Communication device and communication method

Abstract

The present invention improves the throughput of a communication system by means of a communication device comprising: a control circuit that performs transmission power control corresponding to a transmission scheme for each individual band included in multiple bands; and a transmitter / receiver circuit that transmits a signal using the multiple bands.

Description

Communication device and communication method

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

[0002] The Institute of Electrical and Electronics Engineers (IEEE) is currently working on the IEEE 802.11be standard for next-generation wireless local area networks (LANs), which will be the successor to the IEEE 802.11ax standard. For example, IEEE 802.11ax is also known as High Efficiency (HE), and IEEE 802.11be is also known as Extremely High Throughput (EHT).

[0003] IEEE 802.11-20 / 1935r66, Compendium of straw polls and potential changes to the Specification Framework Document - Part 2IEEE 802.11-20 / 1399r2, On Joint C-SR and C-OFDMA M-AP Transmission

[0004] Transmission power control for cooperative communication in wireless communication such as wireless LAN has not been fully studied.

[0005] Non-limiting examples of the present disclosure contribute to providing a wireless communication device and a wireless communication method that can perform appropriate transmission power control in cooperative communication.

[0006] A communication device according to one embodiment of the present disclosure includes a control circuit that performs transmission power control corresponding to a transmission scheme for each of multiple bands, and a transceiver circuit that transmits signals using the multiple bands.

[0007] These comprehensive or specific aspects may be realized as a system, an apparatus, a method, an integrated circuit, a computer program, or a recording medium, or may be realized as any combination of a system, an apparatus, a method, an integrated circuit, a computer program, and a recording medium.

[0008] According to an embodiment of the present disclosure, appropriate transmission power control can be performed in cooperative communication.

[0009] Further advantages and benefits of one embodiment of the present disclosure will become apparent from the specification and drawings. Such advantages and / or benefits may be provided by some embodiments and features described in the specification and drawings, respectively, but not necessarily all of them may be provided to obtain one or more identical features.

[0010] Figure showing an example of MAP scheme separation.Figure showing an example of transmission power spectral density.Figure showing an example of transmission power control when the MAP scheme differs for each band.Figure showing another example of transmission power control when the MAP scheme differs for each band.Figure showing yet another example of transmission power control when the MAP scheme differs for each band.Figure showing how the MAP scheme is specified by Common Info information.Figure showing how the MAP scheme is specified by Per AP Info information.Figure showing how the MAP scheme is specified by Per STA Info information in Per AP Info.Figure showing how the MAP scheme is specified by Per STA Info information.Figure showing how to switch the MAP scheme specification format.Figure showing an example of transmission power control when the SR operation differs for each band.Figure showing another example of transmission power control when the SR operation differs for each band.Figure showing yet another example of transmission power control when the SR operation differs for each band.Figure showing an example of transmission power control when Beamformed operation differs for each band.Figure showing the overall sequence related to MAP communication.Figure showing an example of sending and receiving Beacon frame and Probe Request / Response frame in the setup phase.Figure showing an example of sending and receiving Association Request / Response frames in the setup phase.Action in the setup phase An example of sending and receiving frames: NDPA frame for MAP, NDP frame for MAP, MAP Poll Trigger,Figure showing an example of sending and receiving Control frames such as MAP BFR. Figure showing an example of sending and receiving in the MAP setup phase, which sets up MAP, and in MAP data transmission. Figure showing a configuration based on the existing EHT Operation element as the NGT Operation element. Figure showing a configuration in which a new element is defined as the TPC Supported Subchannel element with a similar configuration to the EHT Operation element. Figure showing a configuration in which a new element is defined as the TPC Supported Subchannel element with a similar configuration to the Supported Channels element. Figure showing a configuration in which a new Category Action frame is defined as the TPC Support Action frame. Figure showing a configuration in which a new Category Action frame is defined as the NGT Action frame, and the value of the NGT Action field is defined as the TPC Supported Subchannel Notification frame. Figure showing an example of defining a Subfield in the NGT EHT PHY Capabilities Information field. Figure showing an example of defining the range of the transmit power difference depending on the RU size. Figure showing an example of defining the Capability for the range of the transmit power difference in response to the SR setting for each area. Figure explaining the case of uplink. FIG. 1 is a diagram showing an example of transmission power control when the scheme is different. FIG. 2 is a block diagram showing a partial configuration example of an AP according to an embodiment of the present disclosure. FIG. 3 is a block diagram showing a partial configuration example of an STA according to an embodiment of the present disclosure.

[0011] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the embodiments described below are merely examples, and the present disclosure is not limited to the following embodiments.

[0012] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings as appropriate. However, more detailed explanation than necessary may be omitted. For example, detailed explanation of already well-known matters or redundant explanation of substantially identical configurations may be omitted. This is to avoid unnecessary redundancy in the following explanation and to facilitate understanding by those skilled in the art.

[0013] The accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0014] In the IEEE 802.11be or future generation standards, the application of Multi-AP (hereinafter referred to as "MAP") coordination (hereinafter referred to as "cooperative communication") is being considered, in which multiple access points (also called "base stations", hereinafter referred to as "APs (Access Points)") cooperate to send and receive data between each terminal (also called non-AP STAs (Station), hereinafter referred to as "STAs")

[0015] For cooperative communication in IEEE 802.11be, several MAP cooperative communication schemes (hereinafter referred to as "MAP schemes") are being considered. For example, the following MAP schemes are available (see, for example, Non-Patent Document 1): Coordinated Spatial Reuse (hereinafter referred to as "C-SR") Coordinated OFDMA (hereinafter referred to as "C-OFDMA") Coordinated Beamforming (hereinafter referred to as "C-BF") Joint Transmissions (hereinafter referred to as "JT")

[0016] In this specification, JT is defined to include both a method of transmitting the exact same signal from multiple cooperating APs and Distributed MU-MIMO (Multi-User Multi-Input Multi-Output) (hereinafter referred to as "D-MIMO"), which transmits different transmission streams from multiple cooperating APs. Note that JT may also be defined as a method of transmitting the exact same signal from multiple cooperating APs that does not include D-MIMO.

[0017] Note that the MAP scheme may be interchangeably read as other terms such as "communication type" or "MAP type."

[0018] It is also known that the system throughput and frequency utilization efficiency can be improved by combining C-SR and C-OFDMA (see, for example, Non-Patent Document 2).

[0019] As described in Non-Patent Document 2, when the MAP scheme differs for each band, it is conceivable that the transmission power control (TPC) method will differ for each band, but the control method has not been determined.

[0020] For example, when the transmission power of other bands (e.g., C-OFDMA or JT) is reduced in accordance with the transmission power control of some bands (e.g., by C-SR), the performance of other bands deteriorates, the selectable Modulation and Coding Scheme (MCS) value becomes smaller, and the throughput of the communication system may decrease.

[0021] In an embodiment of the present disclosure, in multi-band transmission, different transmission power control is performed for each band.

[0022] FIG. 1 is a diagram showing an example of MAP scheme segregation. In this example, two types of MAP schemes, C-SR and C-OFDMA, are used. FIG. 1 shows an example in which STA#0 and STA#2 are located in the C-SR region, and STA#1 is located in the C-OFDMA region. FIG. 1 also shows an example in which STA#0 and STA#1 are connected (associated) to AP#0, and STA#2 is connected to AP#1. Therefore, AP#0 performs C-SR for STA#0 and C-OFDMA for STA#1. AP#1 performs C-SR for STA#2.

