First communication device, communication method, and integrated circuit

Abstract

To suppress interference, caused by inter-terminal communication, to an access point.SOLUTION: An access point comprises a circuit, which generates a signal including information relating to a second target reception signal strength, at the access point, of a second signal transmitted from a first terminal to a second terminal in a second link and information relating to transmission power of the access point, and a transmission circuit which transmits the signal. Parameters relating to the second target reception signal strength, the transmission power and a first link to the access point are used for transmission power control of the second link by the first terminal.SELECTED DRAWING: Figure 12

Description

Technical Field

[0001] The present disclosure relates to a terminal and a communication method.

Background Art

[0002] As a successor standard to IEEE 802.11ax (hereinafter referred to as "11ax"), which is a standard of the Institute of Electrical and Electronics Engineers (IEEE) 802.11, the technical specification of IEEE 802.11be (hereinafter referred to as "11be") is being developed.

[0003] For example, in 11be, a method (e.g., Triggered P2P) by which an access point (also referred to as a "base station", hereinafter referred to as "AP (Access Point)") triggers communication between terminals (hereinafter referred to as "STA (Station)") (e.g., communication between terminals, peer to peer (P2P) or Direct Link (DiL)) is being studied (see, for example, Non-Patent Documents 1 to 5).

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Non-Patent Document 2

Non-Patent Document 3

Non-Patent Document 4

Non-Patent Document 5

Non-Patent Document 6

Non-Patent Document 7

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, a method for suppressing interference to an access point due to communication between terminals has not been sufficiently studied.

[0006] Non-limiting embodiments of the present disclosure contribute to providing a terminal and a communication method for suppressing interference to an access point due to communication between terminals.

Means for Solving the Problems

[0007] A terminal according to an embodiment of the present disclosure includes a control circuit that performs transmission power control of a second link to another terminal based on parameters related to a first link to an access point, and a transmission circuit that transmits a signal on the second link in accordance with the transmission power control.

[0008] These general or specific aspects may be implemented in a system, apparatus, method, integrated circuit, computer program, or recording medium, or may be implemented in any combination of a system, apparatus, method, integrated circuit, computer program, and recording medium.

Advantages of the Invention

[0009] According to an embodiment of the present disclosure, interference to an access point due to communication between terminals can be suppressed.

[0010] Further advantages and effects in one embodiment of the present disclosure will be apparent from the specification and the drawings. Such advantages and / or effects are respectively provided by several embodiments and the features described in the specification and the drawings, but not all of them are necessarily provided to obtain one or more identical features.

Brief Description of the Drawings

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Embodiments for Carrying Out the Invention

[0012] Hereinafter, each embodiment of the present disclosure will be described in detail with reference to the drawings.

[0013] [11ax Transmission Procedure] For example, 11ax supports multi-user (MU) transmission in the uplink (UL: Uplink). Examples of UL MU transmission include MU-Multiple Input Multiple Output (MU-MIMO) and Orthogonal Frequency Division Multiple Access (OFDMA). In the UL MU transmission procedure in 11ax, for example, the AP may transmit a signal (e.g., also called a "Trigger frame") that is a trigger for the uplink signal to a plurality of STAs to be accommodated. The terminal may transmit an uplink signal (e.g., also called an uplink response signal) to the AP based on, for example, the Trigger frame. Note that the uplink response signal is also called, for example, a Trigger based Physical layer convergence procedure Protocol Data Unit (TB PPDU).

[0014] When transmitting an uplink response signal, for example, uplink transmission power control may be applied at the STA. The uplink transmission power control may be calculated according to the following formulas (1) and (2) using, for example, the set value of the "AP TX Power" field related to the transmission power of the AP in the downlink (DL: Downlink) included in the Common Info field within the Trigger frame shown in FIG. 1, and the set value of the "UL Target RSSI" field related to the target received signal strength of the AP in the uplink (for example, target Received Signal Strength Indicator (RSSI)) included in the User Info field within the Trigger frame shown in FIG. 2 (for example, refer to Non-Patent Document 6).

[0015] Note that the target received signal strength (target RSSI) may also be called the target received power. Also, the Common Info field may include, for example, information common to a plurality of STAs (for example, also called "common information" or "STA common information"). Further, the User Info field may include, for example, individual information for each STA (for example, called "user information", "STA individual information", or "user individual information").

Number

Number

[0016] In formulas (1) and (2), PL DL represents the path loss ([dBm]) in the downlink, and Tx pwr AP represents the set value of the AP TX Power field (for example, the transmission power value) ([dBm]), and DL RSSI represents the received strength (for example, RSSI) (dBm) of the downlink signal estimated (or measured) at the STA, and Target RSSIrepresents the set value ([dBm]) of the UL Target RSSI field.

[0017] FIG. 3 is a diagram showing an example of the format of a Medium Access Control (MAC) frame in 11ax (see, for example, Non-Patent Documents 6 and 7). The MAC frame may include, for example, a "Frame Control" field, a "Quality of Service (QoS) Control" field, and a "High Throughput (HT) Control" field.

[0018] FIG. 4 is a diagram showing an example of the Frame Control field within the MAC frame. Further, FIG. 5 is a diagram showing an example of the set values (e.g., Type value and Subtype value) of the Frame Control field.

[0019] In FIG. 5, for example, when the value (Type value) of the Type field of the Frame Control field is "Data" (e.g., the field value is "10") and the bit #7 (B7) of the value (Subtype value) of the SubType field is "1" (the range surrounded by the dotted line in FIG. 5), the size of the QoS Control field within the MAC frame is 2 bytes. On the other hand, for types different from the combination where the value of the Type field is "Data" and the bit #7 (B7) of the value of the Subtype field is "1", the size of the QoS Control field is 0 bytes.

[0020] FIG. 6 is a diagram showing an example of parameters indicated by each bit (e.g., Bits 0-15) of the QoS Control field within the MAC frame. As shown in FIG. 6, the QoS Control field may include parameters such as "Traffic Identify (TID)" representing the type of traffic held or "Queue Size" indicating the amount of traffic held (e.g., queue size).

[0021] Also, in the HT Control field within the MAC frame, for example, as shown in FIG. 3, one or more Control subfields may be included. Further, the Control subfield may include, for example, a Control ID for identifying the type of control information. FIG. 7 is a diagram showing an example of the set value of the Control ID. As shown in FIG. 7, the STA can distinguish the type of control information by the Control ID.

[0022] [Triggered P2P] In Triggered P2P, similar to UL MU transmission in 11ax, the AP may transmit a control signal (e.g., Trigger frame), which is a trigger for the P2P signal, to a terminal that starts transmission by P2P (e.g., called "Direct Link Scheduled (DLS) STA"). The Trigger frame may include, for example, information regarding the resources used for P2P link transmission. The terminal may transmit data to the STA (e.g., called "Direct Link Peer (DLP) STA") in the P2P link (or called Direct Link) after receiving the Trigger frame, for example.

[0023] Also, in Triggered P2P, for example, a method of dividing the uplink resource (e.g., called uplink resource) indicated by the Trigger frame and the P2P resource (e.g., called P2P resource) in the time domain (called time resource sharing), and a method of dividing the uplink resource and the P2P resource in the frequency domain (called frequency resource sharing) are being considered.

[0024] However, the method of transmission power control for Triggered P2P has not been fully considered.

[0025] Therefore, in one embodiment of the present disclosure, a method for appropriately controlling the transmission power of a Triggered P2P signal will be described, for example.

[0026] For example, for transmission control of a P2P link (e.g., transmission power control), there is a method in which control regarding interference with an AP is not performed based on information of the P2P link. In the transmission control of the P2P link based on this method, interference may occur when the P2P resource and the uplink resource are frequency multiplexed. For example, in the reception of an AP, when a large power difference (e.g., a power difference equal to or greater than a threshold value) occurs between the reception power of the uplink signal and the reception power of the P2P link signal, interference (e.g., also called adjacent channel interference or Inter-RU Interference between adjacent frequency bands) may occur.

[0027] FIG. 8 shows a configuration example of a wireless communication system. Further, FIG. 9 shows an example of the reception power at an AP in the wireless communication system shown in FIG. 8.

[0028] In FIG. 8, for example, the AP may trigger the uplink transmission (e.g., communication between STA1 and the AP) to STA1 by a Trigger frame (e.g., represented as TF). Also, in FIG. 8, for example, the AP may trigger the P2P link transmission (e.g., communication between STA2 and STA3) to STA2 by a Trigger frame.

[0029] As shown in FIG. 8, when both the uplink transmission and the P2P link transmission triggered by the Trigger frame are performed, the transmission of the P2P link by STA2 may interfere with the AP. For example, as shown in FIG. 9, in the AP, when the received power of the signal from the P2P link (for example, STA2-STA3 communication) is greater than the received power of the signal from the uplink (for example, STA1-AP communication), due to the influence of interference (for example, Adjacent channel interference), the reception performance of the uplink signal may deteriorate.

[0030] FIG. 10 is a sequence diagram showing an example of uplink transmission and P2P link transmission.

[0031] As shown in FIG. 10, for example, when the AP acquires a time resource (for example, transmission opportunity (TXOP)), it may transmit a Trigger frame.

[0032] Also, the STA that has received the Trigger frame (for example, STA#1 and STA#2 in FIG. 10) may transmit a signal (for example, TB-PPDU) of the uplink (for example, STA#1-AP) or a signal (for example, P2P-PPDU) of the P2P link (for example, STA2-STA3) after a specified time (for example, Short Inter Frame Space (SIFS)) has elapsed since the transmission and reception of the Trigger frame. Note that the P2P-PPDU may be any of, for example, single user (SU)-PPDU, multi user (MU)-PPDU, or trigger based (TB)-PPDU.

