Resource Allocation For Spectrum Sharing In D2D Mode Based On 4G Network

Nowadays,short video live broadcast and other mobile terminal based services are prevalent,and the data flow in the communication network is explosive growth,which makes the bandwidth resources used to transmit data,especially the wireless network resources in short supply.D2D(device to device)can be used to solve the problem of network resource supply and demand.As an important reference technology of communication system,the advantages of D2D are reflected in spectrum utilization,system capacity,throughput and other indicators.During data transmission,the sharing of spectrum resources between D2D users and general users' devices will cause the same frequency interference.The effective integration of spectrum resources plays a very active role in minimizing interference,and also can greatly improve the system performance of the whole wireless communication network.Therefore,the reasonable allocation of resources is very important in D2D communication.Based on LTE(long term evolution)system,this paper studies the same frequency interference of D2D spectrum sharing in multiple cells.From two aspects of resource allocation and power control,this paper studies the spectrum sharing resource allocation strategy based on dynamic interference limited area(Dila)to maximize the system throughput The frequency interference level shall be controlled within a reasonable range.According to the channel state of D2D users,the total Dila value of other general wireless network users waiting for multiplexing is obtained;the multiplexing set is obtained by using the fractional frequency reuse(FFR)of priority;the multiplexing relationship with wireless network users is defined in the selected set by using the simulated annealing algorithm;the transmission power is increased by using the Lagrange multiplier algorithm.The final effect is not to change the reuse resources obtained by users such as D2D,but to complete the dynamic operation of power control and resource allocation.Finally,the simulation results show that the dynamic allocation of wireless resources and power control can be completed without affecting the original wireless network user communication experience,and the total capacity of the system can be increased to the maximum extent,so as to reduce the co frequency interference in this situation.