The Performance Research Of Cooperative Relay Technology In LTE-advanced System

Cooperative relay technology is one of the key technology in future LTE-Advanced cellularnetwork, it will bring great benefits in cell communication. It can improve the system capacity,expand the area coverage, reduce the cost of network construction and provide hot cover indoor.Deployment of the relay stations brings many new features to the system. And at the same time,new problems also emerge. As it increases the number of nodes in the cell, the traditional single hopusers become multi-hop users, the traditional resource scheduling algorithms cannot be directlyapplied to cooperative relay network, thus make the wireless resource scheduling become more andmore complicated.This paper proposes a greed polling scheduling algorithm based on the pre-sort of spectrumefficiency which can be applied to LTE-Advanced cooperation relay system based on existingliteratures. This algorithm first considers the users’ channel quality condition before using thegreedy polling schedule, and can make the full use of the subcarrier resources, can realize themaximization of system throughput, the simulation results shows that although the algorithm has acertain loss in fairness between the users, but it has a good performance in the system capacity.This paper also puts forward an improved partial proportion fairness algorithm, this algorithmset a threshold value to relay users on account of the data buffers at relay station, and then classifiedthe users based on this, then processed the backlog users and hunger users by subcarrierredistribution and the regulation of data transmission rate. The simulation results are compared withseveral other algorithms. The results show that the algorithm has very good performance both insystem throughput and allocation fairness and rate fairness between users.The proposed algorithms have a good applicability in LTE-Advanced system, and have acertain practical value.