# US 12,191,998 B2 · Method for constructing preamble in wireless communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,191,998 B2 - Document ID: US12191998B2 - Status: Granted - Kind: B2 - Application number: 18/386,510 - Filed: 2023-11-02 - Published: 2024-02-22 - Granted: 2025-01-07 - Earliest claimed: 2019-11-09 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Dongguk Lim; Jinyoung Chun; Jinsoo Choi; Eunsung Park; Jinmin Kim - Web page: https://patentgrep.com/patent/US12191998B2 ## CPC - H04L 1/0063: {Single parity check} - H04L 1/0075: {Transmission of coding parameters to receiver (H04L1/0023 takes precedence)} - H04B 7/0452: Multi-user MIMO systems - H04L 1/0008: {by supplementing frame payload, e.g. with padding bits} - H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH} - H04L 27/2603: {Signal structure ensuring backward compatibility with legacy system} - H04W 80/02: Data link layer protocols - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 27/2666: {Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length} - 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) - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract One embodiment according to the present specification relates to a method for constructing a preamble in a wireless LAN (WLAN) system. According to various embodiments, a PPDU may comprise a first signal field and a second signal field. The first signal field may include first information about PHY version. The first information may be determined on the basis of whether the PPDU is an EHT PPDU. The second signal field may include second information about the transmission of the PPDU, which is set on the basis of the first information. ## Claims ### Claim 1 A method performed by a receiving station (STA) in a wireless local area network (WLAN) system, the method comprising: receiving a Physical Layer Protocol Data Unit (PPDU), wherein the PPDU includes a universal signal (U-SIG) field and an extremely high throughput signal (EHT-SIG) field, wherein the U-SIG field has a length of two symbols, wherein the U-SIG field includes first information related to a Physical layer (PHY) version of the PPDU, and the first information has a length of 3 bits, wherein the first information indicates whether the PPDU is an extremely high throughput (EHT) PPDU, wherein the U-SIG field further includes second information related to whether the PPDU is related to a single user (SU) transmission, wherein based on the PPDU being related to the SU transmission and the bandwidth of the PPDU being greater than 20 MHz, the EHT-SIG field has a single content channel which is duplicated in every 20 MHz subchannel, wherein the single content channel includes a common field and a user specific field; and decoding the PPDU based on the U-SIG field and the EHT-SIG field. ### Claim 2 (depends on 1) The method of claim 1, wherein the single content channel includes overflow information overflowed from the U-SIG field. ### Claim 3 (depends on 1) The method of claim 1, wherein the single content channel includes at least one of: information related to a size of a long training field (LTF); information related to a number of symbols of the LTF; information related to a Low Density Parity Check Code (LDPC) extra symbol; information related to a pre-forward error correction (FEC) padding factor; and information related to a packet extension (PE). ### Claim 4 (depends on 1) The method of claim 1, wherein the common field further includes information related to resource unit (RU) allocation. ### Claim 5 (depends on 1) The method of claim 1, wherein the common field includes first cyclic redundancy check (CRC) bits and first tail bits, wherein the user specific field includes second CRC bits and second tail bits. ### Claim 6 (depends on 1) The method of claim 1, wherein the user specific field is configured based on whether Orthogonal Frequency Division Multiplexing Access (OFDMA) or Multi User-Multiple Input Multiple Output (MU-MIMO) is applied. ### Claim 7 (depends on 1) The method of claim 1, wherein the PPDU further includes an L-SIG field and an RL-SIG field, wherein a result of ‘modulo 3’ operation for a length field value of the L-SIG field is set to zero (0), wherein the RL-SIG field is a repeat of the L-SIG field. ### Claim 8 A method performed by a transmitting station (STA) in a wireless local area network (WLAN) system, the method comprising: generating a Physical Layer Protocol Data Unit (PPDU), wherein the PPDU includes a universal signal (U-SIG) field and an extremely high throughput signal (EHT-SIG) field, wherein