Implementation Of System Level Simulator And Research On Resource Allocation For Multicast/Broadcast Of The LTE Systems

With the rapid development of the information technologies, how to transmit the multimedia services with high efficiency and high quality on the broadcast/multicast mode in the mobile communication network has become a main research focus of the companies and standardization organizations. As the decision of 3GPP R8 specification, the E-MBMS standard whose transmission mode is the Multicast and broadcast Single Frequency Network, is introducted to adapt to the Long Term Evolution system. The transmission mode of MBSFN is an effective solution to some problems of MBMS, such as the irrational use of wireless resources, the instable reception and blind cover and so on. It has become an important technology to improve the performance of MBMS because it can improve the spectrum efficiency and coverage and enhance the reliability of the reception.This paper first gives an introduction of MBMS and its evolution and highlights the research of MBSFN technology.According to 3GPP standards and proposals on MBSFN, the paper introduces the design of system level simulation platform for the Multicast and Broadcast Single Frequency Network in LTE system and implements it by modifing the system level simulation platform for the LTE unicast system and increasing modules and functions of MBSFN then. The article gives the basic scenario of the system, the parameters setting and the channel model. Furthermore, the design process and the detailed design procedure of the platform are analyzed. Then the design methods and processes of the composed modules in the platform are described in detail. Finally, this paper focuses on the the research of the resource allocation technology on the MBSFN transmission mode. On the one hand, a novel MBSFN area resource allocation strategy is introduced. Simulation results show that the proposed strategy gains a preferable tradeoff between coverage and throughput in the case of no feedback. In the case of feedback, the proposed strategy obtains better performances of both throughput and coverage than the existing strategy when MBSFN areas have large sizes. On the other hand, the paper also introduces a adaptive resource allocation scheme between multicast and unicast services, it is able to allocate time slot resources adaptively based on the needs of multicast services, improve the resource utilization rate and ensure the requirement of the service transmission. All the conclusions were verified through the system level simulation.