User Specific QoS and Its Application in Resources Scheduling for Wireless System

This paper describes user specific QoS requirements that are a critical innovation for improving spectral utilization for wireless systems. An adaptive scheduler is presented that incorporates user specific QoS requirements in the spectral allocation of resources. In this paper, we focus on voice applications, and demonstrate that by dynamically adapting MAC scheduling algorithms to the user specific QoS requirements, user satisfaction, as measured by the user specific Mean Opinion Score (MOS), is maximized. OPNET LTE system simulations have been performed for a set of AMR VoIP users with assigned specific QoS target levels. Simulation results show that significant MOS improvements can be achieved if such user specific QoS requirements are considered in the MAC scheduler. Furthermore, when targeted to maximize spectrum utilization and combined with AMR codecs matched to the auditory characteristics of users, higher system capacity, at comparable MOS levels, may be achieved.