RADIO BASE STATION APPARATUS, MOBILE TERMINAL APPARATUS AND WIRELESS COMMUNICATION METHOD

摘要

An objective of the invention is to appropriately report, in a case of application of asynchronous SRS, an SRS transmission timing and an SRS parameter to a mobile terminal apparatus, thereby efficiently using radio resources to be used for the SRS transmission. A radio base station apparatus, which reports, to a mobile terminal apparatus, SRS transmission control information to control the SRS transmission of the mobile terminal apparatus, comprises: an SRS setting unit that selects, from a table having both bit information indicating not to trigger the SRS and bit information instructing a transmission using a default SRS parameter, bit information to be reported to the mobile terminal apparatus; and a reporting unit that uses a downlink control channel to report the bit information to be reported to the mobile terminal apparatus.