3G mobile systems, through the increase in available bandwidth, offer new possibilities and services. One of these new
services will be the ability to stream sound and movies to mobile devices.
Streaming is a mechanism whereby media content can be rendered at the same time that it is being transmitted to the
client over the data network.
Streaming services are required whenever instant access to multimedia information needs to be integrated into an
interactive media application. This has to be seen in contrast to other multimedia services like for instance MMS where
multimedia content is delivered to the user asynchronously by means of a 'message'.
Interactive applications that use streaming services include on-demand and live information delivery applications.
Examples of the first category are music, music videos and news-on-demand applications. Live delivery of radio and
television programs are examples of the second category, this could e.g. make it possible to listen to domestic radio
A web server works with requests for information, it delivers that particular information as fast as possible, completes
the transaction, disconnects and goes on to other requests. A client connects to a web server only when it needs
information. This strategy works well as long as pictures and text are to be received. If a client wants to watch video or
listen to audio, the entire file must be received before it can be played. The problem is that these kinds of files can be
very large thus potentially causing storage problems in the client and resulting in long start-up latency. A streaming
service improves this by allowing the media to be consumed as it is received, thereby reducing the latency and
removing the need to store the media.
In addition to providing the streaming mechanism the PSS also encompasses the composition of media objects thereby
allowing compelling multimedia services to be provisioned. For instance, a mobile cinema ticketing application would
allow the user to view the film trailers.