1、 ETSI TS 1Digital cellular telecoUniversal Mobile TelSpeech codec sAdaptive Multi-Rate - Interfa(3GPP TS 26.2TECHNICAL SPECIFICATION126 202 V13.0.0 (2016communications system (Phaelecommunications System (LTE; c speech processing functionWideband (AMR-WB) speecrface to Iu, Uu and Nb .202 version 13.
2、0.0 Release 1316-01) hase 2+); (UMTS); ons; ech codec; 13) ETSI ETSI TS 126 202 V13.0.0 (2016-01)13GPP TS 26.202 version 13.0.0 Release 13Reference RTS/TSGS-0426202vd00 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
3、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 present document may be made available in electronic versions and/or in
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9、GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 126 202 V13.0.0 (2016-01)23GPP TS 26.202 version 13.0.0 Release 13Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining
10、 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 standards“, which is available from the ETSI Secretariat.
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12、TSI 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 specifications or reports using their 3GPP identities, U
13、MTS 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 terminology In the present document “shall
14、“, “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 ETSI deliverables except when used i
15、n direct citation. ETSI ETSI TS 126 202 V13.0.0 (2016-01)33GPP TS 26.202 version 13.0.0 Release 13Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 4g31 Scope 5g32 References 5g33 Definitions and abbreviations . 5g33.1 Definitions 5g33.2 Abbreviations . 5g3
16、4 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 Handling of frames from TC to Iu interface (downlink) .
17、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 Handling of frames from Iu interface to TC (uplink) . 1
18、1g36.3.2.1 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 Plane (UE) 11g38 Nb Interface User Plane (CN) 12g38.
19、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 . 12g3Annex A (informative): Change history . 13g3Histo
20、ry 14g3ETSI ETSI TS 126 202 V13.0.0 (2016-01)43GPP TS 26.202 version 13.0.0 Release 13Foreword This Technical Specification (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 follow
21、ing 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 to TSG for information; 2 presented to T
22、SG 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 changes have been incorporated in the docum
23、ent. ETSI ETSI TS 126 202 V13.0.0 (2016-01)53GPP TS 26.202 version 13.0.0 Release 131 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 the Nb Interface (3GPP TS 29.415) of a BICC-base
24、d 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-Interface and the Nb Interface for a SIP-I -based cir
25、cuit 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 publication, edition number, version number, etc.)
26、 or non-specific. For a specific reference, subsequent revisions do not apply. For a non-specific reference, the latest version applies. 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
27、Architecture“. 5 3GPP TS 28.062: “ In-band Tandem 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 t
28、runking“. 3 Definitions and abbreviations 3.1 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
29、of the present document, the following abbreviations apply: AAL2 ATM Adaptation Layer 2 ACS Active Codec Set AMR Adaptive Multi-Rate AS Access Stratum ATM Asynchronous Transfer Mode BFH Bad Frame Handling ETSI ETSI TS 126 202 V13.0.0 (2016-01)63GPP TS 26.202 version 13.0.0 Release 13CMR/CMC Codec Mo
30、de Request or Codec Mode Command CMI Codec Mode 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 I
31、TU-T International Telecommunication Union Telecommunication 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 Networ
32、k RAB Radio Access Bearer RF Radio Frequency 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 Tim
33、e Duplex Division TDMA Time Division Multiple 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 d
34、ata exchanged between the RNC and the TC in 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 th
35、e UTRAN. The mapping between the Speech Codec 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 be
36、tween Iu and Nb Interfaces. In case of transcoding 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
37、RAB is established with one or more RAB co-ordinated sub-flows with predefined sizes and QoS parameters. In this way, each Transport Format Combination between sub-flows corresponds ETSI ETSI TS 126 202 V13.0.0 (2016-01)73GPP TS 26.202 version 13.0.0 Release 13to one UMTS_AMR-WB frame type. On the I
38、u interface, these RAB parameters define the 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
39、 be set as follows: Table 5-1: Example of mapping 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,
40、65 kbit/s in configurations 0 and 1 15,85 kbit/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
41、) Delivery Order Yes (note 1) Maximum SDU size 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 f
42、or the conversational traffic class. (note 1) 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 er
43、ror ratio 10-610-3(note 3 applicable for every 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 app
44、ly to all UMTS speech codec types. NOTE 2: The 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 m
45、aximum SDU size depend on the selected 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: Th
46、e subflow SDU size corresponding to an 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.
47、 This shall apply for all UMTS speech 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 V13.0.0 (2016-01)83GPP TS 26.202 version 13.0.0 Release 1
48、36 Iu Interface User Plane (RAN) The data 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 tr
49、ansport 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 authorised in the communication. Annex A of 1 gives an illustration of the usage of RFCI for UMTS_AMR-WB speech RAB. RFCS used in downlink may differ from that in uplink. - Delivery of erroneous SDUs: This parameter shall be set to YES. Erroneous speech
