Communication apparatus and communication method

Abstract

A communication device for improving throughput of a communication system, the communication device comprising: a control circuit for performing transmission power control corresponding to a transmission scheme for each of a plurality of frequency bands; and a transmission / reception circuit that transmits a signal using the plurality of frequency bands.

Description

Technical Field

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

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

[0003] Prior art literature

[0004] Non-patent literature

[0005] Non-patent document 1: IEEE 802.11-20 / 1935r66, Compendium of straw polls and potential changes to the Specification Framework Document-Part 2

[0006] Non-patent document 2: IEEE 802.11-20 / 1399r2, On Joint C-SR and C-OFDMA M-AP Transmission Summary of the invention

[0007] Transmission power control for cooperative communication in wireless communications such as wireless LANs has not yet been fully studied.

[0008] The non-limiting embodiments of the present disclosure contribute to providing a wireless communication apparatus and a wireless communication method capable of performing appropriate transmission power control in coordinated communications.

[0010] A communication device according to an embodiment of the present disclosure includes: a control circuit that performs transmission power control corresponding to a transmission scheme for each frequency band constituting a plurality of frequency bands; and a transceiver circuit that transmits a signal using the plurality of frequency bands.

[0011] It should be noted that these general or specific aspects may be implemented by a system, an apparatus, a method, an integrated circuit, a computer program or a recording medium, or may be implemented by any combination of systems, apparatuses, methods, integrated circuits, computer programs and recording media.

[0012] According to one embodiment of the present disclosure, appropriate transmission power control can be performed in coordinated communication.

[0013] More advantages and effects of an embodiment of the present disclosure will be explained through the description and drawings. These advantages and / or effects are provided by several 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a diagram showing an example of classification of a MAP (Multi-Access Point) scheme.

[0015] Figure 2 is a diagram showing an example of transmission power spectrum density.

[0016] Figure 3 This is a diagram showing an example of transmission power control when the MAP scheme is different for each frequency band.

[0017] Figure 4 This is a diagram showing another example of transmission power control in a case where the MAP scheme differs for each frequency band.

[0018] Figure 5 This is a diagram showing still another example of transmission power control in a case where the MAP scheme differs for each frequency band.

[0019] Figure 6 This is a diagram showing a method of specifying a MAP scheme using information of common information (Common Info).

[0020] Figure 7 This is a diagram showing a method of specifying a MAP scheme using information of each AP information (Per AP Info).

[0021] Figure 8 This is a diagram showing a method of specifying a MAP scheme by information of each STA information (Per STA Info) in each AP information.

[0022] Fig. 9 This is a diagram showing a method of specifying a MAP scheme using information of each STA information.

[0023] Fig.10 This is a diagram showing a method of switching the format specified by the MAP scheme.

[0024] Fig.11 This is a diagram showing an example of transmission power control when the SR (Spatial Reuse) operation differs for each frequency band.

[0025] Fig.12 This is a diagram showing another example of transmission power control in a case where the SR operation differs for each frequency band.

[0026] Fig.13 This is a diagram showing still another example of transmission power control in a case where the SR operation differs for each frequency band.

[0027] Fig.14 This is a diagram showing an example of transmission power control when the beamforming operation is different for each frequency band.

[0028] Fig.15 This is a diagram showing the overall sequence related to MAP communication.

[0029] Fig.16 The diagram shows an example of transmission and reception of a beacon frame and a probe request / response frame in the setup phase.

[0030] Fig.17 This is a diagram showing an example of transmission and reception of Association Request / Response frames in the setup phase.

[0031] Fig.18 This is a diagram showing an example of transmission and reception of an action frame in the setting phase.

[0032] Fig.19 This diagram shows an example of sending and receiving control frames such as NDPA (Null Data Physical layer protocol data unit Announcement) frame for MAP in the measurement phase, NDP frame for MAP, MAP polling trigger (Poll Trigger), MAP BFR (Beamforming Report), etc.

[0033] Fig. 20 It is a diagram showing a MAP setting phase for performing settings related to MAP and a transmission and reception example in MAP data transmission.

[0034] Fig.21 This is a diagram showing a structure based on the existing EHT operation element as an NGT (Next Generation Technology) operation element.

[0035] Fig. 22 This diagram shows a structure in which a new element is defined as a subchannel element supporting transmission power control (TPC (Transmission Power Control) Supported Subchannel element) with a structure similar to that of the EHT operation element.

[0036] Fig.23 This is a diagram showing a structure in which a new element is defined as a sub-channel element supporting TPC in a structure similar to that of a supported channel element (Supported Channels element).

[0037] Fig.24 This is a diagram showing the structure of an action frame in which a new category (Category) is defined as a TPC support action frame (TPC Support Action frame).

[0038] Fig.25 This is a diagram showing a structure in which a TPC support action frame is defined using a public action frame.

[0039] Fig.26 This is a diagram showing a structure in which a new type of action frame is defined as an NGT action frame, and a value of an NGT action field is further defined as a TPC Supported Subchannel Notification frame.

[0040] Fig. 27 This is a diagram showing a definition example of subfields of the NGT EHT PHY Capabilities Information field.

[0041] Fig.28 This is a diagram showing an example of defining a range in which the transmission power difference is changed according to the RU size.

[0042] Fig.29 This is a diagram showing an example of the capability of defining the range of the transmission power difference corresponding to the SR setting for each frequency band.

[0043] Fig.30This is a diagram for explaining the situation of uplink.

[0044] Fig.31 This is a diagram showing an example of transmission power control in the uplink when the MAP scheme differs for each frequency band.

[0045] Fig.32 This is a block diagram showing a structural example of a part of an AP according to an embodiment of the present disclosure.

[0046] Fig.33 This is a block diagram showing a configuration example of a part of a STA according to an embodiment of the present disclosure.

[0047] Fig.34 This is a block diagram showing a structural example of an AP.

[0048] Fig.35 This is a block diagram showing a structural example of STA. DETAILED DESCRIPTION

[0049] Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the drawings. In addition, the embodiment described below is an example, and the present disclosure is not limited to the following embodiment.

[0050] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the accompanying drawings as appropriate. However, sometimes an overly detailed description may be omitted. For example, sometimes a detailed description of a well-known matter or a repeated description of a substantially identical structure may be omitted. The purpose is to avoid the following description from being unnecessarily lengthy and to make it easy for those skilled in the art to understand.

[0051] In addition, the drawings and the following description are provided for the purpose of enabling those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0052] In IEEE 802.11be or standards for the next generation, the application of multi-AP (Multi-AP) (hereinafter referred to as "MAP") coordination (hereinafter referred to as "coordinated communication") in which multiple access points (also called "base stations", hereinafter referred to as "AP (Access Point)") coordinate to send and receive data with each terminal (also called "non-AP STA (non-APSTA, Station)", hereinafter referred to as "STA") is studied.

[0053] For coordinated communication in IEEE 802.11be, a plurality of MAP coordinated communication schemes (hereinafter referred to as "MAP schemes") have been studied. For example, there is the following MAP scheme (for example, refer to Non-Patent Document 1).

[0054] Coordinated Spatial Reuse (hereinafter referred to as "C-SR")

[0055] Coordinated Orthogonal Frequency Division Multiple Access (C-OFDMA)

[0056] Coordinated Beamforming (hereinafter referred to as "C-BF")

[0057] Joint Transmissions (hereinafter referred to as "JT")

[0058] In this specification, JT is defined as a method that includes sending exactly the same signal from multiple coordinated APs and a distributed multi-user multiple input multiple output (Multi-User Multi-Input Multi-Output: Distributed MU-MIMO) (hereinafter referred to as "D-MIMO") method that sends different transmission streams from multiple coordinated APs. In addition, JT is sometimes defined as a method that does not include D-MIMO and sends exactly the same signal from multiple coordinated APs.

