# US 2026/0100779 A1 · Communication method and apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2026/0100779 A1 - Document ID: US20260100779A1 - Status: Published application - Kind: A1 - Application number: 19/417,290 - Filed: 2025-12-11 - Published: 2026-04-09 - Earliest claimed: 2023-07-07 - Assignees: Huawei Technologies Co., Ltd. - Applicants: Huawei Technologies Co., Ltd. - Inventors: Bo Gong; Jian Yu; Mengshi Hu; Ming Gan; Wei Ruan - Web page: https://patentgrep.com/patent/US20260100779A1 ## CPC - H04L 1/0025: {Transmission of mode-switching indication} - H04L 1/003: {Adaptive formatting arrangements particular to signalling, e.g. variable amount of bits} - H04L 1/0003: {by switching between different modulation schemes} - H04L 1/0005: {applied to payload information} - H04L 1/0009: {by adapting the channel coding (H04L1/1812 takes precedence)} - H04L 1/0011: {applied to payload information} - H04L 1/0016: {involving special memory structures, e.g. look-up tables} - H04L 1/0023: {characterised by the signalling} - H04L 1/0031: {Multiple signaling transmission (H04L1/1664, F15 take precedence)} - H04L 1/0041: {Arrangements at the transmitter end} - H04L 1/0075: {Transmission of coding parameters to receiver (H04L1/0023 takes precedence)} - H04L 1/0618: {Space-time coding} - H04L 5/0046: {Determination of the number of bits transmitted on different sub-channels} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04L 27/0008: {arrangements for allowing a transmitter or receiver to use more than one type of modulation (negotiating modulation type for two-way transmission paths H04L5/1453)} - H04L 27/0012: {arrangements for identifying the type of modulation} - H04L 27/18: Phase-modulated carrier systems, i.e. using phase-shift keying (H04L27/32 takes precedence) - H04L 1/08: by repeating transmission, e.g. Verdan system {(H04L1/1858 and H04L1/189 take precedence)} - H04L 27/34: Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems - H04L 27/36: Modulator circuits; Transmitter circuits - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A communication method and apparatus are provided, are applied to the field of communication technologies, may be applied to a wireless local area network system supporting 802.11 series protocols such as a next-generation Wi-Fi protocol of IEEE 802.11ax like 802.11be, Wi-Fi 7, or EHT, and 802.11bn, Wi-Fi 8, UHR, Wi-Fi AI, or millimeter wave (MMW), and may be further applied to a WPAN system, a sensing system, and the like supporting UWB. A first communication apparatus generates a PPDU, and sends the PPDU. A second communication apparatus receives the PPDU, and parses the PPDU. The PPDU includes first indication information. The first indication information may indicate a first modulation scheme set and a coding rate. The first modulation scheme set is one of N modulation scheme sets obtained through classification based on W modulation schemes. Q modulation schemes in the first modulation scheme set are used to modulate the PPDU. ## Claims ### Claim 1 A communication method, wherein the method comprises: generating, by a first communication apparatus, a physical protocol data unit (PPDU), wherein the PPDU comprises first indication information indicating Q modulation schemes in W modulation schemes, a difference between numbers of modulation bits of modulation symbols of any two modulation schemes in the Q modulation schemes is less than a first value, the W modulation schemes comprise at least one of the following: 4096 quadrature amplitude modulation (QAM), 1024QAM, 256QAM, and binary phase shift keying-dual carrier modulation (BPSK-DCM), and Q is a positive integer less than W; and sending, by the first communication apparatus, the PPDU. ### Claim 2 (depends on 1) The method according to claim 1, wherein the first indication information indicates the second communication apparatus to demodulate the PPDU based on the Q modulation schemes. ### Claim 3 (depends on 1) The method according to claim 1, wherein the W modulation schemes further comprise at least one of the following: 64QAM, 16QAM, quadrature phase shift keying QPSK, and BPSK. ### Claim 4 (depends on 1) The method according to claim 1, wherein the first value is 10, or the first value is 8. ### Claim 5 (depends on 1) The method according to claim 1, wherein the W modulation schemes are classified into N modulation scheme sets, each modulation scheme set comprises K adjacent modulation schemes, the N modulation scheme sets comprise a first modulation scheme set, the K adjacent modulation schemes in the first modulation scheme set comprise the Q modulation schemes, and Q is less than or equal to K. ### Claim 6 (depends on 1) The method according to claim 1, wherein the first indication information further indicates a coding rate corresponding to the Q modulation schemes. ### Claim 7 (depends on 1) The method according to claim 1, wherein the first indication information further indicates a spatial stream corresponding to each of the Q modulation schemes. ### Claim 8 (depends on 7) The method according to claim 7, wherein the first indication information comprises a modulation and coding scheme (MCS) index, and the MCS index indicates at least one of the coding rate or the spatial streams corresponding to the Q modulation schemes. ### Claim 9 (depends on 1) The method according to claim 1, wherein the first indication information comprises T bits, and a value of the T bits is a modulation and coding scheme (MCS) index; and the MCS index indicates the first modulation scheme set and a coding rate corresponding to the first modulation scheme set; or the MCS index indicates one modulation scheme in the first modulation scheme set and the coding rate corresponding to the first modulation scheme set. ### Claim 10 (depends on 9) The method according to claim 9, wherein that the MCS index indicates the one modulation scheme in the first modulation scheme set comprises: K=2, and the MCS index