Communication device, communication method, and integrated circuit

Abstract

To extend coverage in wireless communication.SOLUTION: A communication device includes a receiving circuit that receives a physical layer convergence procedure protocol data unit (PPDU) including a first data signal and a second data signal generated from common information bits and a signaling field that includes information indicating at least one of a plurality of modes for allocating the first data signal and the second data signal to a plurality of subcarrier groups, and a control circuit that processes the first data signal and the second data signal allocated to the plurality of subcarrier groups based on the information.SELECTED DRAWING: Figure 10

Description

[Technical Field]

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

[0002] The IEEE Task Group (TG) be is currently developing the technical specifications for 802.11be (hereinafter referred to as "11be") as the successor standard to the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, 802.11ax (hereinafter referred to as "11ax"). [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] IEEE P802.11ax D7.0, September 2019 [Non-patent document 2] IEEE 802.11-20 / 986r1, DCM for range extension in 6GHz LPI, March 2020 [Non-patent document 3] IEEE 802.11-20 / 965r4, 6GHz LPI Range Extension, August 2020 [Non-patent document 4] IEEE Std 802.11, 2016 [Non-Patent Document 5] IEEE 802.11-19 / 780r0, Consideration on HARQ, May 2019 Summary of the Invention [Problem to be solved by the invention]

[0004] However, there is room for further study on how to extend the coverage of wireless communications.

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

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

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

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

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

[0010] [Figure 1] An example of the Dual Carrier Modulation High Efficient Single User Physical Layer Convergence Procedure Protocol Data Unit (DCM HE SU PPDU) format [Figure 2]A diagram showing an example of Binary Phase-Shift Keying (BPSK)-DCM and BPSK-DCM-DUP PPDU format. [Figure 3] An example of the BPSK-DCM-DUP PPDU format [Figure 4] An example of a non-High Throughput (HT) PPDU format [Figure 5] An example of a circular buffer [Figure 6] Sequence diagram showing an example of the operation of an Access Point (AP) and a Station (STA) [Figure 7] FIG. 1 is a block diagram showing a configuration example of a part of an AP according to a first embodiment; [Figure 8] FIG. 1 is a block diagram showing a configuration example of a part of an STA according to a first embodiment; [Figure 9] FIG. 1 is a block diagram showing an example of the configuration of an AP according to a first embodiment; [Figure 10] FIG. 1 is a block diagram showing an example of the configuration of an STA according to a first embodiment; [Figure 11] An example of a generalized duplex PPDU format [Figure 12] FIG. 10 is a diagram showing an example of setting a coding rate according to configuration example 1 of Low-Density Parity-Check (LDPC). [Figure 13] FIG. 10 is a diagram showing an example of the configuration of an RV according to the first example of LDPC configuration; [Figure 14] FIG. 10 is a diagram showing an example of the configuration of an RV according to the first example of LDPC configuration; [Figure 15] FIG. 10 is a diagram showing an example of setting a coding rate according to LDPC configuration example 2. [Figure 16] FIG. 10 is a diagram showing an example of the configuration of an RV according to configuration example 2 of an LDPC. [Figure 17] FIG. 10 is a diagram showing an example of the configuration of an RV according to configuration example 2 of an LDPC. [Figure 18] FIG. 10 is a diagram showing an example of setting a coding rate according to LDPC configuration example 3. [Figure 19] FIG. 10 is a diagram showing an example of the configuration of an RV according to configuration example 3 of an LDPC. [Figure 20] FIG. 1 is a diagram showing an example of an Extreme High Throughput (EHT) SIG field according to Example 1. [Figure 21] FIG. 10 is a diagram showing an example of an EHT SIG field according to Example 2. [Figure 22] FIG. 10 is a diagram showing an example of a PPDU format of EHT dup mode (Time dup) according to Example 3. [Figure 23] FIG. 10 is a diagram showing an example of an EHT SIG field according to Example 3. [Figure 24] Sequence diagram showing an example of an EHT SIG field according to Method 1 [Figure 25] FIG. 10 is a diagram showing an example of a combination of RVs of subchannels according to Method 1. [Figure 26] FIG. 10 is a diagram showing an example of a Modulation and Coding Scheme (MCS) table according to Method 2. [Figure 27] FIG. 10 is a diagram showing an example of a PPDU format according to another embodiment. [Figure 28] FIG. 10 is a diagram showing an example of a generalized dup mode PPDU format according to another embodiment. [Figure 29] FIG. 10 is a diagram showing an example of a generalized dup mode PPDU format according to another embodiment. [Figure 30] Diagram showing an example of a Joint Transmission (JT) [Figure 31] Diagram showing an example of Distributed Multiple-Input Multiple Output (MIMO) [Figure 32] A diagram showing an example of the PPDU format for Multi-User (MU) DCM DETAILED DESCRIPTION OF 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, DCM is being discussed with the aim of expanding the communication range (also called coverage) 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 a DCM frame format.

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

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

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

[0017] The second method is to duplicate multiple BPSK-DCM signals in an unpunctured frequency bandwidth (e.g., Bandwidth (BW) or channel BW) in the 6 GHz band and transmit them to a single user (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 bandwidths of 40 / 80 / 160 MHz may be duplicated and transmitted using an unpunctured frequency bandwidth of 80 / 160 / 320 MHz in the 6 GHz band.

[0018] FIG. 2 is a diagram showing an example of a BPSK-DCM frame format (PPDU format). In the case of BPSK-DCM, two payload sections correspond to two divided groups of data subcarriers. FIG. 3 is a diagram showing an example of a BPSK-DCM-DUP frame format. In the case of BPSK-DCM-DUP, BPSK-DCM is applied to data subcarriers in the lower half of the transmission bandwidth and duplicated 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 a 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. Furthermore, identification information included in the MCS field (e.g., referred to as the MCS index or EHT-MCS index) is to be determined (TBD) in the formulation of the 11be technical specifications.

