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The correlation among the content distributed across a cache-aided broadcastnetwork can be exploited to reduce the delivery load on the shared wirelesslink. This paper considers a two-user three-file network with correlatedcontent, and studies its fundamental limits for the worst-case demand. A classof achievable schemes based on a two-step source coding approach is proposed.Library files are first compressed using Gray-Wyner source coding, and thencached and delivered using a combination of correlation-unaware cache-aidedcoded multicast schemes. The second step is interesting in its own right andconsiders a multiple-request caching problem, whose solution requires coding inthe placement phase. A lower bound on the optimal peak rate-memory trade-off isderived, which is used to evaluate the performance of the proposed scheme. Itis shown that for symmetric sources the two-step strategy achieves the lowerbound for large cache capacities, and it is within half of the joint entropy oftwo of the sources conditioned on the third source for all other cache sizes.

Broadcast Caching Networks with Two Receivers and Multiple Correlated Sources