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Repair of multiple partially failed cache nodes is studied in a distributedwireless content caching system, where $r$ out of a total of $n$ cache nodeslose part of their cached data. Broadcast repair of failed cache contents atthe network edge is studied; that is, the surviving cache nodes transmitbroadcast messages to the failed ones, which are then used, together with thesurviving data in their local cache memories, to recover the lost content. Thetrade-off between the storage capacity and the repair bandwidth is derived. Itis shown that utilizing the broadcast nature of the wireless medium and thesurviving cache contents at partially failed nodes significantly reduces therequired repair bandwidth per node.

Storage-Repair Bandwidth Trade-off for Wireless Caching with Partial Failure and Broadcast Repair