TAILIEUCHUNG - ULTRA HIGH DEFINITION THE NEXT REVOLUTION IN THE TV WORLD?

While peer-to-peer (P2P) video streaming systems have achieved promising results, they introduce a large number of unnecessary traverse links, which con- sequently leads to substantial network ine±ciency. To address this problem and achieve better streaming performance, we propose to enable cooperation among group peers, which are geographically neighboring peers with large intra-group up- load and download bandwidths. Considering the peers sel¯sh nature, we formulate the cooperative streaming problem as an evolutionary game and derive, for every peer, the evolutionarily stable strategy (ESS), which is the stable Nash equilibrium and no one will deviate from. . | EUTEL5AT _ s POT LI oil T ULTRA___________ HIGH DEFINITION THE NEXT REVOLUTION IN THE TV WORLD ULTRA HIGH DEFINITION THE NEXT REVOLUTION IN THE TV WORLD Television has itself witnessed many revolutions in just a few years from black white to colour analogue to digital standard definition SD to high definition HD and from heavy and bulky cathode ray tubes to compact and much lighter plasma LCD or LED flat screens. Not forgetting the advent of trans-national digital TV via satellite and the related explosion in the number of channels carried. UllTa High efiniHon whai for The digital revolution which is impacting the cinema industry began by a format known as 2K and is continuing with 4K for very large screens. In parallel many leading filmmakers recommend using a high frame rate HFR by increasing the image frequency from 24 to 48 and possibly even 60 frames per second fps to improve visual comfort when viewing high-velocity shooting. In terms of technical quality HD TV is close to 2K cinema but if cinema theatres increasingly offer 4K images on very large screens viewers will soon want the same thing at home larger pictures very high resolution excellent rendering of colours doubling of the image frequency immersive viewing . As technological progress enables manufacturers to offer screens that get lighter thinner and better year by year at affordable costs the trend is obviously to have the slimest screen possible at home and to hang it on the wall or to replace it by a state-of-the-art projector. In terms of image resolution HD will become insufficient on large screens and this is where Ultra High Definition UHD will come into its own. With respect to events where Eutelsat has played a pioneer role in Europe live retransmission of cultural artistic or sports events to cinema theatres is currently carried out in HD comparable to 2K cinema. To avoid disappointing viewers who will become accustomed to 4K quality in feature films such retransmissions will have to move

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