5G New Radio De-Registration Procedures

A apparatus, comprising:

• a memory;
• and
• a processor in communication with the memory, wherein the processor is configured to:
• generate instructions to cause connection to a network over a first connection associated with a first access type and a second connection associated with a second access type, wherein the first access type operates according to a first protocol, and wherein the second access type operates according to a second protocol;
• generate instructions to cause initiation of, over the second connection, a first de-registration procedure for the first access type;
• generate instructions to cause initiation of a second de-registration procedure over the second connection prior to completion of the first de-registration procedure, wherein the second de-registration procedure is for the second access type;
• and
• receive, over the second connection, a de-registration accept message, wherein the de-registration accept message comprises an information element indicating de-registration of at least one of the first access type, the second access type, and the first access type and the second access type.

A non-transitory memory medium comprising program instructions that, when executed, cause a user equipment device (UE) to:

• connect to a network over a first connection associated with the first access type and a second connection associated with the second access type;
• maintain a first mobility management (MM) state machine corresponding to the first access type, a second MM state machine corresponding to the second access type, one or more counters associated with a number of non-access stratum (NAS) connections for each of the first connection and the second connection, and a first NAS connection identifier for the first connection and a second NAS connection identifier for the second connection;
• initiate, over the second connection, a de-registration procedure for at least the first access type;
• transition the first MM state machine from a current state to a de-registration initiated state;
• and
• continue use of counters associated with NAS connections associated with the second connection and the second NAS connection identifier.