1、 ETSI TS 126 202 V14.0.0 (2017-05) Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; Speech codec speech processing functions; Adaptive Multi-Rate - Wideband (AMR-WB) speech codec; Interface to Iu, Uu and Nb (3GPP TS 26.202 version 1
2、4.0.0 Release 14) TECHNICAL SPECIFICATION ETSI ETSI TS 126 202 V14.0.0 (2017-05)13GPP TS 26.202 version 14.0.0 Release 14Reference RTS/TSGS-0426202ve00 Keywords GSM,LTE,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
3、 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 present document may be made available in electronic versions and/or in print. The conte
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9、ected for the benefit of its Members GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 126 202 V14.0.0 (2017-05)23GPP TS 26.202 version 14.0.0 Release 14Intellectual Property Rights IPRs essential or potentially essential to the present document may have
10、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 Essential, IPRs notified to ETSI in respect of ETSI standard
11、s“, 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 carried out by ETSI. No guarantee can be given as to the existence of other IPRs not refer
12、enced 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 Generation Partnership Project (3GPP). The present document may refer to technical specifi
13、cations 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, 3GPP and ETSI identities can be found under http:/webapp.etsi.org/key/queryform.asp. Modal
14、 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 provisions). “must“ and “must not“ are NO
15、T allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TS 126 202 V14.0.0 (2017-05)33GPP TS 26.202 version 14.0.0 Release 14Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 Definitions and abbreviation
16、s . 5g33.1 Definitions 5g33.2 Abbreviations . 5g34 General . 6g35 RAB aspects . 6g36 Iu Interface User Plane (RAN) . 8g36.1 Frame structure on the Iu UP transport protocol 8g36.1.1 Initialisation 8g36.1.2 Time Alignment Procedure . 8g36.2 Mapping of the bits. 8g36.3 Frame handlers . 9g36.3.1 Handlin
17、g of frames from TC to Iu interface (downlink) . 10g36.3.1.1 Frame Quality Indicator 10g36.3.1.2 Frame Type . 10g36.3.1.3 Codec Mode Indication . 10g36.3.1.4 Codec Mode Request 10g36.3.1.5 Optional internal 8 bits CRC . 10g36.3.1.6 Mapping of Speech or Comfort Noise parameter bits . 10g36.3.2 Handli
18、ng of frames from Iu interface to TC (uplink) . 11g36.3.2.1 Frame Quality Indicator 11g36.3.2.2 Frame Type . 11g36.3.2.3 Codec Mode Indication . 11g36.3.2.4 Codec Mode Request 11g36.3.2.5 Optional internal 8 bits CRC . 11g36.3.2.6 Speech and Comfort noise parameter bits . 11g37 Uu Interface User Pla
19、ne (UE) 11g38 Nb Interface User Plane (CN) 12g38.1 Frame structure on the Nb UP transport protocol . 12g38.1.1 Initialisation 12g38.1.2 Time Alignment Procedure . 12g38.2 Mapping of the bits. 12g38.2.1 Mapping for AMR-WB frames . 12g38.2.2 Mapping for PCM Coded Speech . 12g38.3 Frame handlers . 13g3
20、Annex A (informative): Change history . 13g3History 14g3ETSI ETSI TS 126 202 V14.0.0 (2017-05)43GPP TS 26.202 version 14.0.0 Release 14Foreword This Technical Specification (TS) has been produced by the 3rdGeneration Partnership Project (3GPP). The contents of the present document are subject to con
21、tinuing 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.y.z where: x the first digit: 1 p
22、resented 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
23、 only changes have been incorporated in the document. ETSI ETSI TS 126 202 V14.0.0 (2017-05)53GPP TS 26.202 version 14.0.0 Release 141 Scope The present document specifies the mapping of the AMR wideband generic frame format (3GPP TS 26.201) to the Iu Interface (3GPP TS 25.415), the Uu Interface and
24、 the Nb Interface (3GPP TS 29.415) of a BICC-based circuit switched core network. It further specifies the mapping of PCM 64 kBit/s (ITU-T G.711) coded speech to the Nb Interface of a BICC-based circuit switched core network. The mapping of the AMR wideband generic frame format to RTP for the A-Inte
25、rface and the Nb Interface for a SIP-I -based circuit switched core network is described in TS 26.102. 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
26、 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), a non-specific reference implicitl
27、y refers to the latest version of that document in the same Release as the present document. 1 3GPP TS 25.415: “Iu Interface CN-UTRAN User plane Protocols“. 2 3GPP TS 26.201: “AMR Wideband Speech Codec, Frame structure“. 3 3GPP TS 23.107: “QoS Concept and Architecture“. 5 3GPP TS 28.062: “ In-band T
28、andem Free Operation (TFO) of Speech Codecs, Stage 3“. 6 3GPP TS 23.153: “Out of band transcoder control, Stage 2“. 6 3GPP TS 29.415: “Core Network Nb Interface User Plane Protocols“. 7 ITU-T I.366.2: “AAL type 2 service specific convergence sublayer for trunking“. 3 Definitions and abbreviations 3.
