Methods and apparatus for non-intrusive measurement of delay variation of data traffic on communication networks
First Claim
1. A method of measuring delay variation of data traffic traversing at least first and second points on a communication network, the data traffic comprising protocol data units (PDUs), the method comprising:
- (a) generating first PDU identifiers of PDUs observed at the first point and generating corresponding first timestamps indicating observation times of the PDUs at the first point;
(b) generating second PDU identifiers of PDUs observed at the second point and generating corresponding second timestamps indicating observation times of the PDUs at the second point; and
(c) computing, from first and second timestamps having matching PDU identifiers, a measure of variation indicating a delay variation of PDUs between the first and second points.
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Abstract
A technique for measuring delay variation (jitter) of data traffic (protocol data units (PDUs)) traversing a communication network involves: generating first PDU identifiers of PDUs observed at a first point and corresponding first timestamps indicating observation times of the PDUs at the first point; generating second PDU identifiers of PDUs observed at a second point and corresponding second timestamps indicating observation times of the PDUs at the second point; and computing, from first and second timestamps having matching PDU identifiers, a measure of variation indicating a delay variation of PDUs between the first and second points. The computation can include computing first time differences between observation times of the PDUs at the first point from the first timestamps, computing second time differences between observation times of the PDUs at the second point from the second timestamps, and computing differences between corresponding first and second time differences having matching PDU identifiers.
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Citations
27 Claims
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1. A method of measuring delay variation of data traffic traversing at least first and second points on a communication network, the data traffic comprising protocol data units (PDUs), the method comprising:
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(a) generating first PDU identifiers of PDUs observed at the first point and generating corresponding first timestamps indicating observation times of the PDUs at the first point;
(b) generating second PDU identifiers of PDUs observed at the second point and generating corresponding second timestamps indicating observation times of the PDUs at the second point; and
(c) computing, from first and second timestamps having matching PDU identifiers, a measure of variation indicating a delay variation of PDUs between the first and second points. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for measuring delay variation of data traffic traversing at least first and second points on a communication network, the data traffic comprising protocol data units (PDUs), the apparatus comprising:
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a first probe configured to generate first PDU identifiers of PDUs observed at the first point and to generate corresponding first timestamps indicating observation times of the PDUs at the first point;
a second probe configured to generate second PDU identifiers of PDUs observed at the second point and to generate corresponding second timestamps indicating observation times of the PDUs at the second point; and
a processor configured to compute, from first and second timestamps having matching PDU identifiers, a measure of variation indicating a delay variation of PDUs between the first and second points. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification