Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may identify a transmit diversity configuration for transmitting multiple sidelink messages. The UE may identify a transmit diversity configuration that indicates a set of component carriers (CCs) available for sidelink communication. The UE may transmit, based on the transmit diversity configuration, a first sidelink message having a first redundancy version (RV) of a transport block (TB), and a second sidelink message having a second RV of the TB, on multiple CCs. In a second case, the UE may identify a transmit diversity configuration indicating a set of precoding matrices. The UE may transmit the first sidelink message, including a TB or an RV of a TB, precoded using a first precoding matrix and a second sidelink message, including a TB or an RV of a TB, precoded using a second precoding matrix on multiple CCs.

Abstract: Methods, systems, and devices for wireless communications are described. In some systems, two devices may communicate over a sidelink and support a mutually understood transport block (TB) size (TBS) determination procedure associated with a data channel including a control message. A first device may encode and transmit information on the data channel, including the control message and a data message. A second device may receive and decode the information on the data channel. The first device and the second device may determine a TBS for encoding and decoding the data channel, respectively, based on determining an estimated resource element (RE) overhead for the control message and determining an approximate TBS based on the estimated RE overhead.

Abstract: Aspects presented herein may enable one or more wireless devices to perform a sidelink-based ranging and/or positioning with an assistance of an RIS. In one aspect, a first wireless device receives an information indicating at least a time in which at least one RIS is to be activated. The first wireless device transmits a first set of reference signals to a second wireless device via the at least one RIS. The first wireless receives a second set of reference signals transmitted from the second wireless device via the at least one RIS. The first wireless calculates a first signal RTT based on the first set of reference signals and the second set of reference signals.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first wireless communication device may receive, on a sidelink and from a second wireless communication device, resource reservation information associated with the second wireless communication device. The resource reservation information may identify sidelink resources that are reserved for the second wireless communication device for transmission on the sidelink. The first wireless communication device may transmit, on the sidelink, the resource reservation information to a third wireless communication device. Numerous other aspects are provided.

Abstract: The apparatus may be a first UE. The first UE may determine a first set of candidate BPLs associated with a first SL and a second set of candidate BPLs associated with a second SL. The first UE may further determine a configuration for FD beam training based on the determined first set of candidate BPLs and the determined second set of candidate BPLs, the FD beam training configuration may include multiple instances for which the first UE transmits and receives RS at a same time. The apparatus may also select, based on the determined FD beam training configuration, a first BPL in the first set of candidate BPLs for the first SL and a second BPL in the second set of candidate BPLs for the second SL. The first UE may establish FD communication with the second UE based on the selected first BPL and the selected second BPL.

Abstract: Methods, systems, and devices for wireless communications are described. Multiple transmitting user equipments (UEs) may send sidelink data transmissions. Receiving sidelink UEs may map sidelink feedback interlaces corresponding to detected sidelink data transmissions to sidelink feedback resources of a common sidelink feedback symbol according to an interlace mapping rule (e.g., defining which contiguous or non-contiguous frequency resources the UE is to use for transmitting sidelink feedback for the received sidelink data messages). The receiving UEs may map one or more replicas of initial interlaces of sidelink feedback resources to additional available resources of the sidelink feedback resources in the common feedback symbol.

Abstract: In an aspect, the present disclosure includes a method and apparatus for sidelink communications for identifying at least one slot in a measurement window as a channel busy ratio (CBR) relevant slot, calculating a CBR based on at least a measurement in at least the CBR relevant slot, and transmitting, or refraining from transmitting, a sidelink transmission based at least on the CBR.

Abstract: Wireless communications systems and methods related to channel occupancy time (COT) sharing for sidelink communications in unlicensed bands are provided. A method for wireless communication by a first user equipment (UE) may include measuring a first reference signal received power (RSRP) of a physical sidelink feedback channel (PSFCH) transmission transmitted during a channel occupancy time (COT) initiated by a second UE and accessing a first slot of the COT based on the first RSRP.

Abstract: A sidelink device apparatus is disclosed. The apparatus may transmit, in a first transmission occasion, SCI indicating a resource reservation for a self-interference measurement in a second transmission occasion. The apparatus may transmit a signal, in the second transmission occasion. The apparatus may perform the self-interference measurement based on the signal in the second transmission occasion using at least a portion of resources indicated in the resource reservation.

Abstract: Certain aspects of the present disclosure provide a method for wireless communications by a first user equipment (UE). The method generally includes receiving a first sidelink transmission from a second UE, determining resources for providing a feedback responsive to the first sidelink transmission, selecting one or multiple transmitter receiver points (TRPs), from a set of TRPs of the UE, for transmitting the feedback, based on one or more conditions, and transmitting the feedback on the determined resources using the selected TRPs.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine that a first quantity of physical sidelink feedback channel (PSFCH) transmissions to be transmitted in a slot fails to satisfy a condition that is based at least in part on a maximum quantity of PSFCH transmissions the UE can concurrently detect. The UE may identify, among the PSFCH transmissions to be transmitted in the slot, a subset of the PSFCH transmissions to be detected. For example, the subset of the PSFCH transmissions to be detected may include a second quantity of the PSFCH transmissions that satisfies the condition. Accordingly, the UE may monitor, during the slot, a PSFCH for the subset of the PSFCH transmissions. Numerous other aspects are provided.

