Abstract: An apparatus for wireless communication receives information enabling one or more repetitions of an uplink message associated with a network access procedure, wherein a maximum bandwidth allocated to the apparatus is less than a bandwidth of an initial uplink bandwidth part of the apparatus, receives a frequency hopping indication for the one or more repetitions of the uplink message, and transmits the uplink message and the one or more repetitions of the uplink message in different slots using inter-slot frequency hopping based on at least the information and the frequency hopping indication, wherein the inter-slot frequency hopping includes multiple sub-bands of the initial uplink bandwidth part, and wherein a single sub-band of the multiple sub-bands is used in each of the different slots.

Abstract: In a probabilistic amplitude shaping (PAS) system, a distribution matching (DM) component may receive a uniform bit sequence with equal probabilities, which may be converted into symbols with a desired probability distribution (e.g., Gaussian). For example, the probability distribution may use inner constellation points associated with a lower energy and/or power more frequently and outer constellation points associated with a higher energy and/or power less frequently. In general, the DM component may map binary bits to positive amplitudes with a non-uniform distribution according to a DM rate that is based at least in part on a signal-to-noise ratio (SNR), which may vary significantly in a spatial and frequency selective wireless channel. Accordingly, some aspects described herein relate to configuring DM parameters and codeword and resource mappings in a spatial and frequency selective wireless channel.

Abstract: The described techniques enable repeated physical random access channel (PRACH) preamble transmissions across multiple random access occasions (ROs) using a same spatial filter. A user equipment (UE) may transmit a PRACH preamble across multiple ROs, where each RO is associated with a same synchronization signal block (SSB) or channel state information reference signal (CSI-RS). The PRACH repetitions may be transmitted in ROs in accordance with a first mapping rule: first, in increasing order of frequency resource index; second, in increasing order of a time resource index; third, in increasing order of PRACH slot indices; and fourth, in increasing order of PRACH association period indices. Additionally, or alternatively, the PRACH repetitions may be transmitted in ROs in accordance with a second mapping rule: first, in increasing order of time resource index; second, in increasing order of PRACH slot indices; and third, in increasing order of PRACH association period indices.

Abstract: Methods, systems, and devices for wireless communication are described. In some systems, a first network node may transmit a first synchronization signal block (SSB) associated with a first spatial filter and a first set of random access occasions within a respective instance of a random access occasion window and a second SSB associated with a second spatial filter and a second set of random access occasions that overlap in time with the first set of random access occasions during the random access occasion window. A second network node may receive the SSBs and transmit instances of a random access message during one or more instances of the random access occasion window using the first spatial filter, the second spatial filter, or both based on a rule for random access message multiplexing when random access occasions associated with different spatial filters to be used for random access messages overlap in time.

Abstract: This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for hybrid automatic repeat request (HARQ) designs for probabilistic amplitude shaping (PAS). In some aspects, a device may construct a first buffer including a set of shaped bits and a second buffer including a set of non-shaped bits, the first buffer including a first set of shaped information bits and the second buffer including a second set of non-shaped information bits and a set of non-shaped parity bits. The device may transmit a first instance of a data message using a complete set bits from the first buffer and a first subset of bits from the second buffer. The device may transmit a second instance of the data message using at least one of a subset of bits from the first buffer or a second subset of bits from the second buffer.

Abstract: In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a user equipment (UE) or a component thereof. The apparatus may be configured to receive a random access channel (RACH) configuration for a RACH procedure with a network node. The apparatus may be further configured to determine a set of spatial domain filters for the RACH procedure based on the RACH configuration, and each respective spatial domain filter of the set of spatial domain filters corresponds to a respective reference signal of a set of reference signals. The apparatus may be further configured to perform the RACH procedure, and to perform the RACH procedure, the apparatus may be configured to transmit, to the network node, a plurality of preamble messages using the set of spatial domain filters based on the RACH configuration.

