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Maddah-Ali and Niesen, in a seminal paper, introduced the notion of codedcaching. The exact nature of the fundamental limits in this context hasremained elusive even as several approximate characterizations have been found.A new optimal scheme for the (3, 3) cache network, operating at the memory ratepair (5/3, 1/2) for the demand where all the users request for distinct files,was introduced recently to partially address this issue. In this paper, anextension of this scheme to the general (K, K) cache network, operating at thememory rate pair (K-1-1/K, 1/(K-1)), is proposed. A new lower bound is alsoderived which demonstrates the optimality of the proposed scheme for the demandwhere all the users request for distinct files.

Fundamental Limits of Coded Caching: The Memory Rate Pair (K-1-1/K, 1/(K-1))