[0023] Figure 2 shows an example of the transmission power spectral density (PSD) of AP #0 and AP #1 in the example shown in Figure 1. AP #0 transmits to STA #0 using MCS #X on the primary 20 MHz (P20) channel and to STA #1 using MCS #Y on the secondary 20 MHz (S20) channel. AP #1 transmits to STA #2 using MCS #Z on the primary 20 MHz (P20) channel and does not transmit on the secondary 20 MHz (S20) channel. Here, #X, #Y, and #Z indicate MCS indices, which are values ​​between 0 and 15 in the case of IEEE 802.11be.

[0024] STA#0 and STA#2 operate in C-SR, so transmissions are made from AP#0 and AP#1 on the same P20 channel. STA#1 operates in C-OFDMA, so transmissions on the S20 channel are made from AP#0 to which STA#1 is connected, and not from AP#1.

[0025] Although the term "band" is used below, it may be interpreted as "Resource Unit (RU)," "Channel," "Subchannel," or "Subband."

[0026] As shown in Figure 2, an AP is expected to transmit at the same transmit power in all bands even if the MAP scheme for each band is different. As a result, if the AP reduces the transmit power of other bands (e.g., C-OFDMA or JT) in accordance with the transmit power control of some bands (e.g., by C-SR), the performance of other bands may deteriorate, the selectable MCS value may become smaller, and the throughput may decrease.

[0027] In response to this, the AP can select a high MCS value by performing different transmission power control depending on the transmission scheme for each band, for example, the MAP scheme, thereby improving throughput.

[0028] IEEE 802.11be has a function to boost power for each RU in OFDMA transmission, but the range of power boost is limited to ±6 dB. This function is designed for OFDMA transmission and does not take into account cases where the transmission scheme, for example, the MAP scheme, differs for each band.

[0029] The present disclosure makes it possible to select a high MCS value by performing transmission power control corresponding to a transmission scheme for each of multiple bands, thereby improving throughput.

[0030] (First Embodiment) In the first embodiment, as an example of performing different transmission power control for each band, the AP performs transmission power control corresponding to a MAP scheme for each band.

[0031] Figure 3 is a diagram showing an example of transmission power control when different MAP schemes are used for different bands in the network shown in Figure 1. As shown in Figure 3, for example, C-SR is defined as a MAP scheme involving transmission power control, and transmission power control is performed independently for C-SR and other bands. In the example shown in Figure 3, for the P20 channel, both AP#0 and AP#1 perform transmission power control using C-SR, but for the S20 channel, control is performed independently from the P20 channel; for example, AP#0 does not perform transmission power control and maintains its transmission power. Furthermore, even in C-SR, different transmission power control may be performed for each C-SR in each band depending on the C-SR control type and interference conditions.

[0032] According to the example of transmission power control in FIG. 3, the transmission power of the signal transmitted by the AP is not reduced due to the influence of transmission power control in other bands, and therefore throughput does not decrease.

[0033] Fig. 4 is a diagram showing another example of transmission power control when the MAP scheme differs for each band. As in the other example shown in Fig. 4, the transmission power of other bands may be changed in response to a change in the transmission power of the band for which transmission power control is performed. For example, when the transmission power of one band is reduced, the transmission power of the other bands may be increased. The transmission power may also be adjusted between bands so that the total transmission power remains constant.

[0034] In the example of Figure 3, transmission power control is not performed for the S20 channel, but according to the transmission power control example of Figure 4, when AP #0 transmits a signal on the S20 channel, if the signal to be transmitted on the P20 channel (another band) has its transmission power reduced, the transmission power of the signal to be transmitted on the S20 channel is increased, thereby allowing the overall transmission power of the transmitter to be used effectively.

[0035] Fig. 5 is a diagram showing yet another example of transmission power control when the MAP scheme differs for each band. As in the yet another example shown in Fig. 5, the AP may control by assigning a band and a MAP scheme to each STA so that the transmission power of the signal transmitted on the primary channel is maximized. As shown in Fig. 5, each AP may assign C-OFMDA operation, which does not perform transmission power control, to the primary channel, and C-SR, which performs transmission power control, to the secondary channel.

[0036] In Fig. 5, AP#0 transmits signals to STA#1 using MCS#Y+ (e.g., an MCS larger than MCS#Y) on the primary 20MHz (P20) channel and transmits signals to STA#0 using MCS#X on the secondary 20MHz (S20) channel. AP#1 does not transmit on the primary 20MHz (P20) channel, but transmits signals to STA#2 using MCS#Z on the secondary 20MHz (S20) channel.

[0037] In the example of transmission power control in Figure 5, AP #0 assigns C-SR, which performs transmission power control, to the S20 channel and C-OFDMA, which does not perform transmission power control, to the P20 channel, and when transmitting a signal on the P20 channel, the transmission power is increased when the transmission power is reduced by transmission power control when transmitting a signal on the S20 channel (other band).

[0038] In the example of transmission power control in Figure 4, the power of the signal transmitted on the secondary channel is greater than the power of the signal transmitted on the primary channel. However, according to the example of transmission power control in Figure 5, by increasing the transmission power of the signal transmitted on the primary channel of AP #0, the reception performance of the preamble transmitted on the primary channel is improved, thereby improving throughput.

[0039] Examples of methods for specifying a MAP scheme for each band will be described with reference to Figures 6 to 10. The frames in Figures 6 to 10 may be trigger frames for MAP (for example, MAP Trigger frames).

[0040] FIG. 6 shows how a MAP scheme is specified by Common Info information. As shown in FIG. 6, a frame includes Common Info and Per AP Info for the number of APs. Common Info includes a MAP scheme and MAP scheme dependent common info. The MAP scheme includes the number of APs and subfields (AP#1, AP#2, etc.) for the number of APs. The subfield for each AP includes the number of RUs and subfields (RU#1, RU#2, etc.) for the number of RUs. Each Per AP Info includes MAP scheme dependent info for the number of RUs. This MAP scheme dependent info includes information elements corresponding to the MAP scheme included in the subfield for each RU (RU#1, RU#2, etc.). FIG. 6 shows examples of information elements for C-SR Type 1, C-SR Type 2, C-SR Type 3, JT, D-MIMO, CBF, and C-OFDMA.

[0041] The MAP scheme in Common Info indicates the number of APs and the MAP scheme for all APs. The subfield for each RU in the MAP scheme indicates the MAP scheme for each RU. Here, an RU may be defined as a channel or subchannel. The MAP scheme Dependent Common Info and MAP scheme Dependent Info contain information corresponding to the MAP scheme (e.g., information on transmission power control). For example, the MAP scheme may define information about the MAP scheme and MAP scheme Dependent Common Info corresponding to each index, as shown in the table at the bottom left of Figure 6.

[0042] The correspondence between the MAP scheme and the information elements in the MAP scheme dependent info may be determined together with the MAP scheme for each index, as shown in the table at the bottom left of Fig. 6, or the correspondence between the MAP scheme and the information elements may be specified in a separate table. The separate table may be determined in advance or notified by a separate method.

