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Fundamental Limits on Delivery Time in Cloud- and Cache-Aided Heterogeneous Networks. (arXiv:1706.07627v1 [cs.IT])
来源于:arXiv
A Fog radio access network is considered as a network architecture candidate
to meet the soaring demand in terms of reliability, spectral efficiency, and
latency in next generation wireless networks. This architecture combines the
benefits associated with centralized cloud processing and wireless edge caching
enabling primarily low-latency transmission under moderate fronthaul capacity
requirements. The F-RAN we consider in this paper is composed of a centralized
cloud server which is connected through fronthaul links to two edge nodes
serving two mobile users through a Z-shaped partially connected wireless
network. We define an information-theoretic metric, the delivery time per bit
(DTB), that captures the worst-case per-bit delivery latency for conveying any
requested content to the users. For the cases when cloud and wireless
transmission occur either sequentially or in parallel, we establish coinciding
lower and upper bounds on the DTB as a function of cache size, backhaul
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