  The large amount of deployed smart devices put tremendous traffic pressure on
networks. Caching at the edge has been widely studied as a promising technique
to solve this problem. To further improve the successful transmission
probability (STP) of cache-enabled cellular networks (CEN), we combine the
cooperative transmission technique with CEN and propose a novel transmission
scheme. Local channel state information (CSI) is introduced at each cooperative
base station (BS) to enhance the strength of the signal received by the user. A
tight approximation for the STP of this scheme is derived using tools from
stochastic geometry. The optimal content placement strategy of this scheme is
obtained using a numerical method to maximize the STP. Simulation results
demonstrate the optimal strategy achieves significant gains in STP over several
comparative baselines with the proposed scheme.
