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Combination Networks with or without Secrecy Constraints: The Impact of Caching Relays. (arXiv:1712.04930v1 [cs.IT])
来源于:arXiv
This paper considers a two-hop network architecture known as a combination
network, where a layer of relay nodes connects a server to a set of end users.
In particular, a new model is investigated where the intermediate relays employ
caches in addition to the end users. First, a new centralized coded caching
scheme is developed that utilizes maximum distance separable (MDS) coding,
jointly optimizes cache placement and delivery phase, and enables decomposing
the combination network into a set virtual multicast sub-networks. It is shown
that if the sum of the memory of an end user and its connected relay nodes is
sufficient to store the database, then the server can disengage in the delivery
phase and all the end users' requests can be satisfied by the caches in the
network. Lower bounds on the normalized delivery load using genie-aided cut-set
arguments are presented along with second hop optimality. Next recognizing the
information security concerns of coded caching, this new model is 查看全文>>