Research On Interference Control Of D2D Communication System In LTE Network

With the development of communication technologies, wireless communication has experienced from the first generation which represented by voice business of mobile phone system, to the continued evolution of the current large-scale commercial fourth-generation(4G) mobile data, mobile computing and mobile multimedia as the representative of wireless broadband systems. The current phase,with the rapid popularization of intelligent terminal as well as the rapid growth of the network communication capacity. Evolution of demand for 5G wireless communication technology is also more urgent, began to be the great concern of the industry.The rapid development of wireless mobile communication, although attracted a growing number of mobile users, brought operators new business opportunities,however, as the customers’ demand is higher and higher, it also brings many pressures and challenges for operators. On the one hand, the traditional wireless communication performance indicators, such as network capacity and spectrum efficiency requires continuous improvement to further increase the limited and tension increasingly wireless spectrum utilization, on the other hand, richer communication mode and end users’ experience as well as the expansion of the cellular communications applications also need to be considered. As the key candidate technology of future5 G,D2D(D2D:Device-to-Device)communication has achieved the data directly trans--mission between the terminals, it also can save spectrum resources, increase network capacity, reduce energy consumption of the terminal, shorten the time delay, etc. This article discusses and analyzes the interference coordination problem and power control problem after introducing D2 D communication into LTE network, the main contents are as follows:For the interference problem of D2 D communication in single-cell, propose a relay selection algorithm that based on optimal capacity. The algorithm firstly get the outage probability of the communication by set a reasonable SINR for base station and D2 D receiver, secondly, according to interrupt probability analysis obtain the relay trigger condition of D2 D communication, finally for D2 D communication which meet the relay trigger condition, select the best relay based on the optimal capacity in the collection that consist of K candidate relays. Simulation results show, comparedwith conventional cellular communication, D2 D communication with the relay can make full use of idle cell resources to effectively improve the user capacity, so as to enhance system performance.In order to research the performance of D2 D communication in multi-cell cellular systems, this paper proposed a dynamic power control algorithm based on interference restricted area to solve the interference problem between D2 D communication and cellular communication in multi-cell. First we use Laplace Transform to quantitative analyze the interference, then based on the analyze of outage probability and area spectral efficiency, through system-level simulation,research the impact of D2 D user equipment density, D2 D communication distance and different interference restricted area sizes on outage probability and area spectral efficiency. Simulation results shows that interference restricted areas can effectively reduce communication outage probability, improve system area spectral efficiency.