Application-specific and QoS-aware scheduling for wireless systems

This paper describes how user-specific QoS requirements are a critical innovation that may be used to improve spectral utilization in wireless systems. Rate adaptation and MAC scheduling algorithms that process user-specific QoS to improve system capacity are proposed and evaluated. Through dynamically adapting the AMR codec mode or video data rate and the MAC scheduling algorithm to the user-specific QoS requirements, system capacity, as measured by the number of supportable users, is maximized, while user satisfaction, as measured by the Mean Opinion Score (MOS), is maintained at an acceptable level. OPNET system simulations were performed for a set of VoIP users and video users that were assigned specific QoS target levels. Simulation results show that significant system capacity improvement and acceptable MOS level can be achieved if such user-specific QoS requirements are considered in the rate adaptation and MAC scheduling algorithms.