研究结果：提出了长大隧道宜优先考虑采用以工程经验为主的隧道动态设计的原则建议。
Research results: the suggestion was proposed the dynamic design of tunnel mainly with engineering experience was adaptively applied in construction of large tunnel in priority.
定义了树节点类来动态地反映节点间的链接关系，采用深度优先算法，快速识别网络拓扑结构的变化。
The Type of tree node is defined to show the link relation between nodes, and the depth-first strategy is employed to identify topology structure.
该方案还采用了动态阈值的保护信道策略，保证了新呼叫和切换呼叫之间的优先级和公平性。
Guard Channel scheme based on dynamic thresholds is used in the scheme. It guarantees the priority and fairness between new calls and handoff calls.
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