[0059] It should be noted that the MAP scheme may be used interchangeably with other terms such as “communication type” or “MAP type”.

[0060] It is also known that system throughput and frequency utilization efficiency can be improved by using C-SR and C-OFDMA in combination (for example, refer to Non-Patent Document 2).

[0061] As described in Non-Patent Document 2, when the MAP scheme differs for each frequency band, it is conceivable that the transmission power control (TPC: Transmission Power Control) method differs for each frequency band, but the control method has not yet been determined.

[0062] For example, when the transmission power of other frequency bands (for example, C-OFDMA or JT) is reduced in conjunction with the transmission power control of a part of the frequency band (for example, through C-SR), the performance of other frequency bands may sometimes deteriorate and the selectable modulation and coding scheme (MCS) value may become smaller, thereby reducing the throughput of the communication system.

[0063] In the embodiment of the present disclosure, for transmission in multiple frequency bands, different transmission power controls are performed for each frequency band.

[0064] Figure 1 1 is a diagram showing an example of differentiating MAP schemes. In this example, the differentiating MAP schemes are set to two schemes: C-SR and C-OFDMA. Figure 1 In the example, STA#0 and STA#2 are located in the C-SR area, and STA#1 is located in the C-OFDMA area. Figure 1 , 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 on STA#0 and C-OFDMA on STA#1. AP#1 performs C-SR on STA#2.

[0065] Figure 2 Yes means Figure 1 A diagram showing an example of transmission power spectral density (PSD: Power Spectral Density) of AP#0 and AP#1 in the example shown.

[0066] AP#0 transmits to STA#0 using MCS#X in the primary 20 MHz (P20) channel, and transmits to STA#1 using MCS#Y in the secondary 20 MHz (S20) channel.

[0067] AP#1 transmits to STA#2 using MCS#Z in the primary 20 MHz (P20) channel and does not transmit in the secondary 20 MHz (S20) channel.

[0068] Here, #X, #Y, and #Z represent the index of the MCS. If it is IEEE 802.11be, the value of the index is 0 to 15.

[0069] STA#0 and STA#2 operate using C-SR, so AP#0 and AP#1 transmit on the same P20 channel. STA#1 operates using C-OFDMA, so AP#0 to which STA#1 is connected transmits on the S20 channel instead of AP#1.

[0070] Although the term "band" is used in the following description, the term may be replaced by a resource unit (RU), a channel, a subchannel, or a subband.

[0071] like Figure 2As shown in FIG. 1 , it is assumed that even when the MAP scheme is different for each frequency band, the AP still transmits at the same transmission power in all frequency bands. As a result, if the AP reduces the transmission power of other frequency bands (such as C-OFDMA or JT) in conjunction with the transmission power control of some frequency bands (for example, through C-SR), the performance of other frequency bands will deteriorate, the selectable MCS value will become smaller, and the throughput will decrease.

[0072] In contrast, the AP can select a high MCS value by performing different transmission power controls according to the transmission scheme for each frequency band, such as the MAP scheme, thereby improving throughput.

[0073] IEEE 802.11be has a function of power boosting per RU in OFDMA transmission, but the power boost range is limited to ±6 dB. This function assumes OFDMA transmission and does not assume that the transmission scheme, such as MAP scheme, differs per frequency band.

[0074] The present disclosure performs transmission power control corresponding to the transmission scheme for each frequency band constituting a plurality of frequency bands, thereby enabling selection of a high MCS value, thereby improving throughput.

[0075] (Implementation Method 1)

[0076] In Embodiment 1, as an example of performing different transmission power controls for each frequency band, the AP performs transmission power control corresponding to the MAP scheme for each frequency band.

[0077] Figure 3 It means in Figure 1 FIG. 1 is a diagram showing an example of transmission power control in a network in which the MAP scheme differs by frequency band. Figure 3 As shown in FIG. 1 , for example, C-SR is defined as a MAP scheme with transmit power control, and C-SR and other schemes perform transmit power control independently of each other. Figure 3 In the example shown, for the P20 channel, both AP#0 and AP#1 use C-SR to perform transmit power control, but for the S20 channel, control is performed independently of the P20 channel, for example, AP#0 does not perform transmit power control but maintains the transmit power. In addition, in C-SR, different transmit power controls can be performed for each frequency band according to the difference in C-SR control type or interference conditions.

[0078] according to Figure 3 In the example of transmission power control, the transmission power of the signal sent by the AP will not decrease due to the influence of the transmission power control of other frequency bands, so the throughput will not decrease.

[0079] Figure 4 FIG. 1 is a diagram showing another example of transmission power control in the case where the MAP scheme is different for each frequency band. Figure 4 As another example shown, the transmission power of other frequency bands is changed in accordance with the change of the transmission power of the frequency band for which the transmission power control is performed. For example, when the transmission power is reduced in a part of the frequency band, the transmission power can be increased in other frequency bands. The transmission power can also be adjusted between frequency bands in such a way that the total transmission power is constant.

[0080] Although in Figure 3 In the example, the S20 channel is not subjected to transmit power control, but according to Figure 4 In the example of transmission power control, when a signal is sent in the S20 channel, the transmission power of the signal sent in the P20 channel (other frequency band) will be reduced. In this case, AP#0 will increase the transmission power of the signal sent in the S20 channel, thereby effectively using the overall transmission power of the transmitter.

[0081] Figure 5 FIG. 1 is a diagram showing another example of transmission power control when the MAP scheme differs by frequency band. Figure 5 In another example shown, the AP allocates the frequency band and MAP scheme to each STA and controls the signal transmitted in the main channel in such a way that the transmission power is maximized. Figure 5 In this way, each AP allocates the C-OFMDA operation that does not perform transmission power control to the primary channel, and allocates the C-SR that performs transmission power control to the secondary channel.

[0082] exist Figure 5 In the example, AP#0 uses MCS#Y+ (for example, a MCS greater than MCS#Y) to send a signal to STA#1 in the primary 20MHz (P20) channel, and uses MCS#X to send a signal to STA#0 in the secondary 20MHz (S20) channel. AP#1 does not send in the primary 20MHz (P20) channel, but uses MCS#Z to send a signal to STA#2 in the secondary 20MHz (S20) channel.

[0083] exist Figure 5 In the example of transmit power control, AP#0 allocates C-SR with transmit power control to S20 channel and C-OFDMA without transmit power control to P20 channel. When a signal is sent in S20 channel (other frequency band), the transmit power is increased when the transmit power is reduced by transmit power control.

[0084] Although in Figure 4In the transmission power control example of FIG. 1 , the power of the signal transmitted in the sub-channel is greater than the power of the signal transmitted in the main channel, but according to Figure 5 In the transmission power control example, by increasing the transmission power of the signal sent by AP#0 in the main channel, the reception performance of the preamble code sent in the main channel is improved, thereby improving the throughput.

[0085] use Figure 6 to Figure 10 An example of a method of specifying a MAP scheme for each frequency band will be described. Figure 6 to Figure 10 The frame may also be a trigger frame for MAP (for example, MAP trigger frame (Trigger frame)).

