tailieunhanh - Báo cáo hóa học: " Research Article Admission Control Threshold in Cellular Relay Networks with Power Adjustment"

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 Admission Control Threshold in Cellular Relay Networks with Power Adjustment | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2009 Article ID 275121 7 pages doi 2009 275121 Research Article Admission Control Threshold in Cellular Relay Networks with Power Adjustment Ki-Dong Lee and Byung K. Yi Research and Standards Department LG Electronics Mobile Research San Diego CA 92131 USA Correspondence should be addressed to Ki-Dong Lee kidonglee@ Received 2 August 2008 Revised 22 November 2008 Accepted 6 January 2009 Recommended by Yan Zhang In the cellular network with relays the mobile station can benefit from both coverage extension and capacity enhancement. However the operation complexity increases as the number of relays grows up. Furthermore in the cellular network with cooperative relays it is even more complex because of an increased dimension of signal-to-noise ratios SNRs formed in the cooperative wireless transmission links. In this paper we propose a new method for admission capacity planning in a cellular network using a cooperative relaying mechanism called decode-and-forward. We mathematically formulate the dropping ratio using the randomness of channel gain. With this we formulate an admission threshold planning problem as a simple optimization problem where we maximize the accommodation capacity in number of connections subject to two types of constraints. 1 A constraint that the sum of the transmit powers of the source node and relay node is upper-bounded where both nodes can jointly adjust the transmit power. 2 A constraint that the dropping ratio is upper-bounded by a certain threshold value. The simplicity of the problem formulation facilitates its solution in real-time. We believe that the proposed planning method can provide an attractive guideline for dimensioning a cellular relay network with cooperative relays. Copyright 2009 . Lee and B. K. Yi. This is an open access article distributed under the Creative Commons Attribution License which permits .