TR 23.877
Architectural aspects of Speech-enabled services

V6.0.0 (Wzip) 2004/04 18 p.

full Table of Contents for TR 23.877 Word version: 6.0.0

Scope p. 5

References p. 5

Definitions and abbreviations p. 6

3.1	Definitions p. 6
3.2	Abbreviations p. 6

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

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

5.7.1	An alternative solution for triggering speech recognition session via CTM p. 10
5.7.2	CTM devices used between UE and ASR server p. 11

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

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

Security p. 15

Privacy p. 15

Analysis and conclusions p. 16

10.1	Impact of potential techniques on network entities p. 16
10.2	Summary p. 17

Change history p. 18