Communication apparatus, information processing apparatus, communication method, and storage medium

Abstract

The invention relates to a communication apparatus, an information processing apparatus, a communication method, and a storage medium. A communication device includes a transmission section for transmitting an MU PPDU frame including a preamble and a data field, the preamble including a first signal field and a second signal field, the first signal field including a first field indicating information of a modulation scheme and a coding rate (modulation and coding scheme (MCS)) of the second signal field, and the second signal field including a second field indicating information of a modulation scheme and a coding rate (MCS) of the second signal field. A second signal field is a field transmitted immediately after transmission of the first signal field, the second signal field including a second field representing information of a modulation scheme and a coding rate of the data field, the data field including data modulated and coded according to the modulation scheme and the coding rate represented by the second subfield, and the second field is configured to be able to specify a data rate equal to or greater than a data rate of an MCS composed of 4096 QAM and a 3 / 4 coding rate.

Description

[0001] This application is a divisional application of an invention patent application with an application date of February 5, 2020, application number 202080016950.7 (international application number PCT / JP2020 / 004257), and invention name “Communication device, information processing device, communication method, and computer-readable storage medium”. Technical Field

[0002] The present invention relates to a communication control technology in a wireless LAN. Background Art

[0003] In recent years, with the development of information and communication technology, Internet usage has increased year by year, and various communication technologies have been developed to cope with the increase in demand. In particular, wireless local area network (wireless LAN) technology has achieved an increase in the throughput of wireless LAN terminals for packet data, audio, video, etc. in Internet communication, and various technical developments are still actively underway.

[0004] In the development of wireless LAN technology, the extensive standardization work of IEEE (Institute of Electrical and Electronics Engineers) 802, as a standardization organization for wireless LAN technology, has played an important role. As one of the wireless LAN communication standards, the IEEE802.11 standard is well known, including standards such as IEEE802.11n / a / b / g / ac and IEEE802.11ax. For example, IEEE802.11ax achieves a high peak throughput of up to 9.6 Gbps, and also uses OFDMA (Orthogonal Frequency Division Multiple Access) (PTL 1) to improve communication speed in congested conditions.

[0005] In recent years, in order to further improve the throughput, a research group called IEEE802.11EHT (Extremely High Throughput) has been established as a successor standard to IEEE802.11ax. As one of the measures to improve the throughput of the goal of IEEE802.11EHT, the introduction of 2048QAM or 4096QAM as a multi-value modulation scheme has been examined. Please note that QAM is the abbreviation of Quadrature Amplitude Modulation. According to this multi-value modulation scheme, one symbol can send multiple bits (11 bits / symbol in 2048QAM and 12 bits / symbol in 4096QAM), and a further improvement in throughput can be achieved.

[0006] Reference List

[0007] Patent Literature

[0008] PTL 1: Japanese Patent Laid-Open No. 2018-50133 Summary of the invention

[0009] Technical issues

[0010] As described above, in IEEE802.11EHT, data transmission using the 2048QAM or 4096QAM modulation scheme has been examined. However, in the conventional standards of wireless LAN, a mechanism configured to notify that 2048QAM or 4096QAM is used as the modulation scheme for data to be transmitted has not been defined.

[0011] In view of the above-mentioned problems, the present invention provides a mechanism configured to notify that 2048QAM or 4096QAM is used as a modulation scheme for data to be transmitted.

[0012] Solutions to the problem

[0013] A communication device according to one aspect of the present invention has the following features. That is, a communication device is provided, the communication device including a transmitting unit for transmitting a radio frame including a preamble and a data field of a physical (PHY) layer, wherein the preamble includes L-STF (legacy short training field, "Legacy Short Training Field"), L-LTF (legacy long training field, "Legacy Long Training Field"), L-SIG (legacy signal field, "LegacySignal Field"), EHT-SIG-A (extremely high throughput signal A field, "Extremely High ThroughputSignal AField"), EHT-STF (EHT short training field, "EHT Short Training Field"), and EHT-LTF (EHT long training field, "EHT Long Training Field"). The EHT-SIG-A includes a subfield indicating information on a modulation scheme and a coding rate (MCS, “Modulation and Coding Scheme”), the data field includes data modulated and encoded according to the modulation scheme and coding rate indicated by the subfield, and the subfield is constructed to be able to specify at least one of 2048QAM and 4096QAM as the modulation scheme.

