1、 ETSI TS 1EvolvedRadio Access Network (Xw interf(3GPP TS 36.4TECHNICAL SPECIFICATION136 465 V13.0.0 (2016LTE; ed Universal Terrestrial k (E-UTRAN) and Wireless LArface user plane protocol .465 version 13.0.0 Release 1316-04) AN (WLAN); 13) ETSI ETSI TS 136 465 V13.0.0 (2016-04)13GPP TS 36.465 versio
2、n 13.0.0 Release 13Reference RTS/TSGR-0336465vd00 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 I
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6、ng services: 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 ver
7、sion 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 2016. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI regis
8、tered 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. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 136 465 V13.0.0 (2016-04)23GPP TS 36.465 vers
9、ion 13.0.0 Release 13Intellectual 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 non-members, and can be found in ETSI SR 000 314: “
10、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/). Pursuant to the ETSI IPR Policy, no investigation,
11、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 present document. Foreword This Technical Specification (T
12、S) 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 references to the corresponding ETSI deliverables. The cr
13、oss 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“, “can“ and “cannot“ are to be interpreted as descr
14、ibed 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 V13.0.0 (2016-04)33GPP TS 36.465 version 13.0.0 Release 13Contents Intellectual Property
15、 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 General . 6g35.2 Xw user plane protocol layer services
16、6g35.3 Services expected from the Xw Transport Network Layer 6g35.4 Elementary procedures . 7g35.4.1 Transfer of Downlink User Data . 7g35.4.1.1 Successful operation 7g35.4.1.2 Unsuccessful operation . 7g35.4.2 Downlink Data Delivery Status 7g35.4.2.1 Successful operation 7g35.4.2.2 Unsuccessful ope
17、ration . 8g35.5 Elements for the Xw user plane protocol . 9g35.5.1 General 9g35.5.2 Frame format for the Xw user plane protocol . 10g35.5.2.1 DL USER DATA (PDU Type 0) 10g35.5.2.2 DL DATA DELIVERY STATUS (PDU Type 1) . 11g35.5.3 Coding of information elements in frames . 12g35.5.3.1 PDU Type . 12g35
18、.5.3.2 Spare . 12g35.5.3.3 Xw-U Sequence Number 12g35.5.3.4 Lost Packet Report 12g35.5.3.5 Final Frame Indication 12g35.5.3.6 Highest successfully delivered Xw-U Sequence Number . 12g35.5.3.7 Desired buffer size for the E-RAB 12g35.5.3.8 Minimum desired buffer size for the UE . 13g35.5.3.9 Number of
19、 lost Xw-U Sequence Number ranges reported 13g35.5.3.10 Start of lost Xw-U Sequence Number range . 13g35.5.3.11 End of lost Xw-U Sequence Number range 13g35.5.3.12 Spare extension . 13g35.5.4 Timers . 13g3Annex A (informative): Change history . 14g3History 15g3ETSI ETSI TS 136 465 V13.0.0 (2016-04)4
20、3GPP TS 36.465 version 13.0.0 Release 13Foreword 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
21、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 presented to TSG for approval; 3 or greater indicates TSG approve
22、d 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 in the document. ETSI ETSI TS 136 465 V13.0.0 (2016-04)53GPP TS
23、 36.465 version 13.0.0 Release 131 Scope The present document specifies the Xw user plane protocol being used over the Xw interface for LTE/WLAN Aggregation (LWA). 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present docu
24、ment. - 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 document (
25、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 36.300: Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal
26、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 terms and definitions given in 3GPP TR 21.905 1 and the following apply. A term defined in the present document takes precedence ove
27、r 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. WLAN Termination: Defined in TS 36.300 2. Xw: logical interface between eNB and WT. 3.2 Abbreviations For the purposes of the present document, the abbrev
28、iations 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. eNB E-UTRAN Node LWA LTE-WLAN Aggregation WT WLAN Termination ETSI ETSI TS 136 465 V13.0.0 (2016-04)6
29、3GPP TS 36.465 version 13.0.0 Release 134 General 4.1 General aspects The Xw user plane (Xw UP) protocol is located in the User Plane of the Radio Network layer over the Xw interface. The Xw UP protocol is used to convey control information related to the user data flow management of E-RABs. The WT
30、flow control feedback may support indication of successful transmission towards a UE, or successful delivery to the UE, as defined in TS 36.300 2. Each 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
