A method for transmitting a physical layer protocol data unit (PPDU) and a device using the same are provided. The device receives a trigger frame for requesting a transmission of a high efficiency (HE) trigger-based (TB) PPDU and transmits the HE TB PPDU. A duration of the HE TB PPDU is calculated based on a duration of the trigger frame.

The application provide an access method, including: sending, to an access point, a first frame that carries uplink transmission requirement information; and if a second frame that carries information about an uplink transmission resource is received from the access point within agreed time period, sending uplink multi-user transmission data to the access point, where the uplink multi-user transmission data is transmitted on the uplink transmission resource; or if the second frame is not received within an agreed time period, accessing, by a station, a channel in a contention access manner that is based on carrier sense CSMA/CA.

The present disclosure provides a random access method, a terminal, and a network device. The random access method of the present disclosure comprises: receiving configuration information concerning a currently activated downlink bandwidth part (BWP) or a serving cell; detecting a random access response (RAR) in a random access procedure according to the configuration of a control resource set (CORESET) in the configuration information of the currently activated downlink BWP or the configuration information of the serving cell.

Methods and devices for grant-free uplink transmission in unlicensed spectrum are provided. A base station (BS) transmits grant-free resource configuration information to one or more electronic devices (EDs). The grant-free resource configuration information is used to configure the ED for GF uplink transmission in unlicensed spectrum. The GF resource configuration information includes GF ED group-specific resource configuration information indicating GF ED group-specific time-frequency (T/F) resources of the unlicensed spectrum for GF uplink transmission. The ED(s) transmit grant-free uplink transmissions over the unlicensed spectrum in accordance with the GF resource configuration information.

The present disclosure relates to a communication method and system for converging a 5.sup.th-Generation (5G) communication system for supporting higher data rates beyond a 4.sup.th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present disclosure provides a method for transmitting uplink signals, a user equipment (UE), and a base station. The UE determines an LBT type and a starting position of signal transmission according to scheduling information and LBT type of a previous subframe, a current subframe, and a subsequent subframe and whether there is a gap between these subframes.

A wireless device receives configuration parameters indicating: a plurality of a channel occupancy time (COT) parameters of a COT of a cell; and a position parameter for the COT of the cell. A downlink control information (DCI) comprising a plurality of fields is received. The position parameter indicates a position of a field, of the plurality of fields. The field indicates a COT parameter, of the plurality of COT parameters. A transport block is transmitted via uplink resources of the COT with the COT parameter.

A WLAN AP includes an array of antennas, a transceiver and a processor. The transceiver is configured to transmit via the array of antennas downlink packets to WLAN STAs, and to receive uplink packets from the STAs. The processor is coupled to the transceiver and is configured to send a request to a plurality of the STAs to transmit a respective plurality of channel-sounding packets corresponding to the plurality of STAs, to receive the plurality of channel-sounding packets from the plurality of STAs in response to the request, to compute, based on the received plurality of channel-sounding packets, a beamforming matrix that defines subsequent transmission beams aimed toward at least a subset of the plurality of STAs, and to transmit one or more downlink data packets to one or more of the STAs via the array of antennas, in accordance with the beamforming matrix.

An communication apparatus of the present disclosure comprises a receiver that receives a Trigger frame for allocating resource units (RUs) for random access and another frame including Random Access parameter element that comprises a first field indicating an OFDMA contention window (OCW) minimum value (OCWmin) and a second field indicating an OCW maximum value (OCWmax); and control circuitry that controls Uplink OFDMA-based Random Access (UORA) procedure using the OCWmin and the OCWmax.

Configuration parameters for a wireless device may comprise an energy detection threshold offset that may be used to adjust an energy detection threshold of an listen-before-talk (LBT) procedure. One or more transmissions may be based on the LBT procedure indicating a clear channel. The one or more transmissions may start from a configured starting position.

Provided is a radio communication base station device which can suppress a use amount of an SRS communication resource. In this device, a correlation rule setting unit (102) sets a rule for correlating a preamble with an SRS transmission time interval so that the preamble transmission time band and the SRS transmission time band are in the same transmission time band. An SRS transmission band decision unit (103) decides a time interval of a transmission time band which can transmit the SRS according to the preamble transmission time interval inputted from a preamble transmission band decision unit (101) and the correlation rule setting unit (102).