6th International Conference on Performance Evaluation Methodologies and Tools

Research Article

Robust methods for LTE and WiMAX dimensioning

Download474 downloads
  • @INPROCEEDINGS{10.4108/valuetools.2012.250209,
        author={Laurent Decreusefond and Eduardo Ferraz and Philippe Martins and Than tung Vu},
        title={Robust methods for LTE and WiMAX dimensioning},
        proceedings={6th International Conference on Performance Evaluation Methodologies and Tools},
        publisher={IEEE},
        proceedings_a={VALUETOOLS},
        year={2012},
        month={11},
        keywords={concentration inequality edgeworth expansion lte ofdma},
        doi={10.4108/valuetools.2012.250209}
    }
    
  • Laurent Decreusefond
    Eduardo Ferraz
    Philippe Martins
    Than tung Vu
    Year: 2012
    Robust methods for LTE and WiMAX dimensioning
    VALUETOOLS
    ICST
    DOI: 10.4108/valuetools.2012.250209
Laurent Decreusefond1,*, Eduardo Ferraz1, Philippe Martins1, Than tung Vu1
  • 1: Télécom ParisTech
*Contact email: laurent.decreusefond@telecom-paristech.fr

Abstract

This paper proposes an analytic model for dimensioning OFDMA based networks like WiMAX and LTE systems. In such a system, users require a number of subchannels which depends on their \SNR, hence of their position and the shadowing they experience. The system is overloaded when the number of required subchannels is greater than the number of available subchannels. We give an exact though not closed expression of the loss probability and then give an algorithmic method to derive the number of subchannels which guarantees a loss probability less than a given threshold. We show that Gaussian approximation lead to optimistic values and are thus unusable. We then introduce Edgeworth expansions with error bounds and show that by choosing the right order of the expansion, one can have an approximate dimensioning value easy to compute but with guaranteed performance. As the values obtained are highly dependent from the parameters of the system, which turned to be rather undetermined, we provide a procedure based on concentration inequality for Poisson functionals, which yields to conservative dimensioning. This paper relies on recent results on concentration inequalities and establish new results on Edgeworth expansions.