Various embodiments disclosed herein enable performing energy detection on a subset of a channel. In various embodiments, a method of performing energy detection is performed by a computing device. In various embodiments, the computing device includes a wireless transceiver, one or more processors, and a non-transitory memory. In various embodiments, the method includes performing energy detection on one or more overlapping portions of a first channel and a second channel. In some embodiments, the method includes determining whether a detected energy level from the energy detection satisfies a threshold. In some embodiments, the method includes transmitting a signal into the first channel based on the threshold being satisfied.

In one illustrative example, a device configured for use in a wireless local area network (WLAN) may cause a spatial reuse (SR) adjustment to be performed based on data received from a multi-user receiver procedure for the blind detection and demodulation of colliding packets from multiple stations. This procedure may be performed by one or more access points (APs) and/or distributed sensor nodes, each having such a multi-user receiver. The procedure may involve receiving and decoding, over a channel, a first spatial stream from a first device of a first base service set (BSS) color; simultaneously receiving and decoding, over the channel, a second spatial stream from a second device of a second BSS color (i.e. an overlapping BSS or “OBSS”); and calculating a signal-to-interference ratio (SIR) based on signal levels associated with the streams. The SR adjustment may involve adjusting an OBSS Packet Detect (PD) (OBSS-PD) threshold.

Disclosed are a method, an apparatus, and a system for transmitting a signal using multiple carriers. In detail, provided are a wireless communication apparatus including a communication module; and a processor, wherein the processor obtains a common back-off counter for a carrier set on which data is to be transmitted, wherein the carrier set includes at least one component carrier, performs back-off of each of the component carriers using the obtained common back-off counter, and simultaneously transmits data through at least one component carrier in which the back-off is completed and a wireless communication method using the same.

Methods, systems, and devices for wireless communications are described. A wireless device may implement one or more listen before talk (LBT) techniques. The wireless device may identify a set of transmission parameters of a signal for transmission from the wireless device. The wireless device may generate a first transmission waveform of the signal on a set of radio resources based on the set of transmission parameters. The wireless device may perform a LBT based at least in part on the generation of the first transmission waveform. In some cases, performing the LBT includes adjusting a detected signal associated with the set of radio resources based at least in part on the first transmission waveform. The wireless device may transmit the signal based on a result of the LBT.

A method embodiment includes implementing, by a base station (BS), a grant-free uplink transmission scheme. The grant-free uplink transmission scheme defines a first contention transmission unit (CTU) access region in a time-frequency domain, defines a plurality of CTUs, defines a default CTU mapping scheme by mapping at least some of the plurality of CTUs to the first CTU access region, and defines a default user equipment (UE) mapping scheme by defining rules for mapping a plurality of UEs to the plurality of CTUs.

Methods and apparatus may be used for sounding for multi-user (MU) scheduling and for signaling and procedures for sub-channel selection. A wireless transmit/receive unit (WTRU) may receive information from an access point (AP) indicating a plurality of sub-channels to use for uplink data transmission as part of uplink MU wireless communications using a carrier sense multiple access (CSMA) wireless medium. The WTRU may transmit, using a plurality of sub-channels, a Physical Layer Convergence Protocol (PLCP) Protocol Data Unit (PPDU) including a preamble portion and a data portion, and, using at least a subset of the plurality of sub-channels, sounding signals to the AP for scheduling MU communications. The AP may receive sounding information from more WTRUs that the plurality of WTRUS associated with the scheduling information for the uplink data transmission during a time interval, in addition to receiving uplink data from the plurality of WTRUs.

A user equipment (UE) may determine that a channel, such as a downlink channel or an uplink channel, and a positioning reference signal (PRS) occasion are scheduled for a common set of resources, such as a common frequency, a common time, and/or the like. This may result in the UE being unable to receive the PRS and/or process the PRS as a result of receiving the channel. In some aspects, the UE may determine that a PRS collides with a channel, and may perform a collision response action, such as dropping at least a portion of the channel, based at least in part on determining that the PRS occasion collides with the channel.

The present disclosure provides a method and device for determining an uplink-downlink switching point. The method is used in a base station. The method includes: setting configuration information for determining an uplink-downlink switching point; and sending the configuration information to the terminal, so that the terminal determines the uplink-downlink switching point according to the configuration information. Therefore, the present disclosure can prevent the terminal from performing invalid detection on an unlicensed carrier, and can also improve the speed and accuracy of determining the uplink-downlink switching point by the terminal.

Embodiments of this application provide a data transmission method, an apparatus, and a system, and relate to the field of communications technologies, to resolve a problem that two carriers cannot be deployed overlapping with each other. The method includes: determining a transmission time unit pattern corresponding to a slot set, where the transmission time unit pattern is used to indicate a symbol location at which a transmission time unit in a slot in the slot set is located, and a quantity of symbols included in the transmission time unit is less than a quantity of symbols included in the slot; and sending a notification message to a terminal device, where the notification message includes information about the slot set and information about the transmission time unit pattern, and the information about the transmission time unit is used to indicate the transmission time unit pattern.

Certain aspects of the present disclosure relate to methods and apparatus for collision handling in NR. In certain aspect, a method for use by a wireless communications device includes detecting a collision between resources allocated to different channels and initiating collision handling when processing the different channels based on the detection, wherein at least one of the detection or the processing is based on one or more characteristics of the different channels or the wireless device. In certain aspects, the one or more characteristics comprise at least one of one or more numerologies associated with at least one of the different channels, a modulation order of at least one of the different channels, coding rate of at least one of the different channels, or one or more capabilities of the wireless device.