Predictive shaping for VBR MPEG video traffic transmission over ATM networks

  • L. de la Cruz
  • J. J. Alins
  • J. Mata
Part of the IFIP — The International Federation for Information Processing book series (IFIPAICT)


The use of smoothing techniques to remove the periodic fluctuations of the bit rate generated by the codification modes of the MPEG algorithm is very suitable in video transmission. In this way, the multiplexing gain is maximized and the resource allocation is reduced in ATM Networks. The traffic smoothing can be achieved storing the cells in a buffer. This buffer is allocated between the coder and the user-interface. To reduce the delay introduced in the storage process a new technique to forecast the VBR MPEG traffic is presented. This technique is based on the characterization of bits per frame generated by the MPEG coder as an ARIMA process. In this study the invariance of the ARIMA coefficients is verified for all coded sequences used. In addition, these coefficients are invariant also in front of the changes of the selected image quality in the coder. This characterization allows to propose a new traffic shaper scheme when forecast techniques are applied. Moreover, numerical results allows to compare the smoothing effects introduced, as well as the delays for the classic shaper and the predictive shaper.


ATM networks MPEG video traffic ARIMA process traffic shaping 


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Copyright information

© Springer Science+Business Media Dordrecht 1998

Authors and Affiliations

  • L. de la Cruz
    • 1
  • J. J. Alins
    • 1
  • J. Mata
    • 1
  1. 1.Department of Applied Mathematics and TelematicsPolytechnic University of CataloniaBarcelonaSpain

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