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Sampling test of network performance

  • US 7,990,887 B2
  • Filed: 02/22/2006
  • Issued: 08/02/2011
  • Est. Priority Date: 02/22/2006
  • Status: Active Grant
First Claim
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1. A method for testing a communication network, comprising:

  • generating a flow of test packets, the flow comprising a series of bursts of the test packets separated by intervals having an interval duration, each burst comprising a sequence of the test packets and having a burst duration less than the interval duration, wherein generating the flow comprises generating a test packet having a packet size and data rate chosen according to a predetermined codec used in Voice over Internet Protocol (VoIP);

    transmitting the flow of test packets over a path through the network;

    measuring arrival characteristics of the test packets in the flow at a receiving end of the path, the arrival characteristics comprising at least one of a packet loss characteristic, a packet delay characteristic, and a packet jitter characteristic; and

    detecting a quality defect in the network based on the measured arrival characteristics;

    said detecting a quality defect by computing a statistical feature of said arrival characteristics of the test packets over said series of bursts while disregarding the arrival characteristics of an initial test packet in each burst;

    computing, for the predetermined codec, a Mean Opinion Score (MOS) for each burst based on the arrival characteristics of the test packets thereof;

    determining the percentage of bursts in the series for which a corresponding MOS is above a predetermined threshold; and

    determining whether call quality over the communication network is inadequate based on a percentage of bursts in the series for which the corresponding MOS is lower than the predetermined threshold.

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