1、 ETSI TS 136 462 V15.0.0 (2018-07) LTE; Evolved Universal Terrestrial Radio Access Network (E-UTRAN) and Wireless LAN (WLAN); Xw signalling transport (3GPP TS 36.462 version 15.0.0 Release 15) TECHNICAL SPECIFICATION ETSI ETSI TS 136 462 V15.0.0 (2018-07)13GPP TS 36.462 version 15.0.0 Release 15Refe
2、rence RTS/TSGR-0336462vf00 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 pre
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15、sp. 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 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must no
16、t“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TS 136 462 V15.0.0 (2018-07)33GPP TS 36.462 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 Definitions, symbol
17、s and abbreviations . 5g33.1 Definitions 5g33.2 Abbreviations . 5g34 Xw 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 136 462 V15.0.0 (2018-07)43GPP TS 36.462 vers
18、ion 15.0.0 Release 15Foreword 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 pre
19、sent 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 document under ch
20、ange 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. ETSI ETSI TS 136 462 V15.0.0 (2018-07)53GPP TS 36.462 version 15.
21、0.0 Release 151 Scope The present document specifies the standards for Signalling Transport to be used across the Xw interface. The Xw interface is a logical interface between the eNB and the WT. The present document describes how the Xw-AP signalling messages are transported over Xw. 2 References T
22、he 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, subsequent revisions
23、 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 3GPP TR 21.905: “Vocab
24、ulary for 3GPP Specifications“. 2 IETF RFC 2460 (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
25、): “Stream Control Transmission Protocol“. 3 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 sam
26、e term, if any, in TR 21.905 1. Xw: logical interface between eNB and WT. 3.2 Abbreviations For the purposes of 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
27、abbreviation, if any, in 3GPP TR 21.905 1. IANA Internet Assigned Numbers Authority IETF Internet Engineering Task Force PPP Point-to-Point Protocol RFC Request for CommentsSCTP Stream Control Transmission Protocol WT WLAN Termination 4 Xw signalling bearer 4.1 Function and protocol stack Xw signall
28、ing bearer provides the following functions: ETSI ETSI TS 136 462 V15.0.0 (2018-07)63GPP TS 36.462 version 15.0.0 Release 15- Provision of reliable transfer of Xw-AP message over Xw interface. - Provision of networking and routeing function; - Provision of redundancy in the signalling network; - Sup
29、port for flow control and congestion control. The protocol stack for Xw 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 Xw-AP Physical layer Radio Network Layer TransportNetworkLayer Figure 4.1-1: Xw signalling
30、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 eNB shall support Ipv6 (IETF RFC 2460 2) and/or Ipv4 (IET
31、F RFC 791 3). The IP layer of Xw only supports point-to-point transmission for delivering Xw-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 Xw signalling bearer.
32、The Payload Protocol Identifier assigned by IANA to be used by SCTP for the application layer protocol XwAP is 59. 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.
33、There shall be only one SCTP association established between one eNB and WT pair. The eNB shall establish the SCTP association. The SCTP Destination Port Number value assigned by IANA to be used for XwAP is 36462. Within the SCTP association established between an eNB and WT pair; - A single pair of
34、 stream identifiers shall be reserved for the sole use of XwAP elementary procedures that utilize non UE-associated signalling. ETSI ETSI TS 136 462 V15.0.0 (2018-07)73GPP TS 36.462 version 15.0.0 Release 15- At least one pair of stream identifiers shall be reserved for the sole use of XwAP elementa
35、ry 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. Transport network redundancy
36、may be achieved by SCTP multi-homing between two endpoints, of which one or both is assigned with multiple IP addresses. SCTP endpoints shall support a multi-homed remote SCTP endpoint. For SCTP endpoint redundancy an INIT may be sent from WT or eNB, at any time for an already established SCTP assoc
37、iation, which shall be handled as defined in IETF RFC 4960 5 in sub-clause 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 136 462 V15.0.0 (2
38、018-07)83GPP TS 36.462 version 15.0.0 Release 15Annex A (informative): Change history Change history Date Meeting TDoc CR Rev Cat Subject/Comment New version 2015-10 RAN3#89bis R3-152078 Xw signaling support 0.1.0 2015-10 RAN3#89bis R3-152246 Xw_signaling support 0.1.0 2015-10 RAN3#89bis R3-152247 D
39、raft_TS36462_Update 0.1.0 2015-11 RAN3#90 R3-152417 Draft_TS36462_Update 0.2.0 2015-11 RAN3#90 R3-152774 Draft_TS36462_Update 0.3.0 2015-11 RAN#70 RP-151865 Presentation Specification to TSG RAN#70 1.0.0 2016-01 RAN3# Adhoc NB-IOT R3-160004 Editorial update: change “Xw signaling support” to “Xw sign
40、aling transport” 1.1.0 2016-01 RAN3# Adhoc NB-IOT R3-160123 Cover page update 1.2.0 2016-02 RAN3#91 R3-160155 Version update 1.3.0 2016-03 RAN#71 RP-160518 MCC clean up and version update 2.0.0 2016-03 RAN#71 Upgraded to Rel-13 and placed under change control 13.0.0 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 136 462 V15.0.0 (2018-07)93GPP TS 36.462 version 15.0.0 Release 15History Document history V15.0.0 July 2018 Publication