[0086] Figure 6 is a diagram showing a method in which a MAP scheme is specified by information of general information. Figure 6 As shown, the frame includes common information and information about the number of APs and each AP. The common information includes MAP scheme and MAP scheme dependent common information (MAP scheme dependent common Info). The MAP scheme includes the number of APs (Number of APs) and the number of APs subfield (AP#1, AP#2,...). The subfield of each AP includes the number of RUs (Number of RUs) and the number of RUs subfield (RU#1, RU#2,...). The information about each AP includes the number of RUs and MAP scheme dependent information (MAP scheme dependent Info). The MAP scheme dependent information includes information elements corresponding to the MAP scheme contained in the subfields (RU#1, RU#2,...) of each RU. Figure 6 The diagram shows examples of information elements such as C-SR Type 1, C-SR Type 2, C-SR Type 3, JT, D-MIMO, CBF, and C-OFDMA.

[0087] The MAP scheme in the general information indicates the number of APs or all APs. In the subfield of each RU in the MAP scheme, the MAP scheme of each RU is indicated. Here, the RU can also be defined as a channel or a subchannel. The MAP scheme-dependent general information and the MAP scheme-dependent information contain information corresponding to the MAP scheme (for example, information on transmit power control). For example, the MAP scheme is Figure 6 As shown in the table on the lower left, information related to the MAP scheme and the MAP scheme-dependent common information may be determined corresponding to each index.

[0088] For example, you can Figure 6As shown in the table on the lower left, corresponding to each index, the correspondence between the MAP scheme and the information elements in the MAP scheme dependency information is determined together with the MAP scheme, and other tables can also be used to specify the correspondence between the MAP scheme and the information elements. Other tables can be determined in advance, and other methods can be used to notify other tables.

[0089] General information about MAP schemes and MAP scheme dependencies can be found as follows: Figure 6 As in the table on the lower left, the MAP scheme and the MAP scheme dependent common information are specified by corresponding to the index, and other tables can be used to specify the correspondence between the MAP scheme and the MAP scheme dependent common information. Other tables can be determined in advance, and other methods can be used to notify other tables.

[0090] Figure 7 FIG. 1 is a diagram showing a method in which a MAP scheme is specified by information of each AP. Figure 7 As shown, the frame includes information about each AP, and includes information about a MAP scheme and the number of RUs that depend on the MAP scheme.

[0091] In the MAP scheme, the number of RUs of the AP and the number of RUs subfield (RU#1, RU#2, ...) are included. RU#1, RU#2, ... indicate the MAP scheme of each RU. Each MAP scheme dependency information is composed of elements corresponding to the MAP scheme indicated by RU#1, RU#2, .... The definition of the MAP scheme or the correspondence between the MAP scheme and the information elements in the MAP scheme dependency information can also be described in detail. Figure 6 The same situation is also defined for each index.

[0092] Figure 8 FIG. 1 is a diagram showing a method in which a MAP scheme is specified by information of each STA information in each AP information. Figure 8 As shown in FIG. 1 , the frame includes common information (Common Info) and information about each AP (information about each AP). The common information includes the number of STAs connected to each AP and the MAP scheme list (scheme list). Figure 8 As shown, the MAP scheme list is composed of a plurality of MAP scheme elements. Each MAP scheme element includes a MAP scheme element value corresponding to a MAP scheme element variant. Figure 8Indicates that as a MAP scheme list, MAP scheme element 1 contains MAP scheme element value = 0 (C-SR type 1), and MAP scheme element 2 contains MAP scheme element value = 3 (C-OFDMA), constituting an example of a MAP scheme list containing C-SR type 1 and C-OFDMA. Other MAP scheme element values ​​can also be represented. In each AP information, the number of RUs and the number of STAs contain each STA information (information for each STA). In each STA information, MAP scheme indexes (scheme Indexes) and MAP scheme dependent information (MAP scheme Dependent Info) of the number of RUs are contained. In the MAP scheme index, the number of RUs of MAP scheme indexes are contained.

[0093] A MAP scheme is specified according to each MAP scheme element. Alternatively, each MAP scheme element may be defined by associating a MAP scheme element value with a MAP scheme.

[0094] The number of RUs in each AP information is used to specify the number of MAP scheme indexes or MAP scheme dependent information contained in each STA information.

[0095] The MAP scheme index indicates the index of the MAP scheme element defined in the MAP scheme list. Figure 8 As shown in the table of MAP scheme index variants (scheme Index variant), the correspondence between the MAP scheme index and the MAP scheme element is defined, for example, the correspondence is established in the following manner.

[0096] MAP Scheme Index Variant = MAP Scheme Element (MAP Scheme Index value + 1)

[0097] The MAP scheme dependency information is composed of elements corresponding to the MAP scheme indicated by the MAP scheme index. The MAP scheme dependency information includes information elements corresponding to the MAP scheme of each RU.

[0098] Fig. 9 FIG. 1 is a diagram showing a method in which a MAP scheme is specified by information of each STA. Fig. 9 As shown, in the frame, the number of STAs and the STA information are included. In each STA information, the MAP scheme and the MAP scheme dependency information of the number of RUs are included. In the MAP scheme, the number of RUs and the indication of the RU number of MAP schemes (RU#1, RU#2, ...) are included. Each MAP scheme dependency information is composed of elements corresponding to the MAP schemes indicated by RU#1, RU#2, ....

[0099] Fig.10FIG. 4 is a diagram showing a method of switching the format specified by the MAP scheme. Fig.10 As shown, the frame includes general information, including the MAP format type (Format Type).

[0100] According to the MAP format type, switch the format specified by the MAP scheme. Fig.10 As shown in the table on the lower left, corresponding to the MAP Format Type value, switch as follows Figure 6 to Figure 9 The specified method is shown. Fig.10 The example is an example of a frame in which the MAP format type value is set to 0 and the designation method of including the MAP scheme in the general information is selected.

[0101] As described above, according to Embodiment 1, the AP performs transmission power control corresponding to the MAP scheme for each frequency band, thereby being able to select a higher MCS, thereby improving the throughput of the communication system.

[0102] (Implementation Method 2)

[0103] In Embodiment 2, as an example of performing different transmit power controls for each frequency band, the AP performs transmit power control depending on the presence or absence of a spatial reuse (SR) operation for each frequency band.

[0104] Fig.11 This is a diagram showing an example of transmission power control when the SR action differs by frequency band. AP#0 uses the P20 channel and the S20 channel for OFDMA multiplexing, and allocates the P20 channel and the S20 channel to STA#0 and STA#1, respectively. AP#1 sets the P20 channel to SR action and allocates it to STA#2, and sets the S20 channel to non-SR action.

[0105] AP#0 performs SR action in the P20 channel and suppresses the transmission power of the signal sent by AP#0 in the P20 channel to suppress interference with STA#2. On the other hand, the transmission power of the signal sent by AP#0 in the S20 channel is made independent of the transmission power control of the P20 channel, for example, no transmission power control is performed. Fig.11 This shows an example in which the transmission power of the signal transmitted by AP#1 in the P20 channel is maintained and no transmission power control is performed. Fig.11 The following example is shown, that is, regarding the signal transmitted on the P20 channel performing the SR operation, although AP#0 reduces the transmission power, AP#1 does not reduce the transmission power.

[0106] Fig.12 FIG. 1 is a diagram showing another example of transmission power control in which the SR operation differs by frequency band. Fig.12 As shown in another example, the AP changes the transmission power of other frequency bands in response to the transmission power change of the SR action frequency band in which the transmission power control is performed. For example, when the transmission power of the transmitted signal is reduced in a part of the frequency band, the AP can increase the transmission power of the transmitted signal in other frequency bands, or adjust the transmission power between frequency bands in such a way that the total transmission power of the transmitted signal is constant.

