Communication device and communication method

Abstract

This communication device is provided with: a reception circuit that receives information pertaining to at least one of a plurality of modes which pertain to the allocation of a common data signal to a plurality of sub-carrier groups; and a control circuit that, on the basis of the information pertaining to the at least one mode, controls the synthesis of the signal allocated to the plurality of sub-carrier groups.

Description

Technical Field

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

Background Art

[0002] As a successor standard to 802.11ax (hereinafter referred to as "11ax"), which is a standard of the Institute of Electrical and Electronics Engineers (IEEE) 802.11, the technical specification of 802.11be (hereinafter referred to as "11be") is being advanced in Task Group (TG) be.

Prior Art Documents

Non-Patent Documents

[0003]

Non-Patent Document 1

Non-Patent Document 2

Non-Patent Document 3

Non-Patent Document 4

Non-Patent Document 5

Summary of the Invention

[0004] However, there is room for consideration regarding methods for expanding coverage in wireless communication.

[0005] Non-limiting embodiments of the present disclosure contribute to providing a communication device and a communication method for expanding coverage in wireless communication.

[0006] A communication device according to an embodiment of the present disclosure includes a receiving circuit that receives information regarding at least one of a plurality of modes related to the allocation of a common data signal to a plurality of sub-carrier groups, and a control circuit that controls the combination of signals allocated to the plurality of sub-carrier groups based on the information regarding the mode.

[0007] These general or specific aspects may be implemented in a system, device, method, integrated circuit, computer program, or recording medium, or may be implemented in any combination of a system, device, method, integrated circuit, computer program, and recording medium.

[0008] According to an embodiment of the present disclosure, coverage in wireless communication can be expanded.

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

Brief Description of the Drawings

[0010]

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Embodiments for Carrying Out the Invention

[0011] Hereinafter, each embodiment of the present disclosure will be described in detail with reference to the drawings.

[0012] [Dual Carrier Modulation (DCM)] In 11be, for example, DCM is being discussed for the purpose of extending the communication range (also called coverage, for example) of Low Power Indoor (LPI) terminals in the 6 GHz band (see, for example, Non-Patent Document 1).

[0013] FIG. 1 shows a High Efficient Single User Physical Layer Convergence Procedure Protocol Data Unit (HE SU PPDU) format as an example of the frame format of DCM.

[0014] In DCM, for example, a plurality (for example, all) of data subcarriers are split into two. For example, a group of the split data subcarriers is called a "subchannel". Also, in DCM, for example, the same data (payload) is assigned to each subchannel, and individual modulation mapping is performed on the subchannels.

[0015] For example, in 11be, two types of DCM have been proposed.

[0016] The first method is a method of setting (in other words, limiting) DCM to Modulation and Coding Scheme (MCS) 0 and the number of spatial streams (for example, Spatial Stream (SS)) = 1. This method is called Binary Phase-Shift Keying (BPSK)-DCM, for example (see, for example, Non-Patent Document 2).

[0017] The second method is to replicate multiple BPSK-DCM signals in the non-punctured frequency bandwidth of the 6 GHz band (e.g., Bandwidth (BW) or channel BW) and transmit them to a single user (or also called a terminal (STA: Station)). This method is called, for example, BPSK-DCM-duplicate (DUP) (see, for example, Non-Patent Document 3). For example, BPSK-DCM signals with a bandwidth of 40 / 80 / 160 MHz may be replicated and transmitted using a non-punctured frequency bandwidth of 80 / 160 / 320 MHz in the 6 GHz band, respectively.

[0018] Figure 2 is a diagram showing an example of the frame format (PPDU format) of BPSK-DCM. In the case of BPSK-DCM, the two payload parts correspond to two groups of divided data subcarriers. Figure 3 is a diagram showing an example of the frame format of BPSK-DCM-DUP. In the case of BPSK-DCM-DUP, BPSK-DCM is applied to the data subcarriers in the lower half of the transmission bandwidth and replicated in the upper half of the transmission bandwidth. For example, the presence or absence of BPSK-DCM and BPSK-DCM-DUP may be notified to the STA in the MCS field. Note that the MCS field may be included in a signaling field such as the Extreme High Throughput (EHT)-SIG field shown in FIGS. 2 and 3. Also, the identification information (e.g., called MCS index or EHT-MCS index) included in the MCS field is To Be Determined (TBD) in the formulation of the 11be technical specification.

[0019] [non-High Throughput (HT) duplicate] Similar to DCM, there is "non-HT duplicate" as a method of allocating data common to multiple sub-channels (see, for example, Non-Patent Document 4). FIG. 4 is a diagram showing an example of the frame format (PPDU format) of non-HT duplicate. In non-HT duplicate, for example, in the case of transmission using a BW of 40 MHz or more (80 MHz in the example of FIG. 4), the BW is divided into sub-channels in units of 20 MHz, and data common to each sub-channel is allocated.

[0020] As described above, an example of a method of expanding coverage by allocating common data to multiple sub-channels has been explained.

[0021] However, the gain obtained by a method such as DCM or non-HT duplicate for an LPI terminal in the 6 GHz band may be insufficient for coverage expansion.

[0022] For example, the transmission power density (Power Spectrum Density (PSD)) of the band available to an LPI terminal in the 6 GHz band is smaller than that of the band available to a terminal in the 5 GHz band (in other words, the transmission power density is limited). Therefore, even for an LPI terminal in the 6 GHz band where the coverage tends to be narrower compared to the 5 GHz band, it is expected to achieve the same coverage expansion as a terminal in the 5 GHz band. In other words, the expected method of coverage expansion (also called a mode, for example) may differ depending on communication situations such as the communication frequency band.

[0023] In one embodiment of the present disclosure, a method of improving coverage and enhancing communication quality in wireless communication will be described.

[0024] [Hybrid Automatic Repeat Request (HARQ)] In 11be, for example, "HARQ", which is a technique for storing a signal with a signal error in a buffer and improving the reception quality (or communication quality) by combining the signal stored in the buffer and the retransmission signal, is being discussed.

[0025] In HARQ in 11be, for example, a retransmission method called Incremental Redundancy (IR) is being considered.

[0026] FIG. 5 is a diagram showing an example of a circular buffer (or cyclic buffer) used in IR. The circular buffer is a buffer including an encoded sequence data and an encoded sequence composed of a parity corresponding to the encoded sequence data. A buffer index is allocated by dividing the encoded sequence included in the circular buffer by the transmission block size. The circular buffer has a property that when the buffer index exceeds the end of the buffer, it returns to the head of the buffer. IR is a method for improving the coding gain by transmitting an encoded sequence including different parity bits according to the number of transmissions based on, for example, the transmission start position (e.g., called Redundancy version (RV)) of the encoded sequence stored in the circular buffer on the transmission side, and combining (hereinafter referred to as "HARQ combining") on the reception side (see, for example, Non-Patent Document 5). For example, when retransmitting a signal with a signal error, the buffer index (e.g., RV) of the circular buffer is changed on the transmission side to transmit an encoded sequence different from the previously transmitted signal, and HARQ combining is performed on the reception side (in other words, when there is no signal error, retransmission is not performed and the RV of the circular buffer is not changed. This process may be repeated until there is no signal error. Even when retransmission is repeated and an encoded sequence with the same RV as the first transmission signal is transmitted again, the coding gain is improved by time diversity.

