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 On Coverage and Capacity for Disaster Area Wireless Networks Using Mobile Relays | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2009 Article ID251314 17 pages doi 2009 251314 Research Article On Coverage and Capacity for Disaster Area Wireless Networks Using Mobile Relays Wenxuan Guo and Xinming Huang Department of Electrical and Computer Engineering Worcester Polytechnic Institute 100 Institute Road Worcester MA 01609 USA Correspondence should be addressed to Wenxuan Guo wxguo@ Received 11 June 2009 Accepted 8 September 2009 Recommended by George Karagiannidis Public safety organizations increasingly rely on wireless technology to provide effective communications during emergency and disaster response operations. This paper presents a comprehensive study on dynamic placement of relay nodes RNs in a disaster area wireless network. It is based on our prior work of mobility model that characterizes the spatial movement of the first responders as mobile nodes MNs during their operations. We first investigate the COverage-oriented Relay Placement CORP problem that is to maximize the total number of MNs connected with the relays. Considering the network throughput we then study the CApacity-oriented Relay Placement CARP problem that is to maximize the aggregated data rate of all MNs. For both coverage and capacity studies we provide each the optimal and the greedy algorithms with computational complexity analysis. Furthermore simulation results are presented to compare the performance between the greedy and the optimal solutions for the CORP and CARP problems respectively. It is shown that the greedy algorithms can achieve near optimal performance but at significantly lower computational complexity. Copyright 2009 W. Guo and X. Huang. 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 Public safety organizations .
