Methods, apparatus, and systems for handling emergency services in a wireless network are provided. A method operating a user equipment (UE) in a wireless communication system may include receiving, from an access and mobility management function (AMF), a strictly periodic registration timer indication with a periodic registration timer value; operating a periodic registration timer in a MICO (Mobile Initiated Connection Only) mode based on the received periodic registration timer value and the strictly periodic registration timer indication; initiating at least one service in the MICO mode; and determining to disable the MICO mode and not to apply the strictly periodic registration timer indication.