1、 ETSI TS 136 465 V14.0.0 (2017-04) LTE; Evolved Universal Terrestrial Radio Access Network (E-UTRAN) and Wireless LAN (WLAN); Xw interface user plane protocol (3GPP TS 36.465 version 14.0.0 Release 14) TECHNICAL SPECIFICATION ETSI ETSI TS 136 465 V14.0.0 (2017-04)13GPP TS 36.465 version 14.0.0 Relea
2、se 14Reference RTS/TSGR-0336465ve00 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 notic
3、e The present document can be downloaded from: http:/www.etsi.org/standards-search The present document may be made available in electronic versions and/or in print. The content of any electronic and/or print versions of the present document shall not be modified without the prior written authorizat
4、ion of ETSI. In case of any existing or perceived difference in contents between such versions and/or in print, the only prevailing document is the print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aw
5、are that the document may be subject to revision or change of status. Information on the current 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 s
6、ervices: https:/portal.etsi.org/People/CommiteeSupportStaff.aspx Copyright Notification No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm except as authorized by written permission of ETSI. The content of the PDF version
7、 shall not be modified without the written authorization of ETSI. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2017. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registere
8、d for the benefit of its Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. oneM2M logo is protected for the benefit of its Members GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI E
9、TSI TS 136 465 V14.0.0 (2017-04)23GPP TS 36.465 version 14.0.0 Release 14Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and
10、 non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, 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/).
11、 Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can 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 presen
12、t document. 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 identities. These should be interpreted as being refer
13、ences 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“, “should not“, “may“, “need not“, “will“, “will not
14、“, “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 TS 136 465 V14.0.0 (2017-04)33GPP TS 36.465 ver
15、sion 14.0.0 Release 14Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 Definitions and abbreviations . 5g33.1 Definitions 5g33.2 Abbreviations . 5g34 General . 6g34.1 General aspects . 6g35 Xw user plane protocol. 6g35.1 Gen
16、eral . 6g35.2 Xw user plane protocol layer services 6g35.3 Services expected from the Xw Transport Network Layer 7g35.4 Elementary procedures . 8g35.4.1 Transfer of Downlink User Data . 8g35.4.1.1 Successful operation 8g35.4.1.2 Unsuccessful operation . 8g35.4.2 Downlink Data Delivery Status 8g35.4.
17、2.1 Successful operation 8g35.4.2.2 Unsuccessful operation . 9g35.5 Elements for the Xw user plane protocol . 10g35.5.1 General 10g35.5.2 Frame format for the Xw user plane protocol . 11g35.5.2.1 DL USER DATA (PDU Type 0) 11g35.5.2.2 DL DATA DELIVERY STATUS (PDU Type 1) . 12g35.5.3 Coding of informa
18、tion elements in frames . 13g35.5.3.1 PDU Type . 13g35.5.3.2 Spare . 13g35.5.3.3 Xw-U Sequence Number 13g35.5.3.4 Lost Packet Report 13g35.5.3.5 Final Frame Indication 13g35.5.3.6 Highest successfully delivered Xw-U Sequence Number . 13g35.5.3.7 Desired buffer size for the E-RAB or UE . 14g35.5.3.8
19、Minimum desired buffer size for the UE . 14g35.5.3.9 Number of lost Xw-U Sequence Number ranges reported 14g35.5.3.10 Start of lost Xw-U Sequence Number range . 14g35.5.3.11 End of lost Xw-U Sequence Number range 14g35.5.3.12 Spare extension . 14g35.5.4 Timers . 15g3Annex A (informative): Change his
20、tory . 16g3History 17g3ETSI ETSI TS 136 465 V14.0.0 (2017-04)43GPP TS 36.465 version 14.0.0 Release 14Foreword 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 ch
21、ange 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 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 pre
22、sented 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. technical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only changes have been incorporated i
23、n the document. ETSI ETSI TS 136 465 V14.0.0 (2017-04)53GPP TS 36.465 version 14.0.0 Release 141 Scope The present document specifies the Xw user plane protocol being used over the Xw interface for LTE/WLAN Aggregation (LWA) and LTE WLAN Radio Level Integration with IPsec Tunnel (LWIP). 2 References
24、 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, subsequent revisio
25、ns 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: “Voc
26、abulary for 3GPP Specifications”. 2 3GPP TS 36.300: “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2”. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the term
27、s 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 3GPP TR 21.905 1. LTE-WLAN Aggregation: Defined in TS 36.300 2. LWA bearer: Defined in TS 36.300 2. LWA PDU: in LTE-WLAN Aggre
28、gation, a PDU with DRB ID generated by LWAAP entity for transmission over WLAN. LWIP bearer: Defined in TS 36.300 2. LWIP option: Defined in TS 36.300 2. LWIP PDU: in LTE WLAN Radio Level Integration with IPsec Tunnel, a PDU generated by LWIPEP entity for transmission over WLAN WLAN Termination: Def
29、ined in TS 36.300 2. 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 abbreviatio
30、n, if any, in 3GPP TR 21.905 1. eNB E-UTRAN Node LWA LTE-WLAN Aggregation ETSI ETSI TS 136 465 V14.0.0 (2017-04)63GPP TS 36.465 version 14.0.0 Release 14LWIP LTE WLAN Radio Level Integration with IPsec Tunnel WT WLAN Termination 4 General 4.1 General aspects The Xw user plane (Xw UP) protocol is loc
