1、 ETSI TR 1Universal Mobile TelMultimedia BroadSelection and chaForward(3GPP TR 26.9floppy3TECHNICAL REPORT 126 947 V13.0.0 (2016elecommunications System (LTE; adcast/Multicast Service (MBMharacterisation of application rd Error Correction (FEC) .947 version 13.0.0 Release 1316-01) (UMTS); BMS); n la
2、yer 13) ETSI ETSI TR 126 947 V13.0.0 (2016-01)13GPP TR 26.947 version 13.0.0 Release 13Reference RTR/TSGS-0426947vd00 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
3、 but non lucratif enregistre la Sous-Prfecture 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 vers
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8、ECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GS
9、M Association. ETSI ETSI TR 126 947 V13.0.0 (2016-01)23GPP TR 26.947 version 13.0.0 Release 13Intellectual 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
10、 for ETSI members and 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 (h
11、ttps:/ipr.etsi.org/). 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, es
12、sential to the present document. Foreword 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
13、as being references to the corresponding 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 “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “wi
14、ll“, “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). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TR 126 947 V13.0.0 (2016-01)33GPP
15、 TR 26.947 version 13.0.0 Release 13Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 6g3Introduction 6g31 Scope 8g32 References 8g33 Definitions, symbols and abbreviations . 8g33.1 Definitions 8g33.2 Abbreviations . 9g34 Use of FEC in MBMS 9g34.1 Introduct
16、ion 9g34.2 Architecture 9g34.3 MBMS Bearer in UTRAN . 10g34.4 MBMS Bearer in E-UTRAN 11g34.5 Streaming Delivery User Service . 11g34.5.1 Introduction. 11g34.5.2 Transport in streaming delivery service 11g34.5.3 Examples 12g34.6 Download Delivery User Service . 12g34.6.1 Introduction. 12g34.6.2 Trans
17、port in download delivery service 13g34.6.3 Download Examples . 13g34.7 Streaming using DASH and Download Delivery User Service 14g35 MBMS Bearer Service Channel Modelling . 14g35.1 Introduction 14g35.2 Modelling of UTRAN MBMS Bearer 14g35.3 Modelling of E-UTRAN MBMS Bearer 14g36 FEC Evaluation Proc
18、edure . 18g36.1 Introduction 18g36.2 Simulation Conditions 18g36.2.1 Simulation conditions and assumptions (UTRAN). 18g36.2.2 Simulation conditions and assumptions (LTE eMBMS) 19g36.3 Code Performance 20g36.3.1 Introduction. 20g36.3.2 Method 1 . 20g36.3.2.1 Evaluation Procedure 20g36.3.2.2 Test Case
19、s . 21g36.3.2.3 Performance Metrics . 22g36.3.3 Method 2 . 23g36.3.3.1 Evaluation Procedure 23g36.3.3.2 Test Cases . 23g36.3.3.3 Performance Metrics . 23g36.4 Download Performance 24g36.4.1 Performance Metrics. 24g36.4.2 Download Performance over UTRAN 25g36.4.3 Download Performance over LTE 25g36.5
20、 UTRAN Streaming Performance . 28g36.6 Streaming Performance over LTE 28g36.6a Implementation-specific Performance Metrics. 31g36.7 Device-based Complexity Evaluation 31g3ETSI ETSI TR 126 947 V13.0.0 (2016-01)43GPP TR 26.947 version 13.0.0 Release 136.7.1 Introduction. 31g36.7.2 Test Cases . 31g36.7
21、.3 Test Conditions 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 incremented when editorial only changes
22、have been incorporated in the document. Introduction The on-going commercialization of LTE networks has precipitated increasing interest in the deployment of eMBMS. As the industry is considering the first deployments of eMBMS it is important to enhance the performance and usability of its core feat
23、ures. After development of the initial MBMS specifications, SA4 has focused its subsequent work on adding new features to the service. While application layer FEC usage in support of download and streaming delivery methods have been specified since Rel-6, those mechanisms have not been updated to re
24、flect performance improvement developments in more recent years. Examples of ongoing FEC enhancement efforts are the latest activities in IETF“s RMT and FECFRAME working groups. Such FEC improvements can also provide more efficient support of MBMS use cases. The objective of this TR is to document t
25、he progress of the work item to investigate and evaluate proposed FEC technologies and, if appropriate, adopt one which provides the most significant enhancement to the performance of the MBMS system over the Rel-6 application layer FEC in MBMS. Aspects of system performance, which would provide ben
26、efit to the system, include, but are not limited to Improving the bandwidth efficiency of streaming and download services delivery over MBMS Improving the reliability of streaming and download services delivery over MBMS, e.g. by increasing the amount of tolerable lost packets for a given FEC overhe
27、ad Reducing the required computational and memory resources for decoding in UEs Addressing backward compatibility issues by considering deployments of pre-Rel-11 MBMS FEC The evaluation and selection process for the proposed improvements is documented in this TR. This Technical report contains the f
28、ollowing attachments: Attachment-1-Tools.zip: This attachment contains relevant tools for the purpose of setting up the evaluation framework. Attachment-2-Benchmark-Codes.xls: This attachment contains all relevant results for the benchmark codes ETSI ETSI TR 126 947 V13.0.0 (2016-01)73GPP TR 26.947
29、version 13.0.0 Release 13 Attachment-3-Submission.zip: This attachment contains all submitted code overhead and device-evaluation results of the candidates Attachment-4-Verification.zip: This attachment contains all verification results for device-based evaluation. Attachment-5-6330.zip: This attach
