1、 ETSI TS 103 210 V1.2.1 (2014-05) Speech and multimedia Transmission Quality (STQ); End-to-End Jitter Transmission Planning Requirements for Real Time Services in an NGN context Technical Specification ETSI ETSI TS 103 210 V1.2.1 (2014-05)2Reference RTS/STQ-225 Keywords jitter buffer, QoS ETSI 650 R
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8、nefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 103 210 V1.2.1 (2014-05)3Contents Intellectual Property Rights 4g3Foreword . 4g3Introduction 4g31 Scope 5g32 References 5g32.1 Normative refere
9、nces . 5g32.2 Informative references 5g33 Definitions and abbreviations . 5g33.1 Definitions 5g33.2 Abbreviations . 6g34 Reference Configuration 7g34.1 Generic Segment-connection Points . 8g35 Guidance on Segment-connection limits 9g35.1 Guidance on Access Segment limits 9g35.2 Guidance on Total Tra
10、nsit Segment Limits 10g3History 11g3ETSI ETSI TS 103 210 V1.2.1 (2014-05)4Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members an
11、d non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/ipr.etsi.org).
12、Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present
13、 document. Foreword This Technical Specification (TS) has been produced by ETSI Technical Committee Speech and multimedia Transmission Quality (STQ). Introduction The present document provides end-to-end Jitter transmission requirements for voice, voice band data and conversational video services in
14、 a context of a IP Multimedia Core Network Subsystem. The focus is on details of jitter introduced by network elements, jitter caused by access bandwidth limitations and on reference connection scenarios. The objectives provided are a pre-requisite for network operators to be enabled to provide good
15、 quality connections as perceived by the user. The present document forms part of the STQ roadmap with respect to Quality aspects of IP Multimedia Subsystem. ETSI ETSI TS 103 210 V1.2.1 (2014-05)51 Scope The present document provides requirements on the jitter that need to be considered at the Segme
16、nt-connection of Voice over IP (VoIP) services, voice band data (VBD) services and conversational video service in an IP Multimedia Subsystem. The present document considers only the transport layer. 2 References References are either specific (identified by date of publication and/or edition number
17、 or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the reference document (including any amendments) applies. Referenced documents which are not found to be publicly available in the expected location might
18、 be found at http:/docbox.etsi.org/Reference. NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee their long term validity. 2.1 Normative references The following referenced documents are necessary for the application of the present documen
19、t. Not applicable. 2.2 Informative references The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject area. i.1 Recommendation ITU-T Y.1540 (2007): “Internet protocol data communication service - IP
20、 packet transfer and availability performance parameters“. i.2 Recommendation ITU-T Y.1541 (2006): “Network performance objectives for IP-based services“. i.3 Recommendation ITU-T Y.1542 (2006): “Framework for achieving end-to-end IP performance objectives“. i.4 GSMA IR.34-v9.1: “Guidelines for IPX
21、Provider networks“ (Previously Inter-Service Provider IP Backbone Guidelines). NOTE: Available at http:/ i.5 ETSI ES 282 001: “Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); NGN Functional Architecture“. 3 Definitions and abbreviations 3.1 Definiti
22、ons For the purposes of the present document, the following terms and definitions apply: access segment: network segment from the customer interface (UNI) to the interface on the customer side of the first Gateway Router ETSI ETSI TS 103 210 V1.2.1 (2014-05)6real time service: class of telecommunica
23、tions service requiring information to be transmitted and delivered within stated limits of time delay and jitter segment-connection point: point between two segments NOTE: The terms “interconnection“ or “interconnection point“ has been used in the NGN standards, e.g. in i.2, the same terms are gene
24、rally used for NNIs, not for the connection between access segment and transit segment, they might be misinterpreted. Therefore, throughout the present document, the terms “Segment-connection“ or “Segment-connection point“ are used. total transit segment: segment between Gateway routers, including t
25、he gateway routers themselves NOTE: The network segment may include interior routers with various roles. 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: DSLAM Digital Subscriber Line Access Manager ETH Ethernet GSMA GSM Association GW GateWay IAD Integr
26、ated Access Device I-BGF Interconnection Border Control Functions IMS IP Multimedia Subsystem IP Internet Protocol IPDV IP packet Delay Variation IPX IP Exchange ITU International Telecommunication Union ITU-T ITU Telecommunication Standardization Sector IWF Interworking Function MGW Media Gateway M
27、SAN Multi Service Access Node NGN Next Generation Network NNI Network to Network Interface PSTN Public Switched Telephone Network QoS Quality of Service RACS Resource and Admission Control Subsystem SBC Session Border Controller SIP Session Initiated Protocol SoIx Service-oriented Interconnection TE
28、 Terminal Equipment UNI User Network Interface UNIA User Network Interface A UNIC User Network Interface C VBD voice band data VoIP Voice over Internet Protocol xDSL x Digital Subscriber Line ETSI ETSI TS 103 210 V1.2.1 (2014-05)74 Reference Configuration Compared to networks and systems that are ci
29、rcuit-based, those based on IP pose distinctly different challenges for planning and achieving the end-to-end performance levels necessary to adequately support the wide array of user applications (voice, data, fax, video, etc.). The fundamental quality objectives for these applications are well und
