  Mobile edge caching/computing has been emerging as a promising paradigm to
provide new services (e.g., ultra-high rate, ultra-reliable, and/or low-latency
communications) in future wireless networks. In this paper, we introduce a
novel mobile edge caching network architecture that leverages the optimal joint
caching-delivering with horizontal cooperation among mobile edge nodes (MENs),
namely JOCAD. Under this architecture, MENs cooperate with each other in both
caching and delivering contents, aiming to simultaneously minimize the total
average delay for the mobile users and mitigate the network traffic on the
backhaul link. Extensive simulations demonstrate that the proposed solutions
can reduce the total average delay for the whole network up to 40% compared
with the most frequency-of-access policy, and up to 25% compared with locally
optimal caching policy (i.e., without collaboration). Furthermore, the proposed
solutions also increase the cache hit rate for the network by four times,
thereby dramatically reducing the traffic load on the backhaul network.
