The Research On LTE Downlink Wireless Resources Scheduling And System Test

With the higher demand of telecommunication, wireless cellular network hugely changed in our modern life. When the thesis was prepared a year and a half ago, LTE was merely a project for the time. By now, LTE becomes a widely formal used commercial network, which will constantly with the conception of innovation and improvement. Nevertheless, it will finally reach the goal of communication which is no limit to time, place and means. This thesis focuses on the research and innovation of key technology of LTE and scheduling system.This thesis centered around the LTE downlink system, with the in-depth study of its resource scheduling and allocation mechanism. At first, by building up the LTE downlink system level simulation platform, including the link mapping model, the network topology, the channel fading model, the traffic model and the UE walking model, I analyze the key technology of LTE in order to realize how the ?three high‘, ?two low‘, and ?one flat‘ are achieved, study the MAC layer module of LTE simulation platform and research how the LTE system platform affect the resource allocation system. Moreover, I argue the RRM of LTE system, and research several traditional algorithms, such as the proportional fair scheduling algorithm, round robin scheduling algorithm and the maximum carrier to interference ratio scheduling algorithm in order to discuss each algorithm performance comparison and point their shortcomings out. Afterward, based on the mixed business of real-time and non-real-time traffic, I put forward my own innovative EMCM algorithm, which core idea is that under the guaranted premise of QoS standard, I merge two traffic in the same MCS together and transport by one single RB signal, while in the receiving terminal, UE classify the traffic of them own and decode it. And then with the comparison of new EMCM algorithm and traditional algorithms, I initial drow the conclusion that the EMCM algorithm may improve the system throughput and spectrum utilization rate, while the packet loss rate is in the system permissible range.Finally, in order to detect the LTE system platform and the EMCM algorithms, I do a system level test in view of Mobile test specification. Fitst of all, I set up the LTE equipment in ASB, including the antennas, UEs, eNodeBs, and other testing environment. Secondly, I configure the database parameters to meet the essential testing environment, such as IP configuration, cellphone number, frequency point, handover selection, IOT, and so on. After the end of the configuration environment, I do the system testing which record the key points: the throughput, bler, handover succeeded rate, latency. Last but not least, according to the testing record, the test results of the PF and EMCM fit to the previously simulation results.