PROJECT TITLE :

Impact of Cell Association on Energy-Efficiency and Hit Rate of Femto-Caching

ABSTRACT:

The user experience is improved thanks to the caching of content at femto base stations (F-BSs). In actuality, the amount of storage space that F-BSs have is typically insignificant when compared to the size of the content library. Because of this, an efficient content placement strategy that takes into account user association (UA), networking issues, and the possibility of content retransmissions is required. The standard practice is to link user devices with the F-BS that is geographically closest to them and stores the content being requested; this is known as content-centric user association (CC-UA). We argue that CC-UA could lead to a decrease in hit rate as well as energy efficiency (EE), and we then propose three cache-agnostic UA schemes as a solution to this problem: baseline (CA-B), Macro-to-femto (CA-M2F), and femto-to-femto (CA-F2F) (CA-F2F). In CA-B, if the content that was requested could not be located in the cache, it would be retrieved using the backhaul. The performance is improved by the CA-M2F scheme thanks to the communication that takes place between Macro-BSs and F-BSs. In conclusion, the CA-F2F scheme implements the direct F2F communication paradigm, which makes it possible for F-BSs to exchange contents with one another on demand. We model and analyze all of these user authentication schemes with the assistance of stochastic geometry, and we derive the associated hit rate and EE performances based on the primary system parameters. After that, we make use of the analysis to study the performance of the UA-C schemes that were developed under a variety of (heuristic) probabilistic content placement strategies. The numerical results show that CA-F2F and CA-M2F perform significantly better than CC-UA and CA-B when a specific content placement strategy is compared to them. The margins of victory are significant. For instance, we have found that by utilizing CA-F2F rather than CC-UA, one is able to realize an increase in EE that is 1200 percent higher.