1、 ETSI TR 126 937 V14.0.0 (2017-04) Universal Mobile Telecommunications System (UMTS); LTE; Transparent end-to-end Packet-switched Streaming Service (PSS); Real-time Transport Protocol (RTP) usage model (3GPP TR 26.937 version 14.0.0 Release 14) TECHNICAL REPORT ETSI ETSI TR 126 937 V14.0.0 (2017-04)
2、13GPP TR 26.937 version 14.0.0 Release 14Reference RTR/TSGS-0426937ve00 Keywords LTE,UMTS ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture
3、 de Grasse (06) N 7803/88 Important notice The present document can be downloaded from: http:/www.etsi.org/standards-search The present document may be made available in electronic versions and/or in print. The content of any electronic and/or print versions of the present document shall not be modi
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9、V14.0.0 (2017-04)23GPP TR 26.937 version 14.0.0 Release 14Intellectual 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 and non-members, a
10、nd 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 (https:/ipr.etsi.org/). Pursuant to th
11、e 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 document. For
12、eword This Technical Report (TR) has been produced by ETSI 3rd Generation Partnership Project (3GPP). The present document may refer to technical specifications or reports using their 3GPP identities, UMTS identities or GSM identities. These should be interpreted as being references to the correspon
13、ding ETSI deliverables. The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found under http:/webapp.etsi.org/key/queryform.asp. Modal verbs terminology In the present document “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “cannot“ are to be interpreted
14、as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TR 126 937 V14.0.0 (2017-04)33GPP TR 26.937 version 14.0.0 Release 14Contents Intellectual
15、Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g31 Scope 6g32 References 6g33 Definitions and abbreviations . 7g33.1 Definitions 7g33.2 Abbreviations . 7g34 Background and motivation . 8g35 Overview 8g36 End-to-end PSS system 8g36.1 Multimedia content creation . 9g36.1.1 CBR
16、 vs. VBR encoding for video . 9g36.2 Streaming server media transmission . 9g36.2.1 Transmission of VBR content over constant rate channels. 9g36.2.2 Transport and Transmission 10g36.2.3 Packet Sizes 10g36.2.4 Adaptation capability 12g36.2.5 Clarification of using PSS Video Buffering Verifier in a r
17、ate adaptive service environment 13g36.2.5.1 Clarification of terms and concepts . 13g36.2.5.2 Clarification of Annex G buffering parameters. 14g36.2.5.2.1 What is mandatory? . 15g36.2.5.2.2 Adaptive transmission curve-reception curve control . 15g36.2.5.2.3 Why is it important to have a strict conf
18、ormance point at the sampling curve-transmission curve control? 15g36.2.5.3 The resulting constraints and responsibilities . 15g36.2.5.4 Example scenario relying on 3GPP QoS guarantees . 15g36.2a Signalling for rate adaptation in Release 6 . 16g36.2a.1 Implementation of the signalling for rate adapt
19、ation 16g36.2a.2 Test results over EGPRS . 17g36.2a.2.1 Parameters used for the simulation . 17g36.2a.2.2 Results . 18g36.3 UMTS QoS profile parameters . 22g36.3.1 Guaranteed and maximum bitrate . 22g36.3.2 SDU error ratio . 22g36.3.3 Residual bit error rate . 23g36.3.4 Maximum SDU size 23g36.4 Bear
20、er and Layer 2 network protocols options . 23g36.4.1 UTRAN streaming bearer implementation options 23g36.4.1.1 UTRAN RLC modes . 23g36.4.1.2 Implications of RLC mode decision 24g36.4.1.3 Examples of bearers for PSS . 24g36.4.2 GERAN streaming bearer implementation options 24g36.4.2.1 Iu and A/Gb mod
21、es . 24g36.4.2.2 GERAN RLC modes . 24g36.5 Network transport channel mapping. 25g36.5.1 Dedicated or shared channel . 25g36.5.2 Implications of channel mapping decision 25g36.5.3 HSDPA . 26g36.5.4 EGPRS / GERAN . 26g36.6 Core network 26g3ETSI ETSI TR 126 937 V14.0.0 (2017-04)43GPP TR 26.937 version
22、14.0.0 Release 146.7 Streaming client 26g37 PSS characterisation . 26g37.1 Comparison of different rate control strategies for video streaming 26g37.2 Streaming application traffic characteristics 29g37.2.1 Packet size statistics 31g37.2.2 Packet Bitrate statistics . 33g37.3 UTRAN DCH with RLC Ackno
