A method and apparatus is provided for determining whether to transmit network slice selection assistance information to a network as part of radio connection establishment signaling. An indication from the network is received as to whether the network slice selection assistance information is required. The transmission of the network slice selection assistance information is activated when the information is determined to be required, or deactivated when the information is determined to not be required. The access stratum layer is informed by a non-access stratum layer about the network slice selection assistance information during an initiation of service request procedure when the user equipment is in a connection management idle state, and the network slice selection assistance information is transmitted in the radio connection establishment signaling to the network when the transmission of the information is activated.