[0033] In FIG. 10, STA#3 (e.g., DLP STA) or the AP may transmit a response signal (e.g., ACK) after the expiration of the SIFS from the reception of, for example, a PPDU. For example, as shown in FIG. 10, the transmission process of the P2P link indicated by the Trigger frame may be performed within the TXOP acquired by the AP. Note that in FIG. 10, STA2 and STA3 may be in the same BSS (Basic Service Set) or different BSSs.

[0034] In one embodiment of the present disclosure, for example, when the uplink transmission and the P2P link transmission indicated by the Trigger frame are frequency multiplexed, a method for appropriately controlling the transmission power control of the P2P link to reduce the interference that the transmission of the P2P link causes to the reception process of the uplink at the AP will be described.

[0035] By this method, for example, the interference that the transmission of the P2P link causes to the reception process of the uplink at the AP can be reduced, so that the throughput of the uplink can be improved.

[0036] (Embodiment 1) [Configuration of Wireless Communication System] The wireless communication system according to the present embodiment may include, for example, an AP100 and a STA200.

[0037] For example, in the present embodiment, the AP100 may notify the STA200 of information regarding the transmission control of at least one of the uplink and the P2P link by a Trigger frame. "Notification" may be read as "transmission" or "instruction". The STA200 may perform at least one of the uplink transmission and the P2P link transmission based on, for example, the Trigger frame notified from the AP100.

[0038] Hereinafter, a configuration example of the AP100 and the STA200 according to the present embodiment will be described.

[0039] FIG. 11 is a block diagram showing a partial configuration example of the STA200 according to an embodiment of the present disclosure. In the STA200 shown in FIG. 11, a control unit (for example, corresponding to a control circuit) performs transmission power control of a second link (for example, an STA-STA link or a DiL) to another STA based on parameters related to a first link (for example, an AP-STA link) to the AP100. A transmission unit (for example, corresponding to a transmission circuit) transmits a signal on the second link in accordance with the transmission power control.

[0040] [Configuration Example of AP100] FIG. 12 is a block diagram showing a configuration example of the AP100. The AP100 shown in FIG. 12 may include, for example, a scheduler unit 101, a control signal generation unit 102, a transmission signal generation unit 103, a wireless transmission / reception unit 104, and a received signal demodulation / decode unit 105.

[0041] For example, the scheduler unit 101 and the control signal generation unit 102 may be included in an access control unit (for example, a MAC processing unit), and the transmission signal generation unit 103 and the received signal demodulation / decode unit 105 may be included in a baseband (BB) processing unit.

[0042] The scheduler unit 101 may control, for example, the scheduling for the STA200. For example, the scheduler unit 101 may determine scheduling information such as resource allocation and Modulation and Coding Scheme (MCS) for each STA200 based on information (for example, feedback information) input from the received signal demodulation / decode unit 105. Further, the scheduler unit 101 may determine parameters related to transmission power control for the uplink or P2P link (for example, transmission power control parameters) such as the transmission power of the AP100 and the Target RSSI. The scheduler unit 101 may output control information including the determined scheduling information or transmission power control parameters to the control signal generation unit 102. Note that an example of a method for setting transmission power control parameters (for example, Target RSSI) for the P2P link will be described later.

[0043] The control signal generation unit 102 may generate, for example, a control signal (e.g., Trigger frame) for the STA 200. For example, the control signal generation unit 102 may generate a control signal based on control information (e.g., resource allocation results to each STA 200, or transmission power control parameters) input from the scheduler unit 101.

[0044] The control signal may include, for example, at least one of time and frequency resource information (e.g., Resource Unit (RU) allocation information, TXOP, LENGTH, etc.), transmission power control parameters (e.g., transmission power of the AP 100, or Target RSSI, etc.), information related to the generation of uplink or P2P link transmission signals (e.g., MCS, guard interval (GI), long training field (LTF) mode, etc.), Trigger type for notifying the type of the control signal, and terminal identification information (e.g., association ID (AID)).

[0045] Note that the information related to the generation of P2P link transmission signals (e.g., MCS, GI, LTF mode, etc.) is not limited to being determined (or instructed) by the AP 100. For example, it may be determined by the DLS STA. In this case, information such as MCS, GI, and LTF mode does not have to be notified from the AP 100. An example of the Trigger frame format for the P2P link will be described later.

[0046] The control signal generation unit 102 outputs, for example, the generated control signal to the transmission signal generation unit 103.

[0047] The transmission signal generation unit 103 performs encoding and modulation processing on, for example, the control signal input from the control signal generation unit 102, or data and ACK / Block-ACK. The transmission signal generation unit 103 may add, for example, a pilot signal used for frequency synchronization or timing synchronization at the receiving side (e.g., STA200), a channel estimation signal (e.g., LTF, or Extremely High Throughput (EHT)-LTF), etc. to the modulated signal to generate a radio frame (transmission signal). The transmission signal generation unit 103 outputs the generated transmission signal to the wireless transceiver unit 104.

[0048] The wireless transceiver unit 104 performs wireless transmission processing such as D / A conversion and up-conversion to the carrier frequency on the transmission signal input from the transmission signal generation unit 103, and transmits the signal after the wireless transmission processing via an antenna.

[0049] When the AP 100 receives, for example, an uplink signal (e.g., uplink response signal (TB-PPDU)) and feedback information transmitted from the STA 200, it may operate as follows.

[0050] The radio signal received via the antenna is input to the wireless transceiver unit 104. The wireless transceiver unit 104 performs wireless reception processing such as down-conversion of the carrier frequency on the received radio signal, and outputs the signal after the wireless reception processing to the received signal demodulation and decoding unit 105.

[0051] The received signal demodulation and decoding unit 105 may perform processing such as autocorrelation processing on the signal input from the wireless transceiver unit 104 to extract the received radio frame. Further, the received signal demodulation and decoding unit 105 may decode and demodulate, for example, the uplink response signal (e.g., TB-PPDU) and feedback information from the STA 200 included in the extracted radio frame. The received signal demodulation and decoding unit 105 may output the feedback information to the scheduler unit 101, for example.

[0052] [Configuration example of STA200] FIG. 13 is a block diagram showing a configuration example of the STA200 according to the present embodiment. The STA200 shown in FIG. 13 may include, for example, a wireless transmission / reception unit 201, a received signal demodulation / decode unit 202, a transmission power calculation unit 203, a signal generation unit 204, a transmission control unit 205, and a transmission signal generation unit 206.

[0053] For example, the control unit shown in FIG. 11 may correspond to a processing unit related to the generation of a transmission signal in FIG. 13 (for example, the received signal demodulation / decode unit 202, the transmission power calculation unit 203, the signal generation unit 204, the transmission control unit 205, and the transmission signal generation unit 206, etc.). Also, the transmission unit shown in FIG. 11 may correspond to, for example, the wireless transmission / reception unit 201 shown in FIG. 13.

[0054] Also, for example, the transmission power calculation unit 203, the signal generation unit 204, and the transmission control unit 205 may be included in the access control unit, and the received signal demodulation / decode unit 202 and the transmission signal generation unit 206 may be included in the baseband processing unit.

[0055] The wireless transmission / reception unit 201 receives, for example, a signal transmitted from the AP100 or another STA200 via an antenna, performs wireless reception processing such as down-conversion and A / D conversion on the received signal, and outputs the signal after the wireless reception processing to the received signal demodulation / decode unit 202. Also, the wireless transmission / reception unit 201 may perform wireless transmission processing such as D / A conversion and up-conversion to the carrier frequency on the signal input from the transmission signal generation unit 206. Further, the wireless transmission / reception unit 201 may transmit the signal after the wireless transmission processing via an antenna based on, for example, the transmission power instructed from the transmission power calculation unit 203.

[0056] The received signal demodulation and decoding unit 202 may perform processing such as autocorrelation processing on the signal input from the wireless transceiver unit 201, and extract the received wireless frame. The received signal demodulation and decoding unit 202 may demodulate and decode, for example, a control signal (e.g., Trigger frame) included in the extracted wireless frame, and output transmission power control parameters such as AP TX Power or Target RSSI to the transmission power calculation unit 203.

[0057] For example, when the extracted wireless frame is a signal from another STA200, the received signal demodulation and decoding unit 202 may demodulate and decode the data, control signal, and feedback information included in the wireless frame. The received signal demodulation and decoding unit 202 may output the extracted feedback information to the transmission control unit 205, for example.

[0058] Note that the STA200 may determine whether the transmission instructed by the Trigger frame is an uplink transmission or a P2P link transmission, for example, based on the control information included in the Trigger frame. The control information included in the Trigger frame may be, for example, 1-bit signaling that distinguishes between uplink transmission and P2P link transmission (see, for example, Non-Patent Document 4).

[0059] Alternatively, instead of the above-described 1-bit signaling, the STA200 may determine the distinction between uplink transmission and P2P link transmission based on the AID. In the case of determination based on the AID, the STA200 may have, for example, two AIDs: an AID for uplink communication and an AID for P2P link communication. By controlling to distinguish uplink transmission and P2P link transmission based on the AID, additional signaling may not be required.

[0060] Alternatively, instead of the 1-bit signaling described above, STA200 may distinguish uplink transmission and P2P link transmission based on an unused setting value (e.g., 15) in the MCS field of the Trigger frame. In the case of P2P link transmission, the MCS may be determined by the DLS STA rather than the AP100. Therefore, STA200 can determine whether the transmission instructed by the Trigger frame is uplink transmission or P2P link transmission based on the MCS setting value that is not used in the Trigger frame for uplink communication in the MCS field that is not used for P2P link transmission. Thus, by controlling to distinguish uplink transmission and P2P link transmission based on the setting value of the MCS field, additional signaling may not be necessary. Note that the signaling for distinguishing uplink transmission and P2P link transmission described above is not limited to, for example, the unused setting value of the MCS field, and may be notified by the unused setting value of other fields.

[0061] Also, the received signal demodulation and decoding unit 202 may output, for example, time and frequency resource information (e.g., RU allocation information, TXOP, LENGTH, etc.) or control parameters such as MCS, GI, and LTF mode to the transmission signal generation unit 206.