[0107] Although in Fig.11 In the example, AP#0 does not perform transmit power control on the signal sent in the S20 channel, but according to Fig.12 In the transmission power control example, for a signal transmitted in the S20 channel, when the transmission power of a signal transmitted in the P20 channel (other frequency band) is reduced, the transmission power of the signal transmitted in the S20 channel is increased, thereby enabling the overall transmission power of the transmitter to be used effectively.

[0108] Fig.13 FIG. 1 is a diagram showing another example of transmission power control in which the SR operation differs according to the frequency band. Fig.13 As another example shown, the frequency band is allocated and controlled to each STA in such a way that the power of the signal transmitted in the main channel is maximized. Fig.13 In this way, each AP allocates a non-SR operation in which transmission power control is not performed to the primary channel, and allocates an SR operation in which transmission power control is performed to the secondary channel.

[0109] exist Fig.13 In the example, AP#0 uses MCS#Y+ to send a signal to STA#1 in the primary 20 MHz (P20) channel, and uses MCS#X to send a signal to STA#0 in the secondary 20 MHz (S20) channel.

[0110] Although AP#1 does not transmit a signal in the primary 20 MHz (P20) channel, it transmits a signal to STA#2 using MCS#Z in the secondary 20 MHz (S20) channel.

[0111] exist Fig.13 In the example of transmit power control, AP#0 assigns the SR action for transmit power control to the S20 channel, and assigns the non-SR action without transmit power control to the P20 channel. When the transmit power is reduced by transmit power control when sending a signal in the S20 channel (other frequency band), the transmit power of the signal sent in the P20 channel will be increased.

[0112] Although in Fig.12 In the transmission power control example of FIG. 1 , the power of the signal transmitted in the sub-channel is greater than the power of the signal transmitted in the main channel, but according to Fig.13In the transmission power control example, by increasing the transmission power of the signal sent by AP#0 in the main channel, the reception performance of the preamble code sent in the main channel is improved, thereby improving the throughput.

[0113] As described above, according to Embodiment 2, the AP performs transmission power control according to the presence or absence of the SR operation for each frequency band, thereby being able to select a higher MCS, thereby improving the system throughput of the communication system.

[0114] (Implementation 3)

[0115] In Embodiment 3, as an example of performing different transmission power controls for each frequency band, the AP determines whether to perform transmission power control in accordance with the beamforming setting for each frequency band.

[0116] Fig.14 FIG. 1 is a diagram showing an example of transmission power control when beamforming operations differ for each frequency band. Fig.14 In FIG. 1 , AP#0 uses the P20 channel and the S20 channel for OFDMA multiplexing, allocates the P20 channel to STA#0, and allocates the S20 channel to STA#1. The following example is shown, that is, the P20 channel performs beamforming to suppress the interference of AP#1 to STA#2, and the S20 channel is set to a non-beamformed operation.

[0117] An example is shown in which AP#1 performs beamforming and allocates the P20 channel to STA#2 to suppress interference with STA#0 under AP#0.

[0118] The following example is shown, that is, although in the P20 channel, AP#0 and AP#1 control the signal power of the transmission signal sent to their subordinate STA#0 and STA#2 to suppress interference with each other's subordinate STA#2 and STA#0, the transmission power control of the signal sent by AP#0 in the S20 channel is independent of the transmission power control of the signal sent in the P20 channel, for example, an example in which no transmission power control is performed.

[0119] As in Embodiments 1 and 2, the AP may change the transmission power of signals transmitted in other frequency bands in accordance with the beamforming action frequency band. For example, when the transmission power of signals transmitted in a part of the frequency band is reduced by the beamforming action, the AP may increase the transmission power of signals transmitted in other frequency bands, or may adjust the transmission power between frequency bands in such a way that the total transmission power of the transmitted signals is constant. In addition, the allocation of the presence or absence of the beamforming action may be controlled in such a way that the power of the signal transmitted in the main channel is maximized.

[0120] In this way, by performing independent transmission power control for each frequency band corresponding to beamforming or non-beamforming for each frequency band, a higher MCS can be selected, thereby improving the throughput of the communication system.

[0121] (Implementation 4)

[0122] Embodiment 4 notifies the presence or absence of transmission power control for each frequency band using management frames.

[0123] Fig.15 is a diagram showing the overall sequence associated with MAP communication. Fig.15 As shown, the overall sequence is classified into the following four phases. The definitions of these phases are examples, and they can also be defined according to classifications other than these. In addition, the order of the phases can also be reversed, for example, the setting phase can be performed after the measurement phase is performed.

[0124] In the setup phase, management information is exchanged between nodes (AP, STA) using management frames such as beacon frames, probe request / response frames, association request / response frames, and action frames.

[0125] During the measurement phase, control frames such as MAP Null Data PPDU (Physical Layer Protocol Data Unit) Announcement (NDPA) frame, MAP NDP frame, MAP polling trigger and MAP Beamforming Report (BFR) are used to perform measurement indication, measurement and feedback collection of channel state information (CSI) between nodes.

[0126] In the MAP setup phase, frames for performing settings related to MAP (such as MAP setup request / response frames (SetupRequest / Response frames)) are exchanged.

[0127] MAP data transmission (data transmission) transmits MAP data. Between nodes, a MAP trigger frame that triggers MAP data transmission, or a data frame (Data frame) and an acknowledgment / block acknowledgment frame (Ack / BlockAck frame) are transmitted and received.

[0128] Figures 16 to 20 This is a diagram showing an example of frame transmission and reception in each stage.

[0129] Fig.16 This is a diagram showing an example of transmission and reception of a beacon frame and a probe request / response frame in the setup phase.

[0130] The beacon frame is a frame transmitted from the AP (AP#0, AP#1) to notify broadcast information.

[0131] The probe request / response frame is a frame for the STA to inquire whether there is a request / response from the AP.

[0132] Fig.17 This is a diagram showing an example of transmission and reception of association request / response frames in the setting phase.

[0133] The association request / response frame is a frame in which a STA requests / responds to an AP for a connection relationship.

[0134] Fig.18 This is a diagram showing an example of transmission and reception of an action frame in the setting phase.

[0135] Action frames are frames used to exchange various information between nodes.

[0136] Fig.19 This is a diagram showing an example of transmission and reception of a MAP NDPA frame, a MAP NDP frame, a MAP polling trigger, and a MAP BFR control frame in the measurement phase.

[0137] The MAP NDPA frame is a frame for performing CSI measurement instructions, designating feedback information, and the like.

[0138] The MAP NDP frame is a frame that is transmitted from a designated node following the MAP NDPA frame and measures CSI in another designated node. Fig.19 This indicates an example in which MAP NDP is sent in the order of AP#0, AP#1, STA#0, STA#1, and STA#2, and CSI is measured in each node. In the case where different MAP schemes are specified according to the P20 channel and the S20 channel as in Implementation 1, AP#0 may instruct to perform measurements using MAP NDP separately according to the P20 channel and the S20 channel. It may also be indicated that in addition to measuring CSI, each node also measures an acceptable receive interference level (ARIL: Acceptable Receiver Interference Level), transmit power, and RSSI (Received Signal Strength Indicator).

[0139] exist Fig.19 In the process, the AP requests collection by using a MAP polling trigger sent by each AP to each STA, and each STA responds to the measurement results obtained by each STA using MAPBFR, and the measurement results are collected by the AP.

[0140] Fig. 20 This is a diagram showing a transmission and reception example in a MAP setting phase for performing settings related to MAP and MAP data transmission.

