標題: | A Utility-Based TMCR Scheduling Scheme for Downlink Multiuser MIMO-OFDMA Systems |
作者: | Yen, Chih-Ming Chang, Chung-Ju Wang, Li-Chun 電信工程研究所 Institute of Communications Engineering |
關鍵字: | Computational complexity;multiple-input-multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM);quality-of-service (QoS) requirement;scheduling;throughput;utility function |
公開日期: | 1-十月-2010 |
摘要: | In this paper, a utility-based throughput maximization and complexity-reduction (U_TMCR) scheduling scheme is proposed for downlink multiuser multiple-input-multiple-output orthogonal frequency-division multiple-access (MIMO-OFDMA) systems. The U_TMCR scheme allocates subchannels, antenna sequence, and modulation order to multimedia users with goals not only to maximize system throughput under quality-of-service (QoS) guarantee but to reduce computational complexity as well. Based on the channel quality and the QoS requirements of each user, the U_TMCR scheme designs a utility function for every user and formulates the scheduling into an optimization problem of overall system utility function subject to system constraints. It also contains a heuristic TMCR algorithm to efficiently solve the optimization problem. Simulation results show that the U_TMCR scheme achieves system throughput very close to the optimal solution by exhaustive search and higher than conventional schemes such as adaptive radio resource allocation (ARRA) and cross-layer design of packet scheduling (CDPS) by about 8% and 21%, respectively. The U_TMCR scheme also has a QoS satisfaction ratio that is better than the ARRA and CDPS schemes. Moreover, the U_TMCR scheme can reduce computational complexity. Generally, the total number of allocation trials of the U_TMCR scheme in a frame is smaller than that of the ARRA scheme by 6.25%-29.2%. |
URI: | http://dx.doi.org/10.1109/TVT.2010.2062546 http://hdl.handle.net/11536/32104 |
ISSN: | 0018-9545 |
DOI: | 10.1109/TVT.2010.2062546 |
期刊: | IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY |
Volume: | 59 |
Issue: | 8 |
起始頁: | 4105 |
結束頁: | 4115 |
顯示於類別: | 期刊論文 |