A method, a terminal device, and a base station for power control in random access procedure. The method implemented at a terminal device includes: obtaining at least one power control parameter to be used for a request message for a random access; and transmitting, to a base station, the request message for the random access. A power of the request message for the random access is controlled based on the at least one power control parameter. The request message comprises: a random access channel (RACH) preamble and a physical uplink shared channel (PUSCH). The power control may be achieved in a RACH procedure different with 4-step RACH procedure, such as in a 2-step RACH procedure.

Methods, systems, and devices for wireless communications are described for radio frequency (RF) exposure limit compliance using uplink duty cycling. A user equipment (UE) may transmit a buffer status report (BSR) that indicates an amount of data that is to be transmitted by the UE, where lower priority data reported in the BSR may be throttled in order to reduce an amount of uplink resources associated with the lower priority data and thereby adjust an uplink duty cycle of the UE. The reduced uplink duty cycle may provide for additional transmit power that is available for higher priority data transmissions.

The disclosed method and an apparatus are directed to determine an uplink transmission power in in New Radio (NR) systems by a wireless transmit/receive unit (WTRU) for transmitting at least one physical uplink shared channel (PUSCH), using multiple beams toward multiple Tx/Rx points (TRPs). The method includes determining common parameters like a target receive power, a modulation and coding scheme (MCS) specific offset, and a transmit power control (TPC) command parameters common to the multiple beams. The method also includes determining beam-specific parameters like path loss for each beam, a configurable fractional power compensation factor for each beam, and a configurable maximum transmit power level of the each beam, wherein the fractional power compensation factor and the configurable maximum transmit power level for the each beam are determined dynamically or semi-statically based on at least deployment, WTRU mobility, or interference level. The method further includes transmitting at least one codeword to at least one receiving station using at least one of the multiple beams, which having a transmit power calculated based on the common parameters and the beam-specific parameters.

The present disclosure relates to a pre-5.sup.th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4.sup.th-Generation (4G) communication system such as Long Term Evolution (LTE). The present application discloses a power headroom report (PHR) method and apparatus. A user equipment (UE) determines a PHR reporting manner according to the structure of an uplink subframe in an active serving cell, calculates PHR according to the reporting manner, and sends the PHR to a base station. According to the present disclosure, a UE proactively determines the PHR reporting manner, calculates PHR and report the PHR, thus implements PHR reporting process at the UE.

A terminal according to one aspect of the present disclosure includes a control section that, when spatial relation information for uplink transmission, of any one of a physical uplink control channel (PUCCH) and a physical uplink shared channel (PUSCH) scheduled by downlink control information (DCI) format 0_1 is not configured, determines a power control parameter for the uplink transmission to determine transmit power for the uplink transmission on the basis of the power control parameter, and a transmitting section that performs the uplink transmission by using the transmit power. According to one aspect of the present disclosure, it is possible to appropriately transmit UL transmission.

Provided are a method by which a first device performs wireless communication, and a device for supporting same. The method can comprise the steps of: transmitting one or more reference signals (RSs) to a second device on the basis of first transmit power; receiving, from the second device, information related to a channel state measured on the basis of the one or more RSs; changing the first transmit power to second transmit power on the basis of the information related to the channel state; and transmitting the one or more RSs to the second device on the basis of the second transmit power.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit a report of a maximum transport block size supported by the UE for if hybrid automatic repeat request (HARQ) feedback is enabled and a maximum transport block size for is HARQ is disabled. The UE may receive, based at least in part on transmitting the report, one or more transport blocks that have a transport block size that does not exceed the maximum transport block sizes supported by the UE. In some aspects, the UE may receive an indication of a length of a span for receiving a set of bits from channel encoder output for a transport block or a redundancy version of a transport block. Numerous other aspects are provided.

A communications device transmits data in preconfigured resources of an uplink of a wireless communications network by performing a procedure to determine whether the communications device can transmit signals in the preconfigured resources of the uplink, and if the communications device determines that it can transmit signals in the preconfigured resources, transmitting signals representing the data in the preconfigured resources. The procedure to determine whether the communications device can transmit signals in the preconfigured resources of the uplink includes a transmission parameter confirmation procedure which confirms that a value of one or more transmission parameters to be used for transmitting the signals representing the data can be used for the signals representing the data to be detected by an infrastructure equipment of the wireless communications network.

Apparatuses, methods, and systems are disclosed for directional transmission/reception of groupcast and unicast communication. One apparatus includes a memory comprising instructions executable by a processor to cause the apparatus to receive a sidelink (“SL”) configuration for SL communication, the SL configuration indicating a SL grant and a physical uplink control channel (“PUCCH”) resource for hybrid automatic repeat request (“HARQ”) feedback. The instructions are executable by the processor to cause the apparatus to transmit a positive acknowledgement on the PUCCH resource based at least in part on the HARQ feedback being disabled.

An operating method of a wireless communication device configured to perform wireless communication with a cell. The method involves identifying, from a downlink signal received from the cell, an electromagnetic field state associated with an antenna of the wireless communication device. A power compensation mode for compensating transmission power of a sounding reference signal is selected based on the identified electromagnetic field state. The transmission power of the sounding reference signal is compensated based on the selected power compensation mode. The sounding reference signal is transmitted with the compensated transmission power through the antenna to the cell.