Mobility Management Technology Research In Heterogeneous Wireless Network

With the rapid development of wireless communication technology,myriads of radio access network technologies will provide users with long-term extensively heterogeneous wireless network environment in future.To give full play to the advantage of the wireless access network technology,and realize the complementary advantages and real integration of networks,the key lies in solving the issue of mobility management technology among networks.It is of great importance to study and analyze the heterogeneous wireless network in theoretical side.The paper extends the multidimensional markov system mode in regard to heterogeneous network environment with multi-network coexist based on queuing theory and markov model by means of the splitting traffic and non-splitting traffic corresponding to different state.This strategy enriches the content of the model and makes the system model suitable for more complex heterogeneous wireless network scenarios.Also,aiming at the problem of system calculation is too complicated,the paper proposes a series of optimization schemes such as states mapping,partitioning of matrix and using sparse matrix.These schemes can reduce the time and space complexity of the system effectively.Through the simulation of theoretical model and the algorithm,it concludes as follows:it is more accurate and effective to make network selection judgment in considering the performance of network and the current network load in a comprehensive way;in the complex network environment,a certain percentage of handoff are bad for the overall performance of the network system such as the system delay,but the influence on high load system is less than the low load system;the traffic flow splitting makes for improving the system performance,such as shortening the traffic time delay and improving the traffic handling ablities of system network etc;traffic flow splitting ratio will affect the performance of the system and heterogeneous wireless network system structures have the best traffic flow splitting ratios.The conclusion of the theory,to some extent,can guide the actual heterogeneous network system design and optimize the mobility management technologies.