Research On D2D Resource Allocation And Interference Management Strategy

With the rapid development of mobile communication,the requirements of the mobile communication system are also getting higher and higher due to the rapid increase in the rate of demand,in addition,the shortage of spectrum resources also limits the capacity to further enhance.In order to reduce network congestion and enhance network coverage,resource reuse and interference control has great practical significance for ensuring users fast and reliable service.Device-to-Device(D2D)communication is a communication technology that enables direct communication between end users without the need for base station forwarding,allowing users to experience faster data transfer speeds.The D2 D can further enhance the spectrum by reusing cellular resources effectiveness.This paper focuses on the interference scenarios of D2 D reused multiple cellular resources,and makes a detailed study on the fairness and capacity of D2 D communication resource allocation in existing LTE networks.The main work of this paper is as follows:(1)In the single-cell cellular network,considering the situation of multi-D2 D users sharing multi-cellular resources,the fairness of D2 D users is pursued in the case of ensuring the demand rate of cellular users,in which the co-channel interference exists among D2 D users.In order to maximize the fairness of D2 D users,this paper proposes a D2 D power allocation algorithm based on maximum and minimum fairness.First,the non-convex optimization problem was transformed into a Difference between Convex functions(DC)programming problem,then was used the global optimization algorithm of convex approximation and the bisection algorithm to achieve power optimization of D2 D.The simulation results show that the algorithm converges and improves the rate of bottlenecks.(2)Considering the problem of D2D resource allocation in cell using FFR,this paper proposes a resource allocation scheme based on spectrum priority for the interference between D2 D users in the case of more D2 D users.The scheme coordinates the inter-cell interference by assigning different priorities to the frequency resources,and avoids the interference between the D2 D link and the cellular link and the D2 D link between the cells,thus improv es the system performance.The simulation results show that the scheme improves the system throughput and improves the service quality of cellular users at the cell edge.