# US 12,225,606 B2 · Integrated access and backhaul sidelink function control > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,225,606 B2 - Document ID: US12225606B2 - Status: Granted - Kind: B2 - Application number: 17/385,181 - Filed: 2021-07-26 - Published: 2023-01-26 - Granted: 2025-02-11 - Earliest claimed: 2021-07-26 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Sony Akkarakaran; Navid Abedini; Tao Luo; Junyi Li; Naeem Akl - Web page: https://patentgrep.com/patent/US12225606B2 ## CPC - H04W 8/005: {Discovery of network devices, e.g. terminals} - H04W 76/14: Direct-mode setup - H04B 7/15542: {Selecting at relay station its transmit and receive resources (selection of wireless resources by user or terminal H04W72/02; arrangements affording multiple use of the transmission path by two-dimensional division of the resources H04L5/0003, or by allocating sub-channels H04L5/003)} - H04W 56/002: {Mutual synchronization} - H04W 72/25: between terminals via a wireless link, e.g. sidelink - H04W 88/04: adapted for relaying to or from another terminal or user - H04W 88/12: Access point controller devices - H04W 92/18: between terminal devices - 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 Methods, systems, and devices for wireless communications are described. A base station (e.g., a central unit (CU) function of the base station) may select, from a set of distributed units (DUs) associated with the CU, a DU of an integrated access and backhaul (IAB) node to control sidelink communications for a user equipment (UE). The base station may determine a configuration of sidelink parameters for the sidelink communications with the UE, the sidelink parameters comprising an identification of the selected DU. The base station may transmit, to the TAB node performing sidelink communications with the UE, an indication of the configuration of sidelink parameters for the sidelink communications. ## Claims ### Claim 1 A method for wireless communication at a central unit, comprising: selecting, from a set of distributed units associated with the central unit, a distributed unit of an integrated access and backhaul node having a sidelink connection with a user equipment (UE) to control sidelink communications with the UE based at least in part on the distributed unit being collocated within the integrated access and backhaul node having the sidelink connection with the UE or on a first synchronization signal transmitted from the selected distributed unit being quasi-collocated with respect to a second synchronization signal transmitted from the distributed unit performing sidelink communications with the UE; determining a configuration of sidelink parameters for the sidelink communications with the UE, the sidelink parameters comprising an identification of the selected distributed unit; and transmitting, to the integrated access and backhaul node performing sidelink communications with the UE, an indication of the configuration of sidelink parameters for the sidelink communications. ### Claim 2 (depends on 1) The method of claim 1, wherein selecting the distributed unit comprises: selecting the distributed unit of the integrated access and backhaul node having the sidelink connection with the UE based at least in part on the distributed unit being collocated within the integrated access and backhaul node having the sidelink connection with the UE. ### Claim 3 (depends on 1) The method of claim 1, further comprising: determining that the first synchronization signal transmitted from the selected distributed unit is quasi-collocated with respect to the second synchronization signal transmitted from the distributed unit performing sidelink communications with the UE, wherein the selecting is based at least in part on the quasi-collocated first synchronization signal and second synchronization signal. ### Claim 4 (depends on 1) The method of claim 1, further comprising: exchanging one or more configuration messages with the distributed unit performing sidelink communications with the UE, a parent distributed unit of the distributed unit performing sidelink communications with the UE, or both, wherein the configuration of sidelink parameters is based at least in part on the exchanging. ### Claim 5 (depends on 1) The method of claim 1, further comprising: identifying a type of sidelink communications, a set of sidelink resources associated with the sidelink communications, or both, wherein the selecting is based at least in part on the identifying. ### Claim 6 (depends on 1) The method of claim 1, wherein the indication is transmitted via a radio resource control (RRC) message, an F1 interface message, medium access control (MAC) control element (CE) message, a downlink control information (DCI) message, a sidelink control information (SCI) message, or a combination thereof. ### Claim 7 (depends on 1) The method of claim 1, wherein the configuration of sidelink parameters comprises an indication that the UE is to perform timing synchronization with the selected distributed unit for the sidelink communications, an indication that the UE is to receive sidelink grants from the selected distributed unit for the sidelink communications, or both. ### Claim 8 (depends on 1) The method of claim 1, wherein the indication is transmitted directly to the distributed unit performing sidelink communications with the UE or relayed via one or more parent distributed units of the distributed unit performing sidelink communications with the UE. ### Claim 9 A method for wireless communication at a distributed unit of an integrated access and backhaul node performing sidelink communications with a user equipment (UE), comprising: identifying a selected distributed unit, the selected distributed unit selected by a central unit to control sidelink communications for the UE based at least in part on the selected distributed unit and the distributed unit performing the sidelink communications with the UE being collocated within the integrated access and backhaul node or on a first synchronization signal transmitted from the selected distributed unit being quasi-collocated with respect to a second synchronization signal transmitted from the distributed unit performing sidelink communications with the UE; determining a configuration of sidelink parameters for the sidelink communications with the UE based at least in part on the identifying, the sidelink parameters comprising an identification of the selected distributed unit; and transmitting an indication of the sidelink parameters to the UE. ### Claim 10 (depends on 9) The method of claim 9, further comprising: determining that the selected distributed unit and the distributed unit performing sidelink communications with the UE are collocated within the integrated access and backhaul node, wherein the selected distributed unit is based at least in part on the collocation. ### Claim 11 (depends on 9) The method of claim 9, further comprising: determining that the first synchronization signal transmitted from the selected distributed unit is quasi-collocated with respect to the second synchronization signal transmitted from the distributed unit performing sidelink communications with the UE, wherein the selected distributed unit is based at least in part on the quasi-collocated first synchronization signal and second synchronization signal. ### Claim 12 (depends on 9) The method of claim 9, further comprising: exchanging one or more configuration