M.Akar; "Dynamic Resource Management for Wireless Networks.."
Dynamic Resource Management for Wireless Networks Using Hybrid Systems
Dr. Mehmet Akar
Abstract:
Dynamic resource allocation in wireless networks is important for efficient utilization of the spectrum and maintaining reliable communication links between transmitters and receivers. In order to achieve these objectives, the transmitted powers/rates, base station assignments, and allocated channels may need to be updated as the users move around or when new calls are admitted to the network.
In the first part of the talk, we will address integrated power control and handoff design for cellular networks using hybrid systems and dynamic programming, and propose new joint hard/soft handoff and power control algorithms that are suitable for implementation in the next generation wireless networks. The proposed algorithms present a paradigm shift in integrated handoff/power control by capturing the tradeoff between user satisfaction and network overhead, therefore enjoy the advantages of joint resource allocation, and provide significant improvement over existing methods. The second part of the talk will focus on dynamic properties of distributed power control for time-varying channels. Through simulations we demonstrate that a well known distributed control algorithm by Foschini and Miljanic may fail to converge in the presence of shadowing, handoffs, and rate variations. In order to better explain this observation, and provide a systematic framework to study the stability of distributed power control algorithms in general, we present the problem in the context of switched systems which can capture the time-variations of the channel and handoff. This formulation leads to interesting stability problems, which we address using common quadratic Lyapunov functions and M-matrices.
Biography:
Mehmet Akar received his BS (1994) and MS (1996) degrees from Bilkent
University, Ankara, Turkey, and his PhD degree (1999) from the Ohio
State University, all in electrical engineering. From January 2000 till
July 2001, he was a postdoctoral research associate at Yale University.
In the summer of 2001, he drove to the west coast to join the
University of Southern California where he first held a research
associate position till February 2003, and later served as a research
assistant professor.
His current research interests include wireless resource allocation,
distributed decision making in communication networks, and stability
and control of hybrid systems.
January 4th, 2005, 14:40, G035