1、 International Telecommunication Union ITU-T H.248.30TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (01/2007) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMSInfrastructure of audiovisual services Communication procedures Gateway control protocol: RTCP extended performance metrics packages ITU-T Recomm
2、endation H.248.30 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 Transmission multiplexing and synchronization H.220H.229 Systems aspects H.230H.239 Communication proce
3、dures 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 multimedia services H.350H.359 Quality of service architecture for audiovisual and multimedia s
4、ervices 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 H-Series multimedia systems and services H.510H.519 Mobile multimedia collaboration applicat
5、ions 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.550H.559Mobile multimedia collaboration inter-working procedures H.560H.569 BROADBAND AND T
6、RIPLE-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 Recommendation H.248.30 Gateway control protocol: RTCP extended performance metrics packages Summary This Recommendation defines a package t
7、hat provides RFC 3611s RTP Control Protocol Reporting Extensions (RTCP XR) metrics reporting capabilities for ITU-T Rec. H.248 that provide more detailed insight into call quality and causes of degradation than basic RTCP statistics. Edition 2 adds a new package and modifies the existing package to
8、allow the support of reporting RTCP XR statistics from both directions of a bidirectional RTP session controlled through RTCP. Source ITU-T Recommendation H.248.30 was approved on 13 January 2007 by ITU-T Study Group 16 (2005-2008) under the ITU-T Recommendation A.8 procedure. ITU-T Rec. H.248.30 (0
9、1/2007) i FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff ques
10、tions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommendation
11、s 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 technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendation,
12、the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure e.g. interoperability or ap
13、plicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that compliance wit
14、h the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or appli
15、cability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had received notice of intellectual property, protected by patents, which may be required to implement
16、 this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2007 All rights reserved. No part of this publication may be reproduced, by any means
17、whatsoever, without the prior written permission of ITU. ii ITU-T Rec. H.248.30 (01/2007) CONTENTS Page 1 Scope 1 2 References. 1 3 Definitions 1 4 Abbreviations 1 5 RTCP XR Base Package. 2 5.1 Properties 2 5.2 Events . 2 5.3 Signals 2 5.4 Statistics 2 5.5 Procedures 5 6 RTCP XR Burst Metrics Packag
18、e. 5 6.1 Properties 5 6.2 Events . 5 6.3 Signals 6 6.4 Statistics 6 6.5 Procedures 7 7 Received RTCP XR Package 7 7.1 Properties 7 7.2 Events . 8 7.3 Signals 8 7.4 Statistics 8 7.5 Procedures 10 8 Received RTCP XR Burst Metrics Package. 10 8.1 Properties 11 8.2 Events . 11 8.3 Signals 11 8.4 Statist
19、ics 11 8.5 Procedures 12 ITU-T Rec. H.248.30 (01/2007) iii ITU-T Recommendation H.248.30 Gateway control protocol: RTCP extended performance metrics packages 1 Scope This Recommendation describes a set of Extended Performance Metrics for Voice over IP QoS reporting that provide more detailed insight
20、 into call quality and causes of degradation than basic RTCP statistics. The metrics described in this Recommendation are consistent with those described in the RTCP XR Voice over IP Metrics Payload described in IETF RFC 3611. This edition 2 adds the capability to report this information bidirection
21、ally. This enhancement allows for detailed insight over the entire topology of the stream in question, rather than just the outbound direction from the point of view of the termination. 2 References The following ITU-T Recommendations and other references contain provisions which, through reference
22、in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recen
23、t edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. The reference to a document within this Recommendation does not give it, as a stand-alone document, the status of a Recommendation. ITU-T Recommendation G.1
24、07 (2005), The E-Model, a computational model for use in transmission planning. ITU-T Recommendation G.108 (1999), Application of the E-model: A planning guide. ITU-T Recommendation H.248.1 (2005), Gateway control protocol: Version 3. IETF RFC 3611 (2003), RTP Control Protocol Extended Reports (RTCP
25、 XR). 3 Definitions This Recommendation defines the following terms: 3.1 burst: A period during which a high proportion of packets are either lost or discarded due to late arrival. 3.2 gap: A period of low packet losses and/or discards. 4 Abbreviations This Recommendation uses the following abbrevia
26、tions: MG Media Gateway MGC Media Gateway Controller MOSCQ Mean Opinion Score for Conversational Quality MOSLQ Mean Opinion Score for Listening Quality RTCP RTP Control Protocol RTCP XR RTCP Extended Reports RTP Real-time Transfer Protocol ITU-T Rec. H.248.30 (01/2007) 1 5 RTCP XR Base Package Packa
27、ge Name: RTCP XR Base Package PackageID: rtcpxr (0x0080) Description: This package defines properties and statistics to report extended quality of service metrics generated on the near-end termination for transmission toward the far end of the RTCP session. Version: 1 Extends: rtp version 1 5.1 Prop
28、erties 5.1.1 Packet Loss Concealment Type Property Name: Packet Loss Concealment Type PropertyID: plc (0x0001) Description: The type of packet loss concealment algorithm in use. Type: Enumeration Possible Values: U (0x0001) Unspecified D (0x0002) Disabled Silence insertion is being used. S (0x0003)
