Impact of Traffic Modeling and Scheduling on Delay and Spectral Efficiency of the WINNER System

This paper investigates the influence of traffic models and scheduling schemes on packet delay and spectral efficiency in the context of draft QoS requirement assumptions for IMT-Advanced systems. Full buffer and constant bit rate traffic models are considered and compared. Standard proportional fair scheduler is used and augmented by an additional delay-sensitive metric. System level results utilizing grid of beams and SDMA in a downlink urban macro-cellular scenario are provided and discussed. It is found that by adapting scheduling policy to the constant bit rate traffic QoS requirements up to 25% gain over standard scheduling approach can be achieved in terms of spectral efficiency and the number of satisfied users. It is also found that by utilizing SDMA with grid of beams the number of satisfied users can be further increased by 40%.