[0027] [Configuration of Wireless Communication System] A wireless communication system according to an embodiment of the present disclosure includes at least one access point (Access Point (AP), also referred to as a "base station") and one terminal (referred to as a Station (STA)). For example, in Down Link (DL) communication, the AP corresponds to a "downlink wireless transmission device" and the STA corresponds to a "downlink wireless reception device". Also, in Up Link (UL) communication, the AP corresponds to an "uplink wireless reception device" and the STA corresponds to an "uplink wireless transmission device".

[0028] In one embodiment of the present disclosure, for example, a data part (e.g., Data field) of a frame (e.g., PPDU) includes a plurality of subcarrier groups (or subchannels) to which signals generated from common (or identical) information bits are assigned. A communication mode including such a data part is called "generalized dup mode". Also, a PPDU in generalized dup mode is called, for example, "generalized dup mode PPDU".

[0029] Thus, in generalized dup mode, a plurality of modes may be set regarding the assignment of a common data signal to at least a plurality of subchannels arranged in the frequency domain.

[0030] For example, as one of generalized dup modes, there is a "HT / non-HT dup mode" which is a mode including a non-HT duplicate PPDU common to two or more subchannels.

[0031] Also, for example, as one of generalized dup modes, there is a "HE dup mode" which is a mode including a HE SU PPDU or a HE Extended Range (ER) PPDU of DCM.

[0032] Also, for example, as one of the generalized dup modes, there is an "EHT dup mode" which is a mode including a BPSK-DCM PPDU or a BPSK-DCM-DUP PPDU. Also, the EHT dup mode may include a plurality of modes (an example will be described later) in which the RV settings for a plurality of sub-channels are different.

[0033] For example, the AP may transmit a generalized dup mode PPDU to the STA together with control information regarding the generalized dup mode. The STA may, for example, identify (or also call it determination, discrimination) the generalized dup mode set for the STA based on the control information regarding the generalized dup mode, and perform reception processing for the generalized dup mode PPDU.

[0034] Hereinafter, as an example, a method for the AP to transmit a generalized dup mode PPDU to the STA in 11be will be described.

[0035] FIG. 6 is a sequence diagram showing an operation example related to the transmission of a generalized dup mode PPDU of the AP100 and the STA200 in a wireless communication system according to an embodiment of the present disclosure.

[0036] In FIG. 6, the STA200 transmits, for example, an association request signal including capability information (for example, called Capability) regarding the generalized dup mode of the STA200 to the AP100 (S101). The STA200 may make a connection request to the AP100 by transmitting the association request signal.

[0037] The AP100 transmits, for example, an association response signal to the STA200 in response to the association request signal from the STA200 (S102). The AP100 may, for example, permit the connection to the AP100 for the STA200 by transmitting the association response signal.

[0038] Note that the signal transmitted by STA200 to AP100 including the capability related to the generalized dup mode is not limited to the association request signal, and may be other signals such as, for example, a beacon signal, a probe response signal, or a re - association signal.

[0039] AP100 determines the generalized dup mode of the transmission signal to STA200 based on, for example, at least one of the capability of the STA200 obtained from the STA200 and the received signal strength (e.g., called Received Signal Strength Indicator (RSSI)) of the signal (e.g., association request signal) from the STA200, and allocates resources such as frequency resources (called Recourse Unit (RU)) or data sub - carriers for each sub - channel (S103).

[0040] Note that "allocation" may be mutually read as other terms such as "assignment" and "mapping" for a plurality of sub - channels.

[0041] Also, AP100 generates a generalized dup mode PPDU based on, for example, the resource information allocated for each sub - channel (S104), and transmits the generated generalized dup mode PPDU to STA200 (S105).

[0042] STA200 performs reception processing of a generalized dup mode PPDU transmitted from, for example, AP100 (S106). For example, STA200 may demodulate and decode data signals included in the generalized dup mode PPDU for each subchannel based on a channel estimation value obtained using a reference signal (e.g., Long Training Field (LTF)) included in the preamble part of the generalized dup mode PPDU and control information regarding the generalized dup mode included in the preamble part.

[0043] STA200 generates a response signal (referred to as Acknowledge (ACK)), for example, based on the reception processing result of the data signal, and transmits the ACK (e.g., information indicating whether there is an error or not) to AP100 (S107).

[0044] The operation examples regarding the transmission of the generalized dup mode PPDU of AP100 and STA200 have been described above.

[0045] FIG. 7 is a block diagram showing a partial configuration example of AP100 according to an embodiment of the present disclosure. In the AP100 shown in FIG. 7 (corresponding to a communication device, for example), a control unit (corresponding to a control circuit, for example) sets any one of a plurality of modes (e.g., generalized dup mode) regarding the allocation of a common data signal to a plurality of subchannels arranged at least in the frequency domain to STA200. A transmission unit (corresponding to a transmission circuit, for example) transmits information regarding the mode set to STA200 and signals allocated to the plurality of subchannels.

[0046] FIG. 8 is a block diagram showing a partial configuration example of the STA200 according to an embodiment of the present disclosure. In the STA200 shown in FIG. 8 (for example, corresponding to a communication device), a receiving unit (for example, corresponding to a receiving circuit) receives information regarding a mode set in the STA200 among a plurality of modes (for example, generalized dup mode) regarding the assignment of a common data signal to a plurality of subchannels arranged at least in a frequency domain. A control unit (for example, corresponding to a control circuit) controls the synthesis of signals assigned to the plurality of subchannels based on the information regarding the mode.

[0047] [Configuration example of AP100] FIG. 9 is a block diagram showing a configuration example of the AP100 (for example, a downlink wireless transmission device). The AP100 shown in FIG. 9 may include, for example, a wireless receiving unit 101, a received signal decoding unit 102, a resource allocation unit 103, a data generation unit 104, a data encoding unit 105, a data modulation unit 106, a preamble generation unit 107, and a wireless transmission unit 108.

[0048] Note that, for example, at least one of the received signal decoding unit 102, the resource allocation unit 103, the data generation unit 104, the data encoding unit 105, the data modulation unit 106, and the preamble generation unit 107 may be included in the control unit shown in FIG. 7, and the wireless transmission unit 108 may be included in the transmission unit shown in FIG. 7.

[0049] The wireless receiving unit 101 receives a signal transmitted from the STA200 (for example, a downlink wireless receiving device) via an antenna, and performs wireless receiving processes such as down-conversion and Analog-to-Digital (A / D) conversion on the received signal. The wireless receiving unit 101 divides, for example, the received signal after the wireless receiving process into a preamble part (also called a preamble signal) and a data part (also called a data signal), and outputs the received signal to the received signal decoding unit 102.