[0019] [non-High Throughput(HT) duplicate] Similar to DCM, there is a method of allocating common data to multiple sub-channels called "non-HT duplicate" (see, for example, Non-Patent Document 4). Fig. 4 is a diagram showing an example of a frame format (PPDU format) for 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 20 MHz units, and common data is allocated to each sub-channel.

[0020] Above, an example of a method for extending coverage by allocating common data to multiple sub-channels has been described.

[0021] However, the gains that LPI terminals in the 6 GHz band can obtain through methods such as DCM or non-HT duplication may not be sufficient for coverage extension.

[0022] For example, the transmit power density (Power Spectrum Density (PSD)) of the band available to LPI terminals in the 6 GHz band is smaller than that of the band available to terminals in the 5 GHz band (in other words, the transmit power density is limited). Therefore, even for LPI terminals in the 6 GHz band, which tend to have narrower coverage than the 5 GHz band, it is expected that they will be able to achieve coverage extension similar to that of terminals in the 5 GHz band. In other words, the expected method of coverage extension (also called, for example, mode) may vary depending on communication conditions such as the communication frequency band.

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

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

[0025] For 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 used in IR. The circular buffer is a buffer containing a coded sequence consisting of coded sequence data and parity bits corresponding to the coded sequence data. A buffer index is assigned by dividing the coded sequence contained in the circular buffer by the transmission block size. A circular buffer has the property that if the buffer index exceeds the end of the buffer, it will return to the beginning of the buffer. IR is a method for improving coding gain by, for example, transmitting coded sequences containing different parity bits according to the number of transmissions based on the transmission start position (e.g., called redundancy version (RV)) of the coded sequence stored in the circular buffer on the transmitting side, and combining these coded sequences on the receiving side (hereinafter referred to as "HARQ combining") (see, for example, Non-Patent Document 5). For example, when a signal in which a signal error has occurred is retransmitted, the transmitting side changes the buffer index (e.g., RV) of the circular buffer to transmit a coded sequence different from that of the previously transmitted signal, and the receiving side performs HARQ combining (in other words, if there is no signal error, no retransmission is performed and the RV of the circular buffer is not changed. This process may be repeated until there are no signal errors. Note that even if retransmission is repeated and a coded sequence with the same RV as that of the initially transmitted signal is retransmitted, the coding gain is improved due to time diversity.

[0027] [Wireless communication system configuration] A wireless communication system according to an embodiment of the present disclosure includes at least one access point (AP, also called a "base station") and one terminal (called a "station (STA)"). For example, in Down Link (DL) communication, the AP corresponds to a "downlink wireless transmitting device" and the STA corresponds to a "downlink wireless receiving device." In Up Link (UL) communication, the AP corresponds to an "uplink wireless receiving device" and the STA corresponds to an "uplink wireless transmitting device."

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

[0029] In this way, in the generalized dup mode, a plurality of modes may be set with regard to allocation of a common data signal to at least a plurality of subchannels arranged in the frequency domain.

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

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

[0032] Furthermore, for example, one of the generalized dup modes is "EHT dup mode," which is a mode including BPSK-DCM PPDU or BPSK-DCM-DUP PPDU. Furthermore, the EHT dup mode may include multiple modes (an example of which will be described later) with different RV settings for multiple subchannels.

[0033] For example, the AP may transmit a generalized dup mode PPDU to the STA together with control information related to the generalized dup mode. The STA may identify (or determine or distinguish) the generalized dup mode set for the STA based on the control information related to the generalized dup mode, and perform reception processing for the generalized dup mode PPDU.

[0034] The following describes, as an example, a method in which an AP transmits a generalized duplication mode PPDU to a STA in 11be.

[0035] FIG. 6 is a sequence diagram illustrating an example of operation of the AP 100 and the STA 200 in the wireless communication system according to an embodiment of the present disclosure regarding transmission of a generalized dup mode PPDU.

[0036] 6, the STA 200 transmits an association request signal including capability information (e.g., referred to as Capability) related to the generalized dup mode of the STA 200 to the AP 100 (S101). The STA 200 may request a connection to the AP 100 by transmitting the association request signal.

[0037] For example, the AP 100 transmits an association response signal to the STA 200 in response to the association request signal from the STA 200 (S102). The AP 100 may permit the STA 200 to connect to the AP 100 by transmitting the association response signal.

[0038] The signal that the STA 200 transmits to the AP 100 including the capability related to the generalized dup mode is not limited to an association request signal, but may be other signals such as a beacon signal, a probe response signal, or a re-association signal.

[0039] AP100 determines a generalized dup mode for the transmission signal addressed to STA200 based on, for example, at least one of the capability of STA200 and the received signal strength (e.g., called Received Signal Strength Indicator (RSSI)) of a signal (e.g., an association request signal) from STA200 acquired from STA200, and allocates resources such as frequency resources (called Resource Unit (RU)) or data subcarriers to each subchannel (S103).

[0040] It should be noted that "distribution" may be interchangeably read as other terms such as "allocation" and "mapping" to multiple subchannels.

[0041] Furthermore, the AP 100 generates a generalized dup mode PPDU based on, for example, resource information allocated for each subchannel (S104), and transmits the generated generalized dup mode PPDU to the STA 200 (S105).

