Terminal and communication method

Abstract

The present invention suppresses interference of inter-terminal communication to an access point. A terminal includes a control circuit that performs transmission power control in a second link with another terminal based on a parameter regarding a state of a first link with an access point, and a transmission circuit that transmits a signal according to the transmission power control.

Description

Technical Field

[0001] This disclosure relates to terminals and communication methods. Background Technology

[0002] As a successor to the IEEE 802.11 standard, namely IEEE 802.11ax (hereinafter referred to as "11ax"), the technical specifications for IEEE 802.11be (hereinafter referred to as "11be") are being planned.

[0003] For example, in 11be, a method for triggering communication between a terminal (hereinafter referred to as "STA" or "Station") and another terminal (e.g., "inter-terminal communication", "peer-to-peer (P2P)" or "direct link (DiL)") by an access point (also referred to as "base station" or "AP") was studied (e.g., triggered P2P) (see, for example, Non-Patent Literature 1 to Non-Patent Literature 5).

[0004] Existing technical documents

[0005] Non-patent literature

[0006] Non-patent literature 1: IEEE 802.11-19 / 1604r1, Triggered P2P

[0007] Non-patent document 2: IEEE 802.11-20 / 0095r1, Triggered P2P transmissions

[0008] Non-patent document 3: IEEE 802.11-19 / 1117r2, Direct Link MU transmissions

[0009] Non-patent document 4: IEEE 802.11-20 / 0813r0, Triggered P2P transmissions followup

[0010] Non-patent document 5: IEEE 802.11-20 / 0871r1, Triggered P2P for 11be Release 1 Non-patent document 6: IEEE P802.11ax / D6.0, November 2019

[0011] Non-patent document 7: IEEE 802.11-2016, December 2016 Summary of the Invention

[0012] However, methods for suppressing interference from inter-terminal communication to access points have not been fully studied.

[0013] The non-limiting embodiments disclosed herein help to provide terminals and communication methods that suppress interference of inter-terminal communication on access points.

[0014] One embodiment of the present disclosure includes a terminal comprising: a control circuit that performs transmit power control for a second link to other terminals based on parameters related to a first link to an access point; and a transmit circuit that transmits a signal in the second link according to the transmit power control.

[0015] It should be noted that these general or specific methods can be implemented by systems, devices, methods, integrated circuits, computer programs or recording media, or by any combination of systems, devices, methods, integrated circuits, computer programs and recording media.

[0016] According to one embodiment of this disclosure, interference from inter-terminal communication to the access point can be suppressed.

[0017] Further advantages and effects of one embodiment of the present invention will be illustrated by the description and drawings. These advantages and / or effects are provided by the various embodiments and the features described in the description and drawings, but not necessarily all of them need to be provided in order to obtain one or more of the same features. Attached Figure Description

[0018] Figure 1 This is a diagram illustrating an example of the format of a Common Info field.

[0019] Figure 2 This is a diagram illustrating an example of the format of a User Info field.

[0020] Figure 3 This is a diagram illustrating an example of the format of a Medium Access Control (MAC) frame.

[0021] Figure 4 This is a diagram representing an example of a frame control field.

[0022] Figure 5 This is a diagram illustrating an example of a setting value in a frame control field.

[0023] Figure 6 This is a diagram showing an example of the settings in the Quality of Service (QoS) Control field.

[0024] Figure 7 This is a diagram showing an example of the settings in the Control ID subfield.

[0025] Figure 8 This is a diagram illustrating an example of the structure of a wireless communication system.

[0026] Figure 9 This is a diagram illustrating an example of the received power in an AP.

[0027] Figure 10 This is a sequence diagram illustrating an example of the transmission process in a wireless communication system.

[0028] Figure 11 This is a block diagram representing a structural example of a part of STA.

[0029] Figure 12 This is a block diagram representing a structural example of AP.

[0030] Figure 13 This is a block diagram representing a structural example of STA.

[0031] Figure 14 This is a diagram illustrating an example of a target received signal strength indicator (RSSI).

[0032] Figure 15 This is a diagram illustrating an example of the format of a public information field.

[0033] Figure 16 This is a diagram illustrating an example of the format of a user information field.

[0034] Figure 17 This is a diagram illustrating an example of the format of a user information field.

[0035] Figure 18 This is a diagram showing an example of the setting value in the UL Target RSSI subfield of the uplink.

[0036] Figure 19 This is a diagram representing an example of priority.

[0037] Figure 20 This is a diagram representing an example of priority.

[0038] Figure 21 This is a diagram representing an example of priority.

[0039] Figure 22 This is a diagram representing an example of priority.

[0040] Figure 23 This is a block diagram representing a structural example of STA.

[0041] Figure 24 This is a diagram illustrating an example of the format of a Buffer Status Report (BSR).

[0042] Figure 25 This is a sequence diagram illustrating an example of the transmission process in a wireless communication system.

[0043] Figure 26 This is a sequence diagram illustrating an example of the transmission process in a wireless communication system.

[0044] Figure 27 This is a diagram illustrating an example of the format of a QoS control field.

[0045] Figure 28 This is a diagram illustrating an example of the format of a QoS control field.

[0046] Figure 29 This is a diagram illustrating an example of the set value in the control identifier subfield.

[0047] Figure 30 This is a diagram illustrating an example of a Traffic Identify (TID)-based BSR format.

[0048] Figure 31 This is a diagram illustrating an example of a TID-based BSR format.

[0049] Figure 32 This is a diagram illustrating an example of the set value in the control identifier subfield.

[0050] Figure 33 This is a diagram illustrating an example of the Required Target RSSIreport (RTRR) format.

[0051] Figure 34 This is a diagram illustrating an example of the RTRR format.

[0052] Figure 35 This is a diagram illustrating an example of the RTRR format.

[0053] Figure 36 This is a diagram illustrating an example of the structure of a wireless communication system.

[0054] Figure 37 This is a diagram illustrating an example of a format that represents a triggered response scheduling. Detailed Implementation

[0055] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0056] [The 11ax sending process]

[0057] For example, 11ax supports multi-user (MU) transmission in the uplink (UL). UL MU transmission includes, for example, MU-MIMO (Multiple Input Multiple Output) and OFDMA (Orthogonal Frequency Division Multiple Access). During UL MU transmission in 11ax, an AP can, for example, send a signal (e.g., called a "trigger frame") to multiple STAs it accommodates, acting as a trigger for uplink signals. A terminal can, for example, send an uplink signal (e.g., called an "uplink response signal") to the AP based on the trigger frame. Furthermore, the uplink response signal is also referred to as a "trigger-based physical layer convergence procedure Protocol Data Unit (TB PPDU)".

[0058] When sending an uplink response signal, for example, uplink transmit power control can be applied to the STA. For example, it can be used... Figure 1 The set value of the "Access Point Transmit Power (AP TX Power)" field, which is related to the transmit power of the AP in the downlink (DL), is included in the common information field within the trigger frame shown. Figure 2 The uplink transmit power control is calculated according to the following equations (1) and (2) based on the setting value of the "Uplink Target RSSI (UL Target RSSI)" field in the user information field of the trigger frame shown, which is related to the target received signal strength (e.g., Target Received Signal Strength Indicator (RSSI)) of the AP in the uplink (e.g., see Non-Patent Document 6).

[0059] Furthermore, the target received signal strength (target RSSI) is sometimes also referred to as the "target received power". Additionally, the common information field may contain information common to multiple STAs (e.g., also called "general information" or "STA general information"). Furthermore, the user information field may contain information specific to each STA (e.g., called "user information", "STA specific information", or "user specific information").

[0060] [Equation (1)]

[0061]

[0062] [Equation (2)]

[0063]

[0064] In equations (1) and (2), PL DL Tx represents the path loss ([dBm]) in the downlink. pwr AP This indicates the set value of the access point transmit power field (e.g., transmit power value) ([dBm]), DL RSSI This represents the received strength (e.g., RSSI) of the downlink signal estimated (or measured) by the STA (dBm). RSSI This indicates the setting value ([dBm]) of the uplink target RSSI field.

[0065] Figure 3 This is a diagram illustrating an example of the format of a Media Access Control (MAC) frame in 11ax (see, for example, Non-Patent Documents 6 and 7). A MAC frame may include, for example, a "FrameControl" field, a "Quality of Service (QoS) Control" field, and a "High Throughput (HT) Control" field.

[0066] Figure 4 This is a diagram illustrating an example of the frame control field within a MAC frame. Additionally, Figure 5 This is a diagram illustrating an example of the settings for frame control fields (e.g., type value and subtype value).

[0067] exist Figure 5In, for example, when the value of the Type field in the frame control field is "Data" (e.g., the field value is "10"), and bit #7 (B7) of the SubType field is "1" ( Figure 5 The QoS Control field within a MAC frame is 2 bytes in size (the area enclosed by the dashed line in the frame). On the other hand, if the type is different from the combination of the type field value being "data" and the subtype field value having bit #7 (B7) being "1", the QoS Control field is 0 bytes in size.

[0068] Figure 6 This is a diagram illustrating an example of the parameters represented by the bits (e.g., bits 0-15) of the QoS control field within a MAC frame. Figure 6 As shown, the QoS control field may contain parameters such as "Traffic Identifier (TID)" which indicates the type of traffic owned, or "Queue Size" which indicates the amount of traffic owned (e.g., queue size).

[0069] Additionally, in the HT Control field within the MAC frame, for example, it can be like... Figure 3 As shown, it contains one or more control subfields. Additionally, control subfields may contain, for example, a control ID that identifies the category of control information. Figure 7 This is a diagram illustrating an example of the setting value for the control ID. For example... Figure 7 As shown, STA can use the control ID to distinguish the category of control information.

[0070] [P2P triggered]

[0071] In a triggered P2P, similar to UL MU transmission in 11ax, the AP can send a control signal (e.g., a trigger frame) to the terminal that has started transmitting using P2P (e.g., a "Direct Link Scheduled (DLS) STA"), which acts as a trigger for the P2P signal. The trigger frame may contain information related to resources used for P2P link transmission. After receiving the trigger frame, the terminal may, for example, transmit data to the STA (e.g., a "Direct Link Peer (DLP) STA") on the P2P link (or, referred to as a "Direct Link").

