# US 12,603,723 B2 · Communication device, information processing device, communication method, and computer-readable storage medium > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,603,723 B2 - Document ID: US12603723B2 - Status: Granted - Kind: B2 - Application number: 18/664,459 - Filed: 2024-05-15 - Published: 2024-09-05 - Granted: 2026-04-14 - Earliest claimed: 2019-02-28 - Assignees: Canon Kabushiki Kaisha - Applicants: Canon Kabushiki Kaisha - Inventors: Hirohiko Inohiza - Web page: https://patentgrep.com/patent/US12603723B2 ## CPC - H04L 1/0003: {by switching between different modulation schemes} - H04L 27/2602: {Signal structure} - H04L 1/0013: {Rate matching, e.g. puncturing or repetition of code symbols} - H04L 1/0025: {Transmission of mode-switching indication} - H04L 1/0083: {Formatting with frames or packets; Protocol or part of protocol for error control} - 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 27/34: Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems - H04W 28/18: Negotiating wireless communication parameters - H04W 84/12: WLAN [Wireless Local Area Networks] - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A communication device transmits a radio frame including a preamble and a data field of a physical (PHY) layer. The preamble includes an L-STF, an L-LTF, an L-SIG, an EHT-SIG-A, an EHT-STF, and an EHT-LTF, the EHT-SIG-A includes a subfield indicating information of a modulation scheme and a code rate (MCS, Modulation and Coding Scheme), the data field includes data modulated and encoded in accordance with the modulation scheme and the code rate indicated by the subfield, and the subfield is configured to be capable of designating one of at least 2048 QAM and 4096 QAM as the modulation scheme. ## Claims ### Claim 1 A communication device, comprising: at least one memory that stores a set of instructions; and at least one processing circuit, wherein the communication device is caused, by the at least one processing circuit executing the instructions and/or the at least one processing circuit itself operating, to perform operations comprising: transmitting a radio frame including a preamble of a physical (PHY) layer and a data field, wherein the preamble includes a first SIG (Signal Field) and a second SIG, the second SIG is transmitted right after a transmission of the first SIG, the first SIG includes a first subfield indicating information of a modulation scheme and a coding rate (MCS, Modulation and Coding Scheme) of the second SIG, the MCS of the second SIG being used for modulation and coding of information used by a plurality of partner devices in common, the first subfield does not designate any MCS of which a data rate is greater than a data rate of a MCS that is 64QAM modulation and 1/2 coding rate, and the first subfield is configured to be capable of designating a MCS from at least BPSK and 1/2 coding rate, QPSK and 1/2 coding rate, 16 QAM and 1/2 coding rate, the second SIG includes a second subfield indicating information of a MCS of the data field, the data field includes data modulated and encoded in accordance with the information of the MCS indicated by the second subfield, and the second subfield is configured to be capable of designating a MCS from at least BPSK and 1/2 coding rate, QPSK and 1/2 coding rate, 16 QAM and 1/2 coding rate, and 4096QAM and 3/4 coding rate. ### Claim 2 (depends on 1) The communication device according to claim 1, wherein the operations further comprises identifying, based on a communication quality between the communication device and a partner device and an address to which the radio frame is transmitted, a value to be set in the second sub field, wherein the second SIG includes a plurality of User fields each of which corresponds to a respective address of the radio frame and each of the plurality of the User field includes the second field and STA-ID corresponding to the respective address. ### Claim 3 (depends on 1) The communication device according to claim 1, wherein the operations further comprises setting, in accordance with a user operation, the MCS used for a data communication. ### Claim 4 (depends on 1) The communication device according to claim 1, wherein the first subfield consists of a first number of bits, the second subfield consists of a second number of bits, and the second number is greater than the first number. ### Claim 5 (depends on 1) The communication device according to claim 1, wherein the communication device is a printing device. ### Claim 6 (depends on 1) The communication device according to claim 1, wherein the communication device is a camera device. ### Claim 7 (depends on 1) The communication device according to claim 1, further comprising a projector that performs a projection. ### Claim 8 (depends on 1) The communication device according to claim 1, wherein the second subfield is further configured to be capable of designating a MCS of 4096 QAM and 5/6 coding rate. ### Claim 9 (depends on 1) The communication device according to claim 1, wherein the second subfield is configured to be capable of designating a MCS from at least 17 classes of MCSs. ### Claim 10 (depends on 1) The communication device according to claim 1, wherein the second subfield consists of 