[0042] The STA 200 performs, for example, a receiving process for the generalized dup mode PPDU transmitted from the AP 100 (S106). For example, the STA 200 may demodulate and decode the data signal included in the generalized dup mode PPDU of each subchannel based on a channel estimation value acquired using a reference signal (e.g., a Long Training Field (LTF)) included in the preamble portion of the generalized dup mode PPDU and control information related to the generalized dup mode included in the preamble portion.

[0043] The STA 200 generates a response signal (Acknowledge (ACK)) based on the result of the reception processing of the data signal, and transmits the ACK (for example, information indicating whether there is an error or not) to the AP 100 (S107).

[0044] An example of the operation of the AP 100 and the STA 200 regarding transmission of a generalized duplication mode PPDU has been described above.

[0045] 7 is a block diagram illustrating a configuration example of a portion of an AP 100 according to an embodiment of the present disclosure. In the AP 100 (e.g., a communication device) illustrated in FIG. 7, a control unit (e.g., a control circuit) sets one of a plurality of modes (e.g., generalized dup mode) relating to allocation of common data signals to a plurality of subchannels arranged at least in the frequency domain to the STA 200. A transmission unit (e.g., a transmission circuit) transmits information relating to the mode set to the STA 200 and signals allocated to the plurality of subchannels.

[0046] 8 is a block diagram illustrating a configuration example of a portion of STA200 according to an embodiment of the present disclosure. In STA200 (e.g., corresponding to a communication device) illustrated in FIG. 8, a receiver (e.g., corresponding to a receiving circuit) receives information regarding a mode to be set in STA200 from among a plurality of modes (e.g., generalized dup mode) regarding allocation of common data signals to a plurality of subchannels arranged at least in the frequency domain. A controller (e.g., corresponding to a control circuit) controls combining of signals allocated to the plurality of subchannels based on the information regarding the mode.

[0047] [AP100 configuration example] Fig. 9 is a block diagram showing an example configuration of AP 100 (for example, a downlink wireless transmission device). AP 100 shown in Fig. 9 may include, for example, a wireless receiving unit 101, a received signal decoding unit 102, a resource allocating unit 103, a data generating unit 104, a data encoding unit 105, a data modulating unit 106, a preamble generating unit 107, and a wireless transmitting unit 108.

[0048] For example, at least one of the received signal decoding unit 102, the resource distribution 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 radio transmission unit 108 may be included in the transmission unit shown in FIG.

[0049] The radio receiving unit 101 receives a signal transmitted from the STA 200 (for example, a downlink radio receiving device) via an antenna, and performs radio receiving processing such as down-conversion and Analog-to-Digital (A / D) conversion on the received signal. The radio receiving unit 101 divides the received signal after the radio receiving processing into a preamble part (also called a preamble signal) and a data part (also called a data signal), and outputs them 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 each of the preamble signal and data signal input from the radio receiving unit 101, and extract control signals included in each of the preamble signal and data signal. The control signals may include, for example, a frequency bandwidth (BW), an MCS, or an encoding method.

[0051] Furthermore, the received signal decoding unit 102 may, for example, use a control signal acquired from the preamble signal and a channel estimation signal to channel equalize, demodulate, and decode the data signal after FFT, and perform error detection such as a Cyclic Redundancy Check (CRC). For example, if there is no error in the data signal (in other words, a decoding error), the received signal decoding unit 102 outputs the decoded data signal and control signal to the resource allocation unit 103. On the other hand, for example, if there is an error in the data signal, the received signal decoding unit 102 does not need to output the decoded data signal.

[0052] The resource allocating unit 103 determines a generalized dup mode of a data signal to be transmitted to the STA 200, for example, based on reception quality information (e.g., Packet Error Rate (PER) or RSSI) of the data signal input from the received signal decoding unit 102 or the capability of the STA 200. Furthermore, the resource allocating unit 103 allocates (or assigns or maps) resources such as the number of subchannels, the number of data subcarriers, and frequency resources (e.g., RUs) to the subchannels, for example, based on the determined generalized dup mode. The resource allocating unit 103 outputs information on the allocated resources (for example, referred to as resource allocation information) to the data generating unit 104, the data encoding unit 105, the data modulating unit 106, and the preamble generating unit 107, for example.

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

[0054] Data coding section 105 divides the data sequence input from data generation section 104 and the allocated data subcarriers into subchannels, for example, based on resource allocation information (for example, the division number of data subcarriers or data subcarrier information) input from resource allocation section 103. Then, data coding section 105 performs encoding for each subchannel, for example, and outputs the encoded data to data modulation section 106.

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

[0056] The preamble generating unit 107 generates a preamble signal based on, for example, resource allocation information input from the resource allocating unit 103. The preamble signal includes, for example, control information related to the generalized dup mode (for example, the number of divisions of the data subcarriers, i.e., the number of subchannels (Number of Duplicates (N))). dup For example, the preamble generating unit 107 performs modulation and IFFT processing on the preamble signal and outputs the preamble signal to the radio transmitting unit .

[0057] The wireless transmission unit 108 generates a wireless frame (which may be referred to as, for example, a "packet signal" or a "packet") that includes the data signal input from the data modulation unit 106 and the 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 an antenna.

[0058] <Configuration example of STA200> FIG. 9 is a block diagram showing a configuration example of the STA200 (for example, a downlink 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 an antenna, and performs wireless reception processing such as down-conversion and A / D conversion on the received signal. The wireless reception unit 201 extracts a 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 a 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 radio receiving unit 201, and extracts, for example, a control signal (e.g., BW, MCS, or encoding method) used for demodulating and decoding a data signal from the demodulated preamble signal. The preamble demodulation unit 202 outputs, for example, the extracted control signal to the data demodulation unit 203 and the data decoding unit 205. The preamble demodulation unit 202 also performs channel estimation based on, for example, a reference signal (e.g., LTF) included in the preamble signal, and outputs channel estimation information to the data demodulation unit 203. The preamble demodulation unit 202 also outputs, for example, control information related to the generalized dup mode included in the preamble signal (e.g., the number of subchannels or the type of generalized dup mode) to the data combining unit 204.

