When arranging a reference signal generated by a pseudorandom number on specified time and frequency, an information processing unit (101) determines whether or not to arrange a 1 OFDM symbol or 2 OFDM symbols including a reference signal at a position determined in each slot, and determines whether or not to additionally arrange an OFDM symbol including a reference signal in the same slot. A multiplexing unit (108) performs multiplexing of a reference signal in accordance with the determination by the information processing unit (101).

Methods and apparatuses are disclosed for flexible reconfiguration of the sounding reference signal (SRS). In one embodiment, a method implemented in a network node includes signaling a sounding reference signal (SRS) configuration, the SRS configuration including an SRS configuration parameter that indicates whether to use one of a staggered comb and a non-staggered comb for an SRS transmission; and receiving the SRS transmission according to the one of the staggered comb and the non-staggered comb indicated by the SRS configuration parameter. In one embodiment, a method implemented in a WD includes receiving a SRS configuration, the SRS configuration including an SRS configuration parameter that indicates whether to use one of a staggered comb and a non-staggered comb for an SRS transmission; and transmitting the SRS transmission according to the one of the staggered comb and the non-staggered comb indicated by the SRS configuration parameter.

A communication apparatus includes a circuitry and a transmitter. In operation, the circuitry generates a Demodulation Reference Signal (DMRS) and generates downlink control information indicating a mapping pattern of the DMRS from a plurality of mapping patterns, and the transmitter transmits the DMRS and the downlink control information. The plurality of mapping patterns include a first mapping pattern and a second mapping pattern. Resource elements used for the DMRS of the second mapping pattern are same as a part of resource elements used for the DMRS of the first mapping pattern. A number of the resource elements used for the DMRS of the first mapping pattern is larger than a number of the resource elements used for the DMRS of the second mapping pattern.

Adaptive guard interval calibration may be provided. A computing device may receive a first plurality of delay spread values. Each of the first plurality of delay spread values may respectively comprise an amount of time between when each of a respective first plurality Access Points (APs) receives a first tuning symbol from a first calibrating AP and when each of the respective first plurality APs receives a final multipath reflection of the first tuning symbol. Next, a first Guard Interval (GI) may be determined based on the first plurality of delay spread values. The first calibrating AP may then be provisioned with the first GI.

Provided is a base station, comprising: a configuration unit, configured to configure a transmission waveform of a User Equipment (UE) for uplink transmission; and a transmission unit, configured to transmit information related to the configuration to the UE. The configuration unit is configured by using any of the following modes: physical layer signaling, a Random Access Response (RAR) message of Media Access Control (MAC), and Radio Resource Control (RRC) signaling. The present application also provides a user equipment (UE) and a corresponding method.

Methods and apparatuses are disclosed for communicating to a wireless device (WD) a DL-to-UL frequency offset (or frequency shift) that may need to be applied. For example, a method implemented in a wireless device (WD) is provided. The method comprises: receiving, from the network node, an indication of a frequency offset; and applying the received frequency offset; wherein the WD is configured to operate on a narrow-band Internet of Things (NB-IoT) carrier in a New Radio (NR) carrier.

Apparatus and methods for sounding reference signal (SRS) switching are provided. In certain embodiments, transmit path resources of user equipment (UE) are used to reduce or eliminate the impairment of SRS upon transport capacity. Furthermore, the transmit path resources can be used for other purposes, and thus SRS switching time can be reduced by re-using transmit path resources that may be included for other purposes. The teachings herein can be used to achieve SRS switching of 0 μs, thereby eliminating the impact of switching timing constraints for SRS symbols on transport capacity.

Methods, systems, and devices for wireless communications are described. Some systems may support wireless communications in high frequency millimeter wave (mmW) bands, such as frequency range 4 (FR4) or other frequency ranges. To support such communications, a base station may dynamically configure a cyclic prefix (CP) length for single carrier waveform communications. The base station may determine the CP length to handle a beam switching delay, a delay spread of a physical propagation channel, or both. In some examples, a user equipment (UE) may provide feedback to the base station, and the base station may configure the UE with a CP length based on the feedback. The base station may transmit a configuration message to a UE indicating the configured CP length. A single carrier waveform with the configured CP length may maintain a symbol-level alignment with other supported waveforms, such as orthogonal frequency division multiplexing (OFDM) waveforms.

Adaptive guard interval calibration may be provided. A computing device may receive a first plurality of delay spread values. Each of the first plurality of delay spread values may respectively comprise an amount of time between when each of a respective first plurality Access Points (APs) receives a first tuning symbol from a first calibrating AP and when each of the respective first plurality APs receives a final multipath reflection of the first tuning symbol. Next, a first Guard Interval (GI) may be determined based on the first plurality of delay spread values. The first calibrating AP may then be provisioned with the first GI.

There is disclosed a method of operating a radio node in a wireless communication network, the method comprising communicating utilising a first beam pair based on a timing indication, the timing indication being based on first signaling received utilising the first beam pair and second signaling received utilising a second beam pair.