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TR 26.969 (SA4)
eCall data transfer –
In-band modem solution –
Characterization report

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(P) V14.0.0    2017/03    77 p.
(P) V13.0.0    2015/09    77 p.
(P) V12.0.0    2014/09    67 p.
(P) V11.0.0    2012/09    67 p.
(P) V10.0.0    2011/04    67 p.
(P) V9.1.0    2011/04    67 p.
(P) V8.2.0    2011/04    65 p.

Rapporteur:  Mr. Leung, Nikolai
See also:  eCall-related TS/TR    

This TR characterizes the performance of the eCall In-band Modem, which is used for reliable transmission of the eCall Minimum Set of Data (MSD) from an In-Vehicle System (IVS) to the Public Safety Answering Point (PSAP) via the voice channel of cellular and PSTN networks.

The European Union eCall requirements, recommendations and guidelines were developed by eSafety Forum, with important additional work produced by ETSI MSG, GSME, 3GPP, and CEN.

Previous work in TR 22.967 "Transfer of Emergency Call Data", examined the issues associated with the transmission of emergency call data from a vehicle to a PSAP. This analysis identified that the preferred option be based on an in-band modem solution.


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1   Scope   PDF-p. 6
2   References
3   Definitions and abbreviations   PDF-p. 7
4   Selection tests   PDF-p. 9
5   Verification and characterization tests   PDF-p. 13
5.1   Performance with dynamic jitter buffer
5.2   Performance with echo cancellation   PDF-p. 15
5.3   Performance with transcoding   PDF-p. 16
5.4   Performance with packet loss concealment techniques
5.5   Performance with other codec types   PDF-p. 21      Up
5.6   Performance with additional channel conditions   PDF-p. 26
5.7   Varying channel conditions   PDF-p. 28
5.8   Performance with static jitter buffer   PDF-p. 29
5.9   Noisy conditions
5.10   Erroneous tone detection   PDF-p. 34
5.11   Gaps in transmission due to handovers
5.12   Change of speech codec   PDF-p. 36
5.13   Sample slip / small delay variations at handover   PDF-p. 38
5.14   Combinations of test conditions
A   eCall test setup   PDF-p. 40
B   Required transmission times for IVS initiated eCall signalling and HL-ACK   PDF-p. 45
C   Extended simulation results   PDF-p. 46
D   Additional Performance Indicators   PDF-p. 66
E   Change history   PDF-p. 75

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