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Multicasting already being used
Multicasting is already used for things like set-top box firmware updates and broadcast of electronic program guides (EPG) in the IPTV space. Kejriwal said that multicasting is a unidirectional, point-to-multipoint service like broadcasting, except that it can verify whether a receiver is a paying customer. Thus, users must have a receiver as well as a service account.

The initiatives taken for multicasting technology came from the need to have an alternative to digital broadcasting. Necessary steps have been taken to allow technology to accommodate streaming of content over 3G networks, to transmit in a specified-megahertz range.

All of this has been tried on platform requiring 30-50 times fewer towers than a cellular network.Kanjilal added that multicasting is used as a technology that is suitable for traffic distribution in the network backbone. Multicast is also used in the broadcast (i.e., receive only) in the mode. Only the cellular network is used for the return path for interacting back with the broadcast programs.

Mobile/IP TV security via Web technologies
Certain security standards have been adopted for mobile/IPTV as well. Reeder said that IPTV security is taken care of through a number of standard Web technologies such as firewalls, digital signatures and secure socket layers (SSL), while conditional access and DRM secures signed content for use on the set-top box. He said that ANT software contains all the typical browser style security features.

However, he pointed out that the system integrator or middleware company implements the full end-to-end security model for a given IPTV deployment. This combined client and server security model addressed typical attacks, such as denial of service, man in the middle attacks, and spoofing etc.

Rajan at Amino added: "It appears that most IPTV operators are conscious of the requirement for security measures (conditional access or DRM) to protect the content owners' property, and also ensure access to valuable, premium content. However, as yet, no one standard or preference has emerged. Fortunately, Amino has experience of working with all of the major CA vendors, so we are in a good position to both guide and support the operators in choosing and deploying appropriate security technology."

According to Cellnext's Kejriwal, the prevalent security standards as adopted by the channels and broadcasters will be relevant for video streaming on mobile. The application developer will enable the mobile handset to view the content of the broadcasters, which would have condensed or streamed live after thorough security checks at the broadcaster's end.

The operators will ensure that the video consumes defined bandwidth in the network, which is under their security standards. Nokia's Kanjilal said that a fully specified standard for service and content protection is being currently being specified in the DVB standard. "It builds on the OMA DRM, which is being updated to fit the needs of broadcast environment."

As for storage requirements for mobile TV, Kanjilal added that being a broadcast platform, storage would not be required as the content can be viewed in real time. Kejriwal said there are limits as to how much network capacity can be diverted away from phone calls and wireless Internet access. Just as they interfere with calls, gaps in network coverage may disrupt a TV feed. "From the device end, while screen quality has improved, TV presents a challenge in terms of battery life, processing power and storage requirements."



 
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