Downlink resource management for packet transmission in OFDM wireless communication systems

In this paper, downlink resource management scheme is proposed for heterogeneous packet transmission in orthogonal frequency-division multiplexing (OFDM) wireless communication systems. By making use of the properties in the physical layer of the OFDM system, the resource management scheme is developed by integrating power allocation, subcarrier allocation, and generalized processor sharing (GPS) scheduling. With the scheme, maximum system throughput can be achieved, while guaranteeing the required signal-to-noise ratio (SNR) for heterogeneous traffic, providing fairness to all the traffic in the system, and satisfying the total transmission power constraint. For practical implementation, a truncated GPS (TGPS) scheduling and a simplified power and subcarrier allocation algorithm are introduced. Simulation results are given to demonstrate the performance of the proposed resource management scheme.