WIRELESS BASE STATION, USER TERMINAL, WIRELESS COMMUNICATION METHOD

摘要

The present invention is designed to acquire synchronization by a radio interface taking into account on/off control of small cells. A radio base station establishes radio synchronization by using a downlink signal transmitted from a radio base station of another cell, and has a synchronization information control section that, via an inter-base station interface, reports a synchronization information request to the radio base station of the other cell and also acquires synchronization information reported from the radio base station of the other cell, and an on/off control section that, based on the synchronization information acquired, determines the status of synchronization with a cell that belongs to a lower stratum than an own cell, and executes on/off control for the own cell, and the synchronization information which the synchronization information control section acquires from the radio base station of the other cell includes information representing the synchronization status and the synchronization stratum level of the radio base station of the other cell.