[0072] In addition, for P2P that has been triggered, methods for dividing uplink resources (e.g., referred to as "uplink resources") and P2P resources (e.g., referred to as "P2P resources") indicated by the triggering frame in the time domain (referred to as "time resource sharing") and methods for dividing uplink resources and P2P resources in the frequency domain (referred to as "frequency resource sharing") have been studied.

[0073] However, the control methods for transmission power that has been triggered by P2P have not been fully studied.

[0074] Therefore, in one embodiment of this disclosure, a method for appropriately controlling the transmission power of a signal that has triggered P2P is described, for example.

[0075] For example, one approach is to avoid performing interference-related control of the AP based on P2P link information in the transmission control (e.g., transmission power control) of the P2P link. If this method of P2P link transmission control is adopted, interference may occur when P2P resources and uplink resources are frequency-multiplexed. For example, in AP reception, if a large power difference (e.g., a power difference exceeding a threshold) exists between the received power of the uplink signal and the received power of the P2P link signal, interference may occur between adjacent frequency bands (e.g., also known as "adjacent channel interference" or "inter-RU interference").

[0076] Figure 8 This illustrates an example of the structure of a wireless communication system. Additionally, Figure 9 express Figure 8 An example of the received power in the AP of the wireless communication system shown.

[0077] exist Figure 8 In this context, for example, the AP can use a trigger frame (e.g., denoted as "TF") to trigger STA1 to perform uplink transmission (e.g., communication between STA1 and the AP). Additionally, in... Figure 8 In this context, for example, the AP can use a trigger frame to trigger STA2 to send P2P link messages (e.g., communication between STA2 and STA3).

[0078] like Figure 8 As shown, in the case of both uplink transmission triggered by a trigger frame and P2P link transmission, the P2P link transmission of STA2 may interfere with the AP. For example, as Figure 9 As shown, for an AP, when the received power of the signal from the P2P link (e.g., STA2-STA3 communication) is greater than the received power of the signal from the uplink (e.g., STA1-AP communication), the uplink signal reception performance may be degraded due to interference (e.g., adjacent channel interference).

[0079] Figure 10 This is a sequence diagram representing an example of uplink transmission and P2P link transmission.

[0080] like Figure 10 As shown, for example, an AP can send a trigger frame after acquiring time resources (e.g., a transmission opportunity (TXOP)).

[0081] Additionally, the STA that receives the trigger frame (e.g., Figure 10 STA#1 and STA#2 can transmit uplink (e.g., STA#1-AP) signals (e.g., TB-PPDU) or P2P link (e.g., STA2-STA3) signals (e.g., P2P-PPDU) after a specified time (e.g., Short Inter Frame Space (SIFS)) has elapsed since the trigger frame was received. Furthermore, the P2P-PPDU can be any PPDU, such as a single-user (SU) PPDU, a multi-user (MU) PPDU, or a trigger-based (TB) PPDU.

[0082] exist Figure 10 In this context, STA#3 (e.g., DLP STA) or AP may, for example, send an acknowledgment signal (e.g., ACK) after passing through SIFS from the time the PPDU is received. For example, as... Figure 10 As shown, the transmission processing of the P2P link indicated by the trigger frame can be performed within the TXOP acquired by the AP. Furthermore, in Figure 10 In this context, STA2 and STA3 can be the same BSS (Basic Service Set) or different BSSs.

[0083] In one embodiment of this disclosure, for example, a method is described in which, when uplink transmission indicated by a trigger frame and P2P link transmission are subject to frequency reuse, interference caused by P2P link transmission to uplink reception processing in the AP is reduced by appropriately controlling the transmission power of the P2P link.

[0084] According to this method, for example, it is possible to reduce the interference caused by P2P link transmission to the uplink reception processing in the AP, and thus improve the uplink throughput.

[0085] (Implementation Method 1)

[0086] [Structure of a wireless communication system]

[0087] The wireless communication system of this embodiment may include, for example, AP100 and STA200.

[0088] For example, in this embodiment, AP100 may use a trigger frame to notify STA200 of information related to transmission control of at least one of the uplink and P2P links. "Notification" may also be replaced with "transmission" or "instruction". STA200 may, for example, perform at least one of uplink transmission and P2P link transmission based on the trigger frame notified by AP100.

[0089] The following describes a structural example of AP100 and STA200 in this embodiment.

[0090] Figure 11 This is a block diagram illustrating a structural example of a STA200 according to an embodiment of the present disclosure. Figure 11 In the STA200 shown, the control unit (e.g., equivalent to a control circuit) performs transmit power control on the second links (e.g., STA-STA links or DiL) of other STAs based on parameters related to the first link (e.g., AP-STA link) for AP100. The transmitting unit (e.g., equivalent to a transmitting circuit) transmits signals in the second link according to the transmit power control.

[0091] [Structure example of AP100]

[0092] Figure 12 This is a block diagram representing a structural example of AP100. Figure 12 The AP100 shown may include, for example, a scheduler unit 101, a control signal generation unit 102, a transmission signal generation unit 103, a wireless transceiver unit 104, and a received signal demodulation / decoding unit 105.

[0093] For example, the scheduler unit 101 and the control signal generation unit 102 may be included in the access control unit (e.g., the MAC processing unit), and the transmit signal generation unit 103 and the receive signal demodulation / decoding unit 105 may be included in the baseband (BB) processing unit.

[0094] The scheduler unit 101 can, for example, control the scheduling of STA 200. For instance, the scheduler unit 101 can determine scheduling information such as resource allocation and modulation and coding scheme (MCS) for each STA 200 based on information input from the received signal demodulation / decoding unit 105 (e.g., feedback information). Furthermore, the scheduler unit 101 can, for instance, determine parameters related to uplink or P2P link transmission power control (e.g., transmission power control parameters), such as the transmit power of AP 100 and the target RSSI. The scheduler unit 101 can, for instance, output control information containing the determined scheduling information or transmission power control parameters to the control signal generation unit 102. Furthermore, examples of methods for setting transmission power control parameters (e.g., target RSSI) for P2P links will be described later.

[0095] The control signal generation unit 102 may generate control signals (e.g., trigger frames) for the STA 200. For example, the control signal generation unit 102 may generate control signals based on control information input from the scheduler unit 101 (e.g., resource allocation results for each STA 200, or transmit power control parameters).

[0096] The control signal may include, for example, at least one of the following: time and frequency resource information (e.g., resource unit (RU) allocation information, TXOP, length, etc.), transmit power control parameters (e.g., transmit power of AP100 or target RSSI, etc.), information related to the generation of transmit signals of the uplink or P2P link (e.g., MCS, guard interval (GI), long training field (LTF) mode, etc.), trigger type of notification control signal category, and terminal identification information (e.g., association ID (AID)).

[0097] Furthermore, information related to the generation of transmission signals in the P2P link (e.g., MCS, GI, LTF mode, etc.) is not limited to being determined (or indicated) by the AP100; for example, it can also be determined by the DLS STA. In this case, information such as MCS, GI, and LTF mode may not be notified by the AP100. Additionally, examples of trigger frame formats used for P2P links will be described later.

[0098] The control signal generation unit 102 outputs the generated control signal to the transmission signal generation unit 103, for example.

[0099] The transmit signal generation unit 103 encodes and modulates control signals, data, and ACK / block-ACK responses input from the control signal generation unit 102, for example. The transmit signal generation unit 103 may add pilot signals for frequency or timing synchronization at the receiving side (e.g., STA200), channel estimation signals (e.g., LTF or Extremely High Throughput (EHT)-LTF), etc., to the modulated signal, and generate a radio frame (transmit signal). The transmit signal generation unit 103 outputs the generated transmit signal to the radio transceiver unit 104.

[0100] The wireless transceiver unit 104 performs wireless transmission processing on the transmission signal input from the transmission signal generation unit 103, such as D / A (Digital / Analog) conversion and up-conversion to the carrier frequency, and transmits the processed signal via an antenna.

[0101] AP100 can operate as follows when receiving uplink signals (e.g., uplink response signals (TB-PPDU)) and feedback information sent from STA200.

[0102] The wireless signal received via the antenna is input to the wireless transceiver unit 104. The wireless transceiver unit 104 performs wireless reception processing on the received wireless signal, such as down-converting the carrier frequency, and outputs the wirelessly received signal to the received signal demodulation / decoding unit 105.

[0103] The received signal demodulation / decoding unit 105 can, for example, perform autocorrelation processing on the signal input from the wireless transceiver unit 104 and extract the received wireless frames. Furthermore, the received signal demodulation / decoding unit 105 can, for example, decode and demodulate the uplink response signal (e.g., TB-PPDU) and feedback information from the STA 200 contained in the extracted wireless frames. The received signal demodulation / decoding unit 105 can, for example, output feedback information to the scheduler unit 101.

[0104] [Structure example of STA200]

[0105] Figure 13 This is a block diagram illustrating a structural example of the STA200 in this embodiment. Figure 13 The STA200 shown may include, for example, a wireless transceiver unit 201, a received signal demodulation / decoding unit 202, a transmit power calculation unit 203, a signal generation unit 204, a transmit control unit 205, and a transmit signal generation unit 206.

[0106] For example, Figure 11 The control unit shown can correspond to Figure 13 The processing units related to the generation of the transmitted signal include (e.g., the received signal demodulation / decoding unit 202, the transmitted power calculation unit 203, the signal generation unit 204, the transmitted control unit 205, and the transmitted signal generation unit 206). Additionally, Figure 11 The transmitting unit shown can, for example, correspond to Figure 13 The wireless transceiver unit 201 shown is shown.

[0107] Alternatively, for example, the transmit power calculation unit 203, the signal generation unit 204, and the transmit control unit 205 may be included in the access control unit, and the receive signal demodulation / decoding unit 202 and the transmit signal generation unit 206 may be included in the baseband processing unit.

[0108] The wireless transceiver unit 201 receives signals transmitted from the AP100 or other STA200 via an antenna, performs wireless reception processing on the received signals such as down-conversion and A / D (Analog / Digital) conversion, and outputs the processed signal to the received signal demodulation / decoding unit 202. Alternatively, the wireless transceiver unit 201 can perform wireless transmission processing on the signal input from the transmission signal generation unit 206, such as D / A conversion and up-conversion to a carrier frequency. Furthermore, the wireless transceiver unit 201 can transmit the processed signal via an antenna based on the transmission power indicated by the transmission power calculation unit 203.