[0062] The transmission power calculation unit 203 may calculate, for example, the transmission power of an uplink signal (e.g., uplink response signal) or a P2P signal. For example, the transmission power calculation unit 203 may calculate the transmission power of the uplink response signal or the P2P signal based on the transmission power control parameters (e.g., AP TX Power and Target RSSI) input from the received signal demodulation and decoding unit 202 and the path loss (not shown) estimated from the downlink signal. The transmission power calculation unit 203 may output, for example, information regarding the calculated transmission power to the wireless transceiver unit 201. Note that an example of the transmission power calculation method for P2P link transmission in the transmission power calculation unit 203 will be described later. "Calculation" may be read as "determination".

[0063] The signal generation unit 204 may generate, for example, an uplink response signal or a P2P-oriented signal, and output the generated uplink response signal or P2P-oriented signal to the transmission signal generation unit 206. The uplink response signal may include, for example, the ID of the STA 200 and the transmission information of the STA 200 (e.g., data, transmission buffer status notification (e.g., BSR: Buffer Status Report), or DL Data request, etc.).

[0064] The transmission control unit 205 may determine, for example, control parameters related to the transmission of the P2P link such as MCS, GI, or LTF mode based on the feedback information from another STA 200 input from the reception signal demodulation and decoding unit 202, and output the determined control parameters to the transmission signal generation unit 206.

[0065] The transmission signal generation unit 206 may perform encoding and modulation on the uplink response signal or P2P-oriented signal input from the signal generation unit 204 based on, for example, control parameters (e.g., MCS, GI, LTF mode, etc.) input from the reception signal demodulation and decoding unit 202 or control parameters input from the transmission control unit 205. The transmission signal generation unit 206 may add, for example, a pilot signal, a control signal (preamble) such as a channel estimation signal, etc., used for frequency synchronization or timing synchronization at the receiving side (e.g., AP 100 or another STA 200) to the modulated signal, and generate a radio frame (transmission signal). The transmission signal generation unit 206 may output the generated transmission signal to the radio transceiver unit 201, for example.

[0066] [Operation Examples of AP and STA] Next, operation examples of the AP 100 and STA 200 of the present embodiment will be described.

[0067] In this embodiment, the STA200 (e.g., DLS STA) may perform transmission power control of the P2P link based on parameters (e.g., path loss) related to a link (e.g., AP-STA link or uplink) between the AP100 and the STA200. The parameters related to the AP-STA link may be, for example, parameters indicating the quality of the AP-STA link (or the state of the AP-STA link).

[0068] Also, for example, the AP100 may transmit information regarding the transmission power of the AP100 and information regarding the Target RSSI of the P2P link (e.g., the target received signal strength of the signal from the DLS STA at the AP100) to the STA200, which is the DLS STA. The STA200 may perform transmission power control of the P2P link based on, for example, the transmission power of the AP100, the Target RSSI of the P2P link, and the path loss in the link between the AP100 and the STA200.

[0069] For example, the AP100 may set the Target RSSI of the P2P link based on the Target RSSI set for the uplink resource. FIG. 14 is a diagram showing an example of setting the Target RSSI of the P2P link.

[0070] In the example shown in FIG. 14, the frequency resource (e.g., RU) allocated to the P2P link (or STA-STA link) is adjacent to the frequency resource allocated to the uplink (or AP-STA link). In this case, the AP100 may determine the Target RSSI of the P2P resource based on, for example, the Target RSSI set for the uplink resource adjacent to the P2P resource. For example, the AP100 may set any one of the minimum value, maximum value, and average value of the Target RSSIs of the uplink resources adjacent to the P2P resource as the Target RSSI of the P2P resource.

[0071] By setting the Target RSSI of the P2P link, for example, in AP100, the received power of the P2P link signal that may cause interference is likely to be similar to the received power of the uplink signal in AP100. Therefore, in AP100, since the difference in received power between the P2P link signal and the uplink signal is reduced, interference from the P2P link signal to the uplink signal can be reduced.

[0072] Note that the Target RSSI setting of the P2P resource is not limited to the minimum value, maximum value, and average value of the Target RSSI set for adjacent uplink resources. For example, AP100 may set the Target RSSI of the P2P resource to a value obtained by adding an offset based on the allowable interference amount to the Target RSSI (e.g., minimum value, maximum value, or average value) set for the uplink resource adjacent to the P2P resource.

[0073] Also, the Target RSSI setting of the P2P resource is not limited to being based on the Target RSSI of the uplink resource adjacent to the P2P resource, and may be based on at least one of the Target RSSIs of the uplink resources within a specified range from the P2P resource.

[0074] Next, a method for calculating the transmission power for P2P and an example of the Trigger frame format will be described.

[0075] <Example 1> In Example 1, STA200 (e.g., DLS STA) may control the transmission power of the P2P link based on, for example, the state of the uplink (e.g., AP-STA link) and the information indicated in the Trigger frame (e.g., the Target RSSI of the P2P link and the transmission power of AP100).

[0076] As an example of the state of the AP-STA link, the path loss in the AP-STA link can be mentioned. For example, STA200 may control the transmission power of the P2P link based on the path loss in the AP-STA link.

[0077] Also, for example, the Trigger frame for P2P may have the same format as the Trigger frame for the uplink of 11ax. FIG. 15 shows an example of the Common info field included in the Trigger frame for P2P, and FIG. 16 shows an example of the User Info field included in the Trigger frame for P2P.

[0078] For example, the Common info field shown in FIG. 15 may be provided with a field indicating the transmission power of AP100 (e.g., AP TX Power), and the User info filed shown in FIG. 16 may be provided with a field indicating Target RSSI (UL Target RSSI).

[0079] Note that in the Trigger frame format shown in FIGS. 15 and 16, some fields may not exist, and new fields may be added.

[0080] For example, the Target RSSI of the P2P link indicated by the Trigger frame may be regarded as the allowable interference amount in AP100.

[0081] As an example, the configuration example of the wireless communication system shown in FIG. 8 will be described. STA2 (e.g., DLS STA) may set the transmission power of the P2P link to be equal to or less than the transmission power (in other words, the upper limit value of the transmission power) calculated based on, for example, the path loss of the AP-STA2 link, the Target RSSI indicated by the Trigger frame, and the transmission power of the AP.

[0082] In other words, STA200 may perform transmission power control of the P2P link so that, for example, the reception power of the P2P signal in AP100 is set to be equal to or less than the Target RSSI indicated by the Trigger frame. For example, STA200 may use the reception power of the downlink signal from AP100 (e.g., DLRSSI ) Based on the transmission power of AP100 (e.g., Tx) indicated by the Trigger frame pwr AP , the path loss of the AP-STA link (e.g., PL) may be calculated according to Equation (3). AP-STA )

Number

[0083] Also, STA200 may calculate, for example, the transmission power (e.g., Tx) of the P2P link that AP100 can tolerate according to Equation (4) based on the calculated path loss (e.g., PL AP-STA ) and the Target RSSI of the P2P link (e.g., Target) indicated by the Trigger frame RSSI ). pwr_limit )

Number

[0084] And STA200 may set the transmission power of the P2P link transmission (e.g., Tx pwr P2P ) to a value equal to or less than the calculated transmission power (Tx pwr_limit ), for example, as shown in Equation (5).

Number

[0085] An example of the processing procedure for the transmission power control of the above-described P2P link is shown below.

[0086] (Step 1) STA200, for example, based on information related to the P2P link (e.g., quality information), determines the transmission power of the P2P link (Tx pwrIt may be determined. As an example of information regarding the P2P link, for example, the MCS, path loss, or packet error rate of the P2P link can be mentioned. Note that the STA200 may set a pre-specified transmission power (for example, a fixed transmission power such as the maximum transmission power) as the P2P link transmission power.

[0087] (Step 2) The STA200 measures, for example, the received power of the downlink signal from the AP100 (for example, DL RSSI ) and, based on the measured received power of the downlink signal and the transmission power of the AP100 (for example, Tx pwr AP ) indicated by the Trigger frame, may calculate the path loss (for example, PL AP-STA ) of the AP-STA link according to Equation (3). Then, the STA200 may obtain, for example, the transmission power (for example, Tx RSSI ) of the P2P link acceptable to the AP100 according to Equation (4) based on the path loss and the Target RSSI (for example, Target pwr_limit ) indicated by the Trigger frame.

[0088] (Step 3) The STA200 may set, for example, the smaller power value among the transmission power Tx pwr calculated in Step 1 and the transmission power Tx pwr_limit calculated in Step 2 as the transmission power for P2P link transmission.

Equation

[0089] In this way, the STA200 performs transmission power control of the P2P link based on, for example, the path loss of the AP-STA link.

[0090] For example, the transmission power Tx pwr calculated based on the information regarding the P2P link is the transmission power Tx pwr_limit of the P2P link acceptable to the AP100.If it is greater than, STA200 may set the transmission power of the P2P link to Tx pwr_limit In this way, for example, even when the P2P link signal can interfere with AP100, AP100 can reduce the influence caused by the interference of the P2P link signal.

[0091] Also, for example, the transmission power Tx calculated based on information about the P2P link pwr If it is less than or equal to the transmission power Tx of the P2P link that AP100 can tolerate pwr_limit In this case, STA200 may set the transmission power of the P2P link to Tx pwr In this way, STA200 can suppress interference with AP100, for example, and perform P2P link transmission with a transmission power suitable for the state (e.g., quality) of the P2P link.

[0092] As described above, since the interference that P2P link transmission causes to the uplink reception process in AP100 can be reduced, the uplink throughput can be improved.

[0093] <Example 2> In Example 2, for example, similar to Example 1, STA200 (e.g., DLS STA) may control the transmission power of the P2P link based on the state of the uplink (e.g., the path loss of the AP-STA link) and the information indicated by the Trigger frame (e.g., the Target RSSI of the P2P link and the transmission power of AP100).