[0014] Beneficial effects of the present invention

[0015] According to the present invention, data transmission using the 2048QAM or 4096QAM modulation scheme can be notified.

[0016] Other features and advantages of the present invention will become apparent from the following description in conjunction with the accompanying drawings.Please note that the same reference numerals represent the same or similar components throughout the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0018] Figure 1 is a diagram showing an example of a configuration of a network;

[0019] Figure 2 is a block diagram showing an example of a functional configuration of an AP;

[0020] Figure 3 is a block diagram showing an example of a hardware configuration of an AP;

[0021] Figure 4 is a flow chart showing a process performed by an AP;

[0022] Figure 5 is a sequence diagram illustrating a process performed in a wireless communication network;

[0023] Figure 6 is a diagram showing an example of a PHY frame structure of an EHT SU PPDU;

[0024] Figure 7 is a diagram showing an example of a PHY frame structure of an EHT ER PPDU; and

[0025] Figure 8 is a view showing an example of a PHY frame structure of an EHT MU PPDU. DETAILED DESCRIPTION

[0026] Below, the embodiments will be described in detail with reference to the accompanying drawings. Please note that the following embodiments are not intended to limit the scope of the claimed invention. A plurality of features are described in the embodiments, but the invention is not limited to requiring all such features, but a plurality of such features can be appropriately combined. In addition, in the accompanying drawings, the same reference numerals are assigned to the same or similar structures, and their redundant descriptions are omitted.

[0027] (Network Structure)

[0028] Figure 1An example of the construction of a wireless communication network according to the present embodiment is shown. The wireless communication network is constructed to include three STAs (STA 103, STA 104, and STA 105) that are devices (EHT devices) that comply with the IEEE802.11EHT (Extremely High Throughput) standard and one access point (AP 102). Please note that the name "IEEE802.11EHT" is set for convenience and may be other names when the standard is established, but this specification and the attached claims are intended to cover all standards that can support the processing described later. AP 102 can be considered as a form of STA because it has the same functions as STA 103 to STA 105 in addition to the relay function. STAs within circle 101 can communicate with AP 102, and circle 101 indicates the area where the signal sent by AP 102 reaches. AP 102 communicates with STA 103 to STA 105 according to the wireless communication method of the IEEE802.11EHT standard. The AP 102 may establish a radio link with each of the STAs 103 to 105 via a connection process (eg, an association process) conforming to the IEEE 802.11 series of standards.

[0029] Please note, Figure 1 The configuration of the wireless communication network shown is merely an example for description, and for example, a network including a plurality of EHT devices and conventional devices (communication devices conforming to the IEEE802.11a / b / g / n / ax standards) may be formed in a wider area. In addition, the arrangement of the communication devices is not limited to Figure 1 As shown, the following discussion also applies to various positional relationships of various types of communication equipment.

[0030] (AP Structure)

[0031] Figure 2 2 is a block diagram showing a functional configuration of the AP 102. The AP 102 includes a wireless LAN control unit 201, a frame generation unit 202, a signal analysis unit 203, and a UI (User Interface) control unit 204 as an example of its functional configuration.

[0032] The wireless LAN control unit 201 may be configured to include one or more antennas 205 and circuits configured to transmit or receive radio signals (radio frames) to or from other wireless LAN devices, and a program configured to control them. The wireless LAN control unit 201 performs communication control of the wireless LAN based on the frame generated by the frame generation unit 202 in accordance with the IEEE802.11 series of standards.

[0033] The frame generation unit 202 generates a frame to be transmitted by the wireless LAN control unit 201 based on the analysis result of the signal analysis unit 203 on the signal received by the wireless LAN control unit 201. The frame generation unit 202 can create a frame without depending on the analysis result of the signal analysis unit 203. The signal analysis unit 203 analyzes the signal received by the wireless LAN control unit 201. The UI control unit 204 accepts a user (not shown) of the AP 102 in the input unit 304 ( Figure 3 ) and performs control of sending a control signal corresponding to the operation to each component, or controls the output unit 305 ( Figure 3 ) output (including display, etc.).

[0034] Figure 3 The AP 102 includes a storage unit 301, a control unit 302, a function unit 303, an input unit 304, an output unit 305, a communication unit 306, and one or more antennas 205 as an example of its hardware configuration.

