Mobile M2M communication architectures, upcoming challenges, applications, and future directions

EURASIP Journal on Wireless Communications and Networking

Table 8 Existing QoS class categorization for M2M communications [118, 142, 169]

Parameters	Class 0	Class 1	Class 2	Class 3	Class 4
Use cases	e-healthcare,	Mobile POS	Intelligent	Smart homes,	Metering,
	emergency	(point of sale)	transportation,	security	monitoring
	alerting		streaming,
Traffic types	Random,	Random,	Random	Random	Regular
	real time	real time
Priority	Strict, high	Low-1	Low-2	Low-3	Low-3
Data size in bytes	Small	Small	Small	Small/medium	Large
Inter-send time	Seconds	Seconds	Minute	Minute	Seconds
				↓	↓
				hours	hours
Mobility	Low	Low	Low	No	Low
			↓
			high
Delay budget	Milliseconds	Milliseconds	Milliseconds	Minute	Seconds
			↓		↓
	[approx. 125 ms]		minute		hours