Disclosed are a method, an apparatus, and a system for performing channel access. In detail, provided are a method including: receiving uplink scheduling information; and when the user equipment has stopped an uplink transmission during the uplink transmission being performed according to the uplink scheduling information, to resume the uplink transmission, performing a second type channel access when a channel sensed by the user equipment is continuously idle after the uplink transmission has been stopped, and performing a first type channel access when the channel sensed by the user equipment is not continuously idle after the uplink transmission has been stopped, wherein the first type channel access comprises performing a random backoff after a channel sensing, and the second type channel access only comprises performing a channel sensing and an apparatus and a system therefor.

The present disclosure relates to a communication technique that merges IoT technology with a 5G communication system for supporting higher data transmission rates than 4G systems, and a system therefor. The present disclosure may be applied to intelligent services (for example, smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail business, security and safety-related services, etc.) on the basis of 5G communication technology and IoT-related technology. The invention of the present disclosure proposes a method and device for transmitting and receiving a reference signal for efficiently using resources in a wireless communication system.

The present disclosure relates to a communication technique for converging IoT technology with a 5G communication system for supporting a higher data transmission rate beyond a 4G system, and a system therefor. The present disclosure may be applied to an intelligent service (for example, a smart home, a smart building, a smart city, a smart car or connected car, health care, digital education, retail business, a security and safety-related service, etc.) on the basis of 5G communication technology and IoT-related technology. In addition, the present disclosure relates to a method and device for carrying out cooperative communication in a wireless communication system. A method of a terminal of a communication system, according to one embodiment of the present disclosure, comprises the steps of: receiving, from a base station associated with a first cell, cell configuration information including a TCI configuration and a QCL configuration; checking a QCL reference antenna port on the basis of the cell configuration information; and receiving a signal from the base station on the basis of a QCL relationship with the checked QCL reference antenna port, wherein the QCL reference antenna port may be checked on the basis of a CSI-RS or SSB associated with a second cell.

Apparatuses, methods, and systems are disclosed for transmitting a physical downlink shared channel after losing uplink synchronization. One method includes: transmitting first downlink control information that schedules a physical downlink control channel order; transmitting second downlink control information that schedules a physical downlink shared channel transmission; transmitting the physical downlink control channel order based on the first downlink control information; transmitting the physical downlink shared channel transmission based on the second downlink control information, wherein the physical downlink control channel order and at least a portion of the physical downlink shared channel transmission are transmitted after a remote unit loses an uplink synchronization and before the remote unit completes a physical random access channel procedure.

A method, performed by a network node, is disclosed, for configuring resources to be used for Wake-Up Signal, WUS, transmission to a plurality of wireless device groups in the communications network. The method comprises obtaining a number of wireless device groups supported by the communications network. The method comprises allocating, based on the obtained number of wireless device groups supported by the communications network, one or more active resources, out of a set of available resources, for WUS for the number of wireless device groups. The method comprises determining, based on a set of resource configuration criteria, a WUS resource configuration defining a mapping of the wireless device groups to the determined one or more active resources. The method comprises providing, to the wireless device, a set of resource configuration parameters indicative of the determined WUS configuration.

In some aspects, the disclosure is directed to methods and systems for overlapping orthogonal frequency-division multiple-access (OFDMA) channels for coexistence of devices and legacy devices, including DOCSIS 3.1 mid-split and high-split cable modems (CMs). Described are systems and methods for providing a CMTS with capability for managing overlapping OFDMA channels to support mid-split and high-split CMs, without modification to legacy CMs.

Methods and apparatuses for random access procedure. A method at a terminal device comprises receiving information of a physical uplink shared channel (PUSCH) resource allocation mode from a network node. The PUSCH resource allocation mode includes at least one of interlace or non-interlace. The method further comprises transmitting a first message including a random access preamble and payload to the network node. The payload is transmitted on a PUSCH based on the PUSCH resource allocation mode.

A method for a base station can create a subframe structure used in communication between the base station and a UE. The subframe structure can include a plurality of subframes each having a subframe duration. The method can include operating a serving cell on a carrier frequency. The method can include performing a LBT on the carrier frequency for a time duration that at least partially overlaps a terminal portion of a subframe duration of a first subframe of the plurality of subframes. The method can include determining a position of a starting OFDM symbol for transmitting a control channel in a second subframe of the plurality of subframes based on the time duration of the LBT. The subframe duration of the second subframe can occur immediately after the subframe duration of the first subframe.

A method and apparatus for performing autonomous transmission for performing collision mitigation and complexity reduction for non-orthogonal multiple access (NOMA) transmissions are disclosed. A wireless transmit/receive unit (WTRU) may receive a configuration with multiple SRs and associated preamble subsets, randomly select a preamble subset and select a SR configuration according to the randomly selected preamble subset based on the received configuration. The WTRU may transmit an SR associated with the selected preamble subset. Next the WTRU may select a preamble from the selected preamble subset, and transmit the selected preamble with a data transmission. Each SR associated with preamble subsets may be distinguished by time and frequency resources, sequence index value, or PUCCH index value.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may receive a set of indicators indicating that a first transmission is scheduled for concurrent transmission with a second transmission, wherein the user equipment is not configured to transmit the first transmission and the second transmission concurrently. The user equipment may select one of the first transmission or the second transmission for transmission based at least in part on a characteristic of at least one of the first transmission or the second transmission identified using the set of indicators. The user equipment may transmit the selected one of the first transmission or the second transmission based at least in part on selecting the one of the first transmission or the second transmission. Numerous other aspects are provided.