[0094] In Example 2, STA200 may control the transmission power of the P2P link based on, for example, parameters related to beamforming in STA200. For example, when control is performed to direct a NULL in the direction of AP100 by beamforming control, the interference to AP100 by the P2P link signal transmitted from STA200 is reduced. In this case, STA200 may, for example, increase the transmission power of the P2P link. In other words, there is a possibility that the limitation on the transmission power of the P2P link in STA200 can be relaxed.

[0095] Note that the Trigger frame for P2P in Example 2 may be the same as that in Example 1 (for example, FIGS. 15 and 16).

[0096] An example of the processing procedure for the transmission power control of the P2P link described above is shown below.

[0097] (Step 1) The STA 200 may determine the transmission power (Tx pwr ) of the P2P link based on information related to the P2P link (for example, quality information). Examples of information related to the P2P link include, for example, the MCS, path loss, or packet error rate of the P2P link. Note that the STA 200 may set a pre-defined transmission power (for example, a fixed transmission power such as the maximum transmission power) as the P2P link transmission power.

[0098] (Step 2) The STA 200 measures, for example, the reception power of the downlink signal from the AP 100 (for example, DL RSSI ), and based on the measured reception power of the downlink signal and the transmission power of the AP 100 (for example, Tx pwr AP ) indicated by the Trigger frame, calculates the path loss (for example, PL AP-STA ) of the AP-STA link according to Equation (3). Then, the STA 200 obtains, for example, the allowable transmission power of the P2P link (for example, Tx RSSI ) of the AP 100 according to Equation (4) based on the path loss and the Target RSSI (for example, Target pwr_limit ) indicated by the Trigger frame.

[0099] (Step 3) When the transmission power Tx pwr calculated in Step 1 is less than or equal to the transmission power Tx pwr_limit calculated in Step 2, the STA 200 may set the transmission power of the P2P link to Tx pwr and end the calculation process of the P2P-oriented transmission power.

[0100] On the other hand, for example, when the transmission power Tx of STA200 pwr is greater than the transmission power Tx pwr_limit , the processing after step 4 may be performed.

[0101] (Step 4) For example, STA200 may estimate information regarding the degree of interference reduction given to AP100 (in other words, parameters regarding beamforming. For example, BF effect ) based on, for example, beamforming applied in STA200 (such as precoding, antenna switching control, etc.) and the channel estimation value between AP and STA. Note that the channel estimation value between AP and STA may be estimated from at least one of EHT-LTF and LTF of a PPDU including a trigger frame, or may be estimated based on a downlink Null Data Packet (NDP). Also, for example, STA200 may transmit an NDP to AP100 and receive feedback information including the channel estimation value estimated based on the NDP at AP100.

[0102] For example, STA200 may calculate an offset (for example, BF effect ) corresponding to the degree of interference reduction given to AP100 according to Equation (7), add it to the transmission power Tx limit , and calculate the transmission power Tx' pwr_limit of the allowable P2P link after offset addition for AP100. For example, the greater the degree of interference reduction given to AP100, the greater the value of BF effect may be set. [Number]

[0103] (Step 5) For example, STA200 may set the smaller power value among the transmission power Tx pwr calculated in step 1 and the transmission power Tx' pwr_limit calculated in step 4 as the transmission power for P2P link transmission.

[0104] In this way, the STA200 performs transmission power control of the P2P link based on, for example, the path loss of the AP-STA link and the parameters related to beamforming in the STA200. Thereby, similar to Example 1, since the interference that the transmission of the P2P link gives to the uplink reception process in the AP100 can be reduced, the uplink throughput can be improved. Also, in Example 2, according to the beamforming control, in the P2P link, the reduction of the transmission power for interference suppression to the AP100 can be suppressed (in other words, it becomes easier to increase the transmission power of the P2P link).

[0105] <Example 3> In Example 1 or Example 2, the case where the allowable interference amount (for example, Target RSSI) notified by the Trigger frame is one was described. In Example 3, the case where the allowable interference amount (for example, Target RSSI) notified by the Trigger frame is plural will be described.

[0106] Each of the plural Target RSSIs may be associated with, for example, the priority for the transmission of the P2P link.

[0107] For example, the Target RSSI (or the allowable interference amount) corresponding to the transmission of the P2P link with a higher priority may be set high, and the Target RSSI (or the allowable interference amount) corresponding to the transmission of the P2P link with a lower priority may be set low. In other words, the higher the priority of the transmission of the P2P link, the more communication with a high transmission power becomes possible.

[0108] FIG. 17 is a diagram showing an example of the Trigger frame format (User Info field) when two priorities (for example, high priority and low priority) are set. Note that the number of priorities to be set is not limited to two, and may be three or more.

[0109] In FIG. 17, for example, a Target RSSI for high-priority P2P link transmission may be set in a “UL Target RSSI” field similar to 11ax shown in FIG. 2, and a Target RSSI for low-priority P2P link transmission may be set in a “UL Target RSSI#2” field.

[0110] The set value of the “UL Target RSSI#2” field may be, for example, a value indicating the absolute value of the RSSI shown in FIG. 18 (for example, any value in a 7-bit table), similar to the set value of the “UL Target RSSI” field, or a value indicating a relative offset from the set value of the “UL Target RSSI” field.

[0111] Also, for example, when a plurality of Target RSSIs for each priority are set (or notified), the number of bits of the field related to “UL Target RSSI” may be set (or changed) to a value different from the number of bits defined in 11ax. For example, in FIG. 17, the “UL Target RSSI” field may be configured with 4 bits, and the “UL Target RSSI#2” field may be configured with 3 bits. In this way, by suppressing an increase in Target RSSI signaling, the signaling overhead can be reduced. Also, for example, in the User Info field shown in FIG. 17, an increase in the number of bits can be suppressed compared to the User Info field of 11ax. Note that the number of bits of the “UL Target RSSI” field and the “UL Target RSSI#2” field is not limited to the above-described example, and other numbers of bits may be used.

[0112] Here, for example, the smaller the number of bits of the field related to UL Target RSSI, the lower the amount of information that can be notified. Therefore, for example, at least one value of the maximum value (for example, -20 dBm in 11ax) and the minimum value (for example, -110 dBm in 11ax) that can be notified may be changed in at least one of the "UL Target RSSI" field and the "UL Target RSSI#2" field. For example, the maximum value that can be notified may be changed to a lower value, and the minimum value that can be notified may be changed to a higher value. In other words, the values that can be notified may be changed to a narrower range of values.

[0113] Or, for example, by making the step width of Target RSSI larger, the range of Target RSSI that can be set by a certain number of bits may be expanded. For example, the step width of Target RSSI is a step width in units of 1 dB in 11ax. In FIG. 17, for example, the step width of Target RSSI may be a step width in units larger than 1 dB (for example, 2 dB, 3 dB, or 4 dB or more).

[0114] Also, for example, fields such as the "UL-HE-MCS" field or the "UL Dual subcarrier Modulation (DCM)" field shown in FIG. 17 may be replaced with notification fields for a plurality of Target RSSI (for example, "UL Target RSSI#2") (not shown). In a P2P link, for example, MCS and DCM may be determined by the DLS STA instead of the AP100. In this case, the DLS STA does not need to be notified of the corresponding set values in the "UL-HE-MCS" field and the "UL DCM" field from the AP100. Therefore, the STA200 (for example, the DLS STA) may receive information related to a plurality of Target RSSI in the "UL-HE-MCS" field and the "UL DCM" field in the Trigger frame.

[0115] Note that the fields corresponding to the parameters determined by the DLS STA in the P2P link (in other words, the parameters not determined by the AP100), not limited to the "UL-HE-MCS" field and the "UL DCM" field, may be replaced with the notification fields of a plurality of Target RSSIs.

[0116] The priority may be controlled (or determined, set) based on, for example, the frame type of the PPDU in P2P link transmission (e.g., frame type such as Management, Control frame), Access category (AC), or TID (or traffic type).

[0117] FIGs. 19, 20, 21, and 22 are diagrams showing examples of priority settings.

[0118] FIG. 19 is a diagram showing an example in which the priority is set according to the type of frame type. In FIG. 19, for example, the priority of a frame for transmitting control information (e.g., Management frame or Control frame) may be set higher than the priority of a frame for transmitting data (e.g., Data frame). With the priority setting shown in FIG. 19, for example, in P2P link transmission, the reception quality of control information can be improved compared to data, so that, for example, an increase in delay such as connection processing can be suppressed. Note that the type of frame type may be a type different from Management frame, Control frame, and Data frame.

[0119] FIG. 20 is a diagram showing an example in which priorities are set according to the transmission type among the same frame types in addition to the types of frame types in FIG. 19. For example, in FIG. 20, among the Control frames, the priorities of ACK and Block-ACK may be set higher than the priorities of other types different from ACK and Block-ACK. According to the priority setting shown in FIG. 20, for example, in P2P link transmission, the reception quality of ACK and Block-ACK can be improved compared with other control information, so that, for example, an increase in delay such as retransmission processing can be suppressed.

[0120] FIG. 21 is a diagram showing an example in which priorities are set according to AC (Access Category). In FIG. 21, for example, the priorities of ACs with higher delay requirement conditions (for example, AC_VO (access category voice), AC_VI (access category video)) may be set higher than the priorities of ACs with lower delay requirement conditions (for example, AC_BK (access category background), AC_BE (access category best effort)). According to the priority setting shown in FIG. 21, for example, in P2P link transmission, the delay of information corresponding to an AC with a higher delay requirement condition can be suppressed. Note that the types of ACs may be different from the types shown in FIG. 21.

[0121] FIG. 22 is a diagram showing an example in which priorities are set according to TID. In FIG. 22, for example, the priorities may be set according to the delay requirement conditions corresponding to the TID. For example, the priorities of TIDs of 4 or more may be set higher than the priorities of TIDs less than 4. Note that in FIG. 22, the threshold value for TID regarding the priority setting is not limited to 4 and may be other values. Also, for example, for a TID not used in 11ax (for example, a value greater than 7), the highest priority may be set as a service with a higher urgency.

