Wireless communication system, base station apparatus, mobile station apparatus, wireless communication method and integrated circuit

摘要

It is possible to perform effective communication based on an A-SRS transmitted from a mobile station apparatus. A base station apparatus: notifies the mobile station apparatus of control information for setting, to the mobile station apparatus, whether to transmit a first sounding reference signal assigned in a physical uplink shared channel resource or to transmit a second sounding reference signal assigned in a resource different from the physical uplink shared channel resource; and notifies the mobile station apparatus of an uplink grant including an indication of transmission of a sounding reference signal. When receiving the indication of transmission of the sounding reference signal included in the uplink grant, the mobile station apparatus transmits the first sounding reference signal to the base station apparatus when the transmission of the first sounding reference signal is set by transmission control information, and transmits the second sounding reference signal to the base station apparatus when the transmission of the second sounding reference signal is set by the transmission control information.

主权项

1. A mobile station apparatus comprising:
a reception circuitry configured to receive a physical downlink control channel which is used for scheduling of a physical uplink shared channel and which includes a sounding reference signal request field that indicates whether or not to request transmission of a sounding reference signal, wherein the reception circuitry is configured to receive a plurality of sets of parameters for the sounding reference signal by using a radio resource control signal, each of the plurality of sets including a parameter related to bandwidth for the transmission of the sounding reference signal, and the reception circuitry is configured to receive a physical downlink control channel including a 2-bit sounding reference signal request field and a physical downlink control channel including a 1-bit sounding reference signal request field, a value of each sounding reference signal request field corresponding to one of the plurality of sets; and a transmission circuitry configured to transmit the sounding reference signal with a first bandwidth, in a case that one or more information bits corresponding to a first value are set to the 2-bit sounding reference signal request field, wherein the transmission circuitry is configured to transmit the sounding reference signal with a second bandwidth, in a case that one or more information bits corresponding to a second value are set to the 2-bit sounding reference signal request field.