[0109] The received signal demodulation / decoding unit 202 can, for example, perform autocorrelation processing on the signal input from the wireless transceiver unit 201 and extract the received wireless frames. The received signal demodulation / decoding unit 202 can, for example, demodulate and decode the control signals (e.g., trigger frames) contained in the extracted wireless frames and output transmission power control parameters such as access point transmission power or target RSSI to the transmission power calculation unit 203.

[0110] For example, if the extracted radio frame is a signal from another STA 200, the receiving signal demodulation / decoding unit 202 can demodulate and decode the data, control signals, and feedback information contained in the radio frame. The receiving signal demodulation / decoding unit 202 can, for example, output the extracted feedback information to the transmitting control unit 205.

[0111] Furthermore, the STA200 can, for example, determine, based on the control information contained in the trigger frame, whether the transmission indicated by the trigger frame is an uplink transmission or a P2P link transmission. The control information contained in the trigger frame can, for example, be a 1-bit signaling that distinguishes between uplink transmission and P2P link transmission (e.g., see Non-Patent Document 4).

[0112] Alternatively, instead of the aforementioned 1-bit signaling, the STA200 can also distinguish between uplink transmissions and P2P link transmissions based on AIDs. In the AID-based judgment scenario, the STA200 can, for example, have two AIDs: one for uplink communication and one for P2P link communication. By differentiating uplink and P2P link transmissions based on AIDs, control can be implemented without adding any new signaling.

[0113] Alternatively, instead of the aforementioned 1-bit signaling, STA200 can also determine the difference between uplink transmission and P2P link transmission based on unused settings (e.g., 15) in the MCS field of the trigger frame. In the case of P2P link transmission, the MCS can be determined by the DLS STA rather than by AP100. Therefore, STA200 can determine which link transmission, uplink transmission or P2P link transmission, is being indicated by the trigger frame based on the setting value of the MCS field that is not used in the uplink communication trigger frame, within the MCS field that is not used in P2P link transmission. In this way, by differentiating between uplink transmission and P2P link transmission based on the setting value of the MCS field, control can be implemented without additional signaling. Furthermore, the aforementioned signaling for differentiating between uplink transmission and P2P transmission is not limited to notification by unused settings in the MCS field; it can also be notified by unused settings in other fields.

[0114] In addition, the receiving signal demodulation / decoding unit 202 may output time and frequency resource information (e.g., RU allocation information, TXOP, length, etc.) or control parameters such as MCS, GI, LTF mode to the transmitting signal generation unit 206.

[0115] For example, the transmit power calculation unit 203 may calculate the transmit power of the uplink signal (e.g., uplink response signal) or the P2P signal. For instance, the transmit power calculation unit 203 may calculate the transmit power of the uplink response signal or the P2P signal based on transmit power control parameters (e.g., access point transmit power and target RSSI) input from the receive signal demodulation / decoding unit 202, and the path loss estimated based on the downlink signal (not shown). The transmit power calculation unit 203 may, for example, output information related to the calculated transmit power to the wireless transceiver unit 201. Furthermore, examples of methods for calculating the transmit power for P2P link transmission in the transmit power calculation unit 203 will be described later. "Calculate" can also be replaced with "determine".

[0116] The signal generation unit 204 may generate, for example, an uplink response signal or a P2P signal, and output the generated uplink response signal or P2P signal to the transmission signal generation unit 206. The uplink response signal may include, for example, the STA 200's ID and the STA 200's transmission information (e.g., data, transmission buffer status notification (e.g., BSR: buffer status report) or downlink data (DL Data) request, etc.).

[0117] The transmission control unit 205 may, for example, determine control parameters related to the transmission of the P2P link, such as MCS, GI, or LTF modes, based on feedback information from other STAs 200 input from the received signal demodulation / decoding unit 202, and output the determined control parameters to the transmission signal generation unit 206.

[0118] The transmit signal generation unit 206 can, for example, encode and modulate the uplink response signal or the P2P signal input from the signal generation unit 204 based on control parameters (e.g., MCS, GI, LTF mode, etc.) input from the receive signal demodulation / decoding unit 202 or control parameters input from the transmit control unit 205. The transmit signal generation unit 206 can, for example, add control signals (preambles) such as pilot signals for frequency synchronization or timing synchronization at the receiving side (e.g., AP100 or other STA200), and channel estimation signals to the modulated signal, and generate a radio frame (transmit signal). The transmit signal generation unit 206 outputs the generated transmit signal to the radio transceiver unit 201.

[0119] [Examples of AP and STA actions]

[0120] Next, an example of the operation of AP100 and STA200 in this embodiment will be described.

[0121] In this embodiment, STA200 (e.g., DLS STA) can perform P2P link transmit power control based on parameters (e.g., path loss) related to the link between AP100 and STA200 (e.g., AP-STA link or uplink). Parameters related to the AP-STA link can be, for example, parameters representing the quality (or state) of the AP-STA link.

[0122] Additionally, for example, for STA200 acting as a DLS STA, AP100 can send information related to AP100's transmit power and information related to the target RSSI of the P2P link (e.g., the target received signal strength of the signal from the DLS STA in AP100). STA200 can, for example, perform transmit power control of the P2P link based on AP100's transmit power, the target RSSI of the P2P link, and the path loss in the link between AP100 and STA200.

[0123] For example, the AP100 can set the target RSSI of the P2P link based on the target RSSI set for the uplink resources. Figure 14 This is a diagram illustrating an example of the target RSSI setting for a P2P link.

[0124] exist Figure 14 In the example shown, the frequency resources (e.g., RUs) allocated to the P2P link (or STA-STA link) are adjacent to the frequency resources allocated to the uplink (or AP-STA link). In this case, the AP100 can, for example, determine the target RSSI of the P2P resource based on the target RSSI set for the uplink resource adjacent to the P2P resource. For example, the AP100 can set one of the minimum, maximum, and average values ​​of the target RSSI of the uplink resource adjacent to the P2P resource as the target RSSI of the P2P resource.

[0125] By setting the target RSSI of the P2P link, for example, the received power of the potentially interfering P2P link signal in the AP100 can easily reach the same level as the received power of the uplink signal in the AP100. Therefore, the difference in received power between the P2P link signal and the uplink signal in the AP100 is reduced, thus reducing the interference of the P2P link signal on the uplink signal.

[0126] Furthermore, the target RSSI setting for P2P resources is not limited to the minimum, maximum, and average target RSSIs set for adjacent uplink resources. For example, AP100 may also set the target RSSI of the P2P resource as the value obtained by adding an offset based on the allowable amount of interference to the target RSSIs (e.g., minimum, maximum, or average) set for the uplink resources adjacent to the P2P resource.

[0127] Furthermore, the target RSSI of a P2P resource is not limited to the target RSSI of an uplink resource adjacent to the P2P resource, but can also be based on at least one of the target RSSIs of uplink resources within a specified range starting from the P2P resource.

[0128] Next, the method for calculating the transmission power used in P2P and an example of the trigger frame format will be explained.

[0129] <Example 1>

[0130] In Example 1, the STA200 (e.g., DLS STA) can control the transmission power of the P2P link based on the status of the uplink (e.g., AP-STA link) and information indicated by the trigger frame (e.g., the target RSSI of the P2P link and the transmission power of the AP100).

[0131] As an example of the state of an AP-STA link, path loss in an AP-STA link can be listed. For example, the STA200 can control the transmission power of the P2P link based on the path loss in the AP-STA link.

[0132] Additionally, for example, the format of the trigger frame used for P2P can be the same as the trigger frame for the uplink in 11ax. Figure 15 This represents an example of a common information field contained in a trigger frame used for P2P. Figure 16 This represents an example of a user information field contained in a trigger frame used for P2P.

[0133] For example, it can be Figure 15 In the public information fields shown, a field representing the AP100's transmit power (e.g., access point transmit power) is set. Figure 16 In the user information fields shown, set the field representing the target RSSI (uplink target RSSI).

[0134] In addition, Figure 15 and Figure 16 In the trigger frame format shown, some fields may be missing, or new fields may be added.

[0135] For example, the target RSSI of a P2P link indicated by a trigger frame can be considered as the amount of interference that AP100 can tolerate.

[0136] As an example, to illustrate Figure 8 The diagram illustrates an example of a wireless communication system structure. For instance, a STA2 (e.g., a DLS STA) can have its transmission power set to a P2P link power below the transmission power calculated based on the path loss of the AP-STA2 link, the target RSSI indicated by the trigger frame, and the AP's transmission power (in other words, the upper limit of the transmission power).

[0137] In other words, for example, the STA200 can perform P2P link transmit power control by setting the received power of the P2P signal in the AP100 to below the target RSSI indicated by the trigger frame. For example, the STA200 can base its transmit power control on the received power of the downlink signal from the AP100 (e.g., DL). RSSI ), and the transmit power of AP100 indicated by the trigger frame (e.g., Tx). pwr AP ), to calculate the path loss of the AP-STA link (e.g., PL) according to equation (3). AP-STA ).

[0138] [Equation (3)]

[0139]

[0140] Additionally, the STA200 can, for example, be based on calculated path losses (e.g., PL). AP-STA ), and the target RSSI of the P2P link indicated by the trigger frame (e.g., Target RSSI). RSSI ), calculate the allowable P2P link transmission power (e.g., Tx) of AP100 according to equation (4). pwr_limit ).

[0141] [Equation (4)]

[0142] Tx pwr_limit =PL AP-STA +Target RSSI (4)

[0143] Next, the STA200 can, for example, transmit the power (e.g., Tx) of the P2P link as shown in equation (5). pwr P2P ) is set to the calculated transmission power (Tx) pwr_limit The following values.

[0144] [Equation (5)]

[0145]

[0146] The following is an example of the power control process for the aforementioned P2P link.

[0147] (Step 1) The STA200 can, for example, determine the transmission power (Tx) of the P2P link based on information related to the P2P link (e.g., quality information). pwr As an example of information related to a P2P link, the MCS, path loss, or packet error rate of the P2P link can be listed. Furthermore, the STA200 can, for example, set a predefined transmission power (e.g., a fixed transmission power such as the maximum transmission power) as the transmission power of the P2P link.

