Topic：Practical opportunistic routing in high-

            speed multi-rate wireless mesh networks

Time：2014年08月11日（周一）上午10:00-11:30

Venue：信电大楼-215学术会议室

Speaker：Zhenghao Zhang, Associate Professor,

                Computer Science Department,

                Florida State University, USA

Biography

Zhenghao Zhang received his B.Eng. and M.S. degrees in electrical engineering from Zhejiang University, Hangzhou, China, in 1996 and 1999, respectively. He received his Ph.D. degree in electrical engineering from the State University of New York at Stony Brook in 2006. From 1999 to 2001, he worked in industry as an embedded system Software Engineer. From 2006 to 2007, he was a Postdoctoral Researcher in the Computer Science Department at Carnegie Mellon University. He joined the faculty in the Computer Science Department at Florida State University in Fall 2007 and is currently an Associate Professor. His research interests include wireless networks, network security, and high speed optical networks. He has received NSF CAREER Award, 2012,Google Research Award, 2011, and Best Paper Award, ICC 2009, for paper “Probabilistic diagnosis of link loss using end-to-end path measurements and maximum likelihood estimation”.

Abstract

Opportunistic Routing (OR) has been proven effective for wireless mesh networks. However, the existing OR protocols cannot meet all the requirements for high-speed, multi-rate wireless mesh networks, including: running on commodity Wi-Fi interface, supporting TCP, low complexity, supporting multiple link layer data rates, and exploiting partial packets. In this paper, we propose Practical Opportunistic Routing (POR), a new OR protocol that meets all above requirements. The key features of POR include: packet forwarding based on a per-packet feedback mechanism, block-based partial packet recovery, multi-hop link rate adaptation, and a novel path cost calculation which enables good path selection by considering the ability of nodes to select appropriate data rates to match the channel conditions. We implement POR within the Click modular router and our experiments in a 16-node wireless testbed confirm that POR achieves significantly better performance than the compared protocols for both UDP and TCP traffic.