1、 International Telecommunication Union ITU-T Q.3912TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (08/2012) SERIES Q: SWITCHING AND SIGNALLING Signalling requirements and protocols for the NGN Testing for next generation networks Set of parameters for monitoring next generation network streaming se
2、rvices Recommendation ITU-T Q.3912 ITU-T Q-SERIES RECOMMENDATIONS SWITCHING AND SIGNALLING SIGNALLING IN THE INTERNATIONAL MANUAL SERVICE Q.1Q.3 INTERNATIONAL AUTOMATIC AND SEMI-AUTOMATIC WORKING Q.4Q.59 FUNCTIONS AND INFORMATION FLOWS FOR SERVICES IN THE ISDN Q.60Q.99 CLAUSES APPLICABLE TO ITU-T ST
3、ANDARD SYSTEMS Q.100Q.119 SPECIFICATIONS OF SIGNALLING SYSTEMS No. 4, 5, 6, R1 AND R2 Q.120Q.499 DIGITAL EXCHANGES Q.500Q.599 INTERWORKING OF SIGNALLING SYSTEMS Q.600Q.699 SPECIFICATIONS OF SIGNALLING SYSTEM No. 7 Q.700Q.799 Q3 INTERFACE Q.800Q.849 DIGITAL SUBSCRIBER SIGNALLING SYSTEM No. 1 Q.850Q.9
4、99 PUBLIC LAND MOBILE NETWORK Q.1000Q.1099 INTERWORKING WITH SATELLITE MOBILE SYSTEMS Q.1100Q.1199 INTELLIGENT NETWORK Q.1200Q.1699 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR IMT-2000 Q.1700Q.1799 SPECIFICATIONS OF SIGNALLING RELATED TO BEARER INDEPENDENT CALL CONTROL (BICC) Q.1900Q.1999 BROADBAND IS
5、DN Q.2000Q.2999 SIGNALLING REQUIREMENTS AND PROTOCOLS FOR THE NGN Q.3000Q.3999 General Q.3000Q.3029 Network signalling and control functional architecture Q.3030Q.3099 Network data organization within the NGN Q.3100Q.3129 Bearer control signalling Q.3130Q.3179 Signalling and control requirements and
6、 protocols to support attachment in NGN environments Q.3200Q.3249 Resource control protocols Q.3300Q.3369 Service and session control protocols Q.3400Q.3499 Service and session control protocols supplementary services Q.3600Q.3649 NGN applications Q.3700Q.3849 Testing for next generation networks Q.
7、3900Q.3999For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T Q.3912 (08/2012) i Recommendation ITU-T Q.3912 Set of parameters for monitoring next generation network streaming services Summary Recommendation ITU-T Q.3912 provides the measurement metrics of stream servi
8、ce monitoring and defines a set of parameters that will impact the quality of streaming services in the next generation network (NGN). These parameters are generated by network elements, such as terminal elements, connection elements or transmission elements. The definitions provided here are depend
9、ent on NGN, which uses IP as the bearer protocol. This Recommendation defines the approach of measurement of NGN streaming services parameters. The procedures on how to monitor these parameters are out of the scope of this Recommendation. History Edition Recommendation Approval Study Group 1.0 ITU-T
10、 Q.3912 2012-08-13 11 Keywords Monitoring parameters, network performance, NGN, QoS, streaming services. ii Rec. ITU-T Q.3912 (08/2012) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication
11、technologies (ICTs). The ITU Telecommunication 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 T
12、elecommunication Standardization 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 som
13、e 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, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognize
14、d operating agency. Compliance 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
15、 “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 with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that t
16、he 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 applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation
17、 development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are
18、therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2013 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T Q.3912 (08/2012) iii Table of Contents Page 1 Sco
19、pe 1 2 References. 1 3 Definitions 2 3.1 Terms defined elsewhere 2 3.2 Terms defined in this Recommendation . 2 4 Abbreviations and acronyms 2 5 Conventions 3 6 Measurement metrics 3 6.1 Objective measurement 3 6.2 Subjective measurement . 3 7 Monitoring parameters 3 7.1 Physical level parameters .
