TR 23.877
Architectural aspects of Speech-enabled services
V6.0.0 (Wzip)
2004/04 18 p.
- Rapporteur:
- Dr. Xuan, Qing
-
full Table of Contents for TR 23.877 Word version: 6.0.0
1 Scope p. 5
The purpose of this technical report is to analyse the service requirements for speech enabled services as defined in TS 22.243 Speech recognition framework for automated voice services; Service aspects (Stage 1).
The service requirements on Speech Enabled Services defined in TS 22.243 may place architectural requirements on the CS and PS domains and the IMS. Additionally various techniques for improving speech recognition performance may be identified which have architectural impact.
The objective of TR is to document these architectural impacts.
2 References p. 5
3 Definitions and abbreviations p. 6
3.1 Definitions p. 6
3.2 Abbreviations p. 6
4 Techniques for improving speech recognition performance p. 6
4.1 Additional noise suppression in terminal p. 6
4.2 Disable DTX for improving ASR performance p. 6
4.3 Indication of use/non-use of DTX p. 7
4.4 Indication of codec mode to ASR platform p. 7
4.5 Command needed to provide high data rate codec for speech recognition mode p. 7
4.6 TFO needed in ASR platform for AMR wide band mode p. 7
4.7 Regional accents and ASR platforms p. 7
5 Impacts of speech recognition improvements on CS domain p. 7
5.1 High level TFO signalling flows in GSM/UMTS network p. 8
5.2 Activation mechanism for SRM session p. 9
5.3 Deactivation mechanism for SRM session p. 9
5.4 ASR platform outside of the Mobile Network p. 10
5.5 Charging p. 10
5.6 Roaming p. 10
5.6.1 Inbound roaming p. 10
5.6.2 Outbound roaming p. 10
5.7 An alternative solution for triggering speech recognition session via CTM p. 10
6 Impacts of speech recognition improvements on PS domain p. 11
6.1 Charging - RADIUS connected to ASR platform p. 11
6.2 Fetching regional accent information from MSISDN associated database p. 11
6.3 Roaming p. 12
7 Impacts of speech recognition improvements on IMS domain p. 12
7.1 ASR server directly "through connects" the call to the B party p. 12
7.2 ASR server acting in call transfer mode p. 13
7.3 Uni-directional codec and SDP p. 14
7.4 Charging p. 14
7.5 Roaming - support of roaming users p. 14
8 Security p. 15
9 Privacy p. 15
10 Analysis and conclusions p. 16
$ Change history p. 18
