Research On Scheduling Algorithms For Coordinated Multi-Point Transmission In Lte-A System

LTE-A(Long Term Evolution-Advanced) is a evolution project following the3G,its goal is to provide user communication experience of high data rate,low latency and guaranteed QoS. Coordinated multi-point transmission (CoMP) is the key technology for LTE-A to achieving seamless network and high-speed coverage. CoMP technology can solve the problem of system spectral efficiency of a single cell in the existing network and the problem of inter-cell interference and performance through cooperative transmission between multi-points. This paper mainly focus on the multi-service CoMP scheduling algorithm performance, while using simulation platform that proposed in this paper, simulated four representative scheduling algorithm’s CoMP performance and gain in scenarios of FTP, VoIP and mixture of these two based on simulation parameters that established in3GPP’s technical report,and then proposed an improvement solution of M-LWDF scheduling algorithms under multi-service CoMP,which is called RU-LWDF, then verified effectiveness of the solution through simulation. The main achievements can be summarized as follows:Summarized LTE-A CoMP related researchs and research status of3GPP and academia in multi-service CoMP, laid a foundation for the construction of multi-service CoMP simulation platform and multi-service CoMP scheduling research in this paper.According to the3GPP technical documentation, scientifically designed CoMP simulation platform for multi-service, based on original University of Vienna LTE open source simulation platform, added CoMP cooperative addressing, CoMP candidate cooperating cell selection, CoMP mode judgment and CoMP resource scheduling module. Also added some multi-service processing related parameters and HARQ module. This simulation platform provides a reliable verification platform for research of CoMP Scheduling performance for multi-service.According to3GPP CoMP simulation parameters, this paper simulated performance of the round-robin scheduler, proportional fair scheduler, the best CQI scheduler and M-LWDF scheduler before and after CoMP using system-level simulation platform under Full-buffer, VoIP, FTP and mixture of these two.And then proposed an improvement solution of M-LWDF scheduling algorithms under multi-service CoMP called RU-LWDF, then verified effectiveness of the solution through simulation.