[0062] The data demodulation unit 203 performs processing such as FFT, channel equalization, or demodulation on the data signal input from the radio receiving unit 201, for example, based on 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] Data combining section 204 determines whether to combine the decoded data signals input from data demodulation section 203, based on the control information input from preamble demodulation section 202. For example, if the communication mode corresponding to the demodulated data signals is different from generalized dup mode (non-generalized dup mode), data combining section 204 outputs the demodulated data signals input from data demodulation section 203 to data decoding section 205. On the other hand, for example, if the communication mode corresponding to the demodulated data signals is generalized dup mode, data combining section 204 performs data combination based on the type of generalized dup mode, and outputs the combined data to data decoding section 205.

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

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

[0066] The wireless transmitting unit 207 performs wireless transmission processing such as D / A conversion and up-conversion to a carrier frequency on the wireless frame input from the transmission signal generating unit 206, and transmits the signal after wireless transmission processing to the AP 100 via an antenna.

[0067] [Example of AP100 and STA200 operation] Next, an example of the operation of the AP 100 and the STA 200 according to this embodiment will be described.

[0068] In one embodiment of the present disclosure, the multiple generalized dup modes that can be set in STA200 may include an EHT dup mode in which a signal (e.g., an encoded sequence) corresponding to one of the RVs of an error correction code for a data signal is included in multiple subchannels.

[0069] For example, the EHT dup mode may include a mode in which individual RVs (e.g., different RVs) are assigned to data subcarriers (or subchannels). In other words, the EHT dup mode may include a mode in which the RVs of subchannels are changed.

[0070] In this mode, in the EHT dup mode PPDU, different RV encoded sequence data stored in the cyclic buffer like HARQ-IR may be allocated to a plurality of sub-channels.

[0071] FIG. 11 is a diagram showing an example of the EHT dup mode PPDU format including encoded sequences with different RVs for each sub-channel. In the example shown in FIG. 11, a plurality of data sub-carriers are divided into two sub-channels, RV = 0 is allocated to one sub-channel, and RV = 1 is allocated to the other sub-channel. By allocating different RVs for each sub-channel, on the receiving side (e.g., STA200), an encoding gain by HARQ combining can be obtained, 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 (for example, coding rate = 1 / 3 or 1 / 4) may be set. Hereinafter, as an example of an error correction code, a configuration example of RV when 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 realize a coding rate smaller than 1 / 2 by using an encoder with a coding rate of 1 / 2.

[0075] For example, AP100 may realize a coding rate of 1 / 4 by encoding the 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 - time encoding to achieve an encoding rate of 1 / 3. At this time, AP100 may, for example, change the puncturing pattern of the encoded data bits for each RV. By changing the puncturing pattern, different parity bits are more likely to be transmitted, so that an encoding gain by HARQ combination can be obtained.

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

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

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

[0080] For example, as shown in FIG. 12, based on an information bit length of 972 bits with an encoding rate of 1 / 2, the cyclic buffer generated when 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, when there is no IR) is 1944 bits, while the CW length with an encoding rate of 1 / 3 (for example, when there is 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, the AP 100 may transmit by including RV = 0 (for example, information bits and parity bit 1) in subchannel 1 and including RV = 1 (for example, information bits and parity bit 2) in subchannel 2. 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.

[0082] Similarly, for example, based on an information bit length = 972 bits with a coding rate = 1 / 2, when the target coding rate = 1 / 4, the generated cyclic buffer is composed of information bits (for example, 972 bits) and parity bits 1, 2, 3 (for example, 972 bits each). In this case, for example, when the CW length with a coding rate = 1 / 2 (for example, in the case of no IR) is 1944 bits, the CW length with a coding rate = 1 / 4 (for example, 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, the AP 100 may transmit by including RV = 0 (for example, information bits and parity 1) in subchannel 1 and including RV = 1 (for example, parity 2 and parity 3) in subchannel 2. In this case, since different RVs are transmitted in a plurality of subchannels, a gain due to HARQ combining can be obtained.

[0083] <Example Configuration 2 of LDPC> In Example Configuration 2 of LDPC, for example, in the case of a mode in which coded sequences with different RVs are included in each subchannel (in the case of having IR), the target coding rate is realized by setting (or rather, 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 = 972 bits for coding rate = 1 / 2, a circular buffer generated when the target coding rate = 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, the information bit length for coding rate = 1 / 2 (e.g., without IR) is 972 bits, while the information bit length for coding rate = 1 / 3 (e.g., with IR) is 648 bits.

[0086] In LDPC configuration example 2, as shown in FIG. 15, the CW length is the same whether IR is present or not.

[0087] For example, as shown in FIG. 16, when a specified CW length (e.g., 1296 bits) is used as a transmission unit, AP 100 may transmit sub-channel 1 with RV=0 (e.g., information bit and parity bit 1) and sub-channel 2 with RV=1 (e.g., information bit and parity bit 2). In this case, since common information bits are transmitted in multiple channels, a gain is obtained by DCM. Also, since different RVs are transmitted in multiple sub-channels, a gain is obtained by HARQ combining.

