Superordinate base station, subordinate base station, and radio communication system

摘要

A superordinate base station, a subordinate base station with control functionality that is more limited than the control functionality of the superordinate base station, a user device that can communicate by radio with the superordinate base station and with the subordinate base station, a switching center, and a gateway device are provided. The superordinate base station has interfaces for control-plane communication and a transceiving unit that performs transceiving with the subordinate base station through an X3 interface. The subordinate base station has an interface for user-plane communication and an X3 interface for communication with the superordinate base station. Operations of the subordinate base station are controlled by control messages transmitted from the superordinate base station.