# US 2025/0158748 A1 · Negative acknowledgment mechanisms > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0158748 A1 - Document ID: US20250158748A1 - Status: Published application - Kind: A1 - Application number: 18/506,996 - Filed: 2023-11-10 - Published: 2025-05-15 - Earliest claimed: 2023-11-10 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Alfred ASTERJADHI; Abhishek Pramod PATIL; George CHERIAN; Gaurang NAIK; Sai Yiu Duncan HO - Web page: https://patentgrep.com/patent/US20250158748A1 ## CPC - H04L 1/1607: Details of the supervisory signal - H04L 1/1896: {ARQ related signaling} - H04L 1/1671: {the supervisory signal being transmitted together with control information} - H04L 1/1854: {Scheduling and prioritising arrangements} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract This disclosure provides methods, components, devices and systems that may help various wireless devices negatively acknowledge certain wireless transmissions. An example method, performed at a first wireless node, generally includes obtaining information indicating transmission, from a second wireless node, of a physical layer (PHY) protocol data unit (PPDU) intended for the first wireless node, generating a frame indicating negative acknowledgment of at least a portion of the PPDU if one or more conditions are met, and outputting the frame to the second wireless node. ## Claims ### Claim 1 An apparatus for wireless communication, comprising: at least one memory comprising computer-executable instructions; and one or more processors configured to execute the computer-executable instructions and cause the apparatus to: obtain, at a first wireless node, information indicating transmission, from a second wireless node, of a physical layer (PHY) protocol data unit (PPDU) intended for the first wireless node; generate a frame indicating negative acknowledgment of at least a portion of the PPDU if one or more conditions are met; and output the frame to the second wireless node. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein at least one of the one or more conditions is considered met only if the first wireless node fails to decode a Physical layer convergence protocol (PLCP) Service Data Unit (PSDU) of the PPDU. ### Claim 3 (depends on 1) The apparatus of claim 1, wherein the information is obtained from at least one of: a physical (PHY) header of the PPDU; or a previous frame obtained from the second wireless node. ### Claim 4 (depends on 3) The apparatus of claim 3, wherein the information comprises at least one of: a basic service set (BSS) color value; a value of a flag indicating a direction type of the PPDU; a receiver identifier; or a transmitter identifier. ### Claim 5 (depends on 4) The apparatus of claim 4, wherein at least one of the receiver identifier or the transmitter identifier comprises a medium access control (MAC) address, an association identifier, or an identifier that is derived from the MAC address or the association identifier. ### Claim 6 (depends on 4) The apparatus of claim 4, wherein at least one of the one or more conditions is considered met if the BSS color value indicates the first wireless node and second wireless node belong to the same BSS or multiple BSSID set. ### Claim 7 (depends on 4) The apparatus of claim 4, wherein at least one of one or more conditions is considered met if: the value of the flag indicates an uplink direction if the first wireless node is an access point (AP); and the transmitter identifier indicates the second wireless node is associated with the AP. ### Claim 8 (depends on 4) The apparatus of claim 4, wherein at least one of the one or more conditions is considered met if: the value of the flag indicates a downlink direction if the first wireless node is a station (STA) or a peer-to-peer direction if the first wireless node is a STA; and the receiver identifier indicates the PPDU is intended for the STA. ### Claim 9 (depends on 1) The apparatus of claim 1, wherein at least one of the one or more conditions is considered met only if the first wireless node decodes at least a portion of a physical (PHY) header of the PPDU. ### Claim 10 (depends on 9) The apparatus of claim 9, wherein the at least one of the one or more conditions is considered met if the PPDU indicates a response is expected via: a bit in the PHY header of the PPDU; or a value of a transmit opportunity (TXOP) field in the PHY header. ### Claim 11 (depends on 10) The apparatus of claim 10, wherein the PPDU indicates the response is expected at, in, or during a short interframe space (SIFS) after an end of the PPDU. ### Claim 12 (depends on 1) The apparatus of claim 1, wherein the frame comprises a block acknowledgment (BA) frame, a trigger frame, or a clear to send (CTS) frame. ### Claim 13 (depends on 12) The apparatus of claim 12, wherein the BA frame has a BA information field set to a value that indicates a negative acknowledgment of the PPDU. ### Claim 14 (depends on 12) The apparatus of claim 12, wherein the BA frame has at least one of: at least one