[0043] The MAP scheme and MAP scheme dependent common information may be specified in correspondence with the index as shown in the table at the bottom left of Fig. 6, or the correspondence between the MAP scheme and the MAP scheme dependent common information may be specified in a separate table. The separate table may be determined in advance or notified by a separate method.

[0044] 7 is a diagram showing how a MAP scheme is specified by Per AP Info information. As shown in Fig. 7, Per AP Info is included in a frame. Per AP Info includes a MAP scheme and MAP scheme dependent information for the number of RUs.

[0045] The MAP scheme includes the number of RUs of the AP and subfields (RU#1, RU#2, ...) for the number of RUs. RU#1, RU#2, ... indicate the MAP scheme for each RU. Each MAP scheme dependent info is composed of elements corresponding to the MAP scheme indicated by RU#1, RU#2, .... The definition of the MAP scheme and the correspondence between the MAP scheme and the information elements in the MAP scheme dependent info may be defined for each index, as in the case of Figure 6.

[0046] FIG. 8 shows how a MAP scheme is specified by the Per STA Info information in the Per AP Info. As shown in FIG. 8, the frame includes Common Info and Per AP Info. Common Info includes the number of STAs connected to each AP and a MAP scheme list. As shown in FIG. 8, the MAP scheme list is composed of multiple MAP scheme elements. Each MAP scheme element includes one MAP scheme element value corresponding to a MAP scheme element variant. FIG. 8 shows an example in which MAP scheme element 1 includes a MAP scheme element value of 0 (C-SR Type 1) and MAP scheme element 2 includes a MAP scheme element value of 3 (C-OFDMA), resulting in a MAP scheme list including C-SR Type 1 and C-OFDMA. Other MAP scheme element values ​​may also be indicated. Per AP Info includes the number of RUs and Per STA Info (information for each STA) for the number of STAs. Per STA Info includes MAP scheme indexes and MAP scheme dependent information for the number of RUs. MAP scheme indexes include MAP scheme indexes for the number of RUs.

[0047] Each MAP scheme element specifies a MAP scheme. Each MAP scheme element may define a MAP scheme element value and a corresponding MAP scheme.

[0048] The number of RUs in Per AP Info specifies the number of MAP scheme indexes and MAP scheme dependent information included in Per STA Info.

[0049] The MAP scheme Index indicates the index of the MAP scheme Element defined in the MAP scheme List. As shown in the MAP scheme Index variant table in Fig. 8, the correspondence between the MAP scheme Index and the MAP scheme Element is defined, and for example, the correspondence may be as follows: MAP scheme Index variant = MAP scheme Element (MAP scheme Index value + 1)

[0050] MAP scheme dependent information consists of elements corresponding to the MAP scheme indicated by the MAP scheme indexes. MAP scheme dependent information includes information elements corresponding to the MAP scheme of each RU.

[0051] Figure 9 is a diagram showing how a MAP scheme is specified by Per STA Info information. As shown in Figure 9, a frame contains Per STA Info for the number of STAs. Each Per STA Info contains a MAP scheme and MAP scheme Dependent Info for the number of RUs. The MAP scheme contains the number of RUs and MAP scheme indications (RU#1, RU#2, ...) for the number of RUs. Each MAP scheme Dependent Info is made up of elements corresponding to the MAP scheme indicated by RU#1, RU#2, ...

[0052] Fig. 10 is a diagram showing a method for switching the format specified by the MAP scheme. As shown in Fig. 10, the frame includes Common Info. The Common Info includes the MAP Format Type.

[0053] The MAP Format Type switches the format of the MAP scheme specification. As shown in the table at the bottom left of Figure 10, the specification method shown in Figures 6 to 9 is switched according to the MAP Format Type value. The example in Figure 10 is an example of a frame when the MAP Format Type value is set to 0 and the specification method where the MAP scheme is included in Common Info is selected.

[0054] As described above, according to the first embodiment, the AP performs transmission power control corresponding to the MAP scheme for each band, which allows the AP to select a higher MCS, thereby improving the throughput of the communication system.

[0055] (Embodiment 2) In embodiment 2, as an example of performing different transmission power control for each band, the AP performs transmission power control according to whether or not Spatial Reuse (SR) operation is performed for each band.

[0056] 11 is a diagram showing an example of transmission power control when SR operation differs for each band. AP#0 performs OFDMA multiplexing using the P20 channel and the S20 channel, and assigns them to STA#0 and STA#1, respectively. AP#1 assigns the P20 channel to STA#2 for SR operation, and the S20 channel for non-SR operation.

[0057] AP#0 performs SR operation on the P20 channel and suppresses the transmission power of signals transmitted on AP#0's P20 channel to suppress interference with STA#2. Meanwhile, the transmission power of signals transmitted on AP#0's S20 channel is independent of the transmission power control of the P20 channel, and for example, transmission power control is not performed. Figure 11 shows an example in which signals transmitted on AP#1's P20 channel are not subjected to transmission power control and transmission power is maintained. Figure 11 shows an example in which AP#0 reduces the transmission power of signals transmitted on the P20 channel performing SR operation, but AP#1 does not reduce the transmission power.

[0058] 12 is a diagram showing another example of transmission power control when SR operation differs for each band. As in the other example shown in FIG. 12, the AP may change the transmission power of other bands in response to a change in the transmission power of the SR operation band in which transmission power control is performed. For example, when the AP reduces the transmission power of signals transmitted in some bands, it may increase the transmission power of signals transmitted in other bands, or it may adjust the transmission power between bands so that the total transmission power of the transmitted signals remains constant.

[0059] In the example of Figure 11, AP #0 does not perform transmission power control for signals transmitted on the S20 channel. However, according to the transmission power control example of Figure 12, the transmission power of the signal transmitted on the S20 channel is increased when the transmission power of the signal transmitted on the P20 channel (another band) is reduced, thereby enabling effective use of the transmission power of the entire transmitter.

[0060] Figure 13 is a diagram showing yet another example of transmission power control when SR operation differs for each band. As in the yet another example shown in Figure 13, bands may be assigned to each STA to control the signal power transmitted on the primary channel so that the signal power is maximized. As shown in Figure 13, each AP may assign non-SR operation, which does not perform transmission power control, to the primary channel, and SR operation, which performs transmission power control, to the secondary channel.

[0061] In FIG. 13, AP#0 transmits a signal to STA#1 using MCS#Y+ on the primary 20 MHz (P20) channel, and transmits a signal to STA#0 using MCS#X on the secondary 20 MHz (S20) channel.

[0062] AP#1 does not transmit a signal on the primary 20 MHz (P20) channel, but transmits a signal using MCS#Z to STA#2 on the secondary 20 MHz (S20) channel.

[0063] In the example of transmission power control in Figure 13, AP #0 assigns SR operation, which performs transmission power control, to the S20 channel and non-SR operation, which does not perform transmission power control, to the P20 channel, and when transmitting a signal on the P20 channel, the transmission power is increased when the transmission power is reduced by transmission power control when transmitting a signal on the S20 channel (other band).

[0064] In the transmission power control example of Figure 12, the power of the signal transmitted on the secondary channel is greater than the power of the signal transmitted on the primary channel. However, according to the transmission power control example of Figure 13, by increasing the transmission power of the signal transmitted on the primary channel of AP #0, the reception performance of the preamble transmitted on the primary channel is improved, thereby improving throughput.

