Optimization Resource Allocation Based On Comprehensive Power Efficiency In LTE-D2D Network

With the gradual development of mobile multimedia communication technology, mobile communication technology, which attracts the attention of researchers as a promising and challenging technology, is becoming more and more urgent to pursue higher data transmission rate, stronger communication service ability and wider mobile communication range. D2 D communication refers to the direct communication between two adjacent mobile devices without a base station or an access point, with which introduced into LTE network, the system's spectrum utilization and data transmission rate can be improved, and the load of the base station and the power consumption of communication device can be reduced. In addition, the battery life of communication device can be improved. The technologies of link enhancement in D2 D communication are introduced in details, which include adjacent discovery, interference management, power control, mode selection and resource allocation.This paper mainly explores the characteristics of D2 D communication technology based on LTE network in terms of resource allocation. Firstly, several existing resource allocation strategies are introduced, including the strategy of interference minimization from D2 D to base station, the strategy of system capacity maximization, the strategy of system power consumption minimization, and the strategy of power efficiency maximization for D2 D unit. With the optimization objective of power efficiency maximization, the resource allocation algorithm of two point iteration of power is analyzed. Secondly, the resource allocation algorithm of optimal SINR incremental iteration is proposed, which is independent of any specific utility functions, selectively increases the SINR of device, and makes the utility function gradually approaching the optimal solution. Taking the strategy of power efficiency maximization for D2 D unit as an example, the effect of performance of two resource allocation algorithms is verified by Matlab simulation.Mainly from the perspective of interference, power consumption, or system capacity, the existing resource allocation strategies achieve the goal of reducing the mutual interference between D2 D and cellular communication links and the maximum system capacity. However, power consumption and system capacity are important measures of the cellular system. The maximum system capacity with the minimum power consumption is what we need. In this paper, from the perspective of power efficiency, which means the ratio of the capacity and the power consumption, resource allocation strategy for D2 D communication in cellular networks has been analyzed.Considering Power efficiency of single D2 D communication device, comprehensive consideration should be taken into, including both user power efficiency and system power efficiency. From the user's point of view, a resource allocation strategy of guaranteeing minimum power efficiency is proposed. Furthermore, combined with the definition of D2 D basic unit power efficiency, a resource allocation strategy based on comprehensive power efficiency is proposed. Through simulation experiments, the influence of the distance between the D2 D transmitting device and the base station, and the ratio of the utility function to the performance of the strategy, are studied. The effectiveness of the comprehensive utility function is analyzed. At last, the rationality and validity of the resource allocation strategy based on the comprehensive power efficiency are verified by simulation comparison with other resource allocation strategies.