It just uses the cellular phone network to offer interactivity and user authorization with the TV support provider. Because the 3G mobile phone network from AT&T and Verizon are both capable to carry IP traffic, it seems to be evident that the easiest implementation for cellular TV is applying IPTV. An example is AT&T currently using IPTV in their U-verse support (internet, phone and TV).
To realize why cellular TV does not use IPTV, the unicast nature of the cellular phone system needs to be explained. The current 3G (UMTS, EVDO) mobile phone system are made to take unicast traffic just, i.e. indicate place connection needs to be establish between an individual and the Media server for the system to supply the TV traffic to the cellular phone.
Since TV is a broadcast service, i.e. a point out multipoint relationship is needed for portable TV service. To implement point to multipoint relationship, the cellular phone system wants to create an IP relationship involving the Press machine and each cellular consumer getting the transmitted simultaneously. These many associations will simply overrun the capacity of the cellular phoneand prevents different style and knowledge traffic that requires to use the network.
For mobile TV to use IPTV, the IP multicast function must be implemented on the cellular phone network. Multicasting may be the manner of sending a single movie indicate simultaneously to multiple conclusion users. All readers obtain exactly the same indicate at the same time but there are number split up revenues (connections) for each recipient. IP multicast is generally utilized in the distribution of transmitted TV solutions over IP networks.
It significantly reduces the amount of bandwidth required to transmit high quality IPTV content across a network. This is because just a single copy of every video stream must be delivered to a hub, which often makes a duplicate of the supply for the requesting devices. Not only does multicast reduce steadily the bandwidth demands of the network however the running power of the Press host can also be held relatively minimal since it only transfers one replicate of an IPTV flow at a time.
Although the present 3G cellular network from AT&T and Verizon does not have IP multicast, but, another 3G mobile network update from both carriers might include the IP multicast feature. For AT&T Wireless, the next system upgrade will soon be HSPA (High Speed Package Access) which supports the MBMS (Multimedia Broadcast Multicast Services) feature. For Verizon Wireless, the next upgrade is likely to be EVDO Rev A which supports the BCMCS (Broadcast and Multicast Services) feature. Hence, the near future mobile TV support from both AT&T Wireless and Verizon Instant may use IPTV implementation.