1、 ETSI TS 101 709 V8.6.0 (2005-06)Technical Specification Digital cellular telecommunications system (Phase 2+);Link adaptation(3GPP TS 05.09 version 8.6.0 Release 1999)GLOBAL SYSTEM FOR MOBILE COMMUNICATIONSRETSI ETSI TS 101 709 V8.6.0 (2005-06) 1 3GPP TS 05.09 version 8.6.0 Release 1999 Reference R
2、TS/TSGG-010509v860 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 lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice Individual copi
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5、s of this and other ETSI documents is available at http:/portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the following services: http:/portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced except
6、 as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2005. All rights reserved. DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONTM
7、and the TIPHON logo are Trade Marks currently being registered by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI ETSI TS 101 709 V8.6.0 (2005-06) 2 3GPP TS 05.09 version 8.6.0 Release 1999 In
8、tellectual 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 for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property R
9、ights (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 (http:/webapp.etsi.org/IPR/home.asp). Pursuant to the ETSI IPR Policy, no investigation, including
10、 IPR searches, has been carried 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 be
11、en 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 interpreted as being references to the corresponding ETSI deliverables. The cross refer
12、ence between GSM, UMTS, 3GPP and ETSI identities can be found under http:/webapp.etsi.org/key/queryform.asp . ETSI ETSI TS 101 709 V8.6.0 (2005-06) 3 3GPP TS 05.09 version 8.6.0 Release 1999 Contents Intellectual Property Rights2 Foreword.2 Foreword.4 1 Scope 5 1.1 References 5 1.2 Abbreviations .5
13、2 General .5 3 Adaptive Multi-Rate inband control and link adaptation .6 3.1 General operation .6 3.1.1 Operation without Tandem Free Operation 6 3.1.2 Operation with ongoing Tandem Free Operation .7 3.1.3 Operation at handover with ongoing Tandem Free Operation7 3.2 Inband Signalling .7 3.2.1 Frequ
14、ent inband signalling for AMR codec mode adaptation 8 3.2.1.1 General aspects .8 3.2.1.2 Operation with DTX enabled 8 3.2.1.3 Transmitter/Receiver Synchronisation8 3.2.2 Robust inband signalling for AMR configuration modification .8 3.2.2.1 General aspects .8 3.2.2.2 RATSCCH protocol9 3.2.2.3 RATSCC
15、H messages 10 3.2.2.3.1 ACK_OK message 10 3.2.2.3.2 ACK_ERR message 10 3.2.2.3.3 ACK_UNKNOWN message .10 3.2.2.3.4 CMI_PHASE_REQ message 11 3.2.2.3.5 AMR_CONFIG_REQ message.11 3.2.2.3.6 THRESH_REQ message .12 3.3 Codec mode adaptation 12 3.3.1 Channel quality measure.12 3.3.2 Generation of Codec Mod
16、e Commands and Requests13 3.3.3 Performance requirements 13 3.3.3.1 MS response to the Codec Mode Command .13 3.3.3.2 BTS response to the Codec Mode Request .14 3.3.3.3 Performance of the Codec Mode Request Generation 14 3.4 Setup procedures 14 3.4.1 Definition of the AMR Active Codec Set.14 3.4.2 D
17、efinition of Codec Mode Command/Request decision thresholds .14 3.4.3 Initial Codec Mode Selection at Call Setup and Handover.16 Annex A (informative): Example Solution for Link quality estimation 17 Annex B (informative): Example Definition of Mode Command/Request decision thresholds18 Annex C (inf
18、ormative): Principles for AMR codec mode adaptation with TFO19 C.1 Downgrading19 C.1.1 Uplink downgrading.19 C.1.2 Downlink downgrading20 C.2 Upgrading.21 C.2.1 Downlink upgrading.21 C.2.2 Uplink upgrading22 Annex D (informative): Change history .23 History 24 ETSI ETSI TS 101 709 V8.6.0 (2005-06) 4
19、 3GPP TS 05.09 version 8.6.0 Release 1999 Foreword This Technical Specification 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 th
20、e 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 8.x.y where: 8 indicates release 1999. x the second digit is incremented for all changes of substance, i.e. technical enhancements, c
21、orrections, updates, etc. y the third digit is incremented when editorial only changes have been incorporated in the specification. ETSI ETSI TS 101 709 V8.6.0 (2005-06) 5 3GPP TS 05.09 version 8.6.0 Release 1999 1 Scope The requirements described in the present document are mandatory for implementa
