1、 ETSI TR 126 937 V15.0.0 (2018-07) 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 15.0.0 Release 15) TECHNICAL REPORT ETSI ETSI TR 126 937 V15.0.0 (2018-07)
2、13GPP TR 26.937 version 15.0.0 Release 15Reference RTR/TSGS-0426937vf00 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
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9、TR 126 937 V15.0.0 (2018-07)23GPP TR 26.937 version 15.0.0 Release 15Intellectual Property Rights Essential patents IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for
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14、 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 corresponding ETSI deliverables. The cross reference between GSM, UMTS, 3GPP and ETSI identities can be found
15、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 as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions)
16、. “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TR 126 937 V15.0.0 (2018-07)33GPP TR 26.937 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g31 Scope 6g32 References 6g3
17、3 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 vs. VBR encoding for video . 9g36.2 Streaming server media transmission . 9g36.2.1 Transmission of V
18、BR 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 rate adaptive service environment 12g36.2.5.1 Clarification of terms and concepts . 13g36.2.5.2 Clarif
19、ication 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 conformance point at the sampling curve-transmission curve control? 15g36.2.5.3 The resulting constraints
20、 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 adaptation 16g36.2a.2 Test results over EGPRS . 17g36.2a.2.1 Parameters used for the simulation . 17g36.2a
21、.2.2 Results . 17g36.3 UMTS QoS profile parameters . 22g36.3.1 Guaranteed and maximum bitrate . 22g36.3.2 SDU error ratio . 22g36.3.3 Residual bit error rate . 22g36.3.4 Maximum SDU size 23g36.4 Bearer and Layer 2 network protocols options . 23g36.4.1 UTRAN streaming bearer implementation options 23
22、g36.4.1.1 UTRAN RLC modes . 23g36.4.1.2 Implications of RLC mode decision 23g36.4.1.3 Examples of bearers for PSS . 24g36.4.2 GERAN streaming bearer implementation options 24g36.4.2.1 Iu and A/Gb modes . 24g36.4.2.2 GERAN RLC modes . 24g36.5 Network transport channel mapping. 24g36.5.1 Dedicated or
23、shared channel . 24g36.5.2 Implications of channel mapping decision 25g36.5.3 HSDPA . 25g36.5.4 EGPRS / GERAN . 25g36.6 Core network 26g36.7 Streaming client 26g3ETSI ETSI TR 126 937 V15.0.0 (2018-07)43GPP TR 26.937 version 15.0.0 Release 157 PSS characterisation . 26g37.1 Comparison of different ra
24、te control strategies for video streaming 26g37.2 Streaming application traffic characteristics 29g37.2.1 Packet size statistics 30g37.2.2 Packet Bitrate statistics . 32g37.3 UTRAN DCH with RLC Acknowledged Mode . 34g37.4 Use cases for QoS profile settings 36g37.4.1 Voice only AMR streaming QoS prof
25、ile 37g37.4.2 High quality voice/low quality music AMR-WB streaming QoS profile . 37g37.4.3 Music only AAC streaming QoS profile. 38g37.4.4 Voice and video streaming QoS profile 38g37.4.5 Voice and video streaming QoS profile for GPRS Rel. 97 39g37.5 Robust handover management . 39g3Annex A: Charact
26、erisation metrics and testing guidelines 41g3Annex B: Change history 43g3History 44g3ETSI ETSI TR 126 937 V15.0.0 (2018-07)53GPP TR 26.937 version 15.0.0 Release 15Foreword This Technical Report has been produced by the 3rdGeneration Partnership Project (3GPP). The contents of the present document a
27、re 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 identifying change of release date and an increase in version number as follows: Version x.y.z where: x the
28、 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 of substance, i.e. technical enhancements, corrections, updates, etc. z the third digit is increment
29、ed when editorial only changes have been incorporated in the document. ETSI ETSI TR 126 937 V15.0.0 (2018-07)63GPP TR 26.937 version 15.0.0 Release 151 Scope The objective of this document is to characterise the 3GPP Packet-switched Streaming Service (PSS). In doing so, the document considers the im
30、pacts 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 radio usage efficiency and streaming QoS - Feedback of network conditions and adaptation of stream and/
31、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 buffering to ease the QoS requirements on the network and enable more flexibility in how the networ
32、k 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 (identified by date of publication, edition number, version number, etc.) or non-specific.
33、 - 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 reference implicitly refers to the latest version of that document in the same Release
34、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 service (PSS); Protocols and codecs“. 4 3GPP TS 23.107: “QoS Concept and Architecture“
35、. 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)“ (Release 5) 7 3GPP TS 25.322: “RLC protocol specification“ (Release 5). 8 V. Varsa, M.
36、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 user equipment (UE). Conformance testing“ (Release 99). 10 3GPP TS 34.108: “Common test en
37、vironments 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): framework and four profiles: RTP, UDP, ESP and uncompressed“, C. Bormann (Ed.), July 2001
38、. ETSI ETSI TR 126 937 V15.0.0 (2018-07)73GPP TR 26.937 version 15.0.0 Release 1513 3GPP TS 44.064: “Mobile Station Serving GPRS Support Node (MS-SGSN); Logical Link Control (LLC) layer specification“ (Release 5). 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present docume
39、nt, 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 (i.e. GGSN) and the UE. 3.2 Abbreviations For the purposes of the present document, the
40、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 7ignall BLER Block Error Rate CBR Constant Bit Rate CBRP CBR Packet transmission CN Cor
41、e 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 Of Blocks GPRS General Packet Radio Service GSM Global System for Mobile communications
42、 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 ISDN Integrated Services Digital Network L2 Layer 2LAN Local Area Network LLC Logical Lin
43、k 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 Traffic Channel PDU Protocol Data Unit PS Packet SwitchedPSNR Peak Signal to Noise Ratio PSS
44、 Packet-Switched streaming Service QCIF Quarter Common Interchange Format QoS Quality of Service ETSI ETSI TR 126 937 V15.0.0 (2018-07)83GPP TR 26.937 version 15.0.0 Release 15QP Quantization Parameter RAB Radio Access Bearer RAN Radio Access Network RLC Radio Link Control RNC Radio Network Controll
45、er 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 Integration Language SNDCP Subnetwork Dependent Convergence Protocol SW SoftWare TCP Transmis
46、sion 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 VBV Video Buffering Verifier VBRP VBR Packet transmission 4 Background and motivation T
47、he 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 possibilities. The PSS characterisation results should serve as problem definition and requirement
48、s, 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 protocol view is taken into consideration. For instance, the following issues are taken into a
49、ccount: 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 (including PDCP and RLC); 5) Network transport channel mapping (dedicated or shared channels); 6) Core network; 7) Streaming client. The PSS use cases assume the streaming server to be located in the mobile operators network or connected to the mobile network over the Gi interface where sufficient QoS is available (for example, throug