20、3 7.2 Network level parameters . 4 7.3 Transport level parameters . 4 7.4 Service level parameters . 7 Bibliography. 10 Rec. ITU-T Q.3912 (08/2012) 1 Recommendation ITU-T Q.3912 Set of parameters for monitoring next generation network streaming services 1 Scope This Recommendation provides the measu
21、rement metrics of stream service monitoring and defines a set of parameters that will impact the quality of streaming services in the next generation network (NGN). These parameters are generated by network elements, such as terminal elements, connection elements or transmission elements. The defini
22、tions provided here are dependent on the NGN, which uses IP as the bearer protocol. This recommendation defines the approach of measurement of NGN streaming services parameters. The procedures on how to monitor these parameters are out of the scope of this Recommendation. 2 References The following
23、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 references are subject to revision; users of this Recommenda
24、tion 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 reference to a document within this Recommendation does not give
25、it, as a stand-alone document, the status of a Recommendation. ITU-T G.1050 Recommendation ITU-T G.1050 (2011), Network model for evaluating multimedia transmission performance over Internet Protocol. ITU-T G.1080 Recommendation ITU-T G.1080 (2008), Quality of experience requirements for IPTV servic
26、es. ITU-T H.222.0 Recommendation ITU-T H.222.0 (2006), Information technology Generic coding of moving pictures and associated audio information: Systems. ITU-T J.144 Recommendation ITU-T J.144 (2004), Objective perceptual video quality measurement techniques for digital cable television in the pres
27、ence of a full reference. ITU-T J.246 Recommendation ITU-T J.246 (2008), Perceptual visual quality measurement techniques for multimedia services over digital cable television networks in the presence of a reduced bandwidth reference. ITU-T J.247 Recommendation ITU-T J.247 (2008), Objective perceptu
28、al multimedia video quality measurement in the presence of a full reference. ITU-T J.341 Recommendation ITU-T J.341 (2011), Objective perceptual multimedia video quality measurement of HDTV for digital cable television in the presence of a full reference. ITU-T P.800 Recommendation ITU-T P.800 (1996
29、), Methods for subjective determination of transmission quality. ITU-T P.800.1 Recommendation ITU-T P.800.1 (2006), Mean Opinion Score (MOS) terminology. ITU-T P.862 Recommendation ITU-T P.862 (2001), Perceptual evaluation of speech quality (PESQ): An objective method for end-to-end speech quality a
30、ssessment of narrow-band telephone networks and speech codecs. 2 Rec. ITU-T Q.3912 (08/2012) ITU-T P.863 Recommendation ITU-T P.863 (2011), Perceptual objective listening quality assessment. ITU-T Q.3911 Recommendation ITU-T Q.3911 (2010), Parameters for monitoring voice services in NGN. ITU-R BT.50
31、0-13 Recommendation ITU-R BT.500-13 (2012), Methodology for the subjective assessment of the quality of television pictures. ITU-R BT.1359-1 Recommendation ITU-R BT.1359-1 (1998), Relative timing of sound and vision for broadcasting. 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses
32、 the following term defined elsewhere: 3.1.1 channel zapping ITU-T G.1080: The act of quickly changing from one channel to another. 3.2 Terms defined in this Recommendation None. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: 3G 3rd-Generation 4G 4th-
33、Generation BAT Bouquet Association Table CAT Conditional Access Table CRC Cyclic Redundancy Check DF Delay Factor EB Elementary Buffer EIT Event Information Table HD High-Definition IGMP Internet Group Management Protocol IP Internet Protocol ISMA Internet Streaming Media Alliance LTE Long Term Evol
34、ution MB Multiplex Buffer MDI Media Delivery Index MLR Media Loss Rate MOS Mean Opinion Score MPEG Moving Picture Experts Group NGN Next Generation Networks NIT Network Information Table Rec. ITU-T Q.3912 (08/2012) 3 PAT Program Association Table PCR Program Clock Reference PESQ Perceptual Evaluatio
35、n of Speech Quality PID Packet Identifier PMT Program Map Table POLQA Perceptual Objective Listening Quality Analysis PTS Presentation Time Stamp RST Running Status Table RTP Real-time Transport Protocol SI Service Information SDT Service Description Table TB Transport Buffer TDT Time and Date Table
