METHOD AND USER EQUIPMENT FOR MANAGING FAILURE IN REGISTRATION FOR ACCESSING NETWORK SLICE

A method performed by a User Equipment (UE) for managing a failure in a registration for accessing a network slice is provided. The method includes sending a registration request message to a first wireless network while the UE is in a tracking area of a registration area, the registration request message including a Single Network Slice Selection Assistance Information (S-NSSAI) corresponding to the network slice, receiving a registration reject message from the first wireless network, the registration reject message indicating that the network slice is unavailable in one of the registration area, a Public Land Mobile Network (PLMN), or a Stand-alone Non-Public Network (SNPN), storing a Tracking Area Identifier (TAI) of the tracking area to a rejected list based on the TAI of the tracking area being included the registration reject message, and establishing a connection with a second wireless network in response to the receiving.