messages with the selected distributed unit, a parent distributed unit of the distributed unit performing sidelink communications with the UE, or both, wherein the configuration of sidelink parameters is based at least in part on the exchanging. ### Claim 13 (depends on 9) The method of claim 9, further comprising: identifying a type of sidelink communications, a set of sidelink resources associated with the sidelink communications, or both, wherein the selected distributed unit is based at least in part on the identifying. ### Claim 14 (depends on 9) The method of claim 9, wherein the indication is received via a radio resource control (RRC) message, an F1 interface message, medium access control (MAC) control element (CE) message, a downlink control information (DCI) message, a sidelink control information (SCI) message, or a combination thereof. ### Claim 15 (depends on 9) The method of claim 9, wherein the configuration of sidelink parameters comprises an indication that the UE is to perform timing synchronization with the selected distributed unit for the sidelink communications, an indication that the UE is to receive sidelink grants from the selected distributed unit for the sidelink communications, or both. ### Claim 16 (depends on 9) The method of claim 9, wherein the indication is received directly to the distributed unit performing sidelink communications with the UE or relayed via one or more parent distributed units of the distributed unit performing sidelink communications with the UE. ### Claim 17 A method for wireless communication at a user equipment (UE), comprising: receiving, from a distributed unit of an integrated access and backhaul node performing sidelink communications with the UE, a configuration of sidelink parameters for sidelink communications with the distributed unit; identifying a selected distributed unit, the selected distributed unit selected by a central unit to control sidelink communications for the UE based at least in part on the selected distributed unit and the distributed unit performing the sidelink communications with the UE being collocated within the integrated access and backhaul node or on a first synchronization signal transmitted from the selected distributed unit being quasi-collocated with respect to a second synchronization signal transmitted from the distributed unit performing sidelink communications with the UE; and performing sidelink communications based at least in part on the selected distributed unit. ### Claim 18 (depends on 17) The method of claim 17, further comprising: determining that the first synchronization signal transmitted from the selected distributed unit is quasi-collocated with respect to the second synchronization signal transmitted from the distributed unit performing sidelink communications with the UE, wherein the selected distributed unit is based at least in part on the quasi-collocated first synchronization signal and second synchronization signal. ### Claim 19 (depends on 17) The method of claim 17, further comprising: exchanging one or more configuration messages with the selected distributed unit, a parent distributed unit of the distributed unit performing sidelink communications with the UE, or both, wherein the configuration of sidelink parameters is based at least in part on the exchanging. ### Claim 20 (depends on 17) The method of claim 17, further comprising: identifying a type of sidelink communications, a set of sidelink resources associated with the sidelink communications, or both, wherein the selected distributed unit is based at least in part on the identifying. ### Claim 21 (depends on 17) The method of claim 17, wherein an indication of the configuration of sidelink parameters is received via a radio resource control (RRC) message, an F1 interface message, medium access control (MAC) control element (CE) message, a downlink control information (DCI) message, a sidelink control information (SCI) message, or combinations thereof. ### Claim 22 (depends on 17) The method of claim 17, wherein the configuration of sidelink parameters comprises an indication that the UE is to perform timing synchronization with the selected distributed unit for the sidelink communications, an indication that the UE is to receive sidelink grants from the selected distributed unit for the sidelink communications, or both. ### Claim 23 (depends on 17) The method of claim 17, wherein an indication of the configuration of sidelink parameters is received directly from the distributed unit performing sidelink communications with the UE or relayed via one or more parent distributed units of the distributed unit performing sidelink communications with the UE. ### Claim 24 An apparatus for wireless communication at a central unit, comprising: at least one processor; at least one memory coupled with the at least one processor; and instructions stored in the at least one memory and executable by the at least one processor to cause the apparatus to: select, from a set of distributed units associated with the central unit, a distributed unit of an integrated access and backhaul node having a sidelink connection with a user equipment (UE) to control sidelink communications with the UE based at least in part on the distributed unit being collocated within the integrated access and backhaul node having the sidelink connection with the UE or on a first synchronization signal transmitted from the selected distributed unit being quasi-collocated with respect to a second synchronization signal transmitted from the distributed unit performing sidelink communications with the UE; determine a configuration of sidelink parameters for the sidelink communications with the UE, the sidelink parameters comprising an identification of the selected distributed unit; and transmit, to the integrated access and backhaul node performing sidelink communications with the UE, an indication of the configuration of sidelink parameters for the sidelink communications. ### Claim 25 (depends on 24) The apparatus of claim 24, wherein the instructions to select the distributed unit are executable by the at least one processor to cause the apparatus to: select the distributed unit of the integrated access and backhaul node having the sidelink connection with the UE based at least in part on the distributed unit being collocated within the integrated access and backhaul node having the sidelink connection with the UE. ### Claim 26 (depends on 24) The apparatus of claim 24, wherein the instructions are further executable by the at least one processor to cause the apparatus to: determine that the first synchronization signal transmitted from the selected distributed unit is quasi-collocated with respect to the second synchronization signal transmitted from the distributed unit performing sidelink communications with the UE, wherein the selecting is based at least in part on the quasi-collocated first synchronization signal and second synchronization signal. ### Claim 27 (depends on 24) The apparatus of claim 24, wherein the instructions are further executable by the at least one processor to cause the apparatus to: exchange one or more configuration messages with the distributed unit performing sidelink communications with the UE, a parent distributed unit of the distributed unit performing sidelink communications with the UE, or both, wherein the configuration of sidelink parameters is based at least in part on the exchanging.