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This paper studies caching in (K+L-1) x K partially connected wireless linearnetworks, where each of the K receivers locally communicates with L out of theK+L-1 transmitters, and caches are at all nodes. The goal is to design cachingand delivery schemes to reduce the transmission latency, by using normalizeddelivery time (NDT) as the performance metric. For small transmitter cache size(any L transmitters can collectively store the database just once), we proposea cyclic caching strategy so that each of every L consecutive transmitterscaches a distinct part of each file; the delivery strategy exploits codedmulticasting and interference alignment by introducing virtual receivers. Theobtained NDT is within a multiplicative gap of 2 to the optimum in the entirecache size region, and optimal in certain region. For large transmitter cachesize (any L transmitters can collectively store the database for multiplecopies), we propose a modified caching strategy so that every bit is repeatedlycached at consecutive transmitters; the delivery strategy exploitsself-interference cancellation and interference neutralization. By combiningthese schemes, the NDT is optimal in a larger region. We also extend ourresults to linear networks with heterogeneous receiver connectivity andpartially connected circular networks.

Cache-Aided Interference Management in Partially Connected Linear Networks