Cataloged from PDF version of article.Thesis (M.S.): Bilkent University, Department of Electrical and Electronics Engineering, İhsan Doğramacı Bilkent University, 2018.Includes bibliographical references (leaves 46-50).Energy-efficiency of wireless communication systems has been an important research
topic in recent years. For such a system, a transmission profile is described
by the transmission power and the modulation and coding scheme (MCS) to be
used for packet transmission. For a given channel condition, higher order MCSs
offer higher throughput at the expense of requiring more transmission power.
Average power consumption of the system can be reduced by using lower order
MCSs at the expense of increased queuing delays. Using this observation, the
goal of this study is the development of transmission profile selection policies so
as to minimize the average power consumption while meeting a statistical delay
constraint for a wireless link. For the purpose of assessing the proposed policies,
the system is modeled as an M/M/1 queue where transmission speeds of packets
are dynamically selected based on the queuing delay already experienced by
them. This setting is shown to give rise to a multi-regime Markov
uid queue
model which is used to obtain the waiting time distributions of packets as well
as the average power consumption. In the numerical examples, proposed pro-
file selection policies are evaluated for different system parameters using realistic
transmission profiles obtained from LTE simulations. A proposed energy-aware
profile selection policy is shown to consistently outperform all other proposed
policies in terms of energy-efficiency whereas a reasonable performance is also
obtained with a simpler-to-implement policy.by Ege Orkun Gamgam.M.S
