基于Zigbee孤立节点快速入网机制研究

Study on the fast network mechanism of Zigbee isolated node

针对应急环境下,传统Zigbee孤立节点入网速度较慢的问题。本文分析孤立节点产生原因和入网机制,提出一种新的孤立节点快速入网策略:固定扫描单一信道、依据节点自身故障强制子节点退网、并根据地址分配空间以及RSSI强度优化传感器网络,以满足应急环境的通信要求。通过现场试验可得,当节点较少时,通常节省2.1 s左右的入网时间。仿真试验表明,当节点饱和度高于90%时,孤立点连接成功率提高10%,进而有效缩短孤立节点入网时间,并且可以有效优化路由节点网络深度,提高网络的健壮性。

To deal with the low efficiency of network access of traditional Zigbee isolated node under emergency,a new fast network access mechanism for isolated node is proposed in the paper on the basis of the analyses of the causes and network access process of isolated node： a single channel is constantly scanned;a child node is forced to retreated based on the malfunction of the node itself;the sensor network is optimized according to the allocation space of the address and RSSI intensity in order to meet the requirements of emergent communication. By field test,when the node is small,it usually saves 2.1 s or so. The simulation experiment shows that when the node saturation is higher than 90%,isolated point connection success rate increased by 10%,it can shorten the time of isolated nodes into the net,and effectively optimize the network routing node depth,to improve the robustness of the network.