1、 ETSI TS 138 462 V15.0.0 (2018-07) 5G; NG-RAN; E1 signalling transport (3GPP TS 38.462 version 15.0.0 Release 15) TECHNICAL SPECIFICATION ETSI ETSI TS 138 462 V15.0.0 (2018-07)13GPP TS 38.462 version 15.0.0 Release 15Reference RTS/TSGR-0338462vf00 Keywords 5G ETSI 650 Route des Lucioles F-06921 Soph
2、ia 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 present document can be downloaded from: http:/www.etsi.org/standards-search The pr
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9、 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 ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially
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13、ucts, 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
14、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 under http:/webapp.etsi.org/key/queryform.asp. Modal verbs terminology In the present document “shall“, “shall not“, “shoul
15、d“, “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). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETS
16、I ETSI TS 138 462 V15.0.0 (2018-07)33GPP TS 38.462 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 5g33.3 Abbreviations . 6g34 E1 signalling bearer
17、 6g34.1 Function and protocol stack 6g35 Data link layer 6g36 IP layer . 6g37 Transport layer . 7g3Annex A (informative): Change history . 8g3History 9g3ETSI ETSI TS 138 462 V15.0.0 (2018-07)43GPP TS 38.462 version 15.0.0 Release 15Foreword This Technical Specification has been produced by the 3rd G
18、eneration 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 of release d
19、ate 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, i.e. techn
20、ical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. ETSI ETSI TS 138 462 V15.0.0 (2018-07)53GPP TS 38.462 version 15.0.0 Release 151 Scope The present document specifies the standards for Signalling Transp
21、ort to be used across the E1 interface. The E1 interface provides means for the interconnection of gNB-CU-CP and gNB-CU-UP within the NG-RAN architecture (TS 38.401 2). 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present
22、 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, the latest version applies. In the case of a reference to a 3GPP docum
23、ent (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 TR 21.905: “Vocabulary for 3GPP Specifications“. 2 3GPP TS 38.401: “NG-RAN; Architecture description“. 3 IETF RFC 2460 (1998-12): “Int
24、ernet Protocol, Version 6 (IPv6) Specification“. 4 IETF RFC 791(1981-09): “Internet Protocol“. 5 IETF RFC 2474 (1998-12): “Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers“. 6 IETF RFC 4960 (2007-09): “Stream Control Transmission Protocol“. 7 3GPP TS 38.460: “N
25、G-RAN; E1 general aspects and principles“. 8 3GPP TS 38.461: “NG-RAN; E1 layer 1“. 9 3GPP TS 38.463: “NG-RAN; E1 Application Protocol (E1AP) “. 10 3GPP TS 38.300: “NR; Overall description; Stage-2“. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the terms a
26、nd 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 3GPP TR 21.905 1. E1: interface between a gNB-CU-CP and a gNB-CU-UP, providing an interconnection point between the gNB-CU-CP and
27、 the gNB-CU-UP. gNB: as defined in TS 38.300 10 gNB-CU: as defined in TS 38.401 2. gNB-CU-CP: as defined in TS 38.401 2. gNB-CU-UP: as defined in TS 38.401 2. ETSI ETSI TS 138 462 V15.0.0 (2018-07)63GPP TS 38.462 version 15.0.0 Release 153.3 Abbreviations For the purposes of the present document, th
28、e 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. DiffServ Differentiated Service IANA Internet Assigned Number Authority IP Internet Protocol
29、PPP Point to Point Protocol SCTP Stream Control Transmission Protocol 4 E1 signalling bearer 4.1 Function and protocol stack E1 signalling bearer provides the following functions: - Provision of reliable transfer of E1AP message over E1 interface. - Provision of networking and routeing function - Pr
30、ovision of redundancy in the signalling network - Support for flow control and congestion control The protocol stack for E1 Signalling Bearer is shown in figure 4.1-1 and details on each protocol are described in the following sections. SCTP IP Data link layer E1AP Physical layer Radio Network Layer
31、 TransportNetworkLayer Figure 4.1-1: E1 signalling bearer protocol stack The Transport Network Layer is based on IP transport, comprising SCTP on top of IP. 5 Data link layer The support of any suitable Data Link Layer protocol, e.g. PPP, Ethernet, etc., shall not be prevented. 6 IP layer The gNB-CU
32、-CP and gNB-CU-UP shall support IPv6 (IETF RFC 2460 3) and/or IPv4 (IETF RFC 791 4). The IP layer of E1 only supports point-to-point transmission for delivering E1AP message. The gNB-CU-CP and gNB-CU-UP shall support the Diffserv Code Point marking as described in IETF RFC 2474 5. ETSI ETSI TS 138 4
33、62 V15.0.0 (2018-07)73GPP TS 38.462 version 15.0.0 Release 157 Transport layer SCTP (IETF RFC 4960 6) shall be supported as the transport layer of E1 signalling bearer. The Payload Protocol Identifier assigned by IANA to be used by SCTP for the application layer protocol E1AP is 64. SCTP refers to t
34、he Stream Control Transmission Protocol developed by the Sigtran working group of the IETF for the purpose of transporting various signalling protocols over IP network. There shall be only one SCTP association established between one gNB-CU-CP and gNB-CU-UP pair. Either the gNB-CU-CP or gNB-CU-UP sh
35、all establish the SCTP association. The SCTP Destination Port number value to be used for E1AP will be assigned by IANA. Note: the concrete value will be updated later once assigned by IANA. Within the SCTP association established between one gNB-CU-CP gNB-CU-UP pair: - a single pair of stream ident
36、ifiers shall be reserved for the sole use of E1AP elementary procedures that utilize non UE-associated signalling. - At least one pair of stream identifiers shall be reserved for the sole use of E1AP elementary procedures that utilize UE-associated signallings. However, a few pairs (i.e. more than o
37、ne) should be reserved. - A single UE-associated signalling shall use one SCTP stream and the stream should not be changed during the communication of the UE-associated signalling. Transport network redundancy may be achieved by SCTP multi-homing between two end-points, of which one or both is assig
38、ned with multiple IP addresses. SCTP end-points shall support a multi-homed remote SCTP end-point. For SCTP endpoint redundancy an INIT may be sent from gNB-CU-CP or gNB-CU-UP, at any time for an already established SCTP association, which shall be handled as defined in IETF RFC 4960 6 in sub clause
39、 5.2. The SCTP congestion control may, using an implementation specific mechanism, initiate higher layer protocols to reduce the signalling traffic at the source and prioritise certain messages. ETSI ETSI TS 138 462 V15.0.0 (2018-07)83GPP TS 38.462 version 15.0.0 Release 15Annex A (informative): Cha
40、nge history Change history Date Meeting TDoc CR Rev Cat Subject/Comment New version 2018-02 R3 #99 R3-181421 - - - Endorsed skeleton 0.0.0 2018-04 R3 #99b R3-182530 - - - New version including Rapporteur TP from RAN3#99b 0.1.0 - R3-182931: Multiple SCTP for E1 - R3-183273: rapporteur updates to 38.4
41、62 0.2.0 2018-06 RAN#80 RP-180768 Submitted to RAN for approval. 1.0.0 2018-06 RAN#80 - - - - Specification approved at TSG-RAN and placed under change control 15.0.0 ETSI ETSI TS 138 462 V15.0.0 (2018-07)93GPP TS 38.462 version 15.0.0 Release 15History Document history V15.0.0 July 2018 Publication
