An Enhanced Reliable Access Scheme for Massive IoT Applications in Ubiquitous IoT Systems

Table 1

Data classification.

Type	Priority	Characteristics	Application
HD	1 (high)	Unpredictable, low repetition rate, high real-time and reliability requirements	Fault alarm, emergency shutdown
LD	2 (medium)	Predictable, high repetition rate, high real-time and reliability requirements	Pressure control, airflow control
PD	3 (low)	Predictable, high repetition rate, low real-time and reliability requirements	Temperature monitoring, humidity monitoring