Communication device, communication method, and program

Abstract

To provide a communication device, a communication method, and a program that allow preamble puncturing to be used in wireless LAN communication even in a frequency bandwidth larger than 160 MHz.SOLUTION: A communication device capable of wireless communication based on the IEEE802.11 standard has transmitting means for transmitting a wireless frame having a preamble and a data field of a physical layer (PHY). The preamble includes an L-STF, an L-LTF, an L-SIG, an EHT-SIG-A, an EHT-STF, and an EHT-LTF, and the EHT-SIG-A includes information on preamble puncturing when a frequency bandwidth used by the communication device is 320 MHz.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a communication device, a communication method, and a program for performing wireless communication. Background Art

[0002] In recent years, wireless LAN (Wireless Local Area Network, hereinafter referred to as WLAN) technology has achieved improved throughput for data communication, and various technical developments are currently being actively carried out.

[0003] As one of WLAN communication standards, the IEEE 802.11 series of standards is known, and includes standards such as IEEE 802.11a / b / g / n / ac / ax. The latest standard, IEEE 802.11ax, uses OFDMA (Orthogonal Frequency-Division Multiple Access) technology. This achieves a high peak throughput of up to 9.6 gigabits per second (Gbps) and improves communication speed under congested conditions (see Patent Document 1). Furthermore, the IEEE 802.11be standard is being studied as a successor standard aiming at further improving throughput.

[0004] As one of the measures to improve throughput targeted by IEEE 802.11be, expanding the maximum radio frequency bandwidth from the conventional 160 MHz to 320 MHz is under consideration.

[0005] Furthermore, in order to efficiently use the frequency band, the use of a technology called Preamble Puncturing is under consideration. This is a technology for performing communication using the remaining frequency bandwidth other than the unavailable frequency bandwidth when a part of the used frequency bandwidth is unavailable. Prior Art Literature Patent Literature

[0006] Patent Document 1 U.S. Patent Application Publication No. 2018 / 50133 [Overview of the project] [Problems that the invention aims to solve]

[0007] As mentioned above, IEEE 802.11be is considering extending the usable frequency bandwidth to 320 MHz. However, the previous wireless LAN standard, IEEE 802.11ax, could only use Preamble Puncturing up to a bandwidth of 160 MHz. Therefore, the present invention aims to enable the use of Preamble Puncturing in wireless LAN communication even at frequency bandwidths larger than 160 MHz. [Means for solving the problem]

[0008] In view of the above issues, a communication device according to one aspect of the present invention is a communication device capable of wireless communication based on the IEEE 802.11 standard, and having a physical layer (PHY) preamble and a data field MU PPDU(Multi User Physical layer Protocol Data Unit) It has a transmission means for wirelessly transmitting, and the preamble is L-STF (Legacy Short Training Field), Located immediately after the aforementioned L-STF L-LTF (Legacy Long Training Field) and Located immediately after the aforementioned L-LTF L-SIG (Legacy Signal Field) An RL-SIG positioned immediately after the L-SIG, and a second Signal Field positioned immediately after the RL-SIG, Includes a first field group and a second field group Second Signal Field and, A third signal field is positioned immediately after the second signal field, an STF (Short Training Field) is positioned after the third signal field, and an LTF (Long Training Field) is positioned after the STF. The first group of fields includes a field indicating bandwidth and a field indicating information about BSS Color, The field indicating the bandwidth is a field configured to store a predetermined value indicating that the bandwidth is 320 MHz. The second group of fields includes a field consisting of a predetermined number of consecutive bits indicating information about preamble puncturing, wherein at least one bit of the predetermined number of consecutive bits indicates whether or not to puncture a bandwidth of 20 MHz. [Effects of the Invention]

[0009] According to the present invention, Preamble Puncturing can be used in wireless LAN communication even in frequency bandwidths larger than 160 MHz. [Brief explanation of the drawing]

[0010] [Figure 1] A diagram showing an example of the network configuration in this embodiment. [Figure 2] This figure shows an example of the hardware configuration of the communication device in this embodiment. [Figure 3] This figure shows an example of the frequency band configuration used for wireless communication in this embodiment. [Figure 4] This figure shows an example of the PHY frame structure of the EHT SU PPDU in this embodiment. [Figure 5] This figure shows an example of the PHY frame structure of the EHT MU PPDU in this embodiment. [Figure 6] This figure shows an example of the PHY frame structure of the EHT ER PPDU in this embodiment. [Modes for carrying out the invention]

[0011] Embodiments of the present invention will be described in detail below with reference to the attached drawings.

