Non-orthogonal multiple access (NOMA) based

wireless caching network (WCN) is considered as one of the most

promising technologies for next-generation wireless communications

since it can significantly improve the spectral efficiency.

In this paper, we propose a quality of service (QoS)-oriented

dynamic power allocation strategy for NOMA-WCN. In content

stack phase, the base station sends multiple files to the content

servers by allocating different powers according to the different

QoS targets of files, for ensuring that all content servers can

successfully decode the two most popular files. In content deliver

phase, the content servers serve two users at the same time

by allocating the minimum power to the far user according

to the QoS requirement, and then all the remaining power is

allocated to the near user. Hence, the proposed power allocation

scheme is able to increase the hit probability and drop the outage

probability compared with conventional method. Simulation

results confirm that the proposed power allocation method can

significantly improve the caching hit probability and reduce the

user outage probability. It is also shown that this strategy can

reduce the user delay time, improve the system efficiency and

the capacity.