Performance Evaluation of Mixed Traffic Schedulers in OFDMA Networks

Low Complexity Fair Scheduling in LTE/LTE-A Uplink Involving Multiple Traffic Classes

“…Utilizing the prepared W matrix, the scheduling op-eration is performed with the help of Integer Linear Program (ILP) (2)(3)(4)(5).…”

“…The constraint (4) implies that an RC can be allocated to only a single UE. The constraint (5) signifies that one UE can get at most one RC.…”

“…Constraint (18) implies that the dummy node can have an inflow of ሺܰ − ‫ܯ‬ሻ. The other constraints are same as ILP (2)(3)(4)(5).…”

“…These different types of traffics have varying QoS requirements. For example, voice generally has stringent delay bounds (less than 50 ms) for the air interface [5]. Video, on the other hand, has to satisfy relatively relaxed delay deadlines (less than 150 ms) [5].…”

“…Further, when real-time packets with quality of service (QoS) constraints are scheduled, the scheduler has to worry about delay deadlines and packet drop constraints. In order to get around the problem of meeting delay deadlines, proposals with a two-stage scheduling are available in the literature [4] [5]. The first stage is called time-domain packet scheduling (TDPS), while the second stage of scheduling is known as the frequency domain scheduling (FDPS).…”