30、erstood and have not changed as perceived by the user; what has changed is the technology (and associated impairments) in the layers below these applications. The very nature of IP-based routers and terminals, with their queuing methods and de-jitter buffers, respectively, makes realizing good end-t
31、o-end performance across multiple network operators a very major challenge for applications with stringent performance objectives. Fortunately Recommendations ITU-T Y.1540 i.1 and Y.1541 i.2 together provide the parameters needed to capture the performance of IP networks, and specify a set of “netwo
32、rk QoS“ classes with end-to-end objectives specified. It is widely accepted (i.e. beyond the ITU-T) that the network QoS classes of Recommendation ITU-T Y.1541 i.2 should be supported by Next Generation Networks, and thus by networks evolving into NGNs. Recommendation ITU-T Y.1542 i.3 considers vari
33、ous approaches toward achieving end-to-end (UNI-UNI) IP network performance objectives. The general reference configuration for the present document follows the principles shown in figure 1; the number of concatenated transit providers may vary. UNICPN CPNNNI NNITotal transit segmentUserSegment AAcc
34、essSegment AUserSegment CAccessSegment CNGNProvider ANGNProvider CNGN Provider BTransitSegmentA1TransitSegmentC1TransitSegmentB1UNIRegional MetroRegionalFigure 1: General Reference Configuration Thus the end-to-end connection can be decomposed into the User segment A: UNIA(sending side). Access segm
35、ent A. Segment-connection Point Ain. Total transit segment. Segment-connection Point Cout. Access segment C. UNIC(receiving side). User segment C. ETSI ETSI TS 103 210 V1.2.1 (2014-05)8The total transit segment can be further decomposed into: Transit segment A1. Segment-connection point Aout. Transi
36、t segment A2 (NNI). Segment-connection point Bin. Transit segment B1. Segment-connection point Bout. Transmit segment B2 (NNI). Segment-connection point Cin. Transit segment C1. 4.1 Generic Segment-connection Points Due to real-world constraints the simplified static divisor approach according to Re
37、commendation ITU-T Y.1542 i.3 has been chosen for the impairment apportionment between access and transit networks. This approach “divides“ the UNI-to-UNI path into three segments and budgets the impairments such that the total objective is met in principle. The delay values for the total transit se
38、gment are in a fixed relation to the distances between different geographical regions. Thus, for the near future dynamic allocation of delay budgets is not expected to be implemented between user segments, access segments and transit segments. In figure 2 the upper part displays the division of the
39、connection as seen from a QoS point of view whereas the lower part shows this division in terms of the NGN Functional Architecture ES 282 001 i.5. NOTE: The reference points Ic, Iw, and Iz are defined in Recommendation ITU-T Y.1541 i.2, clause 7.2.2. Service LayerTransport LayerUNI UNISBCSBC SBCSBCI
40、P TransitInterconnection ServerorTransit NetworkAccess Network Access NetworkNGN NGNUNI-UNICPN CPNQoS ViewNGN Functional Archutecture ViewRACSI-BGFService ControlSubsystemNon-compatibleControl domainCompatibleControl domainIWFSoIx interconnection reference modelIz/Ic Iz/IcIzIcIzIwFigure 2: Division
41、of the connection ETSI ETSI TS 103 210 V1.2.1 (2014-05)9Hence, there should be objectives for the following portions of the connection: UNI (send side) barb2leftbarb2right Segment-connection Point A. Segment-connection Point A barb2leftbarb2right Segment-connection Point C. Segment-connection Point
42、C barb2leftbarb2right UNI (receive side). As illustrated in figure 2, SoIx interconnection is typically characterized by the presence of two types of information exchanged between the two interconnected domains: Service-related signalling information, that allows to identify the end-to-end service t
43、hat has been requested. For example, in case of IMS-to-IMS SoIx interconnection, this is mapped to SIP signalling on the Ic reference point. Transport information, that carries the bearer traffic. The presence of the service-related signalling in SoIx interconnection enables the end-to-end service a
44、wareness. An NGN interconnection could be a SoIx even if the transport information is not exchanged between the interconnected domains, as long as service-related signalling is exchanged. An NGN transport layer interconnection is considered being part of an NGN SoIx interconnection if the transport
45、layer is controlled from the service layer in both of the interconnected domains. SoIx Interconnection interface includes at least Ic and Iz reference points between two interconnected domains that have same or compatible service control sub systems/domains. SoIx Interconnection interface with Inter
46、working includes at least the Iw and Iz reference points between two interconnected domains that have non- compatible service control sub systems/domains. 5 Guidance on Segment-connection limits QoS objectives in Recommendation ITU-T Y.1541 i.2 are deemed to be applicable when access link speeds are
47、 at the T1 or E1 rate and higher. Today many network providers use technologies where they offer access link speeds much smaller then T1or E1. Fortunately, de-jitter buffers in international MGW are often limited to a size of 100 ms, and it is suggested the total jitter should not be exceed 80 ms in
48、 order to leave some extra space for clock drift/skew. 5.1 Guidance on Access Segment limits The following IPDV limits can be applied for access networks (between TE and included SBC). See figure 3 for details. Table 1: Maximal IPDV values for xDSL and ETH Access Segment Nature of Network Applicatio
49、n Jitter Value Access Network (sending side) Voice 35 ms Conversational video 5 ms Access Network (receiving side) Voice 10 ms (see note 1) Conversational video 5 ms NOTE 1: 10 ms are recommended for Voice, the maximum IPDV value is 40 ms for Voice. NOTE 2: Conversational Video, minimal Service Rate 1 Mbps for 720 p Video-Quality. Table 2: Maximal IPDV values for MSAN Nature of Network Jitter value Access Network (sending side) 5 ms Acces
