The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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An Efficient Downlink Scheduling Scheme Using Prediction of Channel State in an OFDMA-TDD System

OFDMA-TDD 시스템에서 채널상태 예측을 이용한 효율적인 하향링크 스케줄링 기법

  • 김세진 (고려대학교 컴퓨터정보학과 데이터통신및네트워크 연구실) ;
  • 원정재 (삼성전자 통신연구소) ;
  • 이형우 (고려대학교 전자및정보공학부 B-ISDN 연구실) ;
  • 조충호 (고려대학교 컴퓨터정보학과 데이터통신및네트워크 연구실)
  • Published : 2006.05.01
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Abstract

In this paper, we propose a novel scheduling algorithm for downlink transmission which utilizes scarce wireless resource efficiently in an Orthogonal Frequency Division Multiple Access/Time Division Duplex system. Scheduling schemes which exploit channel information between a Base Station and terminals have been proposed recently for improved performance. Time series analysis is used to estimate the channel state of mobile terminals. The predicted information is then used for prioritized scheduling of downlink transmissions for improved throughput, delay and jitter performance. Through simulation, we show that the total throughput and mean delay of the proposed scheduling algorithm are improved compared with those of the Proportional Fairness and Maximum Carrier to Interference Ratio schemes.

본 논문에서는 Orthogonal Frequency Division Multiple Access/Time Division Duplex 시스템에서 한정된 하향링크 무선 자원을 효율적으로 이용하고, 시스템 성능을 높이는 스케줄링 기법을 제안하였다. 시계열 예측 알고리즘을 이용하여 향후 변화될 기지국과 단말들 사이의 채널상태를 예측하고, 이 예측된 정보를 무선 자원 할당의 우선순위를 결정하는데 이용하였다. 시뮬레이션을 통해 제안하는 알고리즘의 성능을 분석하였고, 시스템 처리율과 지연시간에서 Proportional Fairness, 그리고 Maximum Carrier to Interference Ratio 알고리즘과 비교 평가하였다.

Keywords

References

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