无线传感器网络中，单一信道传输模式下数据吞吐率的受限和易受到干扰的缺陷影响了数据传输的可靠性，而多信道传输技术能有效地解决吞吐量受限和单一信道干扰问题。但是，多信道传输的特点使得多数单一信道路由协议在多信道的情况下无法获得满意的性能。本文采取三项措施，设计实现了多信道采集树路由协议：一是采用自适应的信标发送机制，二是采用Extra Expected Number of Transmission(eetx)作链路质量估计，三是通过跨层设计，同步路由层和MAC层邻居表信息的插入与删除等操作。实验室初步实验的结果表明，该协议具有网络的聚敛速度快、拓扑结构稳定等优点，可实现数据的可靠传输。

Single channel wireless sensor networks are known to be unreliable when the channel of choice is severely interfered. They also suffer from the low throughput problem when the network scale is large. While using multiple channels is a promising technique to solve these problems, the existing singlechannel based routing protocols are not readily applicable for multichannel scenarios due to the challenges brought forward by multichannel transmissions. In this paper, a tree routing protocol is proposed for multichannel WSNs based on the following ideas: First, beacon interval is adaptive to network topology; Second, link quality is estimated by the measure of beacondriven and datadriven Extra Expected Number of Transmission(EETX); Finally, the neighbor table insertion and removal process is synchronized across the MAC layer and routing layer to reduce the communication and power consumption overhead. This protocol is implemented on our testbed and the experimental results show that this protocol provides a fast convergence rate, a stable topology, and reliable data transmissions.