[0141] The MAP Setup Request (MAP SetupReq) / MAP Setup Response (MAP SetupRes) frames in the MAP setup phase are frames for exchanging information such as AP settings required for MAP data transmission, ARIL, transmission power, RSSI, and CSI as needed.

[0142] The MAP trigger in MAP data transmission is a frame that instructs each AP to transmit data and exchanges data or response / block response frames.

[0143] The data transmission shows the following example, that is, Figure 3 Similarly, an example in which AP#0 transmits and receives signals to STA#0 in the P20 channel, AP#0 transmits and receives signals to STA#1 in the S20 channel, and AP#1 transmits and receives signals to STA#2 in the P20 channel.

[0144] Although in Figures 15 to 20 , AP#0 is shown as a sharing AP and AP#1 is a shared AP, but the present invention is not limited thereto. For example, during the setting phase, the measurement phase, or / and the MAP setting phase, the role of each AP (e.g., sharing AP / shared AP) may not be determined, or there may be no difference in the actions of the sharing AP and the shared AP (see Figure 16 to Figure 18 ).

[0145] Figure 21 to Figure 26 This is a diagram showing a structural example of indicating whether TPC is supported using elements or frames exchanged between nodes in the above sequence.

[0146] Fig.21 This is a diagram showing an example of a structure in which, when indicating whether TPC is supported, a next generation technology (NGT) operating element is used as a basis for the existing EHT operating element.

[0147] Next-generation technology (NGT) refers to the next generation relative to the existing EHT, and may also be known by other names.

[0148] The NGT operation element includes an element ID (Element ID) of 255, an element ID extension (Element ID Extension) of 114, NGT operation parameters (Operation Parameters) and NGT operation information (Operation Information). The description related to the fields specified in the EHT operation element is omitted. Element ID = 255 indicates a structure with an element ID extension, and the element ID extension is set to a value representing a next generation technology (NGT) operation element (for example, a value not defined in previous standards, 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. In order to define the NGT operation element, values ​​other than 114 may also be used for the element ID extension. The NGT operation parameters include NGT operation information present (NGT Operation Information Present) and TPC supported subchannel information present (TPC Supported Subchannel Information Present).

[0149] The existence of NGT operation information indicates whether there is an NGT operation information field. The existence of subchannel information supporting TPC indicates whether there is a subchannel bitmap field supporting TPC. In the case where the existence of NGT operation information is used to indicate the existence of an NGT operation information field, and the existence of subchannel information supporting TPC is used to indicate the existence of a subchannel bitmap field supporting TPC, the NGT operation information includes a subchannel bitmap supporting TPC.

[0150] The subchannel bitmap supporting TPC indicates whether each subchannel supports TPC in the frequency band unit. For example, a bitmap of "1" indicates that the corresponding subchannel supports TPC. Alternatively, a bitmap of "0" may indicate that the corresponding subchannel supports TPC. Instead of directly indicating whether TPC is supported, other methods may be used to indicate whether TPC is supported, such as indicating whether TPC is supported by indicating a MAP scheme.

[0151] Fig. 22 This is a diagram showing an example of a structure in which an element is newly defined as a subchannel element supporting TPC in a structure similar to an EHT operation element when indicating whether TPC is supported.

[0152] The TPC-supported subchannel element includes an element ID of 255, an element ID extension of 114, TPC-supported subchannel parameters (TPC Supported Subchannel Parameters), and TPC-supported subchannel information. The descriptions related to the fields specified in the EHT operation element are omitted. Element ID = 255 indicates a structure with an element ID extension, and the element ID extension is set to a value not defined in previous standards, such as 114. Element ID extension = 114 indicates that it is a TPC-supported subchannel element. Element ID extension = 114 is defined as a TPC-supported subchannel element. In order to define a TPC-supported subchannel element, values ​​other than 114 may also be used for the element ID extension. The TPC-supported subchannel parameters include the existence of TPC-supported subchannel information and the existence of a TPC-supported subchannel bitmap.

[0153] The existence of subchannel information supporting TPC indicates whether there is a subchannel information field supporting TPC. The existence of a subchannel bitmap supporting TPC indicates whether there is a subchannel bitmap supporting TPC. In the case where the existence of subchannel information supporting TPC indicates the existence of a subchannel information field supporting TPC, and the existence of a subchannel bitmap supporting TPC indicates the existence of a subchannel bitmap supporting TPC, the subchannel information supporting TPC includes a channel width (Channel Width) and a subchannel bitmap supporting TPC.

[0154] The subchannel bitmap supporting TPC indicates whether each subchannel supports TPC in the unit of channel width. A bitmap of "1" indicates that the corresponding subchannel supports TPC. A bitmap of "0" may also indicate that the corresponding subchannel supports TPC. Instead of directly indicating whether TPC is supported, other methods may be used to indicate whether TPC is supported, for example, by indicating a MAP scheme.

[0155] Fig.23 This is a diagram showing another example of a structure in which, when indicating whether TPC is supported, an element is newly defined as a sub-channel element supporting TPC with a structure similar to that of a supported channel element.

[0156] The sub-channel element supporting TPC includes an element ID of 245, a first channel number (First Channel Number), a number of channels (Number of Channels), and a sub-channel bitmap supporting TPC. Setting the element ID to a value not defined in previous standards, such as 245, indicates that it is a sub-channel element supporting TPC. Element ID = 245 indicates that it is a sub-channel element supporting TPC. Element ID = 245 is defined as a sub-channel element supporting TPC. In order to define a sub-channel element supporting TPC, a value other than 245 may be used for the element ID.

[0157] The first channel number indicates the initial channel number within the supported subband. The number of channels indicates the number of channels.

[0158] The subchannel bitmap supporting TPC includes a number of bits for each channel, and indicates whether each channel supports TPC. A bitmap of "1" indicates that the corresponding subchannel supports TPC. A bitmap of "0" may also indicate that the corresponding subchannel supports TPC. Instead of directly indicating whether TPC is supported, other methods may be used to indicate whether TPC is supported, such as indicating whether TPC is supported by indicating a MAP scheme.

[0159] Figure 21 to Figure 23 The elements shown in may be included in management frames such as beacons, association requests, and probe request frames as necessary for notification. In addition, TPC support may be indicated at a stage other than the setting stage.

[0160] Figure 24 to Figure 26 This is a diagram showing an example of a structure in which TPC support is defined using an action frame.

[0161] Fig.24 This is a diagram showing an example of a structure in which a new type of action frame is defined as a TPC-supporting action frame.

[0162] The TPC supported action frame includes a category set to code (Code) = 38, a TPC supported action, and a TPC support setup element (Support Setup Elements). The category code in the action frame is set to a value not defined in the previous standard, such as 38, indicating that it is a TPC supported action frame. The category code = 38 indicates that it is a TPC supported action frame. The category code = 38 is defined as a TPC supported action frame. A value other than 38 may be used for the code to define a TPC supported action frame.

[0163] In the TPC support action, according to the MAP action field value (Action field value), for example, a TPC support setup request (Support Setup Request) for making a setup request for TPC support and a TPC support setup report (Support Setup Report) which is a response to the setup request are defined. The MAP action field value = 0 may be defined as a TPC support setup request, and the MAP action field value = 1 may be defined as a TPC support setup report. Other values ​​may be used for the MAP action field value in order to define the TPC support setup request and the TPC support setup report.

[0164] In the case of a TPC support setting request, the TPC support setting element includes a channel width and a TPC-supported sub-channel bitmap. Alternatively, the TPC support setting element may be composed of a channel width and a TPC-supported sub-channel bitmap.

