A new weighted proportional fair scheduling algorithm for SDMA/OFDMA systems

Author

Huang, Wei ; Sun, Kai ; Bo, Tan

Author_Institution

Coll. of Electron. Inf. Eng., Inner Mongolia Univ., Hohhot

fYear

2008

fDate

25-27 Aug. 2008

Firstpage

538

Lastpage

541

Abstract

A new and efficient radio resource allocation and scheduling algorithm for SDMA/OFDMA systems with downlink zero-forcing beamforming is proposed to support the diverse quality of service (QoS) requirements of heterogeneous services. In particular, a unified urgent weight is given by taking into account QoS requirements (i.e., delay deadline, minimum data rate), queue length and user fairness. The subcarrier is dynamically allocated to the user with the highest priority. Then the remaining users on the same carrier are selected based on the semi-orthogonal user selection scheme. Finally, allocating the transmit power with a greedy method to the spatial subchannels is implemented. The goal of the algorithm is to maximize the system throughput by fully exploiting multiuser diversity gain in space, time, and frequency domain while guaranteeing the QoS for real time (NT) services with delay deadline requirement and non-real time (NRT) services with minimum data rate requirement.

Keywords

OFDM modulation; diversity reception; frequency division multiple access; multiuser channels; quality of service; resource allocation; scheduling; space division multiple access; QoS requirements; SDMA-OFDMA systems; downlink zero-forcing beamforming; frequency domain; greedy method; heterogeneous services; multiuser diversity gain; orthogonal frequency division multiple access; quality of service; queue length; radio resource allocation; semi-orthogonal user selection scheme; space division multiple access; space domain; spatial subchannels; time domain; user fairness; weighted proportional fair scheduling algorithm; Array signal processing; Delay; Diversity methods; Downlink; Frequency domain analysis; Multiaccess communication; Quality of service; Resource management; Scheduling algorithm; Throughput;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications and Networking in China, 2008. ChinaCom 2008. Third International Conference on

Conference_Location

Hangzhou

Print_ISBN

978-1-4244-2373-6

Electronic_ISBN

978-1-4244-2374-3

Type

conf

DOI

10.1109/CHINACOM.2008.4685083

Filename

4685083