In the ninth embodiment, the transmitter transmits the radio link failure report including, as a reason, at least any one of: an interference state of a frequency band in the WLAN communication; a failure in transmission and reception in the WLAN communication; a received strength of a radio signal from an access point performing the WLAN communication; and disconnection from the access point.
A base station according to the ninth embodiment is a cellular/WLAN collocated base station configured to support cellular communication and WLAN communication, or a base station configured to connect to an access point configured to support the WLAN communication to support the cellular communication. The base station comprises: a controller configured to control cellular/WLAN aggregation by which data belonging to an identical data bearer or different data bearers is transmitted and received by using both the cellular communication and the WLAN communication; and a receiver configured to receive, during control of the cellular/WLAN aggregation, from a user terminal configured to execute the cellular/WLAN aggregation or the access point, a radio link failure report indicating that a radio link failure in the WLAN communication occurs.
In the ninth embodiment, the controller performs, on the basis of the radio link failure report, control to transmit, to the access point or a node configured to control the access point, information for releasing a data bearer for the WLAN communication in the cellular/WLAN aggregation or information for changing a data bearer for the WLAN communication in the cellular/WLAN aggregation to another data bearer.