Adaptive TUF Packet Scheduling Scheme for OFDMA-Based WiMAX Systems

WiMAX is a well-known broadband wireless access technology to support for different users in multimedia transmission. Its physical layer can be employed with Orthogonal Frequency-Division Multiple Access (OFDMA) technology. IEEE 802.16e has evolved five scheduling types of Quality of Service (QoS) for uplink transmission, but has not yet clearly defined the scheduling types for downlink transmission and described how to schedule the packets efficiently in BS taking into account their QoS. Many packet scheduling algorithms for WiMAX and OFDMA-based networks have been widely studied. This paper proposed an Adaptive Time-Utility Function (A-TUF) packet scheduling scheme to improve the QoS of RT traffic and the whole system throughput.