Service differentiation in wireless Internet using multiclass RED with drop threshold proportional scheduling

With the advent of mobile wireless Internet poised to support multi-application traffic with different sensitivities; service differentiation and service guarantee are gaining more attention. This work analyzes the steady-state queuing performance of a differentiated quality-of-service scheme over wireless links. The scheme is based on traffic classification, random early detection (RED) queue management and weighted first-come-first-served (FCFS) scheduling, in which the scheduling rate is proportional to a RED parameter, the maximum packet dropping (marking) probability. The validity of the scheme is analyzed on a three-state wireless link model, accounting for fast multipath fading, slow shadowing fading, additive noise, modulation format, and error control, under bursty traffic sources. The presented scheme offers low loss to loss-sensitive applications traffic, and low queuing delay to delay-sensitive applications traffic. Dependence of QoS metrics on wireless link state/quality is also examined.