Abstract: Methods, systems, and devices for wireless communications are described. One or more user equipments (UEs) may communicate in a wireless communications system by transmitting and receiving sidelink messages from other UEs. The UEs may transmit acknowledgement (ACK) or negative acknowledgment (NACK) feedback based on reception of sidelink messages for other UEs. The UEs may identify a sidelink feedback resource set including a set of feedback transmission slots for transmitting sidelink feedback. The UEs may perform NACK-only feedback, and may streamline feedback transmissions based on monitoring for other NACKs from other UEs. The UEs may prioritize feedback transmissions when the UE has multiple feedback transmissions queued, and when a UE has feedback to transmit and to receive in overlapping transmission time intervals (TTIs).

Abstract: Apparatus, methods, and computer program products for resource allocation for multi-TRP sidelink communication are provided. An example method includes receiving one or more signals comprising sidelink control information (SCI) at multiple TRPs of the sidelink device, the SCI indicating a resource reservation. The example method further includes decoding the SCI based on the one or more signals measuring a reference signal received power (RSRP) associated with the SCI at each of the multiple TRPs. The example method further includes. The example method further includes determining available resources for sidelink transmission for a subset of one or more of the multiple TRPs based on the RSRP.

Abstract: The apparatus may be configured to receive a plurality of indications for a plurality of TBs for the network encoding device to retransmit and to transmit, to a plurality of UEs, a FCNC request for a subset of the plurality of TBs for collecting feedback information regarding the subset of the plurality of TBs, the FCNC request being a NC packet including a second indication that the NC packet is associated with an FCNC feedback configuration, the FCNC feedback configuration being different from a feedback configuration for NC packets that are not FCNC requests. The apparatus may also be configured to receive, from at least one of the plurality of UEs, feedback associated with the FCNC request based on the FCNC feedback configuration and to encode, based on the received feedback, the plurality of TBs in at least one NC packet for transmission to the plurality of UEs.

Abstract: Disclosed are techniques for wireless communication. In an aspect, a first user equipment (UE) receives, from a network entity, a capability enquiry message for a sidelink positioning procedure, the capability enquiry message including at least a request for an indication of whether the first UE has the capability to provide a location of the first UE for the sidelink positioning procedure, and transmits, to the network node, a capability information message indicating one or more capabilities of the first UE to participate in the sidelink positioning procedure, the one or more capabilities of the first UE including at least the indication of whether the first UE has the capability to provide the location of the first UE for the sidelink positioning procedure.

Abstract: Methods, systems, and devices for wireless communication are described to support security techniques for ranging in wireless networks. A first device may transmit an indication to initiate a ranging procedure with a second device, and in response to the indication, the second device may transmit signaling to the first device and to one or more third devices. The first device and the one or more third devices may each determine a respective location metric associated with the second device based on the signaling. The one or more third devices may each transmit, to the first device, the respective location metric. Based on the communicated location metric(s), the first device may determine whether an eavesdropper is present and may communicate with the second device based on the determination.

Abstract: Methods, systems, and devices for wireless communication are described. A user equipment (UE) may generate sidelink assistance information based on an interference condition associated with an initial transmission of sidelink communication over a sidelink resource of a sidelink resource pool. The sidelink assistance information may include information associated with the interference condition. The UE may transmit an inter-UE coordination message including the generated sidelink assistance information. Additionally, or alternatively, a UE may receive inter-UE coordination message including sidelink assistance information. The UE may receive a retransmission of the sidelink communication and decode the received retransmission of the sidelink communication based on the received inter-UE coordination message including sidelink assistance information.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive a plurality of sidelink transmissions associated with a spatial division multiplexing (SDM) configuration. The UE may fail to decode at least one sidelink transmission of the plurality of sidelink transmissions. The UE may transmit feedback indicating the failure to decode the at least one sidelink transmission, wherein the feedback includes an indication of at least one layer of the SDM configuration associated with the at least one sidelink transmission. Numerous other aspects are described.

Abstract: Methods, systems, and devices for wireless communication are described to support configuring a user equipment (UE) operating in unlicensed spectrum with a set of component carriers (CCs) for sidelink communications using the unlicensed spectrum. In a first example, a UE may select a CC from the set of candidate CCs, for example, using a carrier selection configuration, and may select a resource in the CC for a sidelink communication. In a second example, a UE may select multiple candidate resources for a sidelink communication, for example, using a resource selection configuration and based on sensing performed by the UE. To indicate the reservation of a candidate resource, the UE may indicate both a CC in which the reserved resource is located and a location of the reserved resource within the carrier. The UE may transmit a sidelink message using a selected candidate resource in the unlicensed spectrum.

Abstract: Aspects for reducing interference for transmissions in unlicensed frequency bands are disclosed. An apparatus, e.g., a user equipment (UE) with information to transmit, identifies before transmitting the information in an unlicensed frequency spectrum, a specified duration of a listen-before-talk (LBT) operation in that spectrum. Based on the specified duration, the UE reduces a transmission time duration of a slot of the UE to increase a time duration of a remainder of the slot sufficient to prevent, or decrease the likelihood of, a transmission by the UE in the slot from interfering with an LBT operation by another UE.