29、Standard. E (0x0004) Enhanced. Default: U Defined in: LocalControl Descriptor Characteristics: Read/Write 5.2 Events None 5.3 Signals None 5.4 Statistics 5.4.1 Network Packet Loss Rate Statistic Name: Network Packet Loss Rate StatisticID: nplr (0x0009) Description: The proportion of packets lost sin
30、ce 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 total number of packets expected and multiplying this value by 256 and taking the integer part. Thus a value of 0 would correspond to a packet loss rate
31、of zero and a value of 64 would correspond to a packet loss rate of 0.25 (corresponding to 25 per cent). Type: Integer Possible values: Any value greater than or equal to 0 2 ITU-T Rec. H.248.30 (01/2007) 5.4.2 Jitter Buffer Discard Rate Statistic Name: Jitter Buffer Discard Rate StatisticID: jdr (0
32、x000a) Description: 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 taking the i
33、nteger part. Type: Integer Possible values: Any value greater than or equal to 0 Level: Either 5.4.3 RTCP Round-Trip Delay Statistic Name: RTCP Round-Trip Delay StatisticID: rtd (0x000b) Description: The round-trip delay between the RTP interfaces on the local and remote MGs. Type: Integer Possible
34、values: Any value greater than or equal to 0 in milliseconds Level: Either 5.4.4 End System Delay Statistic Name: End System Delay StatisticID: esd (0x000c) Description: The end system delay, comprising encode, decode and jitter buffer delay. This may be combined with the RTCP Round-Trip Delay to es
35、timate the overall Voice over IP segment round-trip delay. Type: Integer Possible values: Any value greater than or equal to 0 in milliseconds Level: Either 5.4.5 Signal Level Statistic Name: Signal Level StatisticID: sl (0x000d) Description: The ratio of the signal level to a 0 dBm0 reference. Type
36、: Integer Possible values: Any value in dB Level: Either 5.4.6 Noise Level Statistic Name: Noise Level StatisticID: nl (0x000e) Description: The ratio of the silent period background noise level to a 0 dBm0 reference. ITU-T Rec. H.248.30 (01/2007) 3 Type: Integer Possible values: Any value less than
37、 or equal to 0 in dB Level: Either 5.4.7 Residual Echo Return Loss Statistic Name: Residual Echo Return Loss StatisticID: rerl (0x000f) Description: The echo return loss after the effects of echo cancellation. Type: Integer Possible values: Any value greater than or equal to 0 in dB. Level: Either 5
38、.4.8 R Factor Statistic Name: R Factor StatisticID: ns (0x0010) Description: A value representing the receiving end call quality of the RTP stream terminated by this termination, calculated per ITU-T Rec. G.107. Table 1/G.108 provides interpretive information about the value of the R factor. Type: I
39、nteger Possible values: Any value between 0 and 100 Level: Either 5.4.9 External R Factor Statistic Name: External R Factor StatisticID: xns (0x0011) Description: A value representing the effects of any call segment carried over a network segment external to the RTP stream terminated by this termina
40、tion, calculated per ITU-T Rec. G.107. Table 1/G.108 provides interpretive information about the value of the R factor. Type: Integer Possible values: Any value between 0 and 100 Level: Either 5.4.10 Estimated MOSLQ Statistic Name: Estimated MOSLQ StatisticID: lq (0x0012) Description: An estimated r
41、eceiving end Listening Quality MOS, calculated per ITU-T Rec. G.107 and multiplied by 10 as described in IETF RFC 3611. Type: Integer Possible values: Any value between 10 to 50 Level: Either 4 ITU-T Rec. H.248.30 (01/2007) 5.4.11 Estimated MOSCQ Statistic Name: Estimated MOSCQ StatisticID: cq (0x00
42、13) Description: An estimated receiving end Conversational Quality MOS, calculated per ITU-T Rec. G.107 and multiplied by 10 as described by IETF RFC 3611. Type: Integer Possible values: Any value between 10 and 50 Level: Either 5.5 Procedures None 6 RTCP XR Burst Metrics Package Package Name: RTCP
43、XR Burst Metrics Package PackageID: xrbm (0x0081) Description: This package defines properties and statistics for reporting burst metrics generated on the near-end termination for transmission toward the far end of the RTCP session. Version: 1 Extends: rtcpxr version 1 6.1 Properties 6.1.1 Minimum G
44、ap Threshold Property Name: Minimum Gap Threshold PropertyID: gmin (0x0002) Description: A parameter used to define bursts. This is by default set to 16, which sets the threshold packet loss rate between bursts and gaps to approximately 6%. See the procedures for how to use Gmin to determine a burst
45、. Gmin shall not be altered once the RTP stream is established. Attempts to do so should result in the MG returning error xxx. Type: Integer Possible values: Any positive integral value Default: 16 Defined in: LocalControl Descriptor Characteristics: Read/Write 6.2 Events None 6.3 Signals None ITU-T
46、 Rec. H.248.30 (01/2007) 5 6.4 Statistics 6.4.1 Burst Loss Density Statistic Name: Burst Loss Density StatisticID: bld (0x0014) Description: 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 t
47、he number of packets lost in the transmission path and discarded by the jitter buffer during 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
48、 lost in transit or discarded due to late arrival. In general, a burst is likely to result in audible degradation to call quality. Type: Integer Possible values: Any integral value greater than or equal to 0 Level: Either 6.4.2 Burst Duration Statistic Name: Burst Duration StatisticID: bd (0x0015) D
49、escription: The average length of burst periods. Type: Integer Possible values: Any integral number of milliseconds greater than or equal to 0 Level: Either 6.4.3 Gap Loss Density Statistic Name: Gap Loss Density StatisticID: gld (0x0016) Description: 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 during gap pe
