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Caching in multi-cell networks faces a well-known dilemma, i.e., to cachesame contents among multiple edge nodes (ENs) to enable transmissioncooperation/diversity for higher transmission efficiency, or to cache differentcontents to enable content diversity for higher cache hit rate. In this work,we introduce a partition-based caching to exploit the tradeoff betweentransmission diversity and content diversity in a multi-cell edge cachingnetworks with single user only. The performance is characterized by the systemaverage outage probability, which can be viewed as the sum of the cache hitoutage probability and cache miss probability. We show that (i) In the lowsignal-to-noise ratio(SNR) region, the ENs are encouraged to cache morefractions of the most popular files so as to better exploit the transmissiondiversity for the most popular content; (ii) In the high SNR region, the ENsare encouraged to cache more files with less fractions of each so as to betterexploit the content diversity.

Exploiting Tradeoff Between Transmission Diversity and Content Diversity in Multi-Cell Edge Caching