[0035] The storage unit 301 is composed of both or one of a ROM and a RAM, and stores programs for performing various operations described later and various information such as communication parameters for wireless communication. Note that in addition to memories such as ROM and RAM, a storage medium such as a floppy disk, a hard disk, an optical disk, a magneto-optical disk, a CD-ROM, a CD-R, a magnetic tape, a nonvolatile memory card, or a DVD can be used as the storage unit 301.

[0036] The control unit 302 is composed of, for example, one or more processors such as a CPU and an MPU, an ASIC (Application Specific Integrated Circuit), a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array), etc. Here, CPU is an acronym for a central processing unit, and MPU is an acronym for a microprocessing unit. The control unit 302 executes a program stored in the storage unit 301, thereby controlling the entire AP 102. Note that the control unit 302 can control the entire AP 102 through the cooperation of the program stored in the storage unit 301 and the OS (Operating System).

[0037] In addition, the control unit 302 controls the function unit 303 to perform a predetermined process such as image capture, printing, or projection. The function unit 303 is hardware used by the AP 102 to perform a predetermined process. For example, if the AP 102 is a camera, the function unit 303 is an image capture unit and performs an image capture process. For example, if the AP 102 is a printer, the function unit 303 is a printing unit and performs a printing process. For example, if the AP 102 is a projector, the function unit 303 is a projection unit and performs a projection process. The data to be processed by the function unit 303 may be data stored in the storage unit 301, or may be data communicated with a STA or other AP via the communication unit 306 described later.

[0038] The input unit 304 accepts various operations from the user. The output unit 305 performs various types of outputs for the user. Here, the output of the output unit 305 includes at least one of a display on a screen, an audio output of a speaker, a vibration output, etc. Please note that both the input unit 304 and the output unit 305 can be implemented by one module, such as a touch panel.

[0039] The communication unit 306 controls wireless communication conforming to the IEEE802.11EHT standard, or controls wireless communication conforming to Wi-Fi or IP (Internet Protocol) communication (including modulation and coding processing). In addition, the communication unit 306 controls one or more antennas 205 to send / receive radio signals for wireless communication. In this case, MIMO (Multiple Input Multiple Output) communication using spatial streams is possible. The communication unit 306 is a so-called radio chip, which itself may include one or more processors and memories. The AP 102 communicates content such as image data, file data, and video data with other communication devices through the communication unit 306. Note that Figure 2 The functions of the constituent elements shown in FIG. 1 may be partially implemented by software.

[0040] (STA structure)

[0041] The functional configuration and hardware configuration of STA 103 to STA 105 are respectively the same as the functional configuration of AP 102 described above ( Figure 2 ) and hardware configuration ( Figure 3 ) is the same. That is, each of STA103 to STA105 may be configured to include a wireless LAN control unit 201, a frame generation unit 202, a signal analysis unit 203, and a UI control unit 204 as its functional configuration, and include a storage unit 301, a control unit 302, a functional unit 303, an input unit 304, an output unit 305, a communication unit 306, and one or more antennas 205 as its hardware configuration.

[0042] (Processing process)

[0043] Next, we will refer to Figure 4 and Figure 5 Describes the procedures for processing performed by the AP 102 configured as described above and Figure 1 The sequence of processing performed by the wireless communication system shown. Figure 4 1 is a flowchart showing the processing performed by the AP 102. When the control unit 302 of the AP 102 executes the control program stored in the storage unit 301 and performs calculation and processing of information and control of various hardware, it can be realized. Figure 4 The flowchart shown in . Figure 5 A sequence diagram showing a process performed by a wireless communication system.

[0044] AP 102 performs connection processing in accordance with the IEEE802.11 series standards for each of STA 103 to STA 105 (steps S401, F501). That is, frames such as probe request / response, association request / response and Auth (authentication) are sent / received between AP 102 and each of STA 104 and STA 105, thereby establishing a radio link. Next, AP 102 decides the modulation scheme and code rate to be used for wireless communication as the value (level) of MCS (modulation and coding scheme). MCS shows a combination of a modulation scheme and a coding rate as an index. The relationship between the MCS value used in this embodiment and the modulation scheme and coding rate corresponding to the value of MCS will be described later with reference to Table 3. The value of MCS can be determined by the signal analysis unit 203 according to the reception state in AP 102. For example, the value of MCS may be determined based on the quality and strength of signals received from each STA (SNR (Signal-to-Noise Ratio), SINR (Signal-to-Interference Noise Ratio), RSSI (Received Signal Strength Indicator), RSSQ (Received Signal Strength Quality)), etc. In addition, the value of MCS may be predetermined in the wireless communication system. The value of MCS may be determined by an operation of a user (not shown) of AP 102 on input unit 304. As described above, the method of determining the value of MCS is not limited to a specified method.