[0050] The received signal decoding unit 102 may perform demodulation processing such as Fourier transform (e.g., Fast Fourier Transform (FFT)) on the preamble signal and the data signal input from the wireless receiving unit 101, respectively, and extract the control signals included in the preamble signal and the data signal. The control signal may include, for example, a frequency bandwidth (BW), MCS, or a coding method.

[0051] Also, the received signal decoding unit 102 may perform channel equalization, demodulation, and decoding on the data signal after FFT using, for example, the control signal obtained from the preamble signal and the channel estimation signal, and perform error determination such as Cyclic Redundancy Check (CRC). For example, when there is no error (in other words, decoding error) in the data signal, the received signal decoding unit 102 outputs the decoded data signal and the control signal to the resource allocation unit 103. On the other hand, when there is an error in the data signal, the received signal decoding unit 102 may not output the decoded data signal.

[0052] The resource allocation unit 103 determines, for example, the generalized dup mode of the data signal to be transmitted to the STA 200 based on the reception quality information of the data signal input from the received signal decoding unit 102 (e.g., Packet Error Rate (PER) or RSSI, etc.) or the capability of the STA 200. Also, the resource allocation unit 103 allocates (or assigns, or maps) resources such as the number of sub-channels, the number of data sub-carriers, and the frequency resource (e.g., RU) to the sub-channels based on the determined generalized dup mode. The resource allocation unit 103 outputs information about the allocated resources (e.g., called resource allocation information) to the data generation unit 104, the data coding unit 105, the data modulation unit 106, and the preamble generation unit 107.

[0053] The data generation unit 104 generates, for example, a data sequence to be transmitted to the STA 200 based on the resource allocation information input from the resource allocation unit 103, and outputs the data sequence to the data encoding unit 105.

[0054] The data encoding unit 105 divides, for example, the data sequence input from the data generation unit 104 and the allocated data subcarriers for each subchannel based on the resource allocation information (e.g., the number of divisions of data subcarriers or data subcarrier information) input from the resource allocation unit 103. Then, the data encoding unit 105 performs encoding for each subchannel, for example, and outputs the encoded data to the data modulation unit 106.

[0055] The data modulation unit 106 performs modulation and inverse Fourier transform (e.g., Inverse Fast Fourier Transform (IFFT)) on the encoded data input from the data encoding unit 105 based on the resource allocation information (e.g., modulation mapping information) input from the resource allocation unit 103, and outputs the data signal to the wireless transmission unit 108.

[0056] The preamble generation unit 107 generates a preamble signal based on the resource allocation information input from the resource allocation unit 103, for example. The preamble signal may include, for example, control information regarding the generalized dup mode (e.g., the number of divisions of data subcarriers, that is, the number of subchannels (Number of Duplicate (N dup )) or the type of the generalized dup mode, etc.). For example, the preamble generation unit 107 performs modulation and IFFT processing on the preamble signal, and outputs the preamble signal to the wireless transmission unit 108.

[0057] The wireless transmission unit 108 generates a wireless frame (which may be referred to as, for example, a "packet signal" or "packet") that includes a data signal input from the data modulation unit 106 and a preamble signal input from the preamble generation unit 107. The wireless transmission unit 108 performs wireless transmission processing such as Digital-to-Analog (D / A) conversion and up-conversion to the carrier frequency on the generated wireless frame, and transmits the signal after the wireless transmission processing to the STA200 via the antenna.

[0058] <Configuration example of STA200> FIG. 9 is a block diagram showing a configuration example of the STA200 (for example, a downstream wireless reception device). The STA200 shown in FIG. 9 may include, for example, a wireless reception unit 201, a preamble demodulation unit 202, a data demodulation unit 203, a data synthesis unit 204, a data decoding unit 205, a transmission signal generation unit 206, and a wireless transmission unit 207.

[0059] Note that, for example, at least one of the preamble demodulation unit 202, the data demodulation unit 203, the data synthesis unit 204, the data decoding unit 205, and the transmission signal generation unit 206 may be included in the control unit shown in FIG. 8, and the wireless reception unit 201 may be included in the reception unit shown in FIG. 8.

[0060] The wireless reception unit 201 receives the signal transmitted from the AP100 via the antenna, and performs wireless reception processing such as down-conversion and A / D conversion on the received signal. The wireless reception unit 201 extracts the preamble from the signal after the wireless reception processing and outputs it to the preamble demodulation unit 202. Also, the wireless reception unit 201 extracts the data signal from the signal after the wireless reception processing and outputs it to the data demodulation unit 203.

[0061] The preamble demodulation unit 202 performs demodulation processing such as FFT on the preamble signal input from the wireless reception unit 201, and extracts, for example, control signals (such as BW, MCS, or coding method, etc.) used for demodulation and decoding of data signals from the demodulated preamble signal. The preamble demodulation unit 202 outputs, for example, the extracted control signals to the data demodulation unit 203 and the data decoding unit 205. Also, the preamble demodulation unit 202 performs channel estimation based on, for example, a reference signal (such as LTF) included in the preamble signal, and outputs the channel estimation information to the data demodulation unit 203. Further, the preamble demodulation unit 202 outputs, for example, control information (such as the number of subchannels or the type of generalized dup mode, etc.) regarding the generalized dup mode included in the preamble signal to the data synthesis unit 204.

[0062] The data demodulation unit 203 performs processing such as FFT, channel equalization, or demodulation on the data signal input from the wireless reception unit 201 based on, for example, the control information and channel estimation information input from the preamble demodulation unit 202, and outputs the demodulated data signal addressed to the STA 200 to the data synthesis unit 204.

[0063] The data synthesis unit 204 determines whether to synthesize the decoded data signal input from the data demodulation unit 203 based on the control information input from the preamble demodulation unit 202. For example, when the communication mode corresponding to the demodulated data signal is different from the generalized dup mode (in the case of non-generalized dup mode), the data synthesis unit 204 outputs the demodulated data signal input from the data demodulation unit 203 to the data decoding unit 205. On the other hand, for example, when the communication mode corresponding to the demodulated data signal is the generalized dup mode, the data synthesis unit 204 performs data synthesis based on the type of generalized dup mode, and outputs the synthesized data to the data decoding unit 205.

[0064] The data decoding unit 205 decodes the data signal input from the data synthesizing unit 204 based on, for example, the control information input from the preamble demodulating unit 202, performs error determination such as CRC, and outputs information indicating the error determination result to the transmission signal generation unit 206.

[0065] The transmission signal generation unit 206 generates a response signal (for example, ACK or Block ACK (BA)) based on the information indicating the error determination result input from the data decoding unit 205. Further, the transmission signal generation unit 206 adds a preamble signal to, for example, a data signal (for example, an uplink data signal) to generate a wireless frame (for example, a packet signal), and outputs it to the wireless transmission unit 207.

[0066] The wireless transmission unit 207 performs wireless transmission processing such as D / A conversion and up-conversion to the carrier frequency on the wireless frame input from the transmission signal generation unit 206, and transmits the signal after the wireless transmission processing to the AP100 via the antenna.

[0067] [Operation examples of AP100 and STA200] Next, operation examples of the AP100 and STA200 of the present embodiment will be described.

