接着概述现有的平面、层次以及位置辅助路由协议或算法并做了必要的分析和比较；
Second existing routing protocols or algorithms are outlined and compared as the classification of plane, hierarchical as well as the position aided ones.
针对时延—带宽约束的层次路由问题，提出了楼梯法这一全新的拓扑聚集算法。
In order to deal with hierarchical routing with delay and bandwidth constraints, a new topology aggregation algorithm called stair method was proposed.
对层次性簇聚路由算法，提出了一种优化策略。
A more advanced strategy is proposed based on the hierarchy clustering routing algorithm.
对层次性簇聚路由算法，提出了一种优化策略。
A more advanced strategy is proposed based on the hierarchy clustering routing algorithm.
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