Provided are a method by which a first device performs wireless communication, and a device for supporting same. The method can comprise the steps of: transmitting one or more reference signals (RSs) to a second device on the basis of first transmit power; receiving, from the second device, information related to a channel state measured on the basis of the one or more RSs; changing the first transmit power to second transmit power on the basis of the information related to the channel state; and transmitting the one or more RSs to the second device on the basis of the second transmit power.

Apparatuses, methods, and systems are disclosed for power control using at least one power control parameter. One method (1600) includes receiving (1602), at a first device, a set of uplink power control parameters. The method (1600) includes determining (1604) a downlink transmit power value based on the set of uplink power control parameters. The method (1600) includes transmitting (1606) a downlink reference signal to a second device, wherein a transmit power of the downlink reference signal is set to the downlink transmit power value.

Apparatuses, methods, and systems are disclosed for power control using at least one power control parameter. One method (1600) includes receiving (1602), at a first device, configuration information comprising a power offset value associated with a first plurality of resources and a first reference signal. The method (1600) includes receiving (1604) the first reference signal from a second device. The method (1600) includes performing (1606) a first measurement on the first reference signal. The method (1600) includes calculating (1608) a first expected receive power value based on the first measurement and the power offset value. The method (1600) includes calculating (1610) a first target receive power value. The method (1600) includes transmitting (1612) at least one downlink power control parameter to the second device based on the first target receive power value and the first expected receive power value.

Methods and devices are provided to enable a cooperating group of user equipments (UEs) to receive a group-specific common-parameters configuration (CPC) message over a first spectrum band and access a second spectrum band synchronously for device-to-device (D2D) sidelink transmission within the group. In an embodiment, a UE operating in a cooperation mode in a cooperating group of UEs receives a group-specific common-parameters configuration (CPC) message from a transmit point (TP) over a first spectrum band, the group-specific CPC message comprising information to configure cooperating UEs in the group for synchronous clear channel assessment (CCA) and aligned sidelink transmission starting times in a second spectrum band. The UE performs a synchronous CCA in the second spectrum band in accordance with a common contention window generated based on the information in the group-specific CPC message.

A terminal includes a control unit configured to determine, in a case where a first transmission to another terminal overlaps in at least a time domain with a second transmission to a base station, which of the transmissions is to be prioritized and a transmission unit configured to perform power control or transmission control for the first transmission and the second transmission, based on the determination, wherein the control unit changes control associated with determination of a priority order of the transmissions, based on a configuration associated with communication.

A disclosure of the present specification provides a user equipment (UE). The UE may comprise a transceiver unit for transmitting and receiving a signal, and a processor for controlling the transceiver unit, wherein the processor: obtains a network signal (NS) 33; determines an additional maximum power reduction (A-MPR) on the basis of the obtained NS 33; and determines transfer power for a sidelink signal on the basis of the determined A-MPR, and the transceiver transmits the sidelink signal to another UE with the transfer power.

A method for performing wireless communication by a first apparatus is proposed. The method may comprise the steps of: determining power related to a sidelink (SL) transmission, on the basis of a downlink pathloss, wherein the SL transmission includes at least one from among a sidelink-synchronization signal/physical sidelink broadcast channel (S-SS/PSBCH) block transmission, a physical sidelink control channel (PSCCH) transmission, a physical sidelink shared channel (PSSCH) transmission, and a physical sidelink feedback channel (PSFCH) transmission; and performing the SL transmission on the basis of the power related to the SL transmission. For example, on the basis of being configured to monitor a downlink control information (DCI) format 0_0, the downlink pathloss may be determined on the basis of a first reference signal (RS) used for control of power related to a physical uplink shared channel (PUSCH) transmission to be scheduled by the DCI format 0_0. For example, on the basis of not being configured to monitor the DCI format 0_0, the downlink pathloss may be determined on the basis of a second RS related to a synchronization signal block (SSB) for acquiring a master information block (MIB).

One disclosure of the present specification provides a user equipment (UE). The UE comprises: a transceiver for transmitting a signal and receiving a signal; and a processor for controlling the transceiver, wherein the processor: obtains network signal (NS) 52; determines an additional maximum power reduction (A-MPR) configured on the basis of obtained NS 52; and determines a transmission power for a sidelink signal, on the basis of the determined A-MPR, the transceiver transmits, to another UE, the sidelink signal with the transmission power, the sidelink signal is transmitted within a band having a center frequency of 5885 MHz and a bandwidth of 40 MHz, and the A-MPR is configured on the basis of region 1, region 2, and region 3, and may be configured on the basis of QPSK, 16 QAM, 64 QAM, and 256 QAM modulation schemes.

A method of controlling transmission power of a terminal performing device to device (D2D) communication in a wireless communication system, the method including receiving power control information corresponding to radio resources used for the D2D communication by the terminal from a base station, determining a first transmission power of the radio resources to be used for the D2D communication by the terminal among the radio resources, and transmitting data for the D2D communication with the determined first transmission power by using the radio resource to be used for the D2D communication by the terminal.

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. A method and apparatus of a wireless network are disclosed. The method includes transmitting a first request message to request allocation of a multimedia broadcast multicast service (MBMS) group identifier from a service capability server/application server (SCS/AS) to a service capability exposure function (SCEF), the first request message including an external group identifier and an SCS/AS identifier, and receiving a first response message including the MBMS group identifier from the SCEF to the SCS/AS.