Structural results in cross layer optimization of wireless networks

Wednesday, June 29, 2005 - 11:00am - 12:00pm
EE/CS 3-180
Vikram Krishnamurthy (University of British Columbia)
In the first part of the talk, we consider the interaction between the physical and link layers for single user systems. By using a Lagriangian approach to constrained Markov decision processes and stochastic dominance results, we examine the structural effects of buffer size, fading channel dynamics and traffic dynamics on system throughput. Also a channel aware ARQ protocol is proposed that uses a partially observed Markov deicision process to optimize the tradeoff between latency and throughput.

In the second part of the talk, we consider cross layer admission control and vertical handoff between WLAN and CDMA networks for multiuser systems. We present gradient learning based stochastic approximation algorithms to optimize the resulting constrained Markov decision process.