標題: A low-complexity beamforming-based scheduling to downlink OFDMA/SDMA systems with multimedia traffic
作者: Chung, Wen-Ching
Wang, Li-Chun
Chang, Chung-Ju
電機工程學系
Department of Electrical and Computer Engineering
關鍵字: Resource allocation;OFDMA/SDMA;Semi-orthogonal user selection;QoS;Fairness
公開日期: 1-Apr-2011
摘要: In this paper, we propose a low-complexity beamforming-based scheduling scheme utilizing a semi-orthogonal user selection (SUS) algorithm in downlink orthogonal frequency division multiple access (OFDMA)/space division multiple access (SDMA) systems to support multimedia traffic. One of the challenges in the multidimensional (space, time, and frequency) radio resource allocation problem for OFDMA/SDMA systems is its high complexity, especially to simultaneously satisfy the quality of services (QoS) requirements for various traffic classes. In the literature, the SUS algorithm is usually applied to the single-class traffic environment, but extending the SUS algorithm to the multimedia environment is not straightforward because of the need to prioritize the real-time (RT) users and the non-real-time (NRT) users. To solve this problem, we propose the concept of urgency value to guarantee the fairness of the NRT as well as the best effort (BE) users while satisfying the delay requirement for the RT users. Simulation results show that, when traffic load is greater than 0.5, the proposed scheduling algorithm can improve the fairness performance by more than 100% over the most recently proposed algorithms.
URI: http://dx.doi.org/10.1007/s11276-010-0300-0
http://hdl.handle.net/11536/9092
ISSN: 1022-0038
DOI: 10.1007/s11276-010-0300-0
期刊: WIRELESS NETWORKS
Volume: 17
Issue: 3
起始頁: 611
結束頁: 620
Appears in Collections:Articles


Files in This Item:

  1. 000288555100004.pdf