31、ated in the User Plane of the Radio Network layer over the Xw interface. In LWA option, the Xw UP protocol is used to convey control information related to the user data flow management of E-RABs. The WT flow control feedback may support indication of successful transmission towards a UE, or success
32、ful delivery to the UE, as defined in TS 36.300 2. In LWIP option, the Xw UP protocol is used to convey control information related to the user data flow management of each UE. The WT flow control feedback may support indication of successful transmission towards a UE, as defined in TS 36.300 2. Eac
33、h Xw UP protocol instance is associated to one E-RAB only. This version of the present document defines the Xw UP protocol in the context of LTE-WLAN Aggregation and LWIP option, more specifically, for UE user data setup for LWIP operation or for Xw user data bearers setup for E-RABs configured with
34、 the LWA bearer option. If configured, Xw UP protocol instances exist at the eNB and the WT between which the Xw user data bearers are setup. In this version of the present document, Xw UP protocol data is conveyed by GTP-U protocol means, more specifically, by means of the “RAN Container” GTP-U ext
35、ension header as defined in TS 29.281 3. 5 Xw user plane protocol 5.1 General The Xw UP protocol layer is using services of the transport network layer in order to allow flow control of user data packets transferred over the Xw interface. 5.2 Xw user plane protocol layer services For LWA option, the
36、 following functions are provided by the Xw UP protocol: - Provision of Xw UP specific sequence number information for user data transferred from the eNB to the WT for a specific E-RAB configured with the LWA bearer option; - Information of successful transmission towards or in sequence delivery to
37、the UE of LWA PDUs from WT for user data associated with a specific E-RAB configured with the LWA bearer option; - Information of LWA PDUs that were not transferred towards or not delivered to the UE; - Information of the currently desired buffer size at the WT for transmitting to the UE user data a
38、ssociated with a specific E-RAB configured with the LWA bearer option; - Information of the currently minimum desired buffer size at the WT for transmitting to the UE user data associated with all E-RABs configured with the LWA bearer option. For LWIP option, the following functions are provided by
39、the Xw UP protocol: - Provision of Xw UP specific sequence number information for user data transferred from the eNB to the WT for a specific UE configured with the LWIP bearer option; ETSI ETSI TS 136 465 V14.0.0 (2017-04)73GPP TS 36.465 version 14.0.0 Release 14- Information of successful transmis
40、sion towards the UE of LWIP PDUs from WT for user data of a UE configured with the LWIP bearer option; - Information of LWIP PDUs that were not transferred towards the UE; - Information of the currently desired buffer size at the WT for transmitting to the UE user data for a specific UE configured w
41、ith the LWIP bearer option; - Information of the currently minimum desired buffer size at the WT for transmitting to the UE user data for UEs configured with the LWIP bearer option. 5.3 Services expected from the Xw Transport Network Layer The Xw user plane protocol layer expects the following servi
42、ces from the Transport Network Layer: - Transfer of user data. ETSI ETSI TS 136 465 V14.0.0 (2017-04)83GPP TS 36.465 version 14.0.0 Release 145.4 Elementary procedures 5.4.1 Transfer of Downlink User Data 5.4.1.1 Successful operation The purpose of the Transfer of Downlink User Data procedure is to
43、provide Xw-U specific sequence number information at the transfer of user data carrying a DL LWA PDU or DL LWIP PDU from the eNB to the WT via the Xw-U interface. In LWA option, an Xw user plane instance making use of the Transfer of Downlink User Data procedure is associated to a single E-RAB only.
44、 The Transfer of Downlink User Data procedure is invoked whenever user data for that particular E-RAB needs to be sent across the Xw-U interface. In LWIP option, an Xw user plane instance making use of the Transfer of Downlink User Data procedure is associated to a single UE only. The Transfer of Do
45、wnlink User Data procedure is invoked whenever user data for that particular UE needs to be sent across the Xw-U interface. The eNB shall assign consecutive Xw-U sequence numbers to each transferred Xw-U packet. The WT shall detect whether an Xw-U packet was lost and memorise the respective sequence
46、 number after it has declared the respective Xw-U packet as being “lost”. In LWA option, the WT shall transfer the remaining LWA PDUs towards the UE and memorise the highest Xw-U sequence number of the PDCP PDU that was successfully transferred towards or delivered to the UE. NOTE: For LWA option, t
47、he Transfer of Downlink User Data procedure and the associated feedback of lost Xw-U packets assist the eNB in avoiding PDCP HFN de-synchronisation. If an E-UTRAN deployment decides to not use the Transfer of Downlink User Data procedure, PDCP HFN synchronization should be ensured by other means, e.
48、g. UE feedback. In LWIP option, the WT shall transfer the remaining LWIP PDUs towards the UE and memorise the highest Xw-U sequence number of the LWIP PDU that was successfully transferred towards the UE. eNB WTDL USER DATAFigure 5.4.1.1-1: Successful Transfer of Downlink User Data 5.4.1.2 Unsuccess
49、ful operation Void. 5.4.2 Downlink Data Delivery Status 5.4.2.1 Successful operation The purpose of the Downlink Data Delivery Status procedure is to provide feedback from the WT to the eNB to allow the eNB to control the downlink user data flow via the WT for the respective E-RAB in LWA option or for respective UE in LWIP option. The WT may also transfer uplink user data for the concerned E-RAB to the eNB together with a DL DATA DELIVERY STATUS frame within the same GTP-U PDU. When the WT decides to trigger the Feedback for Downlink Data Delivery
