1、 ETSI TS 125 415 V14.0.0 (2017-04) Universal Mobile Telecommunications System (UMTS); UTRAN Iu interface user plane protocols (3GPP TS 25.415 version 14.0.0 Release 14) TECHNICAL SPECIFICATION ETSI ETSI TS 125 415 V14.0.0 (2017-04)13GPP TS 25.415 version 14.0.0 Release 14Reference RTS/TSGR-0325415ve
2、00 Keywords UMTS 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 present document can be do
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7、he 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 registered for the benefit of its Members
8、. 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 125 415 V14.0.0 (2017-04)23GPP TS 25.415 version 14.0.0 Release 14Intellectual Pr
9、operty 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: “Intellectual Property Rights (IPRs);
10、 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, including IPR searches, has been car
11、ried 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 (TS) has been produced by ETSI 3rd Gen
12、eration 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 cross reference between GSM, UMTS, 3GP
13、P 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 described in clause 3.2 of the ETSI Draft
14、ing 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 125 415 V14.0.0 (2017-04)33GPP TS 25.415 version 14.0.0 Release 14Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs
15、 terminology 2g3Foreword . 6g31 Scope 7g32 References 7g33 Definitions and abbreviations . 8g33.1 Definitions 8g33.2 Abbreviations . 9g33.3 Concepts . 9g33.4 Specification Notations 10g34 General . 10g34.1 General aspects . 10g34.2 Operational and Functional Aspects . 11g34.2.1 Iu UP protocol modes
16、of operation . 11g34.2.2 Transparent mode (TrM) 11g34.2.3 Support mode 12g35 Transparent mode, version 1 13g35.1 General . 13g35.1.1 Operation of the Iu UP in Transparent mode 13g35.1.2 Interfaces of the Iu UP protocol layer in Transparent mode . 14g35.2 Iu UP Protocol layer Services in Transparent
17、mode . 14g35.3 Services Expected from the UP Data Transport layer 14g35.4 Elements for Iu UP communication in Transparent mode . 14g35.4.1 Frame Format for transparent mode 14g36 Support mode for predefined SDU sizes, version 2 . 14g36.1 General . 14g36.1.1 Operation of the Iu UP in Support mode 14g
18、36.1.2 Interfaces of the Iu UP protocol layer in Support mode . 15g36.2 Iu UP Protocol layer Services in Support mode . 15g36.3 Services Expected from the UP Data Transport layer 15g36.4 Functions of the Iu UP Protocol Layer in Support mode . 16g36.4.1 Functional model of the Iu UP Protocol Layer in
19、 Support mode 16g36.4.2 Frame Handler function 16g36.4.3 Procedure Control functions . 16g36.4.4 Non Access Stratum Data Streams specific function(s) 17g36.4.4.1 Frame Quality Classification function 17g36.4.4.1.1 General 17g36.4.4.1.2 Handling of FQC information in uplink path 17g36.4.4.1.3 Handlin
20、g of FQC information in downlink path . 18g36.5 Elementary procedures . 18g36.5.1 Transfer of User Data procedure . 18g36.5.1.1 Successful operation 18g36.5.1.2 Unsuccessful operation . 19g36.5.2 Initialisation procedure . 20g36.5.2.1 Successful operation 20g36.5.2.2 Unsuccessful operation . 22g36.5
21、.3 Iu Rate Control procedure . 22g36.5.3.1 Successful operation 22g36.5.3.2 Unsuccessful operation . 23g36.5.3.2A Frequent Rate Control Procedures 24g36.5.4 Time Alignment procedure . 25g3ETSI ETSI TS 125 415 V14.0.0 (2017-04)43GPP TS 25.415 version 14.0.0 Release 146.5.4.1 Successful operation 25g3
22、6.5.4.2 Unsuccessful operation . 26g36.5.5 Handling of Error Event procedure . 27g36.5.5.1 Successful operation 27g36.5.5.2 Unsuccessful operation . 27g36.5.6 Frame Quality Classification procedure . 28g36.6 Elements for Iu UP communication in Support mode 28g36.6.1 General 28g36.6.2 Frame Format fo
