1、 INTERNATIONAL TELECOMMUNICATION UNION ITU-T H.460.9TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU Amendment 1(03/2004) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMSInfrastructure of audiovisual services Supplementary services for multimedia Support for online QoS-monitoring reporting within H.323 s
2、ystems Amendment 1: New Annex B: Extended performance metrics ITU-T Recommendation H.460.9 (2002) Amendment 1 ITU-T H-SERIES RECOMMENDATIONS AUDIOVISUAL AND MULTIMEDIA SYSTEMS CHARACTERISTICS OF VISUAL TELEPHONE SYSTEMS H.100H.199 INFRASTRUCTURE OF AUDIOVISUAL SERVICES General H.200H.219 Transmissio
3、n multiplexing and synchronization H.220H.229 Systems aspects H.230H.239 Communication procedures H.240H.259 Coding of moving video H.260H.279 Related systems aspects H.280H.299 Systems and terminal equipment for audiovisual services H.300H.349 Directory services architecture for audiovisual and mul
4、timedia services H.350H.359 Quality of service architecture for audiovisual and multimedia services H.360H.369 Supplementary services for multimedia H.450H.499 MOBILITY AND COLLABORATION PROCEDURES Overview of Mobility and Collaboration, definitions, protocols and procedures H.500H.509 Mobility for
5、H-Series multimedia systems and services H.510H.519 Mobile multimedia collaboration applications and services H.520H.529 Security for mobile multimedia systems and services H.530H.539 Security for mobile multimedia collaboration applications and services H.540H.549 Mobility interworking procedures H
6、.550H.559 Mobile multimedia collaboration inter-working procedures H.560H.569 BROADBAND AND TRIPLE-PLAY MULTIMEDIA SERVICES Broadband multimedia services over VDSL H.610H.619 For further details, please refer to the list of ITU-T Recommendations. ITU-T Rec. H.460.9 (2002)/Amd.1 (03/2004) i ITU-T Rec
7、ommendation H.460.9 Support for online QoS-monitoring reporting within H.323 systems Amendment 1 New Annex B: Extended performance metrics Summary This annex contains an improved set of Voice over IP call performance metrics that are consistent with those defined in the RTP Control Protocol Extended
8、 Reports (RTCP XR) RFC 3611. The use of a common set of metrics for QoS reporting via call control protocols and media path protocols lowers the complexity of end-systems and makes it easier to compare data when resolving service quality problems. Source Amendment 1 to ITU-T Recommendation H.460.9 w
9、as approved on 15 March 2004 by ITU-T Study Group 16 (2001-2004) under the ITU-T Recommendation A.8 procedure. ii ITU-T Rec. H.460.9 (2002)/Amd.1 (03/2004) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Te
10、lecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardizatio
11、n Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technolo
12、gy which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance
13、with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory
14、 language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of
15、this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the d
16、ate of approval of this Recommendation, ITU had received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult t
17、he TSB patent database. ITU 2004 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. ITU-T Rec. H.460.9 (2002)/Amd.1 (03/2004) iii CONTENTS Page B.1 Scope 1 B.2 References 1 B.3 Definitions 1 B.4 Abbreviations . 1
18、B.5 Parameter descriptions 1 B.6 ASN.1 definition. 4 B.7 Linkage to H.460.9 data . 5 ITU-T Rec. H.460.9 (2002)/Amd.1 (03/2004) 1 ITU-T Recommendation H.460.9 Support for online QoS-monitoring reporting within H.323 systems Amendment 1 New Annex B: Extended performance metrics B.1 Scope This annex de
19、scribes a set of Extended Performance Metrics for Voice over IP QoS reporting that provide more detailed insight into call quality and causes of degradation than basic RTCP statistics. The metrics described in this annex are consistent with those described in the RTCP XR Voice over IP Metrics Payloa
20、d described in IETF RFC 3611. B.2 References The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other r
21、eferences are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. The refere
