The Research of Optimization Algorithms of Vertical Handoff in Heterogeneous Network

It is heterogeneous wireless Networks (HWN) aggregation foundation for vertical handoff (VHO), and that is key characters of core technology for multi-network aggregation. The currently mechanism handoff trigger is analyzed, a best network selected (BNS) framework is designed, the parameters of network terminal and user terminal of effecting VHO algorithm, and which also include norm of capable parameters, classifying the user business and determining the weight of parameters of network according to different user Business are studied. An optimization algorithm of VHO with variable weights is proposed in mobile terminal. Weights of the parameters are variably adjusted according to different service of users, the algorithm is significant improvement compared with traditional methods to effectively improve the user´s satisfaction degree and the integration performance of the network.