Systems and methods relating to transmit power control are disclosed. In some embodiments, a method of operation of a radio access node for providing transmit power control commands to a wireless device for uplink (UL) transmission on a cell that operates in an unlicensed frequency spectrum is provided. The method comprises indicating, for the cell that operates in the unlicensed frequency spectrum, a dynamic Transmit Power Control (TPC) command using a downlink (DL) control channel which indicates a DL-UL allocation of upcoming subframes in the cell that operates in the unlicensed frequency spectrum. In some embodiments, the DL control channel is a common DL control channel. In some other embodiments, the DL channel is a common Physical Downlink Control Channel (PDCCH).

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a plurality of transmit power control commands identifying a plurality of transmit power values, wherein the plurality of transmit power control commands relate to a set of out-of-order communications. The UE may determine a transmit power for a communication based at least in part on the plurality of transmit power control commands. The UE may transmit the communication based at least in part on the determining the transmit power. Numerous other aspects are provided.

A wireless device receives a medium access control (MAC) control element (CE) identified by a MAC subheader. The MAC CE comprises: a first field associated with a first cell of a plurality of cells, wherein the first field being set to a first value indicates a command of activation/deactivation of SP CSI reporting on the first cell is present; a semi-persistent channel state information (SP CSI) reporting activation/deactivation indicator; and a SP CSI report trigger field indicating a SP CSI reporting of a plurality of SP CSI reporting on the first cell; In response to the SP CSI reporting activation/deactivation indicator indicating an activation of the SP CSI reporting on the first cell, a SP CSI report for the first cell is transmitted via an uplink control channel.

Systems and methods are disclosed that provide a closed loop power control system including adaptively adjusting the desired target SINR over time so as to ultimately achieve a feasible SINR. In one implementation, a method is provided of optimizing uplink closed loop power control in a RAN in which one or more base stations each service a plurality of mobile stations, including: determining a power level for each mobile station for its respective uplink transmissions, including measuring a current achieved SINR for each mobile station; and for each mobile station, adjusting the power level to be sufficiently high to meet desired transmission characteristics but not so high as to cause unnecessary interference with transmissions from other mobile stations, by adjusting a desired target SINR based on factors selected from the following: current and prior achieved SINRs, current and prior interference measurements, and current and prior transmission power control commands.

Selectively controlling transmit power from a radio access network (RAN) cell to user equipment (UE) in closed-loop power control for uplink control channel based on variation in measured uplink signal quality. To avoid the RAN cell continuously sending transmit power control messages that may not be effective in further adjusting transmit power of the UE, the RAN cell selectively controls transmit power of the UE based on effectiveness in such transmit power control changing uplink channel signal quality. The determined effectiveness of the transmit power control can be used by the RAN cell to determine when the next transmit power control message should be sent to the UE. The RAN cell can be configured to indirectly measure the uplink channel power by reviewing the received uplink channel quality in a report communicated from the UE to the RAN cell.

A communication system is provided. The communication system includes at least one radio point, each configured to exchange radio frequency (RF) signals with a user equipment (UE) at a site. The communication system also includes a controller communicatively coupled to the at least one radio point. The controller is configured to determine a transmit power control (TPC) command for the UE based on a signal to interference plus noise (SINK) for the UE. The controller is also configured to determine a count (N) of consecutive uplink transmissions, from the UE, meeting at least one criteria. The controller is also configured to determine a modified TPC command for the UE based on the count (N) and the TPC command.

A terminal apparatus communicates with a base station apparatus by using a plurality of cells including at least a primary cell and a secondary cell. The terminal apparatus decodes a PDCCH with downlink control information format in which at least a transmission power control command field is included, transmits a PUCCH on the primary cell, and determines transmission power of the PUCCH on the primary cell based on at least a PUCCH power control adjustment parameter. The PUCCH power control adjustment parameter is calculated by accumulating at least a value indicated by the transmission power control command field, and in a case where the terminal apparatus receives a random access response message for the primary cell, the transmission power control circuitry is configured to and/or programmed to reset the PUCCH power control adjustment parameter.

Embodiments of this application provide a wireless communications method and device, to perform appropriate power control on an SRS. The method includes: obtaining a closed-loop power control parameter for a sounding reference signal SRS resource set according to a first uplink signal or a first downlink signal corresponding to the SRS resource set; determining a target transmit power for the SRS resource set according to the closed-loop power control parameter; and sending an SRS to a network device on an SRS resource in the SRS resource set according to the target transmit power.

Disclosed is a method for determining transmit power in a wireless communication system according to one embodiment of the present invention. The method, which is performed by a terminal, comprises the steps of: receiving a semi-persistent scheduling (SPS) setting of a short transmission time interval (sTTI); receiving control information for SPS-related transmit power control according to the received setting; and determining an SPS-related transmit power by using a transmit power control (TPC) command included in the received control information, wherein the control information may include a TPC command for each of a plurality of TTI lengths, which includes an SPS-related TPC command of the sTTI.

A wireless device starts a beam failure recovery (BFR) timer in response to initiating a contention-free random access procedure for a BFR. Based on expiry of the BFR timer, a first preamble employing a contention-based random access for the BFR is transmitted. In response to not receiving a response for the first preamble, a preamble transmission counter is incremented from a value of the preamble transmission counter of the contention-free random access procedure before the expiry of the BFR timer. A second preamble is transmitted in response to a value of the preamble transmission counter being equal to or less than a number.