Research On Resource Scheduling Strategy Of LTE-A Double Network

LTE-A(Long Time Evolution-Advanced) system, as a follow-up to the evolution of LTE system, put forward more stringent requirements in many aspects including system capacity, spectral efficiency and cell edge throughput. In order to meet the business needs of people of different rates, we introduce the concept of heterogeneous networks(HetNets)during the LTE-A standardization process.In this paper, the main object of this study is a double heterogeneous network systems consists of Femtocell and macrocell, we focus on the analysis of complex inter-cell interference problem, and study the resource scheduling algorithms to solve it in the double-heterogeneous network system. The cell resource scheduling algorithm in HetNets can effectively reduce the inter-cell interference while scheduling resources, and improve the QoS(Quality of Service) of the cell-edge users, in the premise of meeting the needs of users, reducing the total power consumption of HetNets. The main research work and contributions are as follows:First, thesis adopts the approach of "building a model- proposed algorithm- conduct simulation". Based on a double networking model of heterogeneous networks, we build an inner-and-outer layer system model(I-O model), establishing an interference scene between the femtocell and users, and presents a hierarchical scheduling resources-joint interference suppression algorithm. In the inner layer, we use time-frequency-domain resource scheduling scheme, in which time-domain interference coordination techniques use almost blank subframe programs to address the low throughput of the cell-edge users and lower coverage of edges problem; frequency-domain resources scheduling mainly determine the desired number of RB distributed for users, and on the system bandwidth adopt frequency domain scheduling algorithm for pre-service user in accordance with the appropriate resource allocation.Then, in the outer layer, we propose a resource allocation algorithm based on subchannel and power, we divide the channel resources into many multiple smallersub-channels, using the "preemptive first" principle to avoid channel conflict preemption.Adapting to part of the power control algorithm on the allocated sub-channel can reduce the loss and attenuation when data transmission, and determines the most efficient allocation of the spectrum, to ensure that the whole system can enhance the throughput.Use the schedule of "Spectrum Rule of Thirds" in the frequency spectrum resources to queue resources as a priority, and allocate these resources to cell edge users and cell central users, effectively suppressing inter-cell interference.Finally the paper builds a Het Nets system-level simulation platform based on MATLAB and a crosstalk interference scenarios of Het Nets, then make a simulation for proposed resource scheduling scheme, to verify system performance improvement.Simulation results have demonstrated that the proposed algorithm can effectively eliminate interference in within layers and different layers, and has reached good results in the spectral efficiency of cell-edge users. The overall system performance has been significantly improved.