Provided is a communication unit for implementing functions for URLLC that requires communication of high reliability and/or low latency in the 5GS. Provided is a communication unit for enabling functions for URLLC even in the 5GS that supports a network-initiated configuration update procedure and multiple types of session and service continuity. Further, provided is a communication unit for, in a case that multiple types of functions for URLLC are possible, sharing which function out of the functions for URLLC is available and appropriately managing shared information between a user equipment and a network.