  Fifth Generation (5G) telecommunication system is going to deliver a flexible
radio access network (RAN). Security functions such as authorization,
authentication and accounting (AAA) are expected to be distributed from central
clouds to edge clouds. We propose a novel architectural security solution that
applies to 5G networks. It is called Trust Zone (TZ) that is designed as an
enhancement of the 5G AAA in the edge cloud. TZ also provides an autonomous and
decentralized security policy for different tenants under variable network
conditions. TZ also initiates an ability of disaster cognition and extends the
security functionalities to a set of flexible and highly available emergency
services in the edge cloud.