the U-SIG field has a length of two symbols, wherein the U-SIG field includes first information related to a Physical layer (PHY) version of the PPDU, and the first information has a length of 3 bits, wherein the first information indicates on whether the PPDU is an extremely high throughput (EHT) PPDU, wherein the U-SIG field further includes second information related to whether the PPDU is related to a single user (SU) transmission, wherein based on the PPDU being related to the SU transmission and the bandwidth of the PPDU being greater than 20 MHz, the EHT-SIG field has a single content channel which is duplicated in every 20 MHz subchannel, wherein the single content channel includes a common field and a user specific field; and transmitting the PPDU. ### Claim 9 (depends on 8) The method of claim 8, wherein the single content channel includes overflow information overflowed from the U-SIG field. ### Claim 10 (depends on 8) The method of claim 8, wherein the single content channel includes at least one of: information related to a size of a long training field (LTF); information related to a number of symbols of the LTF; information related to a Low Density Parity Check Code (LDPC) extra symbol; information related to a pre-forward error correction (FEC) padding factor; and information related to a packet extension (PE). ### Claim 11 (depends on 8) The method of claim 8, wherein the common field further includes information related to resource unit (RU) allocation. ### Claim 12 (depends on 8) The method of claim 8, wherein the common field includes first cyclic redundancy check (CRC) bits and first tail bits, wherein the user specific field includes second CRC bits and second tail bits. ### Claim 13 (depends on 8) The method of claim 8, wherein the user specific field is configured based on whether Orthogonal Frequency Division Multiplexing Access (OFDMA) or Multi User-Multiple Input Multiple Output (MU-MIMO) is applied. ### Claim 14 (depends on 8) The method of claim 8, wherein the PPDU further includes an L-SIG field and an RL-SIG field, wherein a result of ‘modulo 3’ operation for a length field value of the L-SIG field is set to zero (0), wherein the RL-SIG field is a repeat of the L-SIG field. ### Claim 15 A transmitting station (STA) in a wireless local area network (WLAN) system, comprising: a transceiver transmitting a wireless signal; and a processor coupled to the transceiver, wherein processor is adapted to: generate a Physical Layer Protocol Data Unit (PPDU), wherein the PPDU includes a universal signal (U-SIG) field and an extremely high throughput signal (EHT-SIG) field, wherein the U-SIG field has a length of two symbols, wherein the U-SIG field includes first information related to a Physical layer (PHY) version of the PPDU, and the first information has a length of 3 bits, wherein the first information indicates based on whether the PPDU is an extremely high throughput (EHT) PPDU, wherein the U-SIG field further includes second information related to whether the PPDU is related to a single user (SU) transmission, wherein based on the PPDU being related to the SU transmission and the bandwidth of the PPDU being greater than 20 MHz, the EHT-SIG field has a single content channel which is duplicated in every 20 MHz subchannel, wherein the single content channel includes a common field and a user specific field; and transmit the PPDU. ### Claim 16 (depends on 15) The STA of claim 15, wherein the single content channel includes overflow information overflowed from the U-SIG field. ### Claim 17 (depends on 15) The STA of claim 15, wherein the single content channel includes at least one of: information related to a size of a long training field (LTF); information related to a number of symbols of the LTF; information related to a Low Density Parity Check Code (LDPC) extra symbol; information related to a pre-forward error correction (FEC) padding factor; and information related to a packet extension (PE). ### Claim 18 (depends on 15) The STA of claim 15, wherein the common field further includes information related to resource unit (RU) allocation. ### Claim 19 (depends on 15) The STA of claim 15, wherein the common field includes first cyclic redundancy check (CRC) bits and first tail bits, wherein the user specific field includes second CRC bits and second tail bits. ### Claim 20 (depends on 15) The STA of claim 15, wherein the user specific field is configured based on whether Orthogonal Frequency Division Multiplexing Access (OFDMA) or Multi User-Multiple Input Multiple Output (MU-MIMO) is applied.