A wireless communication device is described. The wireless communication device includes a transmitter configured to transmit a first frame including first information required for uplink multi-user transmission without receiving a transmission request for the first information. The wireless communication device includes a receiver configured to receive a second frame. A wireless communication terminal is also described.

According to one embodiment, a transmission device includes an insertion unit, an allocation unit, a division unit, an IFFT unit, a phase rotation unit, and a transmission unit. The phase rotation unit performs a phase rotation to reduce a PAPR characteristic for each block on which inverse fast Fourier transform has been performed. The transmission unit combines transmission signals, on each of which a phase rotation has been performed by the phase rotation unit, and transmits the combined transmission signal to an external device. In addition, the division unit includes a predetermined band and at least one pilot symbol located outside another of end of this predetermined band on an opposite side of the one end into one block.

This application provides a reference signal indication method and apparatus. The method includes: transmitting, by a terminal device, a PTRS to a network device based on a time domain density; and receiving, by the network device, the PTRS transmitted by the terminal device based on the time domain density, where the time domain density is a density in a discrete Fourier transform spread orthogonal frequency division multiplexing DFT-s-OFDM waveform. Therefore, successful PTRS transmission can be ensured.

A power headroom transmission method and a device are provided. The transmission method is applied to a terminal device that supports use of two different types of waveform for data transmission, the terminal sends a first power headroom information and .sub.M, wherein the first power headroom information is used to indicate power headroom of the terminal device when data is transmitted by using the first waveform, .sub.M is a difference between a first maximum power and a second maximum power of the terminal device, the first maximum is a maximum power when using the first waveform, the second maximum is a maximum power when using the second waveform.

Methods, systems, and devices for wireless communications are described that support frequency and time domain multiplexing for low peak-to-average waveforms with multiple streams. A user equipment (UE) may identify sets of symbols associated with different streams (e.g., multiple single-carrier discrete Fourier transform (DFT)-spread waveforms), where each stream may be associated with a low peak-to-average power ratio (PAPR). In some cases, different waveforms may be mapped to subsets of frequency resources through frequency division multiplexing (FDM). The UE may further reduce the PAPR of the multiplexed waveforms by performing time division multiplexing (TDM) across the single-carrier streams, and sets of symbols that are not used by one waveform may be used by another waveform. Frequency domain phase ramps may be applied to align the multiplexed waveforms. Signals included in an uplink transmission according to these techniques may maintain properties similar to single-carrier waveforms, including a low PAPR.

Techniques and apparatus for transmission and reception with partial allocation in orthogonal frequency division multiple access (OFDMA)/single-carrier frequency division multiple access (SC-FDMA) systems are provided. One technique includes determining first parameter(s) to apply to transmission/receive processing of a signal, based in part on a resource allocation for the signal. The resource allocation is partitioned out of a larger system bandwidth. Second parameter(s) to apply to the transmission/receive processing are determined based at least in part on the first parameter(s). Transmission/receive processing of the signal is performed in accordance with the first and second parameters.

Systems and methods are described herein for communications bandwidth enhancement using Orthogonal Spatial Division Multiplexing (OSDM). For example, large sparse antenna arrays may be able to distinguish between signals emitted by multiple nearly collocated antennas, even if the signals have the same frequency, polarization, and coverage. Thus, the use of a large sparse antenna array may be able to resolve/isolate individual antennas on a single platform, allowing for OSDM, analogous to Orthogonal Frequency Divisional Multiplexing (OFDM). Using OSDM, multiple antennas on the same vehicle are able to reuse the same frequencies/polarizations without interference, thereby increasing spectrum availability while still providing the same transmitter power spectral density and total RF power emission.

A user terminal is disclosed that includes a transmitter that transmits uplink control information (UCI) using an uplink control channel and a processor that controls at least one of generation and transmission of the UCI based on a spreading factor of the uplink control channel. Additionally, at least one of a number of symbols and a position of a demodulation reference signal for the uplink control channel is fixed irrespective of the spreading factor.

A 5.sup.th generation (5G) or pre-5G communication system supporting higher data rate after a 4.sup.th generation (4G) communication system such as a long-term evolution (LTE) is disclosed. The system includes a scalable frame structure to integrally support various services in a cellular wireless communication system, and provides a transmission/reception method to which the corresponding frame structure is applied, so that the system performance is improved through minimizing of inter-symbol interference between the 5G system and the LTE system or between the 5G systems. The scalable frame structure adjusts a cyclic prefix (CP) length by giving a specific pattern thereto when subcarrier spacing is extended, while maintaining a CP overhead in the same manner based on the frame structure based on a specific subcarrier spacing, thereby maintaining the 2.sup.m-times relationship between a symbol length, CP length, slot length, and subframe length.

Embodiments provide a measurement configuration method and apparatus. A first network device determines measurement configuration information of a first beam and/or a second beam and sends the measurement configuration information of the first beam and/or the second beam to first UE, and the first UE measures a first reference signal and/or a second reference signal based on the measurement configuration information.