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• W3119335964 abstract "The work establishes the exact performance limits of stochastic coded caching when users share a bounded number of cache states, and when the association between users and caches, is random. Under the premise that more balanced user-to-cache associations perform better than unbalanced ones, our work provides a statistical analysis of the average performance of such networks, identifying in closed form, the exact optimal average delivery time. To insightfully capture this delay, we derive easy to compute closed-form analytical bounds that prove tight in the limit of a large number $Lambda$ of cache states. In the scenario where delivery involves $K$ users, we conclude that the multiplicative performance deterioration due to randomness -- as compared to the well-known deterministic uniform case -- can be unbounded and can scale as $Thetaleft( frac{log Lambda}{log log Lambda} right)$ at $K=Thetaleft(Lambdaright)$, and that this scaling vanishes when $K=Omegaleft(Lambdalog Lambdaright)$. To alleviate this adverse effect of cache-load imbalance, we consider various load balancing methods, and show that employing proximity-bounded load balancing with an ability to choose from $h$ neighboring caches, the aforementioned scaling reduces to $Theta left(frac{log(Lambda / h)}{ log log(Lambda / h)} right)$, while when the proximity constraint is removed, the scaling is of a much slower order $Theta left( log log Lambda right)$. The above analysis is extensively validated numerically." @default.
• W3119335964 created "2021-01-18" @default.
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• W3119335964 date "2020-05-28" @default.
• W3119335964 modified "2023-09-27" @default.
• W3119335964 title "Fundamental Limits of Stochastic Shared Caches Networks" @default.
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• W3119335964 hasPublicationYear "2020" @default.
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