23、r predefined size SDUs 29g36.6.2.1 PDU Type 0 29g36.6.2.2 PDU Type 1 30g36.6.2.3 PDU Type 14 31g36.6.2.3.1 General 31g36.6.2.3.2 Positive Acknowledgement . 32g36.6.2.3.3 Negative Acknowledgement 33g36.6.2.3.4 Procedures Coding. 34g36.6.3 Coding of information elements in frames . 37g36.6.3.1 PDU Typ
24、e . 37g36.6.3.2 Ack/Nack 37g36.6.3.3 Frame Number 38g36.6.3.4 PDU Type 14 Frame Number . 38g36.6.3.5 Frame Quality Classification (FQC) . 38g36.6.3.6 RAB sub-Flow Combination Indicator (RFCI) . 39g36.6.3.7 Procedure Indicator . 39g36.6.3.8 Header CRC 39g36.6.3.9 Payload CRC . 39g36.6.3.10 Chain Indi
25、cator 39g36.6.3.11 Number of Subflows per RFCI . 39g36.6.3.12 Length Indicator (LI). 39g36.6.3.13 Number of RFCI Indicators 40g36.6.3.14 RFCI n Indicator . 40g36.6.3.15 Error distance 40g36.6.3.16 Error Cause value 40g36.6.3.17 Padding . 41g36.6.3.18 Time alignment . 41g36.6.3.19 Spare . 41g36.6.3.2
26、0 Spare extension . 41g36.6.3.21 LRI, Last RFCI Indicator 41g36.6.3.22 Length of subflow . 42g36.6.3.23 TI . 42g36.6.3.24 IPTI of nthRFCI 42g36.6.3.25 Iu UP Mode versions supported 42g36.6.3.26 Iu UP Mode Version . 42g36.6.3.27 Payload fields 42g36.6.3.28 Data PDU type 43g36.6.4 Timers . 43g36.6.5 M
27、aximum values of repetition counters 43g36.7 Handling of unknown, unforeseen and erroneous protocol data 43g36.7.1 General 43g36.7.2 Error detected by Iu UP functions 44g36.7.3 Request by upper layers 44g36.7.4 Error event frame over the Iu UP protocol . 44g36.7.5 Handling of error reports 44g36.7.5
28、.1 General 44g36.7.5.2 Error distance 45g36.7.6 List of errors in Iu UP . 46g36.7.7 Error detection 47g36.7.7.1 General 47g36.7.7.2 CRC Calculation . 47g36.7.7.3 Relation between input and output of the Cyclic Redundancy Check 48g37 Communication Primitives for the Iu UP protocol layer 48g3ETSI ETSI
29、 TS 125 415 V14.0.0 (2017-04)53GPP TS 25.415 version 14.0.0 Release 147.1 Modelling Principle 48g37.2 Primitives towards the upper layers at the RNL SAP . 48g37.2.1 General 48g37.2.2 Iu-UP-DATA-REQUEST . 49g37.2.3 Iu-UP-DATA-INDICATION . 50g37.2.4 Iu-UP-STATUS-REQUEST . 50g37.2.5 Iu-UP-STATUS-INDICA
30、TION . 50g37.2.6 Iu-UP-UNIT-DATA-REQUEST 50g37.2.7 Iu-UP-UNIT-DATA-INDICATION . 50g37.3 Primitives towards the transport layers at TNL SAP 50g37.3.1 General 50g37.3.2 ATM/AAL2 based Transport layer . 50g37.3.2.1 General 50g37.3.2.2 AAL2 Service Primitives used by the Iu UP protocol 51g37.3.3 GTP-U b
31、ased Transport Layer 51g37.3.3.1 General 51g37.3.3.2 Generic Service Primitives used by the Iu UP protocol 51g37.3.4 RTP based Transport Layer 51g37.3.4.1 General 51g37.3.4.2 Generic Service Primitives used by the Iu UP protocol 51g38 Evolution of Iu UP Protocol . 52g38.1 Principles for Protocol Evo
32、lution . 52g38.1.1 Unknown field value . 52g38.1.2 Adding a new field to an existing frame . 53g38.1.3 Adding a new PDU type . 53g38.1.4 Protocol version handling . 53g3Annex A (informative): Illustration of usage of RFCI for AMR speech RAB 55g3Annex B (informative): Illustration of protocol states
33、in the Iu UP 58g3B.1 Protocol state model for transparent mode . 58g3B.1.1 Null State 58g3B.1.2 Transparent Mode Data Transfer Ready State 58g3B.2 Protocol state model for support mode for predefined SDU sizes . 59g3B.2.1 Null State 59g3B.2.2 Initialisation State . 59g3B.2.3 Support Mode Data Transf
34、er Ready State 60g3Annex C (informative): Open Issues of the Iu UP . 61g3Annex D (informative): Distributed rate decision within RNC 62g3Annex E (informative): Change History 63g3History 64g3ETSI ETSI TS 125 415 V14.0.0 (2017-04)63GPP TS 25.415 version 14.0.0 Release 14Foreword This Technical Specif
35、ication (TS) 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 present document, it will be re-released by the T
36、SG 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 change control. y the second digit is incremente
