Faculty of Engineering and Natural Sciences
Exploiting Asymmetric Links in Wireless Networks
Damla Turgut, Ph.D.
University of Central Florida
School of EECS
Asymmetric links are common in wireless networks for a variety of physical, logical, operational, and legal considerations. An asymmetric link supports unidirectional communication between a pair of mobile stations and requires a set of relay stations for the transmission of packets in the other direction.
In this presentation, we discuss how to improve the performance of wireless networks by exploiting asymmetric links. We argue that this implies changes to both of the MAC and the network layer. We propose A4LP routing protocol which uses m-limited forwarding as a technique to reduce the cost of disseminating information in a power-constrained environment by limiting the cardinality of the subset of nodes which retransmit a packet. We introduce the AMAC MAC layer protocol for wireless networks with asymmetric links. We show that this protocol requires fewer nodes to maintain silence during a transmission exchange than the previously protocols proposed asymmetric MAC protocols. We present a set of concepts and metrics characterizing the ability of a medium access control protocol to silence nodes which can cause collisions. Our simulation study shows that A4LP / AMAC has a lower average packet loss ratio than OLSR / IEEE 802.11 in heterogeneous wireless networks.
Damla Turgut is an assistant professor at the School of Electrical Engineering and Computer Science of University of Central Florida. She received her BS, MS, and PhD degrees from the Computer Science and Engineering Department of University of Texas at Arlington in 1994, 1996, and 2002 respectfully. Her research interests include wireless networking, mobile computing, distributed systems, agents, and databases. She is a member of IEEE, member of the ACM, and the Upsilon Pi Epsilon honorary society. For more information, visit her homepage http://www.eecs.ucf.edu/~turgut.
May 2, 2006, 14:40, FENS L063