A QoS Guaranteed Packet Scheduling Algorithm for OFDMA Systems
Zheng Pei-chao①; Jia Shao-jun②; Song Han-tao①
①School of Computer Science and Technology, Beijing Institute of Technology, Beijing 100081, China;②Equipment and Technologies Research of FA and ADA, General Armament Department, Beijing 100012, China
Abstract：In Orthogonal Frequency Division Multiple Access (OFDMA) systems, utilizing Proportional Fair (PF) algorithm can enhance system capacity, fairness, and performance. PF algorithm is extended, and a quality of service guaranteed packet scheduling algorithm is proposed for OFDMA systems. Users with high data rate requirements but in poor instantaneous channel state may be allocated excessive subcarriers. To prevent that situation, the algorithm uses dynamic weight factor. In a scheduling process, the weight factors of remaining subcarriers update as a subcarrier is allocated. Simulation results show that the proposed algorithm has a better performance in maintaining fairness than PF algorithm for real time services.
2008, Vol. 30 