[0045] Next, AP 102 decides communication parameters including the value of the MCS decided in step S402 or F502, and these parameters are included in the radio frame to be transmitted (steps S403, F503). Next, AP 102 transmits data to STA 103 to STA 105 in the form of a radio frame including the decided transmission data communication parameters and data (steps S404, F504).

[0046] (Frame structure)

[0047] Figures 6 to 8 An example of a PHY (physical layer) frame structure of a PPDU defined by the IEEE 802.11 EHT standard and transmitted in step S404 or F504 is shown. Note that PPDU is an abbreviation of a physical layer (PHY) protocol data unit. Figure 6 An example of a PHY frame structure of an EHT SU PPDU which is a PPDU for single-user (SU) communication (between an AP and a single STA) is shown. Figure 7 An example of a PHY frame structure of an EHT ER PPDU which is a PPDU for communication in an extended area (communication distance) (extended range) is shown. The EHT ER PPDU is used for communication between an AP and a single STA. Figure 8 An example of a PHY frame structure of an EHT MU PPDU which is a PPDU for multi-user (MU) communication (between an AP and multiple STAs) is shown.

[0048] Figures 6 to 8 The information generally included in the PPDU shown is STF (Short Training Field), LTF (Long Term Field) and SIG (Signal Field). Figure 6 For example, the PPDU header includes L (legacy)-STF 601, L-LTF 602 and L-SIG 603 that are backward compatible with the IEEE802.11a / b / g / n / ax standards. L-STF 601 is used for detection of PHY frame signals, automatic gain control (AGC), timing detection, etc. The L-LTF 602 arranged immediately after the L-STF 601 is used for high-precision frequency / time synchronization, acquisition of propagation channel information (CSI), etc. The L-SIG 603 arranged immediately after the L-LTF 602 is used to send control information, which includes information such as data transmission rate and PHY frame length. Legacy devices that comply with the IEEE802.11a / b / g / n / ax standards can decode the data of the above-mentioned various legacy fields (L-STF 601, L-LTF 602 and L-SIG 603). Various types of legacy fields are also included in Figure 7 and Figure 8 In the PPDU shown.

[0049] Next to the above-mentioned L-STF 601, L-LTF 602 and L-SIG 603, Figure 6 The illustrated EHT SU PPDU includes RL-SIG 604, EHT-SIG-A 605, EHT-STF 606, EHT-LTF 607, data field 608, and packet extension 609. RL-SIG 604 may not exist. EHT-SIG-A 605 is arranged immediately after L-SIG 603, EHT-STF 606 is arranged immediately after EHT-SIG-A 605, and EHT-LTF 607 is arranged immediately after EHT-STF 606. Note that the fields including L-STF 601, L-LTF 602, L-SIG 603, RL-SIG 604, EHT-SIG-A 605, EHT-STF 606, and EHT-LTF 607 are referred to as preambles. The EHT-SIG-A 605 includes information required for receiving the PPDU, such as EHT-SIG-A1 and EHT-SIG-A2. Subfields constituting the EHT-SIG-A1 and EHT-SIG-A2 included in the EHT-SIG-A 605 and their descriptions are shown in Tables 1 and 2.

[0050] [Table 1]

[0051]

[0052]

[0053] [Table 2]

[0054]

[0055]

[0056] The MCS decided in step S402 or F502 is shown by 5 bits of the MCS subfield (B3-B7) in EHT-SIG-A1 (Table 1). Table 3 shows an example of the correspondence between the MCS value shown in the MCS subfield and the modulation scheme and coding rate corresponding to the MCS value. In Table 3, the value of MCS is from 0 to 17, and the modulation scheme and coding rate are set corresponding to the respective values ​​of MCS. In addition, as shown in Table 3, the MCS subfield is constructed to specify at least one of 2048QAM and 4096QAM as the modulation scheme. The MCS value corresponding to the 2048QAM modulation scheme is 12 to 14, and the MCS value corresponding to the 4096QAM modulation scheme is 15 to 17. Even in the same modulation scheme, if the value of MCS changes, the coding rate to be used will also change. For example, if the value of MCS is 15, the coding rate is 2 / 4. If the value of MCS is 16, the coding rate is 3 / 4. If the value of MCS is 17, the coding rate is 5 / 6. Note that in Table 3, three different coding rates are prepared corresponding to each of the 2048QAM and 4096QAM modulation schemes. However, the present invention is not limited thereto, and four or more different coding rates may be prepared. Although a 5-bit MCS subfield is prepared in this embodiment, since more multi-value modulation schemes may be used in subsequent standards of the IEEE 802.11EHT standard, it is possible to ensure that the number of bits of the MCS subfield exceeds 5 bits, for example, 6 bits.

