In today’s highly competitive environment, users
have the option of choosing from a plethora of
carriers. Therefore, it is not enough to simply
make services available to users. Mobile carriers
must deliver those services in such a way that
users fully enjoy a rich experience at a reasonable
price. In this section we discuss the key
technologies used by mobile carriers for video
chat. Mobile carriers are responsible for end-to end
seamless connectivity of video chat application.
Video chat applications demand strict QoS.
As mentioned before, it requires packet delay £
150 ms and bandwidth requirement > 100 kb/s.
The frame error rate needs to be £ 1 percent [5].
Therefore, continuous feedback is required
between the network and the video chat controller
(Fig. 2) for balancing between network
conditions and end users’ video chat expectations.
We now focus our discussion on network
architecture relevant to video chat.