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Background for development of Global Text Telephone services

Explore the need for text conversation services, character set standards, transmission rates, and more in global text telephony. Understand the importance of accessibility, standardization, and future expectations in this evolving field.

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Background for development of Global Text Telephone services

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  1. 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

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

  8. Total Conversation – a full example, but subsets are possible Video Voice Text Background for Global Text Telephony

  9. 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

  10. 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

  11. 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

  12. Short term proposals • Audio coding of text. • Data path with voice Background for Global Text Telephony

  13. 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

  14. 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

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