[0065] As described above, according to the second embodiment, the AP performs transmission power control according to whether or not SR operation is performed for each band, thereby enabling the selection of a higher MCS, thereby improving the system throughput of the communication system.

[0066] (Third Embodiment) In a third embodiment, as an example of performing different transmission power control for each band, the AP determines whether or not to perform transmission power control in accordance with the Beamformed setting for each band.

[0067] 14 is a diagram showing an example of transmission power control when Beamformed operation differs for each band. In FIG. 14, AP#0 performs OFDMA multiplexing using the P20 channel and the S20 channel, and assigns the P20 channel to STA#0 and the S20 channel to STA#1. The example shows that the P20 channel operates in Beamformed mode to suppress interference with STA#2 of AP#1, and the S20 channel operates in Non-Beamformed mode.

[0068] This shows an example in which AP#1 allocates the P20 channel to STA#2 while performing beamformed operation so as to suppress interference with STA#0 under the control of AP#0.

[0069] In the P20 channel, AP#0 and AP#1 control the signal power of the signals transmitted to STA#0 and STA#2 under their control so as to suppress interference with each other's subordinate STA#2 and STA#0, but the transmission power control of signals transmitted in AP#0's S20 channel is independent of the transmission power control of signals transmitted in the P20 channel, and an example is shown in which no transmission power control is performed.

[0070] As in the first and second embodiments, the AP may change the transmission power of signals transmitted in other bands in accordance with the Beamformed operation band. For example, when the AP reduces the transmission power of signals transmitted by Beamformed operation in some bands, it may increase the transmission power of signals transmitted in other bands, or it may adjust the transmission power between bands so that the total transmission power of transmitted signals remains constant. Furthermore, it may be possible to control the allocation of whether or not to perform Beamformed operation so that the power of signals transmitted in the Primary channel is maximized.

[0071] In this way, by controlling the transmission power independently for each band, corresponding to whether each band is beamformed or non-beamformed, it becomes possible to select a higher MCS, thereby improving the throughput of the communication system.

[0072] (Fourth embodiment) In a fourth embodiment, the presence or absence of transmission power control for each band is notified by management frames.

[0073] FIG. 15 is a diagram showing the overall sequence related to MAP communication. As shown in FIG. 15, the overall sequence is divided into the following four phases. These phase definitions are merely examples, and other classifications may also be used for definition. The order of the phases may also be reversed, such as performing measurements in the measurement phase followed by the setup phase.

[0074] In the setup phase, management information is exchanged between nodes (APs, STAs) using management frames such as Beacon frames, Probe Request / Response frames, Association Request / Response frames, and Action frames.

[0075] The measurement phase involves issuing measurement instructions, measuring, and collecting feedback such as Channel State Information (CSI) between nodes using control frames such as the MAP Null data PPDU (physical layer protocol data unit) Announcement (NDPA) frame, MAP NDP frame, MAP Poll Trigger, and MAP Beamforming Report (BFR).

[0076] The MAP setup phase involves exchanging frames (such as MAP Setup Request / Response frames) that perform setup related to MAP.

[0077] MAP data transmission transmits MAP data. MAP trigger frames that trigger MAP data transmission, Data frames that transmit data, and Ack / BlockAck frames are sent and received between nodes.

[0078] 16 to 20 are diagrams showing examples of frame transmission and reception in each phase.

[0079] FIG. 16 is a diagram illustrating an example of transmission and reception of a Beacon frame and a Probe Request / Response frame in the setup phase.

[0080] A Beacon frame is a frame transmitted from an AP (AP#0, AP#1) to notify broadcast information.

[0081] The Probe Request / Response frame is a request / response frame used by a STA to inquire about the presence or absence of an AP.

[0082] FIG. 17 is a diagram showing an example of transmission and reception of association request / response frames in the setup phase.

[0083] Association Request / Response frames are frames in which a STA requests / responds to an AP for a connection relationship.

[0084] FIG. 18 is a diagram illustrating an example of transmission and reception of an Action frame in the setup phase.

[0085] An action frame is a frame used to exchange various information between nodes.

[0086] FIG. 19 is a diagram showing an example of transmission and reception of a MAP NDPA frame, a MAP NDP frame, a MAP Poll Trigger, and a MAP BFR control frame in the measurement phase.

[0087] The MAP NDPA frame is a frame that instructs measurement of CSI and specifies feedback information.

[0088] The MAP NDP frame is transmitted from a specified node following the MAP NDPA frame, and is a frame for measuring CSI at a separately specified node. Figure 19 shows an example in which the MAP NDP is transmitted in the order of AP #0, AP #1, STA #0, STA #1, and STA #2, and CSI measurement is performed at each node. When different MAP schemes are specified for the P20 channel and the S20 channel, as in the first embodiment, AP #0 may instruct that measurements in the MAP NDP be performed separately for the P20 channel and the S20 channel. Each node may be instructed to measure the Acceptable Receiver Interference Level (ARIL), transmission power, and RSSI (Received Signal Strength Indicator) in addition to CSI.

[0089] In FIG. 19, each AP requests collection by sending a MAP Poll Trigger to each STA, and each STA responds with its own measurement results using a MAP BFR, and the measurement results are collected by the AP.

[0090] FIG. 20 is a diagram showing an example of transmission and reception in the MAP setup phase for setting up MAP and in the MAP data transmission.

[0091] The MAP Setup Request (MAP SetupReq) / MAP Setup Response (MAP SetupRes) frames in the MAP setup phase are used to exchange information such as AP settings required for MAP data transmission, ARIL, transmission power, RSSI, and CSI as needed.

[0092] The MAP Trigger in MAP data transmission is a frame that instructs each AP to transmit data and exchanges Data and Ack / BlockAck frames.

[0093] Data transmission is similar to the case of Figure 3 in embodiment 1, in which AP#0 transmits and receives signals to STA#0 on the P20 channel, AP#0 transmits and receives signals to STA#1 on the S20 channel, and AP#1 transmits and receives signals to STA#2 on the P20 channel.

[0094] 15 to 20 show that AP#0 is the Sharing AP and AP#1 is the Shared AP, but this is not limiting. For example, during the setup phase, measurement phase, or / and MAP setup phase, the role of each AP (e.g., Sharing AP / Shared AP) may be undetermined, or there may be no difference in operation between the Sharing AP and the Shared AP (see FIGS. 16 to 18).

[0095] 21 to 26 are diagrams showing configuration examples in which the presence or absence of TPC support is indicated using elements and frames exchanged between nodes in the above sequence.

[0096] FIG. 21 is a diagram showing an example of a configuration based on an existing EHT Operation element as a Next Generation Technology (NGT) Operation element to indicate whether or not TPC is supported.

[0097] Next Generation Technology (NGT) refers to the next generation of the existing EHT, and may be called by other names.

[0098] The NGT Operation element includes an Element ID of 255, an Element ID Extension of 114, NGT Operation Parameters, and NGT Operation Information. Description of fields defined in the EHT Operation element is omitted. Element ID = 255 indicates a configuration with an Element ID Extension, and the Element ID Extension is set to a value indicating a Next Generation Technology (NGT) Operation element (for example, one of the values ​​undefined in the previous standard, such as 114). Element ID Extension = 114 indicates that it is an NGT Operation element. Element ID Extension = 114 is defined as an NGT Operation element. A value other than 114 may be used for the Element ID Extension to define an NGT Operation element. The NGT Operation Parameters include NGT Operation Information Present and TPC Supported Subchannel Information Present.