30、ment contains the proposed application of 6330 as MBMS application layer FEC as provided by the proponent. Attachment-6-RS+LDPC.zip: This attachment contains the proposed application of RS+LDPC as MBMS application layer FEC as provided by the proponent. ETSI ETSI TR 126 947 V13.0.0 (2016-01)83GPP TR
31、 26.947 version 13.0.0 Release 131 Scope The present document documents the progress of the work item to investigate and evaluate proposed FEC technologies and adopt one which provides the most significant enhancement to the performance of the MBMS system over the Release 6 application layer FEC in
32、MBMS. 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. - For a specific reference,
33、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 as the present document. 1 3G
34、PP TR 21.905: “Vocabulary for 3GPP Specifications“. 2 3GPP TS 22.146: “Multimedia Broadcast/Multicast Service (MBMS); Stage 1“. 3 3GPP TS 26.346: “Multimedia Broadcast/Multicast Service (MBMS); Protocols and codecs“. 4 IETF RFC 3926 (October 2004): “FLUTE - File Delivery over Unidirectional Transpor
35、t“, T. Paila, M. Luby, R. Lehtonen, V. Roca and R. Walsh. 5 IETF RFC 5053 (February 2004): “Raptor Forward Error Correction Scheme for Object Delivery“, M. Luby, M.Watson, A. Shokrollahi, and T. Stockhammer. 6 IETF RFC 6363, “Forward Error Correction (FEC) Framework,“ M.Watson, A. Begen and V. Roca,
36、 October 2011. 7 3GPP TR 36.942, “Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Frequency (RF) system scenarios.“ 3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given in TR 21.905 1 and the following apply. A
37、term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905 1. Multimedia Broadcast/Multicast Service (MBMS): See 3GPP TS 22.146 2. MBMS user services: See 3GPP TS 22.146 2. MBMS delivery method: mechanism used by a MBMS user service to deliver co
38、ntent There are two MBMS delivery method instances: download and streaming. MBMS download delivery method: delivery of discrete objects (e.g. files) by means of a MBMS download session MBMS streaming delivery method: delivery of continuous media (e.g. real-time video) by means of a MBMS streaming se
39、ssion ETSI ETSI TR 126 947 V13.0.0 (2016-01)93GPP TR 26.947 version 13.0.0 Release 13MBMS download session: time, protocols and protocol state (i.e. parameters) which define sender and receiver configuration for the download of content files MBMS streaming session: time, protocols and protocol state
40、 (i.e. parameters) which define sender and receiver configuration for the streaming of content 3.2 Abbreviations For the purposes of the present document, the abbreviations given in TR 21.905 1 and the following apply. An abbreviation defined in the present document takes precedence over the definit
41、ion of the same abbreviation, if any, in TR 21.905 1. ALC Asynchronous Layered Coding BM-SC Broadcast-Multicast - Service Centre ESI Encoding Symbol IDFDT File Delivery Table FEC Forward Error Correction FLUTE File deLivery over Unidirectional Transport IP Internet Protocol LCT Layered Coding Transp
42、ort MBMS Multimedia Broadcast/Multicast Service PSS Packet Switch Streaming RTP Real-Time Transport Protocol SBN Source Block Number TOI Transport Object Identifier UDP User Datagram Protocol 4 Use of FEC in MBMS 4.1 Introduction Application Layer FEC is used in MBMS to compensate remaining losses o
43、n or below the IP layer in unidirectional delivery environments. 4.2 Architecture Figure 1 depicts the MBMS network architecture showing MBMS related entities involved in providing MBMS user services as specified in TS 26.346 3 with special focus to the FEC component. The FEC is included in the MBMS
44、 User Services which are part of the BM-SC on the network side and MBMS receiver on the UE side. FEC is specifically included in the File Delivery over Unidirectional Transport (FLUTE) 4 protocol and the Forward Error Correction (FEC) Framework (FECFRAME) 6 protocol. 3GPP TR 26.947 version 13.0.0 Re
45、lease 13Figure 1: O4.3 MBMS Bearer in UThe MBMS UTRAN Bearer service reuses mOnly minor modifications are introduced to suConvergence Protocol (PDCP) layer where foControl (RLC) the resulting PDCP-Protocol Dlength RLC-PDUs. The RLC layer operates innot available for point-to-multipoint bearers. reas
46、sembly, concatenation, padding, sequenceThe Medium Access Control (MAC) layer maBM-SC FLUTE FEC FECFRAFEMBMS Receiver FLUTE FEC FECFRAFEIP/UDP GERAN/UTRAN/EETSI ETSI TR 126 947103Overview on FEC operation in MBMS n UTRAN ost of the legacy UMTS protocol stack in the packet-swpport MBMS. The IP packet
47、s are processed in the Packf r example header compression might be applied. In thel Data Units (PDUs), generally of arbitrary length, are maunacknowledged mode as feedback links on the radio s Functions provided at the RLC layer are for example sece numbering, reordering and out-of-sequence and dupl
48、icps and multiplexes the RLC-PDUs to the transport chaME C Core NetwoRadio NetwGGSN/SGMBMS-GWGERAN UTRAN E-UTRANME EC -47 V13.0.0 (2016-01)switched domain. acket Data h Radio Link pped to fixed io access network are segmentation and lication detection. hannel and selects the rk ork SETSI ETSI TR 126
49、 947 V13.0.0 (2016-01)113GPP TR 26.947 version 13.0.0 Release 13transport format depending on the instantaneous source rate. The MAC layer and physical layer appropriately adapt the RLC-PDU to the expected transmission conditions by applying, among others, channel coding, power and resource assignment, and modulation. 4.4 MBMS Bearer in E-UTRAN The MBMS E-UTRAN Bearer service reuses most of the legacy LTE protocol stack in the packet-switched domain. Only minor modifications are introduced to support MBMS. The IP packets are