association ID (AID) traffic ID (TID) information field set to a value that indicates a negative acknowledgment of the PPDU; or at least one AID TID information field with a BA bitmap subfield set to a value that indicates a negative acknowledgment of the PPDU. ### Claim 15 (depends on 12) The apparatus of claim 12, wherein the trigger frame: comprises a basic trigger frame or a multi-user (MU) request to send (RTS) trigger frame; and includes a set of transmit parameters for the second wireless node to use when retransmitting MAC Protocol Data Units (MPDUs) that were contained in the PPDU and a duration time within which retransmitted PPDUs should be sent. ### Claim 16 (depends on 12) The apparatus of claim 12, wherein the trigger frame is designed to trigger transmissions from one or more other wireless devices along with the first wireless node. ### Claim 17 (depends on 1) The apparatus of claim 1, wherein the frame includes a set of transmit parameters for the second wireless node to use when retransmitting MAC Protocol Data Units (MPDUs) that were contained in the PPDU. ### Claim 18 (depends on 17) The apparatus of claim 17, wherein the transmit parameters include at least one of: a modulation and coding scheme (MCS), a number of spatial streams (NSS), a bandwidth (BW), a transmit power, a preamble puncture pattern, a PPDU type, a guard interval, a type of encoding, or a spatial reuse allowance. ### Claim 19 (depends on 1) The apparatus of claim 1, wherein the frame includes a duration field that indicates a duration that is based on: a duration indicated in a transmit opportunity (TXOP) field in a physical (PHY) header of the PPDU; a duration of a short interframe space (SIFS); and a duration of the frame. ### Claim 20 (depends on 1) The apparatus of claim 1, further comprising at least one transceiver configured to receive the information and transmit the frame, wherein the apparatus is configured as a wireless station. ### Claim 21 An apparatus for wireless communication, comprising: at least one memory comprising computer-executable instructions; and one or more processors configured to execute the computer-executable instructions and cause the apparatus to: output, at a second wireless node, a physical layer (PHY) protocol data unit (PPDU) intended for a first wireless node; obtain a frame indicating negative acknowledgment of at least a portion of the PPDU if one or more conditions are met; and output, for re-transmission, one or more MAC Protocol Data Units (MPDUs) that were contained in the PPDU, after obtaining the frame. ### Claim 22 (depends on 21) The apparatus of claim 21, wherein the PPDU indicates a response to the PPDU is expected, wherein the indication comprises: a bit in a PHY header of the PPDU; or a value of a transmit opportunity (TXOP) field in the PHY header. ### Claim 23 (depends on 22) The apparatus of claim 22, wherein the PPDU indicates the response is expected at, in, or during a short interframe space (SIFS) after an end of the PPDU. ### Claim 24 (depends on 21) The apparatus of claim 21, wherein the frame comprises a block acknowledgment (BA) frame, a trigger frame, or a clear to send (CTS) frame. ### Claim 25 (depends on 24) The apparatus of claim 24, wherein the BA frame has a BA information field set to a value that indicates a negative acknowledgment of the PPDU. ### Claim 26 (depends on 24) The apparatus of claim 24, wherein the BA frame has at least one of: at least one association ID (AID) traffic ID (TID) information field set to a value that indicates a negative acknowledgment of the PPDU; or at least one association ID (AID) traffic ID (TID) information field with a BA bitmap subfield set to a value that indicates a negative acknowledgment of the PPDU. ### Claim 27 (depends on 21) The apparatus of claim 21, wherein: the frame includes a set of transmit parameters for the second wireless node to use when retransmitting one or more MAC Protocol Data Units (MPDUs) that were contained in the PPDU; and the one or more MPDUs are outputted for retransmission using at least some of the transmit parameters. ### Claim 28 (depends on 27) The apparatus of claim 27, wherein the transmit parameters include at least one of: a modulation and coding scheme (MCS), a number of spatial streams (NSS), a bandwidth (BW), a transmit power, a preamble puncture pattern, a PPDU type, a guard interval, a type of encoding, or a spatial reuse allowance. ### Claim 29 (depends on 1) The apparatus of claim 1, further comprising at least one transceiver configured to transmit the PPDU and receive the frame, wherein the apparatus is configured as a wireless station. ### Claim 30 A method for wireless communications at a first wireless node, obtaining information indicating transmission, from a second wireless node, of a physical layer (PHY) protocol data unit (PPDU) intended for the first wireless node; generating a frame indicating negative acknowledgment of at least a portion of the PPDU if one or more conditions are met; and outputting the frame to the second wireless node.