USER TERMINAL, BASE STATION, COMMUNICATION SYSTEM, AND COMMUNICATION METHOD

摘要

In a small cell, in order to reduce the delay time of the start of data transmission to a user terminal, this user terminal is provided with: a measurement unit which, if the state of the connection to a small cell base station is a deactivated state, periodically measures channel state information using a channel state information reference signal transmitted from the small cell base station; and a monitoring unit which, if the aforementioned connection state is the deactivated state, periodically monitors a downlink control channel transmitted from the small cell base station. If downlink control information for the user terminal is detected in the periodic monitoring of the downlink control channel, then the connection state is switched from the deactivated state to an activated state.