[0057] [Table 3]

[0058]

[0059]

[0060] The EHT-STF 606 next to the EHT-SIG-A 605 is an abbreviation of the EHT short training field, and its main purpose is to improve the automatic gain control in MIMO transmission. The EHT-LTF 607 is an abbreviation of the EHT long training field, and provides a means for estimating the MIMO channel to the receiver. The data field 608 includes data modulated and encoded using a modulation scheme and a coding rate corresponding to the value of the MCS represented by the MCS subfield of the above-mentioned EHT-SIG-A1. The communication device (AP) on the transmitting side modulates and encodes the data in the data field 608, stores the MCS information (the value (level) of the MCS) used for modulation and encoding in the MCS subfield of the EHT-SIG-A1, and sends the PPDU to the communication device (STA) on the receiving side. The communication device on the receiving side can demodulate and decode the received data in the data field according to the MCS information contained in the MCS subfield of the EHT-SIG-A1 of the received PPDU.

[0061] As mentioned above, Figure 7 The EHT ER PPDU shown is a PPDU for extending the communication distance and is used for communication between the AP and a single STA. The EHT ER PPDU includes L-STF 701, L-LTF 702, L-SIG 703, RL-SIG 704, EHT-SIG-A 705, EHT-STF 706, EHT-LTF 707, data field 708, and packet extension 709. RL-SIG 704 may not exist. L-LTF 702 is arranged immediately after L-STF 701, L-SIG 703 is arranged immediately after L-LTF 702, EHT-SIG-A 705 is arranged immediately after L-SIG 703, EHT-STF 706 is arranged immediately after EHT-SIG-A 705, and EHT-LTF 707 is arranged immediately after EHT-STF 706. Note that the fields including L-STF 701, L-LTF 702, L-SIG 703, RL-SIG 704, EHT-SIG-A 705, EHT-STF 706, and EHT-LTF 707 are referred to as preambles. Information contained in each field is the same as Figure 6 The contents in the EHT SU PPDU shown are the same, and their description will be omitted. Note that in EHT-SIG-A705, the value of MCS can be set in the MCS subfield (B3-B7) of EHT-SIG-A1, as Figure 6 The EHT SUPPDU shown.

[0062] Figure 8The EHT MU PPDU shown is a PPDU for communication of MU, as described above. The EHT MU PPDU includes L-STF 801, L-LTF 802, L-SIG 803, RL-SIG 804, EHT-SIG-A 805, EHT-SIG-B 806, EHT-STF 807, EHT-LTF 808, data field 809, and packet extension 810. RL-SIG 804 may not exist. The L-LTF 802 is arranged immediately after the L-STF 801, the L-SIG 803 is arranged immediately after the L-LTF 802, the EHT-SIG-A 805 is arranged immediately after the L-SIG 803, the EHT-SIG-B 806 is arranged immediately after the EHT-SIG-A 805, the EHT-STF 807 is arranged immediately after the EHT-SIG-B 806, and the EHT-LTF 808 is arranged immediately after the EHT-STF 807. Note that a field including the L-STF 801, the L-LTF 802, the L-SIG 803, the RL-SIG 804, the EHT-SIG-A 805, the EHT-SIG-B 806, the EHT-STF 807, and the EHT-LTF 808 is referred to as a preamble. In the data field 809, data of a plurality of STAs (users) are transmitted by MIMO or OFDMA (Orthogonal Frequency-Division Multiple Access).

[0063] The EHT-SIG-A 805 includes information necessary for receiving the PPDU, such as EHT-SIG-A1 and EHT-SIG-A2. Subfields constituting the EHT-SIG-A1 and EHT-SIG-A2 included in the EHT-SIG-A 805 and their descriptions are shown in Tables 4 and 5.

