"Asynchronous Unicast and Multicast Rendezvous Protocols for Heterogeneous Dynamic Spectrum Access (DSA) Networks"

Mohammad Abdel Rahman

University of Arizona


Asynchronous Unicast and Multicast Rendezvous Protocols for Heterogeneous Dynamic Spectrum Access (DSA) Networks Link establishment in dynamic spectrum access (DSA) networks requires communicating nodes to “rendezvous” before transmitting their data packets. Frequency hopping (FH) provides an effective method for rendezvousing without relying on a common control channel. Previous FH rendezvous protocols have one or more of the following limitations. First, they use fixed FH sequences, which do not adapt to variations in channel availability. Second, they assume a homogeneous spectrum environment, i.e., all nodes perceive the same spectrum opportunities. Third, they do not support multicast rendezvous while simultaneously maintaining multicast consistency. In this talk, I will present a novel quorum-based FH algorithm for asynchronous pairwise rendezvous in heterogeneous DSA networks. The FH sequences obtained using this algorithm can achieve fast pairwise rendezvous, support adaptive frame lengths, and are robust against node compromise. Furthermore, I will briefly present three multicast rendezvous algorithms that are intended for asynchronous spectrum-heterogeneous DSA networks. They provide different tradeoffs between speed and robustness to node compromise. Moreover, optimal channel ordering mechanisms for channel sensing and assignment will be discussed. Finally, I will introduce a proactive out-of-band sensing based dynamic FH (DFH) algorithm for online adaptation of FH sequences. Bio Mohammad J. Abdel Rahman was born in 1987. He received the M.S. degree in electrical engineering from Jordan University of Science and Technology, Jordan, in 2010 and the B.S. degree in communication engineering from Yarmouk University, Jordan, in 2008. He is currently working toward the Ph.D. degree in electrical and computer engineering at the University of Arizona, where he is a research assistant in the wireless and advanced networking lab. His current research interests are in wireless communications and wireless networks with emphasis on wireless cognitive radio networks. In summer 2009, he joined the summer academy “wireless communications, new technologies and research challenges” held in Ilmenau University of Technology, Ilmenau, Germany. He published papers in the IEEE International Conference on Wireless Communications and Mobile Computing (IWCMC) and the IEEE International Conference on Communications (ICC). He served and continues to serve as a reviewer for several international conferences and journals, including IEEE ICC, IEEE Transactions on Mobile Computing (TMC) and IEEE Journal on Selected Areas on Communications (JSAC).

[Mohammad Abdel Rahman]
University of Arizona