tailieunhanh - Báo cáo hóa học: " Research Article Cross-Layer Resource Scheduling for Video Traffic in the Downlink of OFDMA-Based Wireless 4G Networks"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Cross-Layer Resource Scheduling for Video Traffic in the Downlink of OFDMA-Based Wireless 4G Networks | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2009 Article ID212783 10 pages doi 2009 212783 Research Article Cross-Layer Resource Scheduling for Video Traffic in the Downlink of OFDMA-Based Wireless 4G Networks Feroz A. Bokhari 1 Halim Yanikomeroglu 1 William K. Wong 2 and Mahmudur Rahman1 1 Broadband Communicationsand Wireless Systems Centre Department of System and Computer Engineering Carleton University Ottawa ON Canada K1S 5B6 2 Terrestrial Wireless Systems Branch Communication Research Centre of Canada 3701 Carling Avenue . Box 11490 Station H Ottawa ON Canada K2H 8S2 Correspondence should be addressed to Mahmudur Rahman mmrahman@ Received 27 June 2008 Accepted 30 December 2008 Recommended by Zhu Han Designing scheduling algorithms at the medium access control MAC layer relies on a variety of parameters including quality of service QoS requirements resource allocation mechanisms and link qualities from the corresponding layers. In this paper we present an efficient cross-layer scheduling scheme namely Adaptive Token Bank Fair Queuing ATBFQ algorithm which is designed for packet scheduling and resource allocation in the downlink of OFDMA-based wireless 4G networks. This algorithm focuses on the mechanisms of efficiency and fairness in multiuser frequency-selective fading environments. We propose an adaptive method for ATBFQ parameter selection which integrates packet scheduling with resource mapping. The performance of the proposed scheme is compared to that of the round-robin RR and the score-based SB schedulers. It is observed from simulation results that the proposed scheme with adaptive parameter selection provides enhanced performance in terms of queuing delay packet dropping rate and cell-edge user performance while the total sector throughput remains comparable. We further analyze and compare achieved fairness of the schemes in terms of different fairness indices available in .