22、nce to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T Recommendation G.107 (2003), The E-Model, a computational model for use in transmission planning. ITU-T Recommendation G.108 (1999), Application of the E-Model: A planning
23、guide. IETF RFC 3611 (2003), RTP Control Protocol Extended Reports (RTCP XR). B.3 Definitions N/A. B.4 Abbreviations This Recommendation uses the following abbreviations: MOSCQ Mean Opinion Score for Conversational Quality MOSLQ Mean Opinion Score for Listening Quality RTCP RTP Control Protocol RTCP
24、 XR RTCP Extended Reports RTP Real-time Transfer Protocol B.5 Parameter descriptions B.5.1 Network packet loss rate The proportion of packets lost since the start of transmission expressed as an 8-bit binary fraction obtained by dividing the number of packets lost in the transmission path by the tot
25、al number of packets expected and multiplying this value by 256 and taking the integer part. Thus a value of 0 2 ITU-T Rec. H.460.9 (2002)/Amd.1 (03/2004) would correspond to a packet loss rate of zero and a value of 64 would correspond to a packet loss rate of 0.25 (corresponding to 25 per cent). B
26、.5.2 Jitter buffer discard rate The proportion of packets discarded by the receiving jitter buffer since the start of transmission expressed as an 8-bit binary fraction obtained by dividing the number of packets discarded by the total number of packets expected and multiplying this value by 256 and
27、taking the integer part. B.5.3 Burst loss density The average proportion of packets both lost and discarded during burst periods expressed as an 8-bit binary fraction. This is obtained by dividing the sum of the number of packets lost in the transmission path and discarded by the jitter buffer durin
28、g burst periods by the total number of packets expected during burst periods, multiplying this value by 256 and taking the integer part. A burst is a period during which a high proportion of packets are either lost in transit or discarded due to late arrival. In general, a burst is likely to result
29、in audible degradation to call quality. A burst is defined as a longest sequence that: a) starts with a lost or discarded packet; b) does not contain any occurrences of Gmin or more consecutive received (and not discarded) packets; and c) ends with a lost or discarded packet. B.5.4 Gap loss density
30、The average proportion of packets lost and discarded during gap periods expressed as an 8-bit binary fraction. This is obtained by dividing the sum of the number of packets lost in the transmission path and discarded by the jitter buffer during gap periods by the total number of packets expected dur
31、ing gap periods, multiplying this value by 256 and taking the integer part. A gap is a period between bursts; the above burst definition means that during gaps the packet loss rate is low and lost/discarded packets are isolated and hence can be effectively masked by packet loss concealment algorithm
32、s. B.5.5 Burst duration The average length of burst periods expressed in milliseconds. B.5.6 Gap duration The average length of gap periods expressed in milliseconds. B.5.7 RTCP round-trip delay The round-trip delay between RTP instances, expressed in milliseconds. B.5.8 End system delay The end sys
33、tem delay, comprising encode, decode and jitter buffer delay, expressed in milliseconds. This may be combined with the RTCP Round-Trip Delay to estimate the overall Voice over IP segment round-trip delay. B.5.9 Signal level The ratio of the signal level to a 0 dBm0 reference, expressed in dBm0. B.5.
34、10 Noise level The ratio of the silent period background noise level to a 0 dBm0 reference, expressed in dBm0. ITU-T Rec. H.460.9 (2002)/Amd.1 (03/2004) 3 B.5.11 Residual echo return loss The echo return loss after the effects of echo cancellation, expressed in dB. B.5.12 Gmin A parameter used to de
35、fine bursts. This is by default set to 16, which sets the threshold packet loss rate between bursts and gaps to approximately 6%. B.5.13 R factor A value representing the receiving end call quality of this stream, calculated per ITU-T Rec. G.107. Table 1/G.108 provides interpretive information about
36、 the value of the R factor. B.5.14 External R factor A value representing the effects of an externally connected network, calculated per ITU-T Rec. G.107. Table 1/G.108 provides interpretive information about the value of the R factor. B.5.15 Estimated MOS-LQ An estimated receiving end Listening Qua