31、Aggregation only, more specifically, only for Xw user data bearers setup for E-RABs configured with 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 dat
32、a is conveyed by GTP-U protocol means, more specifically, by means of the RAN Container GTP-U extension 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
33、 transferred over the Xw interface. 5.2 Xw user plane protocol layer services The 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 opt
34、ion; - Information of successful transmission towards or in sequence delivery to the UE of LWAAP PDUs from WT for user data associated with a specific E-RAB configured with the split bearer option; - Information of LWAAP PDUs that were not transferred towards or not delivered to the UE; - Informatio
35、n of the currently desired buffer size at the WT for transmitting to the UE user data associated 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 configure
36、d with the LWA bearer option. 5.3 Services expected from the Xw Transport Network Layer The Xw user plane protocol layer expects the following services from the Transport Network Layer: - Transfer of user data. ETSI ETSI TS 136 465 V13.0.0 (2016-04)73GPP TS 36.465 version 13.0.0 Release 135.4 Elemen
37、tary 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 provide Xw-U specific sequence number information at the transfer of user data carrying a DL LWAAP PDU from the eNB to the WT via the Xw-U interface. An
38、 Xw user plane instance making use of the Transfer of Downlink User Data procedure is associated to a single E-RAB only. 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. The eNB shall assign consecutive X
39、w-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 number after it has declared the respective Xw-U packet as being lost. The WT shall transfer the remaining LWAAP PDUs towards the UE and memorise the highest
40、 Xw-U sequence number of the PDCP PDU that was successfully transferred towards or delivered to the UE. NOTE: The 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
41、use the Transfer of Downlink User Data procedure, PDCP HFN synchronization should be ensured by other means, e.g. UE feedback. eNB WTDL USER DATAFigure 5.4.1.1-1: Successful Transfer of Downlink User Data 5.4.1.2 Unsuccessful operation Void. 5.4.2 Downlink Data Delivery Status 5.4.2.1 Successful ope
42、ration 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. When the WT decides to trigger the Feedback for Downlink Data Delivery procedure it shall repor
43、t: a) the highest Xw-U sequence number successfully transferred towards or delivered to the UE among those PDUs received from the eNB; b) the desired buffer size in bytes for the concerned E-RAB; c) the minimum desired buffer size in bytes for the UE; d) the Xw-U packets that were declared as being
44、lost by the WT and have not yet been reported to the eNB within the DL DATA DELIVERY STATUS frame. ETSI ETSI TS 136 465 V13.0.0 (2016-04)83GPP TS 36.465 version 13.0.0 Release 13NOTE: If an E-UTRAN deployment has decided not to use the Transfer of Downlink User Data procedure, d) above is not applic
45、able. The DL DATA DELIVERY STATUS frame shall also include an indication whether the frame is the last DL status report received in the course of releasing a bearer from the WT. When receiving such indication, if applicable, the eNB considers that no more UL data is to be expected from the WT. The e
46、NB, when receiving the DL DATA DELIVERY STATUS frame: - regards the desired buffer size under b) and c) above as the amount of data desired from the WT being declared; - from the Xw-U sequence number reported under a) above within the same frame, as well as from the most recently reported Xw-U seque
47、nce number(s) of all other E-RABs established for the UE; - as the momentary desired buffer sizes, independent of buffer sizes indicated in the past. - is allowed to remove the buffered PDCP PDUs according to the feedback of successfully delivered PDCP PDUs; - decides upon the actions necessary to t
48、ake for PDCP PDUs reported other than successfully delivered. After being reported to the eNB, the WT removes the respective Xw-U sequence numbers. eNB WTDL DATA DELIVERY STATUSFigure 5.4.2.1-1: Successful Downlink Data Delivery Status 5.4.2.2 Unsuccessful operation Void. ETSI ETSI TS 136 465 V13.0.
49、0 (2016-04)93GPP TS 36.465 version 13.0.0 Release 135.5 Elements for the Xw user plane protocol 5.5.1 General In the present document the structure of frames are specified by using figures similar to figure 5.5.1-1. Bits Number of Octets7 6 5 4 3 2 1 0 Field 1 Field 2 1 Octet 1 Field 3 Field 4 2 Octet 2 Field 4 continue Spare Octet 3 Field 6 2 Octet 4 Octet 5 Field 6 continue Padding Spare extension 0-m Figure 5.5.1-1: Example frame format Unless otherwise indicated, fields which consist of multiple bits within an octet have the most significan
