Abstract: Methods, systems, and devices for wireless communications are described. Generally, the described techniques provide for efficiently retransmitting radio link control (RLC) protocol data units (PDUs) to one or more UEs. When a user equipment (UE) fails to receive or decode an RLC PDU transmitted by a base station, the UE may transmit a status PDU to the base station indicating that the UE failed to receive or decode the RLC PDU. The base station may receive the status PDU from the UE, and the base station may generate a repair PDU that includes redundant bits of the lost PDU (e.g., the PDU that the UE failed to receive or decode). The base station may then transmit the repair PDU to the UE, and the UE may use the redundant bits in the repair PDU (e.g., in combination with buffered PDUs) to attempt to correctly decode the lost PDU.

Abstract: Certain aspects of the subject matter described in this disclosure can be implemented in a method for wireless communication by a user equipment (UE). The method generally includes determining whether a plurality of beam configurations configured for processing one or more downlink (DL) signals are different than a first beam configuration for processing at least one CSI-RS, the one or more DL signals to be received in the same symbol as the at least one CSI-RS; selecting a second beam configuration for processing the at least one CSI-RS based on the determination; receiving the at least one CSI-RS; and processing the at least one CSI-RS based on the selected second beam configuration.

Abstract: This disclosure provides systems, methods, and devices for wireless communication that support separate hybrid automatic receipt request (HARQ) acknowledgement by member user equipments (UEs) cooperating as a virtual UE for downlink transmissions. In a first aspect, a virtual UE may detect a downlink transmission, wherein the virtual UE includes two or more member UEs in communication with each other and configured to cooperate in communications with the serving base station. The virtual UE may generate one or more acknowledgement codebooks configured to indicate an acknowledgement status by the virtual UE. The virtual UE may attempt to decode the downlink transmission and report an acknowledgment indicator that reflects the result of the decoding. The acknowledgment indicator includes an acknowledgement state selected from an acknowledgement codebook associated with the member UE. Other aspects and features are also claimed and described.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may obtain a nominal resource block value associated with one or more allocated subchannels for a sidelink communication. The UE may identify a number of physical sidelink shared channel (PSSCH) resource elements to be used for a transport block size calculation based at least in part on the nominal resource block value. The UE may transmit the sidelink communication, and reserve one or more resources for one or more respective retransmissions of the sidelink communication, based at least in part on the number of PSSCH resource elements. Numerous other aspects are described.

Abstract: A method for wireless communication at a first sidelink user equipment (UE) includes performing, in a shared radio frequency band, a listen-before-talk (LBT) for a channel occupancy time (COT). The method also includes selecting a full-slot sidelink channel waveform hypothesis associated with a first starting symbol, or a half-slot sidelink channel waveform hypothesis associated with a second starting symbol, in accordance with a timing associated with clearing the LBT. The method further includes transmitting, during the COT, sidelink information to a second sidelink UE, a transport block size (TBS) associated with the COT having a fixed number of resources, the fixed number of resources being a same number of resources for full-slot sidelink channel waveform hypothesis and the half-slot sidelink channel waveform hypothesis.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication of a sidelink slot format, wherein the sidelink slot format indicates a configuration of sidelink feedback resources. The UE may measure a signal, associated with a channel access procedure, after a first symbol of a first sidelink slot and prior to a mini-slot of the first sidelink slot, and wherein the sidelink slot format indicates that the first sidelink slot is associated with the sidelink feedback resources. The UE may transmit, using a transmission starting location of the mini-slot or of a symbol of a second sidelink slot, a sidelink communication based at least in part on the measurement of the signal, wherein a format of the sidelink feedback resources is based at least in part on the transmission starting location. Numerous other aspects are described.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a wireless communication device may start, in a no-listen-before-talk (no-LBT) mode and after a first channel occupancy time (COT), an away period during which no transmissions are to occur in abeam direction used in the first COT. The wireless communication device may perform, during the away period, channel sensing. The wireless communication device may transmit a communication in a second COT after the away period, based at least in part on a result of the channel sensing. Numerous other aspects are described.

Abstract: Wireless communications systems, apparatuses, and methods are provided. A method of wireless communication performed by a first sidelink user equipment (UE) includes performing a listen-before-talk (LBT) procedure and transmitting, to a second sidelink UE based on the LBT procedure being successful, a sidelink synchronization signal block (S-SSB) in one of a plurality of candidate S-SSB locations of a slot.

Abstract: Certain aspects of the present disclosure provide techniques for using a guard interval in a delay-Doppler domain. A method of wireless communication includes converting information in a delay-Doppler domain to a time-frequency domain, wherein the information includes data and at least one guard interval (GI); mapping the converted information to time and frequency resources of an orthogonal frequency domain multiplexing (OFDM) resource grid in the time-frequency domain; generating a time-domain waveform based on the OFDM resource grid, wherein the time-domain waveform includes one or more GIs; and outputting the time-domain waveform for transmission to a node.

Abstract: Techniques for line-of-sight (LOS) probability map signaling are disclosed. The techniques can include receiving a positioning signal via a wireless link between the UE and a transmission/reception point (TRP) of a radio access network (RAN), identifying an LOS probability function associated with the wireless link based on LOS probability map information provided by a location management function (LMF) of a core network for the RAN, and generating an LOS probability estimate for the wireless link using the LOS probability function.