37、lity MOS, calculated per ITU-T Rec. G.107 and multiplied by 10. B.5.16 Estimated MOS-CQ An estimated receiving end Conversational Quality MOS, calculated per ITU-T Rec. G.107 and multiplied by 10. B.5.17 Packet loss concealment type Type of packet loss concealment algorithm in use. Indicates unknown
38、, silence insertion, “standard“ (i.e., per appropriate ITU Recommendation) and “enhanced“. B.5.18 Jitter buffer type Indication of whether the receiving jitter buffer is fixed, adaptive or unknown. B.5.19 Jitter buffer adaptation rate The adaptation rate for adaptive jitter buffers. This is defined
39、as the time taken in milliseconds adjusting to a step from 30 ms to 100 ms in peak-to-peak jitter divided by twice the frame size in milliseconds. This value need only be provided if the Jitter Buffer Type is specified. B.5.20 Jitter buffer nominal size The current nominal jitter buffer size for fix
40、ed or adaptive jitter buffers. This is expressed in milliseconds. This value need only be provided if the Jitter Buffer Type is specified. B.5.21 Jitter buffer max size The maximum jitter buffer size in milliseconds for fixed or adaptive jitter buffers. This value need only be provided if the Jitter
41、 Buffer Type is specified. B.5.22 Jitter buffer absolute max The maximum achievable size of the buffer in milliseconds for adaptive jitter buffers. This value need only be provided if the Jitter Buffer Type is specified. 4 ITU-T Rec. H.460.9 (2002)/Amd.1 (03/2004) B.6 ASN.1 definition QOS-MONITORING
42、-EXTENDED-VOIP-REPORT DEFINITIONS AUTOMATIC TAGS := BEGIN IMPORTS GenericIdentifier FROM H323-MESSAGES; ExtendedRTPMetrics := SEQUENCE networkPacketLossRate INTEGER (0255) OPTIONAL, jitterBufferDiscardRate INTEGER (0255) OPTIONAL, burstMetrics BurstMetrics OPTIONAL, rtcpRoundTripDelay INTEGER (06553
43、5) OPTIONAL, endSystemDelay INTEGER (065535) OPTIONAL, signalLevel INTEGER (-12710) OPTIONAL, noiseLevel INTEGER (-1270) OPTIONAL, residualEchoReturnLoss INTEGER (0127) OPTIONAL, rFactor INTEGER (0100) OPTIONAL, extRFactor INTEGER (0100) OPTIONAL, estimatedMOSLQ INTEGER (1050) OPTIONAL, estimatedMOS
44、CQ INTEGER (1050) OPTIONAL, plcType PLCtypes OPTIONAL, jitterBufferParms JitterBufferParms OPTIONAL, . BurstMetrics := SEQUENCE gmin INTEGER (0255) OPTIONAL, burstLossDensity INTEGER (0255) OPTIONAL, gapLossDensity INTEGER (0255) OPTIONAL, burstDuration INTEGER (065535) OPTIONAL, gapDuration INTEGER
45、 (065535) OPTIONAL, . PLCtypes := CHOICE unspecified NULL, disabled NULL, enhanced NULL, standard NULL, . JitterBufferParms := SEQUENCE jitterBufferType JitterBufferTypes OPTIONAL, jitterBufferAdaptRate INTEGER (015) OPTIONAL, jitterBufferNominalSize INTEGER (065535) OPTIONAL, jitterBufferMaxSize IN
46、TEGER (065535) OPTIONAL, jitterBufferAbsoluteMax INTEGER (065535) OPTIONAL, . JitterBufferTypes := CHOICE unknown NULL, reserved NULL, nonadaptive NULL, adaptive NULL, . qosMonitoringExtendedRTPMetrics GenericIdentifier := standard:2 END - of QOS-MONITORING-EXTENDED-VOIP-REPORT ITU-T Rec. H.460.9 (2
47、002)/Amd.1 (03/2004) 5 B.7 Linkage to H.460.9 data If present, an element of type ExtendedRTPMetrics shall be included together with identifier qosMonitoringExtendedRTPMetrics in element extensions of the RTCPMeasures structure, as defined in Annex A/H.460.9. Printed in Switzerland Geneva, 2004 SERI
48、ES OF ITU-T RECOMMENDATIONS Series A Organization of the work of ITU-T Series B Means of expression: definitions, symbols, classification Series C General telecommunication statistics Series D General tariff principles Series E Overall network operation, telephone service, service operation and huma
49、n factors Series F Non-telephone telecommunication services Series G Transmission systems and media, digital systems and networks Series H Audiovisual and multimedia systems Series I Integrated services digital network Series J Cable networks and transmission of television, sound programme and other multimedia signals Series K Protection against interference Series L Construction, installation and protection of cables and other elements of outside plant Series M TMN and network maintenance: international tra
