The Performance Research Of LTE-A Cellular Network Based On Relay And Device-to-Device Technology

In recent years, mobile communication technology has developed rapidly, people have higher and higher requirement for the quality of communication, service demand, tend to be diversified and complicated. For LTE-A cell edge regions such as the communication problem of low quality, introducing the relay technology, on the basis of the existing wireless network, relay technology can extend coverage, improve communication quality in hot spots. D2 D technology can use the increasingly scarce spectrum resources efficiently, unload station’s traffic and ease the burden, improve the utilization efficiency of communication system th roughput and frequency band. Using layer 3 relay‘s characteristics of wireless resource management, make the relay technology and D2 D direct users, D2 D pass-through, cellular users build communication network, research on the communication system of different pattern configuration throughput.This paper considers the research background of the LTE-A cell which is combined with relay technology and D2 D technology at the same time, to study and analysis on the system communication performance. Based on LTE-A relay of cellular network system architecture and link model, and the working principle of D2 D technology and communication mode, respectively consider D2 D pass-through(cellular) mode, the D2 D pass-through(reuse) model combined with LTE-A relay cellular network, respectively consider D2 D undirected model(relaying mode), D2 D directed model(reuse model) combined with LTE-A relay cellular network, set up two classes of system model, analyzing the communication process, then building the system throughput as the optimization objective function of the MINLP problem. Prove that the conditions satisfying the convex optimization objective function and constraints, and then using the method of Lagrange dual to solve the problem. Through theoretical derivation and simulation analysis, found that the different D2 D communication mode combined with relay in LTE-A cellular network, there are significant differences in terms of throughput and fairness. On the basis of the above two models, set up the relay technology system model with two D2 D communication mode aim to optimize the system throughput, Due to this problem is a non-convex problem, using genetic algorithm to solve it, analyze and compare the effect on the throughput of the system with different network scenarios parameters.