tailieunhanh - Báo cáo hóa học: " Research Article An Analysis Framework for Mobility Metrics in Mobile Ad Hoc 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 An Analysis Framework for Mobility Metrics in Mobile Ad Hoc Networks | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 19249 16 pages doi 2007 19249 Research Article An Analysis Framework for Mobility Metrics in Mobile Ad Hoc Networks Sanlin Xu Kim L. Blackmore and Haley M. Jones Department of Engineering Faculty of Engineering and Information Technology Australian National University ACT 0200 Australia Received 31 January 2006 Revised 9 October 2006 Accepted 9 October 2006 Recommended by Hamid Sadjadpour Mobile ad hoc networks MANETs have inherently dynamic topologies. Under these difficult circumstances it is essential to have some dependable way of determining the reliability of communication paths. Mobility metrics are well suited to this purpose. Several mobility metrics have been proposed in the literature including link persistence link duration link availability link residual time and their path equivalents. However no method has been provided for their exact calculation. Instead only statistical approximations have been given. In this paper exact expressions are derived for each of the aforementioned metrics applicable to both links and paths. We further show relationships between the different metrics where they exist. Such exact expressions constitute precise mathematical relationships between network connectivity and node mobility. These expressions can therefore be employed in a number of ways to improve performance of MANETs such as in the development of efficient algorithms for routing in route caching proactive routing and clustering schemes. Copyright 2007 Sanlin Xu et al. 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 ad hoc networks MANETs are comprised of mobile nodes communicating via potentially multihop wireless links. Mobility of the nodes causes .