Research Of Resource Allocation In LTE-A Relay System

At present, LTE-Advanced system is a global wireless communications research focus, its purpose is to meet higher human demand for wireless communications within the next few years. Relay technology which is one of the most critical technology in LTE-Advanced system can improve the system capacity of the wireless communication network, provide higher data transfer rates and improve the cell edge. However, this technology brings a new and obvious problem:the new node is also a new interference source which forms a more complex network structure and interference structure. In order to effectively allocate time domain and frequency spectrum resource between base station and users, it is necessary for Relay system to work through extra subframe structure design and resource allocation.In this paper, author regard the best performance to fully realize the Relay network as the target, completes the construction of the Relay system simulation platform and makes preliminary analysis and evaluation of the influence of the different allocation of resources for small parts by analyzing the Relay application scenario, the resource allocation and scheduling algorithm from the basic principle and the network architecture of system Moreover, the main contents are as follows:according to the 3 GPP system plan and parameters, Channel model is established and author analyzed the large scale fading and LOS probability impact on access link and the backhaul link; the Relay system simulation platform is completed;According to different Relay allocation resources (such as LOS probability, SINR, the number of backhaul subframe, the number of RN deployed, etc.). Simultaneously the paper analyzes the Relay network performance in case 1 and case 3 scenarios and makes a conclusion. The simulation results show that:the introduction of the Relay can significantly improve the edge of the area coverage, system throughput and system outage rate. With the increase of RN number, the effects are apparent, but not the more the better, because in the small coverage, excessive RN will produce some unnecessary interference, affect system performance.