Relay Selection And Data Distribution Mechanism Research Under D2D Multicast Communication Scenario

With the continuous development of communication technology, modern society all over the world contact more closely than ever before, timely and effective information interaction is more and more important for people. The continuous development of high-speed wireless multicast multimedia business requires greatly improvement on the carrying capacity of network, brought the huge challenge to the existing wireless communication system. Improve the efficiency of resource utilization for multicast communication, reduce system energy consumption has become the important hot topic in the field of communications. In addition, the open characteristic of wireless communication makes them more vulnerable to eavesdroppers malicious eavesdropping, therefore, ensure that the user communication data security has become one of the current research hotspots.D2D multicast communication as a new technology of short distance transmission, has huge potential to improve the efficiency of resource utilization for multicast communication, reduce system energy consumption and protect user data security. The purpose of this paper is to explore a D2D multicast communication scenarios relay selection and data distribution mechanism, the main research content and innovation are as follows:In the D2D multicast communication scenarios, considering the D2D terminal equipment of the channel state and residual energy, the D2D multicast communication optimal relay selection is put forward based on the subgrouping. Through grouping D2D users effectively, the optimal relay selection algorithm is given to minimize the total energy consumption of the system. The algorithm can obtain a good system in energy consumption at the same time guarantee the equality of the equity between users, and prolong the survival of the whole network.Then consider the presence of the eavesdropper D2D multicast communication scenarios, on the basis of the study of the existing physical layer security, according to the characteristics of the D2D communication technology, puts forward the D2D multicast data distribution mechanism for safety. Considering the safety of system, the residual energy of equipment and fairness, through the retransmission to legitimate user manual noise added to the signal at the same time, by building the zero space or the time reversal technology to interference of eavesdropper, make its can’t steal useful information. In the case of ensure safe transport system at the same time realize the system energy consumption is reduced, the fairness of give attention to two or more things, increased the survival time of the network.