[0122] Note that the priority settings shown in FIGS. 19, 20, 21, and 22 may be combined. For example, by combining FIGS. 19 and 21, the priorities of Management frame, Control frame, and a part of AC in Data frame (e.g., AC_VO and AC_VI) may be set higher than the priorities of other AC in Data frame (e.g., AC_BK and AC_BE).

[0123] Thus, in Example 3, the AP100 may instruct the STA200 with a plurality of Target RSSIs corresponding to the priorities of P2P link transmissions respectively. Also, for example, for P2P link transmissions with higher priorities, the corresponding Target RSSI (or allowable interference amount) may be set higher. Thereby, the STA200 can, for example, set a higher transmission power for P2P link transmissions with high priorities, so that the communication quality of the P2P link can be improved.

[0124] Note that the priorities are not limited to two types (e.g., "High priority" and "low priority"), and three or more types may be set.

[0125] The method for calculating the transmission power for P2P and an example of the Trigger frame format have been described above.

[0126] Thus, in this embodiment, the STA200 performs transmission power control of a P2P link (or STA-STA link) to another STA based on parameters (e.g., path loss) related to the AP-STA link to the AP100, and transmits a signal in the P2P link according to the transmission power control.

[0127] With this transmission power control, for example, as shown in FIG. 8, when both the uplink transmission triggered by a Trigger frame and the P2P link transmission are performed, interference (e.g., Adjacent channel interference) imposed on the AP by the P2P link transmission by STA2 can be suppressed. Therefore, according to this embodiment, degradation of the reception performance of the uplink signal can be suppressed, and the uplink throughput can be improved.

[0128] In this embodiment, the case where STA200 performs transmission power control of the P2P link based on the state of the AP-STA link has been described, but it is not limited to this operation. For example, STA200 may switch between transmission power control based on the state of the AP-STA link and transmission power control based on the state of the P2P (STA-STA) link based on the instruction information from AP100.

[0129] The instruction information regarding the switching of the transmission power control may be notified from AP100 to STA200 by, for example, a Trigger frame, a beacon, or other control information.

[0130] The method of notifying the switching of the transmission power control may be, for example, a method of notifying a flag (e.g., a 1-bit flag) that indicates either one of the above-described two types of transmission power controls in the User Info field or the Common info field of the Trigger frame.

[0131] Also, the switching of the transmission power control may be, for example, a method of setting a certain value in the "UL Target RSSI" field of the User Info field of the Trigger frame. For example, when the set value (e.g., FIG. 18) of the "UL Target RSSI" field is '127', STA200 may perform transmission power control based on the state of the P2P link, and when the set value of the "UL Target RSSI" field is a value different from '127', STA200 may perform transmission power control based on the state of the AP-STA link.

[0132] The AP100 may determine a switch between transmission power control based on the state of the AP-STA link and transmission power control based on the state of the P2P (STA-STA) link, for example, based on the resource allocation results of the uplink and P2P links, or based on the parameters set for the uplink. For example, by scheduling in the AP100, when the resources adjacent to the P2P resources are not allocated to the uplink, it is difficult to affect the Adjacent channel interference for the uplink. Or, when robust parameters (e.g., MCS) are set for the uplink, it is difficult to affect the Adjacent channel interference for the uplink. Thus, the AP100 may instruct the STA200 to switch the transmission power control method of the P2P link based on the degree of influence of the interference that can be given from the P2P link to the uplink. Thereby, the interference to the UL link caused by the P2P link transmission can be suppressed, and the deterioration of the communication quality of the P2P link can be suppressed.

[0133] (Embodiment 2) In Embodiment 1, a method for controlling the transmission power of the P2P link based on the state of the AP-STA link was described. Here, in the transmission power control of the P2P link based on the state of the AP-STA link, the quality of the P2P link may not be guaranteed. Therefore, in this embodiment, for example, in addition to the state of the AP-STA link, a method for controlling the transmission power of the P2P link based on the state of the P2P link (or, STA-STA link) will be described.

[0134] The wireless communication system according to this embodiment may include, for example, the AP100 and the STA300.

[0135] In this embodiment, for example, STA300 (e.g., DLS STA) feeds back information regarding the state of the P2P link (e.g., quality information) to AP100, and AP100 determines the Target RSSI for the P2P link based on the fed-back information regarding the state of the P2P link. Thereby, STA300 can perform transmission power control of the P2P link based on, for example, the state of the AP-STA link and the state of the P2P link.

[0136] The information regarding the state of the P2P link may include, for example, information regarding the Tareget RSSI (interference tolerance amount) required by the DLS STA (hereinafter referred to as "Required Target RSSI"). For example, STA300 (DLS STA) may calculate the Required Target RSSI based on the quality information of the P2P link and notify (or feed back) the information regarding the calculated Required Target RSSI to AP100. AP100 may determine (or adjust) the Target RSSI of the resources of the P2P link based on, for example, the Required Target RSSI notified from STA300.

[0137] In this way, in the transmission power control of the P2P link, by basing on the state of the P2P link in addition to the state of the AP-STA link, the quality of the P2P link can be ensured, and the interference that the P2P link transmission exerts on the uplink reception process in AP100 can be reduced.

[0138] [Configuration of AP] The configuration example of AP100 according to this embodiment may be the same as the configuration example of Embodiment 1. AP100 may set (or adjust) the Target RSSI for P2P based on, for example, the Required Target RSSI notified from STA300.

[0139] Note that an example of the method for setting the P2P-oriented Target RSSI using the Required Target RSSI will be described later.

[0140] [Configuration of STA] FIG. 23 is a block diagram showing a configuration example of the STA 300 according to the present embodiment. In FIG. 23, the same components as those in the first embodiment (FIG. 13) are denoted by the same reference numerals, and the description thereof is omitted.

[0141] In FIG. 23, for example, the Required Target RSSI calculation unit 301 may calculate an allowable value (for example, Required Target RSSI) of the interference amount that the transmission of the P2P link gives to the AP 100 based on feedback information (for example, CSI or path loss) from another STA (for example, DLP STA) input from the reception signal demodulation / decoding unit 202, or information such as the packet error rate of the P2P link. An example of the method for calculating the Required Target RSSI in the Required Target RSSI calculation unit 301 will be described later.

[0142] Further, for example, the Required Target RSSI calculation unit 301 may generate control information including information regarding the calculated Required Target RSSI based on a specified format, and output the control information to the transmission signal generation unit 206.

[0143] An example of the format of the control information including information regarding the Required Target RSSI will be described later.

[0144] [Operation Examples of AP and STA] Next, operation examples of the AP 100 and the STA 300 according to the present embodiment will be described.

[0145] [Method for Setting Target RSSI for P2P] The AP100 may set the Target RSSI of the P2P resource (for example, referred to as the set Target RSSI) based on the Target RSSI set for the uplink resource adjacent to the P2P resource (for example, RU) assigned by scheduling, similar to Embodiment 1 (for example, FIG. 14).

[0146] Also, the AP100 may adjust the set Target RSSI based on, for example, the Required Target RSSI fed back from the STA300. For example, if the Required Target RSSI is higher than the set Target RSSI, the AP100 may increase the Target RSSI of the P2P resource to an acceptable interference level.

[0147] Also, when the AP100 increases the Target RSSI of the P2P resource, it may reduce the MCS of the uplink resource adjacent to the P2P resource. Thereby, for example, even when the interference from the P2P resource increases, the reception error of uplink data can be reduced at the AP100. Note that the parameter changed based on the adjustment of the Target RSSI of the P2P resource is not limited to the MCS, and other parameters may also be used.

[0148] Also, for example, when the Required Target RSSI is less than or equal to the set Target RSSI, the AP100 may apply the set Target RSSI (in other words, it does not have to be adjusted).

[0149] Note that, for example, the AP100 does not have to allocate a P2P resource to a STA300 that has fed back a Required Target RSSI greater than the Target RSSI set for the uplink resource adjacent to the P2P resource. By not allocating a resource to the corresponding STA300, for example, the interference caused by the transmission of the P2P link to the uplink reception can be eliminated.

[0150] <Required Target RSSI Calculation Method> An example of the method for calculating the Required Target RSSI in STA300 will be described.

[0151] STA300, for example, based on feedback information (such as CSI or path loss, etc.) from another STA (such as DLP STA) in the P2P link, may calculate the transmission power (such as Tx pwr P2P ) in the P2P link. Note that the transmission power Tx in the P2P link pwr P2P may be a pre-defined fixed transmission power (such as the maximum transmission power).

[0152] Also, STA300, for example, based on the downlink signal (such as beacon or Trigger frame, etc.) from AP100, may estimate the path loss (such as PL Ap-STA ) between the AP and the STA.

[0153] Then, STA300, for example, may calculate the Required Target RSSI (RequiredTarget RSSI ) according to the following formula (8).

Equation

[0154] <Control Information Format Regarding Required Target RSSI> An example of the format of the control information regarding the Required Target RSSI notified from STA300 to AP100 (such as Format 1 to 4) will be described.

[0155] <Format 1> FIG. 24 is a diagram showing an example of the format of the control information in Format 1.

[0156] The format shown in FIG. 24 may be a format obtained by partially modifying, for example, the format of the Buffer Status Report (BSR) defined in 11ax (in other words, the control field related to the BSR). The format of the BSR may be, for example, the format of the Control Information subfield in the BSR Control subfield included in the HT Control field of the MAC frame.

[0157] For example, the control information defined in 11ax (for example, FIG. 7) is at most 26 bits. Also, in the BSR format of 11ax, each of the 26 bits is used to notify a certain control information. Therefore, when the Required Target RSSI is transmitted together with the BSR, the Required Target RSSI may be notified by reducing some of the bits of the control information notified in the 11ax BSR. For example, in FIG. 24, the bit sizes of the Queue sizes (for example, High and All) are each reduced from 8 bits in 11ax to 2 bits (for example, a total of 4 bits), and the Required Target RSSI may be transmitted in 4 bits.

