5G 4G METHODS APPARATUSES COMPUTER PROGRAMS AND CARRIERS FOR SECURITY MANAGEMENT BEFORE HANDOVER FROM 5G TO 4G SYSTEM

摘要

Key management to enable security activation before handing over the user device from the source 5G wireless communication system, i.e., the next generation system (NGS) to the target 4G wireless communication system, e. Is provided. Key management achieves reverse security, that is, prevents the target 4G wireless communication system from gaining knowledge of the 5G security information used in the source 5G wireless communication system.