6th International ICST Symposium on Modeling and Optimization

Research Article

Cross-Layer Adaptive Design for the Frame Length of IEEE 802.11 Networks

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  • @INPROCEEDINGS{10.4108/ICST.WIOPT2008.2994,
        author={Feng Zeng and John Nelson},
        title={Cross-Layer Adaptive Design for the Frame Length of IEEE 802.11 Networks},
        proceedings={6th International ICST Symposium on Modeling and Optimization},
        publisher={IEEE},
        proceedings_a={WIOPT},
        year={2008},
        month={8},
        keywords={Computer networks Cross layer design Design engineering Fading Media Access Protocol Physical layer Power engineering and energy Power engineering computing Throughput Wireless networks},
        doi={10.4108/ICST.WIOPT2008.2994}
    }
    
  • Feng Zeng
    John Nelson
    Year: 2008
    Cross-Layer Adaptive Design for the Frame Length of IEEE 802.11 Networks
    WIOPT
    IEEE
    DOI: 10.4108/ICST.WIOPT2008.2994
Feng Zeng1,*, John Nelson1,*
  • 1: Department of Electronic and Computer Engineering, University of Limerick, Limerick, Ireland.
*Contact email: feng.zheng@ul.ie, john.nelson@ul.ie

Abstract

In this paper, we study the cross-layer (between MAC and PHY) design problem for IEEE 802.11 wireless networks. It is focused on the design of the optimal length of the frame body. The following results are obtained: 1) The optimal length of the frame body in logarithmic scale, expressed as log Lf,opt, can be coarsely approximated by a linear function of the signal-to-noise power ratio (SNR) Eb/N0 (in dB) and finely approximated by a second-order polynomial of Eb/N0; 2) The coefficients of the aforementioned approximation functions depend only on the data transmission rate and other parameters specified in the protocol, and they do not depend on the access mechanisms; 3) The number of active nodes has little effect on Lf,opt, especially in the range of both low and high SNR; 4) The system throughput is sensitive to the length of the frame body Lf when the SNR is low, while it is insensitive to Lf in a considerably large neighborhood of Lf,opt when the SNR is high; and 5) Fragmentation can always increase the system throughput, but the increasing rate is conspicuous only in the low SNR regime.