[0064] [Table 4]

[0065]

[0066]

[0067] [Table 5]

[0068]

[0069]

[0070] The EHT-SIG-B 806 includes information required for receiving the PPDU, such as a common field and a user block field. Subfields constituting the common field and the user block field included in the EHT-SIG-B 806 and their descriptions are shown in Tables 6 and 7.

[0071] [Table 6]

[0072]

[0073]

[0074] [Table 7]

[0075]

[0076] EHT-SIG-B 806 includes a common field for information common to all STAs (users) and as many user block fields as the number of STAs performing communication. In addition, the content of the user field in the user block field changes depending on whether the AP performs MIMO communication. Table 8 shows the description of the user field in the case of non-MIMO communication, and Table 9 shows the description of the user field in the case of MU-MIMO communication.

[0077] [Table 8]

[0078]

[0079] [Table 9]

[0080]

[0081]

[0082] In Tables 8 and 9, the modulation scheme and coding rate (i.e., the value (level) of MCS) used for the modulation and coding process of data in the data field of each STA are represented by the 5-bit MCS subfield. The example of the correspondence between the value of MCS shown in the MCS subfield and the modulation scheme and coding rate corresponding to the value of MCS is the same as shown in Table 3.

[0083] When the frame structure of EHT SU PPDU, EHT ER PPDU, and EHT MU PPDU, which are PPDUs used in the IEEE 802.11 EHT standard according to the present embodiment, is used in the above manner, it can be notified that data is transmitted using a 2048QAM or 4096QAM modulation scheme. Note that in addition to the AP 102 and STAs 103 to 105 as communication devices, an information processing device (e.g., a radio chip) for generating the above-mentioned PHY preamble code can also implement the present invention.

[0084] Please note, Figure 6 The IEEE 802.11a / b / g / n / ax standard has a frame structure that is backward compatible. If backward compatibility does not need to be ensured, the L-STF and L-LTG fields can be omitted. Instead, the EHT-STF and EHT-LTF can be inserted. Please note that the respective fields of each PPDU do not necessarily follow Figures 6 to 8 The order shown in each may include Figures 6 to 8 The new fields are shown in the various fields.

[0085] (Other embodiments)

[0086] The present invention can be implemented by the following processing: providing a program for implementing one or more functions of the above-mentioned embodiments to a system or device via a network or storage medium, and causing one or more processors in a computer of the system or device to read out and execute the program. The present invention can also implement one or more functions through a circuit (e.g., ASIC).

[0087] The present invention is not limited to the above-described embodiments, and various changes and modifications can be made within the spirit and scope of the present invention. Therefore, in order to make the public aware of the scope of the present invention, the following claims are made.

Claims

1. A communication device, characterized in that: The invention comprises a transmitting unit, wherein the transmitting unit is used to transmit a multi-user PCLP protocol data unit frame including a preamble code and a data field of a physical layer, wherein the multi-user PCLP protocol data unit is MU PPDU, The preamble includes a first signal field and a second signal field. The first signal field includes a first field indicating information of a modulation scheme and a coding rate of the second signal field, the modulation scheme and the coding rate being a modulation and coding scheme MCS, The second signal field is a field transmitted immediately after the transmission of the first signal field, The second signal field includes a second field indicating information of a modulation scheme and a coding rate of the data field, The data field includes data modulated and encoded according to a modulation scheme and a coding rate indicated by the second subfield, and The second field is constructed to be able to specify a data rate equal to or greater than a data rate of an MCS consisting of 4096QAM and a 3 / 4 coding rate.

2. The communication device according to claim 1, wherein: The MCS to be designated in the first field is selected from among a predetermined number of MCSs, wherein an MCS having a data rate greater than a data rate of an MCS composed of 64QAM modulation and 1 / 2 coding rate is not designated in the first field.

3. The communication device according to claim 1, wherein: The second signal field includes a common field and a user field, the common field including information common to one or more users, the user field indicating information of each MCS of a data field for each user among the one or more users.

4. The communication device according to claim 1, wherein: Two or more user fields corresponding to a destination of the MU PPDU are included in the second signal field, Each of the user fields includes a STA-ID field corresponding to a destination and the second field, and The communication device further includes a determination section for determining a value to be stored in the second field based on a communication quality between the communication device and a destination to which the MU PPDU is transmitted. 5 . The communication device according to claim 1 , further comprising a setting section for setting the MCS to be used in data communication based on a user operation.

