as the above embodiment.

Whether or not to make the length of the transmission period for each wireless communication terminal 3 uniform may be used depending on the settings. For example, if the auxiliary information shown in FIG. 4 is registered, an individual transmission period for each wireless communication terminal 3 may be determined based on the auxiliary information, and if the auxiliary information is not registered, the length of the transmission period for each wireless communication terminal 3 may be made uniform.

For example, in the allocation of subcarriers to the wireless communication terminals shown in FIG. 4, if the wireless access point 1 (specifically the wireless communication module) can assign a fixed subcarrier group to each specific wireless communication terminal 3 (for example, the first wireless communication terminal 3 is fixed to subcarrier group A), each specific wireless communication terminal 3 can occupy a specific subcarrier group and communicate. In this case, the wireless access point 1 shown in FIG. 2 can be prevented from updating the TWT settings more than necessary, and this can also prevent unnecessary notification processing of the TWT settings for the wireless communication terminal 3.

The sequence diagram of FIG. 2 shown in the above embodiment is an example, and some processes may be omitted, some processes may be changed, or new processes may be added. For example, the subcarrier notification and the TWT setting notification may be sent separately.

Reference Signs List 1 Wireless access point 2 Communication device 3 Wireless communication terminal 4 Industrial machine 11 Communication unit 12 Control unit 100 Wireless communication system

Claims (7)

a communication unit for transmitting and receiving data to and from a plurality of currently connected wireless communication terminals;
a control unit that determines a transmission period during which the wireless communication terminal is capable of transmitting data for each wireless communication terminal, and sets a target wake time (TWT) so that the wireless communication terminal is active during the determined transmission period;
Equipped with
the communication unit is capable of simultaneously transmitting and receiving data to and from a plurality of the wireless communication terminals by dividing one channel into a plurality of subcarriers;
the control unit assigns the subcarriers to each of the wireless communication terminals for each transmission period;
The wireless access point, wherein the control unit sets the TWT so that the wireless communication terminal to which the subcarrier is assigned is activated during the transmission period. 2. The wireless access point of claim 1,
The wireless access point is characterized in that the control unit updates the settings of the TWT when the number of the wireless communication terminals connected to the communication unit increases or decreases. 3. A wireless access point according to claim 1,
The wireless access point is characterized in that the control unit updates the allocation of subcarriers to the wireless communication terminals for each transmission period when the number of the wireless communication terminals connected to the communication unit increases or decreases. A wireless access point according to any one of claims 1 to 3,
A wireless access point, characterized in that the control unit allocates the subcarriers and sets the TWT so that the lengths of the transmission periods of all of the wireless communication terminals currently connected are uniform. A wireless access point according to any one of claims 1 to 4,
The control unit allocates the subcarriers and sets the TWT so that the length of the transmission period differs depending on the connected wireless communication terminal, based on auxiliary information for determining the transmission period of the wireless communication terminal. A wireless access point according to any one of claims 1 to 5 ;
The wireless communication terminal;
A wireless communication system comprising: 1. A wireless communication setting method for setting wireless communication between a wireless access point and a plurality of wireless communication terminals, comprising:
the wireless access point is capable of simultaneously transmitting and receiving data to and from a plurality of the wireless communication terminals by dividing one channel into a plurality of subcarriers;
The wireless access point,
determining a transmission period during which the wireless communication terminal is capable of transmitting data for each of the wireless communication terminals;
assigning the subcarriers to each of the wireless communication terminals for each transmission period;
A wireless communication setting method, comprising the steps of: setting a TWT (Target Wake Time) so that the wireless communication terminal to which the subcarrier is assigned is active during the transmission period.

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