Research On D2d Communication Resource Allocation Based On Multi-cell For LTE System

With the continuous development of mobile multimedia services,the data flow in the communication network is increasing explosively,resulting in the shortage of communication network resources,especially wireless spectrum resources.To solve this problem,D2 D technology came into being.As an important part of the evolving 5G communication,this technology has great advantages in improving spectrum utilization and system throughput,and it is also a research hotspot in the field of mobile communication.The resource sharing between the cellular user equipment(CUE)and the D2 D user equipment(DUE)in the communication causes certain co-channel interference between the communication links.Reasonable resource allocation can effectively reduce these interferences and improve system performance.Therefore,resource allocation is particularly important in D2 D communication for interference problems.In the multi-cell scenario of LTE system,a multi-cell resource allocation and power control algorithm based on DILA is proposed for the same-frequency interference problem between D2 D link and cellular link.The algorithm aims to maximize system throughput.Considering resource allocation and power control jointly,the number of multiplexed cellular users is calculated according to the D2 D user channel state to obtain the DILA.For the interval interference,a priority-based FFR strategy is adopted to obtain a multiplexing set.Then,the simulated annealing algorithm selects the cellular users from the set to determine the multiplexing relationship.The Lagrange multiplier algorithm is then used to allocate optimal transmission power for DUE and CUE.Finally,without limiting the number of D2 D user reusable resources,the dynamic allocation of resources is performed,and dynamic control of power is realized at the same time.In the end,the paper simulates the proposed resource allocation and power control scheme.Experimental results show that the proposed scheme is effective and correct,which effectively increases the overall capacity of the system,based on the quality of communication guaranteed by cellular users and achieves the goal of reducing co-channel interference in D2 D communication in a multi-cell scenario,realizing the dynamic allocation of resources.