ETSI TS 138 424-2018 5G NG-RAN Xn data transport (V15 0 0 3GPP TS 38 424 version 15 0 0 Release 15).pdf

1、 ETSI TS 138 424 V15.0.0 (2018-07) 5G; NG-RAN; Xn data transport (3GPP TS 38.424 version 15.0.0 Release 15) TECHNICAL SPECIFICATION ETSI ETSI TS 138 424 V15.0.0 (2018-07)13GPP TS 38.424 version 15.0.0 Release 15Reference RTS/TSGR-0338424vf00 Keywords 5G ETSI 650 Route des Lucioles F-06921 Sophia Ant

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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 138 424 V15.0.0 (2018-07)23GPP TS 38.424 version 15.0.0 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

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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 138 424 V15.0.0 (2018-07)33GPP TS 38.424 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 Definitions and abbreviations . 5g33.1 Definitions 5g33.2 Abbreviations . 5g34 Data link layer 5g35 Xn in

17、terface user plane protocol 6g35.1 General . 6g35.2 GTP-U 6g35.3 UDP/IP . 6g35.4 DiffServ code point marking 6g3Annex A (informative): Change history . 8g3History 9g3ETSI ETSI TS 138 424 V15.0.0 (2018-07)43GPP TS 38.424 version 15.0.0 Release 15Foreword This Technical Specification has been produced

18、 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 change

19、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 substance

20、, 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 138 424 V15.0.0 (2018-07)53GPP TS 38.424 version 15.0.0 Release 151 Scope The present document specifies the standards for user

21、data transport protocols and related signalling protocols to establish user plane transport bearers over the Xn interface. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. - References are either specific (i

22、dentified 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

23、 reference implicitly refers to the latest version of that document in the same Release as the present document. 1 3GPP 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 Da

24、tagram Protocol“. 4 IETF RFC 2474 (1998-12): “Definition of the Differentiated Services Field (DS Field) in the Ipv4 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 Descrip

25、tion; Stage 2“. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions below apply. Terms and definitions not defined below can be found in TR 21.905 1. NG-RAN node: as defined in TS 38.300 7. 3.2 Abbreviations For the purposes o

26、f the present document, the abbreviations given in 3GPP 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 3GPP TR 21.905 1. GTP GPRS Tunnelling Protocol IP Internet Protocol PDCP Packet Data

27、Convergence Protocol PDU Protocol Data Unit 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. ETSI ETSI TS 138 424 V15.0.0 (2018-07)63GPP TS 38.424 version 15.0.0 Release 155 Xn interf

28、ace user plane protocol 5.1 General The transport layer for data streams over Xn is an IP based Transport. The following figure shows the transport protocol stacks over Xn. GTP-U UDP IPv6 (RFC 2460) and/or IPv4 (RFC 791) Data link layer Physical layer Figure 5.1: Transport network layer for data str

29、eams over Xn The GTP-U (TS 29.281 2) protocol over UDP over IP shall be supported as the transport for data streams on the Xn interface. The data link layer is as specified in clause 4. The transport bearer is identified by the GTP-U TEID (TS 29.281 3) and the IP address (source TEID, destination TE

30、ID, source IP address, destination IP address). 5.2 GTP-U The GTP-U (TS 29.281 2) protocol shall be used over the Xn interface between two NG-RAN nodes. 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 NG-RAN nodes

31、 over the Xn interface shall support fragmentation and assembly of GTP packets at the IP layer. The NG-RAN nodes shall support IPv6 (IETF RFC 2460 5) and/or IPv4 (IETF RFC 791 6). There may be one or several IP addresses in both NG-RAN nodes. The packet processing function in the source NG-RAN node

32、shall send downstream packets of a given flow to the target NG-RAN node. IP address (received in XnAP) associated to the DL transport bearer of that particular flow. The packet processing function in the source NG-RAN node shall send upstream packets of a given flow to the target NG-RAN node IP addr

33、ess (received in XnAP) associated to the UL transport bearer of that particular flow. The Transport Layer Address signalled in XnAP 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)

34、160 bits if both IPv4 and IPv6 addresses are signalled, in which case the 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 point

35、s shall be configurable by O&M based on 5G QoS Class Identifier (5QI) ETSI ETSI TS 138 424 V15.0.0 (2018-07)73GPP TS 38.424 version 15.0.0 Release 15characteristics (QoS details are FFS) and other NG-RAN traffic parameters. Traffic categories are implementation-specific and may be determined from th

36、e application parameters. ETSI ETSI TS 138 424 V15.0.0 (2018-07)83GPP TS 38.424 version 15.0.0 Release 15Annex A (informative): Change history Change history Date Meeting TDoc CR Rev Cat Subject/Comment New version May 2017 R3#96 R3-171482 Initial draft TS 0.0.2 May 2017 R3#96 R3-172020 FFS for GTP-

37、U reference Flows instead of bearers Diffserv codepoints and 5QI 0.1.0 June 2017 R3 NR#02 R3-172635 0.1.0 agreed 0.2.0 January 2018 R3 NR#03 R3-180546 Correct specification name, NG-RAN node instead of Gnb 0.3.0 April 2018 R3#99bis R3-182528 Editorial in document title Remove FFS 0.4.0 June 2018 RAN#80 RP-180814 Presentation to RAN 1.0.0 2018-06 RAN#80 - - - Specification approved at TSG-RAN and placed under change control 15.0.0 ETSI ETSI TS 138 424 V15.0.0 (2018-07)93GPP TS 38.424 version 15.0.0 Release 15History Document history V15.0.0 July 2018 Publication