36、 TOT Time Offset Table TS Transport Stream TSTD Transport Stream System Target Decoder 5 Conventions None. 6 Measurement metrics 6.1 Objective measurement Objective measurement is used to obtain the value of measurement parameters by injecting a test stream or input signals into the network. The tes
37、t stream or input signals are sent from one endpoint of the network, and received by the remote answering machine located at another endpoint. Objective measurements are based on criteria and metrics that can be measured objectively and be evaluated automatically. The analysis of the measurement par
38、ameters value can be used to determine the performance or behaviour of the system. 6.2 Subjective measurement Subjective measurement is used to evaluate the audio or video quality by some viewers. The audio or video sequences are shown to the group of viewers and then their opinions are recorded and
39、 averaged to evaluate the quality of each audio or video sequence. 7 Monitoring parameters 7.1 Physical level parameters 7.1.1 Network node equipment status Network node equipment status is defined as the physical status (e.g., Power On/Off) of the network node. The network node status in the monito
40、ring platform can show the real-time network status. 4 Rec. ITU-T Q.3912 (08/2012) 7.1.2 Terminal status Terminal status is defined as the physical status (e.g., Power On/Off) of the terminal. The terminal status in the monitoring platform can show the real-time terminal status. 7.1.3 Physical link
41、status Physical link status is defined as the status (e.g., Up/Down) of the link between network nodes or terminals (e.g., the link between two network nodes, or the link between a network node and a terminal). 7.1.4 Link effective bandwidth Link effective bandwidth is defined as the actual speed at
42、 which data can be transmitted as compared with the theoretical maximum speed that the specific link can transmit. 7.2 Network level parameters The performance of an IP network has an important impact on streaming services. Network level performance parameters such as packet loss, burst loss, sequen
43、tial packet loss, count of reordered packets, latency, jitter, peak jitter and peak-to-peak jitter defined in ITU-T G.1050 can reflect a networks performance and should be monitored. Media delivery index (MDI) which is defined in b-IETF RFC 4445 can be used as a diagnostic tool or a quality indicato
44、r for monitoring a network intended to deliver applications such as streaming media, MPEG video, voice over IP (VoIP), or other information which is sensitive to arrival time and packet loss. MDI provides a readily scalable per-stream measure focusing on loss and the cumulative effects of jitter. Th
45、e MDI consists of two components: the delay factor (DF) and the media loss rate (MLR). DF and MLR are defined in b-IETF RFC 4445. 7.3 Transport level parameters 7.3.1 MPEG-2 TS parameters If the multimedia stream is multiplexed by MPEG-2 transport stream (TS) as defined in ITU-T H.222.0, then the MP
46、EG-2 TS parameters in Table 7-1 should be monitored. The MPEG-2 TS parameters in Table 7-1 are defined in b-ETSI TR 101 290. Table 7-1 MPEG-2 TS monitoring parameters No. Parameters Definition First priority: necessary for de-codability (basic monitoring) 1.1 TS_sync_loss Loss of synchronization wit
47、h consideration of hysteresis parameters 1.2 Sync_byte_error Sync_byte not equal 0x47 1.3 PAT_error PID 0x0000 does not occur at least every 0.5 s A PID 0x0000 does not contain a table_id 0x00 (i.e., a PAT) Scrambling_control_field is not 00 for PID 0x0000 1.4 Continuity_count_error Incorrect packet
48、 order A packet occurs more than twice Lost packet Rec. ITU-T Q.3912 (08/2012) 5 Table 7-1 MPEG-2 TS monitoring parameters No. Parameters Definition 1.5 PMT_error Sections with table_id 0x02 (i.e., a PMT), do not occur at least every 0.5 s on the PID which is referred to in the PAT Scrambling_contro
49、l_field is not 00 for all PIDs containing sections with table_id 0x02 (i.e., a PMT) 1.6 PID_error Referenced PID does not occur for a user-specified period Second priority: recommended for continuous or periodic monitoring 2.1 Transport_error Transport_error_indicator in the TS-Header is set to “1“ 2.2 CRC_error CRC error occurred in CAT, PAT, PMT, NIT, EIT, BAT, SDT or TOT table 2.3 PCR_error PCR discontinuity of more than 100 ms occurring without specific indication. Time interval between two
