关键词: 垂直切换, 终端能耗, 网络发现策略, 模糊逻辑

Abstract: For mobile terminal with limited power and terminal power factor is always ignored by existing vertical handoff mechanism, this paper proposes vertical handoff based on terminal energy consumption mechanism. In view of the network discovery stage, this paper puts forward an optimization algorithm of network discovery based on the terminal energy. In view of the handoff decision stage, the sampling points into the subsequent modules are reduced by prejudgment; then, the corresponding fuzzy logic method is designed for real-time and non-real-time businesses respectively; finally, real-time business using weighting factor completes the handoff, the handoff decision of non-real-time business is made based on difference threshold. Simulation results show that both network discovery time and interface activated number can be reduced in network discovery stage. Meanwhile, the call?drop?rate, the handoff number and the ping-pang effects can be reduced in the handoff decision stage. In conclusion, the effectiveness of the mechanism is demonstrated.

Key words: vertical handoff, terminal energy consumption, algorithm of network discovery, fuzzy logic