Abstract: Methods, systems, and devices for method for wireless communication are described. A UE may receive one or more control messages that indicate a quantity of sounding reference signal (SRS) resource sets, a quantity of one or more SRS resource indicator fields included in one or more control messages, and a set of parameters, and at least one maximum rank value associated with uplink shared channel transmissions and based on a threshold quantity of rank values supported by the UE. The UE receives a downlink control information (DCI) message including DCI and including the one or more SRS resource indicator fields, and interprets the one or more SRS resource indicator fields based on a quantity of the at least one maximum rank value.

Abstract: The apparatus receives a PUCCH resource configuration associated with a PUCCH resource. The PUCCH resource configuration indicates at least one of a PUCCH resource repetition configuration or a PUCCH resource inter-slot frequency hopping configuration for the PUCCH resource that is independent of PUCCH formats. In addition, the apparatus transmits a PUCCH in the PUCCH resource based on the at least one of the PUCCH resource repetition configuration or the PUCCH resource inter-slot frequency hopping configuration configured in the PUCCH resource configuration. The received PUCCH resource configuration may override a PUCCH format configuration. The apparatus may receive a DCI indicating the PUCCH resource and/or a MAC-CE associated with the PUCCH resource configuration, and may transmit the PUCCH based on the received DCI/MAC-CE.

Abstract: Wireless communications systems and methods related to intra-slot transmit beam selection and receive beam selection for sidelink are provided. A first user equipment (UE) transmits, to a second UE over a sidelink, a plurality of beam measurement signals in a plurality of beam directions during a first slot, wherein each beam measurement signal of the plurality of beam measurement signals includes at least one of sidelink control information (SCI) or a channel state information-reference signal (CSI-RS), and wherein the plurality of beam directions includes at least two different beam directions. The first UE receives, from the second UE, an indication of a preferred beam direction of the plurality of beam directions. The first UE transmits, to the second UE over the sidelink, data in the preferred beam direction.

Abstract: A method for wireless communication performed by a user equipment (UE) includes receiving, from a base station on a granting group common (GC)-physical downlink control channel (PDCCH), a multimedia broadcast multicast service (MBMS) downlink grant that schedules an MBMS transmission at each UE of a group of UEs that includes the UE. The method also includes receiving, from the base station on a triggering GC-PDCCH, a message indicating respective feedback resources for each UE of the group of UEs. The method further includes receiving, from the base station, the MBMS transmission. The method still further includes transmitting, to the base station via the feedback resources, a feedback report based on receiving the MBMS transmission.

Abstract: Wireless communications systems and methods related to performing paging operations in a shared radio frequency band (e.g., in a shared spectrum or an unlicensed spectrum) with an improved paging reliability. A first user equipment (UE) determines a frequency hopping pattern for a paging occasion window (POW) in a plurality of frequency subbands within a shared radio frequency band. The first UE monitors for a paging message from a base station (BS) in the POW, where the monitoring includes hopping from at least a first frequency subband of the plurality of frequency subbands to a second frequency subband of the plurality of frequency subbands based on the frequency hopping pattern.

Abstract: Certain aspects of the present disclosure provide techniques for utilizing and processing repeated DCI transmissions that schedule common uplink or downlink transmissions. The techniques allow a UE to decide which repeated DCI to use for determining resources for the uplink or downlink transmissions.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may detect a physical downlink shared channel (PDSCH) transmission associated with a multi-PDSCH semi-persistent scheduling (SPS) that potentially conflicts with a second transmission in a slot. The UE may determine to keep at least one of the PDSCH transmission associated with the multi-PDSCH SPS or the second transmission in the slot based at least in part on one or more rules. The UE may perform, with a base station in the slot, at least one of the PDSCH transmission associated with the multi-PDSCH SPS or the second transmission that is kept based at least in part on the one or more rules. Numerous other aspects are described.

Abstract: A UE receives a configuration for a message A (Msg A) physical random access channel (PRACH) over a resource block (RB) set for a two-step random access channel (RACH) operation and receives one or more parameters for a Msg A physical uplink shared channel (PUSCH) configuration. The UE transmits a Msg A in a configured Msg A PRACH occasion and a Msg A PUSCH resource based on an RB set for the Msg A PRACH and the one or more parameters for the Msg A PUSCH configuration.

Abstract: Wireless communications systems and methods related to COT aware autonomous sidelink sensing are provided. A first user equipment (UE) selects at least a first resource from available resources in a sidelink resource pool within a shared radio frequency band. The selecting the first resource may be based on a channel-access gap preceding each resource of the available resources. The first UE further transmits, to a second UE using the selected first resource, one or more data blocks for a sidelink transmission.

Abstract: Methods, systems, and devices for wireless communications are described. In some aspects, a user equipment (UE) and a network entity may support one or more configuration- or signaling-based mechanisms according to which the network entity may configure one or more maxRank values and maximum number of ports values and according to which the UE may interpret one more downlink control information (DCI) fields to identify, ascertain, or otherwise determine information associated with a codebook (CB)-based uplink shared channel message. For example, the UE may support a first interpretation of DCI fields if a first quantity of maxRank values or maximum number of ports values are indicated and may support a second interpretation of DCI fields if a second quantity of maxRank values or maximum number of ports values are indicated.