[0068] In one embodiment of the present disclosure, the plurality of generalized dup modes that can be set in the STA200 may include an EHT dup mode in which signals (for example, coded sequences) corresponding to any of the RVs of the error correction code for the data signal are included in a plurality of sub-channels.

[0069] For example, the EHT dup mode may include a mode in which individual RVs (for example, different RVs) are assigned to data sub-carriers (or sub-channels). In other words, the EHT dup mode may include a mode in which the RV of the sub-channel is changed.

[0070] In this mode, in an EHT dup mode PPDU, among the encoded sequence data stored in a cyclic buffer like HARQ-IR, different encoded sequences with different RVs may be assigned to a plurality of subchannels.

[0071] FIG. 11 is a diagram showing an example of an EHT dup mode PPDU format including encoded sequences with different RVs for each subchannel. In the example shown in FIG. 11, a plurality of data subcarriers are divided into two subchannels, RV = 0 is assigned to one subchannel, and RV = 1 is assigned to the other subchannel. By assigning different RVs for each subchannel, at the receiving side (e.g., STA200), an encoding gain by HARQ combining can be obtained, and for example, the coverage can be improved.

[0072] Note that, for example, the coding rate that can be used in 11be's BPSK-DCM and BPSK-DCM-DUP is 1 / 2. In this case, since the ratio of parity bits to data bits is small, it is difficult to transmit different parity bits for each RV, and thus it is difficult to obtain an encoding gain by HARQ combining.

[0073] Therefore, in one embodiment of the present disclosure, for example, in the above-described EHT dup mode, a coding rate smaller than 1 / 2 (e.g., coding rate = 1 / 3 or 1 / 4) may be set. Hereinafter, as an example of an error correction code, a configuration example of RV in the case of using Binary Convolutional Code (BCC) and Low-Density Parity-Check (LDPC) will be described.

[0074] <Configuration example of BCC> When using BCC, for example, AP100 may use an encoder with a coding rate of 1 / 2 to achieve a coding rate smaller than 1 / 2.

[0075] For example, AP100 may achieve a coding rate of 1 / 4 by encoding a data sequence twice with an encoder having a coding rate of 1 / 2.

[0076] Also, for example, AP100 may puncture the encoded data bits with an encoding rate of 1 / 4 generated by two encodings to achieve an encoding rate of 1 / 3. At this time, AP100 may change the puncturing pattern of the encoded data bits for each RV, for example. By changing the puncturing pattern, different parity bits are more likely to be transmitted, so that an encoding gain by HARQ combining can be obtained.

[0077] <Example Configuration 1 of LDPC> In Example Configuration 1 of LDPC, for example, in the case of a mode in which encoded sequences of different RVs are included in each subchannel (also referred to as "in the case of having IR" for example), the target (or target) encoding rate is realized by setting (in other words, changing) the codeword (referred to as Codeword (CW) for example) length.

[0078] FIG. 12 is a diagram showing an example in the case where the target encoding rate is 1 / 3.

[0079] In LDPC, the information bits are a bit sequence including, for example, data bits and shortened bits.

[0080] For example, as shown in FIG. 12, based on the information bit length of 972 bits with an encoding rate of 1 / 2, the cyclic buffer generated in the case where the target encoding rate is 1 / 3 is composed of information bits (for example, 972 bits) and parity bits 1 and 2 (for example, 972 bits each). As shown in FIG. 12, the CW length with an encoding rate of 1 / 2 (for example, in the case of no IR) is 1944 bits, while the CW length with an encoding rate of 1 / 3 (for example, in the case of having IR) is 2916 bits.

[0081] For example, as shown in FIG. 13, when the specified CW length = 1944 bits is used as the transmission unit, AP100 may transmit, including RV = 0 (e.g., information bits and parity bit 1) on subchannel 1 and including RV = 1 (e.g., information bits and parity bit 2) on subchannel 2. In this case, since common information bits are transmitted on multiple subchannels, the gain by DCM can be obtained. Also, since different RVs are transmitted on multiple subchannels, the gain by HARQ combining can be obtained.

[0082] Similarly, for example, based on the information bit length = 972 bits with a coding rate = 1 / 2, the cyclic buffer generated when the target coding rate = 1 / 4 is composed of information bits (e.g., 972 bits) and parity bits 1, 2, 3 (e.g., 972 bits each). In this case, for example, while the CW length with a coding rate = 1 / 2 (e.g., in the case of no IR) is 1944 bits, the CW length with a coding rate = 1 / 4 (e.g., in the case of having IR) is 3888 bits. At this time, for example, as shown in FIG. 14, when the specified CW length = 1944 bits is used as the transmission unit, AP100 may transmit, including RV = 0 (e.g., information bits and parity 1) on subchannel 1 and including RV = 1 (e.g., parity 2 and parity 3) on subchannel 2. In this case, since different RVs are transmitted on multiple subchannels, the gain by HARQ combining can be obtained.

[0083] <Example Configuration 2 of LDPC> In Example Configuration 2 of LDPC, for example, in the case of the mode where each subchannel includes coded sequences with different RVs (in the case of having IR), the target coding rate is achieved by setting (in other words, changing) the information bit length.

[0084] FIG. 15 is a diagram showing an example when the target coding rate is 1 / 3.

[0085] For example, as shown in FIG. 15, based on the information bit length of 972 bits with a coding rate of 1 / 2, the cyclic buffer generated when the target coding rate is 1 / 3 is composed of information bits (e.g., 648 bits) and parity bits 1 and 2 (e.g., 648 bits each). As shown in FIG. 15, while the information bit length with a coding rate of 1 / 2 (e.g., in the case of no IR) is 972 bits, the information bit length with a coding rate of 1 / 3 (e.g., in the case of having IR) is 648 bits.

[0086] In the second configuration example of LDPC, as shown in FIG. 15, the CW length is the same whether there is IR or not.

[0087] For example, as shown in FIG. 16, when using a specified CW length (e.g., 1296 bits) as a transmission unit, the AP100 may transmit including RV = 0 (e.g., information bits and parity bit 1) in subchannel 1 and including RV = 1 (e.g., information bits and parity bit 2) in subchannel 2. In this case, since common information bits are transmitted in a plurality of channels, a gain by DCM can be obtained. Also, since different RVs are transmitted in a plurality of subchannels, a gain by HARQ combining can be obtained.

[0088] Similarly, for example, based on an information bit length of 972 bits with a coding rate of 1 / 2, the cyclic buffer generated when the target coding rate is 1 / 4 is composed of information bits (e.g., 486 bits) and parity bits 1, 2, and 3 (e.g., 486 bits each). At this time, for example, as shown in FIG. 17, when the specified CW length (1296 bits) is used as the transmission unit, AP100 may include RV = 0 (e.g., information bits and parity bits 1 and 2) in subchannel 1 and RV = 1 (e.g., information bits and parity bits 1 and 3) in subchannel 2 for transmission. In this case, since common information bits are transmitted in a plurality of subchannels, a gain due to DCM can be obtained. Also, since different RVs are transmitted in a plurality of subchannels, a gain due to HARQ combining can be obtained.

