RADIO BASE STATION, RADIO TERMINAL DEVICE, RADIO RELAY STATION DEVICE, TRANSMISSION POWER CONTROL METHOD, RADIO COMMUNICATION RELAY METHOD, AND RADIO COMMUNICATION SYSTEM

摘要

Resources allocated for communication with a base station are different between a terminal and a relay station. A radio base station device (1) arranged in the base station includes: a judgment unit (7) which judges whether relay of a random access preamble is present according to the resource information contained in the random access preamble; and a response generation unit (10) which generates a random access response to which the relay flag information is attached. When the random access response having the relay flag information is transmitted from the base station to the terminal, the terminal controls a transmission power of an RRC connection request according to the relay flag information. This can provide a radio base station device which can suppress increase of a delay until the RRC connection probability and improve the resource use efficiency.