Abstract: Certain aspects of the present disclosure provide techniques for a probabilistic constellation shaping (PCS) scheme for multiple layer transmissions. An example method includes obtaining a configuration for performing a PCS modulation scheme, identifying a set of bits corresponding to a transport block for communication via the multi-layer transmission, performing distribution matching on the set of bits using a set of parameters indicated in the configuration to obtain a set of distributed symbols, converting the set of distributed symbols into a set of distributed bits, encoding the set of distributed bits to obtain an encoded set of distributed bits, performing a modulation procedure on the encoded set of distributed bits in accordance with the PCS modulation scheme to obtain a set of modulation symbols corresponding to a codeword associated with the transport block, and transmitting, to a receiving device, the codeword, including the set of modulation symbols, via the multi-layer transmission.

Abstract: In a wireless network, a user equipment (UE) determines, for a channel between each such TRP and the UE, a set of channel characteristics (HTRP). The UE then determines a set of pre-coder (WTRP) recommendations for each such channel based on a corresponding HTRP. The UE selectively decomposes the WTRP recommendations in both a spatial domain (SD) and a frequency domain (FD) into SD coefficients and FD coefficients based on one or more SD bases and one or more FD bases. Then the UE transmits the spatial domain coefficients and frequency domain coefficients to the network/base station.

Abstract: A method of wireless communication performed by a user equipment (UE) includes receiving, from a base station (BS), a random access configuration associated with a plurality of random access occasions, wherein at least a first portion of the plurality of random access occasions is configured for PRACH message repetitions. The method further includes transmitting, to the BS based on the random access configuration, at least one random access communication, the at least one random access communication including a plurality of PRACH message repetitions in two or more of the plurality of random access occasions, wherein at least one of a random access occasion index associated with the at least one random access communication or the random access preamble indicates the at least one random access communication includes at least two PRACH message repetitions.

Abstract: Methods, systems, and devices for wireless communications are described. A transmitting device may perform distribution matching on at least a first subset of a set of bits, such as the bits of transport block. The distribution matching may include a variable-to-fixed (v2f) distribution matching procedure in which a ratio between a quantity of input bits to output interim symbols for the v2f distribution matching procedure is variable. The distribution matching include evaluating, after each instance of the v2f distribution matching procedure, whether additional bits remain for distribution matching, and if so, whether to perform an additional instance of the v2f distribution matching procedure or an alternative distribution matching procedure on the remaining bits. Corresponding techniques for a receiving device are also described, including distribution dematching techniques based on a v2f distribution dematching procedure.

Abstract: This disclosure provides systems, methods, and devices for wireless communication that support joint transmission operations which include non-coherent and coherent joint transmissions. In a first aspect, an apparatus includes at least one processor and a memory coupled to the at least one processor. The at least one processor is configured receive an indication of channel state information (CSI) reference signal (RS) (CSI-RS) resources and transmit a CSI report based on the CSI resources. The CSI report includes precoding information and channel quality information. The at least one processor is configured to receive an indication of a joint transmission including a non-coherent joint transmission and a coherent joint transmission. The at least one processor is configured to receive the joint transmission corresponding to the indication. 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 receive one or more synchronization signal blocks (SSBs) associated with a random access channel (RACH) procedure, wherein the one or more SSBs are associated with an uplink physical random access channel (PRACH) transmission in a particular time resource. The UE may receive a downlink transmission, which at least partially overlaps with the uplink PRACH transmission, in the particular time resource, wherein the uplink PRACH transmission is dropped to receive the downlink transmission in the particular time resource, and wherein whether a quantity of configured PRACH transmissions includes the dropped PRACH transmission is based at least in part on a parameter. Numerous other aspects are described.