22、tion in all GSM MSs and BSSs capable of supporting the Adaptive Multi-Rate speech traffic channel, unless otherwise stated. Unless otherwise specified, references to GSM include GSM at any frequency band. 1.1 References The following documents contain provisions which, through reference in this text
23、, constitute provisions of the present document. References are either specific (identified by date of 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 cas
24、e 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 GSM 01.04: “Digital cellular telecommunications system (Phase 2+); Abbreviations and acronyms“. 2 GSM 04.08
25、: “Digital cellular telecommunications system (Phase 2+); Mobile radio interface layer 3 specification“. 3 GSM 05.02: “Digital cellular telecommunications system (Phase 2+); Multiplexing and multiple access on the radio path“. 4 GSM 05.03: “Digital cellular telecommunications system (Phase 2+); Chan
26、nel Coding“. 5 GSM 05.05: “Digital cellular telecommunications system (Phase 2+); Radio transmission and reception“. 6 GSM 08.08: “Digital cellular telecommunications system (Phase 2+); Mobile-services Switching Centre - Base Station System (MSC - BSS) interface, Layer 3 specification“. 7 GSM 08.62:
27、 “Digital cellular telecommunications system; Inband Tandem Free Operation (TFO) of Speech Codecs“. 1.2 Abbreviations For the purposes of the present document, the following abbreviations apply. Further GSM related abbreviations are listed in GSM 01.04. AMR Adaptive Multi-Rate ACS Active Codec Set C
28、MC Codec Mode Command CMI Codec Mode Indication CMR Codec Mode Request ICM Initial Codec Mode RATSCCH Robust AMR Traffic Synchronized Control Channel 2 General The present document gives the detailed requirements for the correct operation of in call service specific link adaptation and control for G
29、SM services implemented in GSM Mobile Stations (MS)s and Base Station Systems (BSS)s. ETSI ETSI TS 101 709 V8.6.0 (2005-06) 6 3GPP TS 05.09 version 8.6.0 Release 1999 For the Adaptive Multi-Rate (AMR) speech service, the detailed description and requirements for the associated inband signaling, AMR
30、codec mode adaptation, and AMR codec configuration are given. An inband signaling channel is defined for AMR which enables the MS and the BTS to exchange messages on applied or requested speech and channel codec modes. Codec mode adaptation for AMR is based on received channel quality estimation in
31、both MS and BTS, followed by a decision on the most appropriate speech and channel codec mode to apply at a given time. The overall operation of AMR, in terms of used codec modes as well as general adaptation behaviour is controlled by the network. 3 Adaptive Multi-Rate inband control and link adapt
32、ation 3.1 General operation 3.1.1 Operation without Tandem Free Operation A high-level block diagram of the complete AMR system is depicted in figure 1. The system consists of the major components TRAU and BTS on the network side and the MS. On the network side, speech encoder (SPE) and channel enco
33、der (CHE) as well as channel decoder (CHD) and speech decoder (SPD) are connected via the serial A-bis interface. For each link, quality information is derived by estimating the current channel state. Based on the channel state, and also taking into consideration possible constraints from network co
34、ntrol, the codec mode control, which is located on the network side, selects the codec modes to be applied. The channel mode to use (TCH/AFS or TCH/AHS) is controlled by the network. Uplink and downlink always apply the same channel mode. For codec mode adaptation the receiving side performs link qu
35、ality measurements of the incoming link. The measurements are processed yielding a Quality Indicator. For uplink adaptation, the Quality Indicator is directly fed into the UL mode control unit. This unit compares the Quality Indicator with certain thresholds and generates, also considering possible
36、constraints from network control, a Codec Mode Command indicating the codec mode to be used on the uplink. The Codec Mode Command is then transmitted inband to the mobile side where the incoming speech signal is encoded in the corresponding codec mode. For downlink adaptation, the DL Mode Request Ge