29、1 Definitions For the purposes of the present document the following terms and definitions apply: AMR Wideband Generic Frame Interface: this interface transports the AMR-WB IF1 generic frame as defined in 3GPP TS 26.201. 3.2 Abbreviations For the purposes of the present document, the following abbre
30、viations apply: AAL2 ATM Adaptation Layer 2 ACS Active Codec Set AMR Adaptive Multi-Rate AS Access Stratum ATM Asynchronous Transfer Mode ETSI ETSI TS 126 202 V14.0.0 (2017-05)63GPP TS 26.202 version 14.0.0 Release 14BFH Bad Frame Handling CMR/CMC Codec Mode Request or Codec Mode Command CMI Codec M
31、ode Indication CN Core Network CDMA Code Division Multiple Access DRC Downlink Rate Command FDD Frequency Duplex Division FQC Frame Quality Classification (Iu Interface) FQI Frame Quality Indication (AMR-WBIF1) GSM Global System for Mobile communications ITU-T International Telecommunication Union T
32、elecommunication standardisation sector (former CCITT) MAC Media Access Control MGW Media GateWay PCM Pulse Code Modulation, synonym for 64 kBit/s coded speech (see ITU-T G.711) PLMN Public Land Mobile Network QoS Quality of Service RAN Radio Access Network RAB Radio Access Bearer RF Radio Frequency
33、 RFC RAB sub-flow Combination RFCI RFC IndicatorRFCS RFC Set RX ReceiveSCR Source Controlled Rate SDU Source Data Unit SID Silence Insertion Descriptor SMpSDU Support Mode for Predefined SDU sizes SPD SPeech Decoder SPE SPeech Encoder TC Transcoder TDD Time Duplex Division TDMA Time Division Multipl
34、e Access TFO Tandem Free Operation TrFO Transcoder Free Operation TX Transmit UE User Equipment (terminal) URC Uplink Rate Command 4 General The mapping of the AMR-WB Speech Codec parameters to the Iu interface specifies the frame structure of the speech data exchanged between the RNC and the TC in
35、case of normal operation and Tandem Free Operation, respectively between RNC 1 and RNC 2 in case of Transcoder Free Operation. This mapping is independent from the radio interface in the sense that it has the same structure for both FDD and TDD modes of the UTRAN. The mapping between the Speech Code
36、c and the Radio Access Network within the UE is not an open interface and need not to be detailed. The mapping on the Nb Interface is identical to the one on the Iu Interface in case of Transcoder Free Operation, with the MGW relaying the SDUs unaltered between Iu and Nb Interfaces. In case of trans
37、coding within the MGW the PCM coded speech is mapped onto the Nb Interface in packets of 40 octets. 5 RAB aspects During the RAB Assignment procedure initiated by the CN to establish the RAB for UMTS_AMR-WB, the RAB parameters are defined. The UMTS_AMR-WB RAB is established with one or more RAB co-o
38、rdinated sub-flows with predefined sizes and QoS parameters. In this way, each Transport Format Combination between sub-flows corresponds ETSI ETSI TS 126 202 V14.0.0 (2017-05)73GPP TS 26.202 version 14.0.0 Release 14to one UMTS_AMR-WB frame type. On the Iu interface, these RAB parameters define the
39、 corresponding parameters regarding the transport of UMTS_AMR-WB frames. Some of the QoS parameters in the RAB assignment procedure are determined from the Bearer Capability Information Element used at call set up. These QoS parameters as defined in 3, can be set as follows: Table 5-1: Example of ma
