ITU-T. FG CarCom Version 1.0 (11/2013) Final Report. ITU-T Focus Group on Car Communication. Focus Group Technical Report

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1 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU FG CarCom Version 1.0 (11/2013) ITU-T Focus Group on Car Communication Final Report Focus Group Technical Report

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3 FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The procedures for establishment of focus groups are defined in Recommendation ITU-T A.7. The ITU-T Focus Group on Car Communication (FG CarCom) was established further to ITU-T SG12 agreement at its meeting in Geneva, 3-12 November 2012 and successfully concluded in March ITU-T Study Group 12 was the parent group of FG CarCom. Deliverables of focus groups can take the form of technical reports, specifications, etc. and aim to provide material for consideration by the parent group or by other relevant groups in their standardization activities. Deliverables of focus groups are not ITU-T Recommendations. SERIES OF FG CarCom TECHNICAL REPORTS Final Report ITU 2013 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU.

4 - 2 - Contents Abstract Introduction Achievements... 3 Annex 1 List of people participating in the work of FG CarCom... 6 Annex 2 List of documents... 8

5 - 3 - Abstract ITU-T FG CarCOM held its 1 st meeting in Vancouver on Jan. 2010ant its 12 th and last meeting in Geneva on Nov The participants in the group ranged from car manufacturers, suppliers to telecom companies and universities. The group was able to attract the relevant experts in this field. The main work of FG CarCom was the work on a new concept on the characterization of subsystems found in a car and used for hands-free communication. A concept was developed how to describe the different subsystems in such a way that this concept can be applied for all types of implementations. A new concept of performance class was developed and applied to all individual parameters used to characterize the different subsystems. New methods to simulate acoustics environments were developed and integrated in the Draft standard FG.VSSR. These methods which take into account e.g. the time variant behavior of acoustical transmission path could be applied to a variety of other ITU-T standards. The output of the work can be found in the latest version of the focus group standard FG.VSSR which was handed over to ITU-T SG12 for discussion and completion at the end of FG CarCom. 1 Introduction This document is the final report from ITU-T FG CarCOM. All meeting documents are available on the ITU-T website and may be downloaded at: During the lifetime of the focus group the group met 12 times at different places of the world, typically alternation between North Amrica, Europe and Japan. The participants were coming from different parts of the world and were representing car manufacturers, suppliers, telecom companies, test system manufacturer and universities. A list of all participants of FG CarCom can be found in Annex 1. 2 Achievements The group concentrated on two main areas. The first area dealt with the revision and harmonization of the ITU-T Recommendations P.1100 and P This work was successfully completed and a draft proposal was submitted to ITU-T SG 12. The second area dealt with the creation of a new specification dealing with subsystem requirements for car hands-free subsystems. This Specification defines test methodologies for and standard behaviour of subsystems used in automotive speakerphone terminals. The purpose is to provide guidance on the design and optimization of subsystems as well as diagnostic capabilities needed to give a consistent and high Quality of Service of the overall speakerphone terminal for the users of such devices. This specification is intended to give guidance to all parties involved in the design and integration of speakerphone terminals. This specification covers both, narrowband and wideband systems.

6 - 4 - The concept of sub-dividing a telecommunication terminal into different sub-systems is new to ITU-T and required very general discussions. In addition a new concept of performance classes had been introduced. Instead of defining fixed limits different limits for different performance classes were defined. This concept had been introduced to all parameters of the different subsystems. The main achievements here can be summarized as follows: 1. Creation and definition of car hands-free subsystems Fig. 1 shows the definition of the different sub-systems as it was worked out by FG CarCom. This subsystem concept takes into account all known subsystem implementations. FG.VSSR describes how to apply this subsystem concept to the different realizations found in cars Fig. 1: System overview with the example of typical devices 2. Generalized interface definition taking into account individual implementations Since interfaces between subsystems are implementation dependant and often proprietary a concept had to be developed how to describe the access to these subsystems in a generalized way. 3. Performance Class approach In order to classify a subsystem with regard to its impact on QoS of the complete system a concept was needed which helps to classify the different parameters of subsystems. For this purpose a performance class approach was developed which allows the classification of each parameter following the same concept: Performance Class 1: Performance Class 1 characterizes an exceptionally good implementation of the relevant parameter. Performance Class 1 can typically only be achieved with special constraints or effort in terms of design, cost and time. Performance Class 2: Performance Class 2 characterizes an implementation which most likely fulfils the requirements in ITU-T Recommendation P.1100 and P Performance Class 2 can be expected to be representative for good implementations. Performance Class 3:

