DETERMINATION OF A QUALITY INDUCED TERMINATION RATE OF COMMUNICATION SESSIONS

• US 20140317288A1
• Filed: 01/05/2012
• Published: 10/23/2014
• Est. Priority Date: 01/05/2012
• Status: Active Grant

• Current Assignee: VOIPFUTURE GmbH (Jan Bastian Asset Management GmbH)
• Original Assignee: VOLP Future GmbH
• Inventors: Krueger, Michael, Scholz, Hendrik, Wallbaum, Michael
• Granted Patent: US 9,236,559 B2
• Time in Patent Office: Days
• US Class Current: 709/224
• CPC Class Codes: H04L 41/5025 by proactively reacting to service quality change, e.g. by reconfiguration after service quality degradation or upgrade
• CPC Class Codes: H04L 41/5067 Customer-centric QoS measurements
• CPC Class Codes: H04L 41/5087 wherein the managed service relates to voice services management of VoIP services H04M7/0081
• CPC Class Codes: H04L 43/08 Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
• CPC Class Codes: H04L 43/12 Network monitoring probes
• CPC Class Codes: H04L 65/1083 In-session procedures
• CPC Class Codes: H04L 65/60 Network streaming of media packets
• CPC Class Codes: H04L 65/80 Responding to QoS
• CPC Class Codes: H10N 50/10 Magnetoresistive devices

Abstract

This invention relates to methods and an apparatus for detecting quality induced terminations of media streams of real-time communication sessions within a packet-switched network. To enable the determination of the quality of live media streams passing by the tapping points in a network, and to use this information to determine media transmissions being aborted due to bad quality the invention evaluates quality data records of a terminated media stream to detect, whether the media stream was terminated due to bad quality or another reason. Advantageously, a threshold number of quality data records that were generated for the media stream just before termination thereof are considered in the evaluation. In case each of this threshold number of quality data records yields a bad quality of the media stream, the termination of the media stream may be judged or assumed to be induced due to bad quality.

Claims

1. A method for detecting quality induced terminations of media streams of real-time communication sessions within a packet-switched network, the method comprising:

monitoring by a passive monitoring system a plurality of media streams, wherein monitoring comprises generating, for pre-configured time intervals, quality data records for each monitored media stream, wherein each quality data record is indicative of an estimated media stream quality of the respective media stream within the respective pre-configured time interval, and

in response to detecting termination of one of the media streams, determining a quality induced termination of said one terminated media stream, in case a predetermined threshold number of the lastly generated quality data records for said one terminated media stream are indicative of an estimated media stream quality below a media stream quality threshold level.

2. The method according to claim 1, wherein monitoring a plurality of media streams received by the real-time passive monitoring system comprises:

determining transport-related metrics for each of the media streams for respective pre-configured time intervals and

estimating the media stream quality for each of the media streams within each respective pre-configured time interval.

3. The method according to claim 2, wherein the estimated media stream quality is an estimated speech quality.

4. The method according to claim 3, wherein the step of estimating the media stream quality comprises determining a Mean Opinion Score (MOS) or R-factor value for each media stream in each pre-configured time interval, and

a quality induced termination of a media stream is determined based on the Mean Opinion Score (MOS) or R-factor value.

5. The method according to claim 2, wherein estimated media stream quality is an estimated transport quality determined based on at least one of packet loss, jitter, deviations in packet inter-arrival times, packet delay, and sequence errors in the received packet sequence.

6. The method according to claim 1, further comprising:

calculating the media stream termination ratio of the number of media streams, the termination of which is determined to be quality induced, and the number of media streams, the termination of which is not determined to be quality induced,

generating an alert in case the media stream termination ratio exceeds a predetermined termination ratio.

7. The method according to claim 6, wherein the media stream termination ratio is calculated for media streams conveying video data only or for media streams conveying voice data only.

8. The method according to claim 6, wherein the media stream termination ratio is calculated in intervals.

9. The method according to claim 1, further comprising:

maintaining a media stream context for each media stream, wherein a quality induced termination indicator that indicates whether termination of the respective media stream has been determined to be quality induced or not is added to the media stream context upon termination of the respective media stream.

10. The method according to claim 8, wherein the monitored media streams belong to different communication sessions and the method further comprises:

correlating for each terminated communication session the media stream contexts of the media streams belonging to each respective terminated communication session,

for each terminated communication session, judging the termination of a respective communication session to be quality induced, in case at least one media stream context of a media stream being active upon termination of said respective terminated communication session indicates a quality induced termination, and, otherwise, judging the termination of said respective communication session not to be quality induced,

calculating the communication session termination ratio of the number of communication session the termination of which is judged to be quality induced, and the number of media streams, the termination of which is judged not to be quality induced,

generating an alert in case the communication session termination ratio exceeds a predetermined termination ratio.