40、pping of BC IE into QoS parameters for UMTS_AMR-WB RAB service attribute RAB service attribute value Comments Traffic Class Conversational RAB Asymmetry Indicator Symmetric, bidirectional Symmetric RABs are used for uplink and downlink Maximum bit rate 12,65 kbit/s in configurations 0 and 1 15,85 kb
41、it/s in configurations 2 and 3 23,85 kbit/s in configurations 4 and 5 This value depends on the highest mode rate in the RFCS (note 2) Guaranteed bit rate 6,60 kbit/s One of the values is chosen, depending on the lowest rate controllable SDU format (note 2) Delivery Order Yes (note 1) Maximum SDU si
42、ze 253 in configurations 0 and 1 317 in configurations 2 and 3 477 in configurations 4 and 5 Maximum size of payload field in Iu UP, according to the highest mode rate in the RFCS (note 2) Traffic Handling Priority Not applicable Parameter not applicable for the conversational traffic class. (note 1
43、) Source statistics descriptor Speech (note 1) SDU Parameters RAB subflow 1 (Class A bits) RAB subflow 2 (Class B bits) The number of SDU, their number of RAB subflow is subject to operator tuning (note 3) SDU error ratio 7 * 10-3- (note 3) Residual bit error ratio 10-610-3(note 3 applicable for eve
44、ry subflow) Delivery of erroneous SDUs yes - Class A bits are delivered with error indication; Class B bits are delivered without any error indication. SDU format information 1-5 (note 4) sub-flow SDU size 1-5 (note 5) (note 5) NOTE 1: These parameters apply to all UMTS speech codec types. NOTE 2: T
45、he guaranteed bit rate depends on the periodicity and the lowest rate controllable SDU size. All UMTS_AMR-WB configurations as defined in TS 26.103 contain the 6,60 kbps codec mode as lowest and therefore “guaranteed bit rate”. The “maximum bit rate” and the “maximum SDU size” depend on the selected
46、 UMTS_AMR-WB configuration. NOTE 3: These parameters are subject to operator tuning. NOTE 4: SDU format information has to be specified for each AMR-WBcore frame type (i.e. with speech bits and comfort noise bits) included in the RFCS as defined in 2. NOTE 5: The subflow SDU size corresponding to an
47、 AMR-WBcore frame type indicates the number of bits in the class A, class B fields. The conversational traffic class shall be used for the speech service, which is identified by the ITC parameter of the bearer capability information element in the SETUP message. This shall apply for all UMTS speech
48、codec types. The parameters traffic class, transfer delay, traffic handling priority and source statistics descriptor shall be the same for all speech codec types applicable for UMTS. ETSI ETSI TS 126 202 V14.0.0 (2017-05)83GPP TS 26.202 version 14.0.0 Release 146 Iu Interface User Plane (RAN) The d
49、ata structures exchanged on the Iu interface are symmetrical, i.e. the structure of the uplink data frames is identical to that of the downlink data frames. This facilitates Tandem Free Operation and Transcoder Free Operation. 6.1 Frame structure on the Iu UP transport protocol 6.1.1 Initialisation At the initialisation of the SMpSDU mode of operation, several parameters are set by the CN. The initialisation procedure is described in 3GPP TS 25.415 1. - RFCS: In the case of UMTS_AMR-WB, the RFCS corresponds to the Active Codec Set (ACS) plus SCR autho