[0165] The subchannel bitmap supporting TPC indicates whether each subchannel supports TPC in the unit of channel width. A bitmap of "1" indicates that the corresponding subchannel supports TPC. Alternatively, a bitmap of "0" may indicate that the corresponding subchannel supports TPC. Alternatively, instead of directly indicating whether TPC is supported, other methods may be used to indicate whether TPC is supported, such as a MAP scheme.

[0166] In the case of a TPC support configuration report, the TPC support configuration element includes a status code (Status Code).

[0167] The status code indicates whether the setting request was successful.

[0168] Fig.25 This is a diagram showing an example of a structure in which a TPC support action frame is defined in one common action frame.

[0169] The public action frame includes a category set to code = 4, a public action set to a public action field value (PublicAction field value) = 47 or 48, and a TPC support setting element. Public (=4) is set as the category code, and the public action field value is set to a value not defined in previous standards, such as 47, which indicates a TPC support setting request, and 48, which indicates a TPC support setting report. Public action = 47 indicates a TPC support setting request, and public action = 48 indicates a TPC support setting report. Public action = 47 is defined as a TPC support setting request, and public action = 48 is defined as a TPC support setting report. Other values ​​can also be defined for the public action field value.

[0170] In the case of a TPC support setting request, the TPC support setting element includes a channel width and a TPC-supported sub-channel bitmap. Alternatively, the TPC support setting element may be composed of a channel width and a TPC-supported sub-channel bitmap.

[0171] The subchannel bitmap supporting TPC indicates whether each subchannel supports TPC in the unit of channel width. A bitmap of "1" indicates that the corresponding subchannel supports TPC. Alternatively, a bitmap of "0" may indicate that the corresponding subchannel supports TPC. Alternatively, instead of directly indicating whether TPC is supported, other methods may be used to indicate whether TPC is supported, such as a MAP scheme.

[0172] In the case of a TPC support settings report, the TPC support settings element includes a status code.

[0173] The status code indicates whether the setting request was successful.

[0174] Fig.26 This is a diagram showing an example of a structure in which a new type of action frame is defined as an NGT action frame, and a value of an NGT action field is defined as a subchannel notification frame supporting TPC.

[0175] The NGT action frame includes a category set to code = 38, an NGT action set to NGT action field value = 1, and a subchannel notification that supports TPC. The category code is set to a value not defined in the previous standard, such as 38, indicating that it is an NGT action frame. The category code = 38 indicates that it is an NGT action frame. The category code = 38 is defined as an NGT action frame. Other values ​​can also be defined for the category code.

[0176] In the case where the category is NGT (code=38), for example, the NGT action field value=1 of the NGT action indicates that it is a TPC-supported subchannel notification notifying TPC support. The NGT action field value=1 is defined as a TPC-supported subchannel notification. The TPC-supported subchannel notification includes a channel width and a TPC-supported subchannel bitmap. Alternatively, the TPC-supported subchannel notification may be composed of a channel width and a TPC-supported subchannel bitmap.

[0177] The subchannel bitmap supporting TPC indicates whether each subchannel supports TPC in the unit of channel width. A bitmap of "1" indicates that the corresponding subchannel supports TPC. Alternatively, a bitmap of "0" may indicate that the corresponding subchannel supports TPC. Alternatively, instead of directly indicating whether TPC is supported, other methods may be used to indicate whether TPC is supported, such as a MAP scheme.

[0178] Although in Figure 24 to Figure 26, an example of defining a TPC support setting element or a TPC-supported subchannel notification in an NGT action is shown, but it can also be defined in an operating mode notification frame or an NGT MIMO control field. It can also be defined in other management frames. In addition, it can also be a name other than a TPC support setting element or a TPC-supported subchannel notification.

[0179] According to the fourth embodiment, the presence or absence of transmission power control for each frequency band is notified using a management frame, thereby enabling independent transmission power control for each frequency band, thereby enabling selection of a higher MCS and improving system throughput.

[0180] (Implementation method 5)

[0181] Embodiment 5 defines the capability (Capability) of supporting reception of transmission power differences between frequency bands.

[0182] When performing the transmission power control of Embodiments 1 to 3, the definition of capability of Embodiment 5 can be used. Also, when using the notification of Embodiment 4, the definition of capability of Embodiment 5 can be used.

[0183] Fig. 27 is a diagram showing an example of the definition of subfields of the NGT PHY capability information field. Fig. 27 As shown, a range exceeding the existing range [0.5, 2] (equivalent to ±6dB), for example, [0.1, 10] (equivalent to ±20dB), is defined as an extension of Power Boost Factor Support (IEEE P802.11be / D2.0, Table 9-401k). This range is an example, and other values ​​may be defined within the range that can be supported for reception. Although OFDMA transmission is assumed and the transmit power difference is limited to ±6dB, it is not sufficient for the ability to handle the transmit power difference between frequency bands when the transmission scheme, such as the MAP scheme, differs by frequency band. However, according to Embodiment 5, a range exceeding ±6dB, for example, ±20dB, can be defined, so that the node can perform independent transmit power control by frequency band.

[0184] Fig.28 FIG. 1 is a diagram showing an example of defining a range of transmission power difference that is changed according to the RU size. Fig.28In the example shown, for example, when the effect of the transmission power difference is small, such as when the RU size is small (e.g., below 20 MHz), the range of the transmission power difference is set to be small (e.g., ±6 dB), and when the effect of the transmission power difference is large, such as when the RU size is large (e.g., above 40 MHz), the range of the transmission power difference is set to be large (e.g., ±20 dB). In addition, Fig.28 The 242-tone is the number of subcarriers in 20MHz.

[0185] Fig.29 is a diagram showing an example of the ability to define the range of the transmission power difference corresponding to the SR setting for each frequency band. Fig.29 In the example shown, when SR is not set, the change range of the transmission power difference is set small (for example, ±6 dB), and when SR is set, the change range of the transmission power difference is set large (for example, ±20 dB).

[0186] In addition, the device class of the node may define whether or not the transmission or reception of the transmission power difference between frequency bands is supported, differently from the capability.

[0187] Capability or 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.

[0188] According to the fifth embodiment, the transmission power difference between frequency bands can be set according to the capability of the STA, so a high MCS can be selected, thereby improving the system throughput.

[0189] The transmission power control in Embodiments 1 to 5 can be applied to any of the downlink and the uplink.

[0190] Although in Figure 1 Although an example in the case of a downlink is shown in FIG, the present disclosure can also be applied to an uplink in the same manner as the downlink. Fig.30 This is a diagram for explaining the situation of uplink.

[0191] Fig.30 This example assumes that STA#0 sends an uplink to AP#0 in the P20 channel and the S20 channel, and STA#1 sends an uplink to AP#1 in the P20 channel. Here, the P20 channel is C-SR and the S20 channel is C-OFDMA.

[0192] The transmission power control in the uplink can be performed by the STA in accordance with the frequency band, similar to the transmission power control in the downlink. Moreover, when the transmission power of the signal transmitted in a part of the frequency band is reduced, the STA can increase the transmission power in other frequency bands. In addition, the AP can also control the allocation of frequency bands and MAP schemes in such a way that the power of the main channel is maximized. The allocation of frequency bands and MAP schemes is performed by the AP, so even in the case of the uplink where the transmission power control is performed by the STA, the allocation of frequency bands and MAP schemes is still performed by the AP.

[0193] Fig.31 This is a diagram showing an example of transmission power control in the uplink when the MAP scheme differs for each frequency band.

