Potential mechanisms for Circuit Switched (CS) domain video and voice service improvements
This TR studies different mechanisms which might permit 3GPP based systems to rapidly enhance their customers Circuit Switched Videotelephony experience.
Many operators regard circuit video services as a key part of UMTS. However there is a strong desire to have an effective and user friendly method of switching between voice and video services when the user desires and/or when radio conditions change and video mode is no longer available. There are several situations where swapping between video and voice calls is needed.
Within the TR, different mechanisms are described along with their characteristics. A comparison of the pros and cons of the different mechanisms is included.