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 Efficient Control Channel Resource Allocation for VoIP in OFDMA-Based Packet Radio Networks | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2011 Article ID 712658 11 pages doi 2011 712658 Research Article Efficient Control Channel Resource Allocation for VoIP in OFDMA-Based Packet Radio Networks Yong Fan and Mikko Valkama Department of Communications Engineering Tampere University of Technology Tampere 33720 Finland Correspondence should be addressed to Yong Fan Received 15 November 2010 Accepted 28 February 2011 Academic Editor Boris Bellalta Copyright 2011 Y. Fan and M. Valkama. 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. We propose an efficient control channel resource allocation approach to enhance the performance of voice-over-IP VoIP in orthogonal frequency division multiple access- OFDMA- based next generation mobile communication systems. As the long-term evolution LTE of universal terrestrial radio access network UTRAN evolved UTRAN E-UTRAN is the first OFDMA-based packet radio network and thus selected in this paper as an application example. Our proposed physical downlink control channel PDCCH resource allocation approach for E-UTRAN is composed of bidirectional power control inner loop link adaptation ILLA and outer loop link adaptation OLLA algorithms. Its effectiveness is validated through large-scale radio system level simulations and simulation results confirm that VoIP capacity with dynamic scheduling can be further enhanced with this PDCCH resource allocation approach. Moreover the VoIP performance requirements for international mobile telecommunications-advanced IMT-Advanced radio interface technologies can be met with dynamic scheduling together with proposed PDCCH resource allocation. Besides E-UTRAN this approach can be introduced to other OFDMA-based mobile communication systems for VoIP .
