7 Work item history and status

10.703GPPGSM Adaptive Multi-Rate Speech Codec (AMR)Project schedule and open issues for AMRTS

This section provides the project history after SMG#23 and lists the open issues.

7.1 SMG2

7.1.1 History


Bonn, Germany, November 3-7, 1997:
Preparation of the qualification phase (static and dynamic error patterns, system simulator, TRAU Frame, Use of stealing flags)


Nuremberg, Germany, January 12-16 , 1998:
Preparation of the qualification phase (definition of the system simulator for the preparation of the error patterns, maximum acceptable data rates on Abis/Ater and preliminary solutions for the TRAU Frame, DTX operation)

March 1998

Approbation and release of the system simulator and Error Patterns by Correspondence


Kuusamo, Finland, April 20-24 , 1998:
Review of the system simulator performances and characteristics of the Error patterns


Høje Taastrup, Denmark, August 31-September 3, 1998:
Review of the Liaison Statement from SMG11, Discussion on Fast Power control


Milan, Italy November 2-6, 1998:
General review of the project status. Review of the proposed channel coding for the selected solution, in addition to the technical options for the completion of the standard (Radio channel performances, specification of the codec adaptation performances).
Initial review of impact on Ater/Abis TRAU frames

SMG2 WPA9811

Bois d’Arcy, France November 2-6, 1998:
General review of the project status. Review of the technical option for the standardization of the AMR Layer 3 signaling.


Dresden, Germany November 16-20, 1998:
Review of new a proposal for the support of a second set of polynomials for the AMR Channel Coding

Joint SMG2/SMG11

Sophia-Antipolis, France January 11, 1999:
Review of the test results on the evaluation of the different channel coding alternatives.
Agreement to send two alternatives to SMG#28 for decision
Review of the draft 05.09, available Change Requests and proposals for the AMR TRAU frames for the 16 kbit/s A-bis/A-ter sub-multiplexing scheme

SMG2 WPA#1/99

Sophia-Antipolis, France January 12-15, 1999:
Review and approval of all Layer 3 signaling Change Requests for the introduction of AMR (CRs on 04.08, 08.08 and 08.58)


Sophia-Antipolis, France January 12-15, 1999:
Review and approval of 05.09 and available Change Requests on 05 serie


Sophia-Antipolis, France January 22-29, 1999:
Review and approval of the new recommendation and available change requests
Ad Hoc for the review of the proposed TRAU frames

7.1.2 Future

Review and approval of the remaining CRs on 05.05 (channel performance tables), 08.60 and 08.61 (TRAU frames).

7.1.3 Upcoming meetings

April 12-16, 1999

Joint SMG2 WPA/WPB/Plenary

7.2 SMG3

7.2.1 History


Sophia-Antipolis, France January 22-29, 1999:
Review and Approval of AMR related Change Request

7.2.2 Future

None required

7.2.3 Upcoming meetings

January 25-29, 1999

SMG3 WPA followed by SMG3 Plenary

7.3 SMG11

7.3.1 History


Bad-Aibling, Germany, November 17-21, 1998:
Preparation of the qualification phase
Preliminary definition of the design constraints


Dresden, Germany, January 19-23, 1998:
Preparation of the qualification phase
Preliminary agreement on the qualification rules


Milan, Italy, February 16-20, 1998:
Preparation of the qualification phase
Agreement of the design constraints and qualification rules


Versailles, France, March 23-25, 1998:
Final approval of Qualification Permanent documents
Release of System Simulator and Error Patterns


Stockholm, Sweden June 3-5, 1998:
Review of the Qualification test results


Stockholm, Sweden, June 6-12, 1998:
Approval of the Qualification test results.
Recommendation to SMG on list of qualified candidates


Tampere, Finland, July 28-30, 1998:
Preparation of the selection tests
Agreement on selection deliverables and selection rules


St-Laurent-du Var, France, September 28-October 2, 1998:
Review of the selection test results. Selection of an AMR solution for standardization


Tampere, Finland, October 12-16, 1998:
Identification and Allocation of Verification items, Schedule of remaining tasks for the completion of the AMR specification.
Review of updated draft AMR specifications.


