Dynamic Resource Allocation for Real-Time Services in Cooperative OFDMA Systems

Author

Zhang, Danhua ; Tao, Xiaoming ; Lu, Jianhua ; Wang, Meng

Author_Institution

Dept. of Electron. Eng., Tsinghua Univ., Beijing, China

Volume

15

Issue

5

fYear

2011

fDate

5/1/2011 12:00:00 AM

Firstpage

497

Lastpage

499

Abstract

We investigate the resource allocation problem in heterogeneous cooperative OFDMA systems. In contrast to existing literature, which mainly focuses on best effort (BE) services or non-real-time (nRT) services, we consider real-time (RT) services with strict delay and rate requirements. Exploiting the wireless channel and queue information, a utility-based optimization problem is formulated for dynamic subcarrier allocation and relay selection supporting mixed BE and RT services. An efficient heuristic algorithm is proposed to solve the problem and simulation results show that our algorithm can effectively improves average delay performance and RT services support.

Keywords

OFDM modulation; cooperative communication; frequency division multiple access; resource allocation; wireless channels; best effort services; dynamic resource allocation; dynamic subcarrier allocation; heterogeneous cooperative OFDMA systems; nonreal-time services; orthogonal frequency division multiple access; queue information; real-time services; relay selection; utility-based optimization problem; wireless channel; Complexity theory; Delay; Dynamic scheduling; Heuristic algorithms; Real time systems; Relays; Resource management; OFDMA; Relays; real-time services; schedule;

fLanguage

English

Journal_Title

Communications Letters, IEEE

Publisher

ieee

ISSN

1089-7798

Type

jour

DOI

10.1109/LCOMM.2011.031411.101843

Filename

5738915