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Queueing-Aware Weighted-Round-Robin Subchannel Allocation for Multi-service OFDM Systems
|關鍵字:||QoS;多媒體;multimedia;wireless network;cross-layer category;optimization;fairness;resource management;OFDM;WRR;Queueing control;EF class;無線網路跨層設計;最佳化;公平性;資源分配;正交分頻多工;輪式分配;暫存器控制;加速轉發服務||出版社:||電機工程學系所||引用:|| C. Y.Wong, R. S. Cheng, and et. al., "Multiuser ofdm with adaptive subcarrier, bit, and power allocation," IEEE J. Select. Areas Commun., pp. 1747-1758, Oct. 1999.  R. F. H. Fischer and J. Huber, "A new loading algorithm for discrete multitone transmission," in Proc. IEEE Globecom''96, London, UK, Nov. 1996, pp. 724-728.  R. Sonalkar and D. Applegate, "Shannon capacity of frequency-overlapped digital subscriber loop channels," in Proc. IEEE ICC''02, May 2002, pp. 1741-1745.  E. R.Grunheid and H. Rohling, "A blockwise loading algorithm for the adaptive modulation technigue in ofdm systems," in Proc. IEEE Vehicular Technology Conference, Oct. 2001, pp. 948-951.  B. W. Jianmin Mao, W. Melody Moh, "Pqwrr scheduling algorithm in supporting of di®serv," in Proc. IEEE ICC''01, 2001, pp. 679-684.  J. H. Wen, L. C. Yeh, and J. R. Chiou, "Fast switching and fair control of congested ow in broadband networks," IEEE J. Select. Areas Commun., pp. 1315-1326, Oct. 1987.  Z. Z. Guanding Yu and et. al., "A novel resource allocation algorithm for real-time services in multiuser ofdm systems," in Proc. IEEE VTC''06, 2006, pp. 1156-1160.  K. B. L. Wei Wang, Keun Chul Hwang and S. Bahk, "Resource allocation for heterogeneous services in multiuser ofdm systems," in Proc. IEEE GLOBECOM''04, Nov. 2004, pp. 3478-3481.  D. Niyato and E. Hossain, "Queueing analysis of OFDM/TDMA systems," in Proc. IEEE GLOBECOM''05, Nov. 2005, pp. 3712-3716.  L. Kleinrock, Queueing Systems Volume 1: Theory, 2nd ed. Wiley, 1975.||摘要:||
As we move toward the next generation wireless communication systems, providing the quality of service (QoS) to multimedia transmission in the wireless network is an attracted intensive research. To meet this problem, only considering the single-layer scenario with the separate optimal solutions to each layer does not provide adequate supports for multimedia applications in crowded wireless networks. To cope with this job, devising a system model with cross-layer categories is necessary. Certain layered strategies can be implemented simultaneously in several layers and, hence, the in-depth understanding and comparative evaluation of those strategies through the negotiation between layers can lead into a well-handled system. In this dissertation, a novel resource allocation algorithm is proposed to allocate subchannels and control the queueing capacity in multi-service orthogonal frequency division multiplexing (OFDM) systems. By decomposing this algorithm into two components, namely WRR scheduler and switch-based subchannel allocator, efficient resource management is realized. Specifically, the number of subchannels to be assigned to each stream is first determined by WRR scheduler, which is founded on weighted round robin (WRR) with weight modification. Such a weight modification adapts to the service required rate and queueing variation and tackles with the unfairness inherent in conventional resource allocation mechanisms as possible. Secondly, the responsibility of the switch-based subchannel allocator is to assign subchannels with a specifically probabilistic distribution for streams. One distinguishing feature of the proposed approach is the ability of maintaining the queueing length of streams. This feature can help guarantee the delay within a bound according to Little's law and can benefit delay constraint traffic for Expedited Forwarding (EF) class services. In addition, the proposed mechanism is combined with adaptive modulation to make more efficient utilization of subchannels. The proposed mechanism is validated through simulation. The simulation results have shown the better capability of maintaining queueing length and the fairness that can be achieved by the proposed mechanism.
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