One disclosure of the present application provides a method for a narrowband (NB) wireless device to determine whether or not to transmit a scheduling request (SR). The method may comprise a step of determining whether or not to transmit an SR by using a resource for the transmission of a hybrid automatic retransmit request (HARQ) acknowledgement/negative acknowledgement (ACK/NACK) signal. The step of determination may be performed if one or more HARQ processes are run. The resource for the HARQ ACK/NACK signal may include a narrowband physical uplink shared channel (NPUSCH).

Techniques are described for wireless communication. One method includes transmitting a sequence of deterministic variations of random access data on at least one interlace of non-contiguous frequency resources allocated to a physical random access channel (PRACH) in an unlicensed spectrum, beginning at a first time; repeating the transmitting of the sequence of deterministic variations of random access data at least once, beginning at a second time; generating at least one modification of the sequence of deterministic variations of random access data, in which the at least one modification is generated according to a modification sequence; and transmitting on the at least one interlace, beginning at a third time, the at least one modification of the sequence of deterministic variations of random access data.

The present specification discloses a method for transmitting and receiving a signal in a WLAN system, by a station, and a device therefor. More particularly, the present specification discloses, when a station transmits and receives a signal through a channel on which one or two channels are bonded, a method for constituting an enhanced directional multi gigabit (EDMG) short training field (STF) for an orthogonal frequency division multiplexing (OFDM) packet, and transmitting and receiving a signal comprising the constituted EDMG STF field, and a device therefor.

A repeater generates repetition signals by repeating an uplink signal over a plurality of subframes. If the plurality of subframes do not include a transmission candidate subframe of a sounding reference signal used to measure uplink reception quality, a controller sets a first transmission format to all the plurality of subframes, and if the plurality of subframes include the transmission candidate subframe, the controller sets a second transmission format to all the plurality of subframes. A transmitter transmits the repetition signals using the set transmission format.

The disclosure is related to a receiving device, a transmitting device, a communication method, and medium. The receiving device comprises processing circuitry configured to: receive a reference signal from a transmitting device, wherein the reference signal carries a reference sequence generated based on an orthogonal sequence and a random sequence associated with the transmitting device; and identify the transmitting device based on the reference signal.

Sounding reference signals (SRS) transmitted by a UE, e.g., for positioning or channel estimation, may be configured for one or both of frequency tone level cyclic shift and symbol level code, which, for example, enables multiplexing a greater number of UEs. The frequency tone level cyclic shift is produced by jointly processing a number of symbols with an extended cyclic shift structure. The SRS may be configured using a symbol group level that indicates the number of symbols associated with a cyclic shift structure, and an outer code that indicates a multiplier applied to the SRS at the symbol level, which increases the multiplexing opportunities. The symbol level code may further indicate an extended cyclic shift indicating a linear increase in phase rotation across tones in symbols associated with the symbol group level.

Methods and systems are disclosed for reducing control signaling in uplink transmissions. A device, such as a wireless transmit/receive unit, may determine to use a demodulation reference signal (DM-RS) transmission schedule out of a plurality of DM-RS transmission schedules. The DM-RS transmission schedule may be characterized by a DM-RS transmission being mapped to a single orthogonal frequency-division multiplexing (OFDM) symbol per subframe of a data stream. The DM-RS transmission schedule may be characterized by a DM-RS transmission being mapped to a first subset of subcarriers of an OFDM symbol of a subframe of a data stream and Physical Uplink Shared Channel (PUSCH) transmission or Physical Uplink Control Channel (PUCCH) control information being mapped to a second set of subcarriers of the OFDM symbol. The first set of subcarriers may be different than the second set of subcarriers. The data stream may be transmitted according to the DM-RS transmission schedule.

This application provides a method for determining a reference signal sequence, a terminal device, and a network device. The method includes: receiving, by a terminal device, first indication information sent by a network device; determining, by the terminal device, a target resource based on the first indication information; determining, by the terminal device, a reference signal sequence based on parameters of a first bandwidth and parameters of a second bandwidth; and sending or receiving, by the terminal device, the reference signal sequence on the target resource. Based on the method for determining a reference signal sequence provided in this application, the reference signal sequence can be determined based on the parameters of the first bandwidth and the parameters of the second bandwidth.

A radio transmission device includes a transmitter (209) and a controller (203). The transmitter (209) transmits a radio signal in which a demodulation reference signal is mapped. When a plurality of the demodulation reference signals are to be mapped respectively to first and second unit resources consecutive in a time domain of the radio signal, the controller (203) applies the same sequence to each of the plurality of the demodulation reference signals to be mapped to the first and the second unit resources.

A method and apparatus are provided for reducing the number of pilot symbols within a MIMO-OFDM communication system, and for improving channel estimation within such a system. For each transmitting antenna in an OFDM transmitter, pilot symbols are encoded so as to be unique to the transmitting antenna. The encoded pilot symbols are then inserted into an OFDM frame to form a diamond lattice, the diamond lattices for the different transmitting antennae using the same frequencies but being offset from each other by a single symbol in the time domain. At the OFDM receiver, a channel response is estimated for a symbol central to each diamond of the diamond lattice using a two-dimensional interpolation. The estimated channel responses are smoothed in the frequency domain. The channel responses of remaining symbols are then estimated by interpolation in the frequency domain.