SVTA2104: Open Casting Use Cases and Requirements

Delegating content delivery to a downstream Content Delivery Network (CDN), typically
operated and exposed by a telecom operator, provides a quality of experience
enhancement, as the physical distance from the client to the cache server is shortened. However, this does not eliminate the possibilities for problems. In cases of massive/large events, or simply a high level of concurrent usage, the downstream CDN may experience overloading. Exposing and offering a multicast delivery service, possibly in conjunction with the unicast CDN, is a win/win model that reduces the pressure on the Downstream CDN (dCDN) and offers a better quality of experience (scalable delivery) for the Upstream CDN (uCDN).

This document specifies the use cases that would benefit from such an open/shared
multicast delivery service and provides a list of requirements addressed by [SVTA2065].