Journal of Korean Institute of Industrial Engineers (대한산업공학회지)

Korean Institute of Industrial Engineers (대한산업공학회)
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MAC Performance Improvement by Selective Use of DCF and PCF Protocols for IEEE 802.11 Wireless LANs

무선랜에서 망 상태에 따른 DCF와 PCF 프로토콜의 선택적인 사용을 통한 MAC 성능 향상

  • Choi, Woo-Yong (Department of Industrial and Management Systems Engineering, Dong-A University)
  • 최우용 (동아대학교 산업경영공학과)
  • Received : 2011.03.07
  • Accepted : 2011.05.13
  • Published : 2011.06.01
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Abstract

The distributed coordination function (DCF) and point coordination function (PCF) protocols are the basic MAC protocols for legacy IEEE 802.11, IEEE 802.11a, IEEE 802.11b, IEEE 802.11e, IEEE 802.11g and IEEE 802.11n wireless LANs. When the DCF protocol is used for the various versions of IEEE 802.11 wireless LANs, the MAC performance seriously degrades due to the collisions among the stations (STAs) as more and more STAs attempt to transmit their data frames. On the other hand, the PCF MAC performance becomes poor when many STAs exist in IEEE 802.11 wireless LANs, however, only small number of STAs actually attempt to transmit their data frames. In this paper, we propose the algorithm for improving the MAC performance by selectively using the DCF and PCF protocols according to the state of IEEE 802.11 wireless LANs. Numerical examples are presented to show the MAC performance improvement by the selective use of the DCF and PCF protocols according to the network state.

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References

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