1、 ETSI TS 138 425 V15.2.0 (2018-07) 5G; NG-RAN; NR user plane protocol (3GPP TS 38.425 version 15.2.0 Release 15) TECHNICAL SPECIFICATION ETSI ETSI TS 138 425 V15.2.0 (2018-07)13GPP TS 38.425 version 15.2.0 Release 15Reference DTS/TSGR-0338425vf20 Keywords 5G ETSI 650 Route des Lucioles F-06921 Sophi
2、a 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 downloaded from: http:/www.etsi.org/standards-search The pre
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8、anizational 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 138 425 V15.2.0 (2018-07)23GPP TS 38.425 version 15.2.0 Release 15Intellectual Property Rights Essential patents IPRs essential
9、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: “Intellectual Property Rights (IPRs); Essential, or potentially
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13、cts, 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 reports using their 3GPP identities, UMTS identities or GSM i
14、dentities. 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 terminology In the present document “shall“, “shall not“, “should
15、“, “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 ETSI deliverables except when used in direct citation. ETSI
16、 ETSI TS 138 425 V15.2.0 (2018-07)33GPP TS 38.425 version 15.2.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g31 Scope 6g32 References 6g33 Definitions and abbreviations . 6g33.1 Definitions 6g33.2 Abbreviations . 6g34 General . 7g34.1 Gene
17、ral aspects . 7g35 NR user plane protocol . 7g35.1 General . 7g35.2 NR user plane protocol layer services 7g35.3 Services expected from the Transport Network Layer . 8g35.4 Elementary procedures . 9g35.4.1 Transfer of Downlink User Data . 9g35.4.1.1 Successful operation 9g35.4.1.2 Unsuccessful opera
18、tion . 9g35.4.2 Downlink Data Delivery Status 9g35.4.2.1 Successful operation 9g35.4.2.2 Unsuccessful operation . 11g35.4.3 Transfer of Assistance Information 11g35.4.3.1 Successful operation 11g35.5 Elements for the NR user plane protocol 12g35.5.1 General 12g35.5.2 Frame format for the NR user pla
19、ne protocol . 13g35.5.2.1 DL USER DATA (PDU Type 0) 13g35.5.2.2 DL DATA DELIVERY STATUS (PDU Type 1) . 13g35.5.2.3 ASSISTANCE INFORMATION (PDU Type 2) 14g35.5.3 Coding of information elements in frames . 15g35.5.3.1 PDU Type . 15g35.5.3.2 Spare . 15g35.5.3.3 Report polling . 15g35.5.3.4 NR-U Sequenc
20、e Number . 15g35.5.3.5 Desired buffer size for the data radio bearer . 15g35.5.3.6 Desired Data Rate . 16g35.5.3.7 DL Flush . 16g35.5.3.8 DL discard NR PDCP PDU SN 16g35.5.3.9 DL Discard Blocks 16g35.5.3.10 DL discard NR PDCP PDU SN start 16g35.5.3.11 DL discard Number of blocks . 16g35.5.3.12 Disca
21、rded Block size . 16g35.5.3.13 Lost Packet Report 17g35.5.3.14 Final Frame Indication 17g35.5.3.15 Number of lost NR-U Sequence Number ranges reported 17g35.5.3.16 Start of lost NR-U Sequence Number range . 17g35.5.3.17 End of lost NR-U Sequence Number range 17g35.5.3.18 Highest Delivered NR PDCP SN
22、 Ind 17g35.5.3.19 Highest successfully delivered NR PDCP Sequence Number 17g35.5.3.20 Highest Transmitted NR PDCP SN Ind 17g35.5.3.21 Highest transmitted NR PDCP Sequence Number 18g35.5.3.22 Cause Report . 18g35.5.3.23 Cause Value 18g3ETSI ETSI TS 138 425 V15.2.0 (2018-07)43GPP TS 38.425 version 15.