23、wledged Mode . 35g37.4 Use cases for QoS profile settings 37g37.4.1 Voice only AMR streaming QoS profile 38g37.4.2 High quality voice/low quality music AMR-WB streaming QoS profile . 38g37.4.3 Music only AAC streaming QoS profile. 39g37.4.4 Voice and video streaming QoS profile 39g37.4.5 Voice and v
24、ideo streaming QoS profile for GPRS Rel. 97 40g37.5 Robust handover management . 40g3Annex A: Characterisation metrics and testing guidelines 42g3Annex B: Change history 44g3History 45g3ETSI ETSI TR 126 937 V14.0.0 (2017-04)53GPP TR 26.937 version 14.0.0 Release 14Foreword This Technical Report has
25、been produced by the 3rdGeneration Partnership Project (3GPP). The contents of the present document are subject to continuing work within the TSG and may change following formal TSG approval. Should the TSG modify the contents of the present document, it will be re-released by the TSG with an identi
26、fying change of release date and an increase in version number as follows: Version x.y.z where: x the first digit: 1 presented to TSG for information; 2 presented to TSG for approval; 3 or greater indicates TSG approved document under change control. y the second digit is incremented for all changes
27、 of substance, i.e. technical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. ETSI ETSI TR 126 937 V14.0.0 (2017-04)63GPP TR 26.937 version 14.0.0 Release 141 Scope The objective of this document is to char
28、acterise the 3GPP Packet-switched Streaming Service (PSS). In doing so, the document considers the impacts of the underlying network configurations and how the streaming mechanism itself could be optimised. The scope of this document includes consideration of (non-exhaustive): Trade-off between radi
29、o usage efficiency and streaming QoS Feedback of network conditions and adaptation of stream and/or the transmission of the stream Optimal packetisation of the media stream in line with the segmentation within the transport mechanism Error robustness mechanisms (such as retransmission) Client buffer
30、ing to ease the QoS requirements on the network and enable more flexibility in how the network transport resources are applied. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. References are either specific
31、 (identified by date of publication, edition number, version number, etc.) or non-specific. For a specific reference, subsequent revisions do not apply. For a non-specific reference, the latest version applies. In the case of a reference to a 3GPP document (including a GSM document), a non-specific
32、reference implicitly refers to the latest version of that document in the same Release as the present document. 1 3GPP TR 41.001: “GSM Release specifications“. 2 3GPP TR 21.905: “Vocabulary for 3GPP Specifications“. 3 3GPP TS 26.234 (V5.0.0 onwards): “Transparent end-to-end packet switched streaming
33、 service (PSS); Protocols and codecs“. 4 3GPP TS 23.107: “QoS Concept and Architecture“. 5 IETF RFC 3550: “RTP: A Transport Protocol for Real-Time Applications“, Schulzrinne H. et al., July 2003. 6 3GPP TS 22.233: “Transparent end-to-end packet-switched streaming service. Service aspects (Stage 1)”
34、(Release 5) 7 3GPP TS 25.322: “RLC protocol specification” (Release 5). 8 V. Varsa, M. Karczewicz, Long Window Rate Control for Video Streaming, Proceedings of the 11thInternational Packet Video Workshop, 30 April 1 May, 2001, Kyungju, South Korea. 9 3GPP TS 34.108: “Common test environments for use
35、r equipment (UE). Conformance testing” (Release 99). 10 3GPP TS 34.108: “Common test environments for user equipment (UE). Conformance testing” (Release 4). 11 3GPP TS 25.323: “Packet data convergence protocol (PDCP) specification” (Release 5). 12 IETF RFC 3095: “Robust Header Compression (ROHC): fr
36、amework and four profiles: RTP, UDP, ESP and uncompressed”, C. Bormann (Ed.), July 2001. ETSI ETSI TR 126 937 V14.0.0 (2017-04)73GPP TR 26.937 version 14.0.0 Release 1413 3GPP TS 44.064: “Mobile Station Serving GPRS Support Node (MS-SGSN); Logical Link Control (LLC) layer specification” (Release 5).