[0012] Figure 1 shows an example of the network configuration according to this embodiment. The wireless network 101 in Figure 1 consists of an access point (hereinafter referred to as AP) 102 and multiple stations (hereinafter referred to as STA) 103, 104, and 105. Here, AP 102 is, for example, an access point compliant with the IEEE 802.11 standard, and also includes a Group Owner (hereinafter referred to as GO) compliant with the Wi-Fi Direct standard. If AP 102 is a GO, the multiple STAs 103 to 105 are also called Clients.

[0013] The AP 102 constructs a wireless network 101 conforming to the IEEE 802.11 standard, and transmits a beacon including identification information of the wireless network. Here, the dotted line indicated as the wireless network 101 in FIG. 1 indicates the range reached by a signal transmitted by the AP 102, and the AP 102 can communicate with STAs located within the range of the dotted line. Furthermore, the AP 102 may have a relay function.

[0014] When the AP 102 receives a Probe Request message transmitted from a STA, the AP 102 transmits a Probe Response message as a response. The Probe Response message includes identification information of the wireless network 101. The identification information of the wireless network is, for example, a Service Set Identifier (hereinafter referred to as SSID).

[0015] Furthermore, the AP 102 communicates with each of the STAs 103 to 105 in accordance with a wireless communication method based on the IEEE 802.11be standard. The AP 102 establishes a wireless connection with each of the STAs 103 to 105 via a predetermined association process or the like.

[0016] Note that FIG. 1 is an example, and the following discussion can be applied to, for example, a network including a large number of communication devices over a wider area, and to various positional relationships of communication devices.

[0017] FIG. 2 shows the hardware configuration of the AP 102 serving as a communication device and the STAs 103 to 105 according to the present embodiment. The AP 102 according to the present embodiment may be not only a dedicated AP device such as a so-called wireless LAN router, but also a device such as a smartphone, a camera, a printer, or a projector. Furthermore, the STAs 103 to 105 may also be devices such as smartphones, cameras, printers, or projectors. Furthermore, one communication device may have both the function of an AP and the function of a STA.

[0018] The AP and the STA include, as an example of the hardware configuration thereof, a storage unit 201, a control unit 202, a functional unit 203, an input unit 204, an output unit 205, a communication unit 206, and an antenna 207.

[0019] The storage unit 201 includes one or more of or both ROM and RAM, and stores various types of information such as programs for executing various operations described below and communication parameters for wireless communication. Note that, as the storage unit 201, in addition to memories such as ROM and RAM, a storage medium such as a flexible disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a CD-R, a magnetic tape, a non-volatile memory card, or a DVD may be used.

[0020] The control unit 202 is configured by, for example, one or more processors such as CPUs and MPUs, an ASIC (Application Specific Integrated Circuit), a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array), or the like. Here, CPU is an acronym for Central Processing Unit, and MPU is an acronym for Micro Processing Unit. The control unit 202 controls the entire apparatus by executing a program stored in the storage unit 201. Note that the control unit 202 may control the entire apparatus through cooperation between the program stored in the storage unit 201 and an OS (Operating System).

[0021] Further, the control unit 202 controls the functional unit 203 to execute predetermined processing such as imaging, printing, and projection. The functional unit 203 is hardware for the AP or the STA to execute predetermined processing. For example, when the AP or the STA is a camera, the functional unit 203 is an imaging unit and performs imaging processing. Further, for example, when the AP or the STA is a printer, the functional unit 203 is a printing unit and performs printing processing. Further, for example, when the AP or the STA is a projector, the functional unit 203 is a projection unit and performs projection processing. Data processed by the functional unit 203 may be data stored in the storage unit 201, or may be data communicated with another AP or STA via the communication unit 206 described below.

[0022] The input unit 204 receives various operations from the user. The output unit 205 provides various outputs to the user. Here, the output from the output unit 205 includes at least one of the following: display on the screen, audio output from a speaker, vibration output, etc. Note that both the input unit 204 and the output unit 205 may be implemented in a single module, such as a touch panel.

