tailieunhanh - Báo cáo hóa học: "Research Article Spatial and Temporal Fairness in Heterogeneous HSDPA-Enabled UMTS 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 Spatial and Temporal Fairness in Heterogeneous HSDPA-Enabled UMTS Networks | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2009 Article ID 682368 12 pages doi 2009 682368 Research Article Spatial and Temporal Fairness in Heterogeneous HSDPA-Enabled UMTS Networks Andreas Mader1 and Dirk Staehle2 1Department of Distributed Systems University of Wuerzburg Sanderring 2 97070 Wurzburg Germany 2NEC Laboratories Europe Kurfuersten-Anlage 36 69115 Heidelberg Germany Correspondence should be addressed to Andreas Mader maeder@ Received 15 July 2008 Revised 27 November 2008 Accepted 29 December 2008 Recommended by Ekram Hossain The system performance of an integrated UMTS network with both High-Speed Downlink Packet Access users and Release 99 QoS users depends on many factors like user location number of users interference multipath propagation profile and radio resource sharing schemes. Additionally the user behavior is an important factor users of Internet best-effort applications tend to follow a volume-based behavior meaning they stay in the system until the requested data is completely transmitted. In conjunction with the opportunistic transmission scheme implemented in HSDPA this has implications to the spatial distribution of active users as well as to the time-average user and cell throughput. We investigate the relation between throughput volume-based user behavior and traffic dynamics with a simulation framework which allows the efficient modeling of large UMTS networks with both HSDPA and Release 99 users. The framework comprises an HSDPA MAC physical layer abstraction model and takes network aspects like radio resource sharing and other-cell interference into account. Copyright 2009 A. Mader and D. Staehle. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. Introduction Mobile network operators