- Количество слайдов: 15
Forecast 2002 Digi. TAG Spectrum Matters Task Group J. Kämäräinen Copenhagen 22 nd April 2003
DVB-T Service Requirements – New Possibilities for DVB-T Large wide-screen displays or highdefinition TV
DVB-T Service Requirements – New Possibilities for DVB-T Mobile TV reception!
DVB-T Service Requirements – New Possibilities for DVB-T Mobile TV reception Singapore buses
DVB-T Service Requirements – New Possibilities for DVB-T Interactivity!
DVB-T Service Requirements – New Possibilities for DVB-T Portable and hand-held devices with multimedia and interactivity!
Digi. TAG Spectrum Matters Workshop Need for DVB-T Service Requirements • Planning Conference to Revise Stockholm 61 • Service requirements will determine spectrum requirements: • number and capacity of multiplexes • coverage levels • portable or mobile coverage requirements • possible need for return channel capacity • Service requirements also affect network planning model • Requirements will vary from country to country
Digi. TAG Task Group on Spectrum Matters – Elements of Service Requirements • • Type of Service – e. g. TV, Datacasting. Internet Coverage – extent and regionality Capacity – number of multiplexes, or total Mbit/s Quality and Reliability – including % time availability Reception mode – fixed, portable and mobile Receiving equipment – e. g. large plasma displays Interactivity – use and capacity of return channel • Implementation options: • • • Transmitter network DVB-T variant Planning model (MFN/SFN)
Questionnaire Breadth of Response
Questionnaire Importance of Service Types High importance to traditional TV and widescreen. Less than 10% thought that HDTV important Respondents more committed to IP based services than to Internet TV.
Questionnaire Importance of Convergence - the use of multiple technologies to provide a service is seen to be important
Questionnaire Reception Conditions All respondents assigned some positive need to portable reception
Questionnaire Interactivity - Return channels for DVB-T Overwhelming conviction that return channel needed - little support for DVB-RCT
Questionnaire Total Capacity Requirements • All responses converted to Mbit/s • No distinction between fixed, portable and mobile reception • No account taken of coverage target
Questionnaire – Some Conclusions • Great importance attached to traditional and widescreen TV (but little to HDTV) • All respondents thought that portable reception was of medium or high importance • Overwhelming response that return channel important for DVB-T (but not via DVB-RCT) • 90% of respondents think that convergence is of high or medium importance • Majority of respondents see a need for DVB-T to deliver around 100 -150 Mbit/s in their country