  We consider the problem of cache-aided interference management in a network
consisting of $K_{\mathrm{T}}$ single-antenna transmitters and $K_{\mathrm{R}}$
single-antenna receivers, where each node is equipped with a cache memory.
Transmitters communicate with receivers over two heterogenous parallel
subchannels: the P-subchannel for which transmitters have perfect instantaneous
knowledge of the channel state, and the N-subchannel for which the transmitters
have no knowledge of the instantaneous channel state. Under the assumptions of
uncoded placement and separable one-shot linear delivery over the two
subchannels, we characterize the optimal degrees-of-freedom (DoF) to within a
constant multiplicative factor of $2$. We extend the result to a decentralized
setting in which no coordination is required for content placement at the
receivers. In this case, we characterize the optimal one-shot linear DoF to
within a factor of $3$.
