# US 2025/0097679 A1 · Uu-based sidelink feedback > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0097679 A1 - Document ID: US20250097679A1 - Status: Published application - Kind: A1 - Application number: 18/469,242 - Filed: 2023-09-18 - Published: 2025-03-20 - Earliest claimed: 2023-09-18 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Anantharaman BALASUBRAMANIAN; Shuanshuan WU - Web page: https://patentgrep.com/patent/US20250097679A1 ## CPC - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04W 4/40: for vehicles, e.g. vehicle-to-pedestrians [V2P] - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 4/06: Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services - H04W 92/18: between terminal devices - 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 Various aspects of the present disclosure generally relate to wireless communication. Some aspects relate to hybrid automatic repeat request (HARQ) feedback for sidelink communications. Some aspects more specifically relate to providing HARQ feedback for sidelink communications over a Uu interface. In some aspects, HARQ feedback is provided over a Uu interface for sidelink communications between vehicles. For example, the HARQ feedback may be provided via a vehicle-to-network-to-vehicle (V2N2V) interface in response to a connected groupcast or connectionless groupcast communication. ## Claims ### Claim 1 An apparatus for wireless communication at a transmitting user equipment (Tx UE), comprising: one or more memories storing processor-executable code; and one or more processors coupled to the one or more memories, at least one of the one or more processors configured to cause the Tx UE to: receive a vehicle-to-network-to-everything (V2N2X) configuration for communication with one or more receiving UEs (Rx UEs); transmit, via a Uu interface, a V2N2X message to a serving network node in accordance with the V2N2X configuration; and receive, via the Uu interface, feedback associated with the V2N2X message via the serving network node, the feedback being associated with one or more feedback messages output by the one or more Rx UEs. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the V2N2X message includes a distance-based V2N2X message or a zone-based V2N2X message. ### Claim 3 (depends on 1) The apparatus of claim 1, wherein the one or more feedback messages each include one of an acknowledgement (ACK) message or a negative acknowledgement (NACK) message. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein the feedback includes aggregated feedback associated with the one or more feedback messages output by the one or more Rx UEs. ### Claim 5 (depends on 1) The apparatus of claim 1, wherein the V2N2X configuration for communication with the one or more Rx UEs includes a configuration for a broadcast communication, a configuration for a connected groupcast communication, or a configuration for a connectionless groupcast communication. ### Claim 6 An apparatus for wireless communication at a receiving user equipment (Rx UE), comprising: one or more memories storing processor-executable code; and one or more processors coupled to the one or more memories, at least one of the one or more processors configured to cause the Rx UE to: receive, via a Uu interface, one or more vehicle-to-network-to-everything (V2N2X) messages from a serving network node, the one or more V2N2X messages each being associated with a transmitting UE (Tx UE); receive one or more uplink feedback configurations from the serving network node; and transmit, via the Uu interface, one or more feedback messages, each associated with at least one of the one or more V2N2X messages, to the serving network node in accordance with the one or more uplink feedback configurations. ### Claim 7 (depends on 6) The apparatus of claim 6, wherein each of the one or more uplink feedback configurations is associated with a different connected groupcast communication. ### Claim 8 (depends on 6) The apparatus of claim 6, wherein transmitting the one or more feedback messages includes transmitting the one or more feedback messages associated with an ith groupcast of N number of connected groupcasts, wherein i is equal to a slot number mod N. ### Claim 9 (depends on 6) The apparatus of claim 6, wherein transmitting the one or more feedback messages includes transmitting the one or more feedback messages with a group identifier. ### Claim 10 (depends on 6) The apparatus of claim 6, wherein at least one processor of the one or more processors, to receive the one or more uplink feedback configurations, are configured to cause the Rx UE to receive the one or more uplink feedback configurations as one or more separate or multiplexed uplink feedback configurations. ### Claim 11 (depends on 6) The apparatus of claim 6, wherein the one or more V2N2X messages include one more distance-based V2N2X messages or one or more zone-based V2N2X messages. ### Claim 12 (depends on 6) The apparatus of claim 6, wherein the one or more feedback messages each include one of an acknowledgement (ACK) or a negative acknowledgement (NACK). ### Claim 13 (depends on 6) The apparatus of claim 6, wherein the one or more uplink feedback configurations are received via radio resource control signaling, downlink control information signaling, or medium access control (MAC) control element (MAC-CE) signaling. ### Claim 14 (depends on 6) The apparatus of claim 6, wherein at least one processor of the one or more processors is further configured to cause the Rx UE to transmit the V2N2X message to a different Rx UE via a