Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a repeater may transmit, to a user equipment (UE), an alternate access path indication associated with an access link connection path for connecting to a network node. The repeater may communicate with the UE on a side channel to establish a connection to the network node via the access link connection path. Numerous other aspects are described.

Abstract: This disclosure provides systems, devices, apparatus, and methods, including computer programs encoded on storage media, for beam training resource selection by a sidelink UE. A first UE may determine to perform beam training with a second UE in a set of beam training resources. The set of beam training resources may include a first subset of beam training resources for UEs without a RRC connection and a second subset of beam training resources for UEs with a RRC connection, where the first subset of beam training resources and the second subset of beam training resources are non-overlapping. The first UE may determine whether the first UE is RRC connected with the second UE and perform beam training in one of the first subset of beam training resources or the second subset of beam training resources based on whether the first UE is RRC connected with the second UE.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first user equipment (UE) may receive, from one or more additional UEs, one or more indicators corresponding to one or more resource reservations. Accordingly, the UE may transmit data, to a second UE, on a sidelink channel, with at least one resource reservation, of the one or more resource reservations, indicated within a control element transmitted with the data. For example, the control element may include a list or a bitmap indicating the at least one resource reservation. Numerous other aspects are described.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) with multiple transmission reception points (TRPs) (e.g., a multi-TRP UE) may receive sidelink control information including an interference measurement configuration indicating resources allocated for sidelink interference measurements across multiple TRPs. In some cases, the multi-TRP UE may decode the sidelink control information including the interference measurement configuration. The multi-TRP UE may receive one or more signals from a first UE, a second UE, or both. The multi-TRP UE may perform a sidelink interference measurement for each signal based on the interference measurement configuration. The multi-TRP UE may determine whether to process the signals in combination or separately across TRPs based on the sidelink interference measurements.

Abstract: Certain aspects of the present disclosure to techniques for sidelink re-discovery without repeating beamforming in millimeter wave (e.g., Frequency Range 2) bands. For example, a Tx UE may complete a first beam training with a Rx UE. The Tx UE may generate a discovery message that includes at least one of: an indication of a beam training reference signal (BT-RS) sequence index of the first beam training; an indication of a timer for changing the BT-RS sequence; or an indication of a second BT-RS sequence to be used by the Tx UE before an expiration of the timer. The second BT-RS sequence may be indicated as an index to a set of BT-RS sequences including the BT-RS sequence associated with the first beam training. The Tx may transmit the generated discovery message to the Rx UE.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit compressed bitmap(s) to indicate preferred or non-preferred sidelink resources. A first UE may monitor a set of sidelink resources including a set of slots and subchannels for the slots and determine which resources are available for communications for a second UE. In some examples, the first UE may generate a bitmap indicating which slots have at least one subchannel that is unavailable, and, for each slot having at least one subchannel that is unavailable, a bitmap indicating which subchannels are unavailable for that slot. The first UE may transmit the bitmaps to the second UE. In some examples, the first UE may generate a bitmap indicating which slots have at least one subchannel that is available, and, for each slot having at least one subchannel that is available, a bitmap indicating which subchannels are available.

Abstract: A first UE may determine that a BPL with a second UE has degraded below a threshold and generate, based on the determination, a beam training frame for an on-demand beam training procedure. The beam training frame may include a first AGC symbol, SCI indicating that the beam training frame is for beam training, and one or more sets of an AGC symbol and beam sweeping reference signals. The first UE may transmit the beam training frame multiplexed with one or more data frames to the second UE. The second UE may receive the beam training frame for the on-demand beam training procedure based on a determination that the BPL with the first UE has degraded below the threshold.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first user equipment (UE) may identify a collision on a victim resource based at least in part on an aggressor reservation transmitted by a second UE. The first UE may transmit, to the second UE via a sidelink feedback channel, a resource collision indication that indicates at least one of the victim resource or the aggressor reservation, wherein the resource collision indication is multiplexed on one or more resources that are useable for sidelink feedback. Numerous other aspects are provided.

Abstract: Aspects presented herein may enable a wireless device to perform an SL ranging based on a single-sided PRS transmission. In one aspect, a first wireless device transmits one or more reference signals to at least one RIS associated with a second wireless device. The first wireless device receives one or more reflected reference signals reflected from the at least one RIS. The first wireless device calculates a signal RTT based on the one or more reference signals and the one or more reflected reference signals. In another aspect, a second wireless device transmits, to a first wireless device, information indicating a time, a duration, or a periodicity in which at least one RIS associated with the second wireless device is to be activated. The second wireless device activate the at least one RIS based on the information.

Abstract: Disclosed are techniques for wireless positioning. In an aspect, a road-side unit (RSU) may join a first sidelink (SL) ranging session between a first user equipment (UE) and a second UE. The RSU may perform SL ranging with the first UE to determine first ranging information comprising at least a RTT to the first UE. The RSU may perform SL ranging with the second UE to determine second ranging information comprising at least a RTT to the second UE. The RSU may send the first ranging information and the second ranging information to at least one of the first UE or the second UE, or calculate a range between the first UE and the second UE based on the first ranging information and the second ranging information, and send the range to at least one of the first UE and the second UE.

