Continuous-time Optimal Rate Control for Delay Constrained Data Transmission
نویسندگان
چکیده
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. Index Terms Energy efficiency, Delay constraints, Wireless fading channel, Rate control, Quality of Service.
منابع مشابه
The Exact Solution of Min-Time Optimal Control Problem in Constrained LTI Systems: A State Transition Matrix Approach
In this paper, the min-time optimal control problem is mainly investigated in the linear time invariant (LTI) continuous-time control system with a constrained input. A high order dynamical LTI system is firstly considered for this purpose. Then the Pontryagin principle and some necessary optimality conditions have been simultaneously used to solve the optimal control problem. These optimality ...
متن کاملAdaptive QoS control for real-time video communication over wireless channels
Robust transmission of real-time video over wireless channels is a challenging problem. This is because the bit error rate (BER) in wireless channels is very high and the bit errors could have devastating effects on the video presentation quality. This paper addresses this problem by introducing adaptive quality-of-service (QoS) control for real-time video communication over wireless channels. ...
متن کاملSub-optimal Estimation of HIV Time-delay Model using State-Dependent Impulsive Observer with Time-varying Impulse Interval: Application to Continuous-time and Impulsive Inputs
Human Immunodeficiency Virus (HIV) weakens the immune system in confronting various diseases by attacking to CD4+T cells. In modeling HIV behavior, the number of CD4+T cells is considered as the output. But, continuous-time measurement of these cells is not possible in practice, and the measurement is only available at variable intervals that are several times bigger than sampling time. In this...
متن کاملPOWER CONTROL AND RESOURCE ALLOCATION FOR DELAY-CONSTRAINED COMMUNICATIONS By XIAOCHEN LI A DISSERTATION PRESENTED TO THE GRADUATE SCHOOL OF THE UNIVERSITY OF FLORIDA IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY
of Dissertation Presented to the Graduate School of the University of Florida in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy POWER CONTROL AND RESOURCE ALLOCATION FOR DELAY-CONSTRAINED COMMUNICATIONS By Xiaochen Li August 2009 Chair: Dapeng Oliver Wu Major: Electrical and Computer Engineering Real-time applications such as streaming multimedia will be supporte...
متن کاملConstrained Controller Design for Real-time Delay Recovery in Metro Systems
This study is concerned with the real-time delay recovery problem in metro loop lines. Metro is the backbone of public transportation system in large cities. A discrete event model for traffic system of metro loop lines is derived and presented. Two effective automatic controllers, linear quadratic regulator (LQR) and model predictive controller (MPC), are used to recover train delays. A newly-...
متن کامل