Main States:

5GMM-NULL:5GS services are disabled in the UE. No 5GS mobility management function shall be performed in this state.

5GMM-DEREGISTERED: In the state 5GMM-DEREGISTERED, no 5GMM context has been established and the UE location is unknown to the network and hence it is unreachable by a network. In order to establish a 5GMM context, the UE shall start the initial registration procedure.

5GMM-REGISTERED-INITIATED:A UE enters the state 5GMM-REGISTERED-INITIATED after it has started the initial registration procedure or the non-initial registration procedure, and is waiting for a response from the network.

5GMM States.pdf