Research And Application On Packet Scheduling Algorithms In Lte Downlink System

Future generation cellular networks are expected to provide ubiquitous broadband access to a continuously growing number of mobile users. In this context, LTE systems represent an important milestone towards the4G networks. LTE is the adoption of advanced Radio Resource Management procedures in order to increase the system performance up to the Shannon limit. Packet scheduling mechanisms, in particular, play a fundamental role, because they are responsible for choosing how to distribute radio resources among different nodes, taking into account channel condition and QoS requirements.After introducing the background knowledge of LTE and the network structure, the main function of LTE Radio Resource Management and the fundamental scheduling mechanism of LTE system are studied in this paper. The classification, scheduling principle and metrics of the classical packet scheduling algorithm are overviewed. Then, LTE system level simulation platform designed for the packet scheduling algorithm verification is described in detail, including its working procedure and function modules.Two improved algorithms are proposed in this dissertation. The first is packet scheduling algorithm supports video business, the second is the packet scheduling algorithm supports mixed service. The performance comparison of the different scheduling strategy is carried out through system level simulations. Comparing results of the improved and classical algorithms in throughput, packet lost rate, fairness and delay present in this paper. The two improved algorithms are proved advanced. The application scenarios of two improved algorithms are analysed in LTE network optimization.