A method performed by a wireless device in a wireless communication system, the method comprising: receiving a radio resource control, RRC, release message comprising dedicated reselection information for a cell reselection and information for a timer related to the dedicated reselection information, wherein the dedicated reselection information comprises at least one of: a list of frequencies, or a corresponding dedicated priority for each frequency in the list, or slice-related information comprising a network slice identifier, ID, for at least one frequency in the list; starting the timer upon receiving the information for the timer; performing the cell reselection to a cell on a frequency supporting a network slice preferred by the wireless device while the timer is running, wherein the frequency supporting the network slice preferred by the wireless device is identified based on the slice-related information in the dedicated reselection information; and upon an expiry of the timer: performing an RRC connection establishment with a network; and transmitting, to the network, slice information preferred by the wireless device, wherein the slice information comprises frequency information informing at least one frequency supporting one or more network slices preferred by the wireless device, and wherein the slice information is transmitted to the network after a completion of the RRC connection establishment with the network. receiving a radio resource control, RRC, release message comprising dedicated reselection information for a cell reselection and information for a timer related to the dedicated reselection information, wherein the dedicated reselection information comprises at least one of: a list of frequencies, or a corresponding dedicated priority for each frequency in the list, or slice-related information comprising a network slice identifier, ID, for at least one frequency in the list; starting the timer upon receiving the information for the timer; performing the cell reselection to a cell on a frequency supporting a network slice preferred by the wireless device while the timer is running, wherein the frequency supporting the network slice preferred by the wireless device is identified based on the slice-related information in the dedicated reselection information; and upon an expiry of the timer: performing an RRC connection establishment with a network; and transmitting, to the network, slice information preferred by the wireless device, wherein the slice information comprises frequency information informing at least one frequency supporting one or more network slices preferred by the wireless device, and wherein the slice information is transmitted to the network after a completion of the RRC connection establishment with the network. a list of frequencies, or a corresponding dedicated priority for each frequency in the list, or slice-related information comprising a network slice identifier, ID, for at least one frequency in the list; starting the timer upon receiving the information for the timer; performing the cell reselection to a cell on a frequency supporting a network slice preferred by the wireless device while the timer is running, wherein the frequency supporting the network slice preferred by the wireless device is identified based on the slice-related information in the dedicated reselection information; and upon an expiry of the timer: performing an RRC connection establishment with a network; and transmitting, to the network, slice information preferred by the wireless device, wherein the slice information comprises frequency information informing at least one frequency supporting one or more network slices preferred by the wireless device, and wherein the slice information is transmitted to the network after a completion of the RRC connection establishment with the network. performing an RRC connection establishment with a network; and transmitting, to the network, slice information preferred by the wireless device, wherein the slice information comprises frequency information informing at least one frequency supporting one or more network slices preferred by the wireless device, and wherein the slice information is transmitted to the network after a completion of the RRC connection establishment with the network.