Spectrum Sharing and Power Allocation Optimised Multihop Multipath D2D Video Delivery in Beyond 5G Networks

In this paper, we propose a joint spectrum and
power optimisation (SPO) for multi-hop multi-path (MHMP)
device-to-device (D2D) video delivery in beyond 5G (B5G/6G)
networks, where the system resources such as spectrum, energy,
storage, and content of mobile users (MUs), are taken into
account. Particularly, the downlink spectrum resources of the
sharing users (SUs) are reused by the transmitters (TXs) of
D2D hops and the energy resources of the TXs are utilised for
D2D communications. We further exploit the videos stored in
the caching users (CUs) located more than one D2D hop far
away from the requesting users (RUs) to establish MHMP D2D
video delivery sessions from the CUs to the RUs. Then, the SPO
problem is formulated for the optimal spectrum sharing pairs of
SUs and TXs and the optimal transmission powers allocated to
the TXs. Genetic algorithms (GAs) are developed to solve the SPO
problem with respect to both binary variable (spectrum sharing)
and real variable (power allocation). The SPO solution allows the
RUs to alternately request the videos not only from the macro
base station over conventional cellular networks but also from the
CUs over MHMP D2D communications at the highest quality of
service, i.e., maximum video delivery capacity and low power
consumption. Simulation results are analysed to demonstrate the
feasibility of GAs and the benefits of the proposed SPO solution
in comparison with other conventional schemes