[0148] (Step 2) The STA200 can, for example, measure the received power of the downlink signal from the AP100 (e.g., DL). RSSI Based on the measured downlink signal received power and the AP100's transmit power indicated by the trigger frame (e.g., Tx), and based on the measured downlink signal received power and the AP100's transmit power indicated by the trigger frame (e.g., Tx), pwr AP The path loss of the AP-STA link (e.g., PL) is calculated according to equation (3). AP-STA Next, STA200, for example, based on path loss and the target RSSI indicated by the trigger frame (e.g., Target...),... RSSI According to equation (4), the allowable transmission power of the P2P link for AP100 (e.g., Tx) can be calculated. pwr_limit ).

[0149] (Step 3) STA200, for example, can use equation (6) to calculate the transmission power Tx in step 1. pwr and the transmission power Tx calculated in step 2 pwr_limit The power value of the smaller of the two is set as the transmission power of the P2P link.

[0150] [Equation (6)]

[0151]

[0152] In this way, the STA200 can perform P2P link transmission power control, for example, based on the path loss of the AP-STA link.

[0153] For example, it could be the transmission power Tx calculated based on information related to the P2P link. pwr The transmit power Tx of the P2P link is greater than that allowed by AP100. pwr_limit In this case, the STA200 sets the transmission power of the P2P link to Tx. pwr_limitTherefore, even in situations where P2P link signals might interfere with the AP100, the impact of P2P link signal interference on the AP100 can be reduced.

[0154] Additionally, for example, the transmission power Tx calculated based on information related to the P2P link. pwr The transmit power Tx of the P2P link allowed by AP100 pwr_limit In the following situations, the STA200 can set the transmission power of the P2P link to Tx. pwr Therefore, the STA200 can, for example, suppress interference to the AP100 and transmit P2P links at a transmission power suitable for the state (e.g., quality) of the P2P link.

[0155] Based on the above, the interference caused by P2P link transmission to the uplink reception processing in AP100 can be reduced, thus improving the uplink throughput.

[0156] <Example 2>

[0157] In Example 2, similar to Example 1, the STA200 (e.g., DLS STA) can control the transmission power of the P2P link based on the uplink status (e.g., path loss of the AP-STA link) and information indicated by the trigger frame (e.g., the target RSSI of the P2P link and the transmission power of the AP100).

[0158] In Example 2, STA200 can, for example, control the transmission power of the P2P link based on parameters related to beamforming in STA200. For example, by controlling the beamforming to orient the null towards AP100, interference from the P2P link signal transmitted from STA200 to AP100 is reduced. In this case, STA200 may be able to increase the transmission power of the P2P link, for example. In other words, it may be possible to relax the limitations on the transmission power of the P2P link in STA200.

[0159] Furthermore, the trigger frame for P2P in Example 2 can, for example, be the same as that in Example 1 (e.g., Figure 15 and Figure 16 )same.

[0160] The following is an example of the power control process for the aforementioned P2P link.

[0161] (Step 1) The STA200 can, for example, determine the transmission power (Tx) of the P2P link based on information related to the P2P link (e.g., quality information). pwrAs an example of information related to a P2P link, the MCS, path loss, or packet error rate of the P2P link can be listed. Furthermore, the STA200 can, for example, set a predefined transmission power (e.g., a fixed transmission power such as the maximum transmission power) as the transmission power of the P2P link.

[0162] (Step 2) The STA200 can, for example, measure the received power of the downlink signal from the AP100 (e.g., DL). RSSI Based on the measured downlink signal received power and the AP100's transmit power indicated by the trigger frame (e.g., Tx), and based on the measured downlink signal received power and the AP100's transmit power indicated by the trigger frame (e.g., Tx), pwr AP The path loss of the AP-STA link (e.g., PL) is calculated according to equation (3). AP-STA Next, STA200, for example, based on path loss and the target RSSI indicated by the trigger frame (e.g., Target...),... RSSI According to equation (4), the allowable transmission power of the P2P link for AP100 (e.g., Tx) can be calculated. pwr_limit ).

[0163] (Step 3) For example, it could be the transmission power Tx calculated in step 1. pwr Less than or equal to the transmission power Tx calculated in step 2 pwr_limit In this case, the STA200 sets the transmission power of the P2P link to Tx. pwr And end the calculation and processing of the transmission power used for P2P.

[0164] On the other hand, for example, it could be in the transmission power Tx pwr Greater than the transmission power Tx pwr_limit In this case, STA200 performs the processing after step 4.

[0165] (Step 4)

[0166] STA200 can, for example, estimate information related to the reduction of interference to AP100 (in other words, beamforming-related parameters, such as BF) based on beamforming applied by STA200 (e.g., precoding, antenna switching control, etc.) and channel estimates between AP-STA. effectFurthermore, for example, the channel estimate between AP and STA can be estimated based on at least one of the EHT-LTF and LTF of the PPDU containing the trigger frame, or it can be estimated based on the downlink null data packet (NDP). Additionally, for example, STA200 can also send an NDP to AP100 and receive feedback information containing the channel estimate estimated by AP100 based on the NDP.

[0167] STA200, for example, can be offset (e.g., BF) according to Equation (7) to correspond to the degree of reduction in interference caused to AP100. effect ) and transmission power Tx limit Add them together to calculate the AP100-permitted P2P link transmission power Tx' after adding the offset. pwr_limit For example, the greater the reduction in interference to the AP100, the higher the BF (Browser Filter). effect The larger the value is set, the better.

[0168] [Equation (7)]

[0169] Tx′ pwr_limit =Tx pwr_limit +BF effect (7)

[0170] (Step 5) STA200, for example, can use the transmission power Tx calculated in step 1. pwr and the transmission power Tx' calculated in step 4 pwr_limit The smaller power value is set as the transmission power of the P2P link.

[0171] In this way, STA200 performs P2P link transmit power control based, for example, on the path loss of the AP-STA link and parameters related to beamforming in STA200. Therefore, similar to Example 1, interference caused by P2P link transmission to the uplink reception processing in AP100 can be reduced, thus improving uplink throughput. Furthermore, in Example 2, beamforming control can suppress transmit power reduction in the P2P link aimed at suppressing interference to AP100 (in other words, it is easy to increase the P2P link transmit power).

[0172] <Example 3>

[0173] Example 1 or Example 2 illustrates the case where the permissible interference amount (e.g., target RSSI) notified by the trigger frame is one. Example 3 illustrates the case where the permissible interference amount (e.g., target RSSI) notified by the trigger frame is multiple.

[0174] For example, multiple target RSSIs could correspond to the priority of P2P link transmissions.

[0175] For example, the target RSSI (or allowable interference) for transmissions to higher-priority P2P links can be set high, while the target RSSI (or allowable interference) for transmissions to lower-priority P2P links can be set low. In other words, the higher the priority of the P2P link transmission, the higher the transmission power can be used for communication.

[0176] Figure 17 This diagram illustrates an example of a trigger frame format (user information field) when two priorities are set (e.g., high priority and low priority). Furthermore, the number of priorities set is not limited to two; it can also be three or more.

[0177] exist Figure 17 In, for example, it can be used with Figure 2 In the same "Uplink Target RSSI" field shown in 11ax, set the target RSSI for P2P link transmission with higher priority, and in the "Uplink Target RSSI#2" field, set the target RSSI for P2P link transmission with lower priority.

[0178] The setting value of the "Uplink Target RSSI#2" field is similar to that of the "Uplink Target RSSI" field, and can represent, for example, a value indicating that the target RSSI is the target RSSI. Figure 18 The absolute value of the RSSI shown (e.g., a value in a 7-bit table) can also be a value representing a relative offset from the set value of the "Uplink Target RSSI" field.

[0179] Additionally, for example, when setting (or notifying) multiple target RSSIs for different priorities, the number of bits in the field related to "Uplink Target RSSI" can be set (or changed) to a value different from the number of bits specified in 11ax. For example, in Figure 17 In this context, the "Uplink Target RSSI" field can be composed of 4 bits, and the "Uplink Target RSSI#2" field can be composed of 3 bits. This way, by suppressing the increase in signaling for the target RSSI, signaling overhead can be reduced. Additionally, for example, it is possible to suppress... Figure 17 The user information field shown has an increased number of bits compared to the user information field in 11ax. Furthermore, the number of bits for the "Uplink Target RSSI" and "Uplink Target RSSI#2" fields is not limited to the example above and can also be other numbers of bits.

[0180] Here, for example, the fewer bits in the field related to the uplink target RSSI, the less information can be notified. Therefore, for example, at least one of the notifiable maximum (e.g., -20dBm in 11ax) and minimum (e.g., -110dBm in 11ax) values ​​in at least one of the "Uplink Target RSSI" and "Uplink Target RSSI#2" fields can be changed. For example, the notifiable maximum value could be changed to a lower value, or the notifiable minimum value could be changed to a higher value. In other words, the notifiable value could be changed to a narrower range of values.

[0181] Alternatively, for example, the range of the target RSSI, which can be set by a certain number of bits, can be expanded by increasing the step size of the target RSSI. For example, in 11ax, the step size of the target RSSI is in 1 dB increments. Figure 17 In this context, the step size of the target RSSI can be, for example, a step size greater than 1 dB (e.g., 2 dB, 3 dB, or 4 dB or more).

[0182] Alternatively, for example, it can also be Figure 17 The “UL-HE-MCS” field or “Uplink Dual Subcarrier Modulation (DCM)” field shown is replaced with a notification field for multiple target RSSIs (e.g., “Uplink Target RSSI #2”) (not shown). In P2P links, for example, MCS and DCM are sometimes determined by the DLS STA rather than the AP100. In this case, it is not necessary for the AP100 to notify the DLS STA of the corresponding settings in the “UL-HE-MCS” and “UL DCM” fields. Therefore, the STA200 (e.g., the DLS STA) can receive information related to multiple target RSSIs in the “UL-HE-MCS” and “UL DCM” fields within the trigger frame.

[0183] Furthermore, it is not limited to the “UL-HE-MCS” and “UL DCM” fields; the fields corresponding to parameters determined by the DLS STA in the P2P link (in other words, parameters not determined by the AP100) can also be changed to notification fields of multiple target RSSIs.

[0184] For example, priority can be controlled (or determined, set) based on the frame type (e.g., frame type such as Management frame, Control frame), Access category (AC), or TID (or service category) of the PPDU sent in the P2P link.

[0185] Figure 19 , Figure 20 , Figure 21 and Figure 22 This is a diagram illustrating a priority setting example.

