What is happening today with IPTV? Well, IPTV is basically similar to Cable TV with about 100+ channels broadcasted using IP Multicast over DSL. All users are expected to watch one of those channels so dimensioning the system is easy. However, if all users start watching different TV programs at their most convenient time, then you have a major scalability problem since you need to handle a massive number of streams. Rather than dimensioning your network for the number of channels, you will have to do it for the number of users. And this is exactly what is happening in Korea where a lot of people do not watch live broadcast TV anymore. Instead, VoD services offer all TV shows and movies that you could imagine for download. So you do not need broadcast TV nor have your VCR recording all the time. Instead, you can download the programs you missed whenever you want. As a result, most users are disconnecting their cable/satellite subscription as soon as they subscribe to the VoD service! Of course, the content providers are cooperating and fostering this type of services by making the content available in a DRM digital form soon after it is aired (often within the same day). If most of the content is available through illegal P2P downloads anyway, they may as well try to engage the user through a legal VoD system and recover some of the revenue. This is an area where a lot of progress needs to be made in Europe/US before such service becomes available. The cost of the service varies from $10-$15/month and you can basically download as many movies/videos as you want. Average download speeds in Korea are >30Mbps, so in the blink of an eye you have your favorite TV program. The system supports both progressive downloads for real-time viewing and background delivery. What I found most interesting is the deployment model, which is based around Telcos (i.e. as opposed to VoD portals like Amazon or iTunes). The first generation of VoD services were target for the PC, however, the new generation is based on Set-Top-Boxes, which integrate better with the TV. The reason why ISPs are in a good position to provide this service is because the already have a relationship with the customer and thus, it becomes natural to provide users with a set-top-box which is ready for VoD. The set-top-box is given for free as long as the user subscribes for a given period of time (e.g. a year). The fact that the VoD service is provided by a particular ISP is creating some interesting scenarios. For instance, some users are deciding to switch access ISPs but still keep their original VoD service with the first ISP. Of course, the traffic now is being carried through a number of visiting ISPs who expect some form of compensation, so the VoD ISP often needs to make financial arrangements with those visiting ISPs. This all sounds very good, but it is posing major challenges in the IP distribution network since all users are pulling VoD content using point-to-point connections. So what is coming… well, you guessed it: P2P VoD and live-streaming in set-top-boxes, which should remove most of the heat from the ISPs VoD servers. We should expect some deployments of such P2P stb coming soon, so keep an eye...
The inventor of the electric lightbulb could hardly have imagined that one day his creation would be used not only to illuminate homes around the world, but also to transmit data that would enable people to download information from satellites in space to small hand-held devices. However, with the introduction of Li-Fi, household lighting could soon double as a form of data transmission that’s up to 100 times faster than Wi-Fi. Li-Fi, which was first invented by Harold Haas of the University of Edinburgh in 2011, uses visible light communication (VLC) to send data at extremely high speeds. Essentially, this works like an incredibly fast signal lamp, flashing on and off in order to relay messages in binary code (1s and 0s). In previous lab-based experiments, the technology was able to transmit up to 224 gigabits per second. To put this in perspective, Wi-Fi is capable of reaching speeds of around 600 megabits per second. The technology has now been deployed in real-life situations for the first time, thanks to the work of Estonian start-up Velmenni, which has begun trialling Li-Fi in offices and other industrial settings in Tallinn. In these environments, they were able to achieve connection speeds of around one gigabit per second. Aside from its superior speed, Li-Fi also boasts a number of other benefits over Wi-Fi. For instance, the fact that the signal is carried by optical light means that it cannot travel through walls, therefore enhancing the security of local networks. Obviously, this produces a number of limitations as well, since it suggests that connection will be lost if a user leaves the room, representing a major hurdle that must be overcome if the technology is to be successfully implemented. However, if this barrier can be surmounted, then the use of the visible spectrum could allow Li-Fi to send messages across a much wider range of frequencies than Wi-Fi, which operates between the frequencies of 2.4 gigahertz and 5 gigahertz. As such, it has been suggested that Li-Fi could provide the answer to increasing frequency congestion as Internet usage continues to rise across the world. According to the Cisco Visual Networking Index Global Mobile Data Traffic Forecast, global monthly data usage is expected to exceed 24.3 exabytes by 2019 – a volume which current wireless connections are not able to handle. In a recent TED talk, Haas insisted that household LED lightbulbs could easily be converted into Li-Fi transmitters, providing Internet users with more efficient connections. “All we need to do is fit a small microchip to every potential illumination device and this would then combine two basic functionalities: illumination and wireless data transmission,” he said. It is also worth mentioning that the speed at which these LEDs flicker in order to relay data is too fast for the human eye to perceive, so users will not have to worry about annoying flashes in their ambient light.
Our end-to-end, convergent IPTV solution helps operators solve key problems on IPTV construction and operation from various aspects, such as system integration, service operation, operation support, and future sustainable development. Our Solution Rich service experience Provide rich audio and video services such as Live TV, Video On-Demand (VOD), Near VOD (NVOD), Time Shift TV (TSTV), TV On-Demand (TVOD), Personal Video Record (PVR), and Network PVR (nPVR). It also provides innovative and differentiated value-added services such as information browsing, interactive advertising, interactive games, interactive guessing game, and online transactions.
The IP Multimedia Subsystem (IMS) is a concept for an integrated network of telecommunications carriers that would facilitate the use of IP (Internet Protocol) for packet communications in all known forms over wireless or landline.