A terminal apparatus comprising: a reference signal reception unit configured to receive multiple second reference signals among multiple reference signals transmitted from a base station apparatus on a first cell; a measurement unit configured to measure multiple reference signal received powers, RSRPs, each of the multiple RSRPs corresponding to each of the multiple second reference signals on the first cell; a calculating unit configured to calculate a reference value of the RSRP of the first cell by averaging N highest RSRPs of the multiple RSRPs; a transmission unit configured to send the reference value of the RSRP of the first cell to the base station apparatus; the terminal apparatus characterized by comprising: a transmission power control unit configured to identify one or more first reference signals among the multiple reference signals, the one or more first reference signals being identified by information, and to determine a transmission power of a Physical Uplink Shared Channel, PUSCH, of the first cell by using the RSRP corresponding to one of the one or more first reference signals, a Radio Resource Control, RRC, layer reception unit configured to receive, from the base station apparatus, the information through an RRC signaling, wherein the information supports at least a configuration such that some of the multiple second reference signals are identified as the one or more first reference signals. a reference signal reception unit configured to receive multiple second reference signals among multiple reference signals transmitted from a base station apparatus on a first cell; a measurement unit configured to measure multiple reference signal received powers, RSRPs, each of the multiple RSRPs corresponding to each of the multiple second reference signals on the first cell; a calculating unit configured to calculate a reference value of the RSRP of the first cell by averaging N highest RSRPs of the multiple RSRPs; a transmission unit configured to send the reference value of the RSRP of the first cell to the base station apparatus; the terminal apparatus characterized by comprising: a transmission power control unit configured to identify one or more first reference signals among the multiple reference signals, the one or more first reference signals being identified by information, and to determine a transmission power of a Physical Uplink Shared Channel, PUSCH, of the first cell by using the RSRP corresponding to one of the one or more first reference signals, a Radio Resource Control, RRC, layer reception unit configured to receive, from the base station apparatus, the information through an RRC signaling, wherein the information supports at least a configuration such that some of the multiple second reference signals are identified as the one or more first reference signals. a transmission power control unit configured to identify one or more first reference signals among the multiple reference signals, the one or more first reference signals being identified by information, and to determine a transmission power of a Physical Uplink Shared Channel, PUSCH, of the first cell by using the RSRP corresponding to one of the one or more first reference signals, a Radio Resource Control, RRC, layer reception unit configured to receive, from the base station apparatus, the information through an RRC signaling, wherein the information supports at least a configuration such that some of the multiple second reference signals are identified as the one or more first reference signals.