[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 transmit by including RV = 0 (e.g., information bits and parity bits 1 and 2) in subchannel 1 and including RV = 1 (e.g., information bits and parity bits 1 and 3) in subchannel 2. In this case, since common information bits are transmitted in multiple subchannels, a gain due to DCM can be obtained. Also, since different RVs are transmitted in multiple subchannels, a gain due to HARQ combining can be obtained.

[0089] <Example Configuration 3 of LDPC> In LDPC configuration example 3, 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 (or rather, 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 is 1944 bits, the circular buffer obtained by a generating polynomial with a coding rate of 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 circular buffer obtained by a generating polynomial with a coding rate of 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, and 3 (for example, 324 bits each). Note that the coded sequence for each RV included in the subchannel does not need to include dummy data bits.

[0093] In this way, in LDPC configuration example 3, the data bit length of the information bits when IR is present is changed from the data bit length of the information bits when IR is absent, thereby achieving the target coding rate.

[0094] For example, as shown in Fig. 19, when the transmission unit is a specified CW length of 648 bits, AP 100 may transmit RV = 0 (e.g., information bit and parity bit 1) in sub-channel 1 and RV = 1 (e.g., parity bits 2 and 3) in sub-channel 2. In this case, different RVs are transmitted in multiple sub-channels, and thus a gain is obtained by HARQ combining.

[0095] The above describes an example of the RV configuration.

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

[0097] <Example 1> The EHT dup mode may include, for example, a mode in which both the modulation mapping for signals (e.g., coded sequences) allocated to two or more subchannels and the RV 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 at least a part of the common coded sequences in multiple sub-channels. Also, in the EHT dup mode (DCM+IR), for example, coded sequences with different RVs are included in multiple sub-channels.

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

[0100] As shown in FIG. 20, the AP 100 may transmit, for example, control information related to the EHT dup mode (DCM+IR) to the STA 200. The control information related to the EHT dup mode (DCM+IR) may include, for example, the number of divisions of the data subcarriers (for example, the number of subchannels (Number of Duplicates (N)) dup ))), information indicating the type of generalized dup mode (here, EHT dup mode (DCM+IR)) (for example, generalized DUP mode), and information indicating the RV for each subchannel.

[0101] In FIG. 20, as an example, the number of sub-channels N dupis included in a common field common to multiple users (STAs), and generalized dup mode and RV are included in a user specific field specific to each user (STA). However, the fields including each piece of 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] 20, the coded sequence with RV=0 included in sub-channel 1 and the coded sequence with RV=2 included in sub-channel 2 have at least a part in common. For example, the coded data bits of sub-channel 1 and sub-channel 2 may be common, but the parity bits may be different.

[0103] EHT dup mode (DCM+IR) provides, for example, frequency diversity gain by transmitting at least some of the common data for each subchannel using different modulation mappings, and coding gain by HARQ combining (transmitting different RVs for each subchannel).

[0104] <Example 2> The EHT dup mode may include, for example, a mode in which 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 DCM in BPSK-DCM or BPSK-DCM-DUP is changed to IR.

[0105] In the EHT dup mode (IR), for example, different RV coding sequences are included in multiple sub-channels. Also, in the EHT dup mode (IR), for example, different modulation mappings do not need to be performed in multiple sub-channels.

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

[0107] 21, the AP 100 may transmit control information related to the EHT dup mode (IR) to the STA 200. The control information related to the EHT dup mode (IR) may include, for example, the number of sub-channels 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 sub-channel may be included.

[0108] In FIG. 21, as an example, the number of sub-channels N dup is included in the common field, and generalized dup mode and RV are included in the User specific field, but 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.

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

[0110] EHT dup mode (IR) provides, for example, a frequency diversity gain by transmitting the RV of coded sequence data for each subchannel, and a coding gain by HARQ combining.

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

[0112] In the EHT dup mode (Time dup), for example, among a plurality of subchannels arranged in the frequency domain (also called the frequency direction) and the time domain, the RVs between the subchannels at least in the time domain may be different. For example, in the EHT dup mode (Time dup), coded sequences with different RVs may be included in a plurality of different subchannels in the frequency domain and the time domain.

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

[0114] 23, the AP 100 may notify the STA 200 of control information relating to the EHT dup mode (time dup), for example. The information relating to the EHT dup mode (time dup) may include, for example, the number of sub-channels 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 sub-channel may be included.

[0115] In FIG. 23, as an example, the number of sub-channels N dup is included in the common field, and generalized dup mode and RV are included in the User specific field, but the fields containing each piece of 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.

[0116] Furthermore, in EHT dup mode (Time dup), for example, the RV may be changed for each MAC Service Data Unit (MPDU), as shown in Fig. 22. For example, STA 200 may refer to the MAC header of each MPDU included in the received signal, and if the MPDUs include a common sequence number, identify that the RV included in the MPDU corresponding to the MAC header is a coded sequence of the RV that references a common (for example, the same) circular buffer.

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

[0118] EHT dup mode (Time dup) transmits coded sequences with different RVs in the time domain as well as the frequency domain, thereby increasing the number of coded sequences that can be transmitted for HARQ combining and improving the coding gain.

[0119] For the frequency domain in Example 3, for example, the example of allocating the RV coded sequence in Example 1 or Example 2 may be applied.

[0120] Above, examples of modes in which coded sequences with different RVs are included in each sub-channel have been described.

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

[0122] <Method 1> In method 1, part of the user information (for example, information in a user specific field) is replaced with control information related to the generalized dup mode.

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

[0124] For example, in BPSK-DCM and BPSK-DCM-DUP of 11be, the number of spatial streams is set to 1 (in other words, limited). Therefore, for example, in BPSK-DCM and BPSK-DCM-DUP, the number of spatial streams is fixedly set in STA 200, so control information regarding the number of spatial streams does not need to be notified to STA 200. Therefore, as shown in Fig. 24, part of the user information may be replaced with control information regarding the generalized dup mode based on the type of generalized dup mode (for example, DCM+IR, IR, or Time dup).