[0089] <Example Configuration 3 of LDPC> In Example Configuration 3 of LDPC, for example, in the case of a mode in which coding sequences with different RVs are included in each subchannel, the target coding rate is realized by setting (in other words, changing) the data bit length.

[0090] FIG. 18 is a diagram showing an example of setting the data bit length.

[0091] As shown in FIG. 18, the substantial data bits included in the information bits may be reduced using dummy data bits. For example, all bits of the dummy data bits may be 0.

[0092] For example, when the CW length = 1944 bits, the cyclic buffer obtained by the generating polynomial with a coding rate = 1 / 2 is composed of information bits = 972 bits and parity bits = 972 bits. Therefore, for example, when the target coding rate is 1 / 4, the data bits included in the information bits may be set to 324 bits. For example, when the target coding rate is 1 / 4, the cyclic buffer obtained by the generating polynomial with a coding rate = 1 / 2 may be composed of information bits (for example, 972 bits (data bits (324 bits) + dummy data bits (648 bits)) and parity bits 1, 2, 3 (for example, 324 bits each). Note that the dummy data bits may not be included in the coded sequence for each RV included in the subchannel.

[0093] In this way, in Configuration Example 3 of LDPC, by changing the data bit length in the information bits with IR to the data bit length in the information bits with IR with respect to the data bit length in the information bits without IR, the target coding rate is achieved.

[0094] For example, as shown in FIG. 19, when the specified CW length = 648 bits is used as the transmission unit, the AP100 may include RV = 0 (for example, information bits and parity bit 1) in subchannel 1 and include RV = 1 (for example, parity bits 2, 3) in subchannel 2 and transmit them. In this case, since different RVs are transmitted in a plurality of subchannels, a gain due to HARQ combining can be obtained.

[0095] The configuration example of RV has been described above.

[0096] Next, examples of modes (for example, Examples 1 to 3) in which coded sequences of different RVs are included in each subchannel will be described.

[0097] <Example 1> The EHT dup mode may include, for example, modulation mapping for signals (e.g., coded sequences) assigned to two or more subchannels, and a mode in which both the RVs are different (hereinafter referred to as "EHT dup mode (DCM+IR)"). In other words, the EHT dup mode may include a mode in which the DCM of BPSK-DCM or BPSK-DCM-DUP is changed to DCM and IR (e.g., DCM+IR).

[0098] In the EHT dup mode (DCM+IR), for example, different modulation mappings are performed on coded sequences that are at least partially common in a plurality of subchannels. Also, in the EHT dup mode (DCM+IR), for example, coded sequences with different RVs are included in a plurality of subchannels.

[0099] FIG. 20 is a diagram showing an example of an EHT-SIG including control information of the EHT dup mode (DCM+IR) in Example 1.

[0100] As shown in FIG. 20, the AP100 may notify the STA200 of control information regarding the EHT dup mode (DCM+IR), for example. The control information regarding the EHT dup mode (DCM+IR) may include, for example, the number of divisions of data subcarriers (e.g., the number of subchannels (Number of Duplicate (N dup ))), information indicating the type of generalized dup mode (here, EHT dup mode (DCM+IR)) (e.g., generalized DUP mode), and information indicating the RV for each subchannel.

[0101] Note that in FIG. 20, as an example, the number of subchannels N dupThis shows the case where it is included in a common field common to multiple users (STAs), and the generalized dup mode and RV are included in a user-specific field specific to the user (STA). However, the fields containing each control information are not limited to these, and may be included in at least one of the common field and the user-specific field, or in other fields.

[0102] In the example shown in FIG. 20, at least a part of the encoded sequence with RV = 0 included in subchannel 1 and the encoded sequence with RV = 2 included in subchannel 2 is common. For example, in subchannel 1 and subchannel 2, the encoded data bits may be common and the parity bits may be different.

[0103] By the EHT dup mode (DCM + IR), for example, a frequency diversity gain by transmitting data that is at least partially common for each subchannel with different modulation mappings, and an encoding gain by HARQ combining (transmission of different RVs for each subchannel) can be obtained.

[0104] <Example 2> The EHT dup mode may include, for example, a mode in which the RVs in two or more subchannels are different (hereinafter referred to as "EHT dup mode (IR)"). In other words, the EHT dup mode may include a mode in which the DCM of BPSK-DCM or BPSK-DCM-DUP is changed to IR.

[0105] In the EHT dup mode (IR), for example, encoded sequences with different RVs are included in a plurality of subchannels. Also, in the EHT dup mode (IR), for example, different modulation mappings may not be performed in a plurality of subchannels.

[0106] FIG. 21 is a diagram showing an example of an EHT-SIG including the control information of the EHT dup mode (IR) in Example 2.

[0107] As shown in FIG. 21, for example, the AP100 may notify the STA200 of control information regarding the EHT dup mode (IR). The control information regarding the EHT dup mode (IR) may include, for example, the number of subchannels N dup , information indicating the type of generalized dup mode (here, EHT dup mode (IR)) (generalized DUP mode), and information indicating the RV for each subchannel.

[0108] Note that in FIG. 21, as an example, the number of subchannels N dup is included in the common field, and the case where the generalized dup mode and RV are included in the User specific field is shown. However, the field in which each control information is included is not limited to these, and may be included in at least one of the common field and the User specific field, or in another field.

[0109] In the example shown in FIG. 21, the encoded sequence with RV = 0 included in subchannel 1 and the encoded sequence with RV = 1 included in subchannel 2 are different from each other.

[0110] By the EHT dup mode (IR), for example, a frequency diversity gain by transmitting the RV of the encoded sequence data for each subchannel and an encoding gain by HARQ combining can be obtained.

[0111] <Example 3> The EHT dup mode may include, for example, a mode (hereinafter referred to as "EHT dup mode (Time dup)") in which two or more subchannels to which signals with different RVs (for example, encoded sequences) are assigned are included in the time domain (or also referred to as the time direction).

[0112] In the EHT dup mode (Time dup), for example, among a plurality of sub-channels arranged in the frequency domain (or also referred to as the frequency direction) and the time domain, the RVs between the sub-channels in at least the time domain may be different. For example, in the EHT dup mode (Time dup), the coded sequences of different RVs may be included in a plurality of different sub-channels in the frequency domain and the time domain respectively.

[0113] FIG. 22 is a diagram showing an example of the frame format (e.g., PPDU format) of the EHT dup mode (Time dup). Further, FIG. 23 is a diagram showing an example of the EHT-SIG including the control information of the EHT dup mode (Time dup).

[0114] As shown in FIG. 23, the AP100 may, for example, notify the STA200 of the control information regarding the EHT dup mode (Time dup). The information regarding the EHT dup mode (Time dup) may include, for example, the number of sub-channels N dup , information indicating the type of the generalized dup mode (here, EHT dup mode (IR)) (generalized DUP mode), and information indicating the RV for each sub-channel.

[0115] Note that in FIG. 23, as an example, the case where the number of sub-channels N dup is included in the common field and the generalized dup mode and RV are included in the User specific field is shown, but the field in which each control information is included is not limited to these, and may be included in at least one of the common field and the User specific field, or in other fields.

