Solution to skip authentication procedure during Circuit- Switched Fallback (CSFB) to shorten call setup time

摘要

A User Equipment (UE) device or network system facilitates a Circuit Switched Fallback (CSFB) procedure to enable fallback from a Long Term Evolution (LTE) network to a circuit switched domain network. A network device or a UE can operate to skill skip an authentication procedure during CSFB procedures and shorten a call setup time. A key access security management entity (K