1、 ETSI TS 148 020 V14.0.0 (2017-04) Digital cellular telecommunications system (Phase 2+) (GSM); Rate adaption on the Base Station System - Mobile-services Switching Centre (BSS - MSC) interface (3GPP TS 48.020 version 14.0.0 Release 14) TECHNICAL SPECIFICATION GLOBAL SYSTEM FOR MOBILE COMMUNICATIONS
2、RETSI ETSI TS 148 020 V14.0.0 (2017-04)13GPP TS 48.020 version 14.0.0 Release 14Reference RTS/TSGC-0348020ve00 Keywords GSM 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 luc
3、ratif 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 content of any electronic and/or print versions of the
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9、Association. ETSI ETSI TS 148 020 V14.0.0 (2017-04)23GPP TS 48.020 version 14.0.0 Release 14Intellectual Property 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 f
10、or 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. Latest updates are available on the ETSI Web server (htt
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12、ntial 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, UMTS identities or GSM identities. These should be interpr
13、eted 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“, “should not“, “may“, “need not“
14、, “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 ETSI TS 148 020 V14.0.0 (2017-04)
15、33GPP TS 48.020 version 14.0.0 Release 14Contents Intellectual Property Rights 2g3Foreword . 2g3Modal verbs terminology 2g3Foreword . 5g31 Scope 6g32 References, abbreviations and definitions 6g32.1 References 6g32.2 Abbreviations . 7g32.3 Definitions 7g33 General approach 7g34 The RA0 Function 7g35
16、 The RA1 Function 7g35a The RA1 Function . 8g36 The RA1 Function . 8g36.1 Rate adaptation of 48 kbit/s user rates with DTE/DCE status to 64 kbit/s . 9g36.2 Rate adaptation of 56 kbit/s user rate to 64 kbit/s 9g37 Split/Combine and Padding Functions . 9g37.1 Data Frame distribution into the channels
17、by the Split/Combine function . 9g37.2 Substream numbering . 9g37.3 Initial Substream Synchronisation for Transparent Services 9g37.4 Frame Synchronisation and Action on loss of Synchronisation . 9g37.5 Network Independent Clocking 9g37.6 Padding . 9g38 The EDGE Multiplexing Function . 10g38.1 Trans
18、parent services . 10g38.2 Non-Transparent services . 10g39 The Functions RA1/RA1 and RA1/RA1” 11g39.1 Radio Interface rate of 12 kbit/s . 11g39.2 Radio Interface rate of 6 kbit/s . 11g39.3 Radio Interface rate of 3.6 kbit/s 11g39.4 Synchronisation 11g39.5 Idle frames 11g310 The Functions RA1/RAA and
19、 RA1/RAA” 12g310.1 Radio Interface rate of 14,5 kbit/s 12g310.2 Synchronisation 12g310.3 Idle frames 12g311 THE RAA FUNCTION . 12g311.1 Coding of A-TRAU frame 12g311.2 Framing Pattern Substitution in A-TRAU frame 13g311.2.1 FPS encoding 13g311.3 A-TRAU Synchronisation Pattern 15g312 THE RAA FUNCTION
20、 15g312a The RAE Function . 16g313 The RA2 Function 16g314 The A-interface Multiplexing Function . 17g315 Support of non-transparent bearer services in A/Gb mode 17g3ETSI ETSI TS 148 020 V14.0.0 (2017-04)43GPP TS 48.020 version 14.0.0 Release 1415.1 TCH/F9.6 and TCH/F4.8 kbit/s channel codings . 17g
21、315.1.1 Alignment . 18g315.1.2 Support of Discontinuous Transmission (DTX) . 18g315.1.3 Order of Transmission 18g315.2 TCH/F14.4, TCH/F28.8, and TCH/F43.2 channel codings 19g315.2.1 Alignment . 19g315.2.2 Support of Discontinuous Transmission (DTX) . 19g315a Support of non-transparent bearer service
22、s in Iu mode 20g316 Support of transparent bearer services in A/Gb mode 20g316.1 TCH/F9.6 and TCH/F4.8 channel codings . 20g316.1.1 User rate adaptation on the A interface, AIUR less than or equal to 38,4 kbit/s 20g316.1.2 User rate Adaptation on the A-interface, AIUR greater than 38,4 kbit/s 21g316