[0125] For example, as shown in FIG. 24, in the EHT dup mode, the AP 100 and the STA 200 use the Number of Space-Time Streams subfield (N) included in the User specific field of the EHT-SIG. sts ) (for example, 4 bits) as the number of sub-channels 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, the AP 100 and the STA 200 may replace the Reserved subfield of the EHT-SIG with a retransmission identifier (called a New Data Indicator (NDI)) (for example, 1 bit). In other words, the STA 200 may replace the field of information different from the information related to the generalized dup mode (NDI in FIG. 24) among the User specific fields (control fields for individual terminals). sts In at least part of the field (or Reserved field), information about the generalized dup mode may be received.

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

[0128] For example, as shown in Fig. 25, the STA 200 determines the combination of RVs for each sub-channel based on notification information from the AP 100, such as control information related to the generalized dup mode and the length of the circular buffer. For example, in Fig. 25, the STA 200 may identify the RVs of sub-channels 2 to 4 other than sub-channel 1 based on the notification information. In Fig. 25, L represents the circular buffer length, and N rv indicates the number of RVs contained in the circular buffer.

[0129] Method 1 allows AP 100 to notify STA 200 of control information related to generalized dup mode without additional signaling, thereby suppressing an increase in signaling overhead.

[0130] In addition, in Figure 24, N sts RV and number of subchannels N in the field dup The example where the reserved field contains NDI has been explained. sts The control information regarding the generalized dup mode included in the Reserved field and the Generalized dup mode is not limited to these. sts The field is not limited to the Reserved field and the Reserved field, but may be any other field.

[0131] <Method 2> In method 2, control information related to the generalized dup mode is notified to STA 200 in combination with MCS.

[0132] Fig. 26 is a diagram showing an example of information indicating the association between a combination of an MCS index (for example, an EHT MCS index) and control information (for example, including control information related to generalized dup mode) according to Method 2. Fig. 26 shows an example in which the association is represented in a table format (MCS Table).

[0133] In the MCS table shown in FIG. 26, for example, the type of generalized dup mode (Modulation), the coding rate, the number of sub-channels (N dup The MCS table may include control information for generalized dup modes such as the modulation scheme for the data signal, BPSK, Quadrature Phase Shift Keying (QPSK), 16-Quadrature Amplitude Modulation (QAM), 64-QAM, 256-QAM, 1024-QAM, or 4096-QAM as modulation candidates (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] The MCS index associated with the generalized dup mode may be any value (represented using "To be determined" (TBD) in FIG. 26). For example, a 4-bit MCS index similar to that of 11ax may be used to indicate each mode of the generalized dup mode using some of MCS12 to MCS15, which are unused in 11ax, or the MCS index may be extended to 5 bits or more to indicate each mode of the generalized dup mode using an index of MCS16 or higher. Furthermore, the generalized dup modes included in the MCS table are not limited to the example shown in FIG. 26, and may include other generalized dup modes or may be combinations of other generalized dup modes.

[0135] For example, the STA 200 receives the MCS index notified from the AP 100, and based on the received MCS index, refers to the MCS table shown in FIG. 26 to determine the type of generalized dup mode and the number of sub-channels N dup and the RV of each sub-channel may be determined.

[0136] According to method 2, AP 100 can notify STA 200 of control information related to the generalized dup mode using the MCS table, even when the number of spatial streams of DCM is not set to 1. Therefore, AP 100 can notify STA 200 of control information related to the generalized dup mode without additional signaling, thereby suppressing an increase in signaling overhead.

[0137] An example of a method for notifying control information related to the generalized dup mode has been described above.

[0138] Thus, in this embodiment, STA200 receives control information regarding the generalized dup mode to be set for STA200 from among multiple generalized dup modes, and controls the combination of signals allocated to multiple subchannels based on the received information regarding the generalized dup mode.

[0139] This control allows STA200 to communicate by switching the expected coverage extension method (e.g., generalized dup mode) according to communication conditions such as the communication frequency band. Also, in the generalized dup mode, STA200 can improve coverage by frequency diversity gain or coding gain achieved by the generalized dup mode by setting individual RVs for subchannels. This allows coverage extension similar to that of the 5 GHz band to be achieved, for example, in a frequency band usable by LPI terminals in the 6 GHz band (or a frequency band where transmission power density may be limited), where coverage tends to be narrower than that of terminals in the 5 GHz band.

[0140] Therefore, according to this embodiment, it is possible to improve the communication quality in wireless communication.

[0141] The embodiments of the present disclosure have been described above.

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

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

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

[0145] (4) In the above-described embodiment, a method for notifying an RV for each subchannel was described. However, for example, the RV to be included in the generalized dup mode PPDU for the initial transmission (for example, when NDI=0) may be fixed for each subchannel.

[0146] For example, the generalized dup mode PPDU for the first transmission may include a fixed coded sequence with RV=0 for subcarrier 1 and RV=1 for subcarrier 2. Therefore, for example, the generalized dup mode PPDU for the first transmission does not need to include control information related to the RV for each subchannel. This reduces the signaling related to the RV, thereby improving overhead.

[0147] (5) In the above-described embodiment, for example, a midamble may be included in the data portion. The midamble allows adaptation to, for example, a fast fading environment.

[0148] 27 is a diagram illustrating an example of a frame format (for example, a PPDU format) when a midamble (for example, EHT-LTF) is included. The AP 100 may notify the STA 200 whether or not a midamble is included in the data portion of the Doppler field included in the preamble portion, similar to 11ax, for example.

