ASTR belongs to hierarchicalrouting protocol: it divides the whole network into many subareas logically through establishing subarea trees and each subarea is composed of a tree.
ASTR属于分级路由协议，通过建立分区树，在逻辑上将网络划分为多个分区，每个分区由一棵树组成。
2
As many routing protocols for wireless sensor network can't handle dynamic topological variation efficiently, a new hierarchicalrouting protocol (TVHRP) based on the shortest path is proposed.
Dynamic routing technology of circuit-switched network is critical to bring non-hierarchical network into full services and improve the grade of service eventually.