[0099] NGT Operation Information Present indicates whether the NGT Operation Information field is present. TPC Supported Subchannel Information Present indicates whether the TPC Supported Subchannel Bitmap field is present. If the NGT Operation Information Present indicates that the NGT Operation Information field is present and the TPC Supported Subchannel Information Present indicates that the TPC Supported Subchannel Bitmap field is present, the NGT Operation Information includes the TPC Supported Subchannel Bitmap.

[0100] The TPC Supported Subchannel Bitmap indicates whether each subchannel supports TPC in band units. For example, a bitmap value of "1" indicates that the corresponding subchannel supports TPC. A bitmap value of "0" may indicate that the corresponding subchannel supports TPC. Instead of directly indicating whether TPC is supported, the presence or absence of TPC support may be indicated by other means, for example, by indicating a MAP scheme.

[0101] FIG. 22 is a diagram showing an example of a configuration in which a new element is defined as a TPC Supported Subchannel element with a configuration similar to that of the EHT Operation element to indicate whether or not TPC is supported.

[0102] The TPC Supported Subchannel element includes an Element ID of 255, an Element ID Extension of 114, TPC Supported Subchannel Parameters, and TPC Supported Subchannel Information. Description of fields defined in the EHT Operation element will be omitted. Element ID = 255 indicates a configuration with an Element ID Extension, and the Element ID Extension is set to an undefined value in the previous standard, for example, 114. Element ID Extension = 114 indicates a TPC Supported Subchannel element. Element ID Extension = 114 is defined as a TPC Supported Subchannel element. A value other than 114 may be used for the Element ID Extension to define a TPC Supported Subchannel element. The TPC Supported Subchannel Parameters include TPC Supported Subchannel Information Present and TPC Supported Subchannel Bitmap Present.

[0103] TPC Supported Subchannel Information Present indicates whether the TPC Supported Subchannel Information field is present. TPC Supported Subchannel Bitmap Present indicates whether the TPC Supported Subchannel Bitmap is present. If the TPC Supported Subchannel Information Present indicates the presence of the TPC Supported Subchannel Information field and the TPC Supported Subchannel Bitmap Present indicates the presence of the TPC Supported Subchannel Bitmap, the TPC Supported Subchannel Information includes Channel Width and TPC Supported Subchannel Bitmap.

[0104] The TPC Supported Subchannel Bitmap indicates whether each subchannel supports TPC in units of Channel Width. A bitmap value of "1" indicates that the corresponding subchannel supports TPC. A bitmap value of "0" may indicate that the corresponding subchannel supports TPC. Instead of directly indicating whether TPC is supported, the presence or absence of TPC support may be indicated by other means, for example, by indicating a MAP scheme.

[0105] FIG. 23 is a diagram showing another example of a configuration in which a new element is defined as a TPC Supported Subchannel element with a configuration similar to that of the Supported Channels element to indicate whether or not TPC is supported.

[0106] A TPC Supported Subchannel element includes an Element ID of 245, a First Channel Number, the Number of Channels, and a TPC Supported Subchannel Bitmap. Setting the Element ID to a value undefined in the previous standard, for example, 245, indicates that it is a TPC Supported Subchannel element. Element ID = 245 indicates that it is a TPC Supported Subchannel element. Element ID = 245 is defined as a TPC Supported Subchannel element. A value other than 245 may be used for the Element ID to define a TPC Supported Subchannel element.

[0107] First Channel Number indicates the first channel number within the supported subband. Number of Channels indicates the number of channels.

[0108] The TPC Supported Subchannel Bitmap includes bits equal to the number of channels and indicates whether each channel supports TPC. A bitmap value of "1" indicates that the corresponding subchannel supports TPC. A bitmap value of "0" may also indicate that the corresponding subchannel supports TPC. Instead of directly indicating whether TPC is supported, the presence or absence of TPC support may be indicated by other means, for example, by indicating a MAP scheme.

[0109] 21 to 23 may be included in management frames such as beacon, association request, and probe request frames, depending on the need for notification. Also, TPC support may be indicated in a phase other than the setup phase.

[0110] 24 to 26 are diagrams showing examples of configurations in which TPC support is defined by an Action frame.

[0111] FIG. 24 is a diagram showing an example of a configuration in which a new Category Action frame is defined as a TPC Support Action frame.

[0112] The TPC Support Action Frame includes Category, TPC Support Action, and TPC Support Setup Elements, with Code set to 38. Setting the Category Code in the Action frame to a value undefined in the previous standard, for example, 38, indicates that it is a TPC Support Action frame. Category Code = 38 indicates that it is a TPC Support Action frame. Category Code = 38 is defined as a TPC Support Action frame. A value other than 38 may be used for Code to define a TPC Support Action frame.

[0113] In the TPC Support Action, for example, a TPC Support Setup Request that requests the setting of TPC Support and a TPC Support Setup Report that is a response to the setting request are defined according to the MAP Action field value. MAP Action field value = 0 may be defined as a TPC Support Setup Request, and MAP Action field value = 1 may be defined as a TPC Support Setup Report. Other values ​​may be used in the MAP Action field value to define the TPC Support Setup Request and the TPC Support Setup Report.

[0114] In the case of a TPC Support Setup Request, the TPC Support Setup Elements include Channel Width and TPC Supported Subchannel Bitmap. The TPC Support Setup Elements may be configured from Channel Width and TPC Supported Subchannel Bitmap.

[0115] The TPC Supported Subchannel Bitmap indicates whether each subchannel supports TPC in units of Channel Width. A bitmap value of "1" indicates that the corresponding subchannel supports TPC. A bitmap value of "0" may also indicate that the corresponding subchannel supports TPC. Instead of directly indicating whether TPC is supported, the presence or absence of TPC support may be indicated by other means, for example, by a MAP scheme.

[0116] In the case of the TPC Support Setup Report, the TPC Support Setup Elements include the Status Code.

[0117] The Status Code indicates whether the configuration request was successful.

[0118] FIG. 25 is a diagram showing an example of a configuration in which a TPC Support Action frame is defined as one of the Public Action frames.

[0119] The Public Action frame includes a Category with Code set to 4, a Public Action with Public Action field value set to 47 or 48, and TPC Support Setup Elements. The Category Code is set to Public (=4), and the Public Action field value is set to an undefined value in the previous standard, for example, 47 to indicate a TPC Support Setup Request, or 48 to indicate a TPC Support Setup Report. Public Action = 47 indicates a TPC Support Setup Request, and Public Action = 48 indicates a TPC Support Setup Report. Public Action = 47 is defined as a TPC Support Setup Request, and Public Action = 48 is defined as a TPC Support Setup Report. Other values ​​may be defined for the Public Action field value.

[0120] In the case of a TPC Support Setup Request, the TPC Support Setup Elements include Channel Width and TPC Supported Subchannel Bitmap. The TPC Support Setup Elements may be configured from Channel Width and TPC Supported Subchannel Bitmap.

