1、 ETSI TS 136 422 V15.0.0 (2018-07) LTE; Evolved Universal Terrestrial Radio Access Network (E-UTRAN); X2 signalling transport (3GPP TS 36.422 version 15.0.0 Release 15) TECHNICAL SPECIFICATION ETSI ETSI TS 136 422 V15.0.0 (2018-07)13GPP TS 36.422 version 15.0.0 Release 15Reference RTS/TSGR-0336422vf
2、00 Keywords LTE 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 present document can be dow
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8、stered for the benefit of its Members and of the 3GPP Organizational 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 136 422 V15.0.0 (2018-07)23GPP TS 36.422 version 15.0.0 Release 15Intel
9、lectual Property Rights Essential patents IPRs essential 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: “Intell
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13、ument does not constitute an endorsement by ETSI of products, 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 repo
14、rts using their 3GPP identities, UMTS identities or GSM 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 terminol
15、ogy 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 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ET
16、SI deliverables except when used in direct citation. ETSI ETSI TS 136 422 V15.0.0 (2018-07)33GPP TS 36.422 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 Definitions, symbols and abbreviations . 5g
17、33.1 Definitions 5g33.3 Abbreviations . 5g34. X2 signalling bearer . 5g34.1 Function and protocol stack 5g35 Data link layer 6g36 IP layer . 6g37 Transport layer . 6g3Annex A (informative): Change History 8g3History 9g3ETSI ETSI TS 136 422 V15.0.0 (2018-07)43GPP TS 36.422 version 15.0.0 Release 15Fo
18、reword 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 contents of the present document, it will
19、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 document under change control. y the sec
20、ond 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. ETSI ETSI TS 136 422 V15.0.0 (2018-07)53GPP TS 36.422 version 15.0.0 Release 151 Scope T
21、he present document specifies the standards for Signalling Transport to be used across X2 interface. X2 interface is a logical interface between eNBs. The present document describes how the X2-AP signalling messages are transported over X2. 2 References The following documents contain provisions whi
22、ch, 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
23、, 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 3GPP TR 21.905: “Vocabulary for 3GPP Specifications“. 2 IETF RFC 24
24、60 (1998-12): “Internet Protocol, Version 6 (IPv6) Specification“. 3 IETF RFC 791(1981-09): “Internet Protocol“. 4 IETF RFC 2474 (1998-12): “Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers“. 5 IETF RFC 4960 (2007-09): “Stream Control Transmission Protocol“. 3
25、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 term defined in the present document takes precedence over the definition of the same term, if any, in TR 21.905 1. X2: logical i
26、nterface between two eNBs. 3.3 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 21.905 1. eNB E-UTRAN No
27、de B DiffServ Differentiated ServiceIANA Internet Assigned Number Authority IP Internet Protocol PPP Point to Point Protocol SCTP Stream Control Transmission Protocol 4. X2 signalling bearer 4.1 Function and protocol stack X2 signalling bearer provides the following functions: ETSI ETSI TS 136 422 V
28、15.0.0 (2018-07)63GPP TS 36.422 version 15.0.0 Release 15- Provision of reliable transfer of X2-AP message over X2 interface. - Provision of networking and routeing function - Provision of redundancy in the signalling network - Support for flow control and congestion control The protocol stack for X
29、2 Signalling Bearer is shown in figure 4.1 and details on each protocol are described in the following sections. SCTP IP Data link layer X2-AP Physical layer Radio Network Layer TransportNetworkLayer Figure 4.1: X2 signalling bearer protocol stack The Transport Network Layer is based on IP transport
30、, 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 eNB shall support IPv6 (IETF RFC 2460 2) and/or IPv4 (IETF RFC 791 3). The IP layer of X2 only supports point-to-point transmissio
31、n for delivering X2-AP message. The eNB shall support the Diffserv Code Point marking as described in IETF RFC 2474 4. 7 Transport layer SCTP (IETF RFC 4960 5) shall be supported as the transport layer of X2 signalling bearer. The Payload Protocol Identifier assigned by IANA to be used by SCTP for t
32、he application layer protocol X2AP is 27. SCTP refers to the 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 eNB pair
33、. An eNB shall use the Destination Port Number value 36422 assigned by IANA to be used for X2AP and this value shall also be used in Source Port Number by all eNBs within a network. NOTE: A multi-homed eNB implementation should provide the correspondent eNB with the set of IP addresses supported dur
34、ing SCTP association establishment unless the correspondent eNB already has this information e.g. through IP address management. An arbitrary eNB shall be able to initiate the INIT procedure towards another eNB for establishing the SCTP association. ETSI ETSI TS 136 422 V15.0.0 (2018-07)73GPP TS 36.
35、422 version 15.0.0 Release 15Within the SCTP association established between one eNB pair; - A single pair of stream identifiers shall be reserved for the sole use of X2AP elementary procedures that utilize non UE-associated signalling. - At least one pair of stream identifiers shall be reserved for
36、 the sole use of X2AP elementary procedures that utilize UE-associated signalling. However a few pairs (i.e. more than one) 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.
37、 Transport network redundancy may be achieved by SCTP multi-homing between two end-points, of which one or both is assigned 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 either of the eNBs, at any
38、time for an already established SCTP association, which shall be handled as defined in IETF RFC 4960 5 in subclause 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
39、messages. ETSI ETSI TS 136 422 V15.0.0 (2018-07)83GPP TS 36.422 version 15.0.0 Release 15Annex A (informative): Change History TSG # TSG Doc. CR Rev Subject/Comment New 38 Apecification approved at TSG-RAN and placed under change control 8.0.0 39 RP-080077 0001 - Dedication of common streams over X2
40、 8.1.0 40 RP-080301 0003 - SCTP flow control and overload protection 8.2.0 41 RP-080583 0005 1 Correct the wording of common and dedicated procedures 8.3.0 41 RP-080583 0006 2 SCTP restart function for X2 interface 8.3.0 41 RP-080583 0007 - Clarification of SCTP Congestion Indication over X2 8.3.0 4
41、2 RP-080855 0008 1 Further clarification of SCTP Association handling 8.4.0 42 RP-080855 0009 Removal of chapter 8 8.4.0 43 RP-090090 0010 1 The use of the number of stream ID for a UE-associated signalling 8.5.0 43 RP-090085 0011 1 Clarification of SCTP streams 8.5.0 43 RP-090085 0012 1 Clarificati
42、on the overload protection function support in SCTP 8.5.0 46 RP-091183 0014 1 Specification of SCTP destination port number 8.6.0 - - - - Created Rel-9 version based on v8.6.0 9.0.0 47 RP-100213 0016 Specification of Payload Identifier 9.1.0 50 Created Rel-10 version based on v. 9.1.0 10.0.0 SP-49 S
43、P-100629 Clarification on the use of References (TS 21.801 CR#0030) 10.0.1 52 RP-110685 0018 Correction to the References in 36.422 10.1.0 09/2012 Update to Rel-11 version (MCC) 11.0.0 09/2014 Update to Rel-12 version (MCC) 12.0.0 12/2015 Update to Rel-13 version (MCC) 13.0.0 Change history Date Mee
44、ting TDoc CR Rev Cat Subject/Comment New version 2017-03 SA#75 Promotion to Release 14 without technical change 14.0.0 2018-06 SA#80 - - - - Promotion to Release 15 without technical change 15.0.0 ETSI ETSI TS 136 422 V15.0.0 (2018-07)93GPP TS 36.422 version 15.0.0 Release 15History Document history V15.0.0 July 2018 Publication