[0194] When the transmission power of the signal transmitted by STA#0 and STA#1 in the P20 channel is reduced, the transmission power of the signal transmitted by STA#0 in the S20 channel can be increased. As a result, the reception power (interference) of the signal received by AP#0 from STA#1 in the P20 channel and the reception power (interference) of the signal received by AP#1 from STA#0 in the P20 channel are reduced, while the reception power of the signal received by AP#0 from STA#0 in the S20 channel is increased. Therefore, a high MCS can be selected for the signal transmitted by STA# in the S20 channel, so the throughput of the communication system is improved.

[0195] Embodiments 1 to 5 may be combined as appropriate. For example, both the MAP scheme (embodiment 1) and the presence or absence of SR (embodiment 2) may be used to perform transmission power control. For example, when the MAP scheme of Example 1 is used to perform transmission power control, the notification of embodiment 4 may be used. For example, both the MAP scheme (embodiment 1) and the support or absence of reception (embodiment 5) may be used to perform transmission power control. For example, the transmission power control may be performed using the MAP scheme (embodiment 1), the presence or absence of SR (embodiment 2), and the support or absence of reception (embodiment 5).

[0196] The wireless communication system of this embodiment may include, for example, a plurality of APs 100 and a plurality of STAs 200. The AP 100 may have the functions of both a shared AP and a shared AP, or may have the function of either one of them.

[0197] Fig.32 1 is a block diagram showing a configuration example of a part of the AP 100 according to one embodiment of the present disclosure. Fig.33 1 is a block diagram showing a configuration example of a part of the STA 200 according to one embodiment of the present disclosure.

[0198] Fig.32 The AP 100 shown is an example of a communication device. Fig.32 In the AP 100 shown, the wireless transceiver unit 105 (e.g., equivalent 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). The control unit 101 (e.g., equivalent to a control circuit) controls the coordinated communication (e.g., control of the transmission power) based on the MAP scheme of the frame.

[0199] Fig.33 The STA 200 shown is an example of a communication device. Fig.33 In the STA 200 shown, the control unit 204 (for example, corresponding to a control circuit) receives frames from a plurality of other communication devices (for example, the AP 100 ) and performs control of cooperative communication (for example, control of transmission power).

[0200] Fig.34 This is a block diagram showing a configuration example of AP 100 according to the first embodiment. Fig.34 The AP 100 shown may include, for example, a control unit 101 , a control signal generating unit 102 for STAs, a control signal generating unit 103 for APs, a transmission signal generating unit 104 , a wireless transceiver unit 105 , and a reception signal demodulation / decoding unit 106 .

[0201] The control unit 101 may control the setting of transmission frames (or signals) including MAP trigger frames, etc. For example, when the AP 100 is a shared AP, the control unit 101 may control the generation of control signals (eg, MAP trigger frames) for other APs 100 (eg, shared APs).

[0202] It should be noted that the transmission frame may be a transmission frame having any one of the above-mentioned frame structures.

[0203] In addition, the control unit 101 can, for example, set control information for STA200 or other AP100. For example, the control unit 101 can set resource allocation information and scheduling information such as MCS for each STA200. In addition, the control unit 101 can, for example, determine parameters related to transmission control (for example, control of coordinated communication) (for example, parameters related to coordinated communication) based on information input from the received signal demodulation / decoding unit 106 (for example, control information notified from the shared AP to the shared AP). The control unit 101 can, for example, output control information containing the determined transmission control parameters to the control signal generation unit 102 for STA and the control signal generation unit 103 for AP.

[0204] In addition, the control unit 101 may control, for example, coordinated communication for STA200. For example, the control unit 101 controls the transmission of setting information related to the setting of coordinated communication for STA200. The setting information may include information used for event reports (an example of feedback information) from STA200. In addition, for example, the control unit 101 controls the transmission of information (for example, notification information) requesting event reports from STA200 for STA200. In addition, for example, the control unit 101 controls the transmission of measurement signals for measuring communication quality for STA200. In addition, for example, the control unit 101 controls the switching of the MAP scheme based on the event reports received from STA200.

[0205] The control signal generating unit 102 for STA can, for example, generate a control signal (e.g., a trigger frame) for STA 200, and output the generated control signal to the transmission signal generating unit 104. In addition, the control signal generating unit 102 for STA can generate various signals for STA 200 according to the control of the control unit 101, and output the generated signals to the transmission signal generating unit 104.

[0206] The control signal generator 103 for AP can generate a control signal (e.g., a MAP trigger frame) for AP 100. For example, the control signal generator 103 for AP can generate a control signal based on control information input from the control unit 101 and information input from the received signal demodulation / decoding unit 106.

[0207] The transmission signal generating unit 104 can perform transmission processing on the control signal, data, and ACK (ACKnowledge, response) / NACK (NegativeACKnowledge, negative response) input from the control signal generating unit 102 for STA or the control signal generating unit 103 for AP, and generate a wireless frame (transmission signal). The transmission signal generating unit 104 outputs the generated transmission signal to the wireless transceiver unit 105.

[0208] The wireless transceiver 105 performs wireless transmission processing such as D / A (Digital / Analog) conversion and up-conversion of the transmission signal input from the transmission signal generator 104, and transmits the signal after the wireless transmission processing via the antenna.

[0209] For example, when receiving an uplink signal transmitted from the STA 200 or a control signal transmitted from another AP 100 , the AP 100 may operate as follows.

[0210] The wireless signal received via the antenna is input to the wireless transceiver 105. The wireless transceiver 105 performs wireless reception processing such as down-conversion of the received wireless signal to a carrier frequency, and outputs the signal after the wireless reception processing to the received signal demodulation / decoding unit 106.

[0211] The received signal demodulation / decoding unit 106 can, for example, perform processing such as autocorrelation processing on the signal input from the wireless transceiver unit 105, and extract the received wireless frame. In addition, the received signal demodulation / decoding unit 106 can, for example, decode and demodulate the uplink signal (for example, response signal, feedback information) from the STA 200 or the control signal (for example, MAP trigger frame) from other APs 100 contained in the extracted wireless frame. The received signal demodulation / decoding unit 106 can, for example, output the demodulated control signal to the control unit 101, the control signal generation unit 102 for STAs, and the control signal generation unit 103 for APs.

[0212] Fig.35 This is a block diagram showing a configuration example of the STA 200 according to the first embodiment. Fig.35 The STA 200 shown may include, for example, a wireless transceiver unit 201 , a received signal demodulation / decoding unit 202 , a transmission signal generation unit 203 , and a control unit 204 .

[0213] The wireless transceiver unit 201 receives 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 / decoding unit 202. In addition, the wireless transceiver unit 201 may perform wireless transmission processing such as D / A conversion and up-conversion to a carrier frequency on the signal input from the transmission signal generation unit 203, and transmit the signal after the wireless transmission processing via an antenna.

[0214] The received signal demodulation / decoding unit 202 may, for example, perform processing such as autocorrelation processing on the signal input from the wireless transceiver unit 201, and extract the received wireless frame. The received signal demodulation / decoding unit 202 may, for example, demodulate and decode the control signal (for example, trigger frame) contained in the extracted wireless frame, and obtain the uplink transmission control parameter. The received signal demodulation / decoding unit 202 may, for example, output the obtained uplink transmission control parameter to the transmission signal generation unit 203.

[0215] The reception signal demodulation / decoding unit 202 outputs the received signal (eg, NDP) to the control unit 204 .

[0216] The transmission signal generating unit 203 may perform transmission signal processing on an uplink signal (e.g., a signal including feedback information) and generate a radio frame (transmission signal) based on the uplink transmission control parameter input from the received signal demodulation / decoding unit 202. The transmission signal generating unit 203 may output the generated transmission signal to the wireless transceiver unit 201, for example.