Miami, Florida, November 23-27, 1998:
Review and approval of the results of the optimization phase
Completion of the first part of the verification phase (Partial)
Review of updated draft AMR specifications including the VAD/DTX/CNG specifications
Approval of the optimized version of the code to be released for the second part of the verification phase including the ENS proposed VAD/DTX/CNG
Compromised agreement to evaluate alternative channel coding schemes as proposed by SMG2 and possibility for SMG11 members to finalized alternative VAD proposals by SMG11#8Bis


London-Heathrow, UK, December 17, 1998:
Review of the results of the evaluation of alternative channel coding scheme
Submission of alternative VAD specification and related test results


Helsinki, Finland, January 18-22, 1999:
Review of the available results of the second part of the verification phase
Approval of the Characterization Test Plan
Approval of the AMR specifications of the 06 series

Agreement to include two VAD options in the standard with a strong desire to remove one option by SMG#29 if feasible

7.3.2 Future

Execution of the Characterization Tests in 1Q99.

Completion of remaining activities (TFO, Characterization, Test Sequences and Test specifications) for approval at SMG#29.

7.3.3 Upcoming meetings

April, 1999


May, 1999


7.4 Project Schedule

The key remaining project milestones are shown in the following diagram:

7.5 Open Issues

Action To be completed by:

AP1: Identification of Editors for the AMR recommendations and CRs Closed

A sub-group must be set up for the definition of the AMR TRAU Frames and the preparation of the AMR CRs.
A preliminary discussion took place in TFO#18 during SMG11#8 to address the TFO requirement for the AMR TRAU frame. It was also agreed during an informal meeting to try to finalize the 16 kbit/s sub-multiplexing option before SMG#28 while leaving the 8 kbit/s option to be finalized for SMG#29.
During the joint SMG2/SMG11 meeting in 01/99 two alternative TRAU frame structures were proposed by Ericsson and Alcatel/Nortel. No decision was reached on either solution during the joint SMG2/SMG11 meeting. Two other opportunities to discuss this subject were identified: during the SMG11#9 meeting on week 3/99 and during the SMG2#29 plenary on week 4/99.
The dedicated TFO requirements were discussed again in an informal meeting during SMG11#9. The two proposed alternatives were once again analyzed and finalized in an Ad-Hoc meeting during SMG2#29. A final decision is now pending the definition of TFO operation for AMR

AP3: Synchronization required between AMR TRAU Frames and radio TDMA Frames Closed

AP4: Definition of Codec adaptation performances Closed

AP5: Radio Channel Performances SMG2
Volunteer organizations required to prepare simulation on Radio Performances.
Radio Performances simulation still not available, but expected for week 5/99 with inputs from Siemens (on speech channels), Ericssson (on In band signaling) and Nokia (on SID related frames)
Change Request on 05.05 to be approved for SMG#29 after selection of a channel coding scheme

AP6: Definition of layer 3 Signaling Closed

Analysis and consideration to be given to VAD/DTX proposals coming from outside the selection winning consortium. SMG11#8 agreed that organizations interested in contributing to the AMR VAD specification would be awarded the same two weeks allowed for the investigation of the alternative channel coding schemes, to provide additional information on their VAD solution.
Motorola provided over the Email reflector additional test results and a draft specification proposal before SMG11#8bis. Due to a lack of time, this alternative VAD proposal was not discussed in SMG11#8bis. It was only reviewed in SMG11#9.
SMG11#9 decided to include the Motorola VAD proposal as a second VAD option in the relevant specification with a strong desire to delete one option by SMG#29 if feasible.

AP8: Agreement on NDAs for the release of the C-Code originated from ENS Closed

AP9: Characterization Phase Funding: SMG11
Detailed Test and Budget Plan prepared by SMG 11 and provided to the GSM MoU by end of November 1999.
Partial funding (300 kECU) accepted by the GSM Association in December 1998
Pending agreement on required funding complement

AP10: Modification of AMR Channel Coding SMG
SMG2 proposed to specify an alternative Channel Coding scheme using the existing GSM polynomials (as defined in GSM 05.03 version 6.1.1). This proposal was discussed in SMG11#8 and it was decided to investigate the speech quality impact of the proposed restriction. The results of this investigation were first provided over the Email reflector (12/13/98), then reviewed in an ad-hoc SMG11#8Bis meeting on 12/17/98. The investigation results were provided to SMG2 and discussed during the joint SMG2/SMG11 meeting in week 2/99. It was not possible to reach an agreement on one single solution during this meeting. As a result, it was decided to send a liaison statement to SMG with two versions of the AMR CR on 05.03 corresponding to the two channel coding scheme alternatives. The liaison statement is asking SMG to select one option for standardization.

AP11: Completion of the Verification items SMG11
Motorola must release the C-Code for the second VAD option in a format exploitable for the completion of the verification items with both VAD options
SMG11 members participating to the verification phase must finalize their commitment with the two VAD options if applicable and the channel coding scheme selected by SMG if necessary