基于LQI的Zig Bee树型路由主动维护机制

LQI-based tree routing active maintenance mechanism for Zig Bee

Zig Bee树型路由中作为下一跳的父节点和子节点的信息储存在邻居表中,而目前邻居表的被动维护机制造成网络中父子关系对于变化剧烈的无线链路敏感性差,造成父子关系的维护不准确,增大网络中的丢包率。提出了一种基于链路质量指示值(LQI)的Zig Bee树型路由主动维护(LQI—TRAM)机制,并且引入电路中施密特触发器的思想增强链路质量判断的稳定性。在此机制下,节点主动检测与父子节点间的链路质量,在二者不适合做路由时主动断开连接,从而降低了丢包率。

As the next hop in Zig Bee tree routing,parent and child nodes are stored in neighbor table.Due to the passive maintenance mechanism of neighbor relationship table,parent-child relationships are insensitive to the changeable wireless link which cause inaccurate maintenance of parent-child relationship and packet loss rate is increased.A link quality indicator(LQI)-based tree routing active maintenance(LQI-TRAM)mechanism for Zig Bee is proposed and Schmitt trigger idea is introduced to the circuit to enhance stablity.A node can detect the quality of links between itself and father-son nodes,and break the links which are not fit for routing to avoid packet loss rate.