A method performed by a wireless device (110, 500, 791, 792) for determining whether the wireless device is power limited is disclosed. The method comprises receiving (1301), from a network node (160, 712), a transmit power control (TPC) command for one or more of a plurality of power control loops configured at the wireless device. The method comprises obtaining (1302) an indication of the one or more of the plurality of power control loops to which the received TPC command applies. The method comprises determining (1303), based on the obtained indication, whether one or more conditions related to power control at the wireless device are fulfilled. The method comprises determining (1304) whether the wireless device is power limited based on whether the one or more conditions are fulfilled.

In order to appropriately apply a certain DCI format and a TPC command included in the certain DCI format in future radio communication systems, an aspect of a user terminal according to the present disclosure includes a receiving section that receives downlink control information (DCI) including a transmit power control (TPC) command applied to uplink transmission on one or more component carriers, and a control section that monitors the DCI in a certain component carrier to which a monitoring operation on the DCI is indicated.

A wireless device transmits one or more preambles in response to initiating a beam failure recovery. The wireless device determines a failure of the beam failure recovery based on a number of transmissions of the one or more preambles exceeding a first number. The wireless device determines a radio link failure in response to the failure of the beam failure recovery. The wireless device starts, based on the radio link failure, a radio resource control (RRC) connection re-establishment procedure with a radio link failure report indicating the failure of the beam failure recovery is a cause of the radio link failure.

Provided is a terminal with which it is possible, in a heterogeneous cell network, to transmit a Periodic-Sounding Reference Signal (P-SRS) at a transmission bandwidth and power density necessary for carrying out both a process of selection of a transceiving participating base station and a process of frequency scheduling of a Physical Uplink Shared Channel (PUSCH). A terminal (300) comprises a receiving unit (301) which receives control information which includes information which denotes a P-SRS transmission parameter, and a transmission unit (303) which, using a transmission parameter which is included in the received control information, transmits a first P-SRS provided with a first bandwidth and a first power density at a first period, and transmits a second P-SRS provided with a second bandwidth which is narrower than the first bandwidth and second power density which is higher than the first power density at a second period.

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).

A user equipment (UE) receives, from a base station, a parameter indicating a power control loop out of a plurality of power control loops. Further, the UE receives a single downlink channel, wherein the single downlink channel carries a channel allocation and a transmit power control (TPC) command for the UE. The UE transmits a shared uplink physical channel using resources based on the channel allocation and at a transmission power level based on the transmit power command and the indicated power control loop.

Provided by the present invention are an uplink power control method and apparatus, the method comprising: a UE side acquiring a power control parameter when an uplink channel is transmitted using one TTl length among multiple TTl lengths or an uplink channel is transmitted using one timing among multiple timings; and determining a transmission power of the uplink channel according to the power control parameter, the uplink channel being a physical uplink shared channel (PUSCH) or a physical uplink control channel (PUCCH). Thus, the problem of controlling uplink power using TTIs of different lengths which is present in existing technology may be solved by means of the steps in the present invention.

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.

Systems and methods are described for reducing processing time of messages that are repeatedly received, with increasing frequency, by a device (e.g., user equipment, base station etc.). For example, the systems and methods would have a base station decrease power, possibly to minimum power-out, per policy, if messages beyond the original are received and the time between those messages is decreasing. The decrease in time between messages indicates a more urgent need for the base station to power down. The systems and methods can be adapted for different types of messages (e.g., power-up, power-down, resource request, bandwidth request, service type, call type origination, quality-of-service request, application type, etc.). Each message type is associated with a policy (pre-determined or adaptive) that indicates the default behavior when the method detects a decrease in time between messages.

Provided is a terminal with which it is possible, in a heterogeneous cell network, to transmit a Periodic-Sounding Reference Signal (P-SRS) at a transmission bandwidth and power density necessary for carrying out both a process of selection of a transceiving participating base station and a process of frequency scheduling of a Physical Uplink Shared Channel (PUSCH). A terminal (300) comprises a receiving unit (301) which receives control information which includes information which denotes a P-SRS transmission parameter, and a transmission unit (303) which, using a transmission parameter which is included in the received control information, transmits a first P-SRS provided with a first bandwidth and a first power density at a first period, and transmits a second P-SRS provided with a second bandwidth which is narrower than the first bandwidth and second power density which is higher than the first power density at a second period.