Abstract: Aspects presented herein improve congestion control mechanism for UEs with multiple TRPs, where at least one of the SL RSSI measurement, the CBR measurement, the CR evaluation and/or the congestion control mechanism for the UE is optimized. In one aspect, the apparatus evaluates a CR for each TRP of a plurality of TRPs at the UE. The apparatus determines whether the UE is allowed to transmit on one or more of the TRPs of the plurality of TRPs based at least on the evaluated CR for each TRP of the plurality of TRPs and on at least one CR limit. The apparatus transmits on at least one TRP of the one or more of the TRPs based on the determination whether to transmit on the one or more TRPs.

Abstract: Aspects of the disclosure relate to wireless communications including sidelink communications between wireless devices. Adaptation of a resource exclusion reference signal receive power (RSRP) threshold for scheduling resources for a device using such sidelink communications includes utilization of first and second time/frequency windows of available resources to determine the number of free resources in each window. If the free resources in either window are less than a predetermined free resource threshold, the resource exclusion RSRP threshold is increased to gain further potential time/frequency resources that may be scheduled by the device.

Abstract: Methods, systems, and devices for wireless communications are described. A first user equipment (UE) may receive, at a first transmission reception point, a first transmission from a second UE associated with communications between the second UE and a third UE. The first UE may receive, at a second transmission reception point, a second transmission. The first UE may identify transmissions having overlapping time-frequency resources based on receiving the first transmission and the second transmission. In some examples, the identified transmissions may include the first transmission and the second transmission. Additionally or alternatively, the identified transmissions may include a third transmission and a fourth transmission. The first UE may transmit an interference mitigation signal to the second UE. The interference mitigation signal may include an indication to orthogonalize one or more reference signals, a negative acknowledgment indication, or both.

Abstract: A method or apparatus for wireless communication at a wireless device. The wireless device transmits sidelink control information (SCI) indicating an aperiodic resource reservation and indicating a time gap between aperiodic resource reservations based at least in part on supplemental bits. The apparatus transmits a sidelink message based on the aperiodic resource reservation on a resource pool that supports periodic resource reservation.

Abstract: Certain aspects of the present disclosure provide techniques for configuring sidelink communications between user equipment's (UEs). Per one technique, during a discovery opportunity, a first UE and a second UE may identify a subset of beam pairs suitable for communication, and schedule a discontinuous transmission (DTX) occasion during the discovery opportunity. During the DTX occasion, the first UE and second UE may perform a beam refinement procedure to determine a beam pair (BP) over which to communicate, from the identified subset of beam pairs. The beam refinement procedure may include beam narrowing of at least one of the identified subset of beam pairs.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first sidelink user equipment (UE) may detect a second frequency range (FR2) radio link or beam failure between the first sidelink UE and a second sidelink UE. The first sidelink UE may transmit, to the second sidelink UE, an indication of the FR2 radio link or beam failure based at least in part on a first frequency range (FR1) radio resource control (RRC) connection between the first sidelink UE and the second sidelink UE.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first user equipment (UE) may receive, from a second UE, an inter-UE coordination message comprising an indication of a first sidelink resource, of a set of sidelink resources, corresponding to a transmission by the second UE. The UE may transmit a sidelink communication using a second sidelink resource, of a subset of candidate sidelink resources of a set of candidate resources, based at least in part on the indication of the first sidelink resource and a communication relationship between the first UE and the second UE. Numerous other aspects are described.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, at a second protocol layer of the UE and from a first protocol layer of the UE, the second protocol layer being lower than the first protocol layer, an indication of one or more quality of service parameters associated with a data packet to be transmitted by the UE. The UE may identify, from the one or more quality of service parameters, directional coverage information associated with the data packet, the directional coverage information indicative of one or more transmission directions in which the data packet is to be transmitted. The UE may transmit the data packet in accordance with at least the directional coverage information of the one or more quality of service parameters.

Abstract: A first UE may determine to communicate with a second UE, but may maintain or establish a RRC connection with a third UE upon determining that potential interference may occur between the first UE and the third UE. The potential inference may be a received interference in which the first UE receives interference from the third UE as a result of a communication between the third UE and a fourth UE, or a transmitted interference in which the first UE causes interference to the third UE as a result of a communication between the first UE and the second UE. The first UE may communicate mitigation information to the third UE through the RRC connection, where the interference mitigation information may be associated with the communication between the first UE and the second UE or the communication between the third UE and the fourth UE.

Abstract: Methods, systems, and devices for are described. A user equipment (UE) may transmit, via a first transmission-reception point (TRP), a first sidelink control information (SCI) scheduling a first sidelink transmission from the UE, the first SCI including an indication that a first hybrid automatic repeat request (HARQ) process associated with the first sidelink transmission is enabled. The UE may transmit, via a second TRP different from the first TRP, a second SCI scheduling a second sidelink transmission from the UE, the second SCI including an indication that a second HARQ process associated with the second sidelink transmission is disabled. The UE may transmit the first sidelink transmission and the second sidelink transmission via the first TRP and the second TRP, respectively, based on transmitting the first and second SCI. The UE may monitor, via the first TRP, for a feedback message based on transmitting the first sidelink transmission.