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.
通过仿真，文中给出了VTBR算法与传统位置辅助路由协议的性能对比分析，对数据包传输成功率和平均路径长度这两个性能参数进行了评价。
The performance comparison between VTBR and traditional position based routing protocols shows that VTBR algorithm has a much higher packet delivery success rate and a shorter average path length.
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