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An emerging trend of next generation communication systems is to providenetwork edges with additional capabilities such as storage resources in theform of caches to reduce file delivery latency. To investigate the impact ofthis technique on latency, we study the delivery time of a cache-aidedbroadcast-relay wireless network consisting of one central base station, $M$cache-equipped transceivers and $K$ receivers under finite precision channelstate information (CSI). We use the normalized delivery time (NDT) to capturethe worst-case per-bit latency in a file delivery. Lower and upper bounds onthe NDT are derived to understand the influence of $K,M$, cache capacity andchannel quality on the NDT. In particular, regimes of NDT-optimality areidentified and discussed.

Delivery Time Minimization in Cache-Assisted Broadcast-Relay Wireless Networks with Imperfect CSI