tailieunhanh - Báo cáo hóa học: "Research Article Downlink Scheduling for Multiclass Traffic in LTE"

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 Downlink Scheduling for Multiclass Traffic in LTE | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2009 Article ID510617 18 pages doi 2009 510617 Research Article Downlink Scheduling for Multiclass Traffic in LTE Bilal Sadiq 1 Ritesh Madan 2 and Ashwin Sampath2 1 Wireless Networking and Communications Group Department of Electrical and Computer Engineering The University of Texas at Austin 1 University Station C0803 Austin TX 78712-0240 USA 2 Qualcomm Flarion Technologies 500 Somerset Corporate Blvd Bridgewater NJ 08807 USA Correspondence should be addressed to Bilal Sadiq sadiq@ Received 16 February 2009 Revised 26 June 2009 Accepted 30 July 2009 Recommended by Cornelius van Rensburg We present a design of a complete and practical scheduler for the 3GPP Long Term Evolution LTE downlink by integrating recent results on resource allocation fast computational algorithms and scheduling. Our scheduler has low computational complexity. We define the computational architecture and describe the exact computations that need to be done at each time step 1 milliseconds . Our computational framework is very general and can be used to implement a wide variety of scheduling rules. For LTE we provide quantitative performance results for our scheduler for full buffer streaming video with loose delay constraints and live video with tight delay constraints . Simulations are performed by selectively abstracting the PHY layer accurately modeling the MAC layer and following established network evaluation methods. The numerical results demonstrate that queue- and channel-aware QoS schedulers can and should be used in an LTE downlink to offer QoS to a diverse mix of traffic including delay-sensitive flows. Through these results and via theoretical analysis we illustrate the various design tradeoffs that need to be made in the selection of a specific queue-and-channel-aware scheduling policy. Moreover the numerical results show that in many scenarios strict .