[0186] Figure 19 This is a diagram illustrating an example of setting priorities based on frame type category. Figure 19 In this context, for example, the priority of frames that transmit control information (e.g., management frames or control frames) can be set higher than the priority of frames that transmit data (e.g., data frames). According to... Figure 19 The priority settings shown, for example in P2P link transmission, can improve the reception quality of control information compared to the reception quality of data, thus suppressing the increase in latency, such as connection processing. Furthermore, the frame type can be a different category than management frames, control frames, and data frames.

[0187] Figure 20 It means except Figure 19 In addition to the frame type category, a diagram illustrates an example of prioritizing frames based on their transmission category within the same frame type. For example, in... Figure 20 In this context, the priority of ACK and Block-ACK in control frames can be set higher than the priority of other categories that are different from ACK and Block-ACK. According to... Figure 20 The priority settings shown, for example in P2P link transmission, can improve the reception quality of ACK and Block-ACK compared to other control information, thus, for example, suppressing the increase in latency of retransmission processing.

[0188] Figure 21 This diagram illustrates an example of prioritizing based on Access Class (AC). Figure 21In this context, for example, the priority of ACs with higher latency requirements (e.g., AC_VO (access category voice) and AC_VI (access category video)) can be set higher than the priority of ACs with lower latency requirements (e.g., AC_BK (access category background) and AC_BE (access category best effort))). Figure 21 The priority settings shown, for example in P2P link transmission, can suppress the latency of information corresponding to ACs with higher latency requirements. Furthermore, the AC category can also be related to... Figure 21 The categories shown are different categories.

[0189] Figure 22 This is a diagram illustrating an example of setting priorities based on TID. Figure 22 In this context, priorities can be set based on latency requirements corresponding to TIDs. For example, TIDs with a priority of 4 or higher can be prioritized higher than TIDs with a priority of less than 4. Furthermore, in... Figure 22 In this context, the threshold for setting TIDs related to priority is not limited to 4; it can be other values ​​as well. Alternatively, for example, unused TIDs in 11ax (e.g., values ​​greater than 7) can be assigned the highest priority as services with higher urgency.

[0190] In addition, it is also possible to Figure 19 , Figure 20 , Figure 21 and Figure 22 The priority settings shown by each can be combined. For example, they can also be combined. Figure 19 and Figure 21 The priority of a portion of the ACs (e.g., AC_VO and AC_VI) in the management frame, control frame, and data frame is set higher than the priority of other ACs (e.g., AC_BK and AC_BE) in the data frame.

[0191] Thus, in Example 3, AP100 can instruct STA200 to specify multiple target RSSIs corresponding to the priorities of P2P link transmissions. Alternatively, for example, for higher-priority P2P link transmissions, the corresponding target RSSI (or, the allowable interference level) can be set higher. Therefore, STA200 can, for example, set a higher transmission power for higher-priority P2P link transmissions, thereby improving the communication quality of the P2P link.

[0192] Furthermore, priorities are not limited to two (e.g., "high (high priority)" and "low (low priority)"), and more than three priorities can be set.

[0193] The above explains the calculation method for transmission power used in P2P and provides an example of the trigger frame format.

[0194] Thus, in this embodiment, STA200 performs transmit power control on P2P links (or STA-STA links) for other STAs based on parameters (e.g., path loss) related to the AP-STA link for AP100, and transmits signals in the P2P link according to the transmit power control.

[0195] Through this transmit power control, for example, in such Figure 8 As shown, when both uplink transmission triggered by the trigger frame and P2P link transmission are performed, interference (e.g., adjacent channel interference) caused by the P2P link transmission of STA2 to the AP can be suppressed. Therefore, according to this embodiment, the degradation of uplink signal reception performance can be suppressed and uplink throughput can be improved.

[0196] Furthermore, although this embodiment describes the case where STA200 performs P2P link transmission power control based on the AP-STA link status, it is not limited to this action. For example, STA200 may also switch between transmission power control based on the AP-STA link status and transmission power control based on the P2P (STA-STA) link status based on indication information from AP100.

[0197] Indication information related to the switching of transmit power control can be provided by AP100 to STA200 using trigger frames, beacons, or other control information.

[0198] The notification method for switching transmit power control can also be, for example, by notifying the flag (e.g., a 1-bit flag) of one of the two transmit power control methods in the user information field or public information field of the trigger frame.

[0199] Alternatively, switching the transmit power control can also be achieved by setting a value in the "Uplink Target RSSI" field of the user information field in the trigger frame. For example, this could be done by setting a value in the "Uplink Target RSSI" field (e.g., ...). Figure 18 When the value is '127', the STA200 performs transmit power control based on the state of the P2P link. When the value of the "Uplink Target RSSI" field is different from '127', the STA200 performs transmit power control based on the state of the AP-STA link.

[0200] For example, AP100 can also determine the switching between transmit power control based on the resource allocation results of the uplink and P2P links, or the parameters set for the uplink, namely, switching between transmit power control based on the AP-STA link state and transmit power control based on the P2P (STA-STA) link state. For example, if, according to the scheduling in AP100, resources adjacent to P2P resources are not allocated to the uplink, adjacent channel interference is unlikely to affect the uplink. Or, if robust parameters (e.g., MCS) are set for the uplink, adjacent channel interference is unlikely to affect the uplink. Thus, AP100 can also instruct STA200 to switch the transmit power control method of the P2P link based on the degree of interference that the P2P link may cause to the uplink. Therefore, interference from P2P link transmission to the UL link can be suppressed, and the degradation of communication quality of the P2P link can be suppressed.

[0201] (Implementation Method 2)

[0202] In Implementation 1, a method for controlling the transmission power of a P2P link based on the state of the AP-STA link was described. However, controlling the transmission power of a P2P link based on the state of the AP-STA link may not guarantee the quality of the P2P link. Therefore, in this implementation, for example, a method is described that controls the transmission power of the P2P link based not only on the state of the AP-STA link but also on the state of the P2P link (or, STA-STA link).

[0203] The wireless communication system of this embodiment may include, for example, AP100 and STA300.

[0204] In this embodiment, for example, STA300 (e.g., DLS STA) feeds back information related to the state of the P2P link (e.g., quality information) to AP100. Based on the fed-back information related to the state of the P2P link, AP100 determines the target RSSI for the P2P link. Thus, STA300 can, for example, perform transmit power control of the P2P link based on the state of the AP-STA link and the state of the P2P link.

[0205] Information related to the state of the P2P link may include, for example, information related to the target RSSI (allowed interference level) required by the DLS STA (hereinafter referred to as "Required Target RSSI"). For example, STA300 (DLS STA) can calculate the Required Target RSSI based on the quality information of the P2P link and notify (or feed back) AP100 of the information related to the calculated Required Target RSSI. AP100 can, for example, determine (or adjust) the target RSSI of the P2P link resources based on the Required Target RSSI notified by STA300.

[0206] In this way, the transmission power control of the P2P link is based not only on the state of the AP-STA link, but also on the state of the P2P link. This ensures the quality of the P2P link and reduces the interference caused by P2P link transmission to the uplink reception processing in the AP100.

[0207] [AP Structure]

[0208] The structure of AP100 in this embodiment can be the same as that in Embodiment 1. For example, AP100 can set (or adjust) the target RSSI for P2P based on the target RSSI requested by STA300.

[0209] Furthermore, examples of methods for setting the target RSSI for P2P using the requirement of target RSSI will be described later.

[0210] [Structure of STA]

[0211] Figure 23 This is a block diagram illustrating a structural example of the STA300 according to this embodiment. Furthermore, in Figure 23 In the context of implementation method 1 ( Figure 13 Identical structures are given the same labels, and their descriptions are omitted.

[0212] exist Figure 23 In this context, the target RSSI calculation unit 301 may, for example, calculate the permissible value (e.g., the target RSSI) of the interference caused by the transmission of the P2P link to the AP100 based on feedback information (e.g., CSI or path loss) from other STAs (e.g., DLP STAs) input from the received signal demodulation / decoding unit 202, or information such as the packet error rate of the P2P link. An example of the target RSSI calculation method in the target RSSI calculation unit 301 will be described later.

[0213] In addition, the target RSSI calculation unit 301 is required to generate control information containing information related to the calculated target RSSI based on a specified format, and output the control information to the transmission signal generation unit 206.

[0214] Furthermore, examples of the format of control information that includes information related to the required target RSSI will be described later.

[0215] [Examples of AP and STA actions]

[0216] Next, an example of the operation of AP100 and STA300 in this embodiment will be described.

[0217] <Method for setting the target RSSI for P2P>

[0218] AP100 can, for example, be used with embodiment 1 (e.g., Figure 14 Similarly, based on the target RSSI set for the uplink resources, the target RSSI of the P2P resources is set (e.g., referred to as "setting target RSSI"), which is the uplink resources adjacent to the P2P resources (e.g., RUs) allocated by scheduling.

[0219] Additionally, the AP100 can, for example, adjust the set target RSSI based on the required target RSSI fed back by the STA300. For instance, if the required target RSSI is higher than the set target RSSI, the AP100 can increase the target RSSI of the P2P resource until an acceptable interference level is reached.

[0220] Alternatively, when increasing the target RSSI of the P2P resource, the AP100 can reduce the MCS of the uplink resource adjacent to the P2P resource. Thus, even with increased interference from the P2P resource, the AP100 can reduce uplink data reception errors. Furthermore, the parameter changed based on the adjustment of the target RSSI of the P2P resource is not limited to the MCS; other parameters may also be used.

[0221] Additionally, for example, if the target RSSI is required to be below the set target RSSI, the AP100 can apply (in other words, without adjustment) the set target RSSI.

[0222] Alternatively, for example, AP100 may not allocate P2P resources to STA300 that submits a request for a target RSSI greater than the target RSSI set for the uplink resources adjacent to the P2P resources. Because resources are not allocated to this STA300, interference from P2P link transmissions on uplink reception can be eliminated, for example.

[0223] <Required Target RSSI Calculation Method>

[0224] This section provides an example illustrating the method for calculating the target RSSI in STA300.

[0225] For example, the STA300 can calculate the transmit power (e.g., Tx) in the P2P link based on feedback information (e.g., CSI or path loss) from other STAs (e.g., DLP STAs) in the P2P link. pwr P2P In addition, the transmission power Tx in the P2P link pwr P2P It can also be a pre-defined fixed transmission power (e.g., maximum transmission power).

