| Satellite Downlink Services: The satellite downlink | | | | too. With the satellite services, the people have |
| services work exactly opposite to the satellite | | | | been facilitated to get more advanced services |
| uplink services, where the frequency signals are | | | | wherein they can know the happenings of even |
| sent from the satellite, unlike satellite uplink | | | | the other parts of the world just by sitting at |
| services where the frequency signals are sent to | | | | home. |
| the satellite. The satellite downlink services get the | | | | Satellite broadcast is an important candidate for |
| signals from the satellite, which is received by a | | | | large-scale multimedia information distribution due |
| dish down on Earth, which are further converted | | | | to the inherent wide-range multicasting capability |
| into the compatible frequencies and further to the | | | | of satellites and the asymmetry of satellite |
| digital signals. These signals are then used by the | | | | communications (high bandwidth downlink, limited |
| electronic gadget for which the signals are being | | | | bandwidth uplink) that matches nicely the |
| sent. | | | | information flow asymmetry in multimedia |
| Satellite uplink and downlink services are mostly | | | | applications. We consider a data broadcasting |
| useful for the people who stay in the remote | | | | model that is encountered in most asymmetric |
| areas, away from the town or city areas. With | | | | satellite communication environments. The |
| the wireless technology, it becomes much easier | | | | problem of scheduling the data broadcast such |
| for the people staying in the remote areas to get | | | | that average response time experienced by the |
| the mode of communication easily.satellite uplink | | | | users is low is considered. In a push-based |
| and downlink services are provided to the people | | | | system, where the users cannot place requests |
| at large, the cost of production goes down and | | | | directly to the server and the broadcast schedule |
| these services become much cheaper than the | | | | should be determined based solely on the access |
| other communication and entertainment services. | | | | probabilities, we formulate a deterministic dynamic |
| And thus, become more affordable for the people | | | | optimization problem, the solution of which |
| at large. | | | | provides the optimal broadcast schedule. |
| There are a huge variety of satellite services, but | | | | Properties of the optimal solution are obtained and |
| how satellites transmit the single through channel it | | | | then we propose a suboptimal dynamic policy |
| important to understand. There are quite a series | | | | which achieves average response time close to |
| of satellite services that are available, which can | | | | the lower bound. In a pull-based system where |
| be used using different gadgets like televisions, | | | | the users may place requests about information |
| radios, computers, laptops and so forth. | | | | items directly to the server, the scheduling can be |
| Satellite services are one of the most advanced | | | | based on the number of pending requests for |
| parts of the technology development that have | | | | each item. |
| made the lifestyle of the people very advanced | | | | |