1、 ETSI TS 125 415 V15.0.0 (2018-07) Universal Mobile Telecommunications System (UMTS); UTRAN Iu interface user plane protocols (3GPP TS 25.415 version 15.0.0 Release 15) TECHNICAL SPECIFICATION ETSI ETSI TS 125 415 V15.0.0 (2018-07)13GPP TS 25.415 version 15.0.0 Release 15Reference RTS/TSGR-0325415vf
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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13、cument does not constitute an endorsement by ETSI of products, 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 rep
14、orts 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, 3GPP and ETSI identities can be found under http:/webapp.etsi.org/key/queryform.asp. Modal verbs termino
15、logy 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 provisions). “must“ and “must not“ are NOT allowed in E
16、TSI deliverables except when used in direct citation. ETSI ETSI TS 125 415 V15.0.0 (2018-07)33GPP TS 25.415 version 15.0.0 Release 15Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 6g31 Scope 7g32 References 7g33 Definitions and abbreviations . 7g33.1 Def
17、initions 7g33.2 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 of operation . 11g34.2.2 Transparent mode (TrM) 11g34.2.3 Support mode 12g35 Transparent mode, versio
18、n 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 . 13g35.2 Iu UP Protocol layer Services in Transparent mode . 13g35.3 Services Expected from the UP Data Transport layer 13g35.4 Elements for Iu UP communic
19、ation in Transparent mode . 13g35.4.1 Frame Format for transparent mode 13g36 Support mode for predefined SDU sizes, version 2 . 14g36.1 General . 14g36.1.1 Operation of the Iu UP in Support mode 14g36.1.2 Interfaces of the Iu UP protocol layer in Support mode . 14g36.2 Iu UP Protocol layer Services
20、 in Support mode . 14g36.3 Services Expected from the UP Data Transport layer 14g36.4 Functions of the Iu UP Protocol Layer in Support mode . 15g36.4.1 Functional model of the Iu UP Protocol Layer in Support mode 15g36.4.2 Frame Handler function 15g36.4.3 Procedure Control functions . 15g36.4.4 Non
21、Access Stratum Data Streams specific function(s) 16g36.4.4.1 Frame Quality Classification function 16g36.4.4.1.1 General 16g36.4.4.1.2 Handling of FQC information in uplink path 16g36.4.4.1.3 Handling of FQC information in downlink path . 17g36.5 Elementary procedures . 17g36.5.1 Transfer of User Da
22、ta procedure . 17g36.5.1.1 Successful operation 17g36.5.1.2 Unsuccessful operation . 18g36.5.2 Initialisation procedure . 19g36.5.2.1 Successful operation 19g36.5.2.2 Unsuccessful operation . 21g36.5.3 Iu Rate Control procedure . 21g36.5.3.1 Successful operation 21g36.5.3.2 Unsuccessful operation .
23、22g36.5.3.2A Frequent Rate Control Procedures 23g36.5.4 Time Alignment procedure . 24g36.5.4.1 Successful operation 24g3ETSI ETSI TS 125 415 V15.0.0 (2018-07)43GPP TS 25.415 version 15.0.0 Release 156.5.4.2 Unsuccessful operation . 25g36.5.5 Handling of Error Event procedure . 26g36.5.5.1 Successful
24、 operation 26g36.5.5.2 Unsuccessful operation . 26g36.5.6 Frame Quality Classification procedure . 27g36.6 Elements for Iu UP communication in Support mode 27g36.6.1 General 27g36.6.2 Frame Format for predefined size SDUs 28g36.6.2.1 PDU Type 0 28g36.6.2.2 PDU Type 1 29g36.6.2.3 PDU Type 14 29g36.6.
25、2.3.1 General 29g36.6.2.3.2 Positive Acknowledgement . 30g36.6.2.3.3 Negative Acknowledgement 31g36.6.2.3.4 Procedures Coding. 31g36.6.3 Coding of information elements in frames . 35g36.6.3.1 PDU Type . 35g36.6.3.2 Ack/Nack 35g36.6.3.3 Frame Number 36g36.6.3.4 PDU Type 14 Frame Number . 36g36.6.3.5
26、Frame Quality Classification (FQC) . 36g36.6.3.6 RAB sub-Flow Combination Indicator (RFCI) . 37g36.6.3.7 Procedure Indicator . 37g36.6.3.8 Header CRC 37g36.6.3.9 Payload CRC . 37g36.6.3.10 Chain Indicator 37g36.6.3.11 Number of Subflows per RFCI . 37g36.6.3.12 Length Indicator (LI). 37g36.6.3.13 Num
27、ber of RFCI Indicators 37g36.6.3.14 RFCI n Indicator . 38g36.6.3.15 Error distance 38g36.6.3.16 Error Cause value 38g36.6.3.17 Padding . 39g36.6.3.18 Time alignment . 39g36.6.3.19 Spare . 39g36.6.3.20 Spare extension . 39g36.6.3.21 LRI, Last RFCI Indicator 39g36.6.3.22 Length of subflow . 39g36.6.3.