23、.1.3 Relation between AIUR and the number of channels . 21g316.1.4 Handling of status bits X, SA, SB . 21g316.1.5 Handling of bits E1 to E7 . 21g316.2 TCH/F14.4, TCH/F28.8, and TCH/F32.0 channel codings 22g316.2.1 User rate adaptation on the A interface, AIUR less than or equal to 56 kbit/s . 22g316
24、.2.2 User Rate Adaptation on the A-interface, AIUR greater than 56 kbit/s 22g316.2.3 Relation between AIUR and the number of channels . 22g316.2.4 Handling of status bits X and SB 22g316a Support of transparent bearer services in Iu mode . 23g317 Frame Formats 23g3Annex A (informative): Frame Patter
25、n Substitution 28g3A.1 Special cases . 28g3A.2 False Z sequence detection . 29g3Annex B (informative): Change History 31g3History 32g3ETSI ETSI TS 148 020 V14.0.0 (2017-04)53GPP TS 48.020 version 14.0.0 Release 14Foreword This Technical Specification has been produced by the 3rdGeneration Partnershi
26、p 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 is re-released by the TSG with an identifying change of release date and an increase in ve
27、rsion 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 incremented for all changes of substance, i.e. technical enhancements, correc
28、tions, updates, etc. z the third digit is incremented when editorial only changes have been incorporated in the document. ETSI ETSI TS 148 020 V14.0.0 (2017-04)63GPP TS 48.020 version 14.0.0 Release 141 Scope The present document defines rate adaptation functions to be used in PLMN Base Station Syst
29、ems (BSS) transcoders and IWF - for adapting radio interface data rates to the 64 kbit/s used at the A-interface in A/Gb mode and - for adapting radio interface data rates to the Iu interface in GERAN Iu mode in accordance with 3GPP TS 43.010. The number of Base Station System - Mobile-services Swit
30、ching Centre (BSS - MSC) traffic channels supporting data rate adaptation may be limited. In this case some channels may not support data rate adaptation. Those that do, shall conform to this specification. NOTE: This specification should be considered together with 3GPP TS 44.021 to give a complete
31、 description of PLMN rate adaptation. 2 References, abbreviations and definitions 2.1 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
32、 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 implicitly refers to the latest ve
33、rsion of that document in the same Release as the present document. 1 3GPP TR 21.905: “ Vocabulary for 3GPP specifications “. 2 3GPP TS 22.034: “High Speed Circuit Switched Data (HSCSD) - Stage1“ 3 3GPP TS 43.010: “GSM Public Land Mobile Network (PLMN) connection types“. 4 3GPP TS 23.034: “High Spee
34、d Circuit Switched Data (HSCSD) - Stage2“. 5 3GPP TS 44.021: “Rate adaption on the Mobile Station - Base Station System (MS - BSS) interface“. 6 3GPP TS 24.022: “Radio Link Protocol (RLP) for Circuit Switched Bearer and Teleservices“. 7 3GPP TS 45.003: “Channel coding“. 8 3GPP TS 27.001: “General on
35、 Terminal Adaptation Functions (TAF) for Mobile Stations (MS)“. 9 3GPP TS 48.008: “Mobile Switching Centre - Base Station System (MSC - BSS) interface; Layer 3 specification“. 10 3GPP TS 29.007: “General requirements on interworking between the Public Land Mobile Network (PLMN) and the Integrated Se
36、rvices Digital Network (ISDN) or Public Switched Telephone Network (PSTN)“. 11 ITU-T Recommendation V.110: “Support of data terminal equipments (DTEs) with V-Series interfaces by an integrated services digital network“. 12 ITU-T Recommendation I.460:-Multiplexing, rate adaption and support of existi
37、ng interfaces. ETSI ETSI TS 148 020 V14.0.0 (2017-04)73GPP TS 48.020 version 14.0.0 Release 1413 3GPP TS 48.060: “In-band control of remote transcoders and rate adaptors for full rate traffic channels” 14 3GPP TS 25.415: “UTRAN Iu Interface user plane protocols“. 2.2 Abbreviations For the purposes o