[0116] Also, in EHT dup mode (Time dup), for example, as shown in FIG. 22, the RV may be changed for each MAC Service Data Unit (MPDU). The STA200 may, for example, refer to the MAC header of each MPDU included in the received signal, and when a common sequence number is included, identify that the RV included in the MPDU corresponding to the MAC header is an encoded sequence of RVs that refer to a common (e.g., the same) cyclic buffer.

[0117] Also, for example, a part of the encoded sequence (e.g., an MPDU or CW that is a retransmission unit of HARQ) may be included in different subchannels in the time domain, and the remaining part of the encoded sequence may be included in a common subchannel in the time domain (e.g., different subchannels in the frequency domain).

[0118] In EHT dup mode (Time dup), in addition to the frequency domain, encoded sequences of different RVs are transmitted in the time domain as well. Therefore, the number of transmissible encoded sequences used for HARQ combining can be increased, and the coding gain can be improved.

[0119] Note that for the frequency domain in Example 3, for example, the example of the allocation of the encoded sequence of RVs in Example 1 or Example 2 may be applied.

[0120] Above, examples of modes in which encoded sequences of different RVs are included in each subchannel have been described.

[0121] Note that the method of notifying control information regarding generalized dup mode is not limited to the example of notification by ETH-SIG in any of Examples 1 to 3 described above. Hereinafter, other examples of the method of notifying control information regarding generalized dup mode will be described.

[0122] <Method 1> In Method 1, a part of the user information (e.g., information in the User specific field) is reinterpreted as control information regarding generalized dup mode.

[0123] FIG. 24 is a diagram showing an example of ETH-SIG in Method 1.

[0124] For example, in 11be's BPSK-DCM and BPSK-DCM-DUP, the number of spatial streams is set (in other words, restricted) to 1. Therefore, for example, in BPSK-DCM and BPSK-DCM-DUP, since the number of spatial streams is fixedly set to STA200, control information regarding the number of spatial streams may not be notified to STA200. Thus, as shown in FIG. 24, based on the type of generalized dup mode (for example, DCM+IR, IR, or Time dup), a part of the user information may be rewritten as control information regarding the generalized dup mode.

[0125] For example, as shown in FIG. 24, in the EHT dup mode, AP100 and STA200 rewrite the Number of Space-Time Streams subfield (N sts )(for example, 4 bits) included in the User specific field of the EHT-SIG into the number of subchannels N dup (for example, 2 bits) and the RV (for example, 2 bits) of some subchannels (for example, subchannel 1).

[0126] Also, for example, as shown in FIG. 24, in the EHT dup mode, AP100 and STA200 may rewrite the Reserved subfield of the EHT-SIG into a retransmission identifier (referred to as New Data Indicator (NDI)) (for example, 1 bit). In other words, STA200 may receive information regarding the generalized dup mode in at least a part of the field of the User specific field (terminal-specific control field) that is different from the information regarding the generalized dup mode (in FIG. 24, N sts or the Reserved field).

[0127] For example, in FIG. 24, when the EHT dup mode is notified by the generalized dup mode, the STA 200 uses the RV of subchannel 1 and the number of subchannels N sts included in the field, and the retransmission identifier NDI included in the Reserved field, and the length of the circular buffer obtained by the decoding process, to determine the combination of RVs of each subchannel. dup

[0128] For example, as shown in FIG. 25, the STA 200 determines the combination of RVs of each subchannel based on the notification information from the AP 100, such as the control information regarding the generalized dup mode and the length of the circular buffer. For example, in FIG. 25, the STA 200 may identify the RVs of subchannels 2 to 4 different from subchannel 1 based on the notification information. In FIG. 25, L represents the circular buffer length, and N rv indicates the number of RVs included in the circular buffer.

[0129] By Method 1, the AP 100 can notify the STA 200 of the control information regarding the generalized dup mode without additional signaling, thus suppressing an increase in signaling overhead.

[0130] Note that in FIG. 24, an example has been described where the N sts field includes the RV and the number of subchannels N dup and the Reserved field includes NDI. However, the control information regarding the generalized dup mode included in the N sts field and the Reserved field is not limited to this. Also, the field for notifying the control information regarding the generalized dup mode is not limited to the N sts field and the Reserved field, and other fields may also be used.

[0131] <Method 2> ​In Method 2, in combination with the MCS, control information regarding the generalized dup mode is notified to STA200.

[0132] FIG. 26 is a diagram showing an example of information indicating the association between the MCS index (e.g., EHT MCS index) according to Method 2 and a combination with control information (including control information regarding the generalized dup mode). In FIG. 26, for example, an example of representing the association in a table format (MCS Table) is shown.

[0133] The MCS Table shown in FIG. 26 may include, for example, as candidates for modulation, types of generalized dup mode (Modulation), coding rates, the number of subchannels (N dup )), and control information of the generalized dup mode such as a combination pattern of RVs for each subchannel. Note that the MCS Table may include, as candidates for modulation, candidates for modulation schemes such as BPSK, Quadrature Phase Shift Keying (QPSK), 16 - Quadrature Amplitude Modulation (QAM), 64 - QAM, 256 - QAM, 1024 - QAM, or 4096 - QAM (not shown). In other words, each of a plurality of candidates including a modulation scheme for a data signal and a plurality of generalized dup modes (e.g., BPSK - DCM, BPSK - DCM - DUP) may be associated with an MCS index (identification information).

[0134] Note that the MCS index associated with the generalized dup mode may be any value (represented by To be determined (TBD) in FIG. 26). For example, using a 4-bit MCS index similar to 11ax, some of MCS12 to MCS15 that are unused in 11ax may be used to indicate each mode of the generalized dup mode, or the MCS index may be extended to 5 bits or more and each mode of the generalized dup mode may be indicated by an index of MCS16 or higher. Also, the generalized dup mode included in the MCS Table is not limited to the example shown in FIG. 26, and other generalized dup modes may be included, or other combinations of generalized dup modes may be used.

[0135] For example, STA200 may receive the MCS index notified from AP100, and based on the received MCS index, refer to the MCS Table shown in FIG. 26 to determine the type of the generalized dup mode, the number N dup of sub-channels, and the RV of each sub-channel.

[0136] By Method 2, AP100 can notify STA200 of the control information regarding the generalized dup mode by means of the MCS table even when the number of spatial streams of the DCM is not set to 1. Therefore, since AP100 can notify STA200 of the control information regarding the generalized dup mode without additional signaling, an increase in signaling overhead can be suppressed.

[0137] The example of the method for notifying the control information regarding the generalized dup mode has been described above.

[0138] Thus, in this embodiment, STA200 receives control information regarding the generalized dup mode set for STA200 among a plurality of generalized dup modes, and controls the synthesis of signals assigned to a plurality of subchannels based on the received information regarding the generalized dup mode.