[0023] The communication unit 206 is a so-called wireless LAN chip that controls wireless communication compliant with the IEEE 802.11 standard series, as well as IP (Internet Protocol) communication. In this embodiment, the communication unit 206 can perform processing for communication compliant with at least the IEEE 802.11be standard. The communication unit 206 is a processing unit that generates PPDUs (Physical layer (PHY) Protocol Data Units) compliant with the IEEE 802.11 standard series, or a processing unit that receives and processes PPDUs generated by other devices. In this embodiment, the communication unit 206 generates or processes various PPDUs, which will be described later. The communication unit 206 also controls the antenna 207 to transmit and receive wireless signals for wireless communication. The AP or STA communicates content such as image data, document data, and video data with other communication devices via the communication unit 206. The wireless antenna 207 is an antenna capable of receiving either the sub-GHz band, 2.4GHz band, 5GHz band, or 6GHz band. The wireless antenna 207 may be physically composed of two or more antennas in order to perform MIMO communication.

[0024] Figure 3 shows the frequency band configuration used in wireless communication in this embodiment. In the 2.4GHz band used for wireless LAN, the usable frequency bandwidth is 20MHz or 40MHz. Similarly, in the 5GHz band also used for wireless LAN, the usable frequency bandwidth is one of 20MHz, 40MHz, 80MHz, or 160MHz.

[0025] In this embodiment, a frequency band from 5.925 GHz to 7.125 GHz, known as the 6 GHz band, is also made available. In the 6 GHz band, in addition to 20 MHz, 40 MHz, 80 MHz, and 160 MHz, a bandwidth of 320 MHz is also available. Note that Figure 3 is just an example, and other frequency bands may be made available, and a bandwidth of 320 MHz may also be made available in the 5 GHz band.

[0026] Figures 4-6 show examples of frame formats for EHT SU PPDU, EHT MU PPDU, and EHT ER PPDU, which are wireless frames in the IEEE 802.11be standard used in this embodiment. EHT stands for Extremely High Throughput. These PPDUs include a physical layer (PHY) preamble, data fields, and a Packet Extension. The PPDU preamble includes the fields shown in 401-407 (or 501-508, 601-607). Data fields 408, 509, and 608 store various data from the MAC layer and above. Note that Figures 4-6 are examples, and each PPDU may include fields other than those described below, or some fields may be omitted. Also, the order of the fields is not limited to the order shown in Figures 4-6.

[0027] First, the information included in PPDU is STF (Short Training Field), LTF (Long Term Field), and SIG (Signal Field).

[0028] The beginning of the PPDU includes L-STF (Legacy-STF) 401, L-LTF (Legacy-LTF) 402, and L-SIG (Legacy-Signal) 403, which are backward compatible with the IEEE 802.11a / b / g / n / ac / ax standards.

[0029] The L-STF401 is used for PHY frame signal detection, automatic gain control (AGC), and timing detection. The L-LTF602 is used for high-precision frequency and time synchronization and acquisition of channel state information (CSI). The L-SIG403 is used to transmit control information including communication rate and length information.

[0030] Legacy devices that comply with the IEEE 802.11a / b / g / n / ac / ax standards can decode data from the various legacy fields mentioned above.

[0031] The EHT SU PPDU in Figure 4 is a PPDU used for Single User (AP and a single STA) communication. The EHT SU PPDU has L-STF401, L-LTF02, L-SIG403, RL-SIG404, EHT-SIG-A405, EHT-STF406, and EHT-LTF407 as preambles. In addition, it has a data field 408 and a packet extension 609.

[0032] The EHT ER SU PPDU in Figure 6 is a PPDU used in Extended Range (when you want to extend the communication distance) and is used for communication between an AP and a single STA. The EHT PPDU has L-STF601, L-LTF602, L-SIG603, RL-SIG604, EHT-SIG-A605, EHT-STF606, and EHT-LTF607 as preambles. Furthermore, it has a data field 608 and a packet extension 609. The EHT ER SU PPDU differs from the EHT SU PPDU in that it has restrictions on the MCS (modulation scheme and coding rate) that can be used in order to extend the communication distance.