[0158] The Required Target RSSI included in the BSR may be, for example, as shown in FIG. 18, a value indicating an absolute value, the Target RSSI notified by the Trigger frame, or an offset value relative to the Required Target RSSI notified to the AP100 in the past. For example, in FIG. 24, the bit size of the Required Target RSSI is 4 bits, which is less than the bit size (for example, 8 bits) of the 11ax Target RSSI shown in FIG. 18. Therefore, the range that can be notified (or the maximum value (-20 dBm in 11ax) or the minimum value (-110 dBm in 11ax)) in the Required Target RSSI field (4 bits) shown in FIG. 24 may be changed, and a larger step width such as 2 dB or 3 dB instead of a step width of 1 dB may be used.

[0159] Note that the notification bit of the Required Target RSSI is not limited to 4 bits and may be of other bit sizes. Also, the position of the notification bit of the Required Target RSSI is not limited to the end of the BSR format and may be at other positions. Further, the control information whose bit size is reduced in the BSR format in which the Required Target RSSI is notified is not limited to the Queue size and may be other control information.

[0160] Here, the Required Target RSSI is, for example, information attached to the data transmitted in the P2P link. In other words, for example, when there is no transmission data in the P2P link, the Required Target RSSI does not have to be notified. Therefore, like in Format 1, the STA 300 can improve the efficiency of notification from the STA 300 to the AP 100 by transmitting the Required Target RSSI to the AP 100 together with the BSR.

[0161] Also, by using the BSR format defined in 11ax for the notification of the Required Target RSSI, it is not necessary to define a new Control frame format.

[0162] Note that there are two methods for transmitting the BSR: for example, a method in which the transmission of the BSR is triggered by a Trigger frame transmitted from the AP 100 (for example, called "Solicited BSR"), and a method in which the STA 300 spontaneously transmits the BSR (for example, called "Unsolicited BSR").

[0163] FIG. 25 is a sequence diagram showing operation examples of AP100 (e.g., AP) and STA300 (e.g., STA#1, STA#2, and STA#3) in Solicited BSR. In FIG. 25, the AP may control each of the uplink and the P2P link. Also, in FIG. 25, for example, STA#1 may perform uplink communication with the AP. Further, in FIG. 25, for example, STA#2 (DLS STA) and STA#3 (DLP STA) may perform P2P communication.

[0164] In FIG. 25, when the AP acquires a TXOP, it may transmit a Trigger frame (or a control signal) whose type is Buffer States Report Poll (BSRP) to STA#1 and STA#2 (e.g., DLS STA). For example, the AP may transmit a common (or identical) Trigger frame to both STA#1 that transmits uplink data and STA#2 that transmits data in the P2P link.

[0165] When STA#1 and STA#2 receive the Trigger frame, they may transmit a BSR (e.g., TB-PPDU) to the AP. Note that STA#1 may transmit, to the AP, a BSR similar to that in 11ax (e.g., a BSR that does not include Required Target RSSI). On the other hand, STA#2 may transmit, to the AP, a BSR in the format shown in FIG. 24 (e.g., a BSR that includes Required Target RSSI).

[0166] The AP may transmit, for example, a Trigger frame that triggers transmission in the P2P link and uplink transmission based on the BSRs notified from STA#1 and STA#2. For example, the AP may perform control related to transmission power in the P2P link (e.g., setting of Target RSSI) based on the Required Target RSSI included in the BSR notified from STA#2.

[0167] STA#1 may perform uplink transmission, for example, based on a Trigger frame transmitted from an AP. Also, STA#2 may perform transmission (or transmission power control) of a P2P link to STA#3, for example, based on a Trigger frame transmitted from the AP.

[0168] Note that, for example, a flag indicating the required buffer status may be set (e.g., added) to the Trigger frame, among the buffer status of uplink data and the buffer status of P2P link data. For example, in the Trigger Dependent User info field within the User Info field, a BSR type field indicating the type of BSR (e.g., for uplink or for P2P link) may be set (e.g., added). For example, the bit size of the BSR type may be 1 bit. As an example, when the BSR type is 0, it may indicate the uplink, and when the BSR type is 1, it may indicate the P2P link.

[0169] Also, when requesting the BSR of the P2P link, information indicating the resource for STA300 to notify the Required Target RSSI may be set (or added) to the Trigger frame. For example, in the Trigger Dependent User info field, a notification field for the RU index or the channel index (e.g., the position of a 20MHz channel) may be set. STA300 may feedback the Required Target RSSI to AP100 using the resource notified by the RU index or the channel index, for example.

[0170] Also, STA300 may transmit the BSR for the P2P link, for example, in UL-Orthogonal Frequency Division Multiplexing (OFDMA)-based random access (UORA).

[0171] Figure 26 is a sequence diagram showing operation examples of the AP100 (e.g., AP) and the STA300 (e.g., STA#1, STA#2, and STA#3) in Unsolicited BSR. In Figure 26, the AP may control both the uplink and the P2P link. Also, in Figure 26, for example, STA#1 may perform uplink communication with the AP. Further, in Figure 26, for example, STA#2 (DLS STA) and STA#3 (DLP STA) may perform P2P communication.

[0172] In Figure 26, when STA#2 acquires a TXOP, for example, it may transmit a BSR (e.g., a BSR in the format shown in Figure 24) (e.g., a BSR including Required Target RSSI) (e.g., a Single User (SU) - PPDU) to the AP. Also, STA#1 may transmit a BSR similar to 11ax (e.g., a BSR not including Required Target RSSI) to the AP (not shown).

[0173] The AP may transmit a Trigger frame that triggers transmission on the P2P link and uplink transmission based on the BSRs notified from STA#1 and STA#2, for example. For example, the AP may perform control related to transmission power on the P2P link (e.g., setting of Target RSSI) based on the Required Target RSSI included in the BSR notified from STA#2.

[0174] STA#1 may perform uplink transmission based on the Trigger frame transmitted from the AP, for example. Also, STA#2 may perform transmission on the P2P link (e.g., transmission power control) to STA#3 based on the Trigger frame transmitted from the AP, for example.

[0175] Note that STA300 may send information including a flag indicating the buffer status to be sent to AP100 among the buffer status of uplink data and the buffer status of P2P link data to AP100. For example, STA300 may use the TID field in the QoS Control field (e.g., FIG. 3) to send information indicating either the buffer status of uplink data or the buffer status of P2P link data to AP100. For example, when a value of an unused TID (e.g., TID > 7) is set in the uplink, it may indicate the BSR for the P2P link, and when a TID used in the uplink (e.g., TID ≦ 7) is set, it may indicate the BSR for the uplink. Note that the BSR for the P2P link is, for example, a BSR including the Required Target RSSI as shown in FIG. 24, and the BSR for the uplink may be, for example, the same BSR as 11ax.

[0176] <Format 2> FIG. 27 is a diagram showing an example of the format of control information in Format 2.

[0177] The format shown in FIG. 27 may be, for example, a format obtained by partially modifying the format of the QoS Control field defined in 11ax (in other words, the control field related to the quality of service). For example, as shown in FIG. 27, the Required Target RSSI may be notified in a part of the QoS Control field. For example, in FIG. 27, instead of the Queue Size field, the Required Target RSSI field is set among the QoS Control fields defined in 11ax.

[0178] Also, for example, STA300 may notify AP100 whether the Required Target RSSI of the P2P link is included in the QoS Control field. For example, STA300 may notify AP100 of the presence or absence of the Required Target RSSI according to the set value of the TID. For example, when the value of an unused TID (e.g., TID > 7) is set in the uplink, the format of the QoS Control field that notifies the Required Target RSSI for the P2P link may be indicated. Also, for example, when the TID used in the uplink (e.g., TID ≦ 7) is set, the format of the QoS Control field similar to 11ax (e.g., a format that does not include the Required Target RSSI) may be indicated. Note that the notification of the presence or absence of the Required Target RSSI is not limited to the TID and may be notified by other information.

[0179] In this way, by using the format of the QoS Control field defined in 11ax for the notification of the Required Target RSSI, it is not necessary to define a new Control frame format.

[0180] Note that in FIG. 27, as an example, the case where the Required Target RSSI field is set instead of the Queue Size field in the QoS Control field defined in 11ax has been described, but it is not limited to this. The Required Target RSSI field may be set, for example, instead of other fields within the QoS Control field. Also, in FIG. 27, the bit size of the Required Target RSSI is not limited to 8 bits and may be other bit sizes (e.g., 4 bits).

[0181] In addition, the QoS Control field may include both a Queue size field and a Required Target RSSI field, for example, as shown in FIG. 28. Here, the Required Target RSSI is information attached to data transmitted in a P2P link, for example. In other words, for example, when there is no transmission data in the P2P link, the Required Target RSSI does not have to be notified. Therefore, as shown in FIG. 28, by transmitting the Required Target RSSI together with the Queue size, the efficiency of notification from the STA300 to the AP100 can be improved.

[0182] Also, for example, the number of bits for transmitting each of the Queue size and the Required Target RSSI is not limited to the values shown in FIG. 28. For example, as shown in FIG. 28, each of the Queue size and the Required Target RSSI may be 4 bits, may be less than 4 bits, or may be more than 4 bits. Also, for example, the number of bits for transmitting the Queue size and the Required Target RSSI may be different.

[0183] <Format 3> In Format 3, for example, control information for the Required Target RSSI may be defined. In other words, in Format 3, the Required target RSSI may be transmitted in a format different from the format (or control field) defined in 11ax, for example.

[0184] FIG. 29 is a diagram showing an example of set values of Control IDs (for example, information identifying the type of control information) included in a Control subfield within an HT Control field.

