A Novel Cross-Layer Design with QoS Guarantee for WiMAX System

WiMAX standard defines the QoS (Quality of Service) signaling framework and different types of service flows, but the actual QoS guarantee algorithms are open to developers. Admission control in medium access control (MAC) layer without physical (PHY) layer information has a low efficiency. In this paper, to provide the QoS guarantee, we propose a novel cross-layer QoS design which consisting of admission control and subchannel assignment, taking physical layer channel information into account. The occupation of physical resource is an important feedback for the admission controller and we provide simulation results to demonstrate that our algorithms can bring higher spectral efficiency of the system than the no cross-layer method.