tailieunhanh - Báo cáo hóa học: " Research Article Busy Bursts for Trading off Throughput and Fairness in Cellular OFDMA-TDD"

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 Busy Bursts for Trading off Throughput and Fairness in Cellular OFDMA-TDD | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2009 Article ID 462396 14 pages doi 2009 462396 Research Article Busy Bursts for Trading off Throughput and Fairness in Cellular OFDMA-TDD Birendra Ghimire 1 Gunther Auer 2 and Harald Haas1 3 1 Institute for Digital Communications Joint Research Institute for Signal and Image Processing The University of Edinburgh EH9 3JL UK 2DOCOMO Euro-Labs Landsberger Strafe 312 80687 Munich Germany 3School of Engineering and Science Jacobs University Bremen 28759 Bremen Germany Correspondence should be addressed to Harald Haas Received 1 July 2008 Accepted 8 December 2008 Recommended by Mohamed Hossam Ahmed Decentralised interference management for orthogonal frequency division multiple access OFDMA operating in time division duplex TDD cellular systems is addressed. Interference aware allocation of time-frequency slots is accomplished by letting receivers transmit a busy burst BB in a time-multiplexed minislot upon successful reception of data. Exploiting TDD channel reciprocity an exclusion region around a victim receiver is established whose size is determined by a threshold parameter known at the entire network. By adjusting this threshold parameter the amount of cochannel interference CCI caused to active receivers in neighbouring cells is dynamically controlled. It is demonstrated that by tuning the interference threshold parameter system throughput can be traded off for improving user throughput at the cell boundary which in turn enhances fairness. Moreover a variable BB power is proposed that allows an individual link to signal the maximum CCI it can tolerate whilst satisfying a certain quality-of-service constraint. The variable BB power variant not only alleviates the need to optimise the interference threshold parameter but also achieves a favourable tradeoff between system throughput and fairness. Finally link adaptation conveyed by BB signalling .