Research On Selection And Scheduling Techniques In LTE-A CoMP System

With the further development of the fourth generation wireless communication tech To satisfy the growing demand for high data rate and quality of service in wireless systems and for the demand of 4G requirement, 3GPP(the 3rd Generation Partnership Project) has proposed the LTE-A system. In LTE-A system, OFDM makes all the subcarriers stay orthogonal to each other, so that the intra-cell interference is avoided. In order to mitigate inter-cell interference, coordinated multipoint(CoMP) transmission technique has been proposed as an important technology for LTE-A system. This paper mainly introduces the basic concepts and classification of CoMP, then the CoMP transmission schemes, feedback mechanisms, CoMP cell selection, CoMP UE scheduling,respectively. This article researchs on the technique of Coordinated Multi Point transmission in LTE-A are as follows:Firstly, considering the higher complexity of the existing CoMP cooperating set selection algorithm, the proposed program can improve the high complexity of system. The study includes the CoMP UE selection algorithm and CoMP cooperating set selection algorithm in CoMP. The simulation results show that the proposed scheme has improved the cell edge user spectral efficiency and cell average spectral efficiency and reduce the complexity of the system.Secondly, Research on the existing user scheduling scheme, user scheduling scheme is proposed to solve the fairness and lack of flexibility. The proposed scheme can improve user preference by optimizing the priority calculation way of CoMP users.Thirdly, In order to verify the system performance of the proposed program, the CoMP scheduling model has been established, which included CoMP cycle, CoMP resource negotiation and CoMP transmission module. Simulation results show that the proposed algorithm can improve the edge user spectrum efficiency, average cell spectral efficiency and the fairness of the user scheduling.Finally, this paper summarizes cooperating set selection algorithm and scheduling techniques in CoMP, prospected the CoMP system next research focus.