[0121] The TPC Supported Subchannel Bitmap indicates whether each subchannel supports TPC in units of Channel Width. A bitmap value of "1" indicates that the corresponding subchannel supports TPC. A bitmap value of "0" may also indicate that the corresponding subchannel supports TPC. Instead of directly indicating whether TPC is supported, the presence or absence of TPC support may be indicated by other means, for example, by a MAP scheme.

[0122] In the case of the TPC Support Setup Report, the TPC Support Setup Elements include the Status Code.

[0123] The Status Code indicates whether the configuration request was successful.

[0124] FIG. 26 is a diagram showing an example of a configuration in which a new Category Action frame is defined as an NGT Action frame, and the value of the NGT Action field is further defined as a TPC Supported Subchannel Notification frame.

[0125] An NGT Action frame includes Category with Code set to 38, NGT Action with NGT Action field value set to 1, and TPC Supported Subchannel Notification. Setting the Category Code to an undefined value in the previous standard, for example 38, indicates that it is an NGT Action frame. Category Code = 38 indicates that it is an NGT Action frame. Category Code = 38 is defined as an NGT Action frame. Other values ​​may be defined for Category Code.

[0126] When Category is NGT (Code = 38), for example, an NGT Action field value = 1 in NGT Action indicates that this is a TPC Supported Subchannel Notification that notifies of TPC Support. An NGT Action field value = 1 is defined as a TPC Supported Subchannel Notification. The TPC Supported Subchannel Notification includes Channel Width and TPC Supported Subchannel Bitmap. The TPC Supported Subchannel Notification may be composed of Channel Width and TPC Supported Subchannel Bitmap.

[0127] The TPC Supported Subchannel Bitmap indicates whether each subchannel supports TPC in units of Channel Width. A bitmap value of "1" indicates that the corresponding subchannel supports TPC. A bitmap value of "0" may also indicate that the corresponding subchannel supports TPC. Instead of directly indicating whether TPC is supported, the presence or absence of TPC support may be indicated by other means, for example, by a MAP scheme.

[0128] 24 to 26 show examples in which TPC Support Setup Elements or TPC Supported Subchannel Notification is defined in NGT Action, but they may also be defined in the Operating Mode Notification frame or NGT MIMO Control field, or in other Management frames. Furthermore, they may be named something other than TPC Support Setup Elements or TPC Supported Subchannel Notification.

[0129] According to the fourth embodiment, by notifying the presence or absence of transmission power control for each band using management frames, it becomes possible to control transmission power independently for each band, allowing a higher MCS to be selected and improving system throughput.

[0130] (Fifth Embodiment) The fifth embodiment defines the capability of supporting reception of differences in transmission power between bands.

[0131] The capability definition of the fifth embodiment can be used when performing the transmission power control of the first to third embodiments. Also, the capability definition of the fifth embodiment can be used when using the notification of the fourth embodiment.

[0132] FIG. 27 is a diagram illustrating an example of subfield definitions in the NGT PHY Capabilities Information field. As shown in FIG. 27 , as an extension of the Power Boost Factor Support (IEEE P802.11be / D2.0, Table 9-401k), a range exceeding the existing range [0.5, 2] (corresponding to ±6 dB), for example, [0.1, 10] (corresponding to ±20 dB), is defined. This range is merely an example, and other values ​​may be defined within a range that can be supported for reception. While the transmit power difference was limited to ±6 dB assuming OFDMA transmission, this is not sufficient for use in the capability of the transmit power difference between bands when the transmission scheme, for example, the MAP scheme, differs for each band. However, according to the fifth embodiment, a range exceeding ±6 dB, for example, ±20 dB, can be defined, allowing nodes to perform independent transmit power control for each band.

[0133] Figure 28 is a diagram showing an example of the definition of changing the range of the transmission power difference depending on the RU size. As shown in the example of Figure 28, when the effect of the transmission power difference is small, such as when the RU size is small (e.g., 20 MHz or less), the range of the transmission power difference may be set small (e.g., ±6 dB). When the effect of the transmission power difference is large, such as when the RU size is large (e.g., 40 MHz or more), the range of the transmission power difference may be set large (e.g., ±20 dB). Note that 242-tone in Figure 28 is the number of subcarriers in 20 MHz.

[0134] 29 is a diagram showing an example in which a capability for a range of a transmission power difference is defined in accordance with the SR setting for each band. As shown in the example in FIG. 29, the change range of the transmission power difference may be set small (for example, ±6 dB) without the SR setting, and may be set large (for example, ±20 dB) with the SR setting.

[0135] Furthermore, whether or not transmission or reception of a difference in transmission power between bands is supported may be defined as the Device Class of the Node separately from the Capability.

[0136] Capability and Device Class information is included in management frames such as Beacon frames, Association Request / Response frames, and Probe Request / Response frames, and information is exchanged between terminals.

[0137] According to the fifth embodiment, it is possible to set the difference in transmission power between bands according to the capability of the STA, which makes it possible to select a high MCS and improve the system throughput.

[0138] The transmission power control according to the first to fifth embodiments is applicable to both the downlink and the uplink.

[0139] Although FIG. 1 shows an example of the downlink, the present disclosure can also be used for the uplink as well as the downlink. FIG. 30 is a diagram illustrating the uplink. FIG. 30 shows an example assuming that STA#0 transmits an uplink to AP#0 on the P20 channel and the S20 channel, and STA#1 transmits an uplink to AP#1 on the P20 channel. Here, the P20 channel is C-SR and the S20 channel is C-OFDMA.

[0140] In the uplink, the STA can control the transmission power for each band, just like in the downlink. Furthermore, when the STA reduces the transmission power of a signal transmitted in one band, it can increase the transmission power in another band. The AP can also control the allocation of the band and MAP scheme so that the power of the primary channel is maximized. Since the AP allocates the band and MAP scheme, even in the case of the uplink where the STA controls the transmission power, the AP allocates the band and MAP scheme.

[0141] FIG. 31 is a diagram illustrating an example of transmission power control when the MAP scheme differs for each band in the uplink.

[0142] If STA#0 and STA#1 reduce the transmission power of signals transmitted on the P20 channel, STA#0 can increase the transmission power of signals transmitted on the S20 channel. This reduces the received power (interference) of signals received on the P20 channel from STA#1 at AP#0 and the received power (interference) of signals received on the P20 channel from STA#0 at AP#1, while increasing the received power of signals received on the S20 channel from STA#0 at AP#0. This allows STA# to select a higher MCS for signals transmitted on the S20 channel, thereby improving the throughput of the communication system.

[0143] The first to fifth embodiments can be combined as appropriate. For example, transmission power control can be performed using both the MAP scheme (first embodiment) and the presence or absence of SR (second embodiment). For example, when performing transmission power control using the MAP scheme of the first example, the notification of the fourth embodiment can be used. For example, transmission power control can be performed using both the MAP scheme (first embodiment) and the presence or absence of reception support (fifth embodiment). For example, transmission power control can be performed using three factors: the MAP scheme (first embodiment), the presence or absence of SR (second embodiment), and the presence or absence of reception support (fifth embodiment).

[0144] The wireless communication system according to the present embodiment may include, for example, a plurality of APs 100 and a plurality of STAs 200. The AP 100 may have, for example, both the functions of a Sharing AP and a Shared AP, or may have the functions of only one of them.