37、nerator within the mobile compares the DL Quality indicator with certain thresholds and generates a Codec Mode Request indicating the preferred codec mode for the downlink. The Codec Mode Request is transmitted inband to the network side where it is fed into the DL Mode Control unit. This unit gener
38、ally grants the requested mode. However, considering possible constraints from network control, it may also override the request. The resulting codec mode is then applied for encoding of the incoming speech signal in downlink direction. Both for uplink and downlink, the presently applied codec mode
39、is transmitted inband as Codec Mode Indication together with the coded speech data. At the decoder, the Codec Mode Indication is decoded and applied for decoding of the received speech data. ETSI ETSI TS 101 709 V8.6.0 (2005-06) 7 3GPP TS 05.09 version 8.6.0 Release 1999 MSBTSTRAUUL codec mode (rece
40、ived)UL-Mode CtrlUL-Meas.SPESPECHE CHDSPD CHD CHESPDDL-Meas.DL-Mode CtrlDL codec modeUL Mode CommandUL Quality IndicatorUL Mode Command(received)DL Mode Request(received)speech dataspeech dataDL codec mode (received)networkcontrolDL-Req.GenDL Quality IndicatorDL Mode RequestFigure 1: High level AMR
41、block diagram Codec mode selection is done from a set of codec modes (ACS, Active Codec Set), which may include 1 to 4 AMR codec modes. Associated with this set is a list of 1 to 3 switching thresholds and hysteresis used by the DL Mode Request Generator and the UL mode control unit to generate the
42、Codec Mode Requests and Codec Mode Commands. These configuration parameters (ACS, thresholds, hysteresis) are defined at call set-up and can be modified at handover or during a call. 3.1.2 Operation with ongoing Tandem Free Operation If tandem free operation is ongoing (see GSM 08.62) then the speec
43、h signal has to be transmitted over two radio links, first uplink (MS1 to BTS1) and then downlink (BTS2 to MS2), respectively symmetrically in the reverse direction. The optimal Codec Mode in direction MS1 to MS2 shall be derived from the Codec Mode Request for the first uplink (CMC1, within BTS1) a
44、nd the Codec Mode Request derived for the second downlink (CMR2 within MS2) in the following way: MS2 shall send the CMR2 back to BTS2 in the usual way. BTS2 shall either accept this CMR2 (default) or may modify it according to network control needs: CMR2. Then BTS2 shall send the CMR2 further uplin
45、k to its TRAU2, to TRAU1 and downlink to BTS1 (see GSM 08.62 on how this transmission shall be handled on Abis and A interfaces). BTS1 combines the received CMR2 with its own derived CMC1 by taking the minimum of both values. If needed, BTS1 may modify this minimum value according to own network con
46、trol ( CMC1) and shall send it finally downlink to MS1 as CMC. The identical procedure shall be performed in the reverse direction. Annex C gives an informative description. 3.1.3 Operation at handover with ongoing Tandem Free Operation Before and during an handover at one or both sides of the MS-to
47、-MS connection, it may be needed to freeze the codec mode adaptation for a short while, e.g. to optimise the common Active Codec Set, or to allow fast (re-)synchronisation between BTS and TRAU or to optimise the CMI Phase in downlink. Both BTSs may therefore enable or disable the codec mode adaptati
48、on (see GSM 08.62). As long as the codec mode adaptation is frozen to a specific codec mode, then this codec mode shall be used in both directions as long as tandem free operation is ongoing, or tandem free operation shall be discontinued. The Codec Mode Requests from the MSs may be taken into accou
49、nt to decide whether to continue TFO or not, but not for codec mode adaptation. 3.2 Inband Signalling The AMR inband signalling consists of two parts: - Frequent signalling, used for Codec Mode Indication and Codec Mode Command/Request. - Robust, less frequent signalling, based on frame stealing, used for changing the AMR configuration (RATSCCH). ETSI ETSI TS 101 709 V8.6.0 (2005-06) 8 3GPP TS 05.09 version 8.6.0 Release 1999 3.2.1 Frequent inband signalling for AMR codec mode adaptation 3.2.1.1 General aspects The codec mode information, which has to b
