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Caching at base stations (BSs) is a promising approach for supporting thetremendous traffic growth of content delivery over future small-cell wirelessnetworks with limited backhaul. This paper considers exploiting spatial cachingdiversity (i.e., caching different subsets of popular content files atneighboring BSs) that can greatly improve the cache hit probability, therebyleading to a better overall system performance. A key issue in exploitingspatial caching diversity is that the cached content may not be located at thenearest BS, which means that to access such content, a user needs to overcomestrong interference from the nearby BSs; this significantly limits the gain ofspatial caching diversity. In this paper, we consider a joint design offrequency reuse and caching, such that the benefit of an improved cache hitprobability induced by spatial caching diversity and the benefit ofinterference coordination induced by frequency reuse can be achievedsimultaneously. We obtain a closed-form characterization of the approximatesuccessful transmission probability for the proposed scheme and analyze theimpact of key operating parameters on the performance. We design alow-complexity algorithm to optimize the frequency reuse factor and the cachestorage allocation. Simulations show that the proposed scheme achieves a highersuccessful transmission probability than existing caching schemes.

Joint Frequency Reuse and Cache Optimization in Backhaul-Limited Small-Cell Wireless Networks