a terminal identity token is created for identifying a user equipment connected to a radio base station in a radio system . the ue communicates with the radio base station via a secure communication associated with an existing cryptographic key . the terminal identity token is created based on a physical cell identity of a target cell known to both the ue and the radio base station , the terminal identity , and the existing key . by using the terminal identity token , a secure communication can be established and enhanced without having to provide for additional security network components or additional signaling .