Opportunistic Scheduling with Economized CSI Feedback for OFDMA/TDD Downlink Systems

Yao-Hsing Chung, Chung-Ju Chang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

In this paper we propose an economized-CSI (channel state information) opportunistic scheduling (ECOS) scheme for OFDMA/TDD downlink systems. The ECOS scheme consists of a quality-of-service (QoS) guarantee scheduling (QGS) algorithm and a CSI overhead reduction (COR) algorithm. The QGS algorithm guarantees QoS requirements by adjusting priority value and anticipated rate of users dynamically. In addition, it achieves balance between QoS guarantee and throughput maximization by employing a priority threshold. The COR algorithm performs admissible user selection to economize the amount of CSI overhead. Since all users do not need to feed back CSI every frame, the transmission power used for CSI reporting is economized. Besides, the COR algorithm can reduce the computation complexity of the QGS algorithm because the number of users to be scheduled is reduced. Simulation results show that the proposed ECOS scheme greatly reduces the uplink bandwidth occupancy of CSI feedback. Also, it achieves high system throughput and maintains QoS guarantee at high traffic load.
Original languageEnglish
Title of host publication2009 IEEE 20TH INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS
PublisherIEEE
Pages1391-1395
Number of pages5
ISBN (Print)978-1-4244-5123-4
DOIs
StatePublished - 2009
Event20th IEEE Symposium on Personal, Indoor and Mobile Radio Communications - Tokyo, Japan
Duration: 13 Sep 200916 Sep 2009

Conference

Conference20th IEEE Symposium on Personal, Indoor and Mobile Radio Communications
CountryJapan
CityTokyo
Period13/09/0916/09/09

Keywords

  • CHANNEL-STATE-FEEDBACK

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