Exploiting Caching and Multicast for 5G Wireless Networks - 2016


The landscape toward 5G wireless communication is currently unclear, and, despite the efforts of academia and business in evolving traditional cellular networks, the enabling technology for 5G continues to be obscure. This paper puts forward a network paradigm toward next-generation cellular networks, targeting to satisfy the explosive demand for mobile information whereas minimizing energy expenditures. The paradigm builds on two principles; namely caching and multicast. On one hand, caching policies disperse widespread content files at the wireless edge, e.g., pico-cells and femto-cells, hence shortening the distance between content and requester. On alternative hand, due to the broadcast nature of wireless medium, requests for identical files occurring at nearby times are aggregated and served through a common multicast stream. To higher exploit the on the market cache house, caching policies are optimized primarily based on multicast transmissions. We show that the multicast-aware caching downside is NP-exhausting and develop solutions with performance guarantees using randomized-rounding techniques. Trace-driven numerical results show that in the presence of large demand for delay tolerant content, combining caching and multicast can indeed reduce energy costs. The gains over existing caching schemes are nineteenp.c when users tolerate delay of three minutes, increasing additional with the steepness of content access pattern.

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