5 bits. ### Claim 11 (depends on 1) The communication device according to claim 1, wherein the communication device is a communication device complying with IEEE 802.11 standard series. ### Claim 12 A communication device, comprising: at least one memory that stores a set of instructions; and at least one processing circuit, wherein the communication device is caused, by the at least one processing circuit executing the instructions and/or the at least one processing circuit itself operating, to perform operations comprising: receiving a radio frame including a preamble of a physical (PHY) layer and a data field, wherein the preamble includes a first SIG (Signal Field) and a second SIG, the second SIG is received right after a receiving of the first SIG, the first SIG includes a first subfield indicating information of a modulation scheme and a coding rate (MCS, Modulation and Coding Scheme) of the second SIG, the MCS of the second SIG being used for modulation and coding of information commonly used by a plurality of communication devices including the communication device, the first subfield does not designate any MCS of which a data rate is greater than a data rate of a MCS that is 64QAM modulation and 1/2 coding rate, and the first subfield is configured to be capable of designating a MCS from at least BPSK and 1/2 coding rate, QPSK and 1/2 coding rate, 16 QAM and 1/2 coding rate, the second SIG includes a second subfield indicating information of a MCS of the data field, the data field includes data modulated and encoded in accordance with the information of the MCS indicated by the second subfield, and the second subfield is configured to be capable of designating a MCS from at least BPSK and 1/2 coding rate, QPSK and 1/2 coding rate, 16 QAM and 1/2 coding rate, and 4096QAM and 3/4 coding rate. ### Claim 13 (depends on 12) The communication device according to claim 12, wherein the first subfield consists of a first number of bits, the second subfield consists of a second number of bits, and the second number is greater than the first number. ### Claim 14 (depends on 12) The communication device according to claim 12, wherein the communication device is a printing device. ### Claim 15 (depends on 12) The communication device according to claim 12, wherein the communication device is a camera device. ### Claim 16 (depends on 12) The communication device according to claim 12, further comprising a projector that performs a projection. ### Claim 17 (depends on 12) The communication device according to claim 12, wherein the second subfield is further configured to be capable of designating a MCS of 4096 QAM and 5/6 coding rate. ### Claim 18 (depends on 12) The communication device according to claim 12, wherein the second subfield is configured to be capable of designating a MCS from at least 17 classes of MCSs. ### Claim 19 (depends on 12) The communication device according to claim 12, wherein the second subfield consists of 5 bits. ### Claim 20 (depends on 12) The communication device according to claim 12, wherein the communication device is a communication device complying with IEEE 802.11 standard series. ### Claim 21 An information processing apparatus, comprising: at least one memory that stores a set of instructions; and at least one processing circuit, wherein the information processing apparatus is caused, by the at least one processing circuit executing the instructions and/or the at least one processing circuit itself operating, to perform operations comprising: generating a radio frame including a preamble of a physical (PHY) layer and a data field, wherein the preamble includes a first SIG (Signal Field) and a second SIG, the second SIG is transmitted right after a transmission of the first SIG, the first SIG includes a first subfield indicating information of a modulation scheme and a coding rate (MCS, Modulation and Coding Scheme) of the second SIG, the MCS of the second SIG being used for modulation and coding of information used by a plurality of partner devices in common, the first subfield does not designate any MCS of which a data rate is greater than a data rate of a MCS that is 64QAM modulation and 1/2 coding rate, and the first subfield is configured to be capable of designating a MCS from at least BPSK and 1/2 coding rate, QPSK and 1/2 coding rate, 16 QAM and 1/2 coding rate, the second SIG includes a second subfield indicating information of a MCS of the data field, the data field includes data modulated and encoded in accordance with the information of the MCS indicated by the second subfield, and the second subfield is configured to be capable of designating a MCS from at least BPSK and 1/2 coding rate, QPSK and 1/2 coding rate, 16 QAM and 1/2 coding rate, and 4096QAM and 3/4 coding rate. ### Claim 22 A communication method, comprising: transmitting a radio frame including a preamble of a physical (PHY) layer and a data field, wherein the preamble includes a first SIG (Signal Field) and a second SIG, the second SIG is transmitted right after a transmission of the first SIG, the first SIG includes a first subfield indicating information of a modulation scheme and a coding rate (MCS, Modulation and Coding Scheme) of the second SIG, the MCS of the second SIG being