A Cross Layer Scheduling and Resource Allocation Algorithm for OFDMA Wireless Networks

• Main Authors: Iao-Tin Lin, 林瑤亭
• Other Authors: 陳永芳
• Format: Others
• Language: en_US
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/47562453566135861468

碩士 === 國立中央大學 === 通訊工程研究所 === 95 === As multimedia communications develop rapidly in the recent years, in order to maximize the capacity of wireless networks, scheduling plays an important role in supplying quality of service (QoS) requirements to broadband wireless communications. The IEEE 802.16 standard provides four different scheduling services: Unsolicited Grant Service (UGS), real-time Polling Service (rtPS), non-real-time Polling Service (nrtPS), and Best Effort (BE). In this paper, we formulate the optimal problem by maximizing the average utility function of all active users and then propose a cross-layer algorithm to achieve the higher throughput by allocating resources dynamically. Our scheme is aimed at designing jointly dynamical subchannel assignment (DSA)and capacity planning (CP) solutions. The simulation focuses on IEEE 802.16 wireless systems working in Orthogonal Frequency Division Multiple Accesses (OFDMA) and Point-to-Multipoint (PMP) mode, with one single cell serving many Mobile Stations (MSs) in downlink transmission. Finally, the numerical result shows that the cross-layer algorithm approaches a higher throughput and improves extremely the performance of BE and nrtPS services while supporting the quality of rtPS services at acceptable levels.