[0185] For example, as shown in FIG. 29, a control information format (for example, called TID-based Buffer status report) that notifies BSR and Required Target RSSI similar to Format 1 may be defined for any of the unused Control IDs in 11ax (for example, Control ID = 7). Note that the Control ID for which the Required Target RSSI for the P2P link is defined is not limited to Control ID = 7, and other values may also be used.

[0186] Also, for example, in Format 1 (for example, FIG. 24), the BSR format includes an ACI (access category indicator). On the other hand, in Format 3, for example, a TID may be included. FIG. 30 is a diagram showing an example of the format of the TID-based Buffer status report in Format 3. The format shown in FIG. 30 may include, for example, a TID, a Queue size, and a Required Target RSSI.

[0187] Similar to Format 1, the Required Target RSSI is information attached to the data transmitted in the P2P link, for example. In other words, for example, when there is no transmission data in the P2P link, the Required Target RSSI does not have to be notified. Therefore, like Format 3, by transmitting the Required Target RSSI together with the Queue size from the STA 300 to the AP 100, the STA 300 can improve the efficiency of notification to the AP 100.

[0188] For example, in Format 3, the switching of the TID-based Buffer status report to be transmitted to AP100 among the TID-based Buffer status report for the uplink (e.g., FIG. 31) and the TID-based Buffer status report for the P2P link (e.g., FIG. 30) may be controlled using the TID field. For example, when a value of an unused TID in the uplink (e.g., TID > 7) is set, the TID-based Buffer status report for the P2P link shown in FIG. 30 may be shown, and when a TID used in the uplink (e.g., TID ≦ 7) is set, the TID-based Buffer status report for the uplink shown in FIG. 31 may be shown. Note that the TID-based Buffer status report for the P2P link may include, for example, the Required Target RSSI as shown in FIG. 30. Also, the TID-based Buffer status report for the uplink may not include the Required Target RSSI, for example, as shown in FIG. 31.

[0189] Also, the TID-based Buffer status report may include other fields different from the fields shown in FIGS. 30 and 31. For example, the TID-based Buffer status report may include the Aggregated MAC Service Data Unit (A-MSDU) present field included in the BSR.

[0190] Also, a Trigger type for triggering the TID-based Buffer status report may be set in the control signal (e.g., Trigger frame) notified from AP100 to STA300.

[0191] Also, the format for notifying the Required Target RSSI in Format 3 is not limited to the formats shown in FIGS. 30 and 31. For example, a format that does not include the TID field shown in FIGS. 30 and 31 may be defined.

[0192] <Format 4> In Format 4, for example, similar to Format 3, control information for the Required Target RSSI may be defined. In other words, in Format 4, for example, the Required target RSSI may be transmitted in a format different from the format (or control field) defined in 11ax.

[0193] FIG. 32 is a diagram showing an example of the setting value of the Control ID (for example, information for identifying the type of control information) included in the Control subfield within the HT Control field.

[0194] For example, as shown in FIG. 32, a format of control information for notifying the Required Target RSSI (for example, called Required Target RSSI report (RTRR)) may be defined for any of the Control IDs unused in 11ax (for example, Control ID = 7). Note that the Control ID for which RTRR is defined is not limited to Control ID = 7 and may be other values.

[0195] FIGS. 33, 34, and 35 are diagrams showing an example of the RTRR format.

[0196] The RTRR format shown in FIG. 33 may be a format that includes, for example, a Required Target RSSI field and no other fields. The Required Target RSSI may be, for example, a 7-bit value similar to the UL Target RSSI included in the Trigger frame shown in FIG. 18, or may be other values (e.g., the UL Target RSSI or an offset value with respect to the past Required Target RSSI). Since the RTRR format shown in FIG. 33 does not include other fields different from the Required Target RSSI, the signaling overhead can be reduced.

[0197] The RTRR format shown in FIG. 34 may be a format that includes, for example, a Required Target RSSI field and an MCS field. In the RTRR format, in addition to the Required Target RSSI, the MCS is notified to the AP100, so the AP100 can, for example, more easily adjust the Target RSSI.

[0198] For example, when the MCS notified by the RTRR format is high (e.g., when the MCS is equal to or greater than a threshold value), the AP100 may reduce the Target RSSI set for the P2P link. For example, the AP100 may set a Target RSSI lower than the Required target RSSI. For example, the higher the MCS, the more room there is to reduce the MCS in the STA300. Therefore, when the STA300 is notified of a Target RSSI lower than the Required target RSSI, for example, the STA300 can maintain the reception quality of the P2P link and suppress the transmission power by transmission control such as reducing the MCS for data (e.g., PPDU) transmitted in the P2P link.

[0199] On the other hand, for example, when the MCS notified by the RTRR format is low (for example, when the MCS is less than the threshold), the AP100 does not have to reduce the Target RSSI set for the P2P link. For example, the AP100 may set the Target RSSI to be about the same as the Required target RSSI. For example, since the STA300 is notified of the Target RSSI about the same as the Required target RSSI, it can transmit data (for example, PPDU) in the P2P link without reducing the MCS of the data to be transmitted and suppressing the transmission power.

[0200] Note that in the RTRR format, the Required Target RSSI may be notified for each MCS.

[0201] The format shown in FIG. 35 may be a format including, for example, a Required Target RSSI field and a TID (or, ACI) field. In the RTRR format, when the TID is notified, the AP100 can determine, for example, the urgency of transmission of the P2P link (in other words, the delay tolerance). The AP100 may determine whether to preferentially allocate resources to the P2P link, for example, based on the urgency of transmission of the P2P link.

[0202] Note that a Trigger type for triggering a Required Target RSSI report may be set in a control signal (for example, Trigger frame) notified from the AP100 to the STA300.

[0203] The example of the format of the control information for notifying the Required Target RSSI has been described above.

[0204] In this way, in this embodiment, STA300 transmits parameters related to the P2P link (for example, Required target RSSI) to AP100, and receives information related to Target RSSI determined based on the parameters related to the AP-STA link and the parameters related to the P2P link at AP100. Thereby, STA300 can perform transmission power control of the P2P link based on the state of the P2P link in addition to the state of the AP-STA link, for example. Therefore, according to this embodiment, STA300 can guarantee the quality of the P2P link and suppress interference (for example, Adjacent channel interference) given to AP100 by the transmission of the P2P link by STA300.

[0205] The above describes each embodiment of the present disclosure.

[0206] (Other embodiments) (1) In the above-described embodiment, transmission power control in the P2P link (for example, the link between STA2 and STA3 shown in FIG. 8) has been described. However, an embodiment of the present disclosure is not limited to transmission power control of the P2P link, and may be applied to, for example, a STA-AP link (for example, the link between STA2 and AP#2 shown in FIG. 36). For example, in FIG. 36, when AP#1 instructs uplink transmission to AP#2 of STA2 by a Trigger frame, the method described in at least one of the above-described Embodiment 1 and Embodiment 2 may be applied to transmission power control in the uplink of STA2 (the link between STA2 and AP#2). Thereby, in FIG. 36, interference given by the uplink transmission of STA2 to the reception process of the uplink signal from STA1 at AP#1 can be reduced, and the uplink throughput can be improved.

[0207] In other words, in the above-described embodiment, the transmission of STA2 triggered by the AP is not limited to transmission for P2P, and the same transmission power control method may be applied to transmission to a destination different from the destination addressed to the AP (for example, AP in FIG. 8 or AP#1 in FIG. 36).

[0208] For example, the destination of the uplink transmission of STA2 may be an AP of another BSS (for example, a cooperative AP (not shown) in the case of performing cooperative communication among a plurality of APs). In this case, the Trigger frame may include, for example, "control information for distinguishing whether it is an uplink transmission or a transmission different from the uplink transmission (including, for example, P2P)" instead of the "control information for distinguishing whether it is an uplink transmission or a P2P link transmission" described in the first embodiment.

[0209] Further, as a variation of the transmission instruction method by the Trigger frame, for example, any transmission including uplink transmission may be permitted. In other words, the specified STA may execute any communication (for example, P2P communication) within the TXOP following the Trigger frame. In this case, the control information within the Trigger frame may be, for example, control information for distinguishing "whether to limit to uplink transmission or permit other transmissions different from uplink transmission". The STA that has received the Trigger frame may interpret the meaning of the Target RSSI of the Trigger frame according to the type of transmission and perform transmission power control. For example, when performing an uplink transmission toward the AP that has transmitted the Trigger frame, the transmission power control method defined in 11ax may be applied, and when performing a transmission different from the uplink transmission (including, for example, a P2P link transmission), the transmission power control method described in the above embodiment may be applied.

[0210] (2) In the above embodiment, the transmission power control method for P2P link transmission indicated by the Trigger frame has been described. However, the method for controlling the transmission power of the P2P link is not limited to the method based on the Trigger frame. For example, one embodiment of the present disclosure is applicable to P2P link transmission triggered by other control information (Control frame or Management frame) transmitted from the AP100. As an example of the control information, Triggered response scheduling (TRS) Control (hereinafter referred to as TRS) can be mentioned. FIG. 37 is a diagram showing an example of the format of TRS. As shown in FIG. 37, the TRS includes an AP TX Power field and a UL Target RSSI field, similar to the Trigger frame. Therefore, even in the case of TRS, the same transmission power control as the Trigger frame is possible.

[0211] (3) In the above embodiment, for example, a method of controlling the transmission power of the P2P link by regarding the Target RSSI included in the Trigger frame as the allowable interference amount at the AP100 has been described. The transmission power control of the P2P link may be based on, for example, the set value of the UL spatial Reuse field included in the Trigger frame instead of the Target RSSI. For example, when applying UL spatial Reuse to the transmission power control of the P2P link, the STA may perform transmission power control so that, for example, the interference power based on the Adjacent channel interference is equal to or less than the allowable interference amount defined by the UL spatial Reuse.

