Network service device, linking management device and operation methods thereof

A network service device includes a storage module, a communication module and a processing module. The storage module stores a ultra-reliable low-latency communication (URLLC)-compliant message. The processing module is coupled to the storage module and the communication module. The processing module receives a connection establish request message from a session management device through the communication module, and establishes a session according to the connection establish request message. The processing module provides the URLLC-compliant message to the session management device through the communication module.