Femtocaching and Device-to-Device Collaboration: A New Architecture for   Wireless Video Distribution
  We present a new architecture to handle the ongoing explosive increase in the demand for video content in wireless networks. It is based on distributed caching of the content in femto-basestations with small or non-existing backhaul capacity but with considerable storage space, called helper nodes. We also consider using the mobile terminals themselves as caching helpers, which can distribute video through device-to-device communications. This approach allows an improvement in the video throughput without deployment of any additional infrastructure. The new architecture can improve video throughput by one to two orders-of-magnitude. 
Negin Golrezaei, Andreas F. Molisch, Alexandros G. Dimakis, Giuseppe   Caire
cs.NI cs.IT math.IT