Research On The Integration Of LTE-TDD And LTE-FDD

With the development of network technology,services and applications are becoming various,network resources tend to be saturated and high network load and network congestion problems emerge.Single network can no longer guarantee the good performance of subscriber services.In order to meet the requirement of users as well as possible,and considering the costs of development and deployment of new network and other factors,people think the network integration is the best way to solve these problems.Network integration is a major trend in next-generation wireless network.It aims to maintain services continuity across multiple networks and make use of the advantages of these networks so that these networks can work together and complement each other.Then users can choose among these networks through a multi-mode access terminal.Thus,a better network access environment mode can be established.Now LTE is one of the most widely used wireless communication system network in the world.Its high data transfer rates and the performance of supporting multimedia services earned a lot of users.LTE has two modes:LTE-FDD(Frequency Division Duplex,FDD)and LTE-TDD(Time Division Duplex,time division duplex).The difference between the two networks isn't big.So in order to avoid network overload and network congestion,improve the radio resource utilization and provide users with a better network experience,the solution of integrating the LTE-FDD and LTE-TDD has been studied in this paper.In this paper,the author present a network load balancing integration scheme based on gravitational search algorithm,which according to the characteristics of the two networks,allocating the symmetric and asymmetric traffic services to LTE-FDD and LTE-TDD network in order to achieve the load balancing of the two networks.Gravitational search algorithm is a highly efficient intelligent optimization algorithm and has a better search capability and good performance of solving nonlinear problems.In the proposed scheme,gravitational search algorithm is applied and we consider the load balancing from the access control.Firstly,set up the network model and constraints.Then,initialize the search space and obtain the fitness function according to the integration networks load rate so that the maximum entropy of load rate of the integration networks can be achieved.Thus,we can achieve a preventive load balancing solution and solve the overload,network congestion and other issues in an effective way.The author evaluated the proposed schemes via simulation.Simulation result demonstrates the superiority of the proposed schemes.LTE-FDD and LTE-TDD ensure the performance of the services in the network,load of the two networks has also been effectively balanced.