[0212] Also, in the above embodiment, as an example, a configuration example based on the format of the 11ax control signal has been described. However, the format to which one embodiment of the present disclosure is applied is not limited to the 11ax format.

[0213] Also, the formats shown in the above embodiments are merely examples, and the present disclosure is not limited thereto. For example, some of the fields and sub-fields included in the formats shown in the above embodiments may be omitted, fields and sub-fields for notifying other information may be added, or the order of the fields and sub-fields may be changed. Also, the terms "field" and "sub-field" may be read interchangeably with each other.

[0214] Also, the names of the information and fields shown in the above embodiments are merely examples, and the present disclosure is not limited thereto.

[0215] Also, in the above embodiments, the uplink communication has been described, but the present disclosure is not limited thereto and may be applied to downlink communication.

[0216] Also, the notation "··· part" in the above embodiments may be replaced with other notations such as "··· circuitry", "··· device", "··· unit", or "··· module".

[0217] The present disclosure can be implemented by software, hardware, or software in cooperation with hardware. Each functional block used in the description of the above embodiments may be realized, partially or entirely, as an LSI which is an integrated circuit, and each process described in the above embodiments may be controlled, partially or entirely, by one LSI or a combination of LSIs. The LSI may be composed of individual chips, or may be composed of one chip so as to include part or all of the functional blocks. The LSI may have data input and output. Depending on the degree of integration, the LSI may also be referred to as an IC, a system LSI, a super LSI, or an ultra LSI. The method of integrating into an integrated circuit is not limited to LSI, and may be realized by a dedicated circuit, a general-purpose processor, or a dedicated processor. Also, after manufacturing the LSI, an FPGA (Field Programmable Gate Array) that can be programmed, or a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used. The present disclosure may be realized as digital processing or analog processing. Furthermore, if an integrated circuit technology that replaces the LSI appears due to the progress of semiconductor technology or another derived technology, of course, the integration of functional blocks may be performed using that technology. The application of biotechnology and the like are possible as possibilities.

[0218] The present disclosure can be implemented in any type of apparatus, device, system having a communication function (collectively referred to as a communication device). The communication device may include a wireless transceiver (transceiver) and a processing / control circuit. The wireless transceiver may include a receiving unit and a transmitting unit, or may include them as functions. The wireless transceiver (transmitting unit, receiving unit) may include an RF (Radio Frequency) module and one or more antennas. The RF module may include an amplifier, an RF modulator / demodulator, or the like. Non-limiting examples of the communication device include a telephone (mobile phone, smartphone, etc.), a tablet, a personal computer (PC) (laptop, desktop, notebook, etc.), a camera (digital still / video camera, etc.), a digital player (digital audio / video player, etc.), a wearable device (wearable camera, smartwatch, tracking device, etc.), a game console, a digital book reader, a telehealth / telemedicine (remote healthcare / medical prescription) device, a vehicle or mobile transportation means with a communication function (automobile, airplane, ship, etc.), and combinations of the above various devices.

[0219] The communication device is not limited to portable or mobile ones, and includes any type of apparatus, device, system that is not portable or fixed, for example, smart home devices (home appliances, lighting devices, smart meters or measuring devices, control panels, etc.), vending machines, and any "Things" that can exist on the IoT (Internet of Things) network.

[0220] Communication includes data communication by a cellular system, a wireless LAN system, a communication satellite system, etc., as well as data communication by combinations thereof.

[0221] In addition, the communication device also includes devices such as a controller and a sensor that are connected or coupled to a communication device that executes the communication function described in the present disclosure. For example, a controller and a sensor that generate control signals and data signals used by the communication device that executes the communication function of the communication device are included.

[0222] In addition, the communication device includes infrastructure facilities that communicate with or control the above-described various non-limiting devices, such as base stations, access points, and any other devices, devices, and systems.

[0223] A terminal according to an embodiment of the present disclosure includes a control circuit that performs transmission power control of a second link with respect to another terminal based on parameters related to a first link with respect to an access point, and a transmission circuit that transmits a signal on the second link according to the transmission power control.

[0224] In an embodiment of the present disclosure, the parameter indicates the quality of the first link.

[0225] In an embodiment of the present disclosure, The terminal further includes a receiving circuit that receives information related to a target reception signal strength of the signal at the access point and information related to a transmission power of the access point, and the control circuit performs the transmission power control based on the target reception signal strength and the transmission power of the access point.

[0226] In an embodiment of the present disclosure, the control circuit performs the transmission power control based on parameters related to beamforming of the signal.

[0227] In an embodiment of the present disclosure, the receiving circuit receives information related to the target reception signal strength for each priority with respect to transmission of the second link.

[0228] In one embodiment of the present disclosure, the priority is determined based on at least one of an access category, a traffic type, and a frame type.

[0229] In one embodiment of the present disclosure, the receiving circuit receives information regarding the target received signal strength in a modulation and coding scheme (MCS) field within a terminal-specific information field.

[0230] In one embodiment of the present disclosure, the control circuit switches between the transmission power control based on the parameters related to the first link and the transmission power control based on the parameters related to the second link based on the instruction information.

[0231] In one embodiment of the present disclosure, it further comprises a receiving circuit that receives the instruction information in a Trigger frame, a beacon, or control information.

[0232] In one embodiment of the present disclosure, it further comprises a transmission circuit that transmits the parameters related to the second link to the access point, and the receiving circuit receives information regarding the target received signal strength determined based on the parameters related to the first link and the parameters related to the second link.

[0233] In one embodiment of the present disclosure, the parameters related to the second link include the target received signal strength of the signal set by the terminal.

[0234] In one embodiment of the present disclosure, the transmission circuit transmits the parameters related to the second link in a control field related to a buffer status report.

[0235] In one embodiment of the present disclosure, the transmission circuit transmits the parameters related to the second link in a control field related to service quality.

[0236] In one embodiment of the present disclosure, parameters related to the second link are transmitted in a control field different from the fields defined in IEEE 802.11ax.

[0237] In one embodiment of the present disclosure, the control field includes information related to traffic types.

[0238] In one embodiment of the present disclosure, the transmission circuit switches between a signal format including the target received signal strength and a signal format not including the target received signal strength based on information related to traffic types.

[0239] In a communication method according to one embodiment of the present disclosure, a terminal performs transmission power control of a second link with respect to another terminal based on parameters related to a first link with respect to an access point, and transmits a signal on the second link according to the transmission power control.

[0240] The disclosures of the specification, drawings, and abstracts included in Japanese Patent Application No. 2020-122948 filed on July 17, 2020 are all incorporated herein by reference.

Industrial Applicability

[0241] One embodiment of the present disclosure is useful for wireless communication systems.

Explanation of Signs

[0242] 100 AP 101 Scheduler unit 102 Control signal generation unit 103, 206 Transmission signal generation unit 104, 201 Wireless transceiver unit 105, 202 Received signal demodulation / decoding unit 200, 300 STA 203 Transmission power calculation unit 204 Signal generation unit 205 Transmission control unit 301 Required target RSSI calculation unit

Claims

1. A first communication device, a receiver for receiving control information relating to a transmission power limit from a second communication device; a circuit for determining a transmission power based on the control information; a transmitter that transmits a physical layer protocol data unit (PPDU) based on the transmit power; A first communication device comprising:

2. The control information is included in a trigger frame. The first communication device according to claim 1 .

3. The control information is included in a User Info field of the trigger frame. The first communication device according to claim 2 .

4. The receiver receives the control information in a terminal individual information field. The first communication device according to claim 1 .

5. The trigger frame includes at least one of time and frequency resource information, a transmission power control parameter of the second communication device, information regarding transmission signal generation, a trigger type notifying a type of control signal, and terminal identification information. The first communication device according to claim 2 .

6. The method of claim 1, wherein the transmit power is determined by the transmit power limit and the transmit power control parameter. The first communication device according to claim 5 .

7. The method of claim 6, wherein the transmit power limit is determined by a Target Received Signal Strength Indicator (RSSI) at the second communication device. The first communication device according to claim 1 .

8. The transmission power is controlled based on parameters related to beamforming in the first communication device. The first communication device according to claim 1 .

9. The transmission power is determined so that the transmission power is equal to or less than the transmission power limit. The first communication device according to claim 1 .

10. The method of claim 1, wherein the PPDU is transmitted to a third communication device based on the transmission power. The first communication device according to claim 1 .

11. The first communication device comprises: receiving control information relating to a transmission power limit from a second communication device; determining a transmission power based on the control information; transmitting a physical layer protocol data unit (PPDU) based on the transmit power; Communication method.

12. The control information is included in a trigger frame. The communication method according to claim 11.

13. The control information is included in a User Info field of the trigger frame. The communication method according to claim 12.

14. receiving the control information in a terminal individual information field; The communication method according to claim 11.

15. The trigger frame includes at least one of time and frequency resource information, a transmission power control parameter of the second communication device, information regarding transmission signal generation, a trigger type indicating the type of control signal, and terminal identification information. The communication method according to claim 12.

16. The method of claim 15, wherein the transmit power is determined by the transmit power limit and the transmit power control parameter. The communication method according to claim 15.

17. The method of claim 16, wherein the transmit power limit is determined by a Target Received Signal Strength Indicator (RSSI) at the second communication device. The communication method according to claim 11.

18. The method of claim 17, wherein the transmission power is controlled based on a parameter related to beamforming in the first communication device. The communication method according to claim 11.

19. The method of claim 18, wherein the transmission power is determined so that the transmission power is equal to or less than the transmission power limit. The communication method according to claim 11.

20. The method of claim 1, wherein the PPDU is transmitted to a third communication device based on the transmission power. The communication method according to claim 11.

21. An integrated circuit for a first communication device, comprising: a receiving circuit for controlling reception of control information relating to a transmission power limit from the second communication device; a determination circuit for controlling determination of transmission power based on the control information; a transmitting circuit for controlling transmission of a physical layer protocol data unit (PPDU) based on the transmit power; An integrated circuit comprising:

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