[0033] As shown in Tables 1 and 2, EHT-SIG-A405 and EHT-ER-SU-PPDU contain the EHT-SIG-A1 and EHT-SIG-A2 information necessary for receiving the PPDU.

[0034] In this embodiment, the frequency bandwidth to be used and the information for preamble puncturing are indicated in the Bandwidth field of EHT-SIG-A1. For example, a value of 0 in the Bandwidth field indicates the use of a 20MHz bandwidth, 1 indicates 40MHz, 2 indicates 80MHz, 3 indicates 160MHz, and 4 indicates 320MHz. These values ​​also indicate that preamble puncturing mode is not used. A value of 5 in the Bandwidth field indicates 80MHz preamble puncturing with only the secondary 20MHz being punctured. Note that the frequency bandwidth that is punctured means that the frequency bandwidth is not used. A value of 6 in the Bandwidth field indicates 80MHz preamble puncturing with only one of the two 20MHz secondary 40MHz being punctured. A value of 7 in the Bandwidth field indicates 160(or 80+80)MHz preamble puncturing with only the secondary 20MHz being punctured. A Bandwidth field value of 8 indicates a 160 (or 80+80) MHz preamble puncturing where at least one 20 MHz other than the primary 40 MHz is punctured. A Bandwidth field value of 9 indicates a 320 MHz preamble puncturing where only the secondary 20 MHz is punctured. A Bandwidth field value of 10 indicates a 320 MHz preamble puncturing where only one of the two 20 MHz secondary 40 MHz is punctured. A Bandwidth field value of 11 indicates a 320 MHz preamble puncturing where at least one 20 MHz other than the primary 80 MHz is punctured. At least 4 bits are allocated to the Bandwidth field of the EHT-SIG-A1 to indicate this information.The correspondence between the Bandwidth field value and the punctured frequency band assignment described here is just one example; other assignments are acceptable as long as they represent a 320MHz bandwidth. Furthermore, the field names and bit positions / sizes are not limited to those listed in Tables 1 and 2; similar information may be stored under different field names, in different orders, or with different sizes.

[0035] [Table 1]

[0036] [Table 2]

[0037] [Table 3]

[0038] [Table 4]

[0039] The EHT MU PPDU in Figure 5 is a PPDU used for multi-user (AP and multiple STA) communication. The EHT MU PPDU has L-STF501, L-LTF502, L-SIG503, RL-SIG504, EHT-SIG-A505, EHT-SIG-B506, EHT-STF507, and EHT-LTF507 as preambles. Furthermore, it has a data field 508 and a packet extension 509.

[0040] As shown in Tables 3 and 4, EHT-SIG-A505 contains the EHT-SIG-A1 and EHT-SIG-A2 information necessary for receiving PPDU.

[0041] In this embodiment, the frequency bandwidth to be used and the information for preamble puncturing are indicated in the Bandwidth field of EHT-SIG-A1. For example, a value of 0 in the Bandwidth field indicates the use of a 20MHz bandwidth, 1 indicates 40MHz, 2 indicates 80MHz, 3 indicates 160MHz, and 4 indicates 320MHz. These values ​​also indicate that preamble puncturing mode is not used. A value of 5 in the Bandwidth field indicates 80MHz preamble puncturing with only the secondary 20MHz being punctured. Note that the frequency bandwidth that is punctured means that the frequency bandwidth is not used. A value of 6 in the Bandwidth field indicates 80MHz preamble puncturing with only one of the two 20MHz secondary 40MHz being punctured. A value of 7 in the Bandwidth field indicates 160(or 80+80)MHz preamble puncturing with only the secondary 20MHz being punctured. A Bandwidth field value of 8 indicates a 160 (or 80+80) MHz preamble puncturing where at least one 20 MHz other than the primary 40 MHz is punctured. A Bandwidth field value of 9 indicates a 320 MHz preamble puncturing where only the secondary 20 MHz is punctured. A Bandwidth field value of 10 indicates a 320 MHz preamble puncturing where only one of the two 20 MHz secondary 40 MHz is punctured. A Bandwidth field value of 11 indicates a 320 MHz preamble puncturing where at least one 20 MHz other than the primary 80 MHz is punctured. At least 4 bits are allocated to the Bandwidth field of the EHT-SIG-A1 to indicate this information.The correspondence between the Bandwidth field value and the punctured frequency band assignment described here is just one example; other assignments are acceptable as long as they represent a 320MHz bandwidth. Furthermore, the field names and bit positions / sizes are not limited to those listed in Tables 1 and 2; similar information may be stored under different field names, in different orders, or with different sizes.