28、23 TI . 40g36.6.3.24 IPTI of nthRFCI 40g36.6.3.25 Iu UP Mode versions supported 40g36.6.3.26 Iu UP Mode Version . 40g36.6.3.27 Payload fields 40g36.6.3.28 Data PDU type 41g36.6.4 Timers . 41g36.6.5 Maximum values of repetition counters 41g36.7 Handling of unknown, unforeseen and erroneous protocol d
29、ata 41g36.7.1 General 41g36.7.2 Error detected by Iu UP functions 42g36.7.3 Request by upper layers 42g36.7.4 Error event frame over the Iu UP protocol . 42g36.7.5 Handling of error reports 42g36.7.5.1 General 42g36.7.5.2 Error distance 43g36.7.6 List of errors in Iu UP . 43g36.7.7 Error detection 4
30、5g36.7.7.1 General 45g36.7.7.2 CRC Calculation . 45g36.7.7.3 Relation between input and output of the Cyclic Redundancy Check 45g37 Communication Primitives for the Iu UP protocol layer 45g37.1 Modelling Principle 45g3ETSI ETSI TS 125 415 V15.0.0 (2018-07)53GPP TS 25.415 version 15.0.0 Release 157.2
31、 Primitives towards the upper layers at the RNL SAP . 46g37.2.1 General 46g37.2.2 Iu-UP-DATA-REQUEST . 47g37.2.3 Iu-UP-DATA-INDICATION . 47g37.2.4 Iu-UP-STATUS-REQUEST . 47g37.2.5 Iu-UP-STATUS-INDICATION . 47g37.2.6 Iu-UP-UNIT-DATA-REQUEST 47g37.2.7 Iu-UP-UNIT-DATA-INDICATION . 47g37.3 Primitives to
32、wards the transport layers at TNL SAP 47g37.3.1 General 47g37.3.2 ATM/AAL2 based Transport layer . 48g37.3.2.1 General 48g37.3.2.2 AAL2 Service Primitives used by the Iu UP protocol 48g37.3.3 GTP-U based Transport Layer 48g37.3.3.1 General 48g37.3.3.2 Generic Service Primitives used by the Iu UP pro
33、tocol 48g37.3.4 RTP based Transport Layer 49g37.3.4.1 General 49g37.3.4.2 Generic Service Primitives used by the Iu UP protocol 49g38 Evolution of Iu UP Protocol . 49g38.1 Principles for Protocol Evolution . 49g38.1.1 Unknown field value . 49g38.1.2 Adding a new field to an existing frame . 50g38.1.
34、3 Adding a new PDU type . 50g38.1.4 Protocol version handling . 51g3Annex A (informative): Illustration of usage of RFCI for AMR speech RAB 52g3Annex B (informative): Illustration of protocol states in the Iu UP 55g3B.1 Protocol state model for transparent mode . 55g3B.1.1 Null State 55g3B.1.2 Trans
35、parent Mode Data Transfer Ready State 55g3B.2 Protocol state model for support mode for predefined SDU sizes . 55g3B.2.1 Null State 56g3B.2.2 Initialisation State . 56g3B.2.3 Support Mode Data Transfer Ready State 57g3Annex C (informative): Open Issues of the Iu UP . 58g3Annex D (informative): Distr
36、ibuted rate decision within RNC 59g3Annex E (informative): Change History 60g3History 61g3ETSI ETSI TS 125 415 V15.0.0 (2018-07)63GPP TS 25.415 version 15.0.0 Release 15Foreword This Technical Specification (TS) has been produced by the 3rdGeneration Partnership Project (3GPP). The contents of the p
37、resent 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 change of release date and an increase in version number as follows: Version x
38、.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 substance, i.e. technical enhancements, corrections, updates, etc. z the third d
39、igit is incremented when editorial only changes have been incorporated in the document. ETSI ETSI TS 125 415 V15.0.0 (2018-07)73GPP TS 25.415 version 15.0.0 Release 151 Scope The present document defines the Radio Network Layer user plane protocol being used over the Iu interface. 2 References The f
40、ollowing documents contain provisions which, through reference in this text, constitute provisions of the present document. g404 References are either specific (identified by date of publication, edition number, version number, etc.) or non-specific. g404 For a specific reference, subsequent revisio
41、ns do not apply. g404 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 TS 25.401: “
42、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 Interface Data Transport and Transport Signalling“. 5 3GPP TS 23.110: “UMTS Access Stratum Services and Functions“.
43、 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 specific convergence sublayer for the AAL type 2“. 9 3GPP TR 21.905: “Vocabulary for 3GPP Specifications“. 10 3GPP
44、 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 codec; Interface to Iu and Uu“. 13 3GPP TS 23.153: “Out of Band Transcoder Control; Stage 2“. 14 IETF RFC 188
45、9 (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“. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply. Iu
46、 Timing Interval (ITI): Iu Timing Interval is the minimum time interval between sent Iu UP PDUs for a specific RAB. The ITI can be calculated for conversational and streaming traffic classes by the following formula: MaxBitrateMaxSDUsizeITI =ETSI ETSI TS 125 415 V15.0.0 (2018-07)83GPP TS 25.415 vers
47、ion 15.0.0 Release 15Inter 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 of a RAB subflow combination is calculated based on the RAB subflow combination size
48、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_size=MaxSDUsize. Non Access Stratum (NAS) Data Streams: non Access Stratum Data Stream
49、s 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 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 together at the RAB establishment and