[0145] Fig. 32 is a block diagram showing a partial configuration example of an AP 100 according to an embodiment of the present disclosure. Fig. 33 is a block diagram showing a partial configuration example of an STA 200 according to an embodiment of the present disclosure.

[0146] The AP 100 shown in Fig. 32 is an example of a communication device. In the AP 100 shown in Fig. 32, a wireless transceiver 105 (e.g., corresponding to a transceiver circuit) transmits frames to other communication devices (e.g., STA 200) and receives frames from other communication devices (e.g., STA 200). A control unit 101 (e.g., corresponding to a control circuit) controls cooperative communication (e.g., control of transmission power) based on the MAP scheme of the frame.

[0147] STA200 shown in Fig. 33 is an example of a communication device. In STA200 shown in Fig. 33, a control unit 204 (e.g., equivalent to a control circuit) receives frames from multiple other communication devices (e.g., AP100) and controls cooperative communication (e.g., control of transmission power).

[0148] Fig. 34 is a block diagram showing an example configuration of an AP 100 according to the present embodiment 1. The AP 100 shown in Fig. 34 may include, for example, a control unit 101, a STA-directed control signal generation unit 102, an AP-directed control signal generation unit 103, a transmission signal generation unit 104, a wireless transmission / reception unit 105, and a received signal demodulation / decoding unit 106.

[0149] The control unit 101 may, for example, control the setting of a transmission frame (or signal) including a MAP Trigger frame, etc. For example, when the AP 100 is a Sharing AP, the control unit 101 may control the generation of a control signal (for example, a MAP Trigger frame) for another AP 100 (for example, a Shared AP).

[0150] The transmission frame may have any one of the frame configurations described above.

[0151] The control unit 101 may also set control information for the STAs 200 or other APs 100, for example. For example, the control unit 101 may set resource allocation information and scheduling information such as MCS for each STA 200. The control unit 101 may also determine parameters (e.g., parameters related to cooperative communication) related to transmission control (e.g., control of cooperative communication) based on information input from the received signal demodulation and decoding unit 106 (e.g., control information notified from the Sharing AP to the Shared AP). The control unit 101 may output control information including the determined transmission control parameters to the STA-directed control signal generation unit 102 and the AP-directed control signal generation unit 103, for example.

[0152] Furthermore, the control unit 101 may, for example, control cooperative communication for the STA 200. For example, the control unit 101 controls transmission of configuration information related to the configuration of cooperative communication to the STA 200. The configuration information may include information used for an event report (an example of feedback information) from the STA 200. For example, the control unit 101 controls transmission of information (e.g., notification information) to the STA 200 requesting an event report from the STA 200. For example, the control unit 101 controls transmission of a measurement signal to the STA 200 to measure communication quality. For example, the control unit 101 controls switching of the MAP scheme based on an event report received from the STA 200.

[0153] The STA-directed control signal generating unit 102 may, for example, generate a control signal (e.g., a trigger frame) for the STA 200 and output the generated control signal to the transmission signal generating unit 104. Furthermore, the STA-directed control signal generating unit 102 may generate various signals for the STA 200 under the control of the control unit 101 and output the generated signals to the transmission signal generating unit 104.

[0154] The AP-directed control signal generating unit 103 may generate, for example, a control signal (for example, a MAP Trigger frame) for the AP 100. For example, the AP-directed control signal generating unit 103 may generate the control signal based on control information input from the control unit 101 and information input from the received signal demodulation and decoding unit 106.

[0155] The transmission signal generating unit 104 may perform transmission processing on, for example, a control signal, or data and an ACK (ACKnowledge) / NACK (Negative ACKnowledge) input from the STA-directed control signal generating unit 102 or the AP-directed control signal generating unit 103, to generate a wireless frame (transmission signal). The transmission signal generating unit 104 outputs the generated transmission signal to the wireless transmitting / receiving unit 105.

[0156] The radio transmission / reception unit 105 performs radio transmission processing such as D / A (Digital / Analog) conversion and up-conversion to a carrier frequency on the transmission signal input from the transmission signal generation unit 104, and transmits the signal after radio transmission processing via an antenna.

[0157] For example, when the AP 100 receives an uplink signal transmitted from the STA 200 or a control signal transmitted from another AP 100, the AP 100 may operate as follows.

[0158] A radio signal received via an antenna is input to the radio transmission / reception unit 105. The radio transmission / reception unit 105 performs radio reception processing, such as down-conversion of the carrier frequency, on the received radio signal, and outputs the signal after the radio reception processing to the received signal demodulation / decoding unit 106.

[0159] The received signal demodulation and decoding unit 106 may, for example, perform processing such as autocorrelation processing on the signal input from the wireless transceiver unit 105 and extract the received wireless frame. The received signal demodulation and decoding unit 106 may also decode and demodulate, for example, an uplink signal from the STA 200 (e.g., a response signal, feedback information) or a control signal from another AP 100 (e.g., a MAP Trigger frame) contained in the extracted wireless frame. The received signal demodulation and decoding unit 106 may, for example, output the demodulated control signal to the control unit 101, the STA-directed control signal generation unit 102, and the AP-directed control signal generation unit 103.

[0160] Fig. 35 is a block diagram showing an example configuration of STA 200 according to Embodiment 1. STA 200 shown in Fig. 35 may include, for example, a radio transmission / reception unit 201, a received signal demodulation / decoding unit 202, a transmission signal generation unit 203, and a control unit 204.

[0161] The wireless transceiver unit 201 receives, for example, a signal transmitted from the AP 100 via an antenna, performs wireless reception processing such as down-conversion and A / D (Analog / Digital) conversion on the received signal, and outputs the signal after the wireless reception processing to the received signal demodulation and decoding unit 202. The wireless transceiver unit 201 may also perform wireless transmission processing such as D / A conversion and up-conversion to a carrier frequency on a signal input from the transmission signal generation unit 203, and transmit the signal after the wireless transmission processing via the antenna.

[0162] The received signal demodulation and decoding unit 202 may, for example, perform processing such as autocorrelation processing on the signal input from the wireless transmission / reception unit 201 to extract the received wireless frame. The received signal demodulation and decoding unit 202 may, for example, demodulate and decode a control signal (e.g., a trigger frame) included in the extracted wireless frame to obtain an uplink transmission control parameter. The received signal demodulation and decoding unit 202 may, for example, output the obtained uplink transmission control parameter to the transmission signal generation unit 203.

[0163] The received signal demodulation and decoding unit 202 outputs the received signal (for example, NDP) to the control unit 204 .

[0164] The transmission signal generation unit 203 may perform transmission signal processing on an uplink signal (e.g., a signal including feedback information) based on the uplink transmission control parameters input from the reception signal demodulation and decoding unit 202, and generate a radio frame (transmission signal). The transmission signal generation unit 203 outputs the generated transmission signal to the radio transmission and reception unit 201, for example.

[0165] The control unit 204 controls, for example, cooperative communication (e.g., MAP scheme). For example, the control unit 204 measures measurement values ​​such as CSI and / or RSSI based on a received signal (e.g., NDP). The control unit 204 generates feedback information regarding switching of the MAP scheme based on the measurement values.

