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Quality of experience determination for multi-party VoIP conference calls that account for focus degradation effects

  • US 9,232,048 B2
  • Filed: 12/04/2013
  • Issued: 01/05/2016
  • Est. Priority Date: 12/04/2013
  • Status: Expired due to Fees
First Claim
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1. A system for improved QoE multi-party conference calls comprising:

  • a multi-party VoIP conference call system configured to facilitate an exchange of signals between at least three parties over at least one network, said multi-party conference call system further comprising;

    a centralized focus component configured to receive and distribute said data signals among the at least three parties, wherein said centralized focus component utilizes a transcoding process when handling the data signals; and

    an improved quality of experience (QoE) manager configured to assess a QoE for each party when receiving a data signal, wherein the QoE is expressed as a corrected mean opinion score (MOS) that accounts for degradation effects introduced by the transcoding process of the centralized focus component, wherein a determination of the corrected MOS is based upon an E-Model R-Factor equation, wherein the improved QoE manager further comprises;

    a focus-effect table containing a set of predetermined focus-effect coefficients for a plurality of codecs used by the multi-party conference call system; and

    a correction function that calculates the corrected MOS based upon a MOS calculated using the E-Model R-Factor equation and the set of predetermined focus-effect coefficients from the focus-effect table that correspond to a codec being used for the receiving party, wherein the correction function is expressed as
    MOSc=x1*MOS3+x2*MOS2+x3*MOS+x4, 

    wherein MOSc is the corrected MOS, x1, x2, x3, and x4 correspond to the set of predetermined focus-effect coefficients for the codec used for the receiving party, and MOS corresponds to the MOS calculated using the R-Factor equation.

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