同时引入扫描门限和切换门限来保证切换决策的可靠性。
Otherwise, scan threshold and handoff threshold are introduced to make the handoff decision efficient and reliable.
并根据不同的优化目标给出了最优化的切换门限的求解方法。
The approach to obtain the optimized switching thresholds subjected to different constraints is also given.
数值结果表明，链状外地代理的分层移动IP方案适用于家乡切换门限值较小时的移动场景。
Numerical results show that the chained foreign agent hierarchical mobile IP scheme outperforms the other two under small home handoff threshold.
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