38、f the present document, the following abbreviations apply: FPS Frame Pattern Substitution FSI Frame Start Identifier ZSP Zero Sequence Position 2.3 Definitions For the purposes of the present document, the following terms and definitions apply. Substream: Stream of data with explicit or implicit num
39、bering between splitter and combine functions. Channel: A physical full rate channel on the radio interface (TCH/F) independent of the contents. A interface circuit: The 8 bits that constitute one 64 kbps circuit on the A interface. A interface subcircuit: One specific bit position or one specific p
40、air of bit positions within the A interface circuit. EDGE channel: A general term referring to channels based on 8PSK modulation; i.e. TCH/F28.8, TCH/F32.0, and TCH/F43.2. 3 General approach 3GPP TS 43.010 (clause 6) defines the PLMN connection types necessary to support the data and telematic servi
41、ces in a PLMN operating in A/Gb mode or GERAN Iu mode. Within the BSS , transcoder and IWF, there are several data rate adaptation functions which are combined as shown in 3GPP TS 43.010 as part of a connection type. These functions are RA0, RA1, RA1/RA1 , RA1 , RA1/RA1”, RA1/RAA”, RA1, RAA“, RA1/RA
42、A, RAA , RAE and RA2. The RA2 function is equivalent to that described in ITU-T Recommendation V.110. In addition, splitting/combining, padding and inband numbering functions as defined in 3GPP TS 44.021 and multiplexing as defined herein are used in cases where more than one channel is allowed. The
43、 RA1/RA1, RA1/RA1”, RA1/RAA” and RA1/RAA are relay functions used as indicated in 3GPP TS 43.010. The BSS uses the information contained in the ASSIGNMENT REQUEST message on the A-interface (see 3GPP TS 48.008) to set the “E bits“ and to map the “D bits“ as shown below, as well as to choose the corr
44、ect channel coding. 4 The RA0 Function The RA0 function is specified in 3GPP TS 44.021. 5 The RA1 Function This function shall be used to adapt between the synchronous user rates, or the output of the RA0 function or Split/Combine function and the intermediate rate of 8, 16, 32 or 64 kbit/s. ETSI ET
45、SI TS 148 020 V14.0.0 (2017-04)83GPP TS 48.020 version 14.0.0 Release 14For multislot operations RA1 applies per substream. RA1 applies only if TCH/F4.8 or TCH/F9.6 is used for user rates up to 38,4 kbit/s. The RA1 function is only applicable for A/Gb mode. Synchronous user rate Intermediate rate 2,
46、4 kbit/s 8 kbit/s 4,8 kbit/s 8 kbit/s 9,6 kbit/s 16 kbit/s 14,4 kbit/s 32 kbit/s 19,2 kbit/s 32 kbit/s 28,8 kbit/s 64 kbit/s 38,4 kbit/s 64 kbit/s An ITU-T V.110 80 bits frame is constructed using the user data bits received (from the RA0 in the asynchronous case). Adaptation of 600 bit/s to 8Kbit/s
47、 is performed by 8 times consecutive duplication of each user data bit. (Figure 11) Adaptation of 1200 bit/s to 8 Kbit/s is performed by 4 times consecutive duplication of each user data bit. (Figure 10) Adaptation of 2400 bit/s to 8kbit/s is performed by 2 times consecutive duplication of each user
48、 data bit. (Figure 9) Adaptation of 4800 bit/s to 8 Kbit/s is performed by transmitting the bit stream with no duplication. (Figure 7) Adaptation of 9600 bit/s to 16 Kbit/s is performed by transmitting the bit stream with no duplication (the emitting period is halved with respect to the 4800 bit/s c
49、ase). (Figure 7) Adaptation of 14400 bit/s to 32 Kbit/s is performed as for 3600 bit/s to 8 kbit/s (the emitting period is divided by four with respect to the 3600 bit/s case).( Adaptation of 3600 bit/s to 8 kbit/s is performed by transmitting the bit stream with no duplication.) (Figure 8) Adaptation of 19200 bit/s to 32 Kbit/s is performed as for 4800 bit/s to 8 kbit/s (the emitting period is divided by four with respect to the 4800 bit/s case). (Figure 7) Adaptation of 28800 bit/s to 64 Kbit/s is performed as fo
