Opportunistic power scheduling for dynamic multi-server wireless systems

Author

Lee, Jang-Won ; Mazumdar, Ravi R. ; Shroff, Ness B.

Author_Institution

Dept. of Electr. & Electron. Eng., Yonsei Univ., Seoul

Volume

5

Issue

6

fYear

2006

fDate

6/1/2006 12:00:00 AM

Firstpage

1506

Lastpage

1515

Abstract

In this paper, we present an opportunistic power scheduling scheme, i.e., a joint time-slot and power allocation scheme for downlink communication in wireless systems. Unlike past works, we allow multiple transmissions in a time-slot that could potentially interfere with each other. These multiple transmissions are allowed to achieve high system efficiency. Hence, it is important to not only select the mobiles to be scheduled in a time-slot, but also to allocate an appropriate transmission power level to these scheduled mobiles. We model the time-varying wireless channel as a stochastic process and formulate a stochastic optimization problem that attempts to maximize the expected total system utility with general constraints on performance or fairness. The power scheduling algorithm is obtained by using stochastic duality and implemented via stochastic subgradient techniques

Keywords

gradient methods; mobile radio; optimisation; scheduling; stochastic processes; time-varying channels; wireless channels; downlink communication; dynamic multiserver wireless systems; opportunistic power scheduling; power allocation scheme; stochastic optimization problem; stochastic process; stochastic subgradient techniques; time-varying wireless channel; Constraint optimization; Downlink; Dynamic scheduling; Mobile communication; Power system modeling; Scheduling algorithm; Stochastic processes; Stochastic systems; Time varying systems; Wireless communication;

fLanguage

English

Journal_Title

Wireless Communications, IEEE Transactions on

Publisher

ieee

ISSN

1536-1276

Type

jour

DOI

10.1109/TWC.2006.1638671

Filename

1638671