[0042] As described above, preamble puncturing can be performed in EHT SU PPDU, EHT ER SU PPDU, and EHT MU PPDU used in the IEEE 802.11be standard by specifying frequency bands exceeding 160 MHz. In the above explanation, the same Bandwidth field information was used for EHT SU PPDU, EHT ER SU PPDU, and EHT MU PPDU. However, the correspondence between the Bandwidth field value and the assignment of the punctured frequency band may differ between SU ​​PPDU and MU PPDU. When preamble puncturing is performed in MU PPDU, i.e., multi-user communication, it is possible to assign communication bandwidth to different users (STAs) for each frequency width in units of 20 MHz, for example. For example, in the case of MU PPDU, i.e., multi-user communication, the number of frequency bands to be punctured may be increased compared to the case of SU PPDU, i.e., single-user communication, and the Bandwidth field value may be defined accordingly. This increases the degree of freedom in frequency band utilization in multi-user communication compared to single-user communication.

[0043] [Table 5]

[0044] [Table 6]

[0045] [Table 7]

[0046] (modified version) In the example above, preamble puncturing information was shown in the Bandwidth field of EHT-SIG-A1. Four bits were allocated to the Bandwidth field of EHT-SIG-A1 to show information when the frequency bandwidth used is 320 MHz. In the following example, the Bandwidth field of EHT-SIG-A1 is set to three bits, and a separate field, EHT-SIG-A3, is added, and these fields are used to show preamble puncturing information.

[0047] First, if the value of the Bandwidth field of EHT-SIG-A1 is 0, it indicates that the frequency bandwidth used is 20 MHz. If the value of the Bandwidth field of EHT-SIG-A1 is 1, it indicates that the frequency bandwidth used is 40 MHz. If the value of the Bandwidth field of EHT-SIG-A1 is 2, it indicates that the frequency bandwidth used is 80 MHz. If the value of the Bandwidth field of EHT-SIG-A1 is 3, it indicates that the frequency bandwidth used is 160 MHz. If the value of the Bandwidth field of EHT-SIG-A1 is 4, it indicates that the frequency bandwidth used is 320 MHz. Also, if the value of the Bandwidth field of EHT-SIG-A1 is between 0 and 4, it indicates that preamble puncturing will not be performed. Finally, if the value of the Bandwidth field of EHT-SIG-A1 is 5, it indicates that the frequency bandwidth used is 80 MHz and preamble puncturing will be performed. If the Bandwidth field value of EHT-SIG-A1 is 6, it indicates that the frequency bandwidth used is 160 MHz and that preamble puncturing will be performed. If the Bandwidth field value of EHT-SIG-A1 is 7, it indicates that the frequency bandwidth used is 320 MHz and that preamble puncturing will be performed. Furthermore, if the Bandwidth field value of EHT-SIG-A1 is between 5 and 7, the EHT-PPDU should include EHT-SIG-A3 as shown in Table 5. Note that the field names, bit positions, sizes, etc. shown in Table 5 are examples, and different names, positions, sizes, etc. may be used as long as they indicate similar information.

[0048] Table 5 shows that the EHT-SIG-A3 includes a Preamble Puncturing field indicating the frequency bandwidth to be preamble punctured. The Preamble Puncturing field in Table 5 has a bit length of 16 bits, and the bits are mapped sequentially from bit position B0 to a 20MHz bandwidth. A bit is set to 0 when the 20MHz bandwidth is used, and to 1 when it is not used, i.e., punctured. Note that the definitions of bits 0 and 1 may be reversed. In other words, Table 5 shows the frequency bandwidth to be used in bitmap format.

[0049] For example, if the frequency bandwidth used is 80 MHz and only the secondary 20 MHz is punctured, the value of the Bandwidth field in EHT-SIG-A1 should be 5. Then, in the Preamble Puncturing field of EHT-SIG-A3, only bit B1 should be set to 1, and the other bits should be set to 0. Note that the bitmap may be of variable length to match the frequency bandwidth defined in the Bandwidth field of EHT-SIG-A1. That is, it may be 4 bits when the frequency bandwidth used is 80 MHz, 8 bits when it is 160 MHz, and 16 bits when it is 320 MHz. In that case, the higher bits that are in excess of the frequency bandwidth defined in the Bandwidth field of EHT-SIG-A1 may be reserved and not used.

