Fairness Consideration of Scheduling for Real-Time Services in 4G Systems

Table 1

IEEE 802.16m QoS classes and priorities.

Service	Abbrev.	Priority	Definition	Typical applications
Unsolicited grant service	UGS	1	Real-time data streams comprising fixed-size data packets issued at periodic intervals	T1/E1 transport
Extended real-time polling service	ertPS	2	Real-time service flows that generate variable-sized data packets on a periodic basis	VoIP
Real-time polling service	rtPS	3	Real-time data streams comprising variable-sized data packets that are issued at periodic intervals	MPEG video
Non-real-time polling service	nrtPS	4	Delay-tolerant data streams comprising variable-sized data packets for which a minimum data rate is required	FTP with guaranteed minimum throughput
Best effort	BE	5	Data streams for which no minimum service level is required and therefore may be handled on a space-available basis	HTTP