sidelink interface. ### Claim 15 (depends on 14) The apparatus of claim 14, wherein at least one processor of the one or more processors is further configured to cause the Rx UE to receive a sidelink feedback message from the different Rx UE and transmit the sidelink feedback message from the different Rx UE to the serving network node via the Uu interface. ### Claim 16 An apparatus for wireless communication at a transmitting network node, comprising: one or more memories storing processor-executable code; and one or more processors coupled to the one or more memories, at least one of the one or more processors configured to cause the transmitting network node to: identify one or more receiving network nodes, each associated with one or more receiving user equipments (UEs) (Rx UEs); receive, via a Uu interface, a vehicle-to-network-to-everything (V2N2X) message transmitted by a transmitting UE (Tx UE); transmit the V2N2X message to the one or more receiving network nodes via an X2 interface; receive one or more feedback messages from the one or more Rx UEs; and transmit feedback to the Tx UE via the Uu interface, the feedback being associated with the one or more feedback messages received from the one or more Rx UEs. ### Claim 17 (depends on 16) The apparatus of claim 16, wherein at least one processor of the one or more processors, to transmit the V2N2X message to the one or more receiving network nodes, are configured to cause the transmitting network node to transmit the V2N2X message with a group identifier. ### Claim 18 (depends on 16) The apparatus of claim 16, wherein at least one processor of the one or more processors, to transmit the V2N2X message to the one or more receiving network nodes, are configured to cause the transmitting network node to transmit the V2N2X message with a message type indication. ### Claim 19 (depends on 18) The apparatus of claim 18, wherein the message type indication identifies the V2N2X message as a broadcast message, a connected groupcast message, or a connectionless groupcast message. ### Claim 20 (depends on 16) The apparatus of claim 16, wherein the feedback includes aggregated feedback associated with the one or more feedback messages output by the one or more receiving network nodes. ### Claim 21 (depends on 16) The apparatus of claim 16, wherein the feedback is associated with an implicit acknowledgement or an explicit acknowledgement, from the one or more receiving network nodes, that the V2N2X message was received by at least one of the one or more Rx UEs. ### Claim 22 An apparatus for wireless communication at a receiving network node, comprising: one or more memories storing processor-executable code; and one or more processors coupled to the one or more memories, at least one of the one or more processors configured to cause the receiving network node to: receive, via an X2 interface, a vehicle-to-network-to-everything (V2N2X) message from a transmitting network node; transmit, via a Uu interface, one or more uplink feedback configurations to one or more receiving user equipments (Rx UEs); receive, via the Uu interface, one or more feedback messages, each associated with one of the one or more Rx UEs; and transmit each of the one or more feedback messages to the transmitting network node via the X2 interface. ### Claim 23 (depends on 22) The apparatus of claim 22, wherein at least one processor of the one or more processors, to transmit the one or more uplink feedback configurations to the one or more Rx UEs, are configured to cause the receiving network node to transmit the one or more uplink feedback configurations to the one or more Rx UEs via downlink control information signaling. ### Claim 24 (depends on 22) The apparatus of claim 22, wherein at least one of the one or more uplink feedback configurations includes a semi-static uplink grant. ### Claim 25 (depends on 24) The apparatus of claim 24, wherein at least one processor of the one or more processors is further configured to cause the receiving network node to deactivate the semi-static uplink grant after a predetermined amount of time since the V2N2X message was received from the transmitting network node. ### Claim 26 (depends on 24) The apparatus of claim 24, wherein at least one processor of the one or more processors is further configured to cause the receiving network node to deactivate the semi-static uplink grant after a predetermined amount of time since a last communication associated with the V2N2X message was received from the transmitting network node. ### Claim 27 (depends on 22) The apparatus of claim 22, wherein at least one of the one or more uplink feedback configurations includes a configuration for an uplink grant to occur a number of slots after reception of a connected groupcast message. ### Claim 28 (depends on 22) The apparatus of claim 22, wherein receiving the V2N2X message includes receiving the V2N2X message with a group identifier, and wherein transmitting the one or more uplink feedback configurations includes transmitting the one or more uplink feedback configurations with the group identifier. ### Claim 29 (depends on 22) The apparatus of claim 22, wherein at least one processor of the one or more processors, to receive the V2N2X message, are configured to cause the receiving network node to receive the V2N2X message with a message type indication. ### Claim 30 (depends on 29) The apparatus of claim 29, wherein the message type indication identifies the V2N2X message as a broadcast message, a connected groupcast message, or a connectionless groupcast message.