[0050] [Table 8]

[0051] As another variation, instead of the example in Table 5, the frequency band to be preamble punctured may be indicated as follows: If the value of the Preamble Puncturing field in EHT-SIG-A3 is 0, the entire frequency band will be used, i.e., no preamble puncturing will be performed. If the value of the Preamble Puncturing field in EHT-SIG-A3 is 1, it indicates that the lowest frequency band of 20 MHz will be punctured. If the value of the Preamble Puncturing field in EHT-SIG-A3 is 2, it indicates that 20 MHz from 20 to 40 MHz will be punctured from the lowest frequency band. If the value of the Preamble Puncturing field in EHT-SIG-A3 is 3, it indicates that 20 MHz from 40 to 60 MHz will be punctured from the lowest frequency band. The value of the Preamble Puncturing field in EHT-SIG-A3 may be defined in this way. However, the example described here is just one example, and other methods may be used.

[0052] As described above, according to this embodiment and its various modifications, preamble punturing can be properly performed even when the frequency bandwidth used for wireless LAN communication is 320 MHz. Furthermore, the AP or STA can generate an EHT-SIG-A field in the wireless LAN PPDU frame in order to perform proper preamble punturing. By communicating these PPDU frames between the AP and the STA, preamble punturing can be properly performed in wireless LAN communication between the AP and the STA.

[0053] (Other embodiments) The present invention can also be realized by supplying a program that implements one or more of the functions of the above-described embodiments to a system or device via a network or storage medium, and by having one or more processors in the computer of that system or device read and execute the program. It can also be realized by a circuit (e.g., an ASIC) that implements one or more functions.

[0054] The invention is not limited to the embodiments described above, and various modifications and variations are possible without departing from the spirit and scope of the invention. Accordingly, claims are attached to disclose the scope of the invention. [Explanation of symbols]

[0055] 102 AP 103~105 STA 201 Storage section 202 Control Unit 203 Functional Section 204 Input section 205 Output section 206 Communications Department 207 Antenna

Claims

1. A communication device capable of wireless communication based on the IEEE 802.11 standard, It has a transmission means for wirelessly transmitting an MU PPDU (Multi-User Physical Layer Protocol Data Unit) having a physical layer (PHY) preamble and data fields, The preamble includes an L-STF (Legacy Short Training Field), an L-LTF (Legacy Long Training Field) positioned immediately after the L-STF, an L-SIG (Legacy Signal Field) positioned immediately after the L-LTF, an RL-SIG positioned immediately after the L-SIG, a second Signal Field positioned immediately after the RL-SIG, which includes a first field group and a second field group, a third Signal Field positioned immediately after the second Signal Field, and an STF (Short Training Field) positioned after the third Signal Field. It has a Field and an LTF (Long Training Field) positioned after the STF, The first group of fields includes a field indicating bandwidth and a field indicating information about BSS Color, and the second group of fields includes a field consisting of a predetermined number of consecutive bits indicating information about Preamble Puncturing. The field indicating the bandwidth is configured to store a predetermined value indicating that the bandwidth is 320 MHz. A communication device characterized in that at least one bit among the predetermined number of consecutive bits indicates whether or not to puncture a bandwidth of 20 MHz.

2. The communication device has multiple antennas, The communication device according to claim 1, characterized in that the transmitting means transmits the MU PPDU via the plurality of antennas.

