Year: 2005
Type: conference-paper
Abstract: We consider optimal rate control for delay constrained data transmission, over time varying channels, with the objective of minimizing the transmission energy expenditure. Energy efficiency is achieved by spreading the data transmission over time to exploit the convexity of the power-rate functions and further, by opportunistically adapting the transmission rate to the channel variations. Our system model consists of a buffer with B units of data that must be transmitted by a finite deadline T with minimum energy over a time-varying channel. Using a continuous-time stochastic control formulation, we obtain simple closed form expressions for the optimal transmission rate that minimizes the energy expenditure and meets the deadline constraint. Finally, simulation results compare the gains achieved by the optimal rate adaptation with non-adaptive policies.
Authors: Murtaza Zafer, Eytan Modiano
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7095695485