The system considered foresees a multi-spot beam coverage of a target area as satellite system. A multi gateway distribution network is then distributing content to a large population of broadcast receivers within the multi-spot beam coverage. The return path from the end users is considered optional and the protocols are designed to be compatible with both a unicast only and an optional return path, which can be terrestrial, or satellite based. The considered protocols for the video and file distributions are based on standardised mechanisms, such as MPEG-DASH and FLUTE.
Regarding use cases, the application for end users is considered with and without return paths either over satellite or terrestrial return paths. However, the compatibility with a unicast receiver is considered mandatory also.
The following figures illustrate the two key use cases of first a local CDN caching for residential end users and a CDN reception at the edge node of a local terrestrial network, for example a terrestrial wireless base station (e.g. 4G, 5G) or a terrestrial redistribution network.
Figure 1: Content receiver at a residential home.
Figure 2: Content distribution and caching in the home environment.
Figure 3: Satellite CDN network with local node based caching with local redistribution of the content.