[0217] The control unit 204 controls coordinated communication (e.g., MAP scheme). For example, the control unit 204 measures measurement values ​​such as CSI and / or RSSI based on the received signal (e.g., NDP). The control unit 204 generates feedback information related to switching of the MAP scheme based on the measurement values.

[0218] (Other embodiments)

[0219] Furthermore, although an example of the structure of each frame is described in each of the above embodiments, the information to be notified is not limited to the information shown in the above embodiments, and for example, other information may be added, or at least a part of the defined information may be deleted.

[0220] In addition, the structures of frames, elements, fields, and subfields in the above embodiments are examples, and the present disclosure is not limited to the above examples. For example, at least one element in the above frame structure may be omitted, or an element not included in the structure may be included in the above frame structure.

[0221] In addition, although the terms “shared AP” and “shared AP” are used to describe the AP that instructs coordinated communication and the AP that is instructed to coordinate communication in the above-mentioned embodiments, the present invention is not limited thereto, and other terms may be used.

[0222] In addition, although the above-mentioned embodiments are described based on the format of IEEE802.11be as a non-limiting example, the format applicable to an embodiment of the present disclosure is not limited to the format of IEEE802.11be. An embodiment of the present disclosure can also be applied to IEEE802.11bd (NGV (Next Generation V2X, next generation vehicle wireless communication technology)), which is the next generation standard of IEEE 802.11p as an in-vehicle standard.

[0223] The present disclosure can be implemented by software, hardware or software in cooperation with hardware. Each functional block used in the description of the above-mentioned embodiments is partially or entirely implemented as an LSI (Large Scale Integration) as an integrated circuit, and each process described in the above-mentioned embodiments may also be partially or entirely controlled by an LSI or a combination of LSIs. LSI can be composed of individual chips, or it can be composed of one chip in a manner that includes part or all of the functional blocks. LSI may also include input and output of data. LSI is sometimes referred to as "IC (Integrated Circuit)", "System LSI", "Super LSI", "Ultra LSI" depending on the degree of integration.

[0224] The method of integrated circuitization is not limited to LSI, and can also be implemented by a dedicated circuit, a general-purpose processor or a dedicated processor. In addition, an FPGA (Field Programmable Gate Array) that can be programmed after LSI manufacturing, or a reconfigurable processor (Reconfigurable Processor) that can reconfigure the connection or setting of the circuit block inside the LSI can also be used. The present disclosure can also be implemented as digital processing or analog processing.

[0225] Furthermore, if integrated circuit technology that replaces LSI emerges as semiconductor technology advances or other technologies are derived, it is of course possible to use this technology to achieve integration of functional blocks. There is also the possibility of applying biotechnology, etc.

[0226] The present disclosure can be implemented in all kinds of devices, equipment, and systems (collectively referred to as "communication devices") with communication functions. The communication device may also include a wireless transceiver and a processing / control circuit. The wireless transceiver may also include a receiving unit and a transmitting unit, or perform the functions of these parts. 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 a device similar to these. Non-limiting examples of communication devices include: phones (mobile phones, smart phones, etc.), tablets, personal computers (PCs) (laptops, desktops, notebook computers, etc.), cameras (digital cameras, digital video cameras, etc.), digital players (digital audio / video players, etc.), wearable devices (wearable cameras, smart watches, tracking devices, etc.), game consoles, e-book readers, telehealth / telemedicine (telehealth / medical prescription) equipment, vehicles or transportation vehicles with communication functions (cars, airplanes, ships, etc.), and combinations of the above-mentioned various devices.

[0227] Communication devices are not limited to portable or mobile devices, but also include all kinds of devices, equipment, and systems that cannot be carried or fixed. For example, they 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.

[0228] The communication includes data communication performed by a cellular system, a wireless LAN system, a communication satellite system, etc., and also includes data communication performed by a combination of these systems.

[0229] In addition, the communication device also includes devices such as controllers or sensors connected or linked to the communication device that performs the communication function described in the present invention. For example, it includes a controller or sensor that generates a control signal or data signal used by the communication device that performs the communication function of the communication device.

[0230] In addition, the communication device includes infrastructure equipment that communicates with the above-mentioned non-limiting various devices or controls the above-mentioned various devices, such as base stations, access points, and all other devices, equipment, and systems.

[0231] 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 frequency bands; and a transceiver circuit that transmits a signal using the plurality of frequency bands.

[0232] In one embodiment of the present disclosure, the control circuit performs transmission power control corresponding to a MAP (Multiple Access Point) scheme for each frequency band.

[0233] In one embodiment of the present disclosure, transmission power control is performed according to the presence or absence of SR (Spatial Reuse) operation for each frequency band.

[0234] In one embodiment of the present disclosure, transmission power control is performed according to the setting of beamforming for each frequency band.

[0235] In one embodiment of the present disclosure, a management frame is used to notify whether or not transmission power control is performed for each frequency band.

[0236] In one embodiment of the present disclosure, the management frame is a beacon, an association request / response, a probe request / response, or an action frame.

[0237] In one embodiment of the present disclosure, the control circuit performs transmit power control according to whether reception of transmit power difference between terminals is supported or not.

[0238] In one embodiment of the present disclosure, whether the reception is supported or not is defined according to the capabilities contained in a beacon, an association request / response, a probe request / response or an action frame.

[0239] A communication method according to an embodiment of the present disclosure performs the following processing: performing independent transmission power control for each of a plurality of frequency bands; and transmitting a signal using the plurality of frequency bands.

[0240] The disclosed contents of the specification, drawings, and abstract contained in the Japanese patent application No. 2022-115606 filed on July 20, 2022 are incorporated herein by reference in their entirety.

[0241] Industrial Applicability

[0242] One embodiment of the present disclosure is useful for a wireless communication system.

[0243] Description of Reference Numerals

[0244] 100 AP

[0245] 101, 204 Control Department

[0246] 102 Control signal generating unit for STA

[0247] 103 Control signal generating unit for AP

[0248] 104, 203 Transmitting signal generating unit

[0249] 105, 201 Wireless transceiver unit

[0250] 106, 202 Received signal demodulation / decoding unit

[0251] 200 STA

Claims

1. A communication device, characterized in that: include: A control circuit performs transmission power control corresponding to the transmission scheme for each frequency band constituting the plurality of frequency bands; as well as The transceiver circuit uses the multiple frequency bands to send signals.

2. The communication device according to claim 1, wherein: The sending scheme is a multiple access point scheme, namely, a MAP scheme.

3. The communication device according to claim 1, wherein: The transmission scheme refers to the presence or absence of a spatial reuse action, namely, an SR action.

4. The communication device according to claim 1, wherein: The transmission scheme is a beamforming setting.

5. The communication device according to claim 1, wherein: The transceiver circuit notifies the presence or absence of transmission power control for each frequency band using a management frame.

6. The communication device according to claim 5, wherein: The management frame is a beacon, association request / response, probe request / response, or action frame.

7. The communication device according to claim 1, wherein: The control circuit performs transmission power control according to whether the receiving station supports reception of the transmission power difference.

8. The communication device according to claim 7, wherein: Whether the reception is supported or not is defined according to the capabilities contained in the beacon, association request / response, probe request / response or action frame.

9. A communication method, characterized in that: Perform the following processing: Performing transmission power control corresponding to the transmission scheme for each frequency band constituting the plurality of frequency bands; and Signals are transmitted using the plurality of frequency bands.

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