Research And Implementation Of Packet Scheduling And Interference Coordination Techniques In LTE System

With the development of wireless communication networks technology, as well as the complexity and diversity of Internet application, and widely access requirements of real-time data flow and mixed multimedia service, how to optimize the limited communication resources has been the problems of LTE and LTE-Advanced that need to be resolved urgently. This paper is aim to research a well-performed scheduling algorithm and inter-cell interference coordination technology in the LTE system.This paper first elaborated the basics of LTE System, and we briefly introduces the specification of LTE System, the new technology of LTE-Advanced System, LTE frame transmission, the transmission resource structure, resource block, and the differences of transmission resource structure between LDD and TDD. The paper also introduces the packet scheduling theory in LTE system and, classical packet scheduling algorithms and inter-cell interference coordination technology.In this paper, this paper put up with two packet scheduling algorithms to amid at multi-service scenarios, they are Hybrid Service Exponential Factor algorithm and multi-service QoS-based packet scheduling algorithm. They can distinguish between realtime and non-real time services business in the multi-service scenarios, and meet the demands of the different business’ s QoS. Simulation results show that the proposed algorithms reduces the users data drop rate and improves the system throughput considerably, while ensures the users’ fairness.In addition, this paper proposed fairness-based dynamic fractional frequency reuse algorithm and utility function-based adaptive fractional frequency feuse algorithm after studied and researched inter-cell interference coordination technology in the LTE system. Simulationresults show that the proposed frequency reuse schemes improve system throughput and mitigate the Co-Channel Interference(CCI) problems, while ensures the users’ fairness. And from the Simulation,we can find the proposed frequency reuse schemes can improves Cell-Edge User throughput significantly and dynamic adjust frequency spectrum distribution scheme.