A transmission measurement method includes: generating a measurement message frame that does not include a data part, in which the measurement message frame includes long training fields (LTFs) and the number of the LTFs is determined based on the number of antennas of an access point (AP); and transmitting the measurement message frame.

The present specification relates to a method for performing uplink transmission in a wireless communication system. More specifically, a method performed by a terminal comprises the steps of: transmitting, to a base station, a plurality of PRACH preambles related to a plurality of transmission units indicating a physical layer resource set; receiving, from the base station, a plurality of random access responses (RARs) corresponding to the plurality of PRACH preambles, wherein each of the plurality of RARs comprises a temporary cell (TC)-RNTI; and transmitting, to the base station, a plurality of uplink signals on the basis of the plurality of RARs, wherein the uplink signals comprise information on overlapped TC-RNTIs.

Some demonstrative embodiments include apparatuses, devices, systems and methods of communicating an Enhanced Directional Multi-Gigabit (DMG) (EDMG) Physical Layer Protocol Data Unit (PPDU). For example, an EDMG wireless communication station (STA) may be configured to communicate an EDMG PPDU including a Channel Estimation Field (CEF) and/or a pilot sequence, which may be configured for an OFDM mode.

An apparatus configured to be employed in a gNodeB associated with a new radio (NR) system is disclosed. The apparatus comprises one or more processors configured to configure one or more sidelink sounding reference signals (SRS), for one or more user equipments (UEs) associated with the gNodeB, to be utilized by the one or more UEs for transmission or reception, or both, over sidelink. The one or more processors is further configured to generate one or more sidelink SRS configuration signals to be provided, respectively, to the one or more UEs, wherein each sidelink SRS configuration signal comprises sidelink SRS configuration information on the one or more sidelink SRS configured for a respective UE. The apparatus further comprises a radio frequency (RF) interface, configured to provide, to a radio frequency (RF) circuitry, the one or more sidelink SRS configuration signals, for subsequent transmission to the one or more UEs, respectively.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine whether an uplink communication for a first radio access technology (RAT) has been dynamically scheduled or semi-statically configured, wherein the UE is in a dual connectivity mode using the first RAT and a second RAT. The UE may identify an uplink subframe for transmission of the uplink communication based at least in part on whether the uplink communication has been dynamically scheduled or semi-statically configured, and based at least in part on a downlink-reference uplink-downlink configuration. The UE may transmit the uplink communication in the identified uplink subframe. Numerous other aspects are provided.

Disclosed are a wireless transmitter and a reference signal transmission method that improve channel estimation accuracy. In a terminal, which transmits a reference signal using n (n is a non-negative integer 2 or greater) band blocks (which correspond to clusters here), which are disposed with spaces therebetween in a frequency direction, a reference signal controller switches the reference signal formation method of a reference signal generator between a first formation method and a second formation method based on the number (n) of band blocks. In addition, a threshold value setting unit adjusts a switching threshold value based on the frequency spacing between band blocks. Thus, the reference signal formation method can be selected with good accuracy and, as a result, channel estimation accuracy is further improved.

A method for transmitting a reference signal in a multi-antenna system is provided. The method includes: selecting at least one orthogonal frequency division multiplexing (OFDM) symbol in a subframe containing a plurality of OFDM symbols; allocating a channel quality indication reference signal (CQI RS) capable of measuring a channel state for each of a plurality of antennas to the selected at least one OFDM symbol; and transmitting the CQI RS, wherein the CQI RS is allocated to an OFDM symbol which does not overlap with an OFDM symbol to which a common reference signal to be transmitted to all user equipments in a cell or a dedicated reference signal to be transmitted to a specific user equipment in the cell is allocated.

This disclosure provides systems, methods, and apparatus for wireless communications that support fast user equipment (UE) handover between base stations. A UE may receive, from a source base station, a configuration for reference signal transmission at a set of uplink transmit power levels. The UE may transmit multiple uplink reference signal repetitions based on the configuration. The source base station may transmit a request message to a target base station to measure the multiple uplink reference signal repetitions. The target base station may select an uplink reference signal and measure a transmit power correction. The target base station may transmit an indication to the source base station of the selection and transmit power correction. The source base station may evaluate the indications and select the target base station. The source base station may forward to the indicated contents, and the UE may switch and synchronize with the target base station.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive synchronization signal block (SSB) information that indicates, for each respective SSB of one or more SSBs, a quantity of how many beams are associated with the respective SSB. The UE may monitor SSBs, determine one or more beams that provide an SSB based at least in part on the SSB information, and direct one or more reception beams toward the one or more beams. Numerous other aspects are provided.

Systems and methods relating to frequency-selective Sounding Reference Signal (SRS) precoding and uplink transmission are disclosed. In some embodiments, a method of operation of a wireless device comprises transmitting SRS on a first set of frequency-domain resources, and receiving an uplink scheduling assignment for an uplink physical channel comprising a resource allocation of a second set of frequency-domain resources comprising: (a) one or more frequency-domain resources that are also included in the first set and (b) one or more frequency-domain resources that are not included in the first set. In order to form a precoded uplink channel, the method further comprises: for each frequency-domain resource in (a), applying a same precoding as applied to the SRS on the frequency-domain resource; and, for each frequency-domain resource in (b), applying a same precoding as applied to the SRS on a different frequency-domain resource. The method further comprises transmitting the precoded uplink channel.