Research On Resource Management Of Device-to-device For 5G Systems

To meet the increasingly communications needs in the future,the 5G has become a hot research field.However,the main contradiction is still that the communication resource utilization and the scarcity of spectrum resources.Device to device communication is a technique of terminal direct communication using cellular resources and it is in the control of cellular system.D2D communications can effectively improve the spectrum efficiency and share the load pressure of base station by reusing the existing spectrum resources.So it can alleviate the problem of spectrum scarcity to a certain degree.The intereference between D2D UEs and cellular UEs is inevitable because the resources D2D communication using is the licensed frequency band of cellular network.Furthermore,how to combine the D2D communication and carrier aggregation effectively is to be solved.This paper proposes solution to the above problems.This thesis proposed a resource allocation method for D2D communication based on area division.First,a zoning method was defined taking the coverage of sector antennas and beamforming into consideration.A cell can be divided into several regions.Based on the zoning method,the eNB can determine whether UEs belong to the same region and uniformly allocate resources for users with the considition of the distance.Moreover,this method can allocate resource for users using the same resource.With this scheme,not only the interference between D2D pairs can be reduced,but also that between D2D users and cellular users.This thesis proposed a method of assigning CC(component carriers)for D2D communication based on CA(carrier aggregation).This method defines the SelectableD2DCCList,D2DCC Resource Pool,CC measurement event,and D2DCCIndicator to carry the CC assignment for D2D communication.When the UE which is in the cellular communication wants to establish D2D communication,this method can help the UE maintain cellular communication and D2D communication simultaneously.Besides,this thesis.Finally,this thesis has built a D2D system-level simulation platform and described the specific functions of this platform.