1 research outputs found
Analysis of Cached-Enabled Hybrid Millimter Wave & Sub-6 GHz Massive MIMO Networks
This paper focuses on edge caching in mm/{\mu}Wave hybrid wireless networks,
in which all mmWave SBSs and {\mu}Wave MBSs are capable of storing contents to
alleviate the traffic burden on the backhaul link that connect the BSs and the
core network to retrieve the non-cached contents. The main aim of this work is
to address the effect of capacity-limited backhaul on the average success
probability (ASP) of file delivery and latency. In particular, we consider a
more practical mmWave hybrid beamforming in small cells and massive MIMO
communication in macro cells. Based on stochastic geometry and a simple
retransmission protocol, we derive the association probabilities by which the
ASP of file delivery and latency are derived. Taking no caching event as the
benchmark, we evaluate these QoS performance metrics under MC and UC placement
policies. The theoretical results demonstrate that backhaul capacity indeed has
a significant impact on network performance especially under weak backhaul
capacity. Besides, we also show the tradeoff among cache size, retransmission
attempts, ASP of file delivery, and latency. The interplay shows that cache
size and retransmission under different caching placement schemes alleviates
the backhaul requirements. Simulation results are present to valid our
analysis