Resource allocation for Adjustable QoS in OFDMA wireless networks

We propose a centralized resource allocation scheme called Proportional Fairness with Adjustable QoS (PF-AQ) for an OFDMA wireless system, which transmitting data on a frame basis. We have network resources in frequency and time domains. We develop a simple and efficient user selection, subchannel assignment, and time slot allocation based on PF utility function with a consideration of realistic queue length. Our scheme schedules a batch of packets which can extend across multiple time slots at a time, and employs multi-user diversity to maximize system throughput while keeping throughput fairness. Our scheme enhances fairness by the limitation of the maximum number of time slots assigned to each user per frame. QoS in terms of throughput and queue size can also be adjusted by adjusting this limitation.