[0226] Additionally, the STA300 can, for example, estimate the path loss (e.g., PL) between the AP and STA based on downlink signals (e.g., beacon or trigger frames) from the AP100. AP-STA ).

[0227] Next, the STA300 can, for example, calculate the RequiredTarget RSSI according to the following formula (8). RSSI ).

[0228] [Equation (8)]

[0229]

[0230] <Format of control information related to the required target RSSI>

[0231] Examples of the format of control information related to the required target RSSI that is notified by STA300 to AP100 (e.g., format 1 to format 4).

[0232] <Format 1>

[0233] Figure 24 This is a diagram illustrating an example of the format of the control information in Format 1.

[0234] Figure 24 The format shown can be, for example, the format of the Buffer Status Report (BSR) specified in Partial Change 11ax (in other words, the control field associated with the BSR). The format of the BSR can be, for example, the format of the Control Information subfield in the BSR Control subfield contained in the HT Control field of the MAC frame.

[0235] For example, the control information specified in 11ax (e.g., Figure 7 The maximum is 26 bits. Furthermore, in the 11ax BSR format, each 26 bits is used to notify a specific control message. Therefore, when sending a request for a target RSSI along with the BSR, a portion of the control message in the 11ax BSR can be reduced, and the freed-up bits can be used to notify the target RSSI. For example, in... Figure 24 In this context, the bit size of the queue (e.g., the high queue size and the all queue size) can be reduced by 2 bits from 8 bits in 11ax (e.g., a total of 4 bits), and the request target RSSI can be sent using 4 bits.

[0236] The requirements and objectives (RSSI) included in the BSR can be, for example, such as... Figure 18 The values ​​shown, representing absolute values, can also be relative to the target RSSI notified by the trigger frame or the requested target RSSI notified to AP100 in the past. For example, in Figure 24 In this context, the target RSSI is required to have a bit size of 4 bits, which is greater than... Figure 18 The target RSSI shown for 11ax has a smaller bit size (e.g., 8 bits). Therefore, it is also possible to change... Figure 24 The notifiable range (or, maximum value (-20dBm in 11ax) or minimum value (-110dBm in 11ax)) in the target RSSI field (4 bits) shown can also be set to larger steps such as 2dB or 3dB, instead of steps in 1dB units.

[0237] Furthermore, the notification bits for the target RSSI are not limited to 4 bits and can be of other bit sizes. Additionally, the position of the notification bits for the target RSSI is not limited to the end of the BSR format and can be at other positions. Furthermore, the control information in the BSR format that requests the target RSSI and has its bit size reduced is not limited to the queue size and can be other control information.

[0238] Here, the requested target RSSI is, for example, information attached to data transmitted in the P2P link. In other words, for example, if no data is being transmitted in the P2P link, the request for the target RSSI may not be notified. Therefore, by sending the request for the target RSSI along with the BSR to the AP100 as in Format 1, the STA300 can improve the efficiency of notification from the STA300 to the AP100.

[0239] Alternatively, by using the BSR format specified in 11ax to notify the target RSSI request, it is not necessary to define a new control frame format.

[0240] In addition, there are two methods for sending BSR, such as the method of triggering the sending of BSR by using a trigger frame sent from AP100 (e.g., called "Solicited BSR"), and the method of actively sending BSR by STA300 (e.g., called "Unsolicited BSR").

[0241] Figure 25 This is a sequence diagram representing action examples of AP100 (e.g., AP) and STA300 (e.g., STA#1, STA#2, and STA#3) in a request BSR. Figure 25 In this configuration, the AP can control both the uplink and P2P links separately. Additionally, in... Figure 25 For example, STA#1 can perform uplink communication with the AP. Additionally, in... Figure 25 In this context, for example, STA#2 (DLS STA) and STA#3 (DLP STA) can communicate in a P2P manner.

[0242] exist Figure 25 In this configuration, after acquiring the TXOP, the AP can send a trigger frame (or control signal) of type Buffer States Report Poll (BSRP) to STA#1 and STA#2 (e.g., DLSSTA). For example, the AP can send a common (or the same) trigger frame to both STA#1, which transmits uplink data, and STA#2, which transmits data in a P2P link.

[0243] STA#1 and STA#2 can send a BSR (e.g., TB-PPDU) to the AP after receiving a trigger frame. Furthermore, STA#1 can, for example, send the same BSR as 11ax to the AP (e.g., a BSR that does not require a target RSSI). On the other hand, STA#2 can, for example, send... Figure 24 The format of the BSR shown (e.g., a BSR that requires a target RSSI).

[0244] For example, the AP can send trigger frames that trigger the transmission of the P2P link and the uplink transmission based on the BSR notified by STA#1 and STA#2. For example, the AP can perform transmission power-related control (e.g., setting the target RSSI) in the P2P link based on the target RSSI requirement contained in the BSR notified by STA#2.

[0245] STA#1 can, for example, perform uplink transmission based on a trigger frame sent from the AP. Additionally, STA#2 can, for example, perform P2P link transmission (or transmission power control) for STA#3 based on a trigger frame sent from the AP.

[0246] Furthermore, a flag can be set (e.g., added) in the trigger frame to indicate the requested buffer status for both uplink and P2P data. For example, a BSR type field indicating the BSR category (e.g., for uplink or P2P) can be set (e.g., added) in the Trigger Dependent Userinfo field within the user information field. For example, the bit size of the BSR type could be 1 bit. As an example, a BSR type of 0 could represent uplink, and a BSR type of 1 could represent P2P.

[0247] Additionally, in the case of requesting a BSR for a P2P link, information can be set (or added) in the trigger frame to indicate that the STA300 should notify the resource requesting the target RSSI. For example, a notification field for the RU index or channel index (e.g., the location of a 20MHz channel) can be set in the trigger-dependent user information field. The STA300 can then use the resource notified by the RU index or channel index to send a request for the target RSSI back to the AP100.

[0248] Additionally, the STA300 can also transmit BSRs for P2P links in, for example, uplink-based random access (UORA: UL-Orthogonal Frequency Division Multiplexing (OFDMA)-based random access).

[0249] Figure 26 This is a sequence diagram representing action examples of AP100 (e.g., AP) and STA300 (e.g., STA#1, STA#2, and STA#3) in a non-request BSR. Figure 26 In this configuration, the AP can control both the uplink and P2P links separately. Additionally, in... Figure 26 For example, STA#1 can perform uplink communication with the AP. Additionally, in... Figure 26 In some cases, STA#2 (DLS STA) and STA#3 (DLP STA) can perform P2P communication.

[0250] exist Figure 26In this context, STA#2, for example, can send a message to the AP after obtaining the TXOP. Figure 24 The format of the BSR shown is (e.g., a BSR that includes a requirement for the target RSSI) (e.g., a single-user (SU)-PPDU). Alternatively, STA#1 may send the same BSR as 11ax to the AP (e.g., a BSR that does not include a requirement for the target RSSI) (not shown).

[0251] For example, the AP can send trigger frames that trigger the transmission of the P2P link and the uplink transmission based on the BSR notified by STA#1 and STA#2. For example, the AP can perform transmission power-related control (e.g., setting the target RSSI) in the P2P link based on the target RSSI requirement contained in the BSR notified by STA#2.

[0252] STA#1 can, for example, perform uplink transmission based on a trigger frame sent from the AP. Additionally, STA#2 can, for example, perform P2P link transmission (e.g., transmit power control) for STA#3 based on a trigger frame sent from the AP.

[0253] In addition, the STA300 can also send information containing flags to the AP100, indicating the buffer status to be sent to the AP100 for both uplink and P2P link data. For example, the STA300 can use the TID field of the QoS control field (e.g., Figure 3 The system sends information to AP100 indicating either the buffer status for uplink data or the buffer status for P2P link data. For example, it could indicate the BSR for P2P link when an unused TID value in the uplink is set (e.g., TID > 7), or the BSR for uplink when a TID used in the uplink is set (e.g., TID ≤ 7). Furthermore, the BSR for P2P link could, for example, include... Figure 24 The BSR required for the target RSSI is shown. The BSR used for the uplink can be, for example, the same BSR as 11ax.

[0254] <Format 2>

[0255] Figure 27 This is a diagram illustrating an example of the format of the control information in Format 2.

[0256] Figure 27 The format shown could be, for example, a format derived from a partial change to the format of the QoS control fields specified in 11ax (in other words, the control fields related to quality of service). For example, as... Figure 27 As shown, the requirement for a target RSSI can be specified within a portion of the QoS control field. For example, in Figure 27 In this context, the target RSSI field is set to replace the queue size field in the QoS control fields specified in 11ax.

[0257] Additionally, for example, STA300 can notify AP100 whether the target RSSI required for the P2P link is included in the QoS control field. For instance, STA300 can use the TID setting to notify AP100 of the presence or absence of the target RSSI requirement. For example, setting a TID value not used in the uplink (e.g., TID > 7) indicates that the QoS control field for the target RSSI requirement used in the P2P link is in a specific format. Alternatively, setting a TID used in the uplink (e.g., TID ≤ 7) indicates that the QoS control field format is the same as 11ax (e.g., a format that does not include the target RSSI requirement). Furthermore, the notification of the presence or absence of the target RSSI requirement is not limited to TID; other information can also be used to notify the presence or absence of the target RSSI requirement.

[0258] Thus, by using the format of the QoS control field specified in 11ax to notify the target RSSI request, it is not necessary to define a new control frame format.

[0259] In addition, Figure 27 As an example, the following situation is illustrated: the target RSSI field is specified to replace the queue size field in the QoS control fields defined in 11ax, but this is not a limitation. For example, the target RSSI field can also be specified to replace other fields within the QoS control fields. Additionally, in... Figure 27 In this context, the bit size of the target RSSI is not limited to 8 bits; it can also be other bit sizes (e.g., 4 bits).

[0260] Alternatively, for example, it can also be like Figure 28 As shown, the QoS control field includes two fields: queue size and target RSSI requirement. Here, the target RSSI requirement is, for example, information related to the data being transmitted on the P2P link. In other words, for example, if no data is being transmitted on the P2P link, the target RSSI requirement need not be notified. Therefore, by means of... Figure 28 As shown, sending the target RSSI along with the queue size can improve the efficiency of notifications from STA300 to AP100.