used for modulation and coding of information used by a plurality of partner devices in common, the first subfield does not designate any MCS of which a data rate is greater than a data rate of a MCS that is 64QAM modulation and 1/2 coding rate, and the first subfield is configured to be capable of designating a MCS from at least BPSK and 1/2 coding rate, QPSK and 1/2 coding rate, 16 QAM and 1/2 coding rate, the second SIG includes a second subfield indicating information of a MCS of the data field, the data field includes data modulated and encoded in accordance with the information of the MCS indicated by the second subfield, and the second subfield is configured to be capable of designating a MCS from at least BPSK and 1/2 coding rate, QPSK and 1/2 coding rate, 16 QAM and 1/2 coding rate, and 4096QAM and 3/4 coding rate. ### Claim 23 A communication method, comprising: receiving a radio frame including a preamble of a physical (PHY) layer and a data field, wherein the preamble includes a first SIG (Signal Field) and a second SIG, the second SIG is received right after a receiving of the first SIG, the first SIG includes a first subfield indicating information of a modulation scheme and a coding rate (MCS, Modulation and Coding Scheme) of the second SIG, the MCS of the second SIG being used for modulation and coding of information commonly used by a plurality of communication devices, the first subfield does not designate any MCS of which a data rate is greater than a data rate of a MCS that is 64QAM modulation and 1/2 coding rate, and the first subfield is configured to be capable of designating a MCS from at least BPSK and 1/2 coding rate, QPSK and 1/2 coding rate, 16 QAM and 1/2 coding rate, the second SIG includes a second subfield indicating information of a MCS of the data field, the data field includes data modulated and encoded in accordance with the information of the MCS indicated by the second subfield, and the second subfield is configured to be capable of designating a MCS from at least BPSK and 1/2 coding rate, QPSK and 1/2 coding rate, 16 QAM and 1/2 coding rate, and 4096QAM and 3/4 coding rate. ### Claim 24 (depends on 23) The communication method according to claim 23, wherein the first subfield consists of a first number of bits, the second subfield consists of a second number of bits, and the second number is greater than the first number. ### Claim 25 A non-transitory computer readable storage medium storing instructions executed by at least one circuit to cause a communication device to perform: transmitting a radio frame including a preamble of a physical (PHY) layer and a data field, wherein the preamble includes a first SIG (Signal Field) and a second SIG, the second SIG is transmitted right after a transmission of the first SIG, the first SIG includes a first subfield indicating information of a modulation scheme and a coding rate (MCS, Modulation and Coding Scheme) of the second SIG, the MCS of the second SIG being used for modulation and coding of information used by a plurality of partner devices in common, the first subfield does not designate any MCS of which a data rate is greater than a data rate of a MCS that is 64QAM modulation and 1/2 coding rate, and the first subfield is configured to be capable of designating a MCS from at least BPSK and 1/2 coding rate, QPSK and 1/2 coding rate, 16 QAM and 1/2 coding rate, the second SIG includes a second subfield indicating information of a MCS of the data field, the data field includes data modulated and encoded in accordance with the information of the MCS indicated by the second subfield, and the second subfield is configured to be capable of designating a MCS from at least BPSK and 1/2 coding rate, QPSK and 1/2 coding rate, 16 QAM and 1/2 coding rate, and 4096QAM and 3/4 coding rate. ### Claim 26 A non-transitory computer readable storage medium storing instructions executed by at least one circuit to cause a communication device to perform: receiving a radio frame including a preamble of a physical (PHY) layer and a data field, wherein the preamble includes a first SIG (Signal Field) and a second SIG, the second SIG is received right after a receiving of the first SIG, the first SIG includes a first subfield indicating information of a modulation scheme and a coding rate (MCS, Modulation and Coding Scheme) of the second SIG, the MCS of the second SIG being used for modulation and coding of information commonly used by a plurality of communication devices including the communication device, the first subfield does not designate any MCS of which a data rate is greater than a data rate of a MCS that is 64QAM modulation and 1/2 coding rate, and the first subfield is configured to be capable of designating a MCS from at least BPSK and 1/2 coding rate, QPSK and 1/2 coding rate, 16 QAM and 1/2 coding rate, the second SIG includes a second subfield indicating information of a MCS of the data field, the data field includes data modulated and encoded in accordance with the information of the MCS indicated by the second subfield, and the second subfield is configured to be capable of designating a MCS from at least BPSK and 1/2 coding rate, QPSK and 1/2 coding rate, 16 QAM and 1/2 coding rate, and 4096QAM and 3/4 coding rate.