Abstract: A user equipment (UE) receives control signaling for an uplink (UL) multiple input multiple output (MIMO) transmission and transmits the UL MIMO transmission precoded with an 8 port uplink MIMO precoder based on the control signaling and a set of two or more antenna port groups.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a configuration of a power mode for transmitting eight uplink transmission chains, wherein the power mode is one of a full-power mode or a non-full-power mode, and wherein at least a first set of precoding matrices is associated with the full-power mode and at least a second set of precoding matrices is associated with the non-full-power mode. The UE may receive an indication of a selected precoding matrix, wherein the indication is based at least in part on the configuration of the power mode and one of the first set of precoding matrices or the second set of precoding matrices. The UE may transmit the eight uplink transmission chains based at least in part on the selected precoding matrix. Numerous other aspects are described.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a first message that indicates an inter-band carrier aggregation configuration. The inter-band carrier aggregation configuration may identify a set of carriers for carrier aggregation communication between the UE and a network entity. The UE may receive a second message that indicates a random access procedure configuration. The random access procedure configuration may include a rule pertaining to whether RACH messages may be transmitted over multiple carriers, a mapping of multiple of RACH occasions to at least one SSB index, and a repetition number that indicates a quantity of RACH message repetitions for transmission by the UE. The UE may transmit the quantity of RACH message repetitions based on the mapping. The quantity of RACH messages may be transmitted over one carrier or over the multiple carriers of the set of carriers based on the rule.

Abstract: Methods, systems, and devices for wireless communication at a communication device are described. The communication device may be configured to support reporting of power imbalances between antennas of the communication device. In some cases, the communication device may report a power imbalance between at least two of the antennas in the form of a power offset value based on a respective antenna polarization. In other cases, the communication device may report the power imbalance between the at least two antennas in the form of a power offset value based on a respective antenna panel. In some other cases, the communication device may be configured to report the power imbalance between the at least two antennas in the form of a power offset value for each separate antenna. The communication device may transmit a report with an indication of the power imbalance (e.g., power offset value) to the network.

Abstract: The described techniques enable repeated physical random access channel (PRACH) preamble transmissions across multiple random access occasions (ROs) using a same spatial filter. A user equipment (UE) may transmit a PRACH preamble across multiple ROs, where each RO is associated with a same synchronization signal block (SSB) or channel state information reference signal (CSI-RS). In such cases, the PRACH repetitions may be transmitted in ROs in accordance with a mapping rule: first, in increasing order of frequency resource index; second, in increasing order of a time resource index; third, in increasing order of PRACH slot indices; and fourth, in increasing order of PRACH association period indices. Additionally, or alternatively, the PRACH repetitions may be transmitted in ROs in accordance with a mapping rule: first, in increasing order of time resource index; second, in increasing order of PRACH slot indices; and third, in increasing order of PRACH association period indices.

Abstract: Methods, systems, and devices for wireless communication at a user equipment (UE) are described. A UE may receive an indication of a set of random access occasions associated with a random access procedure. The UE may transmit a set of uplink random access channel messages over the set of random access occasions corresponding to the set of uplink random access channel messages. The UE may select a radio network temporary identifier for the UE based on a defined position within the set of random access occasions and receive a downlink random access channel message using the radio network temporary identifier based on the defined position within the set of random access occasions.

Abstract: Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive, from a network entity, a downlink message associated with a first random access channel (RACH) procedure between the network entity and the UE, the downlink message including an accessibility indicator of a first cell supported by the network entity, the accessibility indicator indicating whether the first cell is inactive at a future time period. The UE may perform one of the first RACH procedure for the first cell based at least in part on the accessibility indicator indicating that the first cell supported by the network entity is active at the future time period or a second RACH procedure for a second cell based at least in part on the accessibility indicator indicating that the first cell supported by the network entity is inactive at the future time period.

Abstract: Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit, to a network entity, multiple physical random access channel (PRACH) transmissions based at least in part on a PRACH slot frequency hopping. The UE may receive, from the network entity, a response based at least in part on the multiple PRACH transmissions associated with the PRACH slot frequency hopping. Numerous other aspects are described.