[0261] Furthermore, for example, the queue size and the number of bits required to be transmitted for each target RSSI are not limited to... Figure 28 The values ​​shown. For example, as Figure 28As shown, the queue size and the required target RSSI can each be 4 bits, fewer bits, or more bits. Additionally, for example, the queue size and the number of bits sent for the required target RSSI can also be different.

[0262] <Format 3>

[0263] In Format 3, for example, control information can be defined to request a target RSSI. In other words, in Format 3, for example, a request for a target RSSI can be sent in a format different from the format (or control field) specified in 11ax.

[0264] Figure 29 This is a diagram illustrating an example of the setting value of a control ID (e.g., information that identifies the category of control information) contained in a control subfield within a control field, such as an HT control field.

[0265] For example, such as Figure 29 As shown, for a control ID that is not used in 11ax (e.g., control ID = 7), the same format as format 1 can be defined for the BSR and the control information that requests the target RSSI (e.g., called "TID-based Buffer status report"). Furthermore, the control ID used to define the target RSSI for a P2P link is not limited to control ID = 7 and can be other values.

[0266] Additionally, for example in format 1 (e.g., Figure 24 In BSR format, ACI (access category indicator) is included. On the other hand, in format 3, TID may be included, for example. Figure 30 This is a diagram illustrating an example of the format of a TID-based buffer status report in Format 3. Figure 30 The format shown may include, for example, TID, queue size, and required target RSSI.

[0267] Similar to Format 1, the requested target RSSI is, for example, information attached to data transmitted in the P2P link. In other words, for example, if no data is being transmitted in the P2P link, the requested target RSSI may not be notified. Therefore, by sending the requested target RSSI along with the queue size to AP100 as in Format 3, STA300 can improve the efficiency of notification from STA300 to AP100.

[0268] Furthermore, for example, in format 3, the TID field can also be used to control the switching of TID-based buffer status reports to be sent to AP100. This switching occurs when using TID-based buffer status reports for the uplink (e.g., ...). Figure 31 ), and TID-based buffer status reports used in P2P links (e.g., Figure 30 Switching between () and (). For example, it could be that when an unused TID value is set in the uplink (e.g., TID > 7), it indicates that () Figure 30 The P2P link shown uses a TID-based buffer status report. When the TID used by the uplink is set (e.g., TID ≤ 7), it indicates that... Figure 31 The example shown is a TID-based buffer status report used for the uplink. Furthermore, a TID-based buffer status report used for a P2P link can be, for example, as shown below. Figure 30 As shown, this includes requirements for the target RSSI. Additionally, the uplink-based TID-based buffer status report can be, for example, as follows: Figure 31 As shown, it does not include the requirement for target RSSI.

[0269] Additionally, TID-based buffer status reports can also include, for example, information related to... Figure 30 and Figure 31 Other fields that differ from the fields shown. For example, a TID-based buffer status report may also include the "present" field of the current aggregated MAC Service Data Unit (A-MSDU) contained in the BSR.

[0270] Alternatively, the trigger type for triggering the TID-based buffer status report can be set in the control signal (e.g., trigger frame) that is notified to STA300 by AP100.

[0271] Furthermore, the format of the notification requirement target RSSI in Format 3 is not limited to... Figure 30 and Figure 31 The format shown. For example, it is also possible to define a format that does not contain... Figure 30 and Figure 31 The format of the TID field is shown.

[0272] <Format 4>

[0273] In Format 4, for example, the control information required for the target RSSI can be defined in the same way as in Format 3. In other words, in Format 4, for example, the requirement for the target RSSI can be sent in a format different from the format (or control field) specified in 11ax.

[0274] Figure 32This is a diagram illustrating an example of the setting value of a control ID (e.g., information that identifies the category of control information) contained in a control subfield within a control field, such as an HT control field.

[0275] For example, such as Figure 32 As shown, a format for control information requesting a target RSSI can be defined for a control ID that is not used in 11ax (e.g., control ID = 7). (e.g., called "Request Target Received Signal Strength Indicator Report (RTRR)"). Furthermore, the control ID defining the RTRR is not limited to control ID = 7 and can be other values.

[0276] Figure 33 , Figure 34 and Figure 35 This is a diagram illustrating an example of the RTRR format.

[0277] Figure 33 The RTRR format shown could, for example, include a target RSSI field but no other fields. The target RSSI could, for example, be... Figure 18 The trigger frame shown contains the same 7-bit value for the uplink target RSSI, but it can also be other values ​​(e.g., an offset value relative to the uplink target RSSI or a previously requested target RSSI). Because... Figure 33 The RTRR format shown does not include any other fields that differ from the target RSSI, thus reducing signaling overhead.

[0278] Figure 34 The RTRR format shown can be, for example, a format that includes a target RSSI field and an MCS field. In the RTRR format, in addition to requiring the target RSSI, the MCS is also notified to the AP100, so the AP100 can easily adjust the target RSSI, for example.

[0279] For example, when the MCS notified by the RTRR format is high (e.g., when the MCS is above a threshold), the AP100 can reduce the target RSSI set for the P2P link. For example, the AP100 can set a target RSSI lower than the required target RSSI. For example, the higher the MCS, the more leeway the STA300 has in reducing the MCS. Thus, for example, when the STA300 is notified of a target RSSI lower than the required target RSSI, it can maintain the reception quality of the P2P link and suppress transmission power by performing transmission control such as reducing the MCS of data (e.g., PPDUs) transmitted in the P2P link.

[0280] On the other hand, for example, if the MCS notified by the RTRR format is low (e.g., if the MCS is less than a threshold), AP100 may not reduce the target RSSI set for the P2P link. For example, AP100 may set a target RSSI at the same level as the required target RSSI. For example, because STA300 is notified of a target RSSI at the same level as the required target RSSI, it is able to transmit data without reducing the MCS of the data (e.g., PPDU) transmitted in the P2P link and without suppressing the transmission power.

[0281] In addition, in the RTRR format, the target RSSI can also be requested by MCS.

[0282] Figure 35 The format shown could be, for example, a format that includes a target RSSI field and a TID (or, ACI) field. By notifying the TID in the RTRR format, the AP100 can, for example, determine the urgency (in other words, the latency tolerance) of the P2P link transmission. The AP100 can, for example, determine whether to prioritize allocating resources to the P2P link based on the urgency of the P2P link transmission.

[0283] In addition, the trigger type for the Required Target RSSI report can also be set in the control signal (e.g., trigger frame) that is notified by AP100 to STA300.

[0284] The above illustrates an example of the format for control information that requires a target RSSI.

[0285] Thus, in this embodiment, STA300 sends parameters related to the P2P link (e.g., a request for the target RSSI) to AP100, and receives information related to the target RSSI determined in AP100 based on parameters related to the AP-STA link and parameters related to the P2P link. Therefore, STA300 can, for example, perform P2P link transmission power control based not only on the state of the AP-STA link but also on the state of the P2P link. Thus, according to this embodiment, STA300 can guarantee the quality of the P2P link and suppress interference (e.g., adjacent channel interference) caused by the P2P link transmission of STA300 to AP100.

[0286] The above describes the various embodiments of this disclosure.

[0287] (Other implementation methods)

[0288] (1) In the above embodiments, a P2P link (e.g., Figure 8Transmit power control in the STA2-STA3 link shown. However, one embodiment of this disclosure is not limited to transmit power control of P2P links, and can also be applied to STA-AP links (e.g., Figure 36 (The link shown is STA2-AP#2). For example, in Figure 36 In the case where a trigger frame is used to instruct STA2 to transmit uplink toward AP#2, AP#1 can also apply the method described in at least one of Embodiments 1 and 2 to the transmission power control in the uplink (STA2-AP#2 link) of STA2. Therefore, in Figure 36 In this way, the interference caused by the uplink transmission of STA2 to the reception and processing of uplink signals from STA1 in AP#1 can be reduced, and the uplink throughput can be improved.

[0289] In other words, in the above implementation, the transmission of STA2 triggered by the AP is not limited to P2P transmission, but can also be transmitted to the AP (e.g., Figure 8 AP or Figure 36 For AP#1) transmissions to different destinations, the same transmission power control method as described above is applied.

[0290] For example, the destination of STA2's uplink transmission could also be an AP of another BSS (e.g., a coordinating AP (not shown) in the case of multiple APs coordinating communication). In this case, the trigger frame could, for example, include "control information that distinguishes between uplink transmission and transmission different from that uplink transmission (e.g., including P2P)" instead of the "control information that distinguishes between uplink transmission and P2P link transmission" described in Implementation 1.

[0291] Furthermore, as a variation of the method of using a trigger frame to indicate transmission, arbitrary transmissions including uplink transmissions may also be allowed. In other words, the designated STA may also perform arbitrary communication (e.g., P2P communication) within the TXOP following the trigger frame. In this case, the control information within the trigger frame may, for example, be configured to distinguish between "uplink transmission only" and "other transmissions different from uplink transmissions are allowed." The STA receiving the trigger frame may also interpret the meaning of the target RSSI of the trigger frame according to the transmission category and perform transmission power control. For example, when uplink transmission is performed to the AP that sent the trigger frame, the transmission power control method specified in 11ax may be applied, and when transmissions different from uplink transmissions (e.g., including P2P link transmissions) are performed, the transmission power control method described in the above embodiments may be applied.

[0292] (2) In the above embodiments, although a transmission power control method related to P2P link transmission indicated by a trigger frame has been described, the transmission power control method for P2P links is not limited to a method based on a trigger frame. For example, one embodiment of this disclosure can be applied to P2P link transmission triggered by other control information (control frames or management frames) sent from AP100. As an example of control information, Triggered responsescheduling (TRS) Control (hereinafter referred to as "TRS") can be listed. Figure 37 This is a diagram illustrating an example of the TRS format. For example... Figure 37 As shown, the TRS contains the same access point transmit power field and uplink target RSSI field as the trigger frame. Therefore, in the case of TRS, the same transmit power control as the trigger frame can be performed.

[0293] (3) In the above embodiments, for example, a method was described in which the target RSSI contained in the trigger frame is regarded as the allowable interference amount in AP100, and the transmit power control of the P2P link is performed. For example, instead of the target RSSI, the transmit power control of the P2P link may also be based on the setting value of the uplink spatial reuse (UL spatial Reuse) field contained in the trigger frame. For example, when uplink spatial reuse is applied to the transmit power control of the P2P link, the STA may perform transmit power control in a manner that makes the interference power based on adjacent channel interference less than or equal to the allowable interference amount defined by uplink spatial reuse.