37、 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given in 3G TR 21.905 2 and the following apply: network: in the context of the RTP usage model network refers to the UMTS bearer service between the entry-point of the UMTS network (
38、i.e. GGSN) and the UE. 3.2 Abbreviations For the purposes of the present document, the abbreviations given in 3GPP TR 21.905 2 and the following apply: 2G Second generation AM Acknowledged Mode AMC Adaptive Modulation and Coding AMR Adaptive Multi-Rate codec AMR-WB AMR WideBand ARQ Automatic Repeat
39、7ignall BLER Block Error Rate CBR Constant Bit Rate CBRP CBR Packet transmission CN Core Network CS Circuit SwitchedDCH Dedicated Channel DL DownLink DSCH Dedicated Shared Channel DSP Digital Signal ProcessingEDGE Enhanced Data rates for GSM Evolution EGPRS Enhanced GPRS GERAN GSM/EDGE RANGOB Group
40、Of Blocks GPRS General Packet Radio Service GSM Global System for Mobile communications GTP GPRS Tunneling Protocol H-ARQ Hybrid ARQ HRD Hypothetical Reference Decoder HSDPA High Speed Downlink Packet Access HTTP Hypertext Transfer Transport Protocol IP Internet Protocol IR Incremental Redundancy IS
41、DN Integrated Services Digital Network L2 Layer 2LAN Local Area Network LLC Logical Link Control LWRC Long Window Rate Control MCS Modulation and Coding Scheme MTU Maximum Transmission Unit PCU Packet Control Unit PDCP Packet Data Convergence Protocol PDP Packet Data Protocol PDTCH Packet Data Traff
42、ic Channel PDU Protocol Data Unit PS Packet SwitchedPSNR Peak Signal to Noise Ratio ETSI ETSI TR 126 937 V14.0.0 (2017-04)83GPP TR 26.937 version 14.0.0 Release 14PSS Packet-Switched streaming Service QCIF Quarter Common Interchange Format QoS Quality of Service QP Quantization Parameter RAB Radio A
43、ccess Bearer RAN Radio Access Network RLC Radio Link Control RNC Radio Network Controller ROHC Robust Header Compression RRM Radio Resource Management RTCP RTP Control Protocol RTP Real-time Transport Protocol SDP Session Description Protocol SDU Service Data Unit SMIL Synchronized Multimedia Integr
44、ation Language SNDCP Subnetwork Dependent Convergence Protocol SW SoftWare TCP Transmission Control Protocol TFRC TCP Friendly Rate Control TMN Test Model Near-term TTI Transmission Time Interval UDP User Datagram Protocol UE User Equipment UL UpLink UTRAN UMTS Terrestrial RAN VBR Variable Bit Rate
45、VBV Video Buffering Verifier VBRP VBR Packet transmission 4 Background and motivation The characterisation activity consists mainly of showing the expected PSS Release 5 performance in different use cases and network conditions and is expected to reveal any weaknesses and/or optimisation possibiliti
46、es. The PSS characterisation results should serve as problem definition and requirements, based on which algorithmic enhancements can be defined for possible inclusion in PSS Release 6. 5 Overview Void. 6 End-to-end PSS system When considering use cases for 3GPP PSS, an end-to-end system and protoco
47、l view is taken into consideration. For instance, the following issues are taken into account: 1. Multimedia content creation; 2. Streaming server media transmission and traffic characteristics; 3. UMTS QoS profile parameters and their implications; 4. Bearer and Layer 2 network protocol options (in
48、cluding PDCP and RLC); 5. Network transport channel mapping (dedicated or shared channels); 6. Core network; 7. Streaming client. ETSI ETSI TR 126 937 V14.0.0 (2017-04)93GPP TR 26.937 version 14.0.0 Release 14The PSS use cases assume the streaming server to be located in the mobile operators network
49、 or connected to the mobile network over the Gi interface where sufficient QoS is available (for example, through the use of over provisioning). The streaming client is located in the mobile User Equipment. Use cases are formed as a combination of QoS-relevant settings and parameters from the items 1-7 above. The PSS characterisation is meant to give insight into how different streaming server and streaming client algorithms and settings in PSS Release 5 perform in the given use cases. 6.1 Multimedia content creation 6.1.1 CB
