Background for development of Global Text Telephone services

Transcription

1 3GPP TSG SA #7 March , Madrid TSGSA#7(00)0115 Background for development of Global Text Telephone services Presentation by Gunnar Hellström, Ericsson Background for Global Text Telephony 1

2 Users of text conversation 6% 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 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 2

3 User needs in ETSI ETR 333 Text Telephony, User Requirements and Recommendations. Character set for any language used (ISO ) Transmission character by character. Suitable transmission rate 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 3

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 4

5 Status of standardisation Main work in ITU-T SG16 Q9. Accessibility to Multimedia for people with disabilities. Main work : 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 5

6 , 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 Channel What is the street address? Alameda 34 Background for Global Text Telephony 6

7 Total Conversation - a growing family Ready Ready Ready Ready Ready Text telephony H.324 Voice and video T.120 Data conferencing H.320 Voice and video H.323 Voice and video Proposed work H.324 Mobile system Voice and video H.323 Mobile system Voice and video Textelephony Equalizers Trans parent AL1 H.245 T.134 T.124 GCC H.224 RTP H.245 AL1 H.245 RTP H.245 V.18 PSTN On the way H.223 V.34/V.80 PSTN T.123 DATA CONF. H.221 Network access ISDN H Network access IP H.223 Mobile transmission H Mobile transmission MOBILE H.248 Annex F Text Conversation gateway Background for Global Text Telephony 7 Mob

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

9 V.18 An automoding modem - a bridge to unify a fragmented world Can be used in terminals, gateways and servers Example of use USA, UK USA Holland Germany France Anywhere Sweden, UK Background for Global Text Telephony 9

10 Existing text telephone methods Summary 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 10

11 Expectations on mobile text telephony Internationally useful based on 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 11

12 Short term proposals In T1P1.5 and 3GPP S4, proposals for text coding in the radio interface of three strains are discussed. (Lucent no gain ) Use history bits in audio coding to carry 5-bit Baudot characters. Solution for USA, Canada, Australia, NZ only. Implement in mobile station and TRAU. (Nokia data ) Use IWU with textphone modem, and mobile data services. Requires data services.gives text only support. (Ericsson EMT ) Use new voice band modem and interworking unit or TRAU implementation for text + voice support. Background for Global Text Telephony 12

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 13

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 14