METHODS AND APPARATUSES FOR HANDLING AN UNAVAILABLE KEY

摘要

Methods and apparatuses are provided for handling an unavailable key. A method may include determining that a received message includes an indication that a handover is to be performed and an indication that a security key is to be changed on the basis of a fresh base key (700). The method may further include determining that the fresh base key is not available (710). The method may additionally include handling the received message as an exception in response to the determination that the fresh base key is not available (720). Corresponding apparatuses are also provided.