1、 ETSI TS 1Universal Mobile TelCore network Nb(3GPP TS 29.4TECHNICAL SPECIFICATION129 415 V13.2.0 (2017elecommunications System (Nb interface user plane protoc.415 version 13.2.0 Release 1317-01) (UMTS); tocols 13) ETSI ETSI TS 129 415 V13.2.0 (2017-01)13GPP TS 29.415 version 13.2.0 Release 13Referen
2、ce RTS/TSGC-0329415vd20 Keywords 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 de Grasse (06) N 7803/88 Important notice The prese
3、nt 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 modified without the prior written authorization of ETSI
4、. In case of any existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that th
5、e document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at https:/portal.etsi.org/TB/ETSIDeliverableStatus.aspx If you find errors in the present document, please send your comment to one of the following services: ht
6、tps:/portal.etsi.org/People/CommiteeSupportStaff.aspx Copyright Notification No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm except as authorized by written permission of ETSI. The content of the PDF version shall not
7、be modified without the written authorization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2017. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the b
8、enefit 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 GSM Association. ETSI ETSI TS 129 415 V13.2.0 (2017-01)23GPP TS 29.415 version 13.2.0 Rele
9、ase 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 for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Pr
10、operty 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 the ETSI IPR Policy, no investigation, including IPR s
11、earches, 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. Foreword This Technical Specification (TS) has been pro
12、duced 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 corresponding ETSI deliverables. The cross reference b
13、etween 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“, “will“, “will not“, “can“ and “cannot“ are to be interpreted as described in clause
14、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 TS 129 415 V13.2.0 (2017-01)33GPP TS 29.415 version 13.2.0 Release 13Contents Intellectual Property Rights 2g3Fore
15、word . 2g3Modal verbs terminology 2g3Foreword . 5g3Introduction 5g31 Scope 6g32 References 6g33 Definitions, symbols and abbreviations . 7g33.1 Definitions 7g33.2 Symbols 7g33.3 Abbreviations . 7g34 User Plane 7g34.1 General aspects . 7g34.2 Operational and Functional Aspects . 8g35 Transparent Mode
16、 8g36 Support mode for predefined SDU sizes 8g36.1 General . 8g36.2 Nb UP protocol layer services in Support Mode 8g36.3 Services expected from the Transport Network Layer . 8g36.4 Functions of the Nb UP protocol layer in Support Mode . 9g36.4.1 Functional model of the Nb UP protocol layer in Suppor
17、t Mode . 9g36.4.2 Frame handler function . 9g36.4.3 Procedure control functions 9g36.4.4 Non Access Stratum data streams specific functions 9g36.4.4.1 Frame quality classification 9g36.4.4.1.1 General 9g36.4.4.1.2 Handling of FQC information . 10g36.5 Elementary procedures . 10g36.5.1 Transfer of Us
18、er Data procedure . 10g36.5.1.1 Successful operation 10g36.5.1.2 Unsuccessful operation . 10g36.5.2 Initialisation procedure . 10g36.5.2.1 Successful operation 10g36.5.2.2 Unsuccessful operation . 11g36.5.3 Rate Control 11g36.5.3.1 Successful operation 11g36.5.3.1.1 Rate control for codecs other tha
19、n the EVS codec 11g36.5.3.1.2 Rate and mode control for the EVS codec . 11g36.5.3.1.3 Interworking of rate control between compatible AMR-WB and EVS codec configurations . 12g36.5.3.2 Unsuccessful operation . 12g36.5.4 Time Alignment 13g36.5.4.1 Successful operation 13g36.5.4.2 Unsuccessful operatio
20、n . 13g36.5.5 Handling of Error Event procedure . 13g36.5.5.1 Successful operation 13g36.5.5.2 Unsuccessful operation . 13g36.6 Elements for Nb UP communication in Support mode 13g36.7 Handling of unknown, unforeseen and erroneous protocol data 13g37 Communication Primitives for the Nb UP protocol l
