1、 ETSI TS 136 465 V15.0.0 (2018-07) LTE; Evolved Universal Terrestrial Radio Access Network (E-UTRAN) and Wireless Local Area Network (WLAN); Xw interface user plane protocol (3GPP TS 36.465 version 15.0.0 Release 15) TECHNICAL SPECIFICATION ETSI ETSI TS 136 465 V15.0.0 (2018-07)13GPP TS 36.465 versi
2、on 15.0.0 Release 15Reference RTS/TSGR-0336465vf00 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
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9、7)23GPP TS 36.465 version 15.0.0 Release 15Intellectual 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-membe
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15、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 described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisio
16、ns). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TS 136 465 V15.0.0 (2018-07)33GPP TS 36.465 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References
17、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 6g35.3 Services expected from the Xw Transport Network Layer 7g35.4 Elementary procedures
18、. 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 8g35.4.2.1 Successful operation 8g35.4.2.2 Unsuccessful operation . 9g35.5 Elements for the Xw user plane protocol . 10g35.5.1 General 10g35.5.2 Fram
19、e 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 information 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
20、.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 . 13g35.5.3.8 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 Seque
21、nce Number range . 14g35.5.3.11 End of lost Xw-U Sequence Number range 14g35.5.3.12 Padding . 14g35.5.4 Timers . 14g3Annex A (informative): Change history . 15g3History 16g3ETSI ETSI TS 136 465 V15.0.0 (2018-07)43GPP TS 36.465 version 15.0.0 Release 15Foreword This Technical Specification has been p
22、roduced 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 be re-released by the TSG with an identifying
23、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 second digit is incremented for all changes of su
24、bstance, 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 V15.0.0 (2018-07)53GPP TS 36.465 version 15.0.0 Release 151 Scope The present document specifies the Xw user plan
25、e protocol being used over the Xw interface for LTE/WLAN Aggregation (LWA) and LTE WLAN Radio Level Integration with IPsec Tunnel (LWIP). 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. - References are eit
26、her 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 (including a GSM document),
27、 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 Terrestrial Radio Acces
28、s Network (E-UTRAN); Overall description; Stage 2“. 3 3GPP TS 29.281: “General Packet Radio System (GPRS) Tunnelling Protocol User Plane (GTPv1-U)“. 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 f
29、ollowing 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 Aggregation, a PDU with DRB ID generated by LWAAP entity f
30、or 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: Defined in TS 36.300 2. Xw: logical interface between eN
31、B 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 abbreviation, if any, in 3GPP TR 21.905 1. eNB E-UTRAN Node LWA
32、LTE-WLAN Aggregation ETSI ETSI TS 136 465 V15.0.0 (2018-07)63GPP TS 36.465 version 15.0.0 Release 15LWIP 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 located in the User Plane of the Radio Network layer ove
33、r 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 successful delivery to the UE, as defined in TS 36.300 2. In
34、 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. Each Xw UP protocol instance is associated to one E-RAB
35、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 the LWA bearer option. If configured, Xw UP protocol
36、 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 “Xw RAN Container” GTP-U extension header as defined in TS 29.281 3. 5 Xw user
37、 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 following functions are provided by the Xw UP pro
38、tocol: - 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 the UE of LWA PDUs from WT for user data associate
39、d 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 associated with a specific E-RAB configured with th
40、e 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 the Xw UP protocol: - Provision of Xw UP specific
41、sequence number information for user data transferred from the eNB to the WT for a specific UE configured with the LWIP bearer option; - Information of successful transmission towards the UE of LWIP PDUs from WT for user data of a UE configured with the LWIP bearer option; ETSI ETSI TS 136 465 V15.0
42、.0 (2018-07)73GPP TS 36.465 version 15.0.0 Release 15- 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 with the LWIP bearer option; - Information of the c
43、urrently 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 services from the Transport Network Layer: - Transfer o
44、f user data. ETSI ETSI TS 136 465 V15.0.0 (2018-07)83GPP TS 36.465 version 15.0.0 Release 155.4 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 provide Xw-U specific sequence number information
45、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. The Transfer of Downlink User Data procedure is i
46、nvoked 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 Downlink User Data procedure is invoked whenever use
47、r 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 number after it has declared the respective Xw-U
48、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, the Transfer of Downlink User Data procedure and th
49、e 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.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 Unsuccessful