6. A communication device, characterized in that: The invention comprises a receiving unit, wherein the receiving unit is used to receive a multi-user PCLP protocol data unit frame including a preamble code and a data field of a physical layer, wherein the multi-user PCLP protocol data unit is MU PPDU, The preamble includes a first signal field and a second signal field. The second signal field is a field received immediately after reception of the first signal field, The first signal field includes a first field indicating information of a modulation scheme and a coding rate of the second signal field, the modulation scheme and the coding rate being a modulation and coding scheme MCS, The data field includes data modulated and encoded according to a modulation scheme and a coding rate indicated by the second field, and The second field is constructed to be able to specify a data rate equal to or greater than a data rate of an MCS consisting of 4096QAM and a 3 / 4 coding rate.

7. The communication device according to claim 6, wherein: The MCS to be specified in the first field is selected from a predetermined number of MCSs, wherein an MCS having a data rate greater than an MCS consisting of 64QAM modulation and a 1 / 2 coding rate is not specified in the first field, and the second signal field includes a second field indicating information on the modulation scheme and coding rate MCS of the data field.

8. The communication device according to claim 1 or 6, characterized in that: The first field is formed of a first predetermined number of bits and the second field is formed of a second predetermined number of bits, wherein the second predetermined number is greater than the first predetermined number.

9. The communication device according to claim 1 or 6, wherein: Among the multiple second values ​​that can be stored in the second field, there are at least two values ​​corresponding to 4096QAM as the modulation scheme, a first value of the at least two values ​​is a value indicating that the modulation scheme is 4096QAM and the coding rate is 3 / 4, and a second value of the at least two values, which is different from the first value of the at least two values, is a value indicating that the modulation scheme is 4096QAM and the coding rate is 5 / 6.

10. The communication device according to claim 1 or 6, wherein: The communication device is a printing device.

11. The communication device according to claim 1 or 6, wherein: The communication device is a camera device. 12 . The communication device according to claim 1 , further comprising a projection unit for performing projection processing.

13. An information processing device, characterized in that: The invention comprises a generating unit, wherein the generating unit is used to generate a multi-user PCLP protocol data unit frame including a preamble code and a data field of a physical layer, wherein the multi-user PCLP protocol data unit is MUPPDU, The preamble includes a first signal field and a second signal field. The second signal field is a field placed immediately after placement of the first signal field in the generated MU PPDU, The first signal field includes a first field indicating information of a modulation scheme and a coding rate of the second signal field, the modulation scheme and the coding rate being a modulation and coding scheme MCS, The second signal field includes a second field indicating information of a modulation scheme and a coding rate MCS of the data field, The data field includes data modulated and encoded according to a modulation scheme and a coding rate indicated by the second field, and The second field is constructed to be able to specify a data rate equal to or greater than a data rate of an MCS consisting of 4096QAM and a 3 / 4 coding rate.

14. A communication method for transmitting a multi-user PCLP protocol data unit frame including a preamble and a data field of a physical layer, wherein the multi-user PCLP protocol data unit is MU PPDU, in, The preamble includes a first signal field and a second signal field, The second signal field is a field transmitted immediately after the transmission of the first signal field, The first signal field includes a first field indicating information of a modulation scheme and a coding rate of the second signal field, the modulation scheme and the coding rate being a modulation and coding scheme MCS, The data field includes data modulated and encoded according to a modulation scheme and a coding rate indicated by the second field, and The second field is constructed to be able to specify a data rate equal to or greater than a data rate of an MCS consisting of 4096QAM and a 3 / 4 coding rate.

15. A communication method for receiving a multi-user PCLP protocol data unit frame including a preamble and a data field of a physical layer, wherein the multi-user PCLP protocol data unit is MU PPDU, in, The preamble includes a first signal field and a second signal field, The second signal field is a field received immediately after reception of the first signal field, The first signal field includes a first field indicating information of a modulation scheme and a coding rate of the second signal field, the modulation scheme and the coding rate being a modulation and coding scheme MCS, The data field includes data modulated and encoded according to a modulation scheme and a coding rate indicated by the second field, and The second field is constructed to be able to specify a data rate equal to or greater than a data rate of an MCS consisting of 4096QAM and a 3 / 4 coding rate.

16. The communication method according to claim 14 or 15, characterized in that: The first field is formed of a first predetermined number of bits and the second field is formed of a second predetermined number of bits, wherein the second predetermined number is greater than the first predetermined number.

17. A computer-readable storage medium storing a program configured to cause a computer to function as the information processing apparatus as defined in claim 1 or 6.

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