7 - 5 - Performance Class 3 characterizes some weakness for the parameter under test. If a parameter is fulfilling just Performance Class 3 it may be acceptable only given that other parameters benefit from that or may compensate the weakness of this parameter and the complete system is still fulfilling the requirements of ITU-T Recommendation P.1100 and P Performance Class 4: Performance Class 4 characterizes an unacceptable weakness of the parameter under test. 4. Generalized analysis of frame process and resulting delay Frame or packet based transmission may appear at different interfaces or different subsystems. One issue is the synchronization of different frame rates and the resulting delay. FG.VSSR contains a chapter describing all elements of different types of frame synchronization and their impact on delay. 5. New methodology for the recording and applying of time variant impulse response traces Since the subsystem concept is intended to be used in the car but outside the car as well a methodology was needed allowing the complete simulation of the time variant acoustical properties of a car. Part of this simulation technique is a new method for recording and applying time variant impulse responses described in FG.VSSR. 6. New method of reference free SNR measurement Another achievement is the introduction of a new method for reference free SNR measurements. Due to the lack of such methods in ITU-T a new method was developed. 7. New method for measuring noise distortion Besides classification of the different subsystems optimization of individual parameters of a subsystem may be required. A newly introduced method for measuring noise distortion may help to optimize the noise cancelling performance of subsystems. The result of all the work and contributions is found in the final draft of the FG CarCom specification which was handed over to ITU-T SG12 after termination of FG CarCom as input for the planned ITU-T Recommendation P.VSSR.

8 - 6 - Annex 1 List of people participating in the work of FG CarCom John Bareham JB Consultant in Electroacoustics Stefan Bleiholder SB HEAD acoustics GmbH Rajko Bjelica RB Chrysler Group LLC - USA Daniel Brasier DB Johnson Controls- USA Toby Eadelman TE Johnson Controls- USA Balazs Fodor BF Braunschweig Technical University - Germany Dan Foley DF Audio Precision Mats Forsen MF Forsen Data AB- Sweden Tim Fingscheidt TF Technische Universität Braunschweig, Germany Hans W. Gierlich HG HEAD acoustics GmbH FG CarCOM Chair- Germany Fridjof Goebel FG Daimler - Germany Matthew Goulet MG QNX Software Systems Jesse Gratke JG General Motors- USA Scott Groendyke SG Johnson Controls- USA Evandro Gouvea EG Mitsubishi (MERL)- USA Tim Haulick TH Nuance- Germany Michael Hervé MH Parrot SA - France Glenn Hess GH Harman International Yoji Ishikawa YI Asahi Kasai Cooperation - Japan Marc-Andre Jung MAJ Technische Universität Braunschweig - Germany Senthil Kumar SK QNX Software Systems- Japan Michael Klose MK Peiker Akustik Markus Lieb ML Volkswagen AG Tsuyoshi Masuda TM Asahi Kasei Corporation- Japan Sheila McFarland SM QNX Software Systems- Canada Yushi Naito YN Mitsubishi Electric Corporation, SG16 Chair Japan Paul Nicastri PN Ford Motor Company

9 - 7 - Lars Nielsen LN Bruel&Kjaer- Denmark Dirk Olszewski DO Daimler - Germany Scott Pennock SP Research in Motion- FG CarCOM Vice-Chair- Canada Rod Rempel RR QNX Software Systems Gerhard Schmidt GS CAU- Germany Brian Servis BS Johnson Controls- USA Bassam Shahmurad BSH General Motors- USA Christopher Steck CS Audience - USA Patrick Vicinius PV Peiker Akustik Bob Young BY IEEE Huajun Yu HY Braunschweig Technical University - Germany

10 Annex 2 List of documents