User equipment, base station and method for paging procedure

A user equipment, comprising:

• a receiver, which in operation, receives, from a base station controlling a radio cell of a mobile communication system in which the user equipment is located, information on a plurality of network slices, the information at least including for each network slice of the plurality of network slices a shortened network slice ID identifying the respective network slice and including mapping information defining a mapping between the shortened network slice ID and a full network slice ID that unambiguously identifies the network slice within the mobile communication system;
• a processor, which in operation, determines at least one out of the plurality of network slices and a corresponding full network slice ID, wherein the processor, when in operation, further determines a corresponding at least one shortened network slice ID based on the received mapping information, wherein the at least one shortened network slice ID is four least significant bits of the full network slice ID;
• and
• a transmitter, which in operation, transmits a data transmission preparation message to the base station that comprises the determined at least one shortened network slice ID.