WLCp2-02: Differentiated Multiclass QoS in Wireless Multicarrier Environments
Differentiated QoS provision in wireless environments via multicarrier energy allocation is examined in this work. Within this framework, differentiated QoS is applied to transmitted data classes, such as text, audio and video, simultaneously. QoS targets, or constraints, are defined by specifying distortion targets for each class, and energy is allocated to carriers of different classes to meet those targets/constraints accordingly. QoS differentiation is achieved by a concept called QoS scaling. We develop a methodology to find the set of scalars that allows each service constraint to be met. While earlier work can be viewed to offer solutions to the scalar-to-distortion mapping problem, this research solves the more challenging inverse mapping problem; namely, from distortion requirements to selection of scalars. We present two algorithms for differentiated QoS that depend upon the amount of constrained classes relative to the total amount of classes. Finally, to provide a clearer understanding of the effect of QoS scaling, we analyze the effect on distortion by varying the total number of scalars.