3. A communication device capable of wireless communication based on the IEEE 802.11 standard, It has a receiving means for wirelessly receiving an MU PPDU (Multi-User Physical Layer Protocol Data Unit) having a physical layer (PHY) preamble and data fields, The preamble includes an L-STF (Legacy Short Training Field), an L-LTF (Legacy Long Training Field) positioned immediately after the L-STF, an L-SIG (Legacy Signal Field) positioned immediately after the L-LTF, an RL-SIG positioned immediately after the L-SIG, a second Signal Field positioned immediately after the RL-SIG, which includes a first field group and a second field group, a third Signal Field positioned immediately after the second Signal Field, and an STF (Short Training Field) positioned after the third Signal Field. It has a Field and an LTF (Long Training Field) positioned after the STF, The first group of fields includes a field indicating bandwidth and a field indicating information about BSS Color, and the second group of fields includes a field consisting of a predetermined number of consecutive bits indicating information about Preamble Puncturing. The field indicating the bandwidth is configured to store a predetermined value indicating that the bandwidth is 320 MHz. A communication device characterized in that at least one bit among the predetermined number of consecutive bits indicates whether or not to puncture a bandwidth of 20 MHz.

4. The aforementioned communication device further has multiple antennas, The communication device according to claim 3, characterized in that the receiving means receives the MU PPDU via the plurality of antennas.

5. The communication device according to any one of claims 1 to 4, characterized in that the communication device is a camera having an imaging unit.

6. The communication device according to any one of claims 1 to 4, characterized in that the communication device is a printer having a printing unit.

7. The communication device according to any one of claims 1 to 4, characterized in that the communication device is a smartphone or a projector.

8. The communication device according to claim 1, characterized in that the communication device functions as a Group Owner of Wi-Fi Direct (registered trademark), and the transmission means transmits the MU PPDU to the Wi-Fi Direct Client.

9. The communication device according to claim 3, characterized in that the communication device functions as a client of Wi-Fi Direct (registered trademark), and the receiving means receives the MU PPDU from the Group Owner of Wi-Fi Direct.

10. The communication device according to claim 3, wherein the receiving means receives the MU PPDU containing video data in the data field, and the communication device further has a projection unit that performs projection based on the communicated data.

11. A communication method that performs wireless communication in accordance with the IEEE 802.11 standard, The system includes a transmission control process for wirelessly transmitting an MU PPDU (Multi-User Physical Layer Protocol Data Unit) having a physical layer (PHY) preamble and data fields. The preamble includes an L-STF (Legacy Short Training Field), an L-LTF (Legacy Long Training Field) positioned immediately after the L-STF, an L-SIG (Legacy Signal Field) positioned immediately after the L-LTF, an RL-SIG positioned immediately after the L-SIG, a second Signal Field positioned immediately after the RL-SIG, which includes a first field group and a second field group, a third Signal Field positioned immediately after the second Signal Field, and an STF (Short Training Field) positioned after the third Signal Field. It has a Field and an LTF (Long Training Field) positioned after the STF, The first group of fields includes a field indicating bandwidth and a field indicating information about BSS Color, and the second group of fields includes a field consisting of a predetermined number of consecutive bits indicating information about Preamble Puncturing. The field indicating the bandwidth is configured to store a predetermined value indicating that the bandwidth is 320 MHz. A communication method characterized in that at least one bit among the predetermined number of consecutive bits indicates whether or not to puncture a bandwidth of 20 MHz.

12. A communication method that performs wireless communication in accordance with the IEEE 802.11 standard, The system includes a receive control process for wirelessly receiving an MU PPDU (Multi-User Physical Layer Protocol Data Unit) having a physical layer (PHY) preamble and data fields. The preamble includes an L-STF (Legacy Short Training Field), an L-LTF (Legacy Long Training Field) positioned immediately after the L-STF, an L-SIG (Legacy Signal Field) positioned immediately after the L-LTF, an RL-SIG positioned immediately after the L-SIG, a second Signal Field positioned immediately after the RL-SIG, which includes a first field group and a second field group, a third Signal Field positioned immediately after the second Signal Field, and an STF (Short Training Field) positioned after the third Signal Field. It has a Field and an LTF (Long Training Field) positioned after the STF, The first group of fields includes a field indicating bandwidth and a field indicating information about BSS Color, and the second group of fields includes a field consisting of a predetermined number of consecutive bits indicating information about Preamble Puncturing. The field indicating the bandwidth is configured to store a predetermined value indicating that the bandwidth is 320 MHz. A communication method characterized in that at least one bit among the predetermined number of consecutive bits indicates whether or not to puncture a bandwidth of 20 MHz.

13. The communication method according to claim 12, characterized in that the MU PPDU is received via a plurality of antennas in the reception control step.

14. A program for operating a computer as a communication device according to any one of claims 1 to 10.

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