[0139] By this control, STA200 can communicate by switching an expected coverage extension method (e.g., generalized dup mode) according to a communication situation such as a communication frequency band. Also, in the generalized dup mode, STA200 can set individual RVs for subchannels, and improve the coverage by the frequency diversity gain or coding gain by the generalized dup mode. Thereby, for example, even in a frequency band where an LPI terminal in the 6 GHz band, whose coverage tends to be narrower compared to a terminal in the 5 GHz band, can be used (or a frequency band where the transmit power density can be limited), the same coverage extension as in the 5 GHz band can be realized.

[0140] Therefore, according to this embodiment, the communication quality in wireless communication can be improved.

[0141] The above describes each embodiment of the present disclosure.

[0142] (Other Embodiments) (1) For example, in 11be, DCM is set (in other words, limited) for an SU, but the generalized dup mode according to an embodiment of the present disclosure is not limited to an SU, and may be applied to, for example, multi-user transmission (Multi-User Multiple-Input Multiple-Output (MU-MIMO) or Orthogonal Frequency-Division Multiple Accuses (OFDMA)).

[0143] (2) The modulation method, coding rate, and number of spatial streams used in the above-described embodiments are examples and are not limited, and other values may be set.

[0144] (3) The retransmission unit in the above-described embodiments may be either an MPDU or a CW, or other transmission units.

[0145] (4) In the above-described embodiments, a method for notifying the RV for each subchannel has been described. However, for example, the RV included in the generalized dup mode PPDU of the first transmission (for example, when NDI = 0) may be fixed for each subchannel.

[0146] For example, the generalized dup mode PPDU of the first transmission may fixedly include a coded sequence with RV = 0 for subcarrier 1 and RV = 1 for subcarrier 2. Therefore, for example, the generalized dup mode PPDU of the first transmission may not include control information regarding the RV for each subchannel. Thereby, signaling regarding the RV can be reduced, and thus the overhead can be improved.

[0147] (5) In the above-described embodiments, for example, a Midamble may be included in the data part. By using the Midamble, for example, it is possible to adapt to a high-speed fading environment.

[0148] FIG. 27 is a diagram showing an example of a frame format (for example, PPDU format) when including a Midamble (for example, EHT-LTF). The AP100 may notify the STA200 whether the Midamble is included in the data part in the Doppler field included in the preamble part, similar to 11ax for example.

[0149] Also, the AP100 may change the RV of the data part, for example, before and after the Midamble.

[0150] Also, for example, when Doppler field = 1 included in the preamble part of the received signal, STA200 may read at least a part of N included in the User specific field of EHT-SIG into the period of Midamble. For example, similar to 11ax, STA200 sts may read the least significant bit of N into the period of Midamble (referred to as Midamble periodicity). For example, STA200 sts may read the least significant bit of N. For example, when the least significant bit of N sts = 0, it may be read as Midamble periodicity = 10 data symbols, and when the least significant bit of N sts = 1, it may be read as Midamble periodicity = 20 data symbols.

[0151] STA200 can obtain a channel estimation value following fast fading fluctuations, for example, by using a reference signal (e.g., LTF) included in Midamble.

[0152] Also, for example, in <Example 3> described above, a midamble may be included between sub-channels in different time regions of RV. In this case, AP100 may notify the presence or absence of Midamble by, for example, the Doppler field. Also, in this case, STA200 sts does not have to read a part of N into the period of Midamble.

[0153] (6) In the above-described embodiments, the size of the RU to which the transmission signal is assigned is not limited. Also, for example, a plurality of RUs may be assigned to one STA200 (referred to as, for example, "Multi-RU").

[0154] FIG. 28 is a diagram showing an example of the generalized dup mode PPDU format when using an RU larger than 80 MHz. FIG. 29 is a diagram showing an example of the generalized dup mode PPDU format when using Multi-RU.

[0155] In these cases, STA200 performs reception processing of an 80MHz segment including, for example, a primary channel. STA200 identifies the size of the RU assigned to STA200 based on the values of the BW field and the Puncturing information field included in the preamble part.

[0156] For example, as shown in FIG. 28, when the RU assigned to STA200 is larger than 80MHz, STA200 performs reception processing of other 80MHz segments not including the primary channel, and may perform HARQ combining of the coded sequences for each subchannel included in the plurality of RUs assigned to STA200.

[0157] Also, for example, as shown in FIG. 29, when Multi-RU is assigned to STA200, STA200 may derive the number of data subcarriers included in each subchannel by dividing the data subcarriers included in Multi-RU by the number of subchannels and perform HARQ combining.

[0158] (7) An embodiment of the present disclosure may be applied to Multi-AP operation. FIGS. 30 and 31 are diagrams showing examples of Multi-AP operation.

[0159] For example, as shown in FIG. 30, two or more APs 100 (AP1 and AP2 in FIG. 30) may simultaneously transmit a common generalized dup mode PPDU (including RV = 0, 2 in FIG. 30) to STA200 (for example, referred to as Joint Transmission (JT)). Thereby, in addition to the coding gain by HARQ combining, a beamforming gain by JT can be obtained.

[0160] Also, for example, as shown in FIG. 31, two or more APs 100 (AP1 and AP2 in FIG. 31) may simultaneously transmit a generalized dup mode PPDU including different RV coding sequences to the STA 200 (for example, referred to as Distributed MIMO). Thereby, the coding gain can be improved by increasing the coding sequences used for HARQ combining.

[0161] (8) In the above embodiment, in the case of the generalized dup mode that performs DCM without performing IR, the patterns of the BCC interleaver and the LDPC tone mapper may be changed for each subchannel.

[0162] For example, a field for notifying the switching of the patterns of the BCC interleaver and the LDPC tone mapper for each subchannel may be added to the preamble part (for example, EHT-SIG).

[0163] (9) In the above embodiment, a STA 200 that does not support the DCM function (or a STA 200 that does not enable the DCM function) may receive the DCM signal on the primary channel, for example.

[0164] As an example, for STA 1 that supports DCM and STA 2 that does not support DCM, the AP 100 may transmit spatially multiplexed data. FIG. 32 is a diagram showing an example of the PPDU format of the MU DCM signal in this case.

[0165] The AP 100 may transmit, for example, a signal to which DCM is applied to the data of both STA 1 and STA 2. Since STA 1 supports DCM, for example, it can receive the signal transmitted from the AP 100 on each subchannel, extract and combine the signal destined for STA 1, and obtain the frequency diversity gain by DCM. Also, since STA 2 does not support DCM, for example, it receives the signal transmitted from the AP 100 on the primary channel, extracts the signal destined for STA 2, and performs decoding.

[0166] (10) In the above embodiment, as an example, a configuration example based on the 11ax frame format has been described. However, the format to which an embodiment of the present disclosure is applied is not limited to the 11ax format.

[0167] (11) In the above embodiment, the operation in DL communication has been described. However, an embodiment of the present disclosure is not limited to DL communication, and may be applied to, for example, UL communication or sidelink.

[0168] (12) The present disclosure can be realized by software, hardware, or software in cooperation with hardware. Each functional block used in the description of the above embodiment may be realized as an LSI which is an integrated circuit, partially or entirely, and each process described in the above embodiment may be controlled partially or entirely by one LSI or a combination of LSIs. The LSI may be composed of individual chips, or may be composed of one chip so as to include a part or all of the functional blocks. The LSI may be provided with data input and output. Depending on the degree of integration, the LSI may also be referred to as an IC, a system LSI, a super LSI, or an ultra LSI.

