基于多目标最优化方法的垂直切换判决

当多个移动节点在蜂窝网与无线局域网共存的异构无线网络环境中移动时，综合考虑移动节点的电池寿命、基站与接入点的负载以及移动节点花费3个因素，运用多目标最优化方法进行切换判决，为所有移动节点选择合适的目标网络，使整个网络资源得到合理利用。仿真结果表明，相比传统最强信号优先方法，该方法在剩余电池寿命总和与负载平衡方面具有较好的性能，在花费总和方面性能较差。

Vertical Handover Decision Based on Multi-objective Optimization Method

When multiple mobile node moves in the environment with cellular networks and wireless local area networks, this paper jointly considers battery lifetime of mobile node, load of base station and access point and cost of mobile node. Multi-objective optimization method is used to handover decision for selecting suitable target networks by all the mobile nodes, and the whole network resource can be utilized reasonably. Simulation results indicate that this method outperforms in aspects of total remaining battery lifetime and load balance, but it performs worse in terms of total cost compared with traditional strongest signal first method.