23、2.0 Release 155.5.3.24 Padding . 18g35.5.3.28 Void. 18g35.5.3.29 Retransmission flag . 18g35.5.3.30 Highest Delivered Retransmitted NR PDCP SN Ind 18g35.5.3.31 Highest Retransmitted NR PDCP SN Ind . 18g35.5.3.32 Highest successfully delivered retransmitted NR PDCP Sequence Number 19g35.5.3.33 Highes
24、t retransmitted NR PDCP Sequence Number . 19g35.5.3.34 Data Rate Indication 19g35.5.3.35 PDCP Duplication Indication 19g35.5.3.36 PDCP Duplication Activation Suggestion 19g35.5.3.37 Number of Assistance Information Field 19g35.5.3.38 Assistance Information Type 19g35.5.3.39 Radio Quality Assistance
25、Information 20g35.5.3.40 Assistance Information Report Polling Flag . 20g35.5.4 Timers . 20g35.6 Handling of unknown, unforeseen and erroneous protocol data 20g3Annex A (informative): Example of using future Extension 21g3A.1 Example of using Future Extension field . 21g3A.1.1 New IE Flags 21g3Annex
26、 B (informative): Change history . 22g3History 23g3ETSI ETSI TS 138 425 V15.2.0 (2018-07)53GPP TS 38.425 version 15.2.0 Release 15Foreword This Technical Specification has been produced by the 3rd Generation Partnership Project (3GPP). The contents of the present document are subject to continuing w
27、ork 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 change of release date and an increase in version number as follows: Version x.y.z where: x the first digit: 1 presented
28、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 substance, i.e. technical enhancements, corrections, updates, etc. z the third digit is incremented when editorial only cha
29、nges have been incorporated in the document. ETSI ETSI TS 138 425 V15.2.0 (2018-07)63GPP TS 38.425 version 15.2.0 Release 151 Scope The present document specifies the NR user plane protocol functions used within NG-RAN and, for EN-DC, within E-UTRAN. NR user plane protocol functions may reside in no
30、des terminating either the X2-U (for EN-DC) or the Xn-U or the F1-U interface. 2 References 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 nu
31、mber, 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), a non-specific reference implicitly refers to the latest v
32、ersion of that document in the same Release as the present document. 1 3GPP TR 21.905: “Vocabulary for 3GPP Specifications“. 2 3GPP TS 29.281: “General Packet Radio System (GPRS) Tunnelling Protocol User Plane (GTPv1-U)“. 3 3GPP TS 37.340: “NR; Multi-connectivity; Overall description; Stage-2“. 4 3G
33、PP TS 36.321: “Evolved Universal Terrestrial Radio Access (E-UTRA); Medium Access Control (MAC) protocol specification“. 5 3GPP TS 38.321: “NR; Medium Access Control (MAC) protocol specification“. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the terms and
34、 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. Corresponding node: a node interacting with a node hosting NR PDCP for flow control. Master node: as defined in T
35、S 37.340 3. Secondary node: as defined in TS 37.340 3. 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 an
36、y, in 3GPP TR 21.905 1. EN-DC E-UTRA-NR Dual Connectivity MR-DC Multi-RAT Dual Connectivity ETSI ETSI TS 138 425 V15.2.0 (2018-07)73GPP TS 38.425 version 15.2.0 Release 154 General 4.1 General aspects The NR user plane protocol is located in the User Plane of the Radio Network layer over either the
37、Xn or the X2 or the F1 interface. The NR user plane protocol is used to convey control information related to the user data flow management of data radio bearers. Each NR user plane protocol instance is associated to one data radio bearer only. If configured, NR user plane protocol instances exist a
38、t the Master node and the Secondary node in the context of MR-DC or at nodes hosting F1-U protocol terminations. The NR user plane protocol supports direct communication between NR user plane protocol entities, regardless of whether they terminate the same or different user plane interfaces. NOTE: U
39、ser data radio bearers may be setup for data forwarding purposes during Xn HO or during DC related mobility do not require the execution of any additional data radio bearer related user plane protocol functions related to an NR user plane protocol instance. On each data radio bearer, the NR user pla
40、ne protocol operates with RLC AM or RLC UM. In this version of the present document, NR user plane protocol data is conveyed by GTP-U protocol means, more specifically, by means of the “NR RAN Container“ GTP-U extension header as defined in TS 29.281 2. 5 NR user plane protocol 5.1 General The NR us
41、er plane protocol layer is using services of the transport network layer in order to allow flow control of user data packets transferred from the node hosting NR PDCP to the corresponding node. 5.2 NR user plane protocol layer services The following functions are provided by the NR user plane protoc
42、ol: - Provision of NR user plane specific sequence number information for user data transferred from the node hosting NR PDCP to the corresponding node for a specific data radio bearer. - Information of successful in sequence delivery of NR PDCP PDUs to the UE from the corresponding node for user da
43、ta associated with a specific data radio bearer. - Information of NR PDCP PDUs that were not delivered to the UE or the lower layers. - Information of NR PDCP PDUs transmitted to the lower layers for user data associated with a specific data radio bearer. - Information of downlink NR PDCP PDUs to be
44、 discarded for user data associated with a specific data radio bearer; - Information of the currently desired buffer size at the corresponding node for transmitting to the UE user data associated with a specific data radio bearer. - Information of the currently desired data rate in bytes at the corr
45、esponding node for transmitting to the UE user data associated with a specific data radio bearer configured for the UE at the corresponding node; - Information of successful in sequence delivery of NR PDCP PDUs to the UE from the corresponding node for retransmission user data associate with a speci
46、fic data radio bearer; - Information of NR PDCP PDUs transmitted to the lower layers for retransmission user data associated with a specific data radio bearer. ETSI ETSI TS 138 425 V15.2.0 (2018-07)83GPP TS 38.425 version 15.2.0 Release 15- Information of the specific events at the corresponding nod
47、e. - Information on Radio Link Quality from the corresponding node for user data associated with a specific data bearer. 5.3 Services expected from the Transport Network Layer The NR user plane protocol layer expects the following services from the Transport Network Layer: - Transfer of user data. E
48、TSI ETSI TS 138 425 V15.2.0 (2018-07)93GPP TS 38.425 version 15.2.0 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 NR-U specific sequence number information at the transfe
49、r of user data carrying a DL NR PDCP PDU from the node hosting the NR PDCP entity to the corresponding node. An NR user plane instance making use of the Transfer of Downlink User Data procedure is associated to a single data radio bearer only. The node hosting the NR PDCP entity shall assign consecutive NR-U sequence numbers to each transferred NR-U packet. If the Assistance Information Report Polling Flag is equal to 1, the corresponding node shall send the ASSISTANCE INFORMATION DATA to the node hosting the NR PDCP. The corresponding node shall detect
