A radio terminal comprising: a controller configured to control traffic steering between an Evolved-Universal Terrestrial Radio Access Network, E-UTRAN, and a Wireless Local Area Network, WLAN, wherein the controller is configured to control traffic steering from the E-UTRAN to the WLAN or from the WLAN to the E-UTRAN according to at least one of a first scheme and a second scheme, and wherein: the traffic steering means switching traffic of the radio terminal from one network to another network, in the first scheme, the controller is configured to control the traffic steering with assistance of the E-UTRAN, in the second scheme, the controller is configured to control the traffic steering in response to an instruction from the E-UTRAN, the radio terminal further comprises a receiver configured to receive, from the E-UTRAN, first assistance information to be used to determine whether the radio terminal executes the traffic steering in the first scheme, the first assistance information is broadcasted by the E-UTRAN, the receiver is configured to receive, from the E-UTRAN in a unicast manner, WLAN configuration information regarding measurement of WLAN and a timer value indicating a period over which the WLAN configuration information should be held, the controller is configured to: activate a timer corresponding to the timer value when the radio terminal transitions to RRC idle mode, hold the WLAN configuration information until the timer expires, discard the WLAN configuration information upon expiration of the timer, control the traffic steering according to the first scheme until the controller receives the instruction, and stop controlling the traffic steering according to the first scheme in response to the reception of the instruction. a controller configured to control traffic steering between an Evolved-Universal Terrestrial Radio Access Network, E-UTRAN, and a Wireless Local Area Network, WLAN, wherein the controller is configured to control traffic steering from the E-UTRAN to the WLAN or from the WLAN to the E-UTRAN according to at least one of a first scheme and a second scheme, and wherein: the traffic steering means switching traffic of the radio terminal from one network to another network, in the first scheme, the controller is configured to control the traffic steering with assistance of the E-UTRAN, in the second scheme, the controller is configured to control the traffic steering in response to an instruction from the E-UTRAN, the radio terminal further comprises a receiver configured to receive, from the E-UTRAN, first assistance information to be used to determine whether the radio terminal executes the traffic steering in the first scheme, the first assistance information is broadcasted by the E-UTRAN, the receiver is configured to receive, from the E-UTRAN in a unicast manner, WLAN configuration information regarding measurement of WLAN and a timer value indicating a period over which the WLAN configuration information should be held, the controller is configured to: activate a timer corresponding to the timer value when the radio terminal transitions to RRC idle mode, hold the WLAN configuration information until the timer expires, discard the WLAN configuration information upon expiration of the timer, control the traffic steering according to the first scheme until the controller receives the instruction, and stop controlling the traffic steering according to the first scheme in response to the reception of the instruction. activate a timer corresponding to the timer value when the radio terminal transitions to RRC idle mode, hold the WLAN configuration information until the timer expires, discard the WLAN configuration information upon expiration of the timer, control the traffic steering according to the first scheme until the controller receives the instruction, and stop controlling the traffic steering according to the first scheme in response to the reception of the instruction. <EOS>