11. The method according to claim 10, wherein the communication session termination ratio is calculated in intervals.

12. The method according to claim 9, wherein the media stream context further comprises quality data records of a respective terminated media stream that indicate the estimated speech quality for the respective predetermined time interval of a respective quality data record to be below said quality threshold level and

the step of determining a quality induced termination of said one terminated media stream comprises determining whether there is a predetermined number of lastly generated and consecutive quality data records comprised in the media stream context of said one terminated media stream that each indicate the estimated speech quality to be below said quality threshold, and if so, determining that the termination of said one terminated media stream is quality induced.

13. The method according to claim 1, wherein the step of monitoring the plurality of media streams comprises:

determining, upon the generation of a new quality data record for a respective media stream of said plurality of media streams, whether the estimated media stream quality of the respective media stream indicated by said new quality data record is below said quality threshold level or not,

incrementing a counter value for said respective media stream, in case the estimated media stream quality of said respective media stream indicated by said new quality data record is below said quality threshold level,

resetting the counter value for said respective media stream to zero, in case the estimated media stream quality of said respective media stream indicated by said new quality data record is not below said quality threshold level, and

wherein the step of determining a quality induced termination of said one terminated media stream determines a quality induced termination of said one terminated media stream, in case the counter value for said one terminated media stream is higher than said predetermined threshold number.

14. The method according to claim 13, wherein the media stream context further comprises quality data records of a respective terminated media stream that indicate the estimated media stream quality for the respective pre-configured time interval of a respective quality data record to be below said quality threshold level.

15. The method according to claim 1, wherein the pre-configured time intervals in which quality data records are generated for the plurality of media streams are time aligned for the plurality of media streams.

16. An apparatus for detecting quality induced terminations of media streams of real-time communication sessions within a packet-switched network, the apparatus comprising:

a monitoring unit configured to monitor a plurality of media streams, wherein monitoring unit is adapted to generate, for pre-configured time intervals, quality data records for each monitored media stream, wherein each quality data record is indicative of an estimated media stream quality of the respective media stream within the respective pre-configured time interval, and

a determination unit configured to determine, in response to detecting termination of one of the media streams, a quality induced termination of said one terminated media stream, in case a predetermined threshold number of the lastly generated quality data records for said one terminated media stream are indicative of an estimated media stream quality below a media stream quality threshold level.

17. The apparatus according to claim 16, wherein the apparatus is a monitoring probe or a session border controller, a media gateway or a Real-time Transport Protocol (RTP) aware network device.

18. A passive monitoring system for detecting quality induced terminations of media streams of real-time communication session within a packet-switched network, the passive monitoring system comprising:

one or more monitoring units configured to monitor a plurality of media streams, wherein monitoring unit is adapted to generate, for pre-configured time intervals, quality data records for each monitored media stream, wherein each quality data record is indicative of an estimated media stream quality of the respective media stream within the respective pre-configured time interval, and

a determination unit configured determine, in response to detecting termination of one of the media streams, a quality induced termination of said one terminated media stream, in case a predetermined threshold number of the lastly generated quality data records for said one terminated media stream are indicative of an estimated media stream quality below a media stream quality threshold level.

19. The passive monitoring system according to claim 18, wherein the monitored media streams belong to different communication sessions and the passive monitoring system further comprises:

a correlation unit configured to correlate for each terminated communication session the media stream contexts of the media streams belonging to each respective terminated communication session,

a processing unit configured to judge, for each terminated communication session, the termination of a respective communication session to be quality induced, in case at least one media stream context of a media stream being active upon termination of said respective terminated communication session indicates a quality induced termination, and, otherwise, judging the termination of said respective communication session not to be quality induced,

a calculation unit configured to calculate the communication session termination ratio of the number of communication sessions the termination of which is judged to be quality induced, and the number of communication sessions, the termination of which is judged not to be quality induced,

an alarm generation unit configured to generate an alert in case the communication session termination ratio exceeds a predetermined termination ratio.

20. A computer-readable medium storing instructions that, when executed by a processor of an apparatus, cause the apparatus to detect quality induced terminations of media streams of real-time communication sessions within a packet-switched network, by performing the following:

monitoring by a passive monitoring system a plurality of media streams, wherein monitoring comprises generating, for pre-configured time intervals, quality data records for each monitored media stream, wherein each quality data record is indicative of an estimated media stream quality of the respective media stream within the respective pre-configured time interval, and

in response to detecting termination of one of the media streams, determining a quality induced termination of said one terminated media stream, in case a predetermined threshold number of the lastly generated quality data records for said one terminated media stream are indicative of an estimated media stream quality below a media stream quality threshold level.

21. (canceled)