Radio base station and radio terminal

A radio base station, comprising:

• a receiver configured to receive a message based on a measurement result of a stay time for which a radio terminal has stayed on a wireless LAN, from the radio terminal that has been connected to the wireless LAN or an entity configured to constitute the wireless LAN, wherein
• the stay time is a period from when a first process through which the radio terminal switches a waiting destination or a connection destination from a mobile communication network to the wireless LAN is performed to when a second process through which the radio terminal switches the waiting destination or the connection destination from the wireless LAN to the mobile communication network is performed.

A radio base station configured to constitute a mobile communication network, comprising:

• a controller configured to decide a parameter to be used for that a radio terminal determines whether to switch a waiting destination or a connection destination between a mobile communication network and a wireless LAN when detecting that the radio terminal switches the waiting destination or the connection destination from the mobile communication network to the wireless LAN and then switches the waiting destination or the connection destination from the wireless LAN to the mobile communication network and that a predetermined phenomenon has occurred.