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QoS-Oriented Dynamic Power Allocation in NOMA-based Wireless Caching Networks

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posted on 2020-04-16, 08:25 authored by Yue Yin, Miao Liu, G G, Haris Gacanin, Fumiyuki Adachi
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.


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in IEEE Wireless Communications Letters