21、ayer 13g37.1 Modelling Principle 13g3ETSI ETSI TS 129 415 V13.2.0 (2017-01)43GPP TS 29.415 version 13.2.0 Release 137.2 Primitives towards the upper layers at the CNL-SAP 13g37.3 Primitives towards the transport layers at TNL-SAP . 13g37.3.1 General 13g37.3.2 ATM/AAL2 based Transport Layer . 14g37.3
22、.2.1 General 14g37.3.2.2 AAL2 Service Primitives used by the Nb UP protocol . 14g37.3.3 GTP-U based Transport Layer 14g37.3.4 RTP/UDP/IP based Transport Layer. 14g38 Evolution of Nb UP Protocol . 14g3Annex A (informative): Change history . 15g3History 16g3ETSI ETSI TS 129 415 V13.2.0 (2017-01)53GPP
23、TS 29.415 version 13.2.0 Release 13Foreword This Technical Specification has 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 conte
24、nts 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 first digit: 1 presented to TSG for information; 2 presented to TSG for approval; 3 or greater indicates TSG approved doc
25、ument 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 have been incorporated in the document. Introduction The present document specifies the use
26、r plane protocol used between two Media Gateways in the CS core network. Through out the present document this protocol shall be referred to as the Nb UP protocol. The Nb UP protocol is for a large part identical to the Iu UP protocol (see 3GPP TS 25.415 2), and only the differences between the two
27、protocols are specified. This specification defines the applicability of the UP, as defined in 3GPP TS 25.415 2, for the Nb interface only. Given that the Nb UP uses the same PDU types as the Iu UP, the term IuFP is used to refer to the common framing. For the purpose of the present document, any oc
28、currence of the term “Iu UP“ in the corresponding sections of 3GPP TS 25.415 2, shall be interpreted as “Nb UP“. ETSI ETSI TS 129 415 V13.2.0 (2017-01)63GPP TS 29.415 version 13.2.0 Release 131 Scope The present document specifies the user plane protocol of the bearer used between two MGWs within th
29、e BICC-based CS core network, called the Nb UP protocol. The present document assumes the implementation of the split between call control and the bearer transport and control, as specified in 3GPP TS 23.205 1, see figure 1. Note that the present document does not preclude an implementation of a com
30、bined MSC Server and MGW. MGW Signalling and Data Transfer Interface Signalling Interface UTRAN GERAN Iu mode PSTN/ Legacy/External MSC server GMSC server Mc MGW Nb Nc Iu Iu Mc GERAN A/Gb mode A A Figure 1: CS core network logical architecture 2 References The following documents contain provisions
31、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, subsequent revisions do not apply. For a non-specific reference, t
32、he 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 3GPP TS 23.205: “Bearer Independent CS Core Network; Stage 2“ 2 3GPP T
33、S 25.415: “UTRAN Iu Interface User Plane Protocols“ 3 3GPP TS 29.232: “Media Gateway Controller; Media Gateway interface; Stage 3“ 4 3GPP TS 29.414: “Core Network Nb Data Transport and Transport Signalling“ 5 3GPP TR 41.001: “GSM Release specifications“ 6 3GPP TR 21.905: “Vocabulary for 3GPP Specifi
34、cations“ 7 IETF RFC 1889: “RTP A Transport Protocol for Real Time Applications“ 8 ITU-T I.366.1 (06/98): “Segmentation and Reassembly Service Specific Convergence Sublayer for the AAL type 2“ 9 3GPP TS 26.445:“Codec for Enhanced Voice Services (EVS); Detailed Algorithmic Description“. ETSI ETSI TS 1
35、29 415 V13.2.0 (2017-01)73GPP TS 29.415 version 13.2.0 Release 1310 3GPP TS 26.453: “Codec for Enhanced Voice Services (EVS); Speech codec frame structure“. 11 3GPP TS 26.454: “Codec for Enhanced Voice Services (EVS); Interface to Iu, Uu, Nb and Mb“. 3 Definitions, symbols and abbreviations 3.1 Defi
36、nitions Definitions used in the present document are listed in 3GPP TR 21.905 6. 3.2 Symbols For the purposes of the present document, the following symbols apply: Iu Interface between the RNS and the core network. It is also considered as a reference point. Nb Interface between media gateways. IuFP
