# US 12,593,237 B2 · Physical layer preamble design for special packet types > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,593,237 B2 - Document ID: US12593237B2 - Status: Granted - Kind: B2 - Application number: 18/463,197 - Filed: 2023-09-07 - Published: 2023-12-28 - Granted: 2026-03-31 - Earliest claimed: 2019-10-25 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Jialing Li Chen; Sameer Vermani; Bin Tian; Lin Yang - Web page: https://patentgrep.com/patent/US12593237B2 ## CPC - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 28/0231: {based on communication conditions (dynamic wireless traffic scheduling definition based on channel quality criteria H04W72/54)} - 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 5/0094: {Indication of how sub-channels of the path are allocated} - H04L 27/2603: {Signal structure ensuring backward compatibility with legacy system} - H04W 28/06: Optimizing {the usage of the radio link}, e.g. header compression, information sizing {, discarding information (system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365)} - H04B 7/0452: Multi-user MIMO systems - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0035: {Resource allocation in a cooperative multipoint environment} - H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH} - 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) - H04B: TRANSMISSION ## Abstract This disclosure provides methods, devices and systems for generating packet preambles. Some implementations more specifically relate to preamble designs for special cases such as, for example, full-bandwidth multi-user multiple-input multiple-output (MU-MIMO), single-user (SU) preamble puncturing, hybrid automatic repeat request (HARQ), and multi-AP coordination. Multi-AP coordination may refer to coordinated beamforming (CoBF), joint transmission (JT), or coordinated orthogonal frequency division multiple access (C-OFDMA). Additionally, or alternatively, some implementations more specifically relate to preamble designs that accommodate signal fields of different cases. ## Claims ### Claim 1 A method of wireless communication by a first wireless access point (AP), comprising: generating a first portion of a first physical layer protocol data unit (PPDU) in accordance with a second PPDU to be transmitted by a second wireless AP, the first portion including at least a legacy signal field (L-SIG), a repeat of the L-SIG (RL-SIG) that immediately follows the L-SIG and a universal signal field (U-SIG) that immediately follows the RL-SIG and carries information for interpreting one or more subsequent fields of a second portion, the U-SIG including BSS color information to identify a multi-AP group, the second portion of the first PPDU including at least a short training field, a long training field, and a data field; and transmitting the first PPDU to a first receiving device, concurrently with transmission of the second PPDU by the second wireless AP, wherein the first and second PPDUs are transmitted as multi-AP transmissions coordinated between at least the first and the second APs, and wherein a beamformed portion of the first PPDU does not include the first portion of the first PPDU. ### Claim 2 (depends on 1) The method of claim 1, wherein the first and second PPDUs are transmitted by the first and second wireless APs, the first and second wireless APs belonging to first and second basic service sets (BSSs), respectively. ### Claim 3 (depends on 2) The method of claim 2, wherein the first and second PPDUs are transmitted as coordinated beamforming (CoBF) transmissions and wherein the first receiving device belongs to the first BSS and the second PPDU is transmitted to a second receiving device belonging to the second BSS, wherein at least a portion of each of the first and second PPDUs is transmitted using beamforming, a beamformed portion of the first PPDU being protected from overlapping BSS (OBSS) interference through nulling of the interference by a beamformed portion of the second PPDU. ### Claim 4 (depends on 2) The method of claim 2, wherein the information in the U-SIG is common to the first and second BSSs, and wherein the information common to all BSSs includes the BSS color information. ### Claim 5 (depends on 4) The method of claim 4, further comprising: transmitting a setup PPDU to the first receiving device prior to the transmission of the first PPDU, the setup PPDU carrying user specific information for the first receiving device. ### Claim 6 (depends on 3) The method of claim 3, wherein the first PPDU functions as a single BSS PPDU without OBSS interference in the beamformed portion of the first PPDU. ### Claim 7 (depends on 3) The method of claim 3, wherein beamforming is only performed on the second portion of the first PPDU, and wherein the first portion of the first PPDU is transmitted omnidirectionally. ### Claim 8 (depends on 1) The method of claim 1, wherein the transmission of the first PPDU is synchronized in time and frequency with the transmission of the second PPDU. ### Claim 9 (depends on 1) The method of claim 1, wherein the first PPDU and the second PPDU have a same LTF symbol duration, and a same guard interval duration. ### Claim 10 (depends on 1) The method of claim 1, further comprising: transmitting a trigger frame, prior to the transmission of the first PPDU, to indicate to other wireless communication devices not to interfere with the transmission of the first PPDU, wherein the trigger frame comprises a request to send (RTS) frame or a clear to send (CTS)-to-self frame. ### Claim 11 (depends on 1) The method of claim 1, wherein the first portion of the first PPDU is identical to a first portion of the second PPDU. ### Claim 12 (depends on 1) The method of claim 1, wherein the first and second PPDUs are transmitted as joint transmissions by the first and second wireless communication devices, and wherein the second PPDU is also transmitted to the first receiving device. ### Claim 13 (depends on 12) The method of claim 12, further comprising: transmitting synchronization information to the second wireless communication device during one or more gaps in the transmission of the first PPDU, wherein the one or more gaps are periodically repeated over a duration of the transmission of the first PPDU. ### Claim 14 (depends on 1) The method of claim 1, wherein the first wireless AP comprises a primary AP and the second wireless AP comprises a secondary AP. ### Claim 15 (depends on 1) The method of claim 1, wherein at least a portion of each of the first and second PPDUs is transmitted using beamforming and wherein the beamformed portion of the first PPDU includes the first portion of the first PPDU. ### Claim 16 (depends on 1) The method of claim 1, wherein the first and second PPDUs are transmitted as coordinated spatial reuse (CoSR) transmissions. ### Claim 17 An apparatus for wireless communication by a first wireless access point (AP), comprising: a processing system that includes one or more processors and one or more memories coupled with the one or more processors, the processing system configured to cause the apparatus to: generate a first portion of a first physical layer protocol data unit (PPDU) in accordance with a second PPDU to be transmitted by a second wireless AP, the first portion including at least a legacy signal field (L-SIG), a repeat of the L-SIG (RL-SIG) that immediately follows the L-SIG and a universal signal field (U-SIG) that immediately follows the RL-SIG and carries information for interpreting one or more subsequent fields of a second portion, the U-SIG including BSS color information to identify a multi-AP group, the second portion of the first PPDU including at least a short training field, a long training field, and a data field; and transmit the first PPDU, to a first receiving device, concurrently with transmission of the second PPDU by the second wireless AP, wherein the first and second PPDUs are transmitted as multi-AP transmissions coordinated between at least the first and the second APs, and wherein a beamformed portion of the first PPDU does not include the first portion of the first PPDU. ### Claim 18 (depends on 17) The apparatus of claim 17, wherein the first and second PPDUs are transmitted as coordinated beamforming (CoBF) transmissions and wherein the first receiving device belongs to the first BSS and the second PPDU is transmitted to a second receiving device belonging to the second BSS, wherein at least a portion of each of the first and second PPDUs is transmitted using beamforming, a beamformed portion of the first PPDU being protected from overlapping BSS (OBSS) interference through nulling of the interference by a beamformed portion of the second PPDU. ### Claim 19 (depends on 17) The apparatus of claim 17, wherein the first and second PPDUs are transmitted as joint transmissions by the first and second wireless APs, and wherein the second PPDU is also transmitted to the first receiving device.