indicates a highest-order modulation scheme in the first modulation scheme set or a lowest-order modulation scheme in the first modulation scheme set; or K=3, and the MCS index indicates a highest-order modulation scheme in the first modulation scheme set, or an intermediate-order modulation scheme in the first modulation scheme set, or a lowest-order modulation scheme in the first modulation scheme set; or K=4, and the MCS index indicates a highest-order modulation scheme in the first modulation scheme set, or a second-highest-order modulation scheme in the first modulation scheme set, or a third-highest-order modulation scheme in the first modulation scheme set, or a lowest-order modulation scheme in the first modulation scheme set. ### Claim 11 (depends on 9) The method according to claim 9, wherein the first indication information further indicates an index of a spatial stream corresponding to a modulation scheme in the first modulation scheme set. ### Claim 12 (depends on 11) The method according to claim 11, wherein the first indication information further comprises K spatial stream indication fields, the K spatial stream indication fields comprise a first spatial stream indication field, the first spatial stream indication field indicates an index of a spatial stream corresponding to a first modulation scheme, and the first modulation scheme is one of the K adjacent modulation schemes. ### Claim 13 (depends on 12) The method according to claim 12, wherein a value carried in the first spatial stream indication field is Si, Si represents a maximum index of the spatial stream corresponding to the first modulation scheme, Si is an integer greater than or equal to 0 and less than or equal to Nss−1, Nss is a total number of spatial streams, and i is an integer greater than or equal to 0 and less than or equal to K−1; and the index of the spatial stream corresponding to the first modulation scheme is less than or equal to Si; or the index of the spatial stream corresponding to the first modulation scheme is greater than Si-1 and less than or equal to Si, Si-1 is a value carried in a second spatial stream indication field, and Si-1 is less than or equal to Si. ### Claim 14 (depends on 9) The method according to claim 9, wherein the first indication information further indicates a number of spatial streams corresponding to a modulation scheme in the first modulation scheme set. ### Claim 15 (depends on 14) The method according to claim 14, wherein the first indication information further comprises K spatial stream indication fields, the K spatial stream indication fields comprise a first spatial stream indication field, the first spatial stream indication field indicates a number of spatial streams of a first modulation scheme, and the first modulation scheme is one of the K adjacent modulation schemes. ### Claim 16 (depends on 15) The method according to claim 15, wherein a value carried in the first spatial stream indication field is Si, Si represents the number of spatial streams corresponding to the first modulation scheme, Si is an integer greater than or equal to 0 and less than or equal to Nss−1, Nss is a total number of spatial streams, and i is an integer greater than or equal to 0 and less than or equal to K−1. ### Claim 17 (depends on 11) The method according to claim 11, wherein the first indication information further comprises information about Nss and K−1 spatial stream indication fields, the K−1 spatial stream indication fields comprise a first spatial stream indication field, the first spatial stream indication field indicates an index of a spatial stream of a first modulation scheme, the first modulation scheme is one of the K adjacent modulation schemes other than a lowest-order modulation scheme, and Nss represents a total number of spatial streams. ### Claim 18 A communication method, wherein the method comprises: receiving, by a second communication apparatus, a physical protocol data unit (PPDU), wherein the PPDU comprises first indication information indicating Q modulation schemes in W modulation schemes, a difference between numbers of modulation bits of modulation symbols of any two modulation schemes in the Q modulation schemes is less than a first value, the W modulation schemes comprise at least one of the following: 4096 quadrature amplitude modulation (QAM), 1024QAM, 256QAM, and binary phase shift keying-dual carrier modulation (BPSK-DCM), and Q is a positive integer less than W; and parsing, by the second communication apparatus, the PPDU. ### Claim 19 A communication apparatus, comprising a processor and a memory, wherein the processor invokes code or an instruction in the memory to perform: generating a physical protocol data unit (PPDU), wherein the PPDU comprises first indication information indicating Q modulation schemes in W modulation schemes, a difference between numbers of modulation bits of modulation symbols of any two modulation schemes in the Q modulation schemes is less than a first value, the W modulation schemes comprise at least one of the following: 4096 quadrature amplitude modulation (QAM), 1024QAM, 256QAM, and binary phase shift keying-dual carrier modulation (BPSK-DCM), and Q is a positive integer less than W; and sending the PPDU. ### Claim 20 A communication apparatus, comprising a processor and a memory, wherein the processor invokes code or an instruction in the memory to perform: receiving a physical protocol data unit (PPDU), wherein the PPDU comprises first indication information indicating Q modulation schemes in W modulation schemes, a difference between numbers of modulation bits of modulation symbols of any two modulation schemes in the Q modulation schemes is less than a first value, the W modulation schemes comprise at least one of the following: 4096 quadrature amplitude modulation (QAM), 1024QAM, 256QAM, and binary phase shift keying-dual carrier modulation (BPSK-DCM), and Q is a positive integer less than W; and parsing the PPDU.