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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Available Bandwidth Measurement Method Considering Idle Period and Transmission Overheads in IEEE 802.11b DCF Wireless LANs

IEEE 802.11b DCF 무선랜 환경에서 휴지 기간과 전송 오버헤드를 고려한 가용대역폭 측정 방법

  • 구혜림 (아주대학교 일반대학원 컴퓨터공학과) ;
  • 하상용 (한국정보화진흥원) ;
  • 류기열 (아주대학교 정보컴퓨터공학부) ;
  • 노병희 (아주대학교 정보통신전문대학원)
  • Received : 2011.03.25
  • Accepted : 2011.06.23
  • Published : 2011.07.30
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Abstract

The lack of QoS (Quality of Service) support functionalities in IEEE 802.11 DCF mode makes it difficult to provide real-time multimedia services in WLANs. In this paper, we propose an effective available bandwidth measurement method in IEEE 802.11b DCF environments. The proposed method measures the total channel idle time and the collision probability during each measurement period. Then, the available bandwidth is calculated by considering those measured information and the transmission overheads at MAC and PRY layers. The performances of the proposed method are evaluated using OPNET simulator. The simulation results show that the proposed method provides more exact results than existing comparable schemes.

IEEE 802.11 DCF 모드는 QoS 제공 기능을 포함하고 있지 않으므로, 무선랜에서 실시간 멀티미디어 서비스들을 제공하는 것이 어렵다. 본 논문에서는 IEEE 802.11b DCF 환경에서 실시간 멀티미디어 서비스 제공의 기반이 되는 가용대역폭 측정을 위한 효과적인 방법을 제안한다. 제안 방법은 매 측정 기간마다 총 채널 휴지 시간과 충돌 확률을 측정한다. 그리고 이들 측정값들과 전송과정에서의 MAC과 PHY 계층에서의 오버헤드를 고려하여, 가용대역폭을 측정한다. 실험은 OPNET을 사용하여 수행되었으며, 실험 결과는 제안 방법에서 측정한 가용대역폭이 기존의 방법들 보다 더 정확한 결과값을 제공함을 보여준다.

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References

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