“…In the respect of network virtualization architecture based on caching, the proposed architectures include service based [12,13,[15][16][17], application based [13,[18][19][20], MVNO (mobile virtual network operator) based [13,16,20,21], access network [13,15] and/or core network based [22], and different physical layer resource based [8]. In the respect of optimization of virtual wireless network resources based on content-oriented caching, since slicing on a wireless network involves how to assign resources to different slices, which can be transformed into the optimization problem for various optimization objectives, the resources of network slicing can be the available radio spectrum (divided also by time, frequency, or space), wireless network infrastructures, the available transmission time, or the capacity of the medium [8], while content-oriented optimization objects diverse in network-centric objectives and user-centric objectives, and the optimization also depends on the network architecture [23], the state-ofthe-art research issues on optimization of virtual wireless network resources based on content caching are investigated, and several research issues concentrate on network slicing optimization integrating network function virtualization and in-network caching.…”