[0294] Furthermore, in the above embodiments, as an example, a structural example based on the 11ax control signal format was described, but the format of an embodiment of this disclosure is not limited to the 11ax format.

[0295] Furthermore, the formats shown in the above embodiments are examples, and this disclosure is not limited thereto. For example, some of the fields and subfields contained in the formats shown in the above embodiments may be omitted, fields and subfields that notify other information may be added, and the order of the fields and subfields may be changed. In addition, terms such as "field" and "subfield" may be interchanged.

[0296] Furthermore, the names of the information and fields shown in the above embodiments are examples, and this disclosure is not limited thereto.

[0297] Furthermore, although uplink communication has been described in the above embodiments, this disclosure is not limited thereto and can also be applied to downlink communication.

[0298] In addition, expressions such as "...part" in the above embodiments can also be replaced with other expressions such as "...circuitry", "...device", "...unit" or "...module".

[0299] This disclosure can be implemented in software, hardware, or software in cooperation with hardware. The functional blocks used in the above embodiments are implemented partially or entirely as LSIs (Large Scale Integrations), and the processes described in the above embodiments can also be controlled partially or entirely by a single LSI or a combination of LSIs. An LSI can be composed of individual chips, or it can be composed of a single chip containing some or all of the functional blocks. An LSI can also include data input and output. Depending on the degree of integration, an LSI can also be called an "IC (Integrated Circuit)," a "System LSI," a "Super LSI," or an "Ultra LSI." The method of integrated circuit implementation is not limited to LSIs; it can also be implemented using dedicated circuits, general-purpose processors, or special-purpose processors. Furthermore, FPGAs (Field Programmable Gate Arrays) that can be programmed after LSI fabrication, or reconfigurable processors that can reconfigure the connections or settings of the circuit blocks within an LSI, can also be used. This invention can also be implemented for digital or analog processing. Furthermore, if advancements in semiconductor technology or the emergence of other derivative technologies lead to integrated circuit technologies that can replace LSIs, these technologies could also be used to integrate functional blocks. There are also possibilities for applications such as biotechnology.

[0300] This invention can be implemented in all kinds of devices, apparatuses, and systems with communication capabilities (collectively referred to as "communication devices"). A communication device may also include a wireless transceiver and processing / control circuitry. The wireless transceiver may also include a receiving unit and a transmitting unit, or perform the functions of these units. The wireless transceiver (transmitting unit, receiving unit) may also include an RF (Radio Frequency) module and one or more antennas. The RF module may also include an amplifier, an RF modulator / demodulator, or similar devices. Non-limiting examples of communication devices include: telephones (mobile phones, smartphones, etc.), tablet computers, personal computers (PCs) (laptops, desktops, laptops, etc.), cameras (digital cameras, digital camcorders, etc.), digital players (digital audio / video players, etc.), wearable devices (wearable cameras, smartwatches, tracking devices, etc.), game consoles, e-book readers, remote health / telemedicine (remote healthcare / medical prescription) devices, vehicles or transportation vehicles with communication capabilities (cars, airplanes, ships, etc.), and combinations of the various devices described above.

[0301] Communication devices are not limited to portable or movable devices, but also include all kinds of devices, equipment, and systems that cannot be carried or fixed. Examples include: smart home devices (home appliances, lighting equipment, smart meters or meters, control panels, etc.), vending machines, and all other "things" that can exist on the IoT (Internet of Things) network.

[0302] In addition to data communication via cellular systems, wireless LAN (Local Area Network) systems, and communication satellite systems, communication also includes data communication via a combination of these systems.

[0303] In addition, the communication device also includes devices such as controllers or sensors that are connected or linked to the communication equipment performing the communication functions described in this invention. For example, it includes controllers or sensors that generate control signals or data signals used by the communication equipment performing the communication functions of the communication device.

[0304] In addition, the communication device includes infrastructure equipment that communicates with or controls the various devices described above (not limited to these), such as base stations, access points, and all other devices, equipment, and systems.

[0305] One embodiment of the present disclosure includes a terminal comprising: a control circuit that performs transmit power control for a second link to other terminals based on parameters related to a first link to an access point; and a transmit circuit that transmits a signal in the second link according to the transmit power control.

[0306] In one embodiment of this disclosure, the parameter represents the quality of the first link.

[0307] In one embodiment of this disclosure,

[0308] It also includes a receiving circuit that receives information related to the target received signal strength of the signal in the access point and information related to the transmission power of the access point. The control circuit performs the transmission power control based on the target received signal strength and the transmission power of the access point.

[0309] In one embodiment of this disclosure, the control circuit performs the transmit power control based on parameters related to the beamforming of the signal.

[0310] In one embodiment of this disclosure, the receiving circuit receives information related to the target received signal strength of each priority, which is the priority of transmission for the second link.

[0311] In one embodiment of this disclosure, the priority is determined based on at least one of access category, service category, and frame category.

[0312] In one embodiment of this disclosure, the receiving circuit receives information related to the target received signal strength in the modulation and coding scheme (MCS) field within the terminal-specific information field.

[0313] In one embodiment of this disclosure, the control circuit switches between transmit power control based on parameters associated with the first link and transmit power control based on parameters associated with the second link, based on indication information.

[0314] In one embodiment of this disclosure, a receiving circuit is also included, which receives the indication information in a trigger frame, beacon, or control information.

[0315] In one embodiment of this disclosure, a transmitting circuit is further included to send parameters related to the second link to the access point, and the receiving circuit receives information related to the target received signal strength based on parameters related to the first link and parameters related to the second link.

[0316] In one embodiment of this disclosure, the parameters associated with the second link include the target received signal strength of the signal set by the terminal.

[0317] In one embodiment of this disclosure, the transmitting circuit transmits parameters related to the second link in a control field associated with a buffer status report.

[0318] In one embodiment of this disclosure, the transmitting circuit transmits parameters related to the second link in a control field related to quality of service.

[0319] In one embodiment of this disclosure, the transmitting circuit transmits parameters related to the second link in a control field that is different from the field specified in IEEE 802.11ax.

[0320] In one embodiment of this disclosure, the control field contains information related to the business category.

[0321] In one embodiment of this disclosure, the transmitting circuit switches between a signal format that includes the target received signal strength and a signal format that does not include the target received signal strength based on information related to the service category.

[0322] In a communication method according to one embodiment of this disclosure, a terminal performs transmission power control on a second link to other terminals based on parameters related to a first link to an access point, and transmits signals in the second link according to the transmission power control.

[0323] The entire contents of the specification, drawings and abstract of the specification contained in Japanese Patent Application No. 2020-122948, filed on July 17, 2020, are incorporated herein by reference.

[0324] Industrial applicability

[0325] One embodiment of the present invention is useful for wireless communication systems.

[0326] Explanation of reference numerals in the attached figures

[0327] 100 AP

[0328] 101 Scheduler Department

[0329] 102 Control Signal Generation Unit

[0330] 103, 206 Transmitting signal generation unit

[0331] 104, 201 Wireless Transceiver Unit

[0332] 105, 202 Receive signal demodulation / decoding unit

[0333] 200, 300 STA

[0334] 203 Transmitting Power Calculation Department

[0335] 204 Signal Generation Unit

[0336] 205 Transmission Control Department

[0337] 301 Requires target RSSI calculation unit

Claims

1. A terminal, characterized in that, include: The receiving circuit receives information, including information related to the strength of a second target received signal and resources allocated to the second link, as well as information related to the transmission power of the access point, included in a trigger frame transmitted from the access point. The control circuit controls the transmission power of the second link for other terminals based on parameters related to the first link for the access point. as well as The transmitting circuit, according to the transmitted power control, transmits a second signal in the second link. The control circuit performs the transmission power control based on the second target received signal strength and the transmission power of the access point, so as to adjust the difference between the received power of the second signal at the access point and the received power of the first signal in the first link at the access point.

2. The terminal as described in claim 1, wherein, The control circuit performs the transmit power control based on parameters related to the beamforming of the signal.

3. The terminal as described in claim 1, wherein, The receiving circuit receives information about the second target received signal strength in relation to the transmission priority of the second link.

4. The terminal as described in claim 3, wherein, The receiving unit receives information about the received signal strength of the second target in a field, wherein information related to the received signal strength of the second target replaces the parameters in the field, and the parameters are determined by the terminal for the second link rather than by the access point.

5. The terminal as described in claim 3, wherein, The priority is determined based on at least one of the access category, service category, and frame category.

6. The terminal as described in claim 3, wherein, The receiving circuit receives information related to the received signal strength of the second target in the modulation and coding scheme (MCS) field within the terminal-specific information field.

7. The terminal as claimed in claim 1, wherein, The control circuit switches between transmit power control based on parameters related to the first link and transmit power control based on parameters related to the second link, based on indication information.

8. The terminal as described in claim 7, wherein, It also includes a receiving circuit that receives the indication information in a trigger frame, beacon, or control information.

9. The terminal as claimed in claim 1, wherein, The transmitting circuit sends parameters related to the second link to the access point. The control circuit performs the transmit power control based on the second target received signal strength determined based on the parameters associated with the second link.

10. The terminal as described in claim 9, wherein, Among the parameters associated with the second link is the third target received signal strength required by the terminal to transmit in the second link.

11. The terminal as claimed in claim 9, wherein, The transmitting circuit sends parameters related to the second link in the control field associated with the buffer status report.

12. The terminal as described in claim 9, wherein, The transmitting circuit transmits parameters related to the second link in the control field related to quality of service.

13. The terminal as described in claim 9, wherein, The transmitting circuit transmits parameters related to the second link in a control field that differs from the field specified in IEEE 802.11ax.

14. A communication method, characterized in that: The terminal receives information, including information related to the second target received signal strength and resources allocated to the second link, as well as information related to the transmission power of the access point, included in a trigger frame sent from the access point. Based on parameters related to the first link for the access point, transmit power control is performed on the second link for other terminals, and a second signal is transmitted in the second link according to the transmit power control. The transmission power control is performed based on the second target received signal strength and the transmission power of the access point to adjust the difference between the received power of the second signal at the access point and the received power of the first signal in the first link at the access point.

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