Research On Resource Allocation Algorithms Of Full-duplex Device-to-Device Communications Underlaying Cellular Networks

Co-time Co-frequency Full-duplex(FD)technology is one of the key technologies of the fifth-generation(5G)mobile communications networks,which can double the spectrum efficiency in theory.Applying it to a Device-to-Device(D2D)communication underlaying cellular networks can further improve the spectrum efficiency of the system.At the same time,the introduction of FD technology makes the co-channel interference under cellular D2D resource sharing more complicated.How to design interference control technology based on resource allocation is the focus of this thesis.Therefore,the thesis focuses on the interference problem of the FD D2D communication underlaying cellular networks,and mainly focus in the following two aspects:Firstly,a power control algorithm based on maximizing the total throughput of the communication system is proposed.In a one-to-multiple multiplexing scenario where multiple pairs of FD D2D users share the same spectrum resources with an uplink cellular user,under the premise of ensuring the minimum transmission rate requirements of cellular users and D2D users,a power control optimization problem is proposed to maximize the total throughput for cellular users and D2D users.Aiming at the proposed non-convex optimization problem,this article employs the monotonic optimization theory to solve the problem by introducing slack variables.Then the optimization problem is transformed into a monotonic optimization problem for solution.The simulation results show that the proposed power control algorithm can further improve the total throughput of the system.Secondly,a resource allocation algorithm based on joint channel allocation and power control to maximize the total sum throughput of cellular users is proposed.In a scenario where multiple pairs of FD D2D users coexist with multiple uplink cellular users,an optimization problem with the goal of maximizing the total sum throughput of cellular users is constructed under the premise of ensuring the minimum transmission rate requirement of D2D users.For this nonconvex optimization problem,the algorithm considers the channel state information between D2D users as a measure of interference strength,and groups D2D users with the objective of minimizing the interference strength,and optimizes the transmission power of D2D users and cellular users to maximize the transmission rate of cellular users.Finally,with the goal of maximizing the total sum throughput of cellular users in the system,the D2D user group is allocated its multiplexed cellular users to complete the channel allocation.The results show that compared to the existing research,the algorithm proposed in this paper can achieve a higher throughput for cellular user.In conclusion,the resource allocation algorithm proposed for the FD D2D communication underlaying cellular networks in this thesis can effectively reduce the interference of the system,increase the transmission rate of the cellular system,and provide technical support for the future application of FD communication technology and D2D communication technology.