37、 Iu Framing protocol 3.3 Abbreviations For the purposes of the present document, the following abbreviations apply: AAL ATM Adaptation Layer AAL2 AAL Type 2 ATM Asynchronous Transfer Mode CMR Codec Mode Request CN Core Network CNL Core Network Layer CS Circuit SwitchedEVS Enhanced Voice Services EVS
38、-CMR Codec Mode Request for EVS FFS For Further Study IPTI Inter PDU Transmission Interval Iu UP Iu interface User Plane MGW Media GateWay PDU Protocol Data Unit RTP Real-time Transmission Protocol SAP Service Access Point SDU Service Data Unit SRNC Serving Radio Network Controller 4 User Plane 4.1
39、General aspects The Nb UP is located in the user plane of the CS core network over the Nb interface. It is used to convey data between MGWs. The Nb UP protocol shall be initiated at one MGW and acknowledged by the adjoining MGW. The Nb UP framing is identical to the Iu UP framing, i.e., the same PDU
40、 types are valid for both protocols. Figure 2 shows the logical location of the Nb UP protocol layer in relation to the Nb interface. ETSI ETSI TS 129 415 V13.2.0 (2017-01)83GPP TS 29.415 version 13.2.0 Release 13MGWMGWNbIuTransport LayerSRNCRadio ProtocolsIu UP Iu UPNb UPNb UPFigure 2: Nb UP protoc
41、ol layer occurrence in overall architecture. 4.2 Operational and Functional Aspects There are two modes of operation for the Nb UP: - Transparent mode; - Support mode for predefined SDU size. The two modes of operation follow the definition of the corresponding Iu UP modes of operation, as described
42、 in 3GPP TS 25.415 2. Support mode version 2 is mandatory on the NbUP interface. Support mode version 1 is not required at the Nb but may be used if both MGWs support it, as a result of the version negotiation during the Initialisation procedure. 5 Transparent Mode This mode of operation is identica
43、l to that of the Iu UP protocol, see the corresponding section in 3GPP TS 25.415 2. 6 Support mode for predefined SDU sizes 6.1 General See the corresponding section in 3GPP TS 25.415 2. 6.2 Nb UP protocol layer services in Support Mode See the corresponding section in 3GPP TS 25.415 2. 6.3 Services
44、 expected from the Transport Network Layer See the corresponding section in 3GPP TS 25.415 2. ETSI ETSI TS 129 415 V13.2.0 (2017-01)93GPP TS 29.415 version 13.2.0 Release 136.4 Functions of the Nb UP protocol layer in Support Mode 6.4.1 Functional model of the Nb UP protocol layer in Support Mode Se
45、e the corresponding section in 3GPP TS 25.415 2. 6.4.2 Frame handler function See the corresponding section in 3GPP TS 25.415 2. 6.4.3 Procedure control functions See the corresponding section in 3GPP TS 25.415 2. 6.4.4 Non Access Stratum data streams specific functions See the corresponding section
46、 in 3GPP TS 25.415 2. 6.4.4.1 Frame quality classification 6.4.4.1.1 General On the Nb UP in Support Mode the frames are classified with the Frame Quality Classifier (FQC). This classifying is based on frame classification on the preceding link and the setting of the attribute “Delivery of erroneous
47、 SDUs“. The MSC server shall indicate the value of the attribute “Delivery of erroneous SDUs“ see 3GPP TS 29.232 3. Figure 4 shows the main input and output information for the frame quality classification function on the Nb UP. FQC, CRCNbInterf aceSDU, and new FQC =result of (old FQC;CRC)SDU, FQCMG
48、W MGWSupport modef unctionsSupport modef unctionsCNL-SA P CNL-SA PTNL-SAP TNL-SAPFigure 4: Frame quality classification in Nb UP ETSI ETSI TS 129 415 V13.2.0 (2017-01)103GPP TS 29.415 version 13.2.0 Release 136.4.4.1.2 Handling of FQC information The handling of FQC shall be as specified in Table 1.
49、 Table 1. FQC handling in Nb UP protocol, receiving side Input Action Delivery of erroneous SDUs FQC in received PDU Payload CRC yes or no good OK Leave FQC unchanged. Forward SDU and FQC to upper layer “yes“ “bad radio“ OK Leave FQC unchanged. Forward SDU and FQC to upper layer yes good or “badradio“ Not OK Set FQC to bad. Forward SDU and FQC to upper layer “yes“ “bad“ Any Leave FQC unchanged. Forward SDU and FQC to upper layer no good Not OK Drop SDU “no“ “bad“ or “badradio“ Any Not applicable. SDUs
