Quality of service monitor for multimedia communications system
First Claim
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1. A method for automatically estimating the subjective quality of a multimedia signal transmitted over a packet connection during a single call, comprising the steps of:
- (a) during a single call determining the statistical distribution of the time spent by said packet connection in at least a low packet loss probability state and a high packet loss probability state, and (b) during that same single call determining the effect of said statistical distribution on the estimated subjective quality of said multimedia signal.
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Abstract
A subjective quality monitoring system for packet based multimedia signal transmission systems estimates the parameters of a statistical model representing the probabilities of said packet based transmission system being in a low loss state or a high loss state and uses said estimates to predict the subjective quality of the multimedia signal. The quality monitoring system comprises a plurality of quality monitoring functions located at the multimedia to packet conversion points.
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Citations
19 Claims
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1. A method for automatically estimating the subjective quality of a multimedia signal transmitted over a packet connection during a single call, comprising the steps of:
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(a) during a single call determining the statistical distribution of the time spent by said packet connection in at least a low packet loss probability state and a high packet loss probability state, and (b) during that same single call determining the effect of said statistical distribution on the estimated subjective quality of said multimedia signal. - View Dependent Claims (2, 3, 4, 5, 6)
(a) determining the level of one or more impairments, said one or more impairments being selected from the group consisting of jitter and delay and packet error rate and CODEC distortion, and (b) determining the estimated effect of said one or more impairments on the subjective quality of said multimedia signal.
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3. A method as defined in claim 2, further comprising the step of reporting an estimated subjective quality to a central database system following the termination of said multimedia signal.
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4. A method as defined in claim 2, further comprising the steps of comparing said estimated subjective quality to a threshold and sending an event message to a central management system if said subjective quality is below said threshold.
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5. A method as defined in claim 2, further comprising the insertion of a representation of the estimated subjective quality of the received multimedia signal into transmitted voice packets.
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6. A method as defined in claim 2, further comprising the periodic updating of a counter wherein:
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(i) when the estimated subjective quality is low, said counter is reduced by an amount dependent on said subjective quality, and (ii) when the estimated subjective quality is high, said counter is increased.
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7. A system for automatically estimating the subjective quality of a multimedia signal transmitted over a packet network during a single call wherein the multimedia signal connects two or more multimedia signal to packet conversion points and one or more of said conversion points are physically grouped within an enclosure, comprising a plurality of quality monitors for performing monitoring functions wherein:
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(a) each of said functions, performed by said quality monitors one of said conversion points and each of said quality monitors is contained within the same enclosure as said conversion point;
(b) each of said functions estimates the subjective quality resulting from the conversion of received packets to a multimedia signal performed by said conversion point during a single call. - View Dependent Claims (8, 9, 10, 11, 12, 13)
(a) determines the statistical distribution of the time spent by said packet connection in at least a low packet loss probability state and a high packet loss probability state, and (b) determines the estimated effect of said statistical distribution on the subjective quality of said multimedia signal. -
9. A system as defined in claim 8, wherein the quality monitors for performing monitoring function:
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(a) determines the level of one or more impairments, said one or more impairments being selected from the group consisting of jitter and delay and packet error rate and CODEC distortion, and (b) determines the estimated effect of said one or more impairments on the subjective quality of said multimedia signal.
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10. A system as defined in claim 8, wherein the quality monitors for performing monitoring function reports the estimated subjective quality of the multimedia signal to a central database system following the termination of said multimedia signal.
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11. A system as defined in claim 8, wherein the quality monitors for performing monitoring function compares the estimated subjective quality of the multimedia signal to a threshold and sends an event message to a central management system if said subjective quality is below said threshold.
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12. A system as defined in claim 8, wherein the quality monitors for performing monitoring function inserts a representation of the estimated subjective quality of the received multimedia signal into transmitted voice packets.
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13. A system as defined in claim 8, wherein the quality monitors for performing monitoring function contains a counter wherein:
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(a) when the estimated subjective quality is low, said counter is reduced by an amount dependent on said subjective quality, and (b) when the estimated subjective quality is high, said counter is increased.
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14. A system for automatically estimating the subjective quality of a multimedia signal transmitted over a packet connection during a single call, comprising:
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(a) a means for determining the statistical distribution during a single call of the time spent by said packet connection in at least a low packet loss probability state and a high packet loss probability state, and (b) a means for determining the effect of said statistical distribution during that same single call on the estimated subjective quality of said multimedia signal. - View Dependent Claims (15, 16, 17, 18, 19)
(a) a means for determining the level of one or more impairments, said one or more impairments being selected from the group consisting of jitter and delay and packet error rate and CODEC distortion, and (b) a means for determining the estimated effect of said one or more impairments on the subjective quality of said multimedia signal.
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16. A system as defined in claim 15, further comprising;
- a means for reporting an estimated subjective quality to a central database system following the termination of said multimedia signal.
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17. A system as defined in claim 15, further comprising;
- a means for comparing said estimated subjective quality to a threshold and sending an event message to a central management system if said subjective quality is below said threshold.
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18. A system as defined in claim 15, further comprising;
- a means for inserting a representation of the estimated subjective quality of the received multimedia signal into transmitted voice packets.
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19. A system as defined in claim 15, further comprising;
- a means for periodically updating a counter wherein;
(i) when the estimated subjective quality is low, said counter is reduced by an amount dependent on said subjective quality, and (ii) when the estimated subjective quality is high, said counter is increased.
- a means for periodically updating a counter wherein;
Specification