User device and base station apparatus

Abstract

A user device for communication with a base station apparatus includes a reception unit configured to receive a plurality of synchronization blocks and a PDCCH order from the base station apparatus, a control unit configured to select a synchronization block from the plurality of synchronization blocks for use in contention free random access based on the PDCCH order, and identify a random access preamble and a random access channel resource in a manner based on the PDCCH order, and a transmission unit configured to transmit the identified random access preamble to the base station apparatus by use of the selected synchronization block and the identified random access channel resource.