[0169] The method of integrating into an integrated circuit is not limited to LSI, and may be realized by a dedicated circuit, a general-purpose processor, or a dedicated processor. Also, after manufacturing the LSI, an FPGA (Field Programmable Gate Array) that can be programmed, or a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used. The present disclosure may be realized as digital processing or analog processing.

[0170] Furthermore, if an integrated circuit technology that replaces the LSI appears due to the progress of semiconductor technology or another derived technology, naturally, the technology may be used to integrate the functional blocks. The application of biotechnology and the like are possible as examples.

[0171] The present disclosure can be implemented in any type of device, apparatus, system having a communication function (collectively referred to as a communication device). The communication device may include a wireless transceiver (transceiver) and a processing / control circuit. The wireless transceiver may include a receiving unit and a transmitting unit, or may include them as functions. The wireless transceiver (transmitting unit, receiving unit) may include an RF (Radio Frequency) module and one or more antennas. The RF module may include an amplifier, an RF modulator / demodulator, or the like. Non-limiting examples of the communication device include a telephone (mobile phone, smartphone, etc.), a tablet, a personal computer (PC) (laptop, desktop, notebook, etc.), a camera (digital still / video camera, etc.), a digital player (digital audio / video player, etc.), a wearable device (wearable camera, smartwatch, tracking device, etc.), a game console, a digital book reader, a telehealth / telemedicine (remote healthcare / medical prescription) device, a vehicle or mobile transportation means with a communication function (automobile, airplane, ship, etc.), and combinations of the various devices described above.

[0172] The communication device is not limited to being portable or movable, and includes any type of device, apparatus, system that is not portable or is fixed, such as a smart home device (home appliance, lighting device, smart meter or measuring device, control panel, etc.), a vending machine, and any other "thing" that can exist on the IoT (Internet of Things) network.

[0173] Communication includes data communication by a cellular system, a wireless LAN system, a communication satellite system, etc., and also includes data communication by combinations thereof.

[0174] In addition, the communication device also includes devices such as a controller and a sensor that are connected or coupled to a communication device that executes the communication function described in the present disclosure. For example, a controller and a sensor that generate control signals and data signals used by the communication device that executes the communication function of the communication device are included.

[0175] In addition, the communication device includes infrastructure facilities, such as base stations, access points, and any other devices, devices, and systems that communicate with or control the above-mentioned various non-limiting devices.

[0176] A communication device according to an embodiment of the present disclosure includes a receiving circuit that receives information regarding at least one of a plurality of modes related to the allocation of a common data signal to a plurality of sub-carrier groups, and a control circuit that controls the synthesis of signals allocated to the plurality of sub-carrier groups based on the information regarding the mode.

[0177] In an embodiment of the present disclosure, the plurality of modes include a first mode, and the first mode indicates that a signal corresponding to any of the redundancy versions (RVs) of the error correction code for the data signal is included in the plurality of sub-carrier groups.

[0178] In an embodiment of the present disclosure, in the first mode, both the RV and the modulation mapping are different among the plurality of sub-carrier groups.

[0179] In an embodiment of the present disclosure, in the first mode, the RV is different among the plurality of sub-carrier groups.

[0180] In an embodiment of the present disclosure, in the first mode, the RVs are different among the sub-carrier groups arranged in the time domain.

[0181] In one embodiment of the present disclosure, the receiving circuit receives the information regarding the mode in at least a part of a field of information different from the information regarding the mode among the control fields for each terminal.

[0182] In one embodiment of the present disclosure, each of a plurality of candidates including a modulation method for the data signal and the plurality of modes is associated with identification information, and the receiving circuit receives the identification information associated with any one of the plurality of candidates.

[0183] A communication device according to one embodiment of the present disclosure includes a control circuit that sets at least one of a plurality of modes regarding allocation of a common data signal to a plurality of sub-carrier groups, and a transmission circuit that transmits information regarding the mode and signals allocated to the plurality of sub-carrier groups.

[0184] In a communication method according to one embodiment of the present disclosure, a communication device receives information regarding at least one of a plurality of modes regarding allocation of a common data signal to a plurality of sub-carrier groups, and controls synthesis of signals allocated to the plurality of sub-carrier groups based on the information regarding the mode.

[0185] In a communication method according to one embodiment of the present disclosure, a communication device sets at least one of a plurality of modes regarding allocation of a common data signal to a plurality of sub-carrier groups, and transmits information regarding the mode and signals allocated to the plurality of sub-carrier groups.

[0186] The disclosure contents of the specification, drawings, and abstract included in Japanese Patent Application No. 2020-185778 filed on November 6, 2020 are all incorporated herein by reference.

Industrial Applicability

[0187] One embodiment of the present disclosure is useful for a wireless communication system.

Explanation of Signs

[0188] 100 AP 101,201 Wireless reception unit 102 Received signal decoding unit 103 Resource allocation unit 104 Data generation unit 105 Data encoding unit 106 Data modulation unit 107 Preamble generation unit 108,207 Wireless transmission unit 200 STA 202 Preamble demodulation unit 203 Data demodulation unit 204 Data synthesis unit 205 Data decoding unit 206 Transmission signal generation unit

Claims

1. A receiving circuit that receives information regarding at least one of a plurality of modes related to the assignment to a plurality of sub-carrier groups of a first data signal and a second data signal generated from common information bits; A control circuit that controls the combination of the first data signal and the second data signal assigned to the plurality of sub-carrier groups based on the information regarding at least one of the plurality of modes; comprising: The transmission start positions of the coded sequences are different among the plurality of sub-carrier groups; A communication device.

2. The plurality of modes include a first mode, and in the first mode, a signal corresponding to any one of the redundancy versions (RV) of the error correction code for the first data signal and the second data signal is included in the plurality of sub-carrier groups; The communication device according to claim 1.

3. In the first mode, both the RV and the modulation mapping are different among the plurality of sub-carrier groups; The communication device according to claim 2.

4. In the first mode, the RV is different among the plurality of sub-carrier groups; The communication device according to claim 3.

5. In the first mode, the RV is different among the sub-carrier groups arranged in the time domain; The communication device according to claim 3.

6. The receiving circuit receives a terminal-specific control field, The terminal-specific control field includes a first field that includes the information regarding at least one of the plurality of modes, and a second field that is different from the first field; The receiving circuit receives the information regarding at least one of the plurality of modes in at least a part of the second field. The communication device according to claim 2.

7. Each of a plurality of candidates including a modulation method for the first data signal and the second data signal and the plurality of modes is associated with identification information. The receiving circuit receives the identification information associated with any one of the plurality of candidates. The communication device according to claim 2.

8. A communication device receives information regarding at least one of a plurality of modes regarding an assignment to a plurality of sub-carrier groups of a first data signal and a second data signal generated from common information bits, and controls a combination of the first data signal and the second data signal assigned to the plurality of sub-carrier groups based on the information regarding at least one of the plurality of modes. A communication method.

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