Research On Key Technology Of Network Optimization For 5G Mobile Communication System

The next generation mobile communication network will be fully commercialized in 2020,the current 5G vision research has been completed and the relevant international organizations,including ITU,3GPP and so are actively promoting the 5G standard.The relevant communications companies have also proposed for some 5G mobile communication system Programs and a series of field tests.At the same time,the Internet of Thing(Io T)are greatly expanding the scope of mobile communications services,extending from human to human(H2H),mechine to mechine(M2M)and human to intelligent communication.So,Internet of Everything will be one of the main trends of the 5G mobile communication technology.IoT applications,such as smart home,car networking and mobile medical are widely used and different IoT application scenarios have different business characteristics and communication needs.For instance,massive IoT connections need the network to ensure a certain throughput performance.Under the future 5G mobile communication network architecture,in order to ensure the business needs of different IoT application scenarios,this paper carruies out some relevant network optimization research works.The detail researches are as follows:For the connection scenario of IoT group paging,NB-IoT technology is applied in the next generation mobile communication network,and the focus of network optimization is put on as far as possible ensuring the random access performance of IoT equipment.In this paper,we propose a random access optimization strategy for IoT group based on time slot scattering.Firstly,the mathematical model based on queuing theory is established for the connection scene of IoT group,and then the number of IoT devices scattered to the time slot in the initial state is deduced by the mathematical formula,so as to obtain the specific time slot scattering algorithm.At last,the simulation results show that the proposed scheme can guarantee the random access performance of IoT devices even thought the number of IoT devices increases.For IoT applications mixed connection scenarios which have specific functions,the focus of network optimization is placed on the random access performance of services that guarantee high latency sensitivity.For this reason,this paper proposes a random access optimization scheme based on preamble combination.The main idea is to use different preamble combinations to characterize the priorities of different services,which can avoid the shortcomings of static or semi-static preamble allocation schemes.In this paper,we give the concrete scheme of combining two preamble codes and derive the access performance formula of the corresponding different priority services.Through the system simulation,the proposed scheme can guarantee the low priority service throughput while ensuring high Priority service delay requirements.For the massive connecting IoT service,on the future 5G mobile communication system service customization platform,the focus of network optimization is put on improving the system resource utilization.Based on the IoT servicewith characteristic of small and huge number packets,this paper proposes the aggregation strategy and gives the specific packet aggregation logic.A resource allocation mechanism based on IoT traffic aggregation is proposed for cross-coverage area covered by multi-stations.Experimental results show that the aggregation module for IoT packet can effectively improve the system resources and improve the utilization rate of system resources.