Downlink Scheduling Algorithm And Allocation Of Resource Research In LTE-Advanced Relay

LTE-Advanced(LTE-A)is the evolution of LTE technology,which is based on the compatibility of LTE and introduces many new technologies.Where the relay technology can not only and the host base station cross the layout to get a greater coverage,but also and the host base station to repeat coverage to achieve greater system capacity.This paper mainly studies the scheduling module of LTE-A relay system.The characteristics of different scheduling algorithms and business volume change scenarios of relay are analyzed and combined with the protocol specification,the paper proposes an intelligent algorithm based on the adaptive capacity of buffer data.Through the verification of simulation platform,the algorithm can improve the throughput of the system under the same conditions,and reduce the packet loss rate.First,for the existing scheduling algorithm is only a simple priority ranking and can't be adjusted according to the current requirements of the system,the paper proposes a new algorithm based on the buffer data adaptive,applied to LTE-A relay downlink scheduling algorithm.Based on the modified maximum weighted delay first(M-LWDF)algorithm,the proposed algorithm is adjusted to its instantaneous rate fraction.In order to make the weight of instantaneous rate parameter follow the buffer data of change and the algorithm adaptive adjustment according to the requirements of system,the algorithm on the basis of the original instantaneous rate fraction increases the index factor that could be acquired by the quantization of buffer data.Second,in order to verify the performance of the scheduling algorithm and design a more reasonable scheduling algorithm,the paper designs a more optimized simulation system based on protocol.The simulation module includes four parts,which are the scheduling information,the priority calculation and the ranking,the radio resource allocation and scheduling information feedback.Third,the simulation results of original scheduling algorithm and the algorithm of paper design show that the proposed algorithm is not only good performance in business time delay,spectrum efficiency and fairness,but also improve the system throughput and reduce the packet loss rate to a certain extent,which is a good choice for LTE-A relay downlink.