[0149] Also, the AP 100 may change the RV of the data section before and after the Midamble, for example.

[0150] Also, for example, when the Doppler field included in the preamble portion of the received signal is 1, the STA 200 uses the N sts At least a part of the above may be replaced with the Midamble period. For example, the STA200 may use N sts The least significant bit of N may be interpreted as the Midamble period (called Midamble periodicity). sts If the least significant bit of is 0, it is interpreted as a midamble periodicity=10 data symbol, and N sts If the least significant bit of the symbol is 1, it may be interpreted as a midamble periodicity=20 data symbol.

[0151] The STA 200 can obtain a channel estimation value that tracks fast fading fluctuations, for example, by using a reference signal (for example, LTF) included in Midamble.

[0152] Also, for example, in the above-mentioned <Example 3>, a midamble may be included between subchannels of different time domains of the RV. In this case, the AP 100 may notify the presence or absence of a midamble by, for example, a Doppler field. In this case, the STA 200 may notify the presence or absence of a midamble by, for example, a Doppler field. sts It is not necessary to convert part of it into Midamble's period.

[0153] (6) In the above-described embodiment, the size of the RU to which the transmission signal is allocated is not limited. Also, for example, multiple RUs may be allocated to one STA 200 (e.g., referred to as "Multi-RU").

[0154] Fig. 28 shows an example of a generalized dup mode PPDU format when using an RU with a frequency higher than 80 MHz, and Fig. 29 shows an example of a generalized dup mode PPDU format when using Multi-RU.

[0155] In these cases, the STA 200 performs reception processing for, for example, an 80 MHz segment including the primary channel. The STA 200 determines the size of the RU allocated to the STA 200 based on the values ​​of the BW field and the Puncturing information field included in the preamble portion.

[0156] For example, as shown in FIG. 28, if the RU allocated to STA200 is greater than 80 MHz, STA200 may perform reception processing of other 80 MHz segments that do not include the primary channel, and perform HARQ combining of coded sequences for each subchannel included in multiple RUs allocated to STA200.

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

[0158] (7) An embodiment of the present disclosure may be applied to multi-AP operation. Figures 30 and 31 are diagrams illustrating an example 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 duplex mode PPDU (including RV=0, 2 in Fig. 30) to the STA 200 (e.g., called Joint Transmission (JT)). This provides a beamforming gain due to JT in addition to the coding gain due to HARQ combining.

[0160] Also, for example, as shown in Fig. 31, two or more APs 100 (AP1 and AP2 in Fig. 31) may simultaneously transmit generalized dup mode PPDUs including coded sequences with different RVs to the STA 200 (for example, this is called Distributed MIMO). This increases the number of coded sequences used for HARQ combining, thereby improving coding gain.

[0161] (8) In the above-described embodiment, in the case of a generalized dup mode in which IR is not performed but DCM is performed, the patterns of the BCC interleaver and LDPC tone mapper may be changed for each subchannel.

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

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

[0164] As an example, AP 100 may transmit spatially multiplexed data to STA1 that supports DCM and STA2 that does not support DCM. Fig. 32 is a diagram showing an example of the PPDU format of the MU DCM signal in this case.

[0165] For example, AP 100 may transmit signals to which DCM has been applied to data for both STA1 and STA2. STA1 supports DCM, and therefore, for example, receives signals transmitted from AP 100 on each subchannel and extracts and combines signals addressed to STA1, thereby obtaining frequency diversity gain through DCM. STA2 does not support DCM, and therefore, for example, receives signals transmitted from AP 100 on the primary channel and extracts and decodes signals addressed to STA2.

[0166] (10) In the above embodiment, a configuration example based on the 11ax frame format has been described as an example. 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 linked to hardware. Each functional block used in the description of the above embodiments may be realized, in part or in whole, as an LSI, which is an integrated circuit, and each process described in the above embodiments may be controlled, in part or in whole, by a single LSI or a combination of LSIs. The LSI may be composed of individual chips, or may be composed of a single chip that includes some or all of the functional blocks. The LSI may have data input and output. Depending on the degree of integration, the LSI may be called an IC, system LSI, super LSI, or ultra LSI.

[0169] The integrated circuit method is not limited to LSI, but may be realized by a dedicated circuit, a general-purpose processor, or a dedicated processor. Also, a field programmable gate array (FPGA) that can be programmed after LSI manufacturing, or a reconfigurable processor that can reconfigure the connections and settings of circuit cells within the LSI, may be used. The present disclosure may be realized as digital processing or analog processing.

[0170] Furthermore, if an integrated circuit technology that can replace LSI emerges due to advances in semiconductor technology or other derivative technologies, it is natural that such technology can be used to integrate functional blocks. The application of biotechnology is also a possibility.

[0171] The present disclosure may be implemented in any type of apparatus, device, or system (collectively referred to as a communications apparatus) that has a communications function. The communications apparatus may include a wireless transceiver and processing / control circuitry. The wireless transceiver may include a receiver and a transmitter, or both functions. The wireless transceiver (transmitter and receiver) may include a radio frequency (RF) module and one or more antennas. The RF module may include an amplifier, an RF modulator / demodulator, or the like. Non-limiting examples of communication devices include telephones (e.g., cell phones, smartphones), tablets, personal computers (PCs) (e.g., laptops, desktops, notebooks), cameras (e.g., digital still / video cameras), digital players (e.g., digital audio / video players), wearable devices (e.g., wearable cameras, smartwatches, tracking devices), game consoles, digital book readers, telehealth / telemedicine devices, communication-enabled vehicles or mobile transportation (e.g., cars, airplanes, ships), and combinations of the above devices.