[0166] (Other embodiments) In each of the above-mentioned embodiments, an example of the configuration of each frame has been described, but the information to be notified is not limited to the information shown in the above-mentioned embodiments, and for example, other information may be added, or at least a part of the defined information may be deleted.

[0167] Furthermore, the configurations of frames, elements, fields, subfields, etc. in the above-described embodiments are merely examples, and the present disclosure is not limited to the above-described examples. For example, at least one element may be omitted from the above-described frame configuration, or an element not included in the above-described frame configuration may be included in the above-described frame configuration.

[0168] Furthermore, in each of the above-described embodiments, the AP that instructs cooperative communication and the AP that is instructed to perform cooperative communication are described as "Sharing AP" and "Shared AP," respectively, but this is not limited to these terms and other terms may be used.

[0169] Furthermore, although the above-described embodiments have been described based on the IEEE 802.11be format as a non-limiting example, the format to which an embodiment of the present disclosure can be applied is not limited to the IEEE 802.11be format. An embodiment of the present disclosure may be applied to, for example, IEEE 802.11bd (NGV (Next Generation V2X)), a next-generation standard of IEEE 802.11p, which is an in-vehicle standard.

[0170] The present disclosure can be realized by software, hardware, or software in conjunction with hardware. Each functional block used in the description of the above embodiments may be partially or entirely realized as an LSI, which is an integrated circuit, and each process described in the above embodiments may be partially or entirely controlled by a single LSI or a combination of LSIs. The LSI may be composed of individual chips, or may be composed of a single chip that includes some or all of the functional blocks. The LSI may have data input and output. Depending on the degree of integration, the LSI may also be called an IC, system LSI, super LSI, or ultra LSI.

[0171] The integrated circuit method is not limited to LSI, and may be realized by a dedicated circuit, a general-purpose processor, or a dedicated processor. Also, a field programmable gate array (FPGA) that can be programmed after LSI manufacturing, or a reconfigurable processor that can reconfigure the connections and settings of circuit cells within the LSI, may be used. The present disclosure may be realized as digital processing or analog processing.

[0172] Furthermore, if an integrated circuit technology that can replace LSI emerges due to advances in semiconductor technology or other derivative technologies, it is natural that such technology may be used to integrate functional blocks. The application of biotechnology, etc. is also a possibility.

[0173] The present disclosure may be implemented in any type of apparatus, device, or system (collectively referred to as a communications apparatus) that has a communications function. The communications apparatus may include a radio transceiver and processing / control circuitry. The radio transceiver may include a receiver and a transmitter, or both functions. The radio transceiver (transmitter and receiver) may include a radio frequency (RF) module and one or more antennas. The RF module may include an amplifier, an RF modulator / demodulator, or the like. Non-limiting examples of communication devices include telephones (e.g., cell phones, smartphones), tablets, personal computers (PCs) (e.g., laptops, desktops, notebooks), cameras (e.g., digital still / video cameras), digital players (e.g., digital audio / video players), wearable devices (e.g., wearable cameras, smartwatches, tracking devices), game consoles, digital book readers, telehealth / telemedicine devices, communication-enabled vehicles or mobile transportation (e.g., cars, airplanes, ships), and combinations of the above devices.

[0174] The communication devices are not limited to portable or mobile devices, but also include any kind of non-portable or fixed equipment, devices, and systems, such as smart home devices (such as home appliances, lighting equipment, smart meters or measuring devices, control panels, etc.), vending machines, and any other "things" that may exist on an IoT (Internet of Things) network.

[0175] Communications include data communications via cellular systems, wireless LAN systems, communication satellite systems, and the like, as well as data communications via combinations of these.

[0176] A communications apparatus also includes devices such as controllers and sensors connected or coupled to a communications device that performs the communications functions described in this disclosure, such as controllers and sensors that generate control and data signals used by the communications device to perform the communications functions of the communications apparatus.

[0177] The communication apparatus also includes infrastructure facilities, such as base stations, access points, and any other apparatus, device, or system that communicates with or controls the various apparatuses listed above, but are not limited to these.

[0178] A communication device according to an embodiment of the present disclosure includes a control circuit that performs independent transmission power control for each of a plurality of bands, and a transceiver circuit that transmits signals using the plurality of bands.

[0179] In one embodiment of the present disclosure, the control circuit performs transmission power control corresponding to a MAP (Multi Access Point) Scheme for each band.

[0180] In one embodiment of the present disclosure, transmission power control is performed according to whether or not SR (Spatial Reuse) operation is performed for each band.

[0181] In one embodiment of the present disclosure, transmission power control is performed in accordance with the Beamformed setting for each band.

[0182] In one embodiment of the present disclosure, the presence or absence of transmission power control for each band is notified by management frames.

[0183] In one embodiment of the present disclosure, the Management frames are Beacon, Association Request / Response, Probe Request / Response, or Action frames.

[0184] In one embodiment of the present disclosure, the control circuit controls the transmission power depending on whether or not there is reception support for the difference in transmission power between terminals.

[0185] In one embodiment of the present disclosure, the presence or absence of reception support is defined by a capability included in a beacon, an association request / response, a probe request / response, or an action frame.

[0186] A communication method according to an embodiment of the present disclosure performs independent transmission power control for each of a plurality of bands and transmits signals using the plurality of bands.

[0187] The disclosures of the specification, drawings and abstract contained in Japanese Patent Application No. 2022-115606, filed on July 20, 2022, are incorporated herein by reference in their entirety.

[0188] One embodiment of the present disclosure is useful in wireless communication systems.

[0189] 100 AP 101, 204 Control unit 102 STA-directed control signal generation unit 103 AP-directed control signal generation unit 104, 203 Transmission signal generation unit 105, 201 Radio transmission / reception unit 106, 202 Received signal demodulation / decoding unit 200 STA

Claims

1. A control circuit that performs transmit power control corresponding to each of the multiple frequency bands, A transmitting and receiving circuit that transmits signals using the aforementioned multiple bandwidths, A communication device equipped with the following.

2. The signal is transmitted at the same timing for the multiple bands using the transmission power corresponding to each band determined based on the transmission power control. The communication device according to claim 1.

3. The information regarding the aforementioned transmission power control is transmitted in a Management frame. The communication device according to claim 1.

4. The information regarding the transmission power control is transmitted in one of the following frames: Beacon, Association Request / Response, Probe Request / Response, or Action frame. The communication device according to claim 1.

5. Any of the frames exist prior to the measurement phase, The communication device according to claim 4.

6. Of the aforementioned multiple bandwidths, information regarding transmission power control in the first bandwidth and information regarding transmission power control in the second bandwidth are transmitted to the terminal. The communication device according to claim 1.

7. Of the aforementioned multiple bandwidths, the transmission power in the first bandwidth is greater than the transmission power in the second bandwidth. The communication device according to claim 1.

8. The communication device transmits information relating to the transmission power control corresponding to each bandwidth, and information relating to the transmission power control corresponding to each bandwidth in a communication device different from the communication device. The communication device according to claim 7.

9. The communication device receives information regarding transmit power control corresponding to at least one bandwidth in a communication device different from the aforementioned communication device. Based on the above information, the transmission power control is performed. The communication device according to claim 1.

10. Transmit power control is performed for each of the multiple bandwidths that make up the band. Signal detection using the aforementioned multiple bandwidths, Communication method.