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3GPP TSG S1 #8 April 10-15, Beijing Agenda item 6.6.1. TSGS1#8(00)0223. Background for development of Global Text Telephone services. Presentation by Gunnar Hellström, Ericsson . Users of text conversation 6% of the population has limited use of voice telephony.

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background for development of global text telephone services

3GPP TSG S1 #8 April 10-15, Beijing

Agenda item 6.6.1

TSGS1#8(00)0223

Background for development of Global Text Telephone services

Presentation by

Gunnar Hellström,

Ericsson

Background for Global Text Telephony

users of text conversation 6 of the population has limited use of voice telephony
Users of text conversation6% of the population has limited use of voice telephony
  • 5% are Hard - of - hearing -- need text or lip-reading
  • 2 per 1000 are Deaf - need text, signing or lip-reading
  • Many are deaf by age – need voice out – text in.
  • 1 per 1000 are Speech impaired - need text one way, voice in the other + visual contact
  • 1 per 10 000 are deaf-blind - need tactile and visual enlargement
  • + All of us need language amplification by text and video
  • Conclusion: Clear need for text conversation services

Background for Global Text Telephony

user needs in etsi etr 333 text telephony user requirements and recommendations
User needs in ”ETSI ETR 333 Text Telephony, User Requirements and Recommendations”.
  • Character set for any language used (ISO 10 646)
  • Transmission character by character.
  • Suitable transmission rate. 10 – 15 char/second.
  • Display so that it is easy to follow the conversation even if both are writing concurrently.
  • Simple editing consisting of new line and erase last character.
  • Visual call progress and network info
  • Combination with voice

Background for Global Text Telephony

important requirements on text telephone services
Important requirements on text telephone services
  • Emergency services
  • Relay services, for translation between text and voice, for accessibility to all voice telephone users
  • Interoperability wherever voice services are offered.
  • Not continue the fragmentation of text telephony from the PSTN

Background for Global Text Telephony

status of standardisation
Status of standardisation
  • Main work in ITU-T SG16 Q9. Accessibility to Multimedia for people with disabilities.
  • Main work 1997-2000:
    • Add a text conversation facility in a clean way to all Multimedia Protocols.
    • Mainenance on the automoding modem standard V.18.

Background for Global Text Telephony

t 140 the common base for text conversation
T.140, the common base for text conversation
  • Extremely simple text chat protocol
  • User input to Unicode UTF-8 coded transmission
  • UTF-8 transmission to display
  • Easy to include everywhere

User

T.140

Channel

What is the street address?

Alameda 34

Background for Global Text Telephony

total conversation a growing family

T.120 Data

H.324

H.320

H.324

H.323

Text

Text

telephony

telephony

H.323

conferencing

Mobile system

Mobile system

Voice

Voice

Voice

Voice

Voice

and

and

and

and

and

T.140

T.140

T.140

T.140

T.140

T.140

T.140

T.140

video

video

video

video

video

AL1

H.245

AL1

H.245

RTP

H.245

H.224

T.134

T.124

Equal-izers

RTP

H.245

Trans

GCC

parent

H.223

H.221

H.223

H.225.0

H.225.0

T.123

Network

Mobile

Mobile

V.18

Mob

Network

V.34/V.80

access

transmission

transmission

access

PSTN

ISDN

DATACONF.

IP

Total Conversation -a growing family

Ready

Ready

Ready

Proposed work

Ready

Ready

MOBILE

PSTN

H.248 Annex F Text Conversation gateway

On the way

Background for Global Text Telephony

total conversation a full example but subsets are possible
Total Conversation – a full example, but subsets are possible

Video

Voice

Text

Background for Global Text Telephony

slide9
V.18 An automoding modem - a bridge to unify a fragmented worldCan be used in terminals, gateways and servers

Example of use

USA, UK

USA

Holland

Germany

France

Anywhere

Sweden, UK

Background for Global Text Telephony

existing text telephone methods summary
Existing text telephone methodsSummary
  • Text telephony suffers from not being harmonized
  • V.18 is created to be a vehicle for harmonization
  • All current methods are possible to use and should be expected to continue to exist for many years.
  • New services should offer harmonised international communication

Background for Global Text Telephony

expectations on mobile text telephony
Expectations on mobile text telephony
  • Internationally useful – based on T.140
  • Interoperability with legacy modes text telephones through V.18.
  • Interoperability with other mobile textphones
  • Digital wireless interface from handset to text device.
  • Complete handsets with text foreseen
  • Text and voice combinations

Background for Global Text Telephony

short term proposals
Short term proposals
  • Audio coding of text.
  • Data path with voice

Background for Global Text Telephony

long term expectations on mobile text solutions
Long term expectations on mobile text solutions
  • Total Conversation implementations with Video Text and Voice
  • Mobile variants of H.324 and H.323 with text conversation additions
  • Interworking with land based variants of Multimedia protocols and text telephony

Background for Global Text Telephony

proposed actions for global text telephony
Proposed actions for Global Text Telephony
  • Start a work item in 3GPP SA for Global Text Telephony
  • Specify
    • Service description
    • Architecture
    • Coding
    • Interworking
    • Terminal aspects (?)
  • Aim at short term completion Dec – 2000, long term completion Dec 2001

Background for Global Text Telephony