[0172] Communications equipment is not limited to portable or mobile equipment, but also includes non-portable or fixed equipment, devices, and systems of any kind, such as smart home devices (such as appliances, lighting equipment, smart meters or metering devices, control panels, etc.), vending machines, and any other "things" that may exist on an IoT (Internet of Things) network.

[0173] Communications include data communications via cellular systems, wireless LAN systems, communications satellite systems, etc., as well as data communications via combinations of these.

[0174] A communications apparatus also includes devices such as controllers and sensors connected or coupled to a communications device that performs the communications functions described in this disclosure, such as controllers and sensors that generate control and data signals used by the communications device to perform the communications functions of the communications apparatus.

[0175] The communication apparatus also includes infrastructure facilities, such as base stations, access points, and any other apparatus, device, or system that communicates with or controls the various apparatuses listed above, but are not limited to these.

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

[0177] In one embodiment of the present disclosure, the multiple modes include a first mode, which indicates that a signal corresponding to one of the redundancy versions (RVs) of an error correcting code for the data signal is included in the multiple subcarrier groups.

[0178] In one embodiment of the present disclosure, in the first mode, both the RV and modulation mapping are different among the multiple subcarrier groups.

[0179] In one embodiment of the present disclosure, in the first mode, the RVs differ among the plurality of subcarrier groups.

[0180] In one embodiment of the present disclosure, in the first mode, the RVs between subcarrier groups arranged in the time domain are different.

[0181] In one embodiment of the present disclosure, the receiving circuit receives information about the mode in at least a portion of a field of information different from the information about the mode, among terminal-specific control fields.

[0182] In one embodiment of the present disclosure, each of a plurality of candidates including a modulation scheme 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 for allocating a common data signal to a plurality of subcarrier groups, and a transmission circuit that transmits information about the mode and a signal allocated to the plurality of subcarrier 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 for allocating a common data signal to a plurality of subcarrier groups, and controls combining of signals allocated to the plurality of subcarrier 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 for allocating a common data signal to a plurality of subcarrier groups, and transmits information regarding the mode and the signal allocated to the plurality of subcarrier groups.

[0186] The disclosures of the specification, drawings and abstract contained in Japanese Patent Application No. 2020-185778, filed on November 6, 2020, are incorporated herein by reference in their entirety. [Industrial Applicability]

[0187] One embodiment of the present disclosure is useful in wireless communication systems. [Explanation of symbols]

[0188] 100 AP 101,201 Radio receiver 102 Received signal decoding unit 103 Resource Distribution Unit 104 Data Generation Unit 105 Data Encoding Unit 106 Data modulation section 107 Preamble generator 108,207 Radio transmitter 200 STA 202 Preamble demodulation section 203 Data demodulation unit 204 Data Synthesis Unit 205 Data Decoding Unit 206 Transmission signal generation unit

Claims

1. a receiving circuit that receives a Physical Layer Convergence Procedure Protocol Data Unit (PPDU) including a first data signal and a second data signal generated from common information bits, and a signaling field that includes information indicating at least one of a plurality of modes for allocating the first data signal and the second data signal to a plurality of subcarrier groups; a control circuit that processes the first data signal and the second data signal assigned to the plurality of subcarrier groups based on the information. Communication equipment.

2. The information is included in a User specific field of the signaling field. The communication device according to claim 1 .

3. The signaling field includes a Modulation and Coding Scheme (MCS) field; The plurality of modes are respectively associated with a plurality of candidates for the value indicated by the MCS field. The communication device according to claim 1 .

4. The signaling field is an Extreme High Throughput (EHT)-SIG field including a Common field and a User specific field, The MCS field is included in the User specific field, The value is the EHT-MSC index. The communication device according to claim 3 .

5. the receiving circuit receives the information in at least a part of a field of information different from the information in a terminal-specific control field; The communication device according to claim 1 .

6. each of a plurality of candidates including the modulation schemes and the plurality of modes for the first data signal and the second data signal is associated with identification information, and the receiving circuit receives the identification information associated with any one of the plurality of candidates; The communication device according to claim 1 .

7. The plurality of subcarrier groups include a Resource Unit (RU), The communication device according to claim 1 .

8. the transmission start positions of the coded sequences are different among the plurality of subcarrier groups; The communication device according to claim 1 .

9. The plurality of modes includes a first mode, which indicates that a signal corresponding to one of redundancy versions (RVs) of an error correcting code for the first data signal and the second data signal is included in the plurality of subcarrier groups. The communication device according to claim 1 .

10. In the first mode, both the RV and modulation mapping are different among the plurality of subcarrier groups. The communication device according to claim 9.

11. In the first mode, the RV differs among the plurality of subcarrier groups. The communication device according to claim 9.

12. In the first mode, the RVs between subcarrier groups arranged in the time domain are different. The communication device according to claim 9.

13. receiving a Physical Layer Convergence Procedure Protocol Data Unit (PPDU) including a first data signal and a second data signal generated from common information bits, and a signaling field including information indicating at least one of a plurality of modes for allocating the first data signal and the second data signal to a plurality of subcarrier groups; processing the first data signal and the second data signal assigned to the plurality of subcarrier groups based on the information; Communication method.

14. receiving a Physical Layer Convergence Procedure Protocol Data Unit (PPDU) including a first data signal and a second data signal generated from common information bits, and a signaling field including information indicating at least one of a plurality of modes for allocating the first data signal and the second data signal to a plurality of subcarrier groups; and processing the first data signal and the second data signal assigned to the plurality of subcarrier groups based on the information. Integrated circuit.

Images