Energy Efficient D2D Mode Selection Mechanism:A Stochastic Geometry Approach

As one of the key technologies of the 5th generation mobile communication,D2D(Device-to-Device)communication has received extensive attention from academia and industry.However,the development of D2 D communication also faces many difficulties and challenges,among which the co-channel interference is large,and the terminal energy consumption is particularly prominent.The mode selection is the most direct and effective means to effectively deal with the above two challenges.Although the industry has made some progress in the research of D2 D mode selection,most of these results are inconsistent with the actual situation.The specific performances are as follows: 1)Some work hypotheses D2 D communication small-scale fading for Rayleigh fading,regardless of the communication mode.It is means that the D2 D communication distance is assumed to be non-line-of-sight;2)part of the study assumes that the distance between the transmitting and the receiving is constant;3)most documents assume that the same type of user has the same transmit power,such as all cellular users(D2D users)have the same transmit power.To this end,this thesis proposes " Energy Efficient D2 D Mode Selection Mechanism: A Stochastic Geometry Approach".The main work is as follows:(1)Establish a system model for multi-cell D2 D communication mode selection.Compared with the existing research,the model specifies that the communication distance between the transmitting and the receiving is a random variable,and the line-of-sight or non-line-of-sight distinction is performed on the small-scale fading in different D2 D communication modes according to the distance.(2)Based on the model selection system model,the success probability,the ergodic capacity and the energy efficiency analytical expression of cellular links and D2 D links in different modes are obtained by using stochastic geometry,and the mode selection mechanism based on system energy efficiency is designed.(3)To extended mode selection system model and proposes a power stratification strategy.In this strategy,the transmit power is different when different layers of the same type of user.Under this condition,a mode selection mechanism based on power stratification is designed,reduce equipment energy consumption.Simulation experiments show that the outer user is far away from the base station than the inner user,but the outer user communication success rate is higher than the inner user.(4)Starting from the reduction of terminal energy consumption,Simultaneous Wireless Information and Power Transfer(SWIPT)was introduced to propose a D2 D communication mode selection mechanism based on SWIPT,which is highly efficient.Simulation experiments show that D2 D communication has the highest energy efficiency in the reuse mode.In summary,this paper studies the D2 D mode selection mechanism in depth,establishes the system model under the premise of engineering practice hypothesis,proposes a layered strategy to solve the problem of the same transmit power,and combines the coupling characteristics of SWIPT and D2 D communication technology.The terminal energy can be fully and effectively utilized to lay a theoretical foundation for promoting the development of D2 D mode selection.