1、 ETSI TS 138 474 V15.1.0 (2018-07) 5G; NG-RAN; F1 data transport (3GPP TS 38.474 version 15.1.0 Release 15) TECHNICAL SPECIFICATION ETSI ETSI TS 138 474 V15.1.0 (2018-07)13GPP TS 38.474 version 15.1.0 Release 15Reference DTS/TSGR-0338474vf10 Keywords 5G ETSI 650 Route des Lucioles F-06921 Sophia Ant
2、ipolis 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 present document can be downloaded from: http:/www.etsi.org/standards-search The present
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5、t 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: https:/portal.etsi.org/People/CommiteeSupportStaff.aspx Copyright Notification No part
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7、ng restriction extend to reproduction in all media. ETSI 2018. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are trademarks of ETSI registered for the benefit of its Members. 3GPPTM and LTETMare trademarks of ETSI registered for the benefit of its Members and of the 3GPP Organiza
8、tional Partners. oneM2M logo is protected for the benefit of its Members. GSMand the GSM logo are trademarks registered and owned by the GSM Association. ETSI ETSI TS 138 474 V15.1.0 (2018-07)23GPP TS 38.474 version 15.1.0 Release 15Intellectual Property Rights Essential patents IPRs essential or po
9、tentially essential to normative deliverables 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 Property Rights (IPRs); Essential, or potentially Essen
10、tial, 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 searches, has been carried out by ETSI. No guarantee c
11、an 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. Trademarks The present document may include trademarks and/or tradenames which are asserted and/or registere
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13、services or organizations associated with those trademarks. Foreword This Technical Specification (TS) 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 identi
14、ties. 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 under http:/webapp.etsi.org/key/queryform.asp. Modal verbs terminology In the present document “shall“, “shall not“, “should“, “s
15、hould 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). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI
16、 TS 138 474 V15.1.0 (2018-07)33GPP TS 38.474 version 15.1.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 Definitions and abbreviations . 5g33.1 Definitions 5g33.2 Abbreviations . 6g34 Data Link Layer . 6g35 F1
17、Interface user plane protocol . 6g35.1 General . 6g35.2 GTP-U 6g35.3 UDP/IP . 6g35.4 Diffserv code point marking . 7g3Annex A (informative): Change history . 8g3History 9g3ETSI ETSI TS 138 474 V15.1.0 (2018-07)43GPP TS 38.474 version 15.1.0 Release 15Foreword This Technical Specification has been pr
18、oduced 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 identifying c
19、hange 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 of sub
20、stance, 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 TS 138 474 V15.1.0 (2018-07)53GPP TS 38.474 version 15.1.0 Release 151 Scope The present document specifies the standards for
21、 user data transport protocols and related signalling protocols to establish user plane transport bearers over the F1 interface. The F1 interface provides means for interconnecting a gNB-CU and a gNB-DU of a gNB within an NG-RAN, or for interconnection a gNB-CU and a gNB-DU of an en-gNB within an E-
22、UTRAN. 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,
23、 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 3
24、GPP TR 21.905: “Vocabulary for 3GPP Specifications“. 2 3GPP TS 29.281: “General Packet Radio System (GPRS) Tunnelling Protocol User Plane (GTPv1-U)“. 3 IETF RFC 768 (1980-08): “User Datagram Protocol“. 4 IETF RFC 2474 (1998-12): “Definition of the Differentiated Services Field (DS Field) in the Ipv4
25、 and Ipv6 Headers“. 5 IETF RFC 2460 (1998-12): “Internet Protocol, Version 6 (Ipv6) Specification“. 6 IETF RFC 791 (1981-09): “Internet Protocol“. 7 3GPP TS 38.300: “NR; Overall description; Stage-2“. 8 3GPP TS 38.401: “NG-RAN; Architecture Description“. 9 3GPP TS 37.340: “NR; Multi-connectivity; Ov
26、erall description; Stage-2“. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the terms and definitions given in 3GPP TR 21.905 1 and the following apply. A term defined in the present document takes precedence over the definition of the same term, if any, in
27、 3GPP TR 21.905 1. en-gNB: as defined in TS 37.340 9. F1: interface between a gNB-DU and a gNB-CU, providing an interconnection point between the gNB-DU and the gNB-CU. gNB-CU: as defined in TS 38.401 8. gNB-DU: as defined in TS 38.401 8. gNB: as defined in TS 38.300 7. ETSI ETSI TS 138 474 V15.1.0
28、(2018-07)63GPP TS 38.474 version 15.1.0 Release 153.2 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 definition of the same abbreviation, if any, in TR 2
29、1.905 1. GTP GPRS Tunnelling Protocol IP Internet Protocol TEID Tunnel Endpoint Identifier UDP User Datagram Protocol 4 Data Link Layer Any data link protocol that fulfils the requirements toward the upper layer may be used. 5 F1 Interface user plane protocol 5.1 General The transport layer for data
30、 streams over F1 is an IP based Transport. The following figure shows the transport protocol stacks over F1. GTP-U UDP IPv6 (RFC 2460) and/or IPv4 (RFC 791) Data link layer Physical layer Figure 5.1: Transport network layer for data streams over F1 The GTP-U (TS 29.281 2) protocol over UDP over IP s
31、hall be supported as the transport for data streams on the F1 interface. The data link layer is as specified in clause 4. The transport bearer is identified by the GTP-U TEID (TS 29.281 2) and the IP address (source TEID, destination TEID, source IP address, destination IP address). 5.2 GTP-U The GT
32、P-U (TS 29.281 2) protocol shall be used over the F1 interface between gNB-DU and gNB-CU. 5.3 UDP/IP The path protocol used shall be UDP (IETF RFC 768 3). The UDP port number for GTP-U shall be as defined in TS 29.281 2. The gNB-DU and the gNB-CU shall support fragmentation and assembly of GTP packe
33、ts at the IP layer. The gNB-DU and the gNB-CU shall support Ipv6 (IETF RFC 2460 5) and/or Ipv4 (IETF RFC 791 6). There may be one or several IP addresses in the gNB-DU and in the gNB-CU. The packet processing function in the gNB-CU shall send downstream packets of a given bearer to the gNB-DU IP add
34、ress (received in F1AP) associated to ETSI ETSI TS 138 474 V15.1.0 (2018-07)73GPP TS 38.474 version 15.1.0 Release 15that particular bearer. The packet processing function in the gNB-DU shall send upstream packets of a given bearer to the gNB-CU IP address (received in F1AP) associated to that parti
35、cular bearer. The Transport Layer Address signalled in F1AP messages is a bit string of: a) 32 bits in case of Ipv4 address according to IETF RFC 791 6; or b) 128 bits in case of Ipv6 address according to IETF RFC 2460 5; or c) 160 bits if both Ipv4 and Ipv6 addresses are signalled, in which case th
36、e Ipv4 address is contained in the first 32 bits. 5.4 Diffserv code point marking IP Differentiated Services code point marking (IETF RFC 2474 4) shall be supported. The mapping between traffic categories and Diffserv code points shall be configurable by O&M based on 5G QoS Class Identifier (5CI) Ch
37、aracteristics and other NG-RAN traffic parameters. Traffic categories are implementation-specific and may be determined from the application parameters. ETSI ETSI TS 138 474 V15.1.0 (2018-07)83GPP TS 38.474 version 15.1.0 Release 15Annex A (informative): Change history Change history Date Meeting Td
38、oc CR Rev Cat Subject/Comment New version 2017-6 RAN3 NR ad hoc The first version, includes technical content endorsed in previous meetings 0.1.0 2017-9 RAN3#97bis R3-173796 Rapporteurs update, minor correction 0.2.0 2017-10 RAN3#97bis R3-174248 TS 38.474 v0.3.0 covering agreements of RAN3 #97bis 0.
39、3.0 2017-12 RAN3#98 R3-175075 Baseline pCR to TS 38.474 covering agreements of RAN3#98 0.4.0 2017-12 RAN#78 RP-172671 First submission to RAN for approval 1.0.0 2018-01 RP-78 TS approved by RAN plenary 15.0.0 2018-06 RP-80 RP-181238 0002 F Rapporteurs correction to TS 38.474 15.1.0 ETSI ETSI TS 138 474 V15.1.0 (2018-07)93GPP TS 38.474 version 15.1.0 Release 15History Document history V15.1.0 July 2018 Publication