37、d 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 125 415 V14.0.0 (2017-04)73GPP TS 25.415 version 14.0.0 Release 141 Scope The present document def
38、ines the Radio Network Layer user plane protocol being used over the Iu interface. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. uni25CF References are either specific (identified by date of publication,
39、edition number, version number, etc.) or non-specific. uni25CF For a specific reference, subsequent revisions do not apply. uni25CF 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
40、refers to the latest version of that document in the same Release as the present document. 1 3GPP TS 25.401: “UTRAN Overall Description“. 2 3GPP TS 25.410: “UTRAN Iu interface: General Aspects and Principles“. 3 3GPP TS 25.413: “UTRAN Iu interface RANAP Signalling“. 4 3GPP TS 25.414: “UTRAN Iu Inter
41、face Data Transport and Transport Signalling“. 5 3GPP TS 23.110: “UMTS Access Stratum Services and Functions“. 6 Void 7 ITU-T Recommendation I.363.2 (2000-11): “B-ISDN ATM Adaptation Layer specification: Type 2 AAL“. 8 ITU-T Recommendation I.366.1 (1998-06): “Segmentation and reassembly service spec
42、ific convergence sublayer for the AAL type 2“. 9 3GPP TR 21.905: “Vocabulary for 3GPP Specifications“. 10 3GPP TS 25.321: “Medium Access Control (MAC) protocol specification“. 11 3GPP TS 25.322: “Radio Link Control (RLC) protocol specification“. 12 3GPP TS 26.102: “Mandatory speech codec; AMR speech
43、 codec; Interface to Iu and Uu“. 13 3GPP TS 23.153: “Out of Band Transcoder Control; Stage 2“. 14 IETF RFC 1889 (1996-01): “RTP: A Transport Protocol for Real Time Applications“. 15 IETF RFC 1890 (1996-01): “RTP Profile for Audio and Video Conferences with Minimal Control“. ETSI ETSI TS 125 415 V14.
44、0.0 (2017-04)83GPP TS 25.415 version 14.0.0 Release 143 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply. Iu Timing Interval (ITI): Iu Timing Interval is the minimum time interval between sent Iu UP PDUs for a specific
45、RAB. The ITI can be calculated for conversational and streaming traffic classes by the following formula: Inter PDU Transmission Interval (IPTI): inter PDU Transmission Interval is the actual interval at which Iu UP PDUs can be sent at a certain time for a specific RAB subflow combination. The IPTI
46、of a RAB subflow combination is calculated based on the RAB subflow combination size and the RAB subflow combination bitrate by dividing the RAB subflow combination size with the RAB subflow combination bitrate. NOTE: If RFC_Bitrate is not defined then IPTI=ITI. If RFC_size is not defined then RFC_s
47、ize=MaxSDUsize. Non Access Stratum (NAS) Data Streams: non Access Stratum Data Streams is a generic term to identify these data streams exchanged at the Dedicated Service Access Points between the Non Access Stratum and the Access Stratum. RAB sub-flows: RAB as defined in TR 21.905 9 is realised by
48、UTRAN through one to several sub-flows. These sub-flows correspond to the NAS service data streams that have QoS characteristics that differ in a predefined manner within a RAB e.g. different reliability classes. RAB sub-flows characteristics: 1) the sub-flows of a RAB are established and released t
49、ogether at the RAB establishment and release, respectively; 2) the sub-flows of a RAB are submitted and delivered together at the RAB SAP; 3) the sub-flows of a RAB are carried over the same Iu transmission connection; 4) the sub-flows of a RAB are organised in a predefined manner at the RAB SAP and over the Iu interface. The organisation is imposed by the NAS as part of its co-ordination responsibility